memorysurfer.c

//
// Author: Lorenz Pullwitt <memorysurfer@lorenz-pullwitt.de>
// Copyright 2016-2024
//
// This file is part of MemorySurfer.
//
// MemorySurfer is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, you can find it here:
// https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
//

#include "imf/indexedmemoryfile.h"
#include "imf/sha1.h"
#ifdef NGINX_FCGI
#include <fcgi_stdio.h>
#define MACRO_TO_CALL_FCGI_ACCEPT FCGI_Accept()
#define IS_SERVER 1
#else
#define MACRO_TO_CALL_FCGI_ACCEPT 0
#define IS_SERVER 0
#endif
#include <stdio.h>
#include <malloc.h>
#include <string.h>
#include <assert.h>
#include <time.h>
#include <math.h>
#include <sys/stat.h>
#include <dirent.h>
#include <limits.h> // INT_MAX
#include <unistd.h> // unlink
#include <fcntl.h> // O_TRUNC / O_EXCL
#include <errno.h>

static const int32_t MSF_VERSION = 0x010001ec;

enum Error { E_OVERRN_1 = 0x7da6edc1, E_OVERRN_2 = 0x7da6edc2, E_OVERRN_3 = 0x7da6edc3, E_NEWLN_1 = 0x0495e6fd, E_NEWLN_2 = 0x0495e6fe, E_NEWLN_3 = 0x0495e6ff, E_UNESC = 0x012cf4b0, E_PXML = 0x0025968a, E_CRRPT = 0x0687f5d6, E_ASSRT_1 = 0x068e1507, E_HEX = 0x0002b106, E_POST = 0x003e3ed8, E_RPOFT = 0x115048c5, E_FIELD_1 = 0x0169002d, E_FIELD_2 = 0x0169002e, E_FIELD_3 = 0x0169002f, E_SCOPE_1 = 0x01c73201, E_SCOPE_2 = 0x01c73202, E_FIELD_4 = 0x01690030, E_FIELD_5 = 0x01690031, E_FIELD_6 = 0x01690032, E_FIELD_7 = 0x01690033, E_PARSE_1 = 0x01d087cf, E_HASH_1 = 0x001a255d, E_HASH_2 = 0x001a255e, E_PARSE_2 = 0x01d087d0, E_MISMA = 0x007a49be, E_SHA = 0x000025a8, E_PARSE_3 = 0x01d087d1, E_EXPOR_1 = 0x05e29399, E_EXPOR_2 = 0x05e2939a, E_EXPOR_3 = 0x05e2939b, E_GHTML_1 = 0x03f6667d, E_GHTML_2 = 0x03f6667e, E_GHTML_3 = 0x03f6667f, E_GHTML_4 = 0x03f66680, E_GHTML_5 = 0x03f66681, E_GHTML_6 = 0x03f66682, E_GENLRN_1 = 0x7d95d699, E_GENLRN_2 = 0x7d95d69a, E_GENLRN_3 = 0x7d95d69b, E_GENLRN_4 = 0x7d95d69c, E_GENLRN_5 = 0x7d95d69d, E_GENLRN_6 = 0x7d95d69e, E_GENLRN_7 = 0x7d95d69f, E_GENLRN_8 = 0x7d95d6a0, E_GENLRN_9 = 0x7d95d6a1, E_GHTML_7 = 0x03f66683, E_GHTML_8 = 0x03f66684, E_GHTML_9 = 0x03f66685, E_MALLOC_1 = 0x1e8e2971, E_MALLOC_2 = 0x1e8e2972, E_MALLOC_3 = 0x1e8e2973, E_ARG_1 = 0x0000da5d, E_ASSRT_2 = 0x0000da5d, E_DETECA = 0x099201b8, E_ARG_2 = 0x0000da5e, E_MALLOC_4 = 0x1e8e2974, E_MALLOC_5 = 0x1e8e2975, E_INIT = 0x003d20c0, E_CREATE = 0x311ccf88, E_ASSRT_3 = 0x068e1509, E_ASSRT_4 = 0x068e150a, E_CARD_1 = 0x000e0539, E_CARD_2 = 0x000e053a, E_CARD_3 = 0x000e053b, E_CARD_4 = 0x000e053c, E_DECK_1 = 0x00216467, E_DECK_2 = 0x00216468, E_DECK_3 = 0x00216469, E_DECK_4 = 0x0021646a, E_ASSRT_5 = 0x068e150b, E_UPLOAD_1 = 0x22b56c8f, E_MAX = 0x0002ad00, E_ARRANG_1 = 0x4052a587, E_MOVED = 0x0155e4ce, E_TOPOL = 0x03fbfe34, E_ARRANG_2 = 0x4052a588, E_CARD_5 = 0x000e053d, E_CARD_6 = 0x000e053e, E_CARD_7 = 0x000e053f, E_MCTR = 0x00384cd0, E_OVERFL_1 = 0x68bee46d, E_OVERFL_2 = 0x68bee46e, E_STATE = 0x01d1b8ba, E_SEND = 0x000d9828, E_LVL_1 = 0x00016d65, E_CARD_8 = 0x000e0540, E_CARD_9 = 0x000e0541 };
enum Field { F_UNKNOWN, F_FILE_TITLE, F_UPLOAD, F_ARRANGE, F_DECK_NAME, F_STYLE_TXT, F_MOVED_CAT, F_SCOPE, F_SEARCH_TXT, F_MATCH_CASE, F_IS_HTML, F_IS_UNLOCKED, F_DECK, F_CARD, F_MOV_CARD, F_LVL, F_RANK, F_Q, F_A, F_REVEAL_POS, F_TODO_MAIN, F_MCTR, F_MTIME, F_PASSWORD, F_NEW_PASSWORD, F_TOKEN, F_EVENT, F_PAGE, F_MODE, F_TIMEOUT };
enum Action { A_END, A_NONE, A_FILE, A_WARN_UPLOAD, A_CREATE, A_NEW, A_OPEN_DLG, A_FILELIST, A_OPEN, A_CHANGE_PASSWD, A_WRITE_PASSWD, A_READ_PASSWD, A_CHECK_PASSWORD, A_AUTH_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_LOAD_CARDLIST, A_LOAD_CARDLIST_OLD, A_GET_CARD, A_CHECK_RESUME, A_DECK_PATH, A_SLASH, A_VOID, A_FILE_EXTENSION, A_GATHER, A_UPLOAD, A_UPLOAD_REPORT, A_EXPORT, A_ASK_REMOVE, A_REMOVE, A_ASK_ERASE, A_ERASE, A_CLOSE, A_START_DECKS, A_DECKS_CREATE, A_SELECT_DEST_DECK, A_SELECT_SEND_DECK, A_SELECT_PROCEED_SEND, A_SELECT_ARRANGE, A_ENTER_NAME, A_STYLE_GO, A_CREATE_DECK, A_RENAME_DECK, A_READ_STYLE, A_STYLE_APPLY, A_ASK_DELETE_DECK, A_DELETE_DECK, A_TOGGLE, A_MOVE_DECK, A_SELECT_EDIT_CAT, A_EDIT, A_UPDATE_QA, A_UPDATE_HTML, A_UPDATE_DECK_FLAGS, A_SYNC, A_SYNC_OLD, A_INSERT, A_APPEND, A_ASK_DELETE_CARD, A_DELETE_CARD, A_PREVIOUS, A_NEXT, A_SCHEDULE, A_SET, A_CARD_ARRANGE, A_MOVE_CARD, A_SEND_CARD, A_SELECT_LEARN_CAT, A_SELECT_SEARCH_CAT, A_PREFERENCES, A_ABOUT, A_APPLY, A_SEARCH, A_PREVIEW, A_RANK, A_DETERMINE_CARD, A_SHOW, A_REVEAL, A_PROCEED, A_ASK_SUSPEND, A_SUSPEND, A_ASK_RESUME, A_RESUME, A_CHECK_FILE, A_LOGIN, A_HISTOGRAM, A_TABLE, A_RETRIEVE_MTIME, A_MTIME_TEST, A_TEST_CARD, A_TEST_CAT_SELECTED, A_TEST_CAT_VALID, A_TEST_DECK, A_TEST_ARRANGE, A_TEST_NAME };
enum Page { P_UNDEF = -1, P_START, P_FILE, P_PASSWORD, P_NEW, P_OPEN, P_UPLOAD, P_UPLOAD_REPORT, P_EXPORT, P_CAT_NAME, P_STYLE, P_SELECT_ARRANGE, P_SELECT_DEST_DECK, P_SELECT_DECK, P_EDIT, P_PREVIEW, P_SEARCH, P_PREFERENCES, P_ABOUT, P_LEARN, P_MSG, P_HISTOGRAM, P_TABLE };
enum Block { B_END, B_START_HTML, B_FORM_URLENCODED, B_FORM_MULTIPART, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_HIDDEN_MOV_CARD, B_CLOSE_DIV, B_START, B_FILE, B_PASSWORD, B_NEW, B_OPEN, B_UPLOAD, B_UPLOAD_REPORT, B_EXPORT, B_DECK_NAME, B_STYLE, B_SELECT_ARRANGE, B_SELECT_DEST_DECK, B_SELECT_DECK, B_EDIT, B_PREVIEW, B_SEARCH, B_PREFERENCES, B_ABOUT, B_LEARN, B_MSG, B_HISTOGRAM, B_TABLE };
enum Mode { M_NONE = -1, M_DEFAULT, M_MSG_START, M_MSG_UPLOAD, M_MSG_FILE, M_MSG_CARD, M_MSG_DECKS, M_MSG_SELECT_EDIT, M_MSG_SELECT_LEARN, M_MSG_SELECT_SEARCH, M_MSG_SUSPEND, M_MSG_RESUME, M_CHANGE_PASSWD, M_ASK, M_RATE, M_MSG_NO_CARD_ELIGIBLE, M_EDIT, M_LEARN, M_SEARCH, M_SEND, M_PROCEED_SEND, M_MOVE, M_CARD, M_MOVE_DECK, M_CREATE_DECK, M_START, M_END };
enum Sequence { S_FILE, S_START_DECKS, S_DECKS_CREATE, S_SELECT_MOVE_ARRANGE, S_DECK_NAME, S_STYLE, S_SELECT_EDIT_DECK, S_SELECT_LEARN_DECK, S_SELECT_SEARCH_DECK, S_PREFERENCES, S_ABOUT, S_APPLY, S_NEW, S_FILELIST, S_WARN_UPLOAD, S_UPLOAD, S_LOGIN, S_ENTER, S_CHANGE, S_START, S_START_SYNC_RANK, S_UPLOAD_REPORT, S_EXPORT, S_ASK_REMOVE, S_REMOVE, S_ASK_ERASE, S_ERASE, S_CLOSE, S_NONE, S_CREATE, S_GO_LOGIN, S_GO_CHANGE, S_DECKS_RENAME, S_RENAME_DECK, S_STYLE_APPLY, S_SELECT_DEST_CAT, S_MOVE_DECK, S_CREATE_DECK, S_ASK_DELETE_DECK, S_DELETE_DECK, S_TOGGLE, S_EDIT, S_EDIT_SYNC_RANK, S_EDIT_SYNC, S_INSERT, S_APPEND, S_ASK_DELETE_CARD, S_DELETE_CARD, S_PREVIOUS, S_NEXT, S_SCHEDULE, S_SET, S_CARD_ARRANGE, S_MOVE_CARD, S_EDITING_SEND, S_SEND_CARD, S_PROCEED_SEND_CARD, S_SEARCH, S_SEARCH_SYNCED, S_SEARCH_SYNC_QA, S_SEARCH_SYNC_RANK, S_PREVIEW_SYNC, S_PREVIEW, S_QUESTION_SYNCED, S_QUESTION_SYNC_QA, S_LEARN, S_QUESTION, S_QUESTION_RANK, S_SHOW, S_REVEAL, S_PROCEED_SYNC_QA, S_SELECT_PROCEED_SEND, S_ASK_SUSPEND, S_SUSPEND, S_ASK_RESUME, S_RESUME, S_HISTOGRAM, S_HISTOGRAM_SYNC_QA, S_TABLE, S_TABLE_SYNC_QA, S_TABLE_REFRESH, S_END };
enum Stage { T_NULL, T_URLENCODE_EQUALS, T_URLENCODE_AMP, T_BOUNDARY_INIT, T_CONTENT, T_NAME, T_NAME_QUOT, T_VALUE_START, T_VALUE_CRLFMINUSMINUS, T_FILENAME, T_FILENAME_QUOT, T_VALUE_XML, T_BOUNDARY_CHECK, T_EPILOGUE };
enum Scope { C_UNDEF = -1, C_CURRENT, C_CHECKED, C_ALL };

static enum Action action_seq[S_END+1][18] = {
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_FILELIST, A_FILE, A_END }, // S_FILE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_START_DECKS, A_END }, // S_START_DECKS
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_TEST_DECK, A_DECKS_CREATE, A_END }, // S_DECKS_CREATE
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_TEST_CAT_SELECTED, A_SELECT_ARRANGE, A_END }, // S_SELECT_MOVE_ARRANGE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_TEST_DECK, A_TEST_ARRANGE, A_ENTER_NAME, A_END }, // S_DECK_NAME
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_SYNC_OLD, A_READ_STYLE, A_STYLE_GO, A_END }, // S_STYLE
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_SELECT_EDIT_CAT, A_END }, // S_SELECT_EDIT_DECK
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_SELECT_LEARN_CAT, A_END }, // S_SELECT_LEARN_DECK
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_SELECT_SEARCH_CAT, A_END }, // S_SELECT_SEARCH_DECK
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_PREFERENCES, A_END }, // S_PREFERENCES
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_ABOUT, A_END }, // S_ABOUT
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_APPLY, A_GEN_TOK, A_SYNC, A_END }, // S_APPLY
  { A_FILELIST, A_NEW, A_END }, // S_NEW
  { A_FILELIST, A_OPEN_DLG, A_END }, // S_FILELIST
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_WARN_UPLOAD, A_END }, // S_WARN_UPLOAD
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_ERASE, A_UPLOAD, A_END }, // S_UPLOAD
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_PASSWD, A_GEN_TOK, A_NONE, A_END }, // S_LOGIN
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_CHECK_PASSWORD, A_CHANGE_PASSWD, A_WRITE_PASSWD, A_SYNC, A_GEN_TOK, A_NONE, A_END }, // S_ENTER
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_PASSWD, A_CHANGE_PASSWD, A_WRITE_PASSWD, A_SYNC, A_GEN_TOK, A_NONE, A_END }, // S_CHANGE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_NONE, A_END }, // S_START
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_RANK, A_SYNC_OLD, A_NONE, A_END }, // S_START_SYNC_RANK
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_UPLOAD_REPORT, A_SYNC_OLD, A_END }, // S_UPLOAD_REPORT
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_READ_STYLE, A_EXPORT, A_END }, // S_EXPORT
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_ASK_REMOVE, A_END }, // S_ASK_REMOVE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_REMOVE, A_FILELIST, A_CLOSE, A_END }, // S_REMOVE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_ASK_ERASE, A_END }, // S_ASK_ERASE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_ERASE, A_FILE, A_END }, // S_ERASE
  { A_FILELIST, A_CLOSE, A_END }, // S_CLOSE
  { A_NONE, A_END }, // S_NONE
  { A_SLASH, A_VOID, A_FILE_EXTENSION, A_GATHER, A_CREATE, A_LOGIN, A_END }, // S_CREATE
  { A_CHECK_FILE, A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_LOGIN, A_END }, // S_GO_LOGIN
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_LOGIN, A_END }, // S_GO_CHANGE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_TEST_DECK, A_ENTER_NAME, A_END }, // S_DECKS_RENAME
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_TEST_NAME, A_RENAME_DECK, A_SYNC, A_END }, // S_RENAME_DECK
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_READ_STYLE, A_STYLE_APPLY, A_SYNC, A_END }, // S_STYLE_APPLY
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_TEST_DECK, A_SELECT_DEST_DECK, A_END }, // S_SELECT_DEST_CAT
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_TEST_ARRANGE, A_MOVE_DECK, A_SYNC, A_END }, // S_MOVE_DECK
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_TEST_ARRANGE, A_TEST_NAME, A_CREATE_DECK, A_SYNC, A_END }, // S_CREATE_DECK
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_TEST_DECK, A_LOAD_CARDLIST, A_ASK_DELETE_DECK, A_END }, // S_ASK_DELETE_DECK
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_DELETE_DECK, A_SYNC, A_END }, // S_DELETE_DECK
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_TOGGLE, A_SYNC, A_END }, // S_TOGGLE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_EDIT, A_END }, // S_EDIT
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_TEST_DECK, A_LOAD_CARDLIST, A_RANK, A_SYNC_OLD, A_TEST_CARD, A_GET_CARD, A_EDIT, A_END }, // S_EDIT_SYNC_RANK
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_EDIT, A_SYNC_OLD, A_END }, // S_EDIT_SYNC
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_INSERT, A_SYNC, A_END }, // S_INSERT
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_APPEND, A_SYNC, A_END }, // S_APPEND
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_SYNC_OLD, A_ASK_DELETE_CARD, A_END }, // S_ASK_DELETE_CARD
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_DELETE_CARD, A_SYNC, A_END }, // S_DELETE_CARD
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_PREVIOUS, A_SYNC_OLD, A_END }, // S_PREVIOUS
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_NEXT, A_SYNC_OLD, A_END }, // S_NEXT
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_SCHEDULE, A_SYNC_OLD, A_END }, // S_SCHEDULE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_SET, A_SYNC_OLD, A_END }, // S_SET
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_SYNC_OLD, A_CARD_ARRANGE, A_END }, // S_CARD_ARRANGE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_MOVE_CARD, A_SYNC, A_END }, // S_MOVE_CARD
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_SYNC_OLD, A_SELECT_SEND_DECK, A_END }, // S_EDITING_SEND
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_SEND_CARD, A_SYNC, A_END }, // S_SEND_CARD
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_SEND_CARD, A_SYNC, A_DETERMINE_CARD, A_READ_STYLE, A_CHECK_RESUME, A_DECK_PATH, A_END }, // S_PROCEED_SEND_CARD
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_SEARCH, A_END }, // S_SEARCH
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_SYNC_OLD, A_SEARCH, A_END }, // S_SEARCH_SYNCED
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_SYNC_OLD, A_SEARCH, A_END }, // S_SEARCH_SYNC_QA
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_RANK, A_SYNC_OLD, A_SEARCH, A_END }, // S_SEARCH_SYNC_RANK
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_SYNC_OLD, A_PREVIEW, A_READ_STYLE, A_END }, // S_PREVIEW_SYNC
  { A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_LOAD_CARDLIST_OLD, A_TEST_CARD, A_PREVIEW, A_GET_CARD, A_READ_STYLE, A_END }, // S_PREVIEW
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_UPDATE_HTML, A_SYNC, A_DETERMINE_CARD, A_READ_STYLE, A_CHECK_RESUME, A_DECK_PATH, A_END }, // S_QUESTION_SYNCED
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_SYNC, A_DETERMINE_CARD, A_READ_STYLE, A_CHECK_RESUME, A_DECK_PATH, A_END }, // S_QUESTION_SYNC_QA
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_UPDATE_DECK_FLAGS, A_SYNC, A_DETERMINE_CARD, A_READ_STYLE, A_CHECK_RESUME, A_DECK_PATH, A_END }, // S_LEARN
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_DETERMINE_CARD, A_READ_STYLE, A_CHECK_RESUME, A_DECK_PATH, A_END }, // S_QUESTION
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RANK, A_SYNC, A_DETERMINE_CARD, A_READ_STYLE, A_CHECK_RESUME, A_DECK_PATH, A_END }, // S_QUESTION_RANK
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_SHOW, A_READ_STYLE, A_CHECK_RESUME, A_DECK_PATH, A_END }, // S_SHOW
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_MTIME_TEST, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_REVEAL, A_READ_STYLE, A_CHECK_RESUME, A_DECK_PATH, A_END }, // S_REVEAL
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_PROCEED, A_SYNC, A_DETERMINE_CARD, A_READ_STYLE, A_CHECK_RESUME, A_DECK_PATH, A_END }, // S_PROCEED_SYNC_QA
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_PROCEED, A_SYNC, A_SELECT_PROCEED_SEND, A_DECK_PATH, A_END }, // S_SELECT_PROCEED_SEND
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_SYNC, A_ASK_SUSPEND, A_END }, // S_ASK_SUSPEND
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_SUSPEND, A_SYNC, A_DETERMINE_CARD, A_READ_STYLE, A_CHECK_RESUME, A_DECK_PATH, A_END }, // S_SUSPEND
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_SYNC, A_ASK_RESUME, A_END }, // S_ASK_RESUME
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_RESUME, A_SYNC, A_DETERMINE_CARD, A_READ_STYLE, A_END }, // S_RESUME
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_LOAD_CARDLIST_OLD, A_HISTOGRAM, A_END }, // S_HISTOGRAM
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_SYNC_OLD, A_HISTOGRAM, A_END }, // S_HISTOGRAM_SYNC_QA
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_TEST_DECK, A_LOAD_CARDLIST, A_TABLE, A_END }, // S_TABLE
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_TEST_DECK, A_LOAD_CARDLIST, A_TEST_CARD, A_GET_CARD, A_UPDATE_QA, A_SYNC_OLD, A_TABLE, A_END }, // S_TABLE_SYNC_QA
  { A_SLASH, A_GATHER, A_OPEN, A_READ_PASSWD, A_AUTH_TOK, A_GEN_TOK, A_RETRIEVE_MTIME, A_LOAD_CARDLIST_OLD, A_RANK, A_TABLE, A_SYNC_OLD, A_END }, // S_TABLE_REFRESH
  { A_END } // S_END
};

static enum Block block_seq[P_TABLE+1][11] = {
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_START, B_END }, // P_START
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_FILE, B_END }, // P_FILE
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_PASSWORD, B_END }, // P_PASSWORD
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_NEW, B_END }, // P_NEW
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_OPEN, B_END }, // P_OPEN
  { B_START_HTML, B_FORM_MULTIPART, B_OPEN_DIV, B_CLOSE_DIV, B_UPLOAD, B_END }, // P_UPLOAD
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_UPLOAD_REPORT, B_END }, // P_UPLOAD_REPORT
  { B_EXPORT, B_END }, // P_EXPORT
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_DECK_NAME, B_END }, // P_CAT_NAME
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_STYLE, B_END }, // P_STYLE
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_HIDDEN_MOV_CARD, B_CLOSE_DIV, B_SELECT_ARRANGE, B_END }, // P_SELECT_ARRANGE
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_HIDDEN_MOV_CARD, B_CLOSE_DIV, B_SELECT_DEST_DECK, B_END }, // P_SELECT_DEST_DECK
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_SELECT_DECK, B_END }, // P_SELECT_DECK
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_HIDDEN_MOV_CARD, B_CLOSE_DIV, B_EDIT, B_END }, // P_EDIT
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_HIDDEN_MOV_CARD, B_CLOSE_DIV, B_PREVIEW, B_END }, // P_PREVIEW
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_CLOSE_DIV, B_SEARCH, B_END }, // P_SEARCH
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_PREFERENCES, B_END }, // P_PREFERENCES
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_ABOUT, B_END }, // P_ABOUT
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_LEARN, B_END }, // P_LEARN
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_MSG, B_END }, // P_MSG
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_HISTOGRAM, B_END }, // P_HISTOGRAM
  { B_START_HTML, B_FORM_URLENCODED, B_OPEN_DIV, B_HIDDEN_CAT, B_HIDDEN_ARRANGE, B_HIDDEN_CAT_NAME, B_HIDDEN_SEARCH_TXT, B_CLOSE_DIV, B_TABLE, B_END } // P_TABLE
};

static const char *DATA_PATH = "/var/www/memorysurfer";

static const char *ARRANGE[] = { "Before", "Below", "Behind" };
static const char *SCOPE[] = { "Current", "Checked", "All" };

struct StringArray {
  int sa_c; // count
  char *sa_d; // data
  int32_t sa_n;
};

#pragma pack(push)
#pragma pack(1)
struct Deck {
  int32_t cat_cli; // card list index
  char deck_x;
  char unused;
  int16_t n_sibling; // next
  int16_t n_child;
  char deck_slot_used;
  char deck_on;
};
struct Card {
  int64_t card_time;
  int32_t card_strength;
  int32_t card_qai; // question/answer index
  uint8_t card_state; // ----hsss '-' = unused, h = HTML / TXT, s = state
};
struct Timeout {
  uint8_t to_sec;
  uint16_t to_count;
};
struct Password {
  uint8_t pw_msg_digest[SHA1_HASH_SIZE];
  int8_t pw_flag;
  struct Timeout timeout;
  uint32_t version;
  int32_t style_sai; // string array index
  uint32_t mctr;
  int8_t rank;
};
#pragma pack(pop)

struct MemorySurfer {
  struct IndexedMemoryFile imf;
  char *imf_filename;
  struct StringArray deck_sa;
  struct StringArray style_sa;
  struct Deck *cat_t; // tree
  int deck_a; // allocated
  int16_t n_first;
  size_t deck_path_z;
  char *deck_path;
  int deck_i;
  int mov_deck_i; // moved
  int arrange;
  char *deck_name_str;
  char *style_txt;
  struct Card *card_l;
  int card_a;
  int card_i;
  int mov_card_i;
  int cards_nel; // n eligible
  struct StringArray card_sa;
  time_t timestamp;
  int lvl; // level
  int rank;
  char *search_txt;
  int8_t match_case;
  int8_t is_html;
  int8_t is_unlocked;
  int8_t search_dir;
  enum Scope scope;
  int8_t can_resume;
  char *password;
  char *new_password;
  struct Password passwd;
  char *deck_flags;
  size_t deck_flags_n;
};

static const int32_t SA_INDEX = 2; // StringArray
static const int32_t C_INDEX = 3; // Categories
static const int32_t PW_INDEX = 4; // Password

struct Multi {
  char *delim_str[2];
  size_t delim_len[2];
  ssize_t nread_del;
  char *post_lp; // lineptr
  size_t post_n;
  int post_wp; // write position
  int post_fp; // found position
};

struct CardList {
  struct Card *card_l;
  int card_a;
};

struct XML {
  char *p_lineptr; // parse
  struct CardList *cardlist_l;
  size_t n;
  int prev_cat_i;
  FILE *xml_stream;
};

struct IndentStr {
  char *str;
  size_t size;
  int indent_n;
};

struct WebMemorySurfer {
  struct MemorySurfer ms;
  enum Sequence seq;
  enum Page page;
  enum Page from_page;
  enum Mode mode;
  enum Mode saved_mode;
  int timeout;
  char *dbg_lp;
  size_t dbg_n;
  int dbg_wp;
  char *file_title_str;
  char **fl_v; // filelist vector
  int fl_c; // count
  struct StringArray qa_sa;
  int reveal_pos;
  int saved_reveal_pos;
  int sw_i;
  char *dyn_msg;
  const char *msg_header;
  const char *msg_static;
  char *msg_btn_main; // left
  char *msg_btn_alt; // right
  int todo_main;
  size_t html_n;
  char *html_lp;
  char *found_str;
  uint32_t mctr;
  int32_t mtime[2];
  int hist_bucket[100]; // histogram
  int hist_max;
  int lvl_bucket[2][21]; // 0 = total, 1 = eligible
  int count_bucket[4];
  int checked_decks;
  uint8_t tok_digest[SHA1_HASH_SIZE];
  char tok_str[41];
  struct IndentStr *inds;
  char *temp_filename;
  uint8_t *posted_message_digest;
  int card_n;
  int deck_n;
};

static int append_part(struct WebMemorySurfer *wms, struct Multi *mult)
{
  int e;
  int i;
  char ch;
  assert(mult->post_wp > 0);
  e = 0;
  if (wms->dbg_wp + mult->post_wp + 1 > wms->dbg_n) {
    wms->dbg_n = (wms->dbg_wp + mult->post_wp + 1 + 120) & 0xfffffff8;
    e = wms->dbg_n > INT32_MAX;
    if (e == 0) {
      wms->dbg_lp = realloc(wms->dbg_lp, wms->dbg_n);
      e = wms->dbg_lp == NULL;
    }
  }
  if (e == 0) {
    for (i = 0; i < mult->post_wp; i++) {
      ch = mult->post_lp[i];
      wms->dbg_lp[wms->dbg_wp++] = ch;
    }
    wms->dbg_lp[wms->dbg_wp] = '\0';
  }
  return e;
}

static int percent2c(char *str, size_t len)
{
  int e;
  int rp; // read pos
  int wp; // write pos
  char r_ch; // read char
  unsigned char w_ch; // write char
  static const char table[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
  int i;
  e = 0;
  rp = 0;
  wp = 0;
  while (rp < len && e == 0) {
    r_ch = str[rp];
    if (r_ch == '+') {
      str[wp] = ' ';
    } else if (r_ch == '%') {
      e = rp + 2 >= len ? E_OVERRN_1 : 0;
      if (e == 0) {
        if ((str[rp + 1] == '0') && (str[rp + 2] == 'D')) {
          e = rp + 3 >= len ? E_OVERRN_2 : 0;
          if (e == 0) {
            e = str[rp + 3] == '%' ? 0 : E_NEWLN_1;
            if (e == 0) {
              e = rp + 5 >= len ? E_OVERRN_3 : 0;
              if (e == 0) {
                e = str[rp + 4] == '0' && str[rp + 5] == 'A' ? 0 : E_NEWLN_2;
                if (e == 0) {
                  str[wp] = '\n';
                  rp += 5;
                }
              }
            }
          }
        } else {
          e = -1;
          rp++;
          r_ch = str[rp];
          for (i = 0; i < 16 && e != 0; i++) {
            if (r_ch == table[i]) {
              w_ch = i * 16;
              e = 0;
            }
          }
          if (e == 0) {
            e = -1;
            rp++;
            r_ch = str[rp];
            for (i = 0; i < 16 && e != 0; i++) {
              if (r_ch == table[i]) {
                w_ch |= i;
                e = 0;
              }
            }
            if (e == 0) {
              if (w_ch < 32) {
                if (w_ch == '\n') {
                  e = E_NEWLN_3;
                } else {
                  e = w_ch != '\t';
                }
              } else {
                e = w_ch == 127;
              }
            }
            if (e == 0) {
              str[wp] = w_ch;
            }
          }
        }
      }
    } else {
      str[wp] = str[rp];
    }
    rp++;
    wp++;
  }
  if (wp < len && e == 0) {
    str[wp] = '\0';
  }
  return e;
}

static int checked_i32add(size_t augend, size_t addend, int32_t *total)
{
  int e;
  e = augend > INT32_MAX;
  if (e == 0) {
    e = addend > INT32_MAX;
    if (e == 0) {
      e = INT32_MAX - augend < addend;
      if (e == 0)
        *total = augend + addend;
    }
  }
  return e;
}

static int sa_set(struct StringArray *sa, int16_t sa_i, char *sa_str)
{
  int e;
  char *sa_d;
  char ch;
  size_t len;
  int32_t sa_n;
  int pos_s; // size
  int i;
  int pos_w; // write
  int pos_r; // read
  int pos_n; // new
  int sa_c;
  assert(sa_str != NULL && sa_i >= 0);
  len = strlen(sa_str);
  e = checked_i32add(len, 1, &sa_n);
  if (e == 0) {
    pos_s = 0;
    for (i = 0; i < sa->sa_c && e == 0; i++) {
      if (i != sa_i) {
        do {
          e = checked_i32add(sa_n, 1, &sa_n);
          ch = sa->sa_d[pos_s++];
        } while (ch != '\0' && e == 0);
      } else {
        do {
          ch = sa->sa_d[pos_s++];
        } while (ch != '\0');
      }
    }
    if (e == 0) {
      sa_c = sa->sa_c;
      if (sa_i >= sa->sa_c) {
        e = checked_i32add(sa_n, sa_i - sa->sa_c, &sa_n);
        sa_c = sa_i + 1;
      }
    }
    if (e == 0) {
      sa_d = malloc(sa_n);
      e = sa_d == NULL;
      if (e == 0) {
        pos_w = 0;
        pos_r = 0;
        pos_n = 0;
        for (i = 0; i < sa_c; i++) {
          if (i != sa_i) {
            if (i < sa->sa_c) {
              do {
                ch = sa->sa_d[pos_r++];
                sa_d[pos_w++] = ch;
              } while (ch != '\0');
            } else {
              sa_d[pos_w++] = '\0';
            }
          } else {
            while (pos_n < len) {
              ch = sa_str[pos_n++];
              sa_d[pos_w++] = ch;
            }
            sa_d[pos_w++] = '\0';
            if (i < sa->sa_c) {
              do {
                ch = sa->sa_d[pos_r++];
              } while (ch != '\0');
            }
          }
        }
        assert(pos_w == sa_n);
        free(sa->sa_d);
        sa->sa_d = sa_d;
        sa->sa_n = sa_n;
        sa->sa_c = sa_c;
      }
    }
  }
  return e;
}

static int multi_delim(struct Multi *mult)
{
  int e;
  int i;
  int ch;
  char *post_lp;
  size_t post_n;
  int post_tp; // test position
  assert((mult->post_lp == NULL && mult->post_n == 0) || (mult->post_lp != NULL && mult->post_n > 0));
  for (i = 0; i < 2; i++) {
    if (mult->delim_str[i] != NULL) {
      mult->delim_len[i] = strlen(mult->delim_str[i]);
    } else {
      mult->delim_len[i] = INT_MAX;
    }
  }
  e = 0;
  mult->nread_del = -1;
  mult->post_wp = 0;
  mult->post_fp = -1;
  do {
    if ((size_t)mult->post_wp + 1 >= mult->post_n) {
      post_n = mult->post_wp + 128;
      e = post_n >= INT_MAX;
      if (e == 0) {
        post_lp = (char *)realloc(mult->post_lp, post_n);
        e = post_lp == NULL;
        if (e == 0) {
          mult->post_lp = post_lp;
          mult->post_n = post_n;
        }
      }
    }
    if (e == 0) {
      ch = fgetc(stdin);
      if (ch != EOF) {
        mult->post_lp[mult->post_wp] = ch;
        mult->post_wp++;
        for (i = 0; mult->post_fp == -1 && i < 2; i++) {
          post_tp = mult->post_wp - mult->delim_len[i];
          if (post_tp >= 0) {
            if (memcmp(mult->post_lp + post_tp, mult->delim_str[i], mult->delim_len[i]) == 0) {
              mult->post_fp = post_tp;
            }
          }
        }
      }
    }
  } while (ch != EOF && mult->post_fp == -1 && e == 0);
  mult->post_lp[mult->post_wp] = '\0';
  if (mult->post_wp > 0) {
    mult->nread_del = mult->post_wp;
  }
  return e;
}

enum Tag { TAG_ROOT, TAG_MEMORYSURFER, TAG_DECK, TAG_NAME, TAG_STYLE, TAG_CARD, TAG_TIME, TAG_STRENGTH, TAG_STATE, TAG_TYPE, TAG_QUESTION, TAG_ANSWER };

static int sa_length(struct StringArray *sa) {
  int pos_l; // length
  int i;
  pos_l = 0;
  for (i = 0; i < sa->sa_c; i++) {
    while (sa->sa_d[pos_l++] != '\0');
  }
  return pos_l;
}

static int xml_unescape(char *xml_str)
{
  int e;
  int rp;
  int wp;
  char ch;
  assert(xml_str != NULL);
  rp = 0;
  wp = 0;
  e = 0;
  do {
    ch = xml_str[rp++];
    if (ch == '&') {
      if (strncmp(xml_str + rp, "amp;", 4) == 0) {
        rp += 4;
        ch = '&';
      } else if (strncmp(xml_str + rp, "lt;", 3) == 0) {
        rp += 3;
        ch = '<';
      } else {
        ch = '\0';
        e = E_UNESC; // illegal ampersand during unescape detected
      }
    }
    xml_str[wp++] = ch;
  } while (ch != '\0' && e == 0);
  return e;
}

enum CardState {
  STATE_ALARM = 0,
  STATE_SCHEDULED,
  STATE_NEW,
  STATE_SUSPENDED,
  STATE_HTML = 0x08
};

static ssize_t dummy_getdelim(char **lineptr, size_t *n, int delimiter, FILE *fp)
{
  ssize_t result;
  size_t cur_len = 0;

  if (lineptr == NULL || n == NULL || fp == NULL)
    {
      errno = EINVAL;
      return -1;
    }

 // flockfile (fp);

  if (*lineptr == NULL || *n == 0)
    {
      char *new_lineptr;
      *n = 120;
      new_lineptr = (char *) realloc (*lineptr, *n);
      if (new_lineptr == NULL)
        {
 //         alloc_failed ();
          result = -1;
          goto unlock_return;
        }
      *lineptr = new_lineptr;
    }

  for (;;)
    {
      int i;

      i = fgetc(fp);
      if (i == EOF)
        {
          result = -1;
          break;
        }

      /* Make enough space for len+1 (for final NUL) bytes.  */
      if (cur_len + 1 >= *n)
        {
          size_t needed_max =
            SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;
          size_t needed = 2 * *n + 1;
          char *new_lineptr;

          if (needed_max < needed)
            needed = needed_max;
          if (cur_len + 1 >= needed)
            {
              result = -1;
              errno = EOVERFLOW;
              goto unlock_return;
            }

          new_lineptr = (char *) realloc (*lineptr, needed);
          if (new_lineptr == NULL)
            {
 //             alloc_failed ();
              result = -1;
              goto unlock_return;
            }

          *lineptr = new_lineptr;
          *n = needed;
        }

      (*lineptr)[cur_len] = i;
      cur_len++;

      if (i == delimiter)
        break;
    }
  (*lineptr)[cur_len] = '\0';
  result = cur_len ? cur_len : result;

 unlock_return:
 // funlockfile (fp); /* doesn't set errno */

  return result;
}

static int parse_xml(struct XML *xml, struct WebMemorySurfer *wms, enum Tag tag, int parent_cat_i) {
  int e;
  ssize_t nread;
  int deck_i;
  int card_i;
  char *str;
  int len;
  int i;
  int deck_a;
  size_t size;
  struct tm bd_time; // broken-down
  int a_n; // assignments
  time_t simple_time;
  int32_t index;
  int32_t data_size;
  char do_flag;
  char slash_f; // flag
  do_flag = 1;
  deck_i = -1;
  do {
    nread = dummy_getdelim(&xml->p_lineptr, &xml->n, '<', xml->xml_stream);
    e = nread <= 0;
    if (e == 0) {
      if (do_flag) {
        do_flag = 0;
        switch (tag) {
        case TAG_ROOT:
        case TAG_MEMORYSURFER:
          break;
        case TAG_DECK:
          deck_i = 0;
          while (deck_i < wms->ms.deck_a && wms->ms.cat_t[deck_i].deck_slot_used != 0)
            deck_i++;
          assert(deck_i <= INT16_MAX);
          if (deck_i == wms->ms.deck_a) {
            deck_a = wms->ms.deck_a + 7;
            size = sizeof(struct Deck) * deck_a;
            wms->ms.cat_t = realloc(wms->ms.cat_t, size);
            e = wms->ms.cat_t == NULL;
            if (e == 0) {
              size = sizeof(struct CardList) * deck_a;
              xml->cardlist_l = realloc(xml->cardlist_l, size);
              e = xml->cardlist_l == NULL;
            }
            if (e == 0) {
              for (i = wms->ms.deck_a; i < deck_a; i++) {
                wms->ms.cat_t[i].deck_slot_used = 0;
                xml->cardlist_l[i].card_l = NULL;
                xml->cardlist_l[i].card_a = 0;
              }
              wms->ms.deck_a = deck_a;
            }
          }
          if (e == 0) {
            if (xml->prev_cat_i != -1) {
              wms->ms.cat_t[xml->prev_cat_i].n_sibling = deck_i;
            } else if (parent_cat_i != -1) {
              wms->ms.cat_t[parent_cat_i].n_child = deck_i;
            }
            xml->prev_cat_i = -1;
            if (e == 0) {
              wms->ms.cat_t[deck_i].cat_cli = -1;
              wms->ms.cat_t[deck_i].deck_x = 1;
              wms->ms.cat_t[deck_i].n_sibling = -1;
              wms->ms.cat_t[deck_i].n_child = -1;
              wms->ms.cat_t[deck_i].deck_slot_used = 1;
              wms->ms.cat_t[deck_i].deck_on = 0;
            }
          }
          break;
        case TAG_NAME:
          str = xml->p_lineptr;
          str[nread - 1] = '\0';
          e = xml_unescape(str);
          if (e == 0) {
            e = sa_set(&wms->ms.deck_sa, parent_cat_i, str);
          }
          break;
        case TAG_STYLE:
          str = xml->p_lineptr;
          str[nread - 1] = '\0';
          e = xml_unescape(str);
          if (e == 0) {
            e = sa_set(&wms->ms.style_sa, parent_cat_i, str);
          }
          break;
        case TAG_CARD:
          assert(parent_cat_i >= 0 && xml->cardlist_l[parent_cat_i].card_a >= 0);
          xml->cardlist_l[parent_cat_i].card_a++;
          size = xml->cardlist_l[parent_cat_i].card_a * sizeof(struct Card);
          xml->cardlist_l[parent_cat_i].card_l = realloc(xml->cardlist_l[parent_cat_i].card_l, size);
          e = xml->cardlist_l[parent_cat_i].card_l == NULL;
          if (e == 0) {
            card_i = xml->cardlist_l[parent_cat_i].card_a - 1;
            xml->cardlist_l[parent_cat_i].card_l[card_i].card_time = 0;
            xml->cardlist_l[parent_cat_i].card_l[card_i].card_strength = 60;
            xml->cardlist_l[parent_cat_i].card_l[card_i].card_qai = -1;
            xml->cardlist_l[parent_cat_i].card_l[card_i].card_state = STATE_NEW;
          }
          break;
        case TAG_TIME:
          memset(&bd_time, 0, sizeof(bd_time));
          str = xml->p_lineptr;
          str[nread - 1] = '\0';
          a_n = sscanf(str, "%d-%d-%dT%d:%d:%d",
              &bd_time.tm_year, &bd_time.tm_mon, &bd_time.tm_mday,
              &bd_time.tm_hour, &bd_time.tm_min, &bd_time.tm_sec);
          e = a_n != 6;
          if (e == 0) {
            bd_time.tm_mon -= 1;
            bd_time.tm_year -= 1900;
            simple_time = timegm(&bd_time);
            e = simple_time == -1;
            if (e == 0) {
              card_i = xml->cardlist_l[parent_cat_i].card_a - 1;
              xml->cardlist_l[parent_cat_i].card_l[card_i].card_time = simple_time;
            }
          }
          break;
        case TAG_STRENGTH:
          str = xml->p_lineptr;
          str[nread - 1] = '\0';
          card_i = xml->cardlist_l[parent_cat_i].card_a - 1;
          a_n = sscanf(str, "%d", &xml->cardlist_l[parent_cat_i].card_l[card_i].card_strength);
          e = a_n != 1;
          break;
        case TAG_STATE:
          str = xml->p_lineptr;
          i = str[0] - '0';
          e = i > 3;
          if (e == 0) {
            card_i = xml->cardlist_l[parent_cat_i].card_a - 1;
            xml->cardlist_l[parent_cat_i].card_l[card_i].card_state = (xml->cardlist_l[parent_cat_i].card_l[card_i].card_state & 0x08) | i;
          }
          break;
        case TAG_TYPE:
          str = xml->p_lineptr;
          i = str[0] - '0';
          e = i > 1;
          if (e == 0) {
            i <<= 3;
            card_i = xml->cardlist_l[parent_cat_i].card_a - 1;
            xml->cardlist_l[parent_cat_i].card_l[card_i].card_state = (xml->cardlist_l[parent_cat_i].card_l[card_i].card_state & 0x07) | i;
          }
          break;
        case TAG_QUESTION:
          str = xml->p_lineptr;
          str[nread - 1] = '\0';
          e = xml_unescape(str);
          if (e == 0)
            e = sa_set(&wms->ms.card_sa, 0, str);
          break;
        case TAG_ANSWER:
          str = xml->p_lineptr;
          str[nread - 1] = '\0';
          e = xml_unescape(str);
          if (e == 0)
            e = sa_set(&wms->ms.card_sa, 1, str);
          break;
        }
      }
      if (e == 0) {
        nread = dummy_getdelim(&xml->p_lineptr, &xml->n, '>', xml->xml_stream);
        e = nread <= 0;
        if (e == 0) {
          str = xml->p_lineptr;
          len = nread - 1;
          slash_f = str[0] == '/';
          if (slash_f) {
            str++;
            len--;
          }
          switch (len) {
          case 12:
            e = memcmp(str, "memorysurfer", 12) != 0;
            if (e == 0) {
              if (slash_f == 0) {
                e = tag != TAG_ROOT;
                if (e == 0)
                  e = parse_xml(xml, wms, TAG_MEMORYSURFER, parent_cat_i);
              }
              else
                e = tag != TAG_MEMORYSURFER;
            }
            break;
          case 8:
            if (memcmp(str, "strength", 8) == 0) {
              if (slash_f == 0) {
                e = tag != TAG_CARD;
                if (e == 0) {
                  e = parse_xml(xml, wms, TAG_STRENGTH, parent_cat_i);
                }
              } else {
                e = tag != TAG_STRENGTH;
              }
            } else {
              e = memcmp(str, "question", 8) != 0;
              if (e == 0) {
                if (slash_f == 0) {
                  e = tag != TAG_CARD;
                  if (e == 0)
                    e = parse_xml(xml, wms, TAG_QUESTION, parent_cat_i);
                } else
                  e = tag != TAG_QUESTION;
              }
            }
            break;
          case 6:
            e = memcmp(str, "answer", 6) != 0;
            if (e == 0) {
              if (slash_f == 0) {
                e = tag != TAG_CARD;
                if (e == 0) {
                  e = parse_xml(xml, wms, TAG_ANSWER, parent_cat_i);
                }
              } else {
                e = tag != TAG_ANSWER;
              }
            }
            break;
          case 5:
            if (memcmp(str, "state", 5) == 0) {
              if (slash_f == 0) {
                e = tag != TAG_CARD;
                if (e == 0) {
                  e = parse_xml(xml, wms, TAG_STATE, parent_cat_i);
                }
              } else {
                e = tag != TAG_STATE;
              }
            } else {
              e = memcmp(str, "style", 5) != 0;
              if (e == 0) {
                if (slash_f == 0) {
                  e = tag != TAG_DECK;
                  if (e == 0) {
                    e = parse_xml(xml, wms, TAG_STYLE, deck_i);
                  }
                } else {
                  e = tag != TAG_STYLE;
                }
              }
            }
            break;
          case 4:
            if (memcmp(str, "card", 4) == 0) {
              if (slash_f == 0) {
                e = tag != TAG_DECK;
                if (e == 0)
                  e = parse_xml(xml, wms, TAG_CARD, deck_i);
              } else {
                e = tag != TAG_CARD;
                if (e == 0) {
                  e = imf_seek_unused(&wms->ms.imf, &index);
                  if (e == 0) {
                    data_size = sa_length(&wms->ms.card_sa);
                    e = imf_put(&wms->ms.imf, index, wms->ms.card_sa.sa_d, data_size);
                    if (e == 0) {
                      card_i = xml->cardlist_l[parent_cat_i].card_a - 1;
                      xml->cardlist_l[parent_cat_i].card_l[card_i].card_qai = index;
                      wms->card_n++;
                    }
                  }
                }
              }
            } else if (memcmp(str, "time", 4) == 0) {
              if (slash_f == 0) {
                e = tag != TAG_CARD;
                if (e == 0) {
                  e = parse_xml(xml, wms, TAG_TIME, parent_cat_i);
                }
              } else {
                e = tag != TAG_TIME;
              }
            } else if (memcmp(str, "type", 4) == 0) {
              if (slash_f == 0) {
                e = tag != TAG_CARD;
                if (e == 0) {
                  e = parse_xml(xml, wms, TAG_TYPE, parent_cat_i);
                }
              } else {
                e = tag != TAG_TYPE;
              }
            } else if (memcmp(str, "name", 4) == 0) {
              if (slash_f == 0) {
                e = tag != TAG_DECK;
                if (e == 0)
                  e = parse_xml(xml, wms, TAG_NAME, deck_i);
              } else
                e = tag != TAG_NAME;
            } else {
              e = memcmp(str, "deck", 4) != 0;
              if (e == 0) {
                if (slash_f == 0) {
                  e = tag != TAG_MEMORYSURFER && tag != TAG_DECK;
                  if (e == 0)
                    e = parse_xml(xml, wms, TAG_DECK, deck_i);
                } else {
                  e = tag != TAG_DECK;
                  if (e == 0) {
                    assert(deck_i >= 0);
                    e = imf_seek_unused(&wms->ms.imf, &index);
                    if (e == 0) {
                      assert(xml->cardlist_l[deck_i].card_a >= 0);
                      data_size = xml->cardlist_l[deck_i].card_a * sizeof(struct Card);
                      assert(xml->cardlist_l[deck_i].card_l != NULL || xml->cardlist_l[deck_i].card_a == 0);
                      e = imf_put(&wms->ms.imf, index, xml->cardlist_l[deck_i].card_l, data_size);
                      if (e == 0) {
                        wms->ms.cat_t[deck_i].cat_cli = index;
                        free(xml->cardlist_l[deck_i].card_l);
                        xml->cardlist_l[deck_i].card_l = NULL;
                        xml->cardlist_l[deck_i].card_a = 0;
                        wms->deck_n++;
                      }
                    }
                    xml->prev_cat_i = deck_i;
                  }
                }
              }
            }
            break;
          default:
            e = E_PXML; // tag length undefined
            break;
          }
        }
      }
    } else if (tag == TAG_ROOT && parent_cat_i == -1) {
      wms->msg_header = "No or Empty XML data";
      wms->msg_btn_main = "OK";
      wms->todo_main = S_WARN_UPLOAD;
      wms->page = P_MSG;
    }
  } while (slash_f == 0 && e == 0 && tag != TAG_ROOT);
  return e;
}

static int sa_load(struct StringArray *sa, struct IndexedMemoryFile *imf, int32_t index)
{
  int e;
  int32_t data_size;
  int pos_c; // count
  char *sa_d;
  data_size = imf_get_size(imf, index);
  e = 0;
  if (sa->sa_n < data_size) {
    sa_d = realloc(sa->sa_d, data_size);
    e = sa_d == NULL;
    if (e == 0) {
      sa->sa_d = sa_d;
      sa->sa_n = data_size;
    }
  }
  if (e == 0) {
    e = imf_get(imf, index, sa->sa_d);
    if (e == 0) {
      sa->sa_c = 0;
      pos_c = 0;
      while (pos_c < data_size) {
        sa->sa_c += !sa->sa_d[pos_c++];
      }
    }
  }
  return e;
}

static int ms_open(struct MemorySurfer *ms)
{
  int e;
  int i;
  int32_t data_size;
  int16_t n_prev;
  e = ms->imf_filename == NULL || ms->cat_t != NULL || ms->deck_a != 0 || ms->n_first != -1 ? E_ASSRT_1 : 0;
  if (e == 0) {
    e = imf_open(&ms->imf, ms->imf_filename);
    if (e == 0) {
      e = sa_load(&ms->deck_sa, &ms->imf, SA_INDEX);
      if (e == 0) {
        data_size = imf_get_size(&ms->imf, C_INDEX);
        assert(ms->cat_t == NULL);
        if (data_size > 0) {
          ms->cat_t = malloc(data_size);
          e = ms->cat_t == NULL;
        }
        if (e == 0) {
          assert(ms->deck_a == 0);
          ms->deck_a = data_size / sizeof(struct Deck);
          e = imf_get(&ms->imf, C_INDEX, ms->cat_t);
          if (e == 0) {
            do {
              n_prev = -1;
              for (i = 0; i < ms->deck_a && n_prev == -1; i++)
                if (ms->cat_t[i].deck_slot_used != 0)
                  if (ms->cat_t[i].n_sibling == ms->n_first || ms->cat_t[i].n_child == ms->n_first)
                    n_prev = i;
              if (n_prev != -1) {
                e = n_prev == ms->n_first;
                if (e == 0) {
                  ms->n_first = n_prev;
                } else {
                  e = E_CRRPT; // decks hierarchy (is) corrupted
                }
              }
            }
            while (n_prev != -1 && e == 0);
          }
        }
      }
    }
  }
  return e;
}

static int scan_hex(uint8_t *data, char *str, size_t count)
{
  int e;
  int i;
  char ch;
  int nibble[2];
  e = 0;
  while (count-- && e == 0) {
    i = 2;
    while (i--) {
      ch = str[count * 2 + i];
      if (ch >= 'a' && ch <= 'f') {
        nibble[i] = ch - 'a' + 10;
      } else if (ch >= '0' && ch <= '9') {
        nibble[i] = ch - '0';
      } else {
        e = E_HEX;
      }
    }
    data[count] = nibble[0] << 4 | nibble[1];
  }
  return e;
}

struct Parse {
  enum Field field;
};

static int determine_field(struct Multi *mult, struct Parse *parse)
{
  int e;
  e = mult->post_fp <= 0;
  if (e == 0) {
    switch (mult->post_fp) {
    case 1:
      if (memcmp(mult->post_lp, "q", 1) == 0) {
        parse->field = F_Q;
      } else {
        e = memcmp(mult->post_lp, "a", 1) != 0;
        if (e == 0) {
          parse->field = F_A;
        }
      }
      break;
    case 3:
      e = memcmp(mult->post_lp, "lvl", 3) != 0;
      if (e == 0) {
        parse->field = F_LVL;
      }
      break;
    case 4:
      if (memcmp(mult->post_lp, "deck", 4) == 0) {
        parse->field = F_DECK;
      } else if (memcmp(mult->post_lp, "page", 4) == 0) {
        parse->field = F_PAGE;
      } else if (memcmp(mult->post_lp, "card", 4) == 0) {
        parse->field = F_CARD;
      } else if (memcmp(mult->post_lp, "mode", 4) == 0) {
        parse->field = F_MODE;
      } else if (memcmp(mult->post_lp, "mctr", 4) == 0) {
        parse->field = F_MCTR;
      } else {
        e = memcmp(mult->post_lp, "rank", 4) != 0;
        if (e == 0) {
          parse->field = F_RANK;
        }
      }
      break;
    case 5:
      if (memcmp(mult->post_lp, "event", 5) == 0) {
        parse->field = F_EVENT;
      } else if (memcmp(mult->post_lp, "token", 5) == 0) {
        parse->field = F_TOKEN;
      } else if (memcmp(mult->post_lp, "scope", 5) == 0) {
        parse->field = F_SCOPE;
      } else {
        e = memcmp(mult->post_lp, "mtime", 5) != 0;
        if (e == 0) {
          parse->field = F_MTIME;
        }
      }
      break;
    case 6:
      e = memcmp(mult->post_lp, "upload", 6) != 0;
      if (e == 0) {
        parse->field = F_UPLOAD;
      }
      break;
    case 7:
      if (memcmp(mult->post_lp, "is-html", 7) == 0) {
        parse->field = F_IS_HTML;
      } else if (memcmp(mult->post_lp, "arrange", 7) == 0) {
        parse->field = F_ARRANGE;
      } else {
        e = memcmp(mult->post_lp, "timeout", 7) != 0;
        if (e == 0) {
          parse->field = F_TIMEOUT;
        }
      }
      break;
    case 8:
      if (memcmp(mult->post_lp, "mov-card", 8) == 0) {
        parse->field = F_MOV_CARD;
      } else if (memcmp(mult->post_lp, "mov-deck", 8) == 0) {
        parse->field = F_MOVED_CAT;
      } else {
        e = memcmp(mult->post_lp, "password", 8) != 0;
        if (e == 0) {
          parse->field = F_PASSWORD;
        }
      }
      break;
    case 9:
      if (memcmp(mult->post_lp, "deck-name", 9) == 0) {
        parse->field = F_DECK_NAME;
      } else if (memcmp(mult->post_lp, "style-txt", 9) == 0) {
        parse->field = F_STYLE_TXT;
      } else {
        e = memcmp(mult->post_lp, "todo_main", 9) != 0;
        if (e == 0) {
          parse->field = F_TODO_MAIN;
        }
      }
      break;
    case 10:
      if (memcmp(mult->post_lp, "file-title", 10) == 0) {
        parse->field = F_FILE_TITLE;
      } else if (memcmp(mult->post_lp, "search-txt", 10) == 0) {
        parse->field = F_SEARCH_TXT;
      } else if (memcmp(mult->post_lp, "match-case", 10) == 0) {
        parse->field = F_MATCH_CASE;
      } else {
        e = memcmp(mult->post_lp, "reveal-pos", 10) != 0;
        if (e == 0) {
          parse->field = F_REVEAL_POS;
        }
      }
      break;
    case 11:
      e = memcmp(mult->post_lp, "is-unlocked", 11) != 0;
      if (e == 0)
        parse->field = F_IS_UNLOCKED;
      break;
    case 12:
      e = memcmp(mult->post_lp, "new-password", 12) != 0;
      if (e == 0) {
        parse->field = F_NEW_PASSWORD;
      }
      break;
    default:
      e = E_POST; // malformed form data
      break;
    }
  }
  return e;
}

static int parse_field(struct WebMemorySurfer *wms, struct Multi *mult, struct Parse *parse)
{
  int e;
  int a_n; // assignments
  int consumed_n;
  int value;
  size_t size;
  int i;
  e = 0;
  switch (parse->field) {
  case F_FILE_TITLE:
    e = wms->file_title_str != NULL ? E_RPOFT : 0; // repeated parse of file title
    if (e == 0) {
      wms->file_title_str = malloc(mult->post_wp);
      e = wms->file_title_str == NULL;
      if (e == 0) {
        assert(mult->post_lp[mult->post_fp] == '\0');
        memcpy(wms->file_title_str, mult->post_lp, mult->post_wp);
        e = percent2c(wms->file_title_str, mult->post_fp);
      }
    }
    break;
  case F_ARRANGE:
    assert(wms->ms.arrange == -1);
    a_n = sscanf(mult->post_lp, "%d", &wms->ms.arrange);
    assert(wms->ms.arrange >= 0 && wms->ms.arrange <= 2);
    e = a_n != 1;
    break;
  case F_DECK_NAME:
    e = wms->ms.deck_name_str != NULL ? E_FIELD_1 : 0;
    if (e == 0) {
      wms->ms.deck_name_str = malloc(mult->post_wp);
      e = wms->ms.deck_name_str == NULL ? E_FIELD_2 : 0;
      if (e == 0) {
        assert(mult->post_lp[mult->post_fp] == '\0');
        memcpy(wms->ms.deck_name_str, mult->post_lp, mult->post_wp);
        e = percent2c(wms->ms.deck_name_str, mult->post_fp) ? E_FIELD_3 : 0;
      }
    }
    break;
  case F_STYLE_TXT:
    e = wms->ms.style_txt != NULL;
    if (e == 0) {
      wms->ms.style_txt = malloc(mult->post_wp);
      e = wms->ms.style_txt == NULL;
      if (e == 0) {
        assert(mult->post_lp[mult->post_fp] == '\0');
        memcpy(wms->ms.style_txt, mult->post_lp, mult->post_wp);
        e = percent2c(wms->ms.style_txt, mult->post_fp);
      }
    }
    break;
  case F_MOVED_CAT:
    assert(wms->ms.mov_deck_i == -1);
    a_n = sscanf(mult->post_lp, "%d", &wms->ms.mov_deck_i);
    e = a_n != 1;
    break;
  case F_SCOPE:
    e = wms->ms.scope != C_UNDEF ? E_SCOPE_1 : 0;
    if (e == 0) {
      a_n = sscanf(mult->post_lp, "%d%n", &wms->ms.scope, &consumed_n);
      e = a_n != 1 || consumed_n != mult->post_fp || wms->ms.scope < C_CURRENT || wms->ms.scope > C_ALL ? E_SCOPE_2 : 0;
    }
    break;
  case F_SEARCH_TXT:
    e = wms->ms.search_txt != NULL;
    if (e == 0) {
      wms->ms.search_txt = malloc(mult->post_wp);
      e = wms->ms.search_txt == NULL;
      if (e == 0) {
        assert(mult->post_lp[mult->post_fp] == '\0');
        memcpy(wms->ms.search_txt, mult->post_lp, mult->post_wp);
        e = percent2c(wms->ms.search_txt, mult->post_fp);
      }
    }
    break;
  case F_MATCH_CASE:
    e = wms->ms.match_case != -1 || mult->post_fp != 2;
    if (e == 0) {
      e = memcmp(mult->post_lp, "on", 2) != 0;
      if (e == 0) {
        wms->ms.match_case = 1;
      }
    }
    break;
  case F_IS_HTML:
    e = wms->ms.is_html != -1 || mult->post_fp != 2;
    if (e == 0) {
      e = memcmp(mult->post_lp, "on", 2) != 0;
      if (e == 0) {
        wms->ms.is_html = 1;
      }
    }
    break;
  case F_IS_UNLOCKED:
    e = wms->ms.is_unlocked != -1 || mult->post_fp != 2;
    if (e == 0) {
      e = memcmp(mult->post_lp, "on", 2) != 0;
      if (e == 0) {
        wms->ms.is_unlocked = 1;
      }
    }
    break;
  case F_DECK:
    a_n = sscanf(mult->post_lp, "%d%n", &value, &consumed_n);
    size = DATA_SIZE_MAX / sizeof(struct Deck);
    e = a_n != 1 || consumed_n != mult->post_fp || value < 0 || value >= size;
    if (e == 0) {
      size = value + 1;
      if (size > wms->ms.deck_flags_n) {
        wms->ms.deck_flags = realloc(wms->ms.deck_flags, size);
        e = wms->ms.deck_flags == NULL;
        if (e == 0) {
          for (i = wms->ms.deck_flags_n; i < size; i++) {
            wms->ms.deck_flags[i] = 0;
          }
          wms->ms.deck_flags_n = size;
        }
      }
      if (e == 0) {
        wms->ms.deck_flags[value] = 1;
      }
    }
    break;
  case F_CARD:
    assert(wms->ms.card_i == -1);
    a_n = sscanf(mult->post_lp, "%d", &wms->ms.card_i);
    e = a_n != 1;
    break;
  case F_MOV_CARD:
    assert(wms->ms.mov_card_i == -1);
    a_n = sscanf(mult->post_lp, "%d", &wms->ms.mov_card_i);
    e = a_n != 1;
    break;
  case F_LVL:
    assert(wms->ms.lvl == -1);
    a_n = sscanf(mult->post_lp, "%d", &wms->ms.lvl);
    e = a_n != 1;
    if (e == 0) {
      e = wms->ms.lvl < 0 || wms->ms.lvl >= 21;
      if (e != 0) {
        e = E_FIELD_4; // lvl assert (failed)
      }
    }
    break;
  case F_RANK:
    e = wms->ms.rank != -1;
    if (e == 0) {
      a_n = sscanf(mult->post_lp, "%d%n", &wms->ms.rank, &consumed_n);
      e = a_n != 1 || consumed_n != mult->post_fp || wms->ms.rank < 0 || wms->ms.rank > 20;
    }
    break;
  case F_Q:
    assert(mult->post_lp[mult->post_fp] == '\0');
    e = percent2c(mult->post_lp, mult->post_fp);
    if (e == 0) {
      e = sa_set(&wms->qa_sa, 0, mult->post_lp);
    }
    break;
  case F_A:
    assert(mult->post_lp[mult->post_fp] == '\0');
    e = percent2c(mult->post_lp, mult->post_fp);
    if (e == 0) {
      e = sa_set(&wms->qa_sa, 1, mult->post_lp);
    }
    break;
  case F_REVEAL_POS:
    e = wms->saved_reveal_pos != -1;
    if (e == 0) {
      a_n = sscanf(mult->post_lp, "%d", &wms->saved_reveal_pos);
      e = a_n != 1 || wms->saved_reveal_pos < 0;
    }
    if (e == 1) {
      e = E_FIELD_5; // reveal-pos assert (failed)
      wms->saved_reveal_pos = -1;
    }
    break;
  case F_TODO_MAIN:
    assert(wms->todo_main == -1);
    a_n = sscanf(mult->post_lp, "%d", &wms->todo_main);
    e = a_n != 1;
    assert(wms->todo_main >= S_FILE && wms->todo_main <= S_END);
    break;
  case F_MCTR:
    a_n = sscanf(mult->post_lp, "%u%n", &wms->mctr, &consumed_n);
    e = a_n != 1 || consumed_n != mult->post_fp;
    break;
  case F_MTIME:
    e = mult->post_fp != 16;
    if (e == 0) {
      assert(wms->mtime[0] == -1 && wms->mtime[1] == -1);
      a_n = sscanf(mult->post_lp, "%8x%8x%n", &wms->mtime[1], &wms->mtime[0], &consumed_n);
      e = a_n != 2 || consumed_n != 16;
      if (e == 0) {
        assert(wms->mtime[0] >= 0 && wms->mtime[1] >= 0);
      }
    }
    break;
  case F_PASSWORD:
    assert(wms->ms.password == NULL);
    wms->ms.password = malloc(mult->post_wp);
    e = wms->ms.password == NULL;
    if (e == 0) {
      assert(mult->post_lp[mult->post_fp] == '\0');
      memcpy(wms->ms.password, mult->post_lp, mult->post_wp);
      e = percent2c(wms->ms.password, mult->post_fp);
    }
    break;
  case F_NEW_PASSWORD:
    assert(wms->ms.new_password == NULL);
    wms->ms.new_password = malloc(mult->post_wp);
    e = wms->ms.new_password == NULL;
    if (e == 0) {
      assert(mult->post_lp[mult->post_fp] == '\0');
      memcpy(wms->ms.new_password, mult->post_lp, mult->post_wp);
      e = percent2c(wms->ms.new_password, mult->post_fp);
    }
    break;
  case F_TOKEN:
    e = mult->post_fp != 40;
    if (e == 0) {
      e = scan_hex(wms->tok_digest, mult->post_lp, SHA1_HASH_SIZE);
    }
    break;
  case F_EVENT:
    switch (mult->post_fp) {
    case 3:
      if (memcmp(mult->post_lp, "New", 3) == 0) {
        wms->seq = S_NEW;
      } else {
        e = memcmp(mult->post_lp, "Set", 3) != 0;
        if (e == 0) {
          wms->seq = S_SET;
        }
      }
      break;
    case 4:
      if (memcmp(mult->post_lp, "Show", 4) == 0) {
        wms->seq = S_SHOW;
      } else if (memcmp(mult->post_lp, "Stop", 4) == 0) {
        if (wms->from_page == P_LEARN) {
          wms->seq = S_SELECT_LEARN_DECK;
        } else if (wms->from_page == P_SEARCH) {
          wms->seq = S_SELECT_SEARCH_DECK;
        } else if (wms->from_page == P_SELECT_ARRANGE) {
          if (wms->saved_mode == M_CARD) {
            wms->seq = S_EDIT;
          } else {
            if (wms->saved_mode == M_MOVE_DECK) {
              wms->ms.deck_i = wms->ms.mov_deck_i;
              wms->ms.mov_deck_i = -1;
            } else {
              e = wms->saved_mode != M_CREATE_DECK;
            }
            if (e == 0) {
              wms->seq = S_START_DECKS;
            }
          }
        } else if (wms->from_page == P_SELECT_DEST_DECK) {
          if (wms->saved_mode == M_SEND) {
            wms->ms.deck_i = wms->ms.mov_deck_i;
            wms->ms.card_i = wms->ms.mov_card_i;
            wms->seq = S_EDIT;
          } else if (wms->saved_mode == M_PROCEED_SEND) {
            wms->ms.deck_i = wms->ms.mov_deck_i;
            wms->ms.card_i = wms->ms.mov_card_i;
            wms->seq = S_QUESTION;
          } else {
            e = wms->saved_mode != M_MOVE;
            if (e == 0) {
              wms->ms.deck_i = wms->ms.mov_deck_i;
              wms->ms.mov_deck_i = -1;
              wms->seq = S_START_DECKS;
            }
          }
        } else if (wms->from_page == P_CAT_NAME) {
          wms->seq = S_START_DECKS;
        } else if (wms->from_page == P_STYLE) {
          wms->seq = S_PREVIEW;
        } else if (wms->from_page == P_NEW) {
          wms->seq = S_CLOSE;
        } else if (wms->from_page == P_UPLOAD) {
           wms->seq = S_FILE;
        } else if (wms->from_page == P_PASSWORD) {
          if (wms->saved_mode == M_DEFAULT)
            wms->seq = S_CLOSE;
          else {
            e = wms->saved_mode != M_CHANGE_PASSWD;
            if (e == 0)
              wms->seq = S_FILE;
          }
        } else {
          e = wms->from_page != P_PREVIEW && wms->from_page != P_EDIT;
          if (e == 0) {
            wms->seq = S_SELECT_EDIT_DECK;
          }
        }
      } else if (memcmp(mult->post_lp, "Edit", 4) == 0) {
        switch (wms->from_page) {
        case P_START:
          wms->seq = S_SELECT_EDIT_DECK;
          break;
        case P_SELECT_DECK:
        case P_SEARCH:
        case P_HISTOGRAM:
          wms->seq = S_EDIT;
          break;
        case P_TABLE:
          wms->seq = S_EDIT_SYNC_RANK;
          break;
        case P_LEARN:
        case P_PREVIEW:
          wms->seq = S_EDIT_SYNC;
          break;
        default:
          e = E_FIELD_6; // unknown from page
        }
      } else if (memcmp(mult->post_lp, "Next", 4) == 0) {
        wms->seq = S_NEXT;
      } else if (memcmp(mult->post_lp, "Open", 4) == 0) {
        if (wms->from_page == P_OPEN) {
          wms->seq = S_GO_LOGIN;
        } else {
          e = wms->from_page != P_FILE;
          if (e == 0) {
            wms->seq = S_FILELIST;
          }
        }
      } else if (memcmp(mult->post_lp, "Move", 4) == 0) {
        if (wms->from_page == P_SELECT_DECK) {
          wms->seq = S_SELECT_DEST_CAT;
        } else if (wms->from_page == P_SELECT_ARRANGE && wms->saved_mode == M_MOVE_DECK) {
          wms->seq = S_MOVE_DECK;
        } else if (wms->from_page == P_EDIT) {
          wms->seq = S_CARD_ARRANGE;
        } else {
          e = wms->from_page != P_SELECT_ARRANGE || wms->saved_mode != M_CARD;
          if (e == 0) {
            wms->seq = S_MOVE_CARD;
          }
        }
      } else if (memcmp(mult->post_lp, "Send", 4) == 0) {
        if (wms->from_page == P_EDIT) {
          wms->seq = S_EDITING_SEND;
        } else {
          e = wms->from_page != P_SELECT_DEST_DECK;
          if (e == 0) {
            if (wms->saved_mode == M_SEND) {
              wms->seq = S_SEND_CARD;
            } else {
              e = wms->saved_mode != M_PROCEED_SEND;
              if (e == 0) {
                wms->seq = S_PROCEED_SEND_CARD;
              }
            }
          }
        }
      } else if (memcmp(mult->post_lp, "Done", 4) == 0) {
        if (wms->from_page == P_TABLE)
          wms->seq = S_START_SYNC_RANK;
        else {
          e = wms->from_page != P_HISTOGRAM;
          if (e == 0)
            wms->seq = S_START;
        }
      } else {
        e = memcmp(mult->post_lp, "File", 4) != 0;
        if (e == 0) {
          wms->seq = S_FILE;
        }
      }
      break;
    case 5:
      if (memcmp(mult->post_lp, "Learn", 5) == 0) {
        if (wms->from_page == P_EDIT) {
          wms->seq = S_QUESTION_SYNCED;
        } else if (wms->from_page == P_START) {
          wms->seq = S_SELECT_LEARN_DECK;
        } else if (wms->from_page == P_TABLE) {
          wms->seq = S_QUESTION_RANK;
        } else if (wms->from_page == P_PREVIEW) {
          wms->seq = S_QUESTION_SYNC_QA;
        } else if (wms->from_page == P_SELECT_DECK) {
          if (wms->saved_mode == M_LEARN) {
            wms->seq = S_LEARN;
          } else {
            e = wms->saved_mode != M_EDIT && wms->saved_mode != M_SEARCH && wms->saved_mode != M_START;
            if (e == 0) {
              wms->seq = S_QUESTION;
            }
          }
        } else {
          e = wms->from_page != P_SEARCH && wms->from_page != P_HISTOGRAM;
          if (e == 0) {
            wms->seq = S_QUESTION;
          }
        }
      } else if (memcmp(mult->post_lp, "Decks", 5) == 0) {
        wms->seq = S_START_DECKS;
      } else if (memcmp(mult->post_lp, "Table", 5) == 0) {
        if (wms->from_page == P_LEARN) {
          wms->seq = S_TABLE_SYNC_QA;
        } else {
          e = wms->from_page != P_MSG;
          if (e == 0) {
            wms->seq = S_TABLE;
          }
        }
      } else if (memcmp(mult->post_lp, "Style", 5) == 0) {
        wms->seq = S_STYLE;
      } else if (memcmp(mult->post_lp, "Apply", 5) == 0) {
        if (wms->from_page == P_PREFERENCES) {
          wms->seq = S_APPLY;
        } else {
          e = wms->from_page != P_STYLE;
          if (e == 0) {
            wms->seq = S_STYLE_APPLY;
          }
        }
      } else if (memcmp(mult->post_lp, "Enter", 5) == 0) {
        wms->seq = S_ENTER;
      } else if (memcmp(mult->post_lp, "Login", 5) == 0) {
        wms->seq = S_LOGIN;
      } else if (memcmp(mult->post_lp, "Erase", 5) == 0) {
        if (wms->from_page == P_FILE) {
          wms->seq = S_ASK_ERASE;
        } else {
          e = wms->from_page != P_MSG;
          if (e == 0) {
            if (wms->saved_mode == M_MSG_FILE) {
              wms->seq = S_ERASE;
            } else {
              e = wms->saved_mode != M_MSG_UPLOAD;
              if (e == 0) {
                wms->seq = S_UPLOAD;
              }
            }
          }
        }
      } else if (memcmp(mult->post_lp, "About", 5) == 0) {
        wms->seq = S_ABOUT;
      } else if (memcmp(mult->post_lp, "Close", 5) == 0) {
        wms->seq = S_CLOSE;
      } else {
        e = memcmp(mult->post_lp, "Start", 5) != 0;
        if (e == 0) {
          wms->seq = S_NONE;
        }
      }
      break;
    case 6:
      if (memcmp(mult->post_lp, "Reveal", 6) == 0) {
        wms->seq = S_REVEAL;
      } else if (memcmp(mult->post_lp, "Append", 6) == 0) {
        wms->seq = S_APPEND;
      } else if (memcmp(mult->post_lp, "Create", 6) == 0) {
        if (wms->from_page == P_SELECT_DECK) {
          wms->seq = S_DECKS_CREATE;
        } else if (wms->from_page == P_NEW) {
          wms->seq = S_CREATE;
        } else {
          e = wms->from_page != P_CAT_NAME;
          if (e == 0) {
            wms->seq = S_CREATE_DECK;
          }
        }
      } else if (memcmp(mult->post_lp, "Cancel", 6) == 0) {
        if (wms->from_page == P_SELECT_DECK || wms->from_page == P_PREFERENCES) {
          wms->seq = S_START;
        } else if (wms->from_page == P_FILE) {
          if (wms->file_title_str != NULL) {
            wms->seq = S_START;
          } else {
            wms->seq = S_NONE;
          }
        } else if (wms->from_page == P_MSG) {
          if (wms->saved_mode == M_MSG_CARD) {
            wms->seq = S_EDIT;
          } else if (wms->saved_mode == M_MSG_DECKS) {
            wms->seq = S_START_DECKS;
          } else if (wms->saved_mode == M_MSG_SUSPEND || wms->saved_mode == M_MSG_RESUME) {
            wms->seq = S_QUESTION;
          } else if (wms->saved_mode == M_MSG_FILE) {
            wms->seq = S_FILE;
          } else {
            e = wms->saved_mode != M_MSG_UPLOAD;
            if (e == 0) {
              wms->seq = S_FILE;
            }
          }
        } else {
          e = wms->from_page != P_OPEN;
          if (e == 0) {
            wms->seq = S_CLOSE;
          }
        }
      } else if (memcmp(mult->post_lp, "Select", 6) == 0) {
        if (wms->from_page == P_SELECT_DEST_DECK) {
          wms->seq = S_SELECT_MOVE_ARRANGE;
        } else {
          e = wms->from_page != P_SELECT_ARRANGE || wms->saved_mode != M_CREATE_DECK;
          if (e == 0) {
            wms->seq = S_DECK_NAME;
          }
        }
      } else if (memcmp(mult->post_lp, "Delete", 6) == 0) {
        if (wms->from_page == P_MSG) {
          if (wms->saved_mode == M_MSG_CARD) {
            wms->seq = S_DELETE_CARD;
          } else {
            e = wms->saved_mode != M_MSG_DECKS;
            wms->seq = S_DELETE_DECK;
          }
        } else if (wms->from_page == P_EDIT) {
          wms->seq = S_ASK_DELETE_CARD;
        } else {
          e = wms->from_page != P_SELECT_DECK;
          wms->seq = S_ASK_DELETE_DECK;
        }
      } else if (memcmp(mult->post_lp, "Rename", 6) == 0) {
        if (wms->from_page == P_SELECT_DECK) {
          wms->seq = S_DECKS_RENAME;
        } else {
          e = wms->from_page != P_CAT_NAME;
          if (e == 0) {
            wms->seq = S_RENAME_DECK;
          }
        }
      } else if (memcmp(mult->post_lp, "Insert", 6) == 0) {
        e = wms->from_page != P_EDIT;
        if (e == 0) {
          wms->seq = S_INSERT;
        }
      } else if (memcmp(mult->post_lp, "Export", 6) == 0) {
        wms->seq = S_EXPORT;
      } else if (memcmp(mult->post_lp, "Upload", 6) == 0) {
        wms->seq = S_UPLOAD_REPORT;
      } else if (memcmp(mult->post_lp, "Toggle", 6) == 0) {
          e = wms->from_page != P_SELECT_DECK;
          if (e == 0) {
            wms->seq = S_TOGGLE;
          }
      } else if (memcmp(mult->post_lp, "Remove", 6) == 0) {
        if (wms->from_page == P_FILE) {
          wms->seq = S_ASK_REMOVE;
        } else {
          e = wms->from_page != P_MSG;
          if (e == 0) {
            e = wms->saved_mode != M_MSG_FILE;
            if (e == 0) {
              wms->seq = S_REMOVE;
            }
          }
        }
      } else if (memcmp(mult->post_lp, "Resume", 6) == 0) {
        if (wms->from_page == P_LEARN) {
          wms->seq = S_ASK_RESUME;
        } else {
          e = wms->from_page != P_MSG;
          wms->seq = S_RESUME;
        }
      } else if (memcmp(mult->post_lp, "Search", 6) == 0) {
        if (wms->from_page == P_EDIT) {
          wms->seq = S_SEARCH_SYNCED;
        } else if (wms->from_page == P_START) {
          wms->seq = S_SELECT_SEARCH_DECK;
        } else if (wms->from_page == P_LEARN || wms->from_page == P_PREVIEW) {
          wms->seq = S_SEARCH_SYNC_QA;
        } else if (wms->from_page == P_TABLE) {
          wms->seq = S_SEARCH_SYNC_RANK;
        } else {
          e = wms->from_page != P_HISTOGRAM && wms->from_page != P_SELECT_DECK;
          if (e == 0)
            wms->seq = S_SEARCH;
        }
      } else if (memcmp(mult->post_lp, "Import", 6) == 0) {
        wms->seq = S_WARN_UPLOAD;
      } else {
        e = memcmp(mult->post_lp, "Change", 6) != 0;
        if (e == 0) {
          wms->seq = S_CHANGE;
        }
      }
      break;
    case 7:
      if (memcmp(mult->post_lp, "Proceed", 7) == 0) {
        wms->seq = S_PROCEED_SYNC_QA;
      } else if (memcmp(mult->post_lp, "Preview", 7) == 0) {
        e = wms->from_page != P_EDIT;
        if (e == 0) {
          wms->seq = S_PREVIEW_SYNC;
        }
      } else if (memcmp(mult->post_lp, "Reverse", 7) == 0) {
        wms->seq = S_SEARCH;
        wms->ms.search_dir = -1;
      } else if (memcmp(mult->post_lp, "Forward", 7) == 0) {
        wms->seq = S_SEARCH;
        wms->ms.search_dir = 1;
      } else if (memcmp(mult->post_lp, "Suspend", 7) == 0) {
        if (wms->from_page == P_LEARN) {
          wms->seq = S_ASK_SUSPEND;
        } else {
          e = wms->from_page != P_MSG;
          wms->seq = S_SUSPEND;
        }
      } else {
        e = memcmp(mult->post_lp, "Refresh", 7) != 0;
        if (e == 0) {
          if (wms->from_page == P_HISTOGRAM) {
            wms->seq = S_HISTOGRAM;
          } else {
            e = wms->from_page != P_TABLE;
            if (e == 0)
              wms->seq = S_TABLE_REFRESH;
          }
        }
      }
      break;
    case 8:
      if (memcmp(mult->post_lp, "Previous", 8) == 0) {
        wms->seq = S_PREVIOUS;
      } else if (memcmp(mult->post_lp, "Password", 8) == 0) {
        wms->seq = S_GO_CHANGE;
      } else {
        e = memcmp(mult->post_lp, "Schedule", 8) != 0;
        if (e == 0) {
          wms->seq = S_SCHEDULE;
        }
      }
      break;
    case 11:
      if (memcmp(mult->post_lp, "Preferences", 11) == 0) {
        wms->seq = S_PREFERENCES;
      } else {
        e = memcmp(mult->post_lp, "ProceedSend", 11) != 0;
        if (e == 0) {
          wms->seq = S_SELECT_PROCEED_SEND;
        }
      }
      break;
    default:
      if (strncmp(mult->post_lp, "Histogram", 9) == 0) {
        e = wms->from_page != P_LEARN;
        if (e == 0)
          wms->seq = S_HISTOGRAM_SYNC_QA;
      } else {
        e = strncmp(mult->post_lp, "OK", 2) != 0;
        if (e == 0) {
          if (wms->from_page == P_ABOUT) {
            if (wms->file_title_str != NULL) {
              wms->seq = S_START;
            } else {
              wms->seq = S_NONE;
            }
          } else if (wms->from_page == P_UPLOAD_REPORT) {
            wms->seq = S_START;
          } else {
            e = wms->from_page != P_MSG;
            if (e == 0) {
              if (wms->saved_mode == M_NONE) {
                e = wms->todo_main == -1;
                if (e == 0) {
                  wms->seq = wms->todo_main;
                }
              } else if (wms->saved_mode == M_MSG_START) {
                wms->seq = S_START;
              } else if (wms->saved_mode == M_MSG_CARD) {
                wms->seq = S_EDIT;
              } else if (wms->saved_mode == M_MSG_SELECT_EDIT) {
                wms->seq = S_SELECT_EDIT_DECK;
              } else if (wms->saved_mode == M_MSG_SELECT_LEARN || wms->saved_mode == M_MSG_NO_CARD_ELIGIBLE) {
                wms->seq = S_SELECT_LEARN_DECK;
              } else if (wms->saved_mode == M_MSG_SELECT_SEARCH) {
                wms->seq = S_SELECT_SEARCH_DECK;
              } else {
                e = wms->saved_mode != M_MSG_DECKS;
                if (e == 0) {
                  wms->seq = S_START_DECKS;
                }
              }
            }
          }
        }
      }
      break;
    }
    break;
  case F_PAGE:
    assert(wms->from_page == P_UNDEF);
    a_n = sscanf(mult->post_lp, "%d", &wms->from_page);
    e = a_n != 1 || wms->from_page < P_START || wms->from_page > P_TABLE;
    break;
  case F_MODE:
    assert(wms->saved_mode == M_NONE);
    a_n = sscanf(mult->post_lp, "%d", &wms->saved_mode);
    e = a_n != 1;
    assert(wms->saved_mode >= M_DEFAULT && wms->saved_mode < M_END);
    break;
  case F_TIMEOUT:
    e = wms->from_page != P_PREFERENCES;
    if (e == 0) {
      assert(wms->timeout == -1);
      a_n = sscanf(mult->post_lp, "%d", &wms->timeout);
      e = a_n != 1;
      if (e == 0)
        assert(wms->timeout >= 0 && wms->timeout < 5);
    }
    break;
  default:
    e = E_FIELD_7; // unknown Field value
    break;
  }
  return e;
}

static int parse_post(struct WebMemorySurfer *wms)
{
  int e;
  int rv; // return value
  char *str;
  enum Stage stage;
  size_t len;
  size_t size;
  struct Multi *mult;
  char *boundary_str;
  FILE *temp_stream;
  int i;
  int j;
  int ch;
  int tv; // test value
  int post_tp;
  struct Parse *parse;
  boundary_str = NULL;
  size = sizeof(struct Multi);
  mult = malloc(size);
  size = sizeof(struct Parse);
  parse = malloc(size);
  e = mult == NULL || parse == NULL;
  if (e == 0) {
    mult->post_lp = NULL;
    mult->post_n = 0;
    mult->delim_str[0] = "=";
    mult->delim_str[1] = "--";
    stage = T_NULL;
    parse->field = F_UNKNOWN;
    do {
      e = multi_delim(mult);
      if (mult->nread_del > 0 && e == 0) {
        e = append_part(wms, mult);
      }
      if (e == 0) {
        switch (stage) {
        case T_NULL:
          if (mult->nread_del > 0) {
            if (mult->post_fp > 0 && mult->post_lp[mult->post_fp] == '=') {
              stage = T_URLENCODE_EQUALS;
            } else {
              e = mult->post_fp != 0 || mult->nread_del != 2 || memcmp(mult->post_lp, "--", 2) != 0;
              if (e == 0) {
                stage = T_BOUNDARY_INIT;
                mult->delim_str[0] = "\r\n";
                mult->delim_str[1] = NULL;
                break;
              } else {
                break;
              }
            }
          } else {
            break;
          }
        case T_URLENCODE_EQUALS:
          if (mult->post_fp >= 0)
            str = mult->post_lp + mult->post_fp;
          else if (parse->field != F_UNKNOWN)
            str = "&";
          else
            str = NULL;
          if (str != NULL) {
            if (memcmp (str, "=", 1) == 0) {
              assert(parse->field == F_UNKNOWN);
              e = mult->post_fp < 0;
              if (e == 0) {
                e = determine_field(mult, parse);
                if (e == 0) {
                  stage = T_URLENCODE_AMP;
                  mult->delim_str[0] = "&";
                  mult->delim_str[1] = NULL;
                }
              }
            }
          }
          break;
        case T_URLENCODE_AMP:
          if (mult->post_fp >= 0)
            str = mult->post_lp + mult->post_fp;
          else if (parse->field != F_UNKNOWN)
            str = "&";
          else
            str = NULL;
          if (str != NULL) {
            if (memcmp (str, "&", 1) == 0) {
              e = strncmp(str, "&", 1) != 0;
              if (e == 0) {
                if (mult->post_fp < 0) {
                  mult->post_fp = mult->post_wp;
                  mult->post_wp++;
                  e = mult->post_wp < 0 || mult->post_wp >= mult->post_n;
                }
                if (e == 0) {
                  mult->post_lp[mult->post_fp] = '\0';
                  e = parse_field(wms, mult, parse);
                  if (e == 0) {
                    parse->field = F_UNKNOWN;
                    stage = T_URLENCODE_EQUALS;
                    mult->delim_str[0] = "=";
                    mult->delim_str[1] = NULL;
                  }
                }
              }
            }
          }
          break;
        case T_BOUNDARY_INIT:
          e = mult->post_fp < 0; // "\r\n"
          if (e == 0) {
            assert(boundary_str == NULL);
            size = mult->nread_del - 1;
            e = size <= 71 ? 0 : E_PARSE_1; // boundary exceeded
            if (e == 0) {
              boundary_str = malloc(size);
              e = boundary_str == NULL;
              if (e == 0) {
                memcpy(boundary_str, mult->post_lp, mult->nread_del - 2);
                boundary_str[mult->nread_del - 2] = '\0';
                stage = T_CONTENT;
                mult->delim_str[0] = "; ";
                mult->delim_str[1] = NULL;
              }
            }
          }
          break;
        case T_CONTENT:
          e = mult->post_fp != 30; // "; "
          if (e == 0) {
            e = strncmp(mult->post_lp, "Content-Disposition: form-data", 30) != 0;
            if (e == 0) {
              stage = T_NAME;
              mult->delim_str[0] = "=\"";
            }
          }
          break;
        case T_NAME:
          e = mult->post_fp != 4; // "=\""
          if (e == 0) {
            e = strncmp(mult->post_lp, "name", 4) != 0;
            if (e == 0) {
              stage = T_NAME_QUOT;
              mult->delim_str[0] = "\"";
              mult->delim_str[1] = NULL;
            }
          }
          break;
        case T_NAME_QUOT:
          e = mult->post_fp < 0; // "\""
          if (e == 0) {
            e = determine_field(mult, parse);
            if (e == 0) {
              if (parse->field != F_UPLOAD) {
                stage = T_VALUE_START;
                mult->delim_str[0] = "\r\n\r\n";
                mult->delim_str[1] = NULL;
              } else {
                stage = T_FILENAME;
                mult->delim_str[0] = "; filename=\"";
                mult->delim_str[1] = NULL;
              }
            }
          }
          break;
        case T_VALUE_START:
          e = mult->post_fp != 0;
          if (e == 0) {
            stage = T_VALUE_CRLFMINUSMINUS;
            mult->delim_str[0] = "\r\n--";
            mult->delim_str[1] = NULL;
          }
          break;
        case T_VALUE_CRLFMINUSMINUS:
          e = mult->post_fp < 0;
          if (e == 0) {
            mult->post_lp[mult->post_fp] = '\0';
            assert(mult->post_wp == mult->post_fp + 4);
            mult->post_wp = mult->post_fp + 1;
            e = parse_field(wms, mult, parse);
            if (e == 0) {
              stage = T_BOUNDARY_CHECK;
              mult->delim_str[0] = "\r\n";
            }
          }
          break;
        case T_FILENAME:
          e = mult->post_fp != 0;
          if (e == 0) {
            stage = T_FILENAME_QUOT;
            mult->delim_str[0] = "\"\r\n";
            mult->delim_str[1] = NULL;
          }
          break;
        case T_FILENAME_QUOT:
          tv = mult->post_fp <= 4;
          if (tv == 0) {
            mult->post_lp[mult->post_fp] = '\0';
            str = strrchr(mult->post_lp, '.');
            i = str - mult->post_lp;
            assert(i > 0 && mult->post_fp >= i);
            len = mult->post_fp - i;
            tv = str == NULL || len != 4 || strncmp(str, ".xml", 4) != 0;
            if (tv == 0) {
              str = strrchr(mult->post_lp, '#');
              if (str != NULL && strncmp(str, "#sha1-", 6) == 0) {
                j = str - mult->post_lp + 6;
                assert(i >= j);
                len = i - j;
                size = SHA1_HASH_SIZE * 2;
                e = len < size ? E_HASH_1 : 0;
                if (e == 0) {
                  e = wms->posted_message_digest != NULL ? E_HASH_2 : 0;
                  if (e == 0) {
                    wms->posted_message_digest = malloc(SHA1_HASH_SIZE);
                    e = wms->posted_message_digest == NULL;
                    if (e == 0) {
                      e = scan_hex(wms->posted_message_digest, mult->post_lp + j, SHA1_HASH_SIZE);
                    }
                  }
                }
              }
            }
          }
          if (e == 0) {
            stage = T_VALUE_XML;
            mult->delim_str[0] = "\r\n\r\n";
            mult->delim_str[1] = NULL;
          }
          break;
        case T_VALUE_XML:
          e = mult->post_fp < 0 || parse->field != F_UPLOAD; // "\r\n\r\n"
          if (e == 0) {
            e = mult->post_fp != 38 || strncmp(mult->post_lp, "Content-Type: application/octet-stream", 38) != 0;
            if (e == 1) {
              e = mult->post_fp != 22 || strncmp(mult->post_lp, "Content-Type: text/xml", 22) != 0;
              if (e == 1) {
                e = mult->post_fp != 29 || strncmp(mult->post_lp, "Content-Type: application/xml", 29) != 0;
              }
            }
          }
          if (e == 0) {
            size = strlen(DATA_PATH) + 17; // + '/' + 9999999999 + . + temp + '\0'
            assert(wms->temp_filename == NULL);
            wms->temp_filename = malloc(size);
            e = wms->temp_filename == NULL;
            if (e == 0) {
              rv = snprintf(wms->temp_filename, size, "%s/%ld.temp", DATA_PATH, wms->ms.timestamp);
              e = rv < 0 || rv >= size;
              if (e == 0) {
                temp_stream = fopen(wms->temp_filename, "w");
                e = temp_stream == NULL;
                if (e == 0) {
                  len = strlen(boundary_str);
                  assert(len > 0 && len <= 70);
                  e = mult->post_n < 128; // \r\n--%s\r\n
                  if (e == 0) {
                    mult->post_wp = 0;
                    tv = 0;
                    while (e == 0 && tv == 0) {
                      ch = fgetc(stdin);
                      e = ch == EOF;
                      if (e == 0) {
                        mult->post_lp[mult->post_wp & 0x7f] = ch;
                        post_tp = mult->post_wp - len - 5;
                        mult->post_wp++;
                        e = mult->post_wp < 0;
                        if (e == 0 &&  post_tp >= 0) {
                          if (mult->post_lp[post_tp & 0x7f] == '\r'
                              && mult->post_lp[(post_tp+1) & 0x7f] == '\n'
                              && mult->post_lp[(post_tp+2) & 0x7f] == '-'
                              && mult->post_lp[(post_tp+3) & 0x7f] == '-') {
                            i = 0;
                            while (boundary_str[i] == mult->post_lp[(post_tp+4+i) & 0x7f] && i < len) {
                              i++;
                            }
                            tv = i == len
                                && mult->post_lp[(post_tp+4+len) & 0x7f] == '\r'
                                && mult->post_lp[(post_tp+5+len) & 0x7f] == '\n';
                          }
                          if (tv == 0) {
                            rv = fputc(mult->post_lp[post_tp & 0x7f], temp_stream);
                            e = rv == EOF;
                          }
                        }
                      }
                    }
                  }
                  rv = fclose(temp_stream);
                  if (e == 0) {
                    e = rv != 0 ? E_PARSE_2 : 0;
                  }
                  temp_stream = NULL;
                }
              }
            }
          }
          if (e == 0) {
            stage = T_CONTENT;
            mult->delim_str[0] = "; ";
            mult->delim_str[1] = NULL;
          }
          break;
        case T_BOUNDARY_CHECK:
          assert(boundary_str != NULL);
          len = strlen(boundary_str);
          e = strncmp(mult->post_lp, boundary_str, len) != 0;
          if (e == 0) {
            if (mult->post_fp == len) {
              stage = T_CONTENT;
              mult->delim_str[0] = "; ";
              mult->delim_str[1] = NULL;
            } else if (mult->post_fp == len + 2) {
              e = strncmp(mult->post_lp + mult->post_fp - 2, "--", 2) != 0;
              if (e == 0) {
                stage = T_EPILOGUE;
                mult->delim_str[0] = NULL;
              }
            } else {
              e = E_PARSE_3;
            }
          }
          break;
        case T_EPILOGUE:
          break;
        }
      }
    } while (mult->nread_del != -1 && e == 0);
    free(boundary_str);
    boundary_str = NULL;
    free(parse);
    parse = NULL;
    free(mult->post_lp);
    mult->post_lp = NULL;
    mult->post_n = 0;
    free(mult);
    mult = NULL;
  }
  return e;
}

static char *sa_get(struct StringArray *sa, int16_t sa_i)
{
  char *ret_str;
  char ch;
  int pos; // get
  int i;
  assert(sa != NULL && sa->sa_c >= 0);
  ret_str = NULL;
  if (sa_i >= 0 && sa_i < sa->sa_c) {
    pos = 0;
    for (i = 0; i != sa_i; i++) {
      do {
        ch = sa->sa_d[pos++];
      } while (ch != '\0');
    }
    assert(pos < sa->sa_n);
    ret_str = sa->sa_d + pos;
  }
  return ret_str;
}

enum { ESC_AMP = 1, ESC_LT = 2, ESC_QUOT = 4 };

static int xml_escape(char **xml_str_ptr, size_t *xml_n_ptr, char *str_text, int escape_mask) {
  int e;
  char ch;
  int src;
  int dest;
  e = xml_str_ptr == NULL || xml_n_ptr == NULL;
  if (e == 0) {
    if (str_text == NULL)
      str_text = "";
    src = 0;
    dest = 0;
    do
    {
      ch = str_text[src++];
      while (((dest + 6) > *xml_n_ptr) && (e == 0)) {
        *xml_n_ptr = (*xml_n_ptr << 1) | 1;
        *xml_str_ptr = realloc (*xml_str_ptr, *xml_n_ptr);
        e = *xml_str_ptr == NULL;
      }
      switch (ch) {
      case '&':
        if (escape_mask & ESC_AMP) {
          (*xml_str_ptr)[dest++] = '&';
          (*xml_str_ptr)[dest++] = 'a';
          (*xml_str_ptr)[dest++] = 'm';
          (*xml_str_ptr)[dest++] = 'p';
          (*xml_str_ptr)[dest++] = ';';
        }
        else
          (*xml_str_ptr)[dest++] = '&';
        break;
      case '<':
        if (escape_mask & ESC_LT) {
          (*xml_str_ptr)[dest++] = '&';
          (*xml_str_ptr)[dest++] = 'l';
          (*xml_str_ptr)[dest++] = 't';
          (*xml_str_ptr)[dest++] = ';';
        }
        else
          (*xml_str_ptr)[dest++] = '<';
        break;
      case '"':
        if (escape_mask & ESC_QUOT) {
          (*xml_str_ptr)[dest++] = '&';
          (*xml_str_ptr)[dest++] = 'q';
          (*xml_str_ptr)[dest++] = 'u';
          (*xml_str_ptr)[dest++] = 'o';
          (*xml_str_ptr)[dest++] = 't';
          (*xml_str_ptr)[dest++] = ';';
        }
        else
          (*xml_str_ptr)[dest++] = '"';
        break;
      default:
        (*xml_str_ptr)[dest++] = ch;
        break;
      }
    } while ((ch != '\0') && (e == 0));
  }
  return e;
}

static int inds_set(struct IndentStr *inds, int indent_n, int change_flag)
{
  int e;
  char *str;
  size_t size;
  int i;
  e = inds->indent_n == -1 && change_flag != 0;
  if (e == 0) {
    if (change_flag > 0) {
      indent_n = inds->indent_n + indent_n;
    } else if (change_flag < 0) {
      indent_n = inds->indent_n - indent_n;
    }
    e = indent_n < 0;
    if (e == 0) {
      if (indent_n >= inds->size) {
        size = (indent_n / 32 + 1) * 32;
        str = realloc(inds->str, size);
        e = str == NULL;
        if (e == 0) {
          inds->str = str;
          inds->size = size;
        }
      }
      if (e == 0) {
        if (inds->indent_n == -1) {
          inds->indent_n = 0;
        }
        if (inds->indent_n < indent_n) {
          for (i = inds->indent_n; i < indent_n; i++)
            inds->str[i] = '\t';
          inds->str[i] = '\0';
        } else {
          inds->str[indent_n] = '\0';
        }
        inds->indent_n = indent_n;
      }
    }
  }
  return e;
}

enum Hierarchy { H_CHILD, H_SIBLING };
enum SelType { Y_RADIO, Y_CHECKBOX };

static int gen_html_deck(int16_t n_create, enum Hierarchy hierarchy, struct WebMemorySurfer *wms, enum SelType sel_type)
{
  int e;
  int rv;
  char *str;
  e = 0;
  assert(sel_type == Y_RADIO || sel_type == Y_CHECKBOX);
  if (n_create >= 0) {
    if (hierarchy == H_CHILD) {
      rv = printf("%s<ul class=\"msf\">\n", wms->inds->str);
      e = rv < 0;
    }
    if (e == 0) {
      str = sa_get(&wms->ms.deck_sa, n_create);
      e = str == NULL;
      if (e == 0) {
        e = xml_escape(&wms->html_lp, &wms->html_n, str, ESC_AMP | ESC_LT);
        if (e == 0) {
          assert(sel_type == Y_CHECKBOX ? wms->ms.mov_deck_i == -1 : 1);
          if (sel_type == Y_RADIO) {
            str = n_create == wms->ms.deck_i ? " checked autofocus" : "";
          } else {
            str = wms->ms.cat_t[n_create].deck_on == 1 ? " checked" : "";
          }
          rv = printf("%s\t<li><details%s><summary><label class=\"msf-td\"><input type=\"%s\" name=\"deck\" value=\"%d\"%s%s>%s</label></summary>%s\n",
              wms->inds->str,
              wms->ms.cat_t[n_create].deck_x != 0 ? " open" : "",
              sel_type == Y_RADIO ? "radio" : "checkbox",
              n_create,
              str,
              n_create == wms->ms.mov_deck_i ? " disabled" : "",
              wms->html_lp,
              wms->ms.cat_t[n_create].n_child == -1 ? "</details></li>" : "");
          e = rv < 0;
          if (e == 0) {
            if (wms->ms.cat_t[n_create].n_child != -1) {
              e = inds_set(wms->inds, 2, 1);
              if (e == 0) {
                e = gen_html_deck(wms->ms.cat_t[n_create].n_child, H_CHILD, wms, sel_type);
                if (e == 0) {
                  e = inds_set(wms->inds, 2, -1);
                }
              }
              if (e == 0) {
                rv = printf("%s\t</details></li>\n", wms->inds->str);
                e = rv < 0;
              }
            }
            if (e == 0) {
              if (wms->ms.cat_t[n_create].n_sibling != -1) {
                e = gen_html_deck(wms->ms.cat_t[n_create].n_sibling, H_SIBLING, wms, sel_type);
              }
              if (e == 0) {
                if (hierarchy == H_CHILD) {
                  rv = printf("%s</ul>\n", wms->inds->str);
                  e = rv < 0;
                }
              }
            }
          }
        }
      }
    }
  }
  return e;
}

enum
{
  SECONDS_MINUTE = 60,
  SECONDS_HOUR = SECONDS_MINUTE * 60,
  SECONDS_DAY = SECONDS_HOUR * 24,
  SECONDS_MONTH = SECONDS_DAY * 30,
  SECONDS_YEAR = SECONDS_DAY * 365
};

static void set_time_str(char *time_diff_str, time_t time_set)
{
  int n_stored;
  char *str_cursor;
  int n_years;
  int n_month;
  int n_days;
  int n_hours;
  int n_minutes;
  int n_seconds;
  int valid_c; // count
  char *space_str;
  str_cursor = time_diff_str;
  valid_c = 0;
  n_years = time_set / SECONDS_YEAR;
  if (n_years) {
    valid_c = 48;
    time_set -= SECONDS_YEAR * n_years;
  }
  n_month = time_set / SECONDS_MONTH;
  if (n_month) {
    if (valid_c == 0) valid_c = 24;
    time_set -= SECONDS_MONTH * n_month;
  }
  n_days = time_set / SECONDS_DAY;
  if (n_days) {
    if (valid_c == 0) valid_c = 12;
    time_set -= SECONDS_DAY * n_days;
  }
  n_hours = time_set / SECONDS_HOUR;
  if (n_hours) {
    if (valid_c == 0) valid_c = 6;
    time_set -= SECONDS_HOUR * n_hours;
  }
  n_minutes = time_set / SECONDS_MINUTE;
  if (n_minutes) {
    if (valid_c == 0) valid_c = 3;
    time_set -= SECONDS_MINUTE * n_minutes;
  }
  n_seconds = time_set;
  if (valid_c == 0) valid_c = 1;
  time_set -= n_seconds;
  if (valid_c & 32) {
    n_stored = sprintf(str_cursor, "%dY", n_years);
    str_cursor += n_stored;
  }
  if ((valid_c & 16) && n_month != 0) {
    space_str = valid_c & 32 ? " " : "";
    n_stored = sprintf(str_cursor, "%s%dM", space_str, n_month);
    str_cursor += n_stored;
  }
  if ((valid_c & 8) && n_days != 0) {
    space_str = valid_c & 16 ? " " : "";
    n_stored = sprintf(str_cursor, "%s%dD", space_str, n_days);
    str_cursor += n_stored;
  }
  if ((valid_c & 4) && n_hours != 0) {
    space_str = valid_c & 8 ? " " : "";
    n_stored = sprintf(str_cursor, "%s%dh", space_str, n_hours);
    str_cursor += n_stored;
  }
  if ((valid_c & 2) && n_minutes != 0) {
    space_str = valid_c & 4 ? " " : "";
    n_stored = sprintf(str_cursor, "%s%dm", space_str, n_minutes);
    str_cursor += n_stored;
  }
  if (valid_c & 1) {
    space_str = valid_c & 2 ? " " : "";
    if (n_seconds != 0 || (valid_c & 2) == 0)
      n_stored = sprintf(str_cursor, "%s%ds", space_str, n_seconds);
  }
}

struct XmlGenerator {
  FILE *w_stream; // write
  char *w_lineptr;
  size_t w_n;
};

static void sa_init(struct StringArray *sa)
{
  sa->sa_c = 0;
  sa->sa_d = NULL;
  sa->sa_n = 0;
  assert(sizeof(char) == 1);
}

static void sa_free(struct StringArray *sa)
{
  sa->sa_c = 0;
  free(sa->sa_d);
  sa->sa_d = NULL;
  sa->sa_n = 0;
}

static int gen_xml_category(int16_t deck_i, struct XmlGenerator *xg, struct MemorySurfer *ms, struct IndentStr *inds)
{
  int e;
  int rv;
  struct Deck *cat_ptr;
  char *str;
  int32_t data_size;
  struct Card *card_l;
  int card_a;
  int card_i;
  struct Card *card_ptr;
  struct StringArray card_sa;
  struct tm bd_time; // broken-down
  time_t card_time;
  char time_str[20]; // 1971-01-01T00:00:00
  char strength_str[16];
  char state_ch;
  char *q_str;
  char *a_str;
  rv = fprintf(xg->w_stream, "\n%s<deck>", inds->str);
  e = rv < 0;
  if (e == 0) {
    e = inds_set(inds, 1, 1);
    if (e == 0) {
      cat_ptr = ms->cat_t + deck_i;
      str = sa_get(&ms->deck_sa, deck_i);
      e = str == NULL;
      if (e == 0) {
        e = xml_escape(&xg->w_lineptr, &xg->w_n, str, ESC_AMP | ESC_LT);
        if (e == 0) {
          rv = fprintf(xg->w_stream, "\n%s<name>%s</name>", inds->str, xg->w_lineptr);
          e = rv < 0;
          if (e == 0) {
            str = sa_get(&ms->style_sa, deck_i);
            if (str != NULL && str[0] != '\0') {
              e = xml_escape(&xg->w_lineptr, &xg->w_n, str, ESC_AMP | ESC_LT);
              if (e == 0) {
                rv = fprintf(xg->w_stream, "\n%s<style>%s</style>", inds->str, xg->w_lineptr);
                e = rv < 0;
              }
            }
          }
          if (e == 0) {
            data_size = imf_get_size(&ms->imf, cat_ptr->cat_cli);
            card_l = malloc(data_size);
            e = card_l == NULL;
            if (e == 0) {
              e = imf_get(&ms->imf, cat_ptr->cat_cli, card_l);
              if (e == 0) {
                sa_init(&card_sa);
                card_a = data_size / sizeof(struct Card);
                card_i = 0;
                while ((card_i < card_a) && (e == 0))
                {
                  card_ptr = card_l + card_i;
                  e = sa_load(&card_sa, &ms->imf, card_ptr->card_qai);
                  if (e == 0) {
                    rv = fprintf(xg->w_stream, "\n%s<card>", inds->str);
                    e = rv < 0;
                    if (e == 0) {
                      memset(&bd_time, 0, sizeof (bd_time));
                      assert((card_ptr->card_time < INT32_MAX) || (sizeof(card_time) == 8));
                      card_time = card_ptr->card_time;
                      e = gmtime_r(&card_time, &bd_time) == NULL;
                      if (e == 0) {
                        bd_time.tm_mon += 1;
                        bd_time.tm_year += 1900;
                        rv = snprintf(time_str, sizeof(time_str), "%4d-%02d-%02dT%02d:%02d:%02d",
                            bd_time.tm_year, bd_time.tm_mon, bd_time.tm_mday,
                            bd_time.tm_hour, bd_time.tm_min, bd_time.tm_sec);
                        e = rv != 19;
                        if (e == 0) {
                          rv = fprintf(xg->w_stream, "\n\t%s<time>%s</time>", inds->str, time_str);
                          e = rv < 0;
                          if (e == 0) {
                            rv = snprintf(strength_str, sizeof(strength_str), "%d", card_ptr->card_strength);
                            e = rv < 0 || rv >= sizeof(strength_str);
                            if (e == 0) {
                              state_ch = '0' + (card_ptr->card_state & 0x07);
                              rv = fprintf(xg->w_stream, "\n\t%s<strength>%s</strength>", inds->str, strength_str);
                              e = rv < 0;
                              if (e == 0) {
                                rv = fprintf(xg->w_stream, "\n\t%s<state>%c</state>", inds->str, state_ch);
                                e = rv < 0;
                              }
                              if (e == 0 && card_ptr->card_state & 0x08) {
                                rv = fprintf(xg->w_stream, "\n\t%s<type>1</type>", inds->str);
                                e = rv < 0;
                              }
                              if (e == 0) {
                                q_str = sa_get(&card_sa, 0);
                                e = q_str == NULL;
                                if (e == 0) {
                                  e = xml_escape(&xg->w_lineptr, &xg->w_n, q_str, ESC_AMP | ESC_LT);
                                  if (e == 0) {
                                    rv = fprintf(xg->w_stream, "\n\t%s<question>%s</question>", inds->str, xg->w_lineptr);
                                    e = rv < 0;
                                    if (e == 0) {
                                      a_str = sa_get(&card_sa, 1);
                                      e = a_str == NULL;
                                      if (e == 0) {
                                        e = xml_escape(&xg->w_lineptr, &xg->w_n, a_str, ESC_AMP | ESC_LT);
                                        if (e == 0) {
                                          rv = fprintf(xg->w_stream, "\n\t%s<answer>%s</answer></card>", inds->str, xg->w_lineptr);
                                          e = rv < 0;
                                          if (e == 0) {
                                            card_i++;
                                          }
                                        }
                                      }
                                    }
                                  }
                                }
                              }
                            }
                          }
                        }
                      }
                    }
                  }
                }
                sa_free(&card_sa);
                if (e == 0) {
                  if (ms->cat_t[deck_i].n_child != -1) {
                    e = gen_xml_category(ms->cat_t[deck_i].n_child, xg, ms, inds);
                  }
                  if (e == 0) {
                    e = fputs("</deck>", xg->w_stream) <= 0;
                    if (e == 0) {
                      e = inds_set(inds, 1, -1);
                      if (e == 0) {
                        if (ms->cat_t[deck_i].n_sibling != -1) {
                          e = gen_xml_category(ms->cat_t[deck_i].n_sibling, xg, ms, inds);
                        }
                      }
                    }
                  }
                }
              }
              free(card_l);
            }
          }
        }
      }
    }
  }
  return e;
}

static const struct Timeout timeouts[5] = {
  { 60, 10 }, // 10m
  { 60, 60 }, // 1h
  { 60, 360 }, // 6h
  { 120, 360 }, //12h
  { 240, 360 } // 24h
};

static time_t lvl_s[21] = { // level strength
  60, // 1m (0)
  120, // 2m (1)
  300, // 5m (2)
  900, // 15m (3)
  1800, // 30m (4)
  3600, // 1h (5)
  14400, // 4h (6)
  43200, // 12h (7)
  86400, // 1D (8)
  172800, // 2D (9)
  345600, // 4D (10)
  604800, // 7D (11)
  1209600, // 14D (12)
  2592000, // 1M (13)
  7776000,  // 3M (14)
  15552000, // 6M (15)
  31536000, // 1Y (16)
  63072000, // 2Y (17)
  157680000, // 5Y (18)
  315360000, // 10Y (19)
  630720000 // 20Y (20)
};

static void print_hex(char *str, uint8_t *data, size_t count)
{
  int i;
  int nibble[2];
  char ch;
  str[count * 2] = '\0';
  while (count--) {
    nibble[1] = data[count] & 0xf;
    nibble[0] = data[count] >> 4;
    i = 2;
    while (i--) {
      ch = nibble[i];
      if (ch >= 10) {
        ch += 'a' - 10;
      } else {
        ch += '0';
      }
      str[count * 2 + i] = ch;
    }
  }
}

static int gen_html(struct WebMemorySurfer *wms)
{
  int e;
  int rv;
  int i;
  int j;
  int k;
  int lvl; // level
  int lvl_sel; // select
  char *q_str;
  char *a_str;
  time_t time_diff;
  char time_diff_str[32];
  int x;
  int y;
  char *str;
  const char *dis_str; // disabled
  const char *attr_str; // attribute
  const char *header_str;
  const char *notice_str;
  const char *submit_str;
  char *text_str;
  char *ext_str;
  char *dup_str;
  char title_str[64];
  FILE *temp_stream;
  char *temp_filename;
  char digest_str[41];
  struct XmlGenerator xg;
  struct Sha1Context sha1;
  uint8_t message_digest[SHA1_HASH_SIZE];
  char *sw_info_str;
  char mtime_str[17];
  struct stat file_stat;
  int n;
  int dx; // delta
  int dy;
  int vby; // viewbox
  static const char *TIMEOUTS[] = { "10 m", "1 h", "6 h", "12 h", "24 h" };
  size_t size;
  size_t len;
  enum Block bl;
  static const char *state_str[] = { "Alarm", "Scheduled", "New", "Suspended" };
  static const char *event_str[] = { "Edit", "Learn", "Search" };
  char el_str[5]; // "100%"
  int bl_i; // block index
  enum SelType sel_type;
  e = 0;
  mtime_str[0] = '\0';
  if (wms->ms.imf_filename != NULL) {
    size = sizeof(struct stat);
    memset(&file_stat, 0, size);
    e = stat(wms->ms.imf_filename, &file_stat);
    if (e == 0) {
      assert(file_stat.st_mtim.tv_sec >= 0 && file_stat.st_mtim.tv_nsec >= 0);
      size = sizeof(mtime_str);
      rv = snprintf(mtime_str, size, "%08x%08x", (uint32_t) file_stat.st_mtim.tv_sec, (uint32_t) file_stat.st_mtim.tv_nsec);
      e = rv != 16;
    }
  }
  if (e == 0) {
    size = sizeof(title_str);
    rv = snprintf(title_str, size, "MemorySurfer - Welcome");
    e = rv < 0 || rv >= size;
    if (wms->file_title_str != NULL && e == 0) {
      e = xml_escape(&wms->html_lp, &wms->html_n, wms->file_title_str, ESC_AMP | ESC_LT);
      if (e == 0) {
        rv = snprintf(title_str, size, "MemorySurfer – %s", wms->html_lp);
        e = rv < 0;
      }
    }
  }
  if (e == 0) {
    e = sw_stop(wms->sw_i, &wms->ms.imf.sw);
    if (e == 0)
      e = sw_info(&sw_info_str, &wms->ms.imf.sw);
  }
  assert(wms->tok_str[0] == '\0' || wms->tok_str[40] == '\0');
  if (e == 0) {
    bl_i = 0;
    while ((bl = block_seq[wms->page][bl_i++]) != B_END && e == 0) {
      switch (bl) {
      case B_START_HTML:
        rv = printf("Content-Type: text/html; charset=utf-8\r\n\r\n"
                    "<!DOCTYPE html>\n"
                    "<html lang=\"en\">\n"
                    "\t<head>\n"
                    "\t\t<meta charset=\"utf-8\">\n"
                    "\t\t<title>%s</title>\n"
                    "\t\t<meta name=\"viewport\" content=\"width=device-width\">\n"
                    "\t\t<meta name=\"description\" content=\"Open source software to efficiently memorize flashcards.\">\n"
                    "\t\t<link rel=\"shortcut icon\" href=\"/favicon.ico\">\n"
                    "\t\t<link rel=\"stylesheet\" type=\"text/css\" href=\"/ms.css\">\n",
            title_str);
        e = rv < 0;
        if ((wms->page == P_PREVIEW || wms->page == P_LEARN) && e == 0) {
          rv = printf("\t\t<script src=\"/ms.js\" defer></script>\n");
          e = rv < 0;
        }
        if (e == 0 && (wms->page == P_LEARN || wms->page == P_PREVIEW)) {
          assert(wms->ms.passwd.style_sai < 0 || wms->ms.style_sa.sa_n > 0);
          str = sa_get(&wms->ms.style_sa, wms->ms.deck_i);
          if (str != NULL && str[0] != '\0') {
            rv = printf("\t\t<style>%s</style>\n", str);
            e = rv < 0;
          }
        }
        if (e == 0) {
          rv = printf("\t\t<link rel=\"license\" href=\"https://www.gnu.org/licenses/old-licenses/gpl-2.0.html\">\n"
                      "\t</head>\n"
                      "\t<body id=\"msf\">\n");
          e = rv < 0;
        }
        break;
      case B_FORM_URLENCODED:
        rv = printf("\t\t<form enctype=\"application/x-www-form-urlencoded\" method=\"post\" action=\"memorysurfer.cgi\">\n");
        e = rv < 0;
        break;
      case B_FORM_MULTIPART:
        rv = printf("\t\t<form enctype=\"multipart/form-data\" method=\"post\" action=\"memorysurfer.cgi\">\n");
        e = rv < 0;
        break;
      case B_OPEN_DIV:
        rv = printf("\t\t\t<div>\n"
                    "\t\t\t\t<input type=\"hidden\" name=\"page\" value=\"%d\">\n",
            wms->page);
        e = rv < 0;
        if (e == 0 && wms->mode >= M_DEFAULT && wms->mode < M_END) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"mode\" value=\"%d\">\n", wms->mode);
          e = rv < 0;
        }
        if (e == 0 && wms->file_title_str != NULL) {
          e = xml_escape(&wms->html_lp, &wms->html_n, wms->file_title_str, ESC_AMP | ESC_QUOT);
          if (e == 0) {
            rv = printf("\t\t\t\t<input type=\"hidden\" name=\"file-title\" value=\"%s\">\n", wms->html_lp);
            e = rv < 0;
          }
        }
        if (e == 0 && strlen(wms->tok_str) == 40) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"token\" value=\"%s\">\n", wms->tok_str);
          e = rv < 0;
        }
        if (e == 0 && wms->ms.card_i >= 0 && ((wms->page == P_SELECT_ARRANGE && wms->mode == M_CARD) || (wms->page == P_SELECT_DEST_DECK && wms->mode == M_SEND) || (wms->page == P_SELECT_DEST_DECK && wms->mode == M_PROCEED_SEND) || wms->page == P_EDIT || wms->page == P_PREVIEW || wms->page == P_SEARCH || wms->page == P_LEARN || wms->page == P_MSG || wms->page == P_HISTOGRAM || wms->page == P_TABLE || wms->page == P_STYLE)) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"card\" value=\"%d\">\n", wms->ms.card_i);
          e = rv < 0;
        }
        if (e == 0) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"mctr\" value=\"%u\">\n", wms->ms.passwd.mctr);
          e = rv < 0;
        }
        if (e == 0 && strlen(mtime_str) == 16) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"mtime\" value=\"%s\">\n", mtime_str);
          e = rv < 0;
        }
        if (e == 0 && wms->reveal_pos >= 0) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"reveal-pos\" value=\"%d\">\n", wms->reveal_pos);
          e = rv < 0;
        }
        if (e == 0 && wms->ms.match_case > 0 && wms->page != P_SEARCH) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"match-case\" value=\"on\">\n");
          e = rv < 0;
        }
        if (e == 0 && wms->ms.scope >= C_CURRENT && wms->page != P_SEARCH) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"scope\" value=\"%d\">\n", wms->ms.scope);
          e = rv < 0;
        }
        if (e == 0 && wms->ms.mov_deck_i >= 0 && (wms->page == P_SELECT_DEST_DECK || (wms->page == P_SELECT_ARRANGE && wms->mode == M_MOVE_DECK))) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"mov-deck\" value=\"%d\">\n", wms->ms.mov_deck_i);
          e = rv < 0;
        }
        break;
      case B_HIDDEN_CAT:
        if (wms->ms.deck_i >= 0) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"deck\" value=\"%d\">\n", wms->ms.deck_i);
          e = rv < 0;
        }
        break;
      case B_HIDDEN_ARRANGE:
        if (wms->ms.arrange >= 0) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"arrange\" value=\"%d\">\n", wms->ms.arrange);
          e = rv < 0;
        }
        break;
      case B_HIDDEN_CAT_NAME:
        if (wms->ms.deck_name_str != NULL) {
          e = xml_escape(&wms->html_lp, &wms->html_n, wms->ms.deck_name_str, ESC_AMP | ESC_QUOT);
          if (e == 0) {
            rv = printf("\t\t\t\t<input type=\"hidden\" name=\"deck-name\" value=\"%s\">\n", wms->html_lp);
            e = rv < 0;
          }
        }
        break;
      case B_HIDDEN_SEARCH_TXT:
        if (wms->ms.search_txt != NULL && strlen(wms->ms.search_txt) > 0) {
          e = xml_escape(&wms->html_lp, &wms->html_n, wms->ms.search_txt, ESC_AMP | ESC_QUOT);
          if (e == 0) {
            rv = printf("\t\t\t\t<input type=\"hidden\" name=\"search-txt\" value=\"%s\">\n", wms->html_lp);
            e = rv < 0;
          }
        }
        break;
      case B_HIDDEN_MOV_CARD:
        if (wms->ms.mov_card_i >= 0) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"mov-card\" value=\"%d\">\n", wms->ms.mov_card_i);
          e = rv < 0;
        }
        break;
      case B_CLOSE_DIV:
        if ((wms->page == P_PREVIEW || (wms->page == P_LEARN && wms->mode == M_RATE)) && e == 0) {
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"q\" value=\"\">\n"
                      "\t\t\t\t<input type=\"hidden\" name=\"a\" value=\"\">\n");
          e = rv < 0;
        }
        if (e == 0) {
          rv = printf("\t\t\t</div>\n");
          e = rv < 0;
        }
        break;
      case B_START:
        dis_str = wms->file_title_str != NULL ? "" : " disabled";
        attr_str = wms->ms.n_first != -1 ? "" : " disabled";
        rv = printf("\t\t\t<h1 class=\"msf\">Start</h1>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"File\">File</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Decks\"%s>Decks</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Edit\"%s>Edit</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Learn\"%s>Learn</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Search\"%s>Search</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Preferences\"%s>Preferences</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"About\">About</button></div>\n"
                    "\t\t</form>\n"
                    "\t\t<code class=\"msf\">%s</code>\n"
                    "\t</body>\n"
                    "</html>\n",
            dis_str,
            attr_str,
            attr_str,
            attr_str,
            dis_str,
            sw_info_str);
        e = rv < 0;
        break;
      case B_FILE:
        if (wms->file_title_str != NULL) {
          dis_str = "";
        } else {
          dis_str = " disabled";
        }
        rv = printf("\t\t\t<h1 class=\"msf\">File</h1>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"New\"%s>New</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Open\"%s>Open</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Password\"%s>Password</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Import\"%s>Import</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Export\"%s>Export</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Remove\"%s>Remove</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Erase\"%s>Erase</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Close\"%s>Close</button></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Cancel\">Cancel</button></div>\n"
                    "\t\t</form>\n"
                    "\t\t<code class=\"msf\" >%s</code>\n"
                    "\t</body>\n"
                    "</html>\n",
            wms->file_title_str == NULL ? "" : " disabled",
            wms->file_title_str == NULL && wms->fl_c > 0 ? "" : " disabled",
            dis_str,
            dis_str,
            wms->file_title_str != NULL && wms->ms.n_first != -1 ? "" : " disabled",
            dis_str,
            wms->file_title_str != NULL && wms->ms.n_first != -1 ? "" : " disabled",
            dis_str,
            sw_info_str);
        e = rv < 0;
        break;
      case B_PASSWORD:
        assert(wms->ms.passwd.pw_flag >= 0);
        header_str = NULL;
        notice_str = NULL;
        x = 0;
        y = 0;
        if (wms->ms.passwd.pw_flag > 0) {
          x = 1;
          if (wms->mode != M_CHANGE_PASSWD) {
            header_str = "Enter the password to login";
            submit_str = "Login";
          } else {
            assert(wms->seq == S_GO_CHANGE);
            header_str = "Change password";
            notice_str = "Enter the current password";
            submit_str = "Change";
            y = 1;
          }
        } else {
          assert(wms->ms.passwd.pw_flag == 0);
          header_str = "Define password";
          notice_str = "Define a (initial) password (for this file) (may be empty)";
          submit_str = "Enter";
          y = 1;
        }
        assert(wms->mode != M_NONE && header_str != NULL);
        printf("\t\t\t<h1 class=\"msf\">%s</h1>\n", header_str);
        if (notice_str != NULL) printf("\t\t\t<p class=\"msf\">%s</p>\n", notice_str);
        if (x != 0) printf("\t\t\t<div class=\"msf-btns\"><input type=\"text\" name=\"password\" value=\"\" size=25></div>\n");
        if (wms->mode == M_CHANGE_PASSWD && e == 0) {
          rv = printf("\t\t\t<p class=\"msf\">Enter a new password</p>\n");
          e = rv < 0;
        }
        if (y != 0) printf("\t\t\t<div class=\"msf-btns\"><input type=\"text\" name=\"new-password\" value=\"\" size=25></div>\n");
        if (e == 0) {
          rv = printf("\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"%s\">%s</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button></div>\n"
                      "\t\t</form>\n"
                      "\t</body>\n"
                      "</html>\n",
              submit_str,
              submit_str);
          e = rv < 0;
        }
        break;
      case B_NEW:
        assert(wms->seq == S_NEW);
        size = 14; // 'new-9999.imsf\0'
        str = malloc(size);
        e = str == NULL;
        if (e == 0) {
          i = 0;
          do {
            if (i > 0) {
              rv = snprintf(str, size, "new-%d.imsf", i);
            } else
              rv = snprintf(str, size, "new.imsf");
            e = rv < 0 || rv >= size;
            if (e == 0) {
              x = 0;
              for (j = 0; x == 0 && j < wms->fl_c; j++)
                x = strcmp(wms->fl_v[j], str) == 0;
              i++;
              e = i > 9999;
            }
          } while (e == 0 && x == 1);
          if (e == 0) {
            ext_str = rindex(str, '.');
            assert(ext_str != NULL);
            *ext_str = '\0';
            rv = printf("\t\t\t<h1 class=\"msf\">Create a New file</h1>\n"
                        "\t\t\t<div class=\"msf-btns\"><input type=\"text\" name=\"file-title\" value=\"%s\" size=25>.imsf</div>\n"
                        "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Create\">Create</button>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button></div>\n"
                        "\t\t</form>\n"
                        "\t\t<code class=\"msf\">%s</code>\n"
                        "\t</body>\n"
                        "</html>\n",
                str,
                sw_info_str);
            e = rv < 0;
          }
          free(str);
        }
        break;
      case B_OPEN:
        rv = printf("\t\t\t<h1 class=\"msf\">Open file</h1>\n"
                    "\t\t\t<ul class=\"msf\">\n");
        e = rv < 0;
        for (i = 0; e == 0 && i < wms->fl_c; i++) {
          e = xml_escape(&wms->html_lp, &wms->html_n, wms->fl_v[i], ESC_AMP | ESC_QUOT);
          if (e == 0) {
            rv = printf("\t\t\t\t<li><label class=\"msf-td\"><input type=\"radio\" name=\"file-title\" value=\"%s\">", wms->html_lp);
            e = rv < 0;
            if (e == 0) {
              e = xml_escape(&wms->html_lp, &wms->html_n, wms->fl_v[i], ESC_AMP | ESC_LT);
              rv = printf("%s</label></li>\n", wms->html_lp);
              e = rv < 0;
            }
          }
        }
        rv = printf("\t\t\t</ul>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Open\"%s>Open</button>\n"
                    "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Cancel\">Cancel</button></div>\n"
                    "\t\t</form>\n"
                    "\t\t<code class=\"msf\">%s</code>\n"
                    "\t</body>\n"
                    "</html>\n",
            wms->fl_c > 0 ? "" : " disabled",
            sw_info_str);
        e = rv < 0;
        break;
      case B_UPLOAD:
        assert(wms->file_title_str != NULL && strlen(wms->tok_str) == 40);
        rv = printf("\t\t\t<h1 class=\"msf\">Upload</h1>\n"
                    "\t\t\t<p class=\"msf\">Choose a (previously exported .XML) File to upload (which will be used for the Import)</p>\n"
                    "\t\t\t<div class=\"msf-btns\"><input type=\"file\" name=\"upload\"></div>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Upload\">Upload</button>\n"
                    "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button></div>\n"
                    "\t\t</form>\n"
                    "\t</body>\n"
                    "</html>\n");
        e = rv < 0;
        break;
      case B_UPLOAD_REPORT:
        rv = printf("\t\t\t<h1 class=\"msf\">XML File imported</h1>\n"
                    "\t\t\t<p class=\"msf\">%d card(s) in %d deck(s) imported</p>\n",
            wms->card_n,
            wms->deck_n);
        e = rv < 0;
        if (e == 0) {
          if (wms->posted_message_digest != NULL) {
            print_hex(digest_str, wms->posted_message_digest, SHA1_HASH_SIZE);
            rv = printf("\t\t\t<p class=\"msf\">sha1 = %s</p>\n", digest_str);
            e = rv < 0;
          }
          if (e == 0) {
            rv = printf("\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"OK\">OK</button></div>\n"
                        "\t\t</form>\n"
                        "\t\t<code class=\"msf\">%s; chunks=%d, swaps=%d, avg=%d</code>\n"
                        "\t</body>\n"
                        "</html>\n",
                sw_info_str,
                wms->ms.imf.chunk_count,
                wms->ms.imf.stat_swap,
                wms->ms.imf.stat_swap / wms->ms.imf.chunk_count);
            e = rv < 0;
          }
        }
        break;
      case B_EXPORT:
        size = strlen(DATA_PATH) + 17; // + '/' + 9999999999 + . + temp + '\0'
        temp_filename = malloc(size);
        e = temp_filename == NULL;
        if (e == 0) {
          rv = snprintf(temp_filename, size, "%s/%ld.temp", DATA_PATH, wms->ms.timestamp);
          e = rv < 0 || rv >= size;
          if (e == 0) {
            temp_stream = fopen(temp_filename, "w");
            e = temp_stream == NULL;
            if (e == 0) {
              xg.w_stream = temp_stream; // stdout
              rv = fputs("<memorysurfer>", xg.w_stream);
              e = rv == EOF;
              if (e == 0) {
                e = inds_set(wms->inds, 1, 0);
                if (e == 0) {
                  xg.w_lineptr = NULL;
                  xg.w_n = 0;
                  if (wms->ms.n_first != -1) {
                    e = gen_xml_category(wms->ms.n_first, &xg, &wms->ms, wms->inds);
                  }
                  if (e == 0) {
                    rv = fputs("</memorysurfer>", xg.w_stream);
                    e = rv == EOF;
                  }
                  free(xg.w_lineptr);
                }
              }
              rv = fclose(temp_stream);
              if (e == 0) {
                e = rv != 0 ? E_EXPOR_1 : 0;
              }
            }
            if (e == 0) {
              e = sha1_reset(&sha1);
              if (e == 0) {
                temp_stream = fopen(temp_filename, "r");
                e = temp_stream == NULL;
                if (e == 0) {
                  do {
                    len = fread(wms->html_lp, 1, wms->html_n, temp_stream);
                    e = len == 0 && ferror(temp_stream) != 0;
                    if (len > 0 && e == 0) {
                      e = sha1_input(&sha1, (uint8_t*)wms->html_lp, len);
                    }
                  } while (feof(temp_stream) == 0 && e == 0);
                  if (e == 0) {
                    e = sha1_result(&sha1, message_digest);
                  }
                  rv = fclose(temp_stream);
                  if (e == 0) {
                    e = rv != 0 ? E_EXPOR_2 : 0;
                  }
                }
              }
            }
            if (e == 0) {
              temp_stream = fopen(temp_filename, "r");
              e = temp_stream == NULL;
              if (e == 0) {
                e = wms->file_title_str == NULL;
                if (e == 0) {
                  dup_str = strdup(wms->file_title_str);
                  e = dup_str == NULL;
                  if (e == 0) {
                    len = strlen(dup_str);
                    e = len <= 5;
                    if (e == 0) {
                      ext_str = strrchr(dup_str, '.');
                      e = ext_str == NULL || ext_str - dup_str != len - 5 || strcmp(ext_str, ".imsf") != 0;
                      if (e == 0) {
                        *ext_str = '\0';
                        print_hex(digest_str, message_digest, SHA1_HASH_SIZE);
                        rv = printf("Content-Disposition: attachment; filename=\"%s#sha1-%s.xml\"\r\n"
                                    "Content-Type: application/xml; charset=utf-8\r\n\r\n",
                            dup_str, digest_str);
                        e = rv < 0;
                        if (e == 0) {
                          do {
                            len = fread(wms->html_lp, 1, wms->html_n, temp_stream);
                            e = len == 0 && ferror(temp_stream) != 0;
                            if (len > 0 && e == 0) {
                              size = fwrite(wms->html_lp, 1, len, stdout);
                              e = size != len;
                            }
                          } while (feof(temp_stream) == 0 && e == 0);
                        }
                      }
                    }
                    free(dup_str);
                  }
                }
                rv = fclose(temp_stream);
                if (e == 0) {
                  e = rv != 0 ? E_EXPOR_3 : 0;
                }
              }
            }
          }
          free(temp_filename);
        }
        break;
      case B_SELECT_ARRANGE:
        assert(wms->file_title_str != NULL && strlen(wms->tok_str) == 40);
        if (wms->seq == S_DECKS_CREATE) {
          submit_str = "Select";
          text_str = "the deck to create";
        } else if (wms->seq == S_SELECT_MOVE_ARRANGE) {
          assert(wms->ms.mov_deck_i >= 0);
          submit_str = "Move";
          text_str = "the deck to move";
        } else {
          assert(wms->seq == S_CARD_ARRANGE);
          submit_str = "Move";
          text_str = "the card to move";
        }
        rv = printf("\t\t\t<h1 class=\"msf\">Select how to arrange %s</h1>\n"
                    "\t\t\t<div class=\"msf-btns\">\n",
            text_str);
        e = rv < 0;
        if (e == 0) {
          for (i = 0; i < 3 && e == 0; i++)
            if (wms->mode != M_CARD || i != 1) {
              rv = printf("\t\t\t\t<label class=\"msf-div\"><input type=\"radio\" name=\"arrange\" value=\"%d\"%s>%s</label>\n",
                  i,
                  i == wms->ms.arrange ? " checked" : "",
                  ARRANGE[i]);
              e = rv < 0;
            }
          if (e == 0) {
            rv = printf("\t\t\t</div>\n"
                        "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"%s\">%s</button>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button></div>\n"
                        "\t\t</form>\n"
                        "\t\t<code class=\"msf\">%s</code>\n"
                        "\t</body>\n"
                        "</html>\n",
                submit_str,
                submit_str,
                sw_info_str);
            e = rv < 0;
          }
        }
        break;
      case B_DECK_NAME:
        assert(wms->file_title_str != NULL && strlen(wms->tok_str) == 40);
        if (wms->seq == S_DECK_NAME || wms->seq == S_DECKS_CREATE) {
          header_str = "Enter the name of the deck to create.";
          text_str = wms->ms.deck_name_str != NULL ? wms->ms.deck_name_str : "";
          submit_str = "Create";
        } else {
          assert(wms->seq == S_DECKS_RENAME && wms->ms.deck_i >= 0 && wms->ms.deck_i < wms->ms.deck_a);
          header_str = "Enter the name to rename the deck to.";
          text_str = sa_get(&wms->ms.deck_sa, wms->ms.deck_i);
          e = text_str == NULL;
          submit_str = "Rename";
        }
        if (e == 0) {
          e = xml_escape(&wms->html_lp, &wms->html_n, text_str, ESC_AMP | ESC_QUOT);
          if (e == 0) {
            rv = printf("\t\t\t<h1 class=\"msf\">%s</h1>\n"
                        "\t\t\t<div class=\"msf-btns\"><input type=\"text\" name=\"deck-name\" value=\"%s\" size=25 placeholder=\"Enter deck name here...\"></div>\n"
                        "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"%s\">%s</button>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button></div>\n"
                        "\t\t</form>\n"
                        "\t\t<code class=\"msf\">%s</code>\n"
                        "\t</body>\n"
                        "</html>\n",
                header_str,
                wms->html_lp,
                submit_str,
                submit_str,
                sw_info_str);
            e = rv < 0;
          }
        }
        break;
      case B_STYLE:
        str = sa_get(&wms->ms.style_sa, wms->ms.deck_i);
        e = xml_escape(&wms->html_lp, &wms->html_n, str, ESC_AMP | ESC_LT);
        if (e == 0) {
          rv = printf("\t\t\t<h1 class=\"msf\">Style</h1>\n"
                      "\t\t\t<p class=\"msf\">Define the (inline) &lt;style&gt; for this deck (and it's cards).</p>\n"
                      "\t\t\t<div class=\"msf-txtarea\"><textarea class=\"msf\" name=\"style-txt\" rows=\"10\" placeholder=\"div.qa-txt { font-family: serif; }\ndiv.qa-html { background-color: #ffe; }\ndiv#a-html { text-align: center; }\ndiv#q-txt { color: #888; }\n/* ... */\">%s</textarea></div>\n"
                      "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Apply\">Apply</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button></div>\n"
                      "\t\t</form>\n"
                      "\t\t<code class=\"msf\">%s</code>\n"
                      "\t</body>\n"
                      "</html>\n",
              wms->html_lp,
              sw_info_str);
          e = rv < 0;
        }
        break;
      case B_SELECT_DEST_DECK:
        assert(wms->file_title_str != NULL && strlen(wms->tok_str) == 40);
        assert(wms->seq == S_EDITING_SEND || wms->seq == S_SELECT_DEST_CAT || wms->seq == S_SELECT_PROCEED_SEND);
        assert(wms->ms.mov_deck_i >= 0);
        switch (wms->mode) {
        case M_SEND:
          header_str = "Sending";
          notice_str = "to move the card to";
          submit_str = "Send";
          break;
        case M_PROCEED_SEND:
          header_str = "Proceed &amp; Send";
          notice_str = "to move the rated card to";
          submit_str = "Send";
          break;
        case M_MOVE:
          header_str = "Moving";
          notice_str = "where to move";
          submit_str = "Select";
          break;
        default:
          e = E_GHTML_1; // unexpected mode B_SELECT_DEST_DECK
          break;
        }
        if (e == 0) {
          assert(strlen(mtime_str) == 16);
          rv = printf("\t\t\t<h1 class=\"msf\">%s</h1>\n", header_str);
          e = rv < 0;
          if (e == 0) {
            rv = printf("\t\t\t<p class=\"msf\">Select the deck %s</p>\n", notice_str);
            e = rv < 0;
          }
          if (e == 0) {
            e = inds_set(wms->inds, 3, 0);
            if (e == 0) {
              e = gen_html_deck(wms->ms.n_first, H_CHILD, wms, Y_RADIO);
              if (e == 0) {
                rv = printf("\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"%s\">%s</button>\n"
                            "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button></div>\n"
                            "\t\t</form>\n"
                            "\t\t<code class=\"msf\">%s</code>\n"
                            "\t</body>\n"
                            "</html>\n",
                    submit_str,
                    submit_str,
                    sw_info_str);
                e = rv < 0;
              }
            }
          }
        }
        break;
      case B_SELECT_DECK:
        sel_type = Y_RADIO;
        e = wms->file_title_str == NULL || strlen(wms->tok_str) != 40;
        if (e == 0) {
          j = 0;
          switch (wms->mode) {
          case M_EDIT:
            header_str = "Select a category to edit";
            break;
          case M_LEARN:
            header_str = "Select a category to learn";
            j = 1;
            sel_type = Y_CHECKBOX;
            break;
          case M_SEARCH:
            header_str = "Select a category to search";
            j = 2;
            break;
          case M_START:
            header_str = "Select a deck (if possible) and / or a action";
            break;
          default:
            e = E_GHTML_2; // unexpected mode B_SELECT_DECK
            break;
          }
          if (e == 0) {
            rv = printf("\t\t\t<h1 class=\"msf\">%s</h1>\n", header_str);
            e = rv < 0;
            if (e == 0) {
              dis_str = wms->ms.n_first >= 0 ? "" : " disabled";
              if (wms->mode == M_START) {
                rv = printf("\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Create\">Create</button>\n"
                            "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Rename\"%s>Rename</button>\n"
                            "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Move\"%s>Move</button>\n"
                            "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Delete\"%s>Delete</button>\n"
                            "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Toggle\"%s>Toggle</button></div>\n",
                    dis_str,
                    dis_str,
                    dis_str,
                    dis_str);
                e = rv < 0;
              }
              if (e == 0) {
                e = inds_set(wms->inds, 3, 0);
                if (e == 0) {
                  e = gen_html_deck(wms->ms.n_first, H_CHILD, wms, sel_type);
                }
              }
              if (e == 0) {
                rv = printf("\t\t\t<div class=\"msf-btns\">");
                e = rv < 0;
                for (i = 0; i < 3 && e == 0; i++) {
                  k = (i + j) % 3;
                  rv = printf("%s<button class=\"msf\" type=\"submit\" name=\"event\" value=\"%s\"%s>%s</button>\n",
                      i > 0 ? "\t\t\t\t" : "",
                      event_str[k],
                      dis_str,
                      event_str[k]);
                  e = rv < 0;
                }
                if (e == 0) {
                  rv = printf("\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Cancel\">Cancel</button></div>\n"
                              "\t\t</form>\n"
                              "\t\t<code class=\"msf\">%s</code>\n"
                              "\t</body>\n"
                              "</html>\n",
                      sw_info_str);
                  e = rv < 0;
                }
              }
            }
          }
        }
        break;
      case B_EDIT:
        q_str = sa_get(&wms->ms.card_sa, 0);
        a_str = sa_get(&wms->ms.card_sa, 1);
        e = xml_escape(&wms->html_lp, &wms->html_n, q_str, ESC_AMP | ESC_LT);
        if (e == 0) {
          n = 0;
          assert(wms->ms.deck_a > 0);
          for (i = 0; i < wms->ms.deck_a && n < 2; i++) {
            n += wms->ms.cat_t[i].deck_slot_used != 0;
          }
          assert(strlen(mtime_str) == 16 && wms->file_title_str != NULL && strlen(wms->tok_str) == 40);
          rv = printf("\t\t\t<h1 class=\"msf\">Editing</h1>\n"
                      "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Insert\"%s>Insert</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Append\">Append</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Delete\"%s>Delete</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Previous\"%s>Previous</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Next\"%s>Next</button></div>\n"
                      "\t\t\t<div class=\"msf-txtarea\"><textarea class=\"msf\" name=\"q\" rows=\"10\"%s%s>%s</textarea></div>\n"
                      "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Schedule\"%s>Schedule</button>\n"
                      "\t\t\t\t<span class=\"msf-space\"></span>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Set\"%s>Set</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Move\"%s>Move</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Send\"%s>Send</button></div>\n",
              wms->ms.card_a > 0 ? "" : " disabled",
              wms->ms.card_a > 0 ? "" : " disabled",
              wms->ms.card_a > 0 && wms->ms.card_i > 0 ? "" : " disabled",
              wms->ms.card_a > 0 && wms->ms.card_i + 1 < wms->ms.card_a ? "" : " disabled",
              q_str != NULL && q_str[0] == '\0' ? " placeholder=\"Type question here...\"" : "",
              q_str != NULL ? "" : " disabled",
              wms->html_lp,
              wms->ms.card_i >= 0 && wms->ms.card_a > 0 && wms->ms.card_i < wms->ms.card_a && (wms->ms.card_l[wms->ms.card_i].card_state & 0x07) >= STATE_NEW ? "" : " disabled",
              wms->ms.card_i != wms->ms.mov_card_i ? "" : " disabled",
              wms->ms.mov_card_i != -1 && wms->ms.card_i != wms->ms.mov_card_i ? "" : " disabled",
              wms->ms.card_i != -1 && n > 1 ? "" : " disabled");
          e = rv < 0;
          if (e == 0) {
            e = xml_escape(&wms->html_lp, &wms->html_n, a_str, ESC_AMP | ESC_LT);
            if (e == 0) {
              rv = printf("\t\t\t<div class=\"msf-txtarea\"><textarea class=\"msf\" name=\"a\" rows=\"10\"%s%s>%s</textarea></div>\n"
                          "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Learn\"%s>Learn</button>\n"
                          "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Search\"%s>Search</button>\n"
                          "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Preview\"%s>Preview</button>\n"
                          "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button>\n"
                          "\t\t\t\t<label class=\"msf-div\"><input type=\"checkbox\" name=\"is-html\"%s>HTML</label></div>\n",
                  a_str != NULL && a_str[0] == '\0' ? " placeholder=\"Type answer here...\"" : "",
                  a_str != NULL ? "" : " disabled",
                  wms->html_lp,
                  wms->ms.card_a > 0 ? "" : " disabled",
                  wms->ms.card_a > 0 ? "" : " disabled",
                  wms->ms.card_a > 0 ? "" : " disabled",
                  wms->ms.card_i >= 0 && wms->ms.card_a > 0 && wms->ms.card_i < wms->ms.card_a && (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? " checked" : "");
              e = rv < 0;
              if (e == 0) {
                imf_info_swaps(&wms->ms.imf);
                rv = printf("\t\t</form>\n"
                            "\t\t<code class=\"msf\">%s; chunks=%d, swaps=%d, avg=%d</code>\n"
                            "\t</body>\n"
                            "</html>\n",
                    sw_info_str,
                    wms->ms.imf.chunk_count,
                    wms->ms.imf.stat_swap,
                    wms->ms.imf.stat_swap / wms->ms.imf.chunk_count);
                e = rv < 0;
              }
            }
          }
        }
        break;
      case B_PREVIEW:
        q_str = sa_get(&wms->ms.card_sa, 0);
        a_str = sa_get(&wms->ms.card_sa, 1);
        e = q_str == NULL || a_str == NULL || strlen(mtime_str) != 16 || wms->file_title_str == NULL || strlen(wms->tok_str) != 40;
        if (e == 0) {
          e = xml_escape(&wms->html_lp, &wms->html_n, q_str, (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? 0 : ESC_AMP | ESC_LT);
          if (e == 0) {
            rv = printf("\t\t\t<h1 class=\"msf\">Preview</h1>\n"
                        "\t\t\t<div class=\"msf-btns msf-anchor\"><input id=\"msf-unlock\" type=\"checkbox\" name=\"is-unlocked\"%s>\n"
                        "\t\t\t<label class=\"msf-div\" for=\"msf-unlock\">Unlock</label>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Style\">Style</button>\n"
                        "\t\t\t\t<button id=\"msf-surround\" class=\"msf\" type=\"button\" disabled>Surround</button>\n"
                        "\t\t\t\t<button id=\"msf-unformat-btn\" class=\"msf\" type=\"button\" disabled>Unformat</button>\n"
                        "\t\t\t\t<button id=\"msf-br\" class=\"msf\" type=\"button\" disabled>&lt;br&gt;</button>\n"
                        "\t\t\t\t<div id=\"msf-inl-dlg\" class=\"msf-dlg\">\n"
                        "\t\t\t\t\t<h1 class=\"msf\">Surround Node</h1>\n"
                        "\t\t\t\t\t<select id=\"msf-format-inline\">\n"
                        "\t\t\t\t\t\t<option value=\"DIV\">&lt;div&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"P\">&lt;p&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"PRE\">&lt;pre&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"BLOCKQUOTE\">&lt;blockquote&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"SPAN\">&lt;span&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"CODE\">&lt;code&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"EM\">&lt;em&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"MARK\">&lt;mark&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"STRONG\">&lt;strong&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"CITE\">&lt;cite&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"I\">&lt;i&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"B\">&lt;b&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"U\">&lt;u&gt;</option>\n"
                        "\t\t\t\t\t</select>\n"
                        "\t\t\t\t\t<div class=\"msf-btns\"><button id=\"msf-inl-apply\" class=\"msf\" type=\"button\">Apply</button>\n"
                        "\t\t\t\t\t\t<button id=\"msf-inl-cancel\" class=\"msf\" type=\"button\">Cancel</button></div>\n"
                        "\t\t\t\t</div>\n"
                        "\t\t\t</div>\n"
                        "\t\t\t<div id=\"%s\" class=\"%s\">%s</div>\n",
                wms->ms.card_i >= 0 && wms->ms.card_a > 0 && wms->ms.card_i < wms->ms.card_a && (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? "" : " disabled",
                (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? "q-html" : "q-txt",
                (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? "qa-html" : "qa-txt",
                wms->html_lp);
            e = rv < 0;
          }
        }
        if (e == 0) {
          e = xml_escape(&wms->html_lp, &wms->html_n, a_str, (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? 0 : ESC_AMP | ESC_LT);
          if (e == 0) {
            rv = printf("\t\t\t<div id=\"%s\" class=\"%s\">%s</div>\n",
                (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? "a-html" : "a-txt",
                (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? "qa-html" : "qa-txt",
                wms->html_lp);
            e = rv < 0;
          }
        }
        if (e == 0) {
          rv = printf("\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Edit\">Edit</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Learn\">Learn</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Search\">Search</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button></div>\n");
          e = rv < 0;
        }
        if (e == 0) {
          rv = printf("\t\t</form>\n"
                      "\t\t<code class=\"msf\">%s; neli: %d</code>\n"
                      "\t</body>\n"
                      "</html>\n",
              sw_info_str,
              wms->ms.cards_nel);
          e = rv < 0 ? E_GHTML_3 : 0;
        }
        break;
      case B_SEARCH:
        e = xml_escape(&wms->html_lp, &wms->html_n, wms->ms.search_txt, ESC_AMP | ESC_QUOT);
        if (e == 0) {
          assert(wms->file_title_str != NULL && strlen(wms->tok_str) == 40);
          assert(wms->ms.match_case == -1 || wms->ms.match_case == 1);
          rv = printf("\t\t\t<h1 class=\"msf\">Searching</h1>\n"
                      "\t\t\t<div class=\"msf-btns\"><input class=\"msf\" type=\"text\" name=\"search-txt\" value=\"%s\" size=25>\n"
                      "\t\t\t\t<label class=\"msf-div\"><input type=\"checkbox\" name=\"match-case\"%s>Match&nbsp;Case</label></div>\n",
              wms->html_lp,
              wms->ms.match_case > 0 ? " checked" : "");
          e = rv < 0;
          if (e == 0) {
            q_str = sa_get(&wms->ms.card_sa, 0);
            a_str = sa_get(&wms->ms.card_sa, 1);
            e = xml_escape(&wms->html_lp, &wms->html_n, q_str, ESC_AMP | ESC_LT);
            if (e == 0) {
              rv = printf("\t\t\t<div class=\"msf-txtarea\"><textarea class=\"msf\" rows=\"10\"%s>%s</textarea></div>\n"
                          "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Reverse\"%s>Reverse</button>\n"
                          "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Forward\"%s>Forward</button>\n"
                          "\t\t\t\t<span class=\"msf-space\"></span>\n",
                  wms->found_str != NULL ? " readonly" : " disabled",
                  wms->html_lp,
                  wms->ms.card_a > 0 || wms->ms.scope == C_ALL ? "" : " disabled",
                  wms->ms.card_a > 0 || wms->ms.scope == C_ALL ? "" : " disabled");
              e = rv < 0;
              j = wms->ms.scope >= C_CURRENT && wms->ms.scope <= C_ALL ? wms->ms.scope : 0;
              for (i = C_CURRENT; i <= C_ALL && e == 0; i++) {
                if (i != C_CHECKED) {
                  rv = printf("\t\t\t\t<input id=\"msf-scope-%d\" type=\"radio\" name=\"scope\" value=\"%d\"%s%s>\n"
                              "\t\t\t\t<label class=\"msf-div\" for=\"msf-scope-%d\">%s</label>\n",
                      i, i,
                      i == j ? " checked" : "",
                      i == 1 ? " disabled" : "",
                      i, SCOPE[i]);
                  e = rv < 0;
                }
              }
              if (e == 0) {
                e = xml_escape(&wms->html_lp, &wms->html_n, a_str, ESC_AMP | ESC_LT);
                if (e == 0) {
                  rv = printf("\t\t\t</div>\n"
                              "\t\t\t<div class=\"msf-txtarea\"><textarea class=\"msf\" rows=\"10\"%s>%s</textarea></div>\n"
                              "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Edit\">Edit</button>\n"
                              "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Learn\"%s>Learn</button>\n"
                              "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button></div>\n"
                              "\t\t</form>\n"
                              "\t\t<code class=\"msf\">%s</code>\n"
                              "\t</body>\n"
                              "</html>\n",
                      wms->found_str != NULL ? " readonly" : " disabled",
                      wms->html_lp,
                      wms->ms.card_a > 0 ? "" : " disabled",
                      sw_info_str);
                  e = rv < 0;
                }
              }
            }
          }
        }
        break;
      case B_PREFERENCES:
        assert(wms->file_title_str != NULL && strlen(wms->tok_str) == 40);
        rv = printf("\t\t\t<h1 class=\"msf\">Preferences</h1>\n"
                    "\t\t\t<p class=\"msf\">Timeout</p>\n"
                    "\t\t\t<div>\n");
        e = rv < 0;
        if (e == 0) {
          j = -1;
          for (i = 0; i < 5 && j == -1; i++) {
            if (timeouts[i].to_sec * timeouts[i].to_count >= wms->ms.passwd.timeout.to_count * wms->ms.passwd.timeout.to_sec) {
              j = i;
            }
          }
          if (j == -1) {
            j = 1;
          }
          for (i = 0; i < 5 && e == 0; i++) {
            attr_str = i == j ? " checked" : "";
            rv = printf("\t\t\t\t<label class=\"msf-td\"><input type=\"radio\" name=\"timeout\" value=\"%d\"%s>%s</label>\n",
                i,
                attr_str,
                TIMEOUTS[i]);
            e = rv < 0;
          }
          if (e == 0) {
            rv = printf("\t\t\t</div>\n"
                        "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Apply\">Apply</button>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Cancel\">Cancel</button></div>\n"
                        "\t\t</form>\n"
                        "\t\t<code class=\"msf\">%s</code>\n"
                        "\t</body>\n"
                        "</html>\n",
                sw_info_str);
            e = rv < 0;
          }
        }
        break;
      case B_ABOUT:
        rv = printf("\t\t\t<h1 class=\"msf\">About <a href=\"https://www.lorenz-pullwitt.de/MemorySurfer/\">MemorySurfer</a> v%08x</h1>\n"
                    "\t\t\t<p class=\"msf\">Author: Lorenz Pullwitt</p>\n"
                    "\t\t\t<p class=\"msf\">Copyright 2016-2024</p>\n"
                    "\t\t\t<p class=\"msf\">Send bugs and suggestions to\n"
                    "<a href=\"mailto:memorysurfer@lorenz-pullwitt.de\">memorysurfer@lorenz-pullwitt.de</a></p>\n"
                    "\t\t\t<cite class=\"msf\">MemorySurfer is free software; you can redistribute it and/or\n"
                    "modify it under the terms of the GNU\302\240General\302\240Public\302\240License\n"
                    "as published by the Free\302\240Software\302\240Foundation; either version 2\n"
                    "of the License, or (at your option) any later version.</cite>\n"
                    "\t\t\t<cite class=\"msf\">This program is distributed in the hope that it will be useful,\n"
                    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
                    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n"
                    "<a href=\"https://www.gnu.org/licenses/\">GNU\302\240General\302\240Public\302\240License</a> for more details.</cite>\n"
                    "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"OK\">OK</button></div>\n"
                    "\t\t</form>\n"
                    "\t\t<code class=\"msf\">%s, PATH_MAX=%u</code>\n"
                    "\t</body>\n"
                    "</html>\n",
            MSF_VERSION,
            sw_info_str,
            PATH_MAX);
        e = rv < 0;
        break;
      case B_LEARN:
        q_str = sa_get(&wms->ms.card_sa, 0);
        a_str = sa_get(&wms->ms.card_sa, 1);
        e = q_str == NULL || a_str == NULL || strlen(mtime_str) != 16 || wms->file_title_str == NULL || strlen(wms->tok_str) != 40 || wms->ms.deck_path == NULL ? E_GHTML_4 : 0;
        if (e == 0) {
          if (wms->mode == M_ASK) {
            header_str = "Asking";
          } else {
            e = wms->mode != M_RATE ? E_GHTML_5 : 0;
            if (e == 0) {
              header_str = "Rating";
            }
          }
          if (e == 0) {
            rv = printf("\t\t\t<h1 class=\"msf\">%s</h1>\n"
                        "\t\t\t<div class=\"msf-btns msf-anchor\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Proceed\"%s>Proceed</button>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Show\"%s>Show</button>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Reveal\"%s>Reveal</button>\n"
                        "\t\t\t\t<span class=\"msf-space\"></span>\n"
                        "\t\t\t\t<input id=\"msf-unlock\" type=\"checkbox\" name=\"is-unlocked\"%s>\n"
                        "\t\t\t\t<label class=\"msf-div\" for=\"msf-unlock\">Unlock</label>\n"
                        "\t\t\t\t<button id=\"msf-menu\" class=\"msf\" type=\"button\">☰</button>\n"
                        "\t\t\t\t<div id=\"msf-data\" class=\"msf-dlg\">\n"
                        "\t\t\t\t\t<h1 class=\"msf\">Data Views</h1>\n"
                        "\t\t\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Histogram\">Histogram</button>\n"
                        "\t\t\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Table\">Table</button>\n"
                        "\t\t\t\t\t\t<span class=\"msf-space\"></span>\n"
                        "\t\t\t\t\t\t<input id=\"msf-tools-cbox\" type=\"checkbox\"%s>\n"
                        "\t\t\t\t\t\t<label class=\"msf-div\" for=\"msf-tools-cbox\">Tools</label></div>\n"
                        "\t\t\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"ProceedSend\" style=\"max-width:min-content;\"%s>Proceed&amp;Send</button>\n"
                        "\t\t\t\t\t\t<span class=\"msf-space\"></span>\n"
                        "\t\t\t\t\t\t<button id=\"msf-data-close\" class=\"msf\" type=\"button\">Close</button></div>\n"
                        "\t\t\t\t</div>\n"
                        "\t\t\t</div>\n"
                        "\t\t\t<div id=\"msf-tools\" class=\"msf-btns msf-anchor\" style=\"display: none;\"><button id=\"msf-surround\" class=\"msf\" type=\"button\" disabled>Surround</button>\n"
                        "\t\t\t\t<button id=\"msf-unformat-btn\" class=\"msf\" type=\"button\" disabled>Unformat</button>\n"
                        "\t\t\t\t<button id=\"msf-br\" class=\"msf\" type=\"button\" disabled>&lt;br&gt;</button>\n"
                        "\t\t\t\t<div id=\"msf-inl-dlg\" class=\"msf-dlg\">\n"
                        "\t\t\t\t\t<h1 class=\"msf\">Surround Node</h1>\n"
                        "\t\t\t\t\t<select id=\"msf-format-inline\">\n"
                        "\t\t\t\t\t\t<option value=\"DIV\">&lt;div&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"P\">&lt;p&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"PRE\">&lt;pre&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"BLOCKQUOTE\">&lt;blockquote&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"SPAN\">&lt;span&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"CODE\">&lt;code&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"EM\">&lt;em&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"MARK\">&lt;mark&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"STRONG\">&lt;strong&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"CITE\">&lt;cite&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"I\">&lt;i&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"B\">&lt;b&gt;</option>\n"
                        "\t\t\t\t\t\t<option value=\"U\">&lt;u&gt;</option>\n"
                        "\t\t\t\t\t</select>\n"
                        "\t\t\t\t\t<div class=\"msf-btns\"><button id=\"msf-inl-apply\" class=\"msf\" type=\"button\">Apply</button>\n"
                        "\t\t\t\t\t\t<button id=\"msf-inl-cancel\" class=\"msf\" type=\"button\">Cancel</button></div>\n"
                        "\t\t\t\t</div>\n"
                        "\t\t\t</div>\n",
                header_str,
                wms->mode != M_RATE ? " disabled" : "",
                wms->mode != M_ASK ? " disabled" : "",
                wms->mode != M_ASK ? " disabled" : "",
                wms->ms.card_i >= 0 && wms->ms.card_a > 0 && wms->ms.card_i < wms->ms.card_a && (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 && wms->mode == M_RATE ? "" : " disabled",
                wms->mode != M_RATE ? " disabled" : "",
                wms->mode != M_RATE ? " disabled" : "");
            e = rv < 0 ? E_GHTML_6 : 0;
          }
          if (e == 0) {
            e = xml_escape(&wms->html_lp, &wms->html_n, q_str, (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? 0 : ESC_AMP | ESC_LT) ? E_GENLRN_1 : 0;
            if (e == 0) {
              rv = printf("\t\t\t<div id=\"%s\" class=\"%s\">%s</div>\n"
                          "\t\t\t<table>\n",
                  (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? "q-html" : "q-txt",
                  (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? "qa-html" : "qa-txt",
                  wms->html_lp);
              e = rv < 0 ? E_GENLRN_2 : 0;
            }
          }
          if (e == 0) {
            if (wms->mode == M_ASK) {
              for (y = 0; y < 3 && e == 0; y++) {
                rv = printf ("\t\t\t\t<tr>\n");
                e = rv < 0 ? E_GENLRN_3 : 0;
                for (x = 0; x < 2 && e == 0; x++) {
                  rv = printf("\t\t\t\t\t<td class=\"msf-lvl\"><label class=\"msf-td\"><input type=\"radio\" disabled>Level</label></td>\n");
                  e = rv < 0 ? E_GENLRN_4 : 0;
                }
                if (e == 0) {
                  rv = printf("\t\t\t\t</tr>\n");
                  e = rv < 0 ? E_GENLRN_5 : 0;
                }
              }
            } else {
              assert(wms->ms.card_i != -1);
              if ((wms->ms.card_l[wms->ms.card_i].card_state & 0x07) == STATE_NEW) {
                time_diff = lvl_s[1];
                lvl = 0;
              } else {
                time_diff = wms->ms.timestamp - wms->ms.card_l[wms->ms.card_i].card_time;
                for (i = 0; i < 21; i++) {
                  if (lvl_s[i] >= wms->ms.card_l[wms->ms.card_i].card_strength)
                    break;
                }
                lvl = i;
              }
              j = lvl - 2;
              if (j < 0) {
                j = 0;
              }
              for (i = 0; i < 21; i++) {
                if (lvl_s[i] >= time_diff)
                  break;
              }
              lvl_sel = i;
              if (lvl_sel > j + 5) {
                lvl_sel = j + 5;
              }
              for (y = 0; y < 3 && e == 0; y++) {
                rv = printf("\t\t\t\t<tr>\n");
                e = rv < 0 ? E_GENLRN_6 : 0;
                assert(wms->html_n >= 19); // 8 + 10 + 1 " checked autofocus"
                for (x = 0; x < 2 && e == 0; x++) {
                  i = j + x + y * 2;
                  wms->html_lp[0] = '\0';
                  if (i == lvl) {
                    strcat(wms->html_lp, " checked");
                  }
                  if (i == lvl_sel) {
                    strcat(wms->html_lp, " autofocus");
                  }
                  set_time_str(time_diff_str, lvl_s[i]);
                  rv = printf("\t\t\t\t\t<td class=\"msf-lvl\"><label class=\"msf-td\"><input type=\"radio\" name=\"lvl\" value=\"%d\"%s>Level %d (%s)</label></td>\n",
                      i, wms->html_lp,
                      i, time_diff_str);
                  e = rv < 0 ? E_GENLRN_7 : 0;
                }
                if (e == 0) {
                  rv = printf("\t\t\t\t</tr>\n");
                  e = rv < 0 ? E_GENLRN_8 : 0;
                }
              }
            }
          }
          if (e == 0) {
            assert(wms->mode == M_ASK && wms->reveal_pos == -1 ? wms->ms.cards_nel >= 0 : 1);
            e = xml_escape(&wms->html_lp, &wms->html_n, a_str, (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? 0 : ESC_AMP | ESC_LT) ? E_GENLRN_9 : 0;
            if (e == 0) {
              rv = printf("\t\t\t</table>\n"
                          "\t\t\t<div id=\"%s\" class=\"%s\"%s>%s</div>\n",
                  (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? "a-html" : "a-txt",
                  (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0 ? "qa-html" : "qa-txt",
                  wms->mode == M_RATE || wms->reveal_pos > 0 ? "" : " style=\"background-color: #eee;\"",
                  wms->mode == M_RATE || wms->reveal_pos > 0 ? wms->html_lp : "");
              e = rv < 0 ? E_GHTML_7 : 0;
            }
          }
          if (e == 0) {
            time_diff = wms->ms.timestamp - wms->ms.card_l[wms->ms.card_i].card_time;
            set_time_str(time_diff_str, time_diff);
            rv = printf("\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Suspend\">Suspend</button>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Resume\"%s>Resume</button>\n"
                        "\t\t\t\t<span class=\"msf-space\"></span>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Edit\">Edit</button>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Search\">Search</button>\n"
                        "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Stop\">Stop</button></div>\n"
                        "\t\t</form>\n"
                        "\t\t<code class=\"msf\">path: %s; %s; neli: %d; mctr: %u; time_diff: %s</code>\n"
                        "\t</body>\n"
                        "</html>\n",
                wms->ms.can_resume != 0 ? "" : " disabled",
                wms->ms.deck_path,
                sw_info_str,
                wms->ms.cards_nel,
                wms->ms.passwd.mctr,
                time_diff_str);
            e = rv < 0 ? E_GHTML_8 : 0;
          }
        }
        break;
      case B_MSG:
        assert(wms->msg_header != NULL && wms->msg_btn_main != NULL);
        if (wms->mode == M_NONE) {
          assert(wms->todo_main >= S_FILE && wms->todo_main <= S_END);
          rv = printf("\t\t\t\t<input type=\"hidden\" name=\"todo_main\" value=\"%d\">\n", wms->todo_main);
          e = rv < 0;
        }
        if (e == 0) {
          rv = printf("\t\t\t</div>\n"
                      "\t\t\t<h1 class=\"msf\">%s</h1>\n",
              wms->msg_header);
          e = rv < 0;
          if (wms->msg_static != NULL && e == 0) {
            rv = printf("\t\t\t<p class=\"msf\">%s</p>\n", wms->msg_static);
            e = rv < 0;
          }
          if (e == 0) {
            rv = printf("\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"%s\">%s</button>\n",
                wms->msg_btn_main,
                wms->msg_btn_main);
            e = rv < 0;
          }
        }
        if (e == 0 && wms->msg_btn_alt != NULL) {
          rv = printf("\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"%s\">%s</button>\n",
              wms->msg_btn_alt,
              wms->msg_btn_alt);
          e = rv < 0;
        }
        if (e == 0) {
          rv = printf("\t\t\t</div>\n"
                      "\t\t</form>\n"
                      "\t\t<code class=\"msf\">%s</code>\n"
                      "\t</body>\n"
                      "</html>\n",
              sw_info_str);
          e = rv < 0;
        }
        break;
      case B_HISTOGRAM:
        vby = wms->hist_max;
        if (vby < 61)
          vby = 61;
        else if (vby > 121)
          vby = 121;
        wms->html_lp[0] = '\0';
        rv = snprintf(wms->html_lp, wms->html_n, "M1 %d", vby);
        e = rv < 0 || rv >= wms->html_n;
        if (e == 0) {
          n = rv;
          y = 0;
          dx = 0;
          for (i = 0; i < 100 && e == 0; i++) {
            dy = y - wms->hist_bucket[i];
            if (dy != 0) {
              if (dx > 0) {
                size = wms->html_n - n;
                rv = snprintf(wms->html_lp + n, size, "h%d", dx);
                e = rv < 0 || rv >= size;
                n += rv;
                dx = 0;
              }
              if (e == 0) {
                size = wms->html_n - n;
                rv = snprintf(wms->html_lp + n, size, "v%d", dy);
                e = rv < 0 || rv >= size;
                n += rv;
                y -= dy;
              }
            }
            dx++;
          }
          if (e == 0) {
            size = wms->html_n - n;
            rv = snprintf(wms->html_lp + n, size, "h%d", dx);
            e = rv < 0 || rv >= size;
            n += rv;
            if (e == 0) {
              if (y > 0) {
                size = wms->html_n - n;
                rv = snprintf(wms->html_lp + n, size, "v%d", y);
                e = rv < 0 || rv >= size;
                n += rv;
              }
              if (e == 0) {
                size = wms->html_n - n;
                rv = snprintf(wms->html_lp + n, size, "z");
                e = rv < 0 || rv >= size;
                n += rv;
              }
            }
          }
          if (e == 0) {
            e = imf_info_gaps(&wms->ms.imf);
            if (e == 0) {
              rv = printf("\t\t\t<h1 class=\"msf\">Histogram</h1>\n"
                          "\t\t\t<p class=\"msf\">Retention</p>\n"
                          "\t\t\t<svg class=\"msf\" viewbox=\"0 0 101 %d\">\n"
                          "\t\t\t\t<path d=\"%s\" />\n"
                          "\t\t\t</svg>\n"
                          "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Edit\">Edit</button>\n"
                          "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Learn\">Learn</button>\n"
                          "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Search\">Search</button>\n"
                          "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Refresh\">Refresh</button>\n"
                          "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Done\">Done</button></div>\n"
                          "\t\t</form>\n"
                          "\t\t<code class=\"msf\">%s; gaps=%d, gaps_size=%d, Details: %s, n=%d</code>\n"
                          "\t</body>\n"
                          "</html>\n",
                  vby + 1,
                  wms->html_lp,
                  sw_info_str,
                  wms->ms.imf.stats_gaps,
                  wms->ms.imf.stats_gaps_space,
                  wms->ms.imf.stats_gaps_str,
                  n);
              e = rv < 0;
            }
          }
        }
        break;
      case B_TABLE:
        rv = printf("\t\t\t<h1 class=\"msf\">Table</h1>\n"
                    "\t\t\t<p class=\"msf\">%d deck(s) checked (for learning).</p>\n"
                    "\t\t\t<table>\n"
                    "\t\t\t\t<thead>\n"
                    "\t\t\t\t\t<tr><td>Level</td><td>Strength</td><td>Cards</td><td>Eligible</td><td>Threshold</td></tr>\n"
                    "\t\t\t\t</thead>\n"
                    "\t\t\t\t<tbody>\n",
            wms->checked_decks);
        e = rv < 0;
        size = sizeof(el_str);
        for (i = 0; i < 21 && e == 0; i++) {
          set_time_str(time_diff_str, lvl_s[i]);
          if (wms->lvl_bucket[0][i] > 0) {
            j = 100 * wms->lvl_bucket[1][i] / wms->lvl_bucket[0][i];
            rv = snprintf(el_str, size, "%d%%", j);
            e = rv < 0 || rv >= size;
          } else
            strcpy(el_str, "n/a");
          if (!e) {
            rv = printf("\t\t\t\t\t<tr>"
                        "<td class=\"msf-str\"><label for=\"%d\">%d</label></td>"
                        "<td class=\"msf-str\"><label for=\"%d\"><code class=\"msf\">(%s)</code></label></td>"
                        "<td class=\"msf-str\"><label for=\"%d\">%d</label></td>"
                        "<td class=\"msf-str\"><label for=\"%d\">%s</label></td>"
                        "<td class=\"msf-str\"><input id=\"%d\" type=\"radio\" name=\"rank\" value=\"%d\"%s></td></tr>\n",
                i, i,
                i, time_diff_str,
                i, wms->lvl_bucket[0][i],
                i, el_str,
                i, i, i == wms->ms.passwd.rank ? " checked" : "");
            e = rv < 0;
          }
        }
        if (e == 0) {
          rv = printf("\t\t\t\t</tbody>\n"
                      "\t\t\t</table>\n"
                      "\t\t\t<div class=\"msf-btns\"><button class=\"msf\" type=\"submit\" name=\"event\" value=\"Edit\">Edit</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Learn\">Learn</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Search\">Search</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Refresh\">Refresh</button>\n"
                      "\t\t\t\t<button class=\"msf\" type=\"submit\" name=\"event\" value=\"Done\">Done</button></div>\n"
                      "\t\t</form>\n"
                      "\t\t<code class=\"msf\">%s; ",
              sw_info_str);
          e = rv < 0;
          if (e == 0) {
            for (i = 0; i < 4 && e == 0; i++) {
              rv = printf("%s: %d%s", state_str[i], wms->count_bucket[i], i < 3 ? ", " : "");
              e = rv < 0;
            }
            if (e == 0) {
              rv = printf("</code>\n"
                          "\t</body>\n"
                          "</html>\n");
              e = rv < 0;
            }
          }
        }
        break;
      default:
        e = E_GHTML_9;
        break;
      }
    }
    free(sw_info_str);
  }
  return e;
}

static int ms_init(struct MemorySurfer *ms)
{
  int e;
  size_t size;
  imf_init(&ms->imf);
  ms->imf_filename = NULL;
  sa_init(&ms->deck_sa);
  sa_init(&ms->style_sa);
  assert(sizeof(struct Deck) == 12);
  ms->cat_t = NULL;
  ms->deck_a = 0;
  ms->n_first = -1;
  ms->deck_path_z = 0;
  ms->deck_path = NULL;
  ms->deck_i = -1;
  ms->mov_deck_i = -1;
  ms->arrange = -1;
  ms->deck_name_str = NULL;
  ms->style_txt = NULL;
  ms->card_l = NULL;
  ms->card_a = 0;
  ms->card_i = -1;
  ms->mov_card_i = -1;
  ms->cards_nel = -1;
  sa_init(&ms->card_sa);
  ms->timestamp = time(NULL);
  e = ms->timestamp == -1;
  if (e == 0) {
    ms->lvl = -1;
    ms->rank = -1;
    ms->search_txt = NULL;
    ms->match_case = -1;
    ms->is_html = -1;
    ms->is_unlocked = -1;
    ms->search_dir = 0;
    ms->scope = C_UNDEF;
    ms->can_resume = 0;
    ms->password = NULL;
    ms->new_password = NULL;
    size = sizeof(ms->passwd.pw_msg_digest);
    memset(&ms->passwd.pw_msg_digest, -1, size);
    ms->passwd.pw_flag = -1;
    ms->passwd.timeout.to_sec = 0;
    ms->passwd.timeout.to_count = 0;
    ms->passwd.version = 0;
    ms->passwd.style_sai = -1;
    ms->passwd.mctr = 0;
    ms->passwd.rank = 4;
    ms->deck_flags = NULL;
    ms->deck_flags_n = 0;
  }
  return e;
}

static void inds_init(struct IndentStr *inds)
{
  inds->str = NULL;
  inds->size = 0;
  inds->indent_n = -1;
}

static int wms_init(struct WebMemorySurfer *wms)
{
  int e;
  size_t size;
  e = ms_init(&wms->ms);
  if (e == 0) {
    assert(A_END == 0);
    wms->seq = S_END;
    wms->page = P_START;
    wms->from_page = P_UNDEF;
    wms->mode = M_NONE;
    wms->saved_mode = M_NONE;
    wms->timeout = -1;
    wms->dbg_n = 720;
    wms->dbg_lp = malloc(wms->dbg_n);
    e = wms->dbg_lp == NULL ? E_MALLOC_1 : 0;
    if (e == 0) {
      wms->dbg_lp[0] = '\0';
      wms->dbg_wp = 0;
      wms->file_title_str = NULL;
      wms->fl_v = NULL;
      wms->fl_c = 0;
      sa_init(&wms->qa_sa);
      wms->reveal_pos = -1;
      wms->saved_reveal_pos = -1;
      wms->sw_i = -1;
      wms->msg_header = NULL;
      wms->msg_static = NULL;
      wms->msg_btn_main = NULL;
      wms->msg_btn_alt = NULL;
      wms->dyn_msg = NULL;
      wms->todo_main = -1;
      wms->html_n = 500;
      wms->html_lp = malloc(wms->html_n);
      e = wms->html_lp == NULL ? E_MALLOC_2 : 0;
      if (e == 0) {
        memset(wms->mtime, -1, sizeof(wms->mtime));
        memset(wms->tok_digest, -1, sizeof(wms->tok_digest));
        wms->tok_str[0] = '\0';
        size = sizeof(struct IndentStr);
        wms->inds = malloc(size);
        e = wms->inds == NULL ? E_MALLOC_3 : 0;
        if (e == 0) {
          inds_init(wms->inds);
          wms->temp_filename = NULL;
          wms->posted_message_digest = NULL;
        }
      }
    }
  }
  return e;
}

static void ms_free(struct MemorySurfer *ms)
{
  free(ms->deck_flags);
  ms->deck_flags = NULL;
  ms->deck_flags_n = 0;
  free(ms->imf_filename);
  sa_free(&ms->style_sa);
  sa_free(&ms->deck_sa);
  free(ms->cat_t);
  ms->cat_t = NULL;
  ms->deck_a = 0;
  free(ms->deck_path);
  ms->deck_path = NULL;
  ms->deck_path_z = 0;
  free(ms->style_txt);
  ms->style_txt = NULL;
  free(ms->deck_name_str);
  ms->deck_name_str = NULL;
  free(ms->card_l);
  ms->card_l = NULL;
  ms->card_a = 0;
  ms->card_i = -1;
  sa_free(&ms->card_sa);
  free(ms->search_txt);
  free(ms->password);
  free(ms->new_password);
  char b;
  b = imf_is_open(&ms->imf);
  if (b) {
    imf_close(&ms->imf);
  }
  sw_free(&ms->imf.sw);
}

static void inds_free(struct IndentStr *inds)
{
  free(inds->str);
  inds->str = NULL;
  inds->size = 0;
  inds->indent_n = -1;
}

static void wms_free(struct WebMemorySurfer *wms)
{
  int i;
  free(wms->posted_message_digest);
  wms->posted_message_digest = NULL;
  free(wms->temp_filename);
  wms->temp_filename = NULL;
  inds_free(wms->inds);
  free(wms->inds);
  wms->inds = NULL;
  free(wms->dyn_msg);
  wms->dyn_msg = NULL;
  free(wms->html_lp);
  for (i = 0; i < wms->fl_c; i++) {
    assert(wms->fl_v[i] != NULL);
    free(wms->fl_v[i]);
  }
  free(wms->fl_v);
  sa_free(&wms->qa_sa);
  free(wms->dbg_lp);
  free(wms->file_title_str);
  ms_free(&wms->ms);
}

static int ms_create(struct MemorySurfer *ms, int flags_mask)
{
  int e;
  size_t size;
  assert(ms->imf_filename != NULL);
  e = imf_create(&ms->imf, ms->imf_filename, flags_mask);
  if (e == 0) {
    e = imf_put(&ms->imf, SA_INDEX, "", 0);
    if (e == 0) {
      e = imf_put(&ms->imf, C_INDEX, "", 0);
      if (e == 0) {
        if (ms->passwd.pw_flag < 0) {
          ms->passwd.pw_flag = 0;
          assert(ms->passwd.timeout.to_sec == 0);
          ms->passwd.timeout.to_sec = timeouts[1].to_sec;
          assert(ms->passwd.timeout.to_count == 0);
          ms->passwd.timeout.to_count = timeouts[1].to_count;
        } else {
          assert(ms->passwd.pw_flag == 1);
        }
        size = sizeof(struct Password);
        e = imf_put(&ms->imf, PW_INDEX, &ms->passwd, size);
        if (e == 0) {
          e = imf_sync(&ms->imf);
        }
      }
    }
  }
  return e;
}

static int ms_get_card_sa(struct MemorySurfer *ms)
{
  int e;
  e = ms->card_a > 0 && ms->card_l == NULL ? E_ARG_1 : 0;
  if (e == 0 && ms->card_i != -1) {
    e = ms->card_i >= 0 && ms->card_i < ms->card_a ? 0 : E_ASSRT_2;
    if (e == 0) {
      e = sa_load(&ms->card_sa, &ms->imf, ms->card_l[ms->card_i].card_qai);
    }
  }
  return e;
}

static int ms_determine_heights(struct MemorySurfer *ms, int16_t *heights, int deck_i)
{
  int h_max;
  int h_tmp;
  h_max = 0;
  if (ms->cat_t[deck_i].n_child != -1) {
    h_tmp = ms_determine_heights(ms, heights, ms->cat_t[deck_i].n_child);
    if (h_max < h_tmp + 1) {
      h_max = h_tmp + 1;
    }
  }
  heights[deck_i] = h_max;
  if (ms->cat_t[deck_i].n_sibling != -1) {
    h_tmp = ms_determine_heights(ms, heights, ms->cat_t[deck_i].n_sibling);
    if (h_max < h_tmp) {
      h_max = h_tmp;
    }
  }
  return h_max;
}

static int ms_determine_card(struct MemorySurfer *ms)
{
  int e;
  int deck_i;
  int32_t data_size;
  time_t time_diff;
  int32_t card_strength_thr; // threshold
  double retent; // retention
  double reten_state[4];
  time_t state_time_diff[4];
  int sel_card[4]; // selected
  int sel_deck[4];
  enum CardState card_state;
  int card_i;
  int16_t *heights;
  int h_max;
  int h;
  size_t size;
  size = sizeof(int16_t) * ms->deck_a;
  heights = malloc(size);
  e = heights == NULL;
  if (e == 0) {
    h_max = ms_determine_heights(ms, heights, ms->n_first);
    assert(ms->timestamp >= 0);
    card_strength_thr = lvl_s[20];
    ms->cards_nel = 0;
    for (card_state = 0; card_state <= STATE_SUSPENDED; card_state++) {
      reten_state[card_state] = 1.0;
      state_time_diff[card_state] = INT32_MAX;
      sel_card[card_state] = -1;
      sel_deck[card_state] = -1;
    }
    for (h = 0; h <= h_max && (sel_card[STATE_SCHEDULED] == -1 || (sel_card[STATE_SCHEDULED] != -1 && card_strength_thr > lvl_s[ms->passwd.rank])) && sel_card[STATE_NEW] == -1 && sel_card[STATE_SUSPENDED] == -1; h++) {
      for (deck_i = 0; deck_i < ms->deck_a && e == 0; deck_i++) {
        if (ms->cat_t[deck_i].deck_slot_used == 1 && ms->cat_t[deck_i].deck_on != 0 && heights[deck_i] == h) {
          data_size = imf_get_size(&ms->imf, ms->cat_t[deck_i].cat_cli);
          if (data_size > 0) {
            ms->card_l = realloc(ms->card_l, data_size);
            e = ms->card_l == NULL;
            if (e == 0) {
              e = imf_get(&ms->imf, ms->cat_t[deck_i].cat_cli, ms->card_l);
              if (e == 0) {
                ms->card_a = data_size / sizeof(struct Card);
                assert(ms->card_a > 0);
                for (card_i = 0; card_i < ms->card_a && e == 0; card_i++) {
                  time_diff = ms->timestamp - ms->card_l[card_i].card_time;
                  retent = exp(-(double)time_diff / ms->card_l[card_i].card_strength);
                  card_state = ms->card_l[card_i].card_state & 0x07;
                  switch (card_state) {
                  case STATE_SCHEDULED:
                    if (retent <= 1 / M_E) {
                      ms->cards_nel++;
                      if (ms->card_l[card_i].card_strength <= card_strength_thr) {
                        if (card_strength_thr > lvl_s[ms->passwd.rank]) {
                          if (ms->card_l[card_i].card_strength <= lvl_s[ms->passwd.rank]) {
                            card_strength_thr = lvl_s[ms->passwd.rank];
                            reten_state[STATE_SCHEDULED] = 1.0;
                          }
                        }
                        if (retent < reten_state[STATE_SCHEDULED] || (retent == reten_state[STATE_SCHEDULED] && time_diff > state_time_diff[STATE_SCHEDULED])) {
                          reten_state[STATE_SCHEDULED] = retent;
                          state_time_diff[STATE_SCHEDULED] = time_diff;
                          sel_card[STATE_SCHEDULED] = card_i;
                          sel_deck[card_state] = deck_i;
                        }
                      }
                    }
                    break;
                  case STATE_ALARM:
                  case STATE_NEW:
                  case STATE_SUSPENDED:
                    if (retent < reten_state[card_state]) {
                      reten_state[card_state] = retent;
                      sel_card[card_state] = card_i;
                      sel_deck[card_state] = deck_i;
                    }
                    break;
                  default:
                    e = E_DETECA;
                  }
                }
              }
            }
          }
        }
      }
    }
    if (e == 0) {
      if (sel_card[STATE_SCHEDULED] != -1 && card_strength_thr == lvl_s[ms->passwd.rank]) {
        ms->card_i = sel_card[STATE_SCHEDULED];
        ms->deck_i = sel_deck[STATE_SCHEDULED];
      } else if (sel_card[STATE_NEW] != -1) {
        ms->card_i = sel_card[STATE_NEW];
        ms->deck_i = sel_deck[STATE_NEW];
      } else if (sel_card[STATE_SCHEDULED] != -1) {
        ms->card_i = sel_card[STATE_SCHEDULED];
        ms->deck_i = sel_deck[STATE_SCHEDULED];
      } else if (sel_card[STATE_SUSPENDED] != -1) {
        ms->card_i = sel_card[STATE_SUSPENDED];
        ms->deck_i = sel_deck[STATE_SUSPENDED];
      } else {
        e = -1;
      }
    }
  }
  return e;
}

static int sa_cmp(struct StringArray *sa_ls, struct StringArray *sa_rs)
{
  int is_equal;
  int i;
  int j;
  int n;
  char ch_ls; // left side
  char ch_rs; // right
  n = sa_ls->sa_c;
  is_equal = n == sa_rs->sa_c ? 1 : -1;
  if (is_equal == 1) {
    i = 0;
    j = 0;
    while (i < n && is_equal == 1) {
      do {
        ch_ls = sa_ls->sa_d[j];
        ch_rs = sa_rs->sa_d[j];
        is_equal = ch_ls == ch_rs;
        j++;
      } while (is_equal == 1 && ch_ls != '\0');
      i++;
    }
  }
  return is_equal;
}

static void sa_move(struct StringArray *sa_dest, struct StringArray *sa_src)
{
  free (sa_dest->sa_d);
  sa_dest->sa_d = sa_src->sa_d;
  sa_src->sa_d = NULL;
  sa_dest->sa_c = sa_src->sa_c;
  sa_src->sa_c = 0;
  sa_dest->sa_n = sa_src->sa_n;
  sa_src->sa_n = 0;
}

static int ms_modify_qa(struct StringArray *sa, struct MemorySurfer *ms, int *need_sync)
{
  int e;
  int is_equal;
  int32_t data_size;
  e = need_sync == NULL ? E_ARG_2 : 0;
  if (e == 0) {
    is_equal = sa_cmp(sa, &ms->card_sa);
    if (is_equal == 0) {
      sa_move(&ms->card_sa, sa);
      data_size = sa_length(&ms->card_sa);
      e = imf_put(&ms->imf, ms->card_l[ms->card_i].card_qai, ms->card_sa.sa_d, data_size);
      *need_sync = 1;
    }
  }
  return e;
}

static int ms_load_card_list(struct MemorySurfer *ms)
{
  int e;
  int32_t data_size;
  assert(ms->deck_i >= 0 && ms->deck_i < ms->deck_a && ms->cat_t[ms->deck_i].deck_slot_used != 0);
  assert((ms->card_a == 0 && ms->card_l == NULL) || (ms->card_a > 0 && ms->card_l != NULL));
  data_size = imf_get_size(&ms->imf, ms->cat_t[ms->deck_i].cat_cli);
  e = data_size < 0;
  if (e == 0) {
    if (data_size > 0) {
      ms->card_l = realloc(ms->card_l, data_size);
      e = ms->card_l == NULL;
      if (e == 0) {
        e = imf_get(&ms->imf, ms->cat_t[ms->deck_i].cat_cli, ms->card_l);
      }
    } else {
      free(ms->card_l);
      ms->card_l = NULL;
    }
  }
  if (e == 0) {
    ms->card_a = data_size / sizeof(struct Card);
  }
  return e;
}

static void str_tolower(char *str)
{
  int i;
  char ch;
  static uint8_t map[256] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
    0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, // A - O
    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, // P - Z
    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
    0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
    0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
    0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
    0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
    0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff };
  assert (str != NULL);
  i = 0;
  while (ch = str[i], ch != '\0')
  {
    str[i++] = map[(uint8_t)ch];
  }
}

static int ms_close(struct MemorySurfer *ms)
{
  int e;
  assert(ms->imf_filename != NULL);
  e = imf_close(&ms->imf);
  if (e == 0) {
    sa_free(&ms->deck_sa);
    assert((ms->deck_a == 0 && ms->cat_t == NULL) || (ms->deck_a > 0 && ms->cat_t != NULL));
    free(ms->cat_t);
    ms->cat_t = NULL;
    ms->deck_a = 0;
    ms->n_first = -1;
  }
  return e;
}

static void e2str(int e, char *e_str)
{
  int i;
  char ch;
  int number;
  if (e == 0) {
    strcpy(e_str, "0");
  } else if (e == 1) {
    strcpy(e_str, "1");
  } else if (e < 0) {
    strcpy(e_str, "< 0");
  } else {
    strcpy(e_str, "E_");
    i = 2;
    number = -1;
    while (e != 0) {
      if (number >= 0) {
        ch = e % 27;
        if (ch != 0) {
          ch += '@';
          e_str[i++] = ch;
        }
        e /= 27;
      } else {
        number = e % 10;
        e /= 10;
      }
    }
    if (number != 0) {
      e_str[i++] = '-';
      ch = '0' + number;
      e_str[i++] = ch;
    }
    e_str[i] = '\0';
  }
}

static size_t utf8_char_len(const char *s)
{
  size_t len;
  const uint8_t *b;
  b = (const uint8_t *)s;
  if ((*b & 0x80) == 0)
    len = 1;
  else if ((*b & 0xE0) == 0xC0)
    len = 2;
  else if ((*b & 0xF0) == 0xE0)
    len = 3;
  else if ((*b & 0xF8) == 0xF0)
    len = 4;
  else
    len = 0;
  return len;
}

static int utf8_strcspn(const char *s, const char *reject, size_t *n)
{
  int e;
  size_t len;
  int i;
  int j;
  int found;
  e = s == NULL || reject == NULL || n == NULL;
  if (e == 0) {
    *n = 0;
    do {
      i = 0;
      do {
        len = utf8_char_len(reject + i);
        e = len == 0;
        if (e == 0) {
          j = 0;
          found = 1;
          while (s[*n + j] != '\0' && j < len && found == 1) {
            found = s[*n + j] == reject[i + j];
            j++;
          }
          if (reject[i] != '\0')
            i += len;
          else
            found = -1;
        }
      } while (found == 0 && e == 0);
      if (found <= 0)
        ++*n;
    } while (found <= 0 && e == 0);
  }
  return e;
}

int main(int argc, char *argv[])
{
  int e; // error
  int saved_e;
  struct WebMemorySurfer *wms;
  char *dbg_filename;
  FILE *dbg_stream;
  int rv; // return value
  size_t size;
  size_t len;
  int deck_i;
  int i;
  int j;
  char *q_str;
  char *a_str;
  int search_deck_i;
  int search_card_i;
  char *lwr_search_txt; // lower case
  struct stat file_stat;
  int mtime_test;
  int act_i; // action index
  enum Action act_c; // current
  int32_t data_size;
  size_t n;
  DIR *dirp;
  char *fl_pn; // filelist pathname
  size_t fl_pn_alloc_size;
  size_t fl_pn_size;
  struct dirent *dirent;
  char *ext_str;
  int card_i;
  time_t time_diff;
  double retent; // retention
  char *str;
  struct Sha1Context sha1;
  uint8_t message_digest[SHA1_HASH_SIZE];
  uint32_t mod_time;
  int deck_a;
  int16_t n_parent;
  int16_t n_prev;
  int16_t *n_path;
  struct Card card;
  int32_t index;
  struct Card *mov_card_l;
  int mov_card_a;
  void *dest;
  void *src;
  struct Deck *cat_ptr;
  struct Card *card_ptr;
  char e_str[11]; // E_AAAAAA-1 + '\0'
  struct tm bd_time; // broken-down
  int need_sync;
  FILE *temp_stream;
  struct XML *xml;
  do {
    e = MACRO_TO_CALL_FCGI_ACCEPT < 0;
    if (e == 0) {
      dbg_stream = NULL;
      size = sizeof(struct WebMemorySurfer);
      wms = malloc(size);
      e = wms == NULL ? E_MALLOC_4 : 0;
      if (e == 0) {
        e = wms_init(wms);
        if (e == 0) {
          wms->sw_i = sw_start("main", &wms->ms.imf.sw);
          e = wms->sw_i != 0;
          if (e == 0) {
            size = strlen(DATA_PATH) + 10 + 1;
            dbg_filename = malloc(size);
            e = dbg_filename == NULL ? E_MALLOC_5 : 0;
            if (e == 0) {
              rv = snprintf(dbg_filename, size, "%s%s", DATA_PATH, "/debug.csv");
              e = rv < 0 || rv >= size;
              if (e == 0) {
                dbg_stream = fopen(dbg_filename, "a");
                if (dbg_stream == NULL) {
                  rv = fprintf(stderr, "Can't open \"%s\"\n", dbg_filename);
                  e = rv < 0;
                }
                size = sizeof(struct tm);
                memset(&bd_time, 0, size);
                e = gmtime_r(&wms->ms.timestamp, &bd_time) == NULL;
                if (e == 0) {
                  bd_time.tm_mon += 1;
                  bd_time.tm_year += 1900;
                  rv = fprintf(dbg_stream != NULL ? dbg_stream : stderr, "%4d-%02d-%02dT%02d:%02d:%02d ",
                      bd_time.tm_year, bd_time.tm_mon, bd_time.tm_mday,
                      bd_time.tm_hour, bd_time.tm_min, bd_time.tm_sec);
                  e = rv < 0;
                }
              }
              free(dbg_filename);
            }
          } else {
            e = E_INIT; // starting stopwatch failed
          }
          if (e == 0) {
            e = parse_post(wms);
            if (e == 0) {
              for (i = 0; wms->ms.deck_i == -1 && i < wms->ms.deck_flags_n; i++) {
                if (wms->ms.deck_flags[i] == 1) {
                  wms->ms.deck_i = i;
                }
              }
            } else if (wms->page == P_UNDEF) {
              e2str(e, e_str);
              wms->msg_header = "Invalid form data";
              wms->msg_static = e_str;
              wms->msg_btn_main = "OK";
              wms->todo_main = S_NONE;
              wms->page = P_MSG;
            }
          }
          if (e == 0) {
            mtime_test = -1;
            act_i = 0;
            need_sync = 0;
            assert(wms->seq <= S_END);
            while ((act_c = action_seq[wms->seq][act_i++]) != A_END && e == 0) {
              switch (act_c) {
              case A_END:
                assert (0);
                break;
              case A_NONE:
                wms->page = P_START;
                break;
              case A_FILE:
                wms->page = P_FILE;
                break;
              case A_WARN_UPLOAD:
                if (wms->ms.n_first != -1) {
                  wms->msg_header = "Warning: Erase?";
                  wms->msg_static = "Before importing, the content of the current file is erased (and rebuild during the import).";
                  wms->msg_btn_main = "Erase";
                  wms->msg_btn_alt = "Cancel";
                  wms->page = P_MSG;
                  wms->mode = M_MSG_UPLOAD;
                } else {
                  wms->page = P_UPLOAD;
                }
                break;
              case A_CREATE:
                rv = ms_create(&wms->ms, O_EXCL);
                e = rv != 0 ? E_CREATE : 0;
                if (e != 0) {
                  assert(wms->file_title_str != NULL);
                  free(wms->file_title_str);
                  wms->file_title_str = NULL;
                  e2str(e, e_str);
                  wms->msg_header = strerror(rv);
                  wms->msg_static = e_str;
                  wms->msg_btn_main = "OK";
                  wms->todo_main = S_NONE;
                  wms->page = P_MSG;
                }
                break;
              case A_NEW:
                wms->page = P_NEW;
                break;
              case A_OPEN_DLG:
                wms->page = P_OPEN;
                break;
              case A_FILELIST:
                dirp = opendir(DATA_PATH);
                e = dirp == NULL;
                if (e == 0) {
                  fl_pn = NULL;
                  fl_pn_alloc_size = 0;
                  do {
                    dirent = readdir(dirp);
                    if (dirent != NULL) {
                      fl_pn_size = strlen(DATA_PATH) + strlen(dirent->d_name) + 2;
                      if (fl_pn_size > fl_pn_alloc_size) {
                        fl_pn = realloc(fl_pn, fl_pn_size);
                        e = fl_pn == NULL;
                        if (e == 0)
                          fl_pn_alloc_size = fl_pn_size;
                      }
                      if (e == 0) {
                        strcpy(fl_pn, DATA_PATH);
                        strcat(fl_pn, "/");
                        strcat(fl_pn, dirent->d_name);
                        e = stat(fl_pn, &file_stat);
                        if (e == 0) {
                          if (file_stat.st_mode & S_IFREG) {
                            ext_str = rindex(fl_pn, '.');
                            if (ext_str != NULL && strcmp(ext_str, ".imsf") == 0) {
                              size = sizeof(char*) * (wms->fl_c + 1);
                              wms->fl_v = realloc(wms->fl_v, size);
                              e = wms->fl_v == NULL;
                              if (e == 0) {
                                size = strlen(dirent->d_name) + 1;
                                wms->fl_v[wms->fl_c] = malloc(size);
                                e = wms->fl_v[wms->fl_c] == NULL;
                                if (e == 0) {
                                  strcpy(wms->fl_v[wms->fl_c], dirent->d_name);
                                  wms->fl_c++;
                                }
                              }
                            }
                          }
                        }
                      }
                    }
                  } while (dirent != NULL && e == 0);
                  free(fl_pn);
                  e = closedir(dirp);
                }
                break;
              case A_OPEN:
                if (wms->ms.imf_filename != NULL) {
                  e = ms_open(&wms->ms);
                  if (e != 0) {
                    free(wms->file_title_str);
                    wms->file_title_str = NULL;
                    free(wms->ms.imf_filename);
                    wms->ms.imf_filename = NULL;
                    e2str(e, e_str);
                    wms->msg_header = "Can't open file";
                    wms->msg_static = e_str;
                    wms->msg_btn_main = "OK";
                    wms->todo_main = S_NONE;
                    wms->page = P_MSG;
                  }
                } else {
                  e = wms->seq != S_FILE && wms->seq != S_ABOUT;
                }
                break;
              case A_CHANGE_PASSWD:
                free(wms->ms.password);
                assert(wms->ms.new_password != NULL);
                wms->ms.password = wms->ms.new_password;
                wms->ms.new_password = NULL;
                break;
              case A_WRITE_PASSWD:
                e = sha1_reset(&sha1);
                if (e == 0) {
                  assert(wms->ms.password != NULL);
                  len = strlen(wms->ms.password);
                  e = sha1_input(&sha1, (uint8_t*)wms->ms.password, len);
                  if (e == 0) {
                    e = sha1_result(&sha1, wms->ms.passwd.pw_msg_digest);
                    if (e == 0) {
                      wms->ms.passwd.pw_flag = 1;
                      need_sync = 1;
                    }
                  }
                }
                break;
              case A_READ_PASSWD:
                if (wms->ms.imf_filename != NULL) {
                  assert(wms->ms.passwd.pw_flag == -1 && wms->ms.passwd.version == 0 && wms->ms.passwd.style_sai == -1);
                  data_size = imf_get_size(&wms->ms.imf, PW_INDEX);
                  e = data_size != 23 && data_size != 32 && data_size != 36 && data_size != sizeof(struct Password);
                  if (e == 0) {
                    e = imf_get(&wms->ms.imf, PW_INDEX, &wms->ms.passwd);
                    if (e == 0) {
                      if (data_size == 23 || data_size == 32 || data_size == 36) {
                        wms->ms.passwd.version = 0x01000000;
                        wms->ms.passwd.mctr = 0;
                        wms->ms.passwd.rank = 4;
                      }
                    }
                  } else {
                    free(wms->file_title_str);
                    wms->file_title_str = NULL;
                    wms->msg_header = "Read of password hash failed";
                    wms->msg_btn_main = "OK";
                    wms->todo_main = S_NONE;
                    wms->page = P_MSG;
                  }
                } else {
                  e = wms->seq != S_FILE && wms->seq != S_ABOUT;
                }
                break;
              case A_CHECK_PASSWORD:
                assert(wms->ms.passwd.pw_flag >= 0);
                e = wms->ms.passwd.pw_flag > 0;
                if (e != 0) {
                  wms->msg_header = "A password is already set";
                  wms->msg_btn_main = "OK";
                  wms->todo_main = S_GO_LOGIN;
                  wms->page = P_MSG;
                }
                break;
              case A_AUTH_PASSWD:
                assert(wms->ms.passwd.pw_flag > 0);
                e = sha1_reset(&sha1);
                if (e == 0) {
                  assert(wms->ms.password != NULL);
                  len = strlen(wms->ms.password);
                  e = sha1_input(&sha1, (uint8_t*)wms->ms.password, len);
                  if (e == 0) {
                    e = sha1_result(&sha1, message_digest);
                    if (e == 0) {
                      e = memcmp(wms->ms.passwd.pw_msg_digest, message_digest, SHA1_HASH_SIZE) != 0;
                    }
                  }
                }
                if (e != 0) {
                  sleep(1);
                  wms->msg_header = "Invalid password";
                  wms->msg_btn_main = "OK";
                  wms->todo_main = S_GO_LOGIN;
                  wms->page = P_MSG;
                }
                break;
              case A_AUTH_TOK:
                if (wms->ms.imf_filename != NULL) {
                  assert(wms->ms.passwd.pw_flag > 0);
                  assert(wms->ms.passwd.timeout.to_sec > 0 && wms->ms.passwd.timeout.to_count > 0);
                  mod_time = wms->ms.timestamp / wms->ms.passwd.timeout.to_sec * wms->ms.passwd.timeout.to_sec;
                  i = 0;
                  do {
                    e = sha1_reset(&sha1);
                    assert(e == 0);
                    e = sha1_input(&sha1, (uint8_t*)wms->ms.passwd.pw_msg_digest, SHA1_HASH_SIZE);
                    if (e == 0) {
                      e = sha1_input(&sha1, (uint8_t*)&mod_time, sizeof(uint32_t));
                      if (e == 0) {
                        e = sha1_result(&sha1, message_digest);
                        if (e == 0) {
                          rv = memcmp(wms->tok_digest, message_digest, SHA1_HASH_SIZE);
                          e = rv != 0;
                        }
                      }
                    }
                    mod_time -= wms->ms.passwd.timeout.to_sec;
                    i++;
                  } while (i < wms->ms.passwd.timeout.to_count && e != 0);
                  if (e != 0) {
                    sleep(1);
                    wms->msg_header = "Invalid session token";
                    wms->msg_btn_main = "OK";
                    wms->todo_main = S_GO_LOGIN;
                    wms->page = P_MSG;
                  }
                } else {
                  e = wms->seq != S_FILE && wms->seq != S_ABOUT;
                }
                break;
              case A_GEN_TOK:
                if (wms->ms.imf_filename != NULL) {
                  assert(wms->ms.passwd.pw_flag > 0);
                  e = sha1_reset(&sha1);
                  if (e == 0) {
                    e = sha1_input(&sha1, (uint8_t*)wms->ms.passwd.pw_msg_digest, SHA1_HASH_SIZE);
                    if (e == 0) {
                      assert(wms->ms.passwd.timeout.to_sec > 0);
                      mod_time = wms->ms.timestamp / wms->ms.passwd.timeout.to_sec * wms->ms.passwd.timeout.to_sec;
                      e = sha1_input(&sha1, (uint8_t*)&mod_time, sizeof(uint32_t));
                      if (e == 0) {
                        e = sha1_result(&sha1, message_digest);
                        if (e == 0) {
                          print_hex(wms->tok_str, message_digest, SHA1_HASH_SIZE);
                        }
                      }
                    }
                  }
                } else {
                  e = wms->seq != S_FILE && wms->seq != S_ABOUT;
                }
                break;
              case A_RETRIEVE_MTIME:
                e = mtime_test != -1 ? E_ASSRT_3 : 0;
                if (e == 0) {
                  mtime_test = 1;
                  if (wms->mtime[0] != 0 || wms->mtime[1] != 0) {
                    mtime_test = 0;
                    if (wms->mtime[0] >= 0 && wms->mtime[1] >= 0) {
                      if (wms->ms.imf_filename != NULL) {
                        memset(&file_stat, 0, sizeof(struct stat));
                        e = stat(wms->ms.imf_filename, &file_stat);
                        if (e == 0) {
                          assert(file_stat.st_mtim.tv_sec >= 0 && file_stat.st_mtim.tv_nsec >= 0);
                          mtime_test = wms->mtime[0] == file_stat.st_mtim.tv_nsec && wms->mtime[1] == file_stat.st_mtim.tv_sec;
                        }
                      }
                    }
                  }
                }
                break;
              case A_MTIME_TEST:
                e = mtime_test == -1 ? E_ASSRT_4 : 0;
                if (e == 0) {
                  e = mtime_test == 0;
                  if (e != 0) {
                    wms->msg_header = "Invalid mtime value";
                    wms->msg_static = "The file was modified elsewhere";
                    wms->msg_btn_main = "OK";
                    wms->todo_main = S_START;
                    wms->page = P_MSG;
                  }
                }
                break;
              case A_TEST_CARD:
                e = wms->ms.card_a < 0 ? E_CARD_1 : 0;
                if (e == 0) {
                  if (wms->ms.card_a > 0) {
                    if (wms->seq == S_EDIT && wms->ms.card_i == -1) {
                      wms->ms.card_i = 0;
                    }
                    e = wms->ms.card_i < 0 || wms->ms.card_i >= wms->ms.card_a || wms->ms.card_l == NULL ? E_CARD_2 : 0;
                    if (e != 0) {
                      wms->msg_header = "Invalid card";
                      wms->msg_static = "Out of bounds";
                      wms->msg_btn_main = "OK";
                      wms->page = P_MSG;
                    }
                  } else {
                    assert(wms->ms.card_a == 0);
                    e = wms->seq != S_APPEND && wms->seq != S_EDIT ? E_CARD_3 : 0;
                    if (e == 0) {
                      e = wms->ms.card_i == -1 ? 0 : E_CARD_4;
                    } else {
                      wms->msg_header = "Empty deck";
                      wms->msg_static = "No card present";
                      wms->msg_btn_main = "OK";
                      wms->page = P_MSG;
                    }
                  }
                  if (e != 0) {
                    if (wms->seq == S_EDIT_SYNC_RANK || wms->seq == S_EDIT_SYNC || wms->seq == S_INSERT) {
                      wms->mode = M_MSG_SELECT_EDIT;
                    } else {
                      wms->mode = M_MSG_START;
                    }
                  }
                }
                break;
              case A_TEST_CAT_SELECTED:
                e = wms->ms.deck_i < 0;
                if (e == 1) {
                  wms->msg_header = "No deck selected";
                  wms->msg_btn_main = "OK";
                  wms->todo_main = S_START;
                  wms->page = P_MSG;
                  if (wms->from_page == P_LEARN) {
                    wms->msg_header = "Please select a category to learn";
                    wms->todo_main = S_SELECT_LEARN_DECK;
                  } else if (wms->from_page == P_SELECT_DECK || wms->from_page == P_SELECT_DEST_DECK) {
                    if (wms->seq == S_DECKS_CREATE)
                      wms->msg_header = "Please select a category were to arrange the new category to";
                    wms->todo_main = S_START_DECKS;
                  }
                }
                break;
              case A_TEST_CAT_VALID:
                e = wms->ms.deck_i >= wms->ms.deck_a || wms->ms.cat_t[wms->ms.deck_i].deck_slot_used == 0;
                if (e == 1) {
                  wms->ms.deck_i = -1;
                  wms->msg_header = "Invalid deck";
                  wms->msg_btn_main = "OK";
                  wms->todo_main = S_SELECT_LEARN_DECK;
                  wms->page = P_MSG;
                }
                break;
              case A_TEST_DECK:
                e = wms->ms.deck_i < 0 ? E_DECK_1 : 0; // no deck
                if (e == 0) {
                  e = wms->ms.deck_i >= wms->ms.deck_a ? E_DECK_2 : 0; // out of bounds
                  if (e == 0) {
                    e = wms->ms.cat_t[wms->ms.deck_i].deck_slot_used == 0 ? E_DECK_3 : 0; // not used
                    if (e != 0) {
                      wms->msg_static = "The selected deck (index) is not in use (anymore)";
                    }
                  } else {
                    wms->msg_static = "The selected deck is out of bounds";
                  }
                  if (e != 0) {
                    wms->msg_header = "Invalid deck";
                  }
                } else {
                  if (wms->seq == S_DECKS_CREATE || wms->seq == S_CREATE_DECK) {
                    e = wms->ms.deck_i != -1 || wms->ms.n_first != -1;
                  }
                  if (e != 0) {
                    wms->msg_header = "No deck selected";
                    if (wms->from_page == P_SELECT_DECK) {
                      if (wms->seq == S_DECKS_CREATE) {
                        wms->msg_static = "Please select a deck where to arrange the new deck to";
                      } else if (wms->seq == S_SELECT_DEST_CAT) {
                        wms->msg_static = "Please select a deck to move";
                      } else if (wms->seq == S_ASK_DELETE_DECK) {
                        wms->msg_static = "Please select a deck to delete";
                      } else if (wms->seq == S_TOGGLE) {
                        wms->msg_static = "Please select a deck to toggle";
                      } else if (wms->seq == S_EDIT) {
                        wms->msg_static = "Please select a deck to edit";
                      } else if (wms->seq == S_QUESTION) {
                        wms->msg_static = "Please select a deck to learn";
                      } else if (wms->seq == S_SEARCH) {
                        wms->msg_static = "Please select a deck to search";
                      } else if (wms->seq == S_DECKS_RENAME) {
                        wms->msg_static = "Please select a deck to rename";
                      } else {
                        e = E_DECK_4;
                      }
                    }
                  }
                }
                if (e != 0) {
                  wms->msg_btn_main = "OK";
                  wms->page = P_MSG;
                  if (wms->seq == S_DECK_NAME || wms->seq == S_RENAME_DECK || wms->seq == S_CREATE_DECK || wms->seq == S_DELETE_DECK) {
                    wms->mode = M_MSG_DECKS;
                  } else if (wms->seq == S_EDIT || wms->seq == S_STYLE || wms->seq == S_STYLE_APPLY) {
                    wms->mode = M_MSG_SELECT_EDIT;
                  } else if (wms->seq == S_SEARCH) {
                    wms->mode = M_MSG_SELECT_SEARCH;
                  } else {
                    wms->mode = wms->saved_mode == M_START ? M_MSG_DECKS : M_MSG_SELECT_LEARN;
                  }
                }
                break;
              case A_TEST_ARRANGE:
                if (wms->ms.arrange >= 0) {
                  e = wms->ms.arrange > 2;
                } else {
                  e = wms->ms.arrange != -1 || wms->ms.n_first != -1;
                }
                if (e != 0) {
                  wms->msg_header = "No arrange";
                  wms->msg_static = "Please select how to arrange the deck";
                  wms->msg_btn_main = "OK";
                  wms->page = P_MSG;
                  wms->mode = M_MSG_DECKS;
                }
                break;
              case A_TEST_NAME:
                e = wms->ms.deck_name_str == NULL;
                if (e == 0) {
                  len = strlen(wms->ms.deck_name_str);
                  e = len == 0;
                }
                if (e != 0) {
                  wms->msg_header = "Please enter a name for the deck";
                  wms->msg_btn_main = "OK";
                  wms->todo_main = S_START_DECKS;
                  wms->page = P_MSG;
                }
                break;
              case A_SLASH:
                e = wms->file_title_str == NULL ? E_ASSRT_5 : 0;
                if (e == 0) {
                  str = strchr(wms->file_title_str, '/');
                  e = str != NULL;
                  if (e != 0) {
                    free(wms->file_title_str);
                    wms->file_title_str = NULL;
                    wms->msg_header = "Error: Slash ('/')";
                    wms->msg_btn_main = "OK";
                    wms->todo_main = S_FILE;
                    wms->page = P_MSG;
                  }
                }
                break;
              case A_VOID:
                assert(wms->file_title_str != NULL);
                len = strlen(wms->file_title_str);
                e = len == 0;
                if (e != 0) {
                  free(wms->file_title_str);
                  wms->file_title_str = NULL;
                  wms->msg_header = "Error: No filename";
                  wms->msg_btn_main = "OK";
                  wms->todo_main = S_FILE;
                  wms->page = P_MSG;
                }
                break;
              case A_FILE_EXTENSION:
                assert(wms->file_title_str != NULL);
                ext_str = rindex(wms->file_title_str, '.');
                if (ext_str == NULL || strcmp(ext_str, ".imsf") != 0) {
                  size = strlen(wms->file_title_str) + 6; // + ".imsf" + '\0'
                  str = malloc(size);
                  e = str == NULL;
                  if (e == 0) {
                    strcpy(str, wms->file_title_str);
                    strcat(str, ".imsf");
                    free(wms->file_title_str);
                    wms->file_title_str = str;
                  }
                }
                break;
              case A_GATHER:
                if (wms->file_title_str != NULL) {
                  size = strlen(DATA_PATH) + strlen(wms->file_title_str) + 2; // '/' + '\0'
                  str = malloc(size);
                  e = str == NULL;
                  if (e == 0) {
                    rv = snprintf(str, size, "%s/%s", DATA_PATH, wms->file_title_str);
                    e = rv < 0 || rv >= size;
                    if (e == 0) {
                      assert(wms->ms.imf_filename == NULL);
                      wms->ms.imf_filename = str;
                    }
                  }
                } else {
                  e = wms->seq != S_FILE && wms->seq != S_ABOUT;
                }
                break;
              case A_UPLOAD:
                wms->page = P_UPLOAD;
                break;
              case A_UPLOAD_REPORT:
                if (wms->posted_message_digest != NULL) {
                  e = sha1_reset(&sha1);
                  if (e == 0) {
                    temp_stream = fopen(wms->temp_filename, "r");
                    e = temp_stream == NULL;
                    if (e == 0) {
                      do {
                        len = fread(wms->html_lp, 1, wms->html_n, temp_stream);
                        e = len == 0 && ferror(temp_stream) != 0;
                        if (len > 0 && e == 0) {
                          e = sha1_input(&sha1, (uint8_t*)wms->html_lp, len);
                        }
                      } while (feof(temp_stream) == 0 && e == 0);
                      if (e == 0) {
                        e = sha1_result(&sha1, message_digest);
                        if (e == 0) {
                          e = memcmp(wms->posted_message_digest, message_digest, 20) != 0 ? E_MISMA : 0;
                        }
                      }
                      rv = fclose(temp_stream);
                      if (e == 0) {
                        e = rv != 0 ? E_SHA : 0;
                      }
                    }
                  }
                }
                if (e == 0) {
                  e = wms->ms.n_first == -1 ? 0 : E_UPLOAD_1; // file not empty
                  if (e == 0) {
                    size = sizeof(struct XML);
                    xml = malloc(size);
                    e = xml == NULL;
                    if (e == 0) {
                      xml->n = 0;
                      xml->p_lineptr = NULL;
                      xml->cardlist_l = NULL;
                      xml->prev_cat_i = -1;
                      xml->xml_stream = fopen(wms->temp_filename, "r");
                      e = xml->xml_stream == NULL;
                      if (e == 0) {
                        wms->card_n = 0;
                        wms->deck_n = 0;
                        e = parse_xml(xml, wms, TAG_ROOT, -1);
                        rv = fclose(xml->xml_stream);
                        if (e == 0) {
                          e = rv;
                        }
                        xml->xml_stream = NULL;
                      }
                      free(xml->cardlist_l);
                      xml->cardlist_l = NULL;
                      free(xml->p_lineptr);
                      xml->p_lineptr = NULL;
                      xml->n = 0;
                      free(xml);
                      xml = NULL;
                    }
                  }
                }
                if (e == 0) {
                  data_size = sa_length(&wms->ms.deck_sa);
                  e = imf_put(&wms->ms.imf, SA_INDEX, wms->ms.deck_sa.sa_d, data_size);
                  if (e == 0) {
                    data_size = sizeof(struct Deck) * wms->ms.deck_a;
                    e = imf_put(&wms->ms.imf, C_INDEX, wms->ms.cat_t, data_size);
                    if (e == 0) {
                      assert(wms->ms.passwd.style_sai == -1);
                      data_size = sa_length(&wms->ms.style_sa);
                      if (data_size > 0) {
                        e = imf_seek_unused(&wms->ms.imf, &wms->ms.passwd.style_sai);
                        if (e == 0) {
                          e = imf_put(&wms->ms.imf, wms->ms.passwd.style_sai, wms->ms.style_sa.sa_d, data_size);
                        }
                      }
                      need_sync = e == 0;
                      if (e == 0) {
                        wms->page = P_UPLOAD_REPORT;
                      }
                    }
                  }
                }
                break;
              case A_EXPORT:
                wms->page = P_EXPORT;
                break;
              case A_LOAD_CARDLIST:
                assert(wms->ms.deck_i >= 0 && wms->ms.deck_i < wms->ms.deck_a && wms->ms.cat_t[wms->ms.deck_i].deck_slot_used != 0);
                e = ms_load_card_list(&wms->ms);
                break;
              case A_LOAD_CARDLIST_OLD:
                e = wms->ms.deck_i < 0;
                if (e == 0) {
                  assert(wms->ms.deck_i >= 0);
                  e = wms->ms.deck_i >= wms->ms.deck_a || wms->ms.cat_t[wms->ms.deck_i].deck_slot_used == 0;
                  if (e == 0) {
                    assert(wms->ms.deck_i < wms->ms.deck_a && wms->ms.cat_t[wms->ms.deck_i].deck_slot_used != 0);
                    e = ms_load_card_list(&wms->ms);
                  } else {
                    wms->ms.deck_i = -1;
                    wms->msg_header = "Invalid deck";
                    wms->msg_btn_main = "OK";
                    wms->todo_main = S_NONE; // S_SELECT_EDIT_DECK S_SELECT_SEARCH_DECK S_SELECT_LEARN_DECK S_DELETE_CARD S_APPEND S_SELECT_EDIT_DECK
                    wms->page = P_MSG;
                  }
                } else {
                  assert(wms->ms.deck_i == -1);
                  wms->msg_header = "Please select a category";
                  wms->msg_btn_main = "OK";
                  wms->todo_main = S_START; // S_NONE S_SELECT_EDIT_DECK S_SELECT_SEARCH_DECK S_SELECT_LEARN_DECK S_DELETE_CARD S_SELECT_EDIT_DECK
                  wms->page = P_MSG;
                }
                break;
              case A_GET_CARD:
                e = ms_get_card_sa(&wms->ms);
                break;
              case A_CHECK_RESUME:
                if (wms->ms.card_a > 0) {
                  for (card_i = 0; card_i < wms->ms.card_a && wms->ms.can_resume == 0; card_i++) {
                    if ((wms->ms.card_l[card_i].card_state & 0x07) == STATE_SUSPENDED) {
                      wms->ms.can_resume = 1;
                    }
                  }
                }
                break;
              case A_DECK_PATH:
                size = sizeof(int16_t) * wms->ms.deck_a;
                n_path = malloc(size);
                e = n_path == NULL;
                if (e == 0) {
                  deck_i = wms->ms.deck_i;
                  j = 0;
                  while (deck_i != -1) {
                    n_path[j] = deck_i;
                    n_prev = -1;
                    n_parent = -1;
                    do {
                      for (i = 0; i < wms->ms.deck_a && n_parent == -1; i++) {
                        if (wms->ms.cat_t[i].deck_slot_used != 0) {
                          if ((n_prev == -1 && wms->ms.cat_t[i].n_sibling == deck_i) || (n_prev != -1 && wms->ms.cat_t[i].n_sibling == n_prev)) {
                            n_prev = i;
                          }
                          if (wms->ms.cat_t[i].n_child == deck_i || (n_prev != -1 && wms->ms.cat_t[i].n_child == n_prev)) {
                            n_parent = i;
                          }
                        }
                      }
                    } while (n_parent == -1 && (wms->ms.n_first != n_prev && n_prev != -1));
                    deck_i = n_parent;
                    j++;
                  }
                  len = 0;
                  while (j-- > 0 && e == 0) {
                    str = sa_get(&wms->ms.deck_sa, n_path[j]);
                    do {
                      size = 0;
                      rv = snprintf(wms->ms.deck_path + len, wms->ms.deck_path_z - len, "/%s", str);
                      e = rv < 0;
                      if (e == 0) {
                        if (rv >= wms->ms.deck_path_z - len) {
                          size = len + rv + 1;
                          wms->ms.deck_path = realloc(wms->ms.deck_path, size);
                          e = wms->ms.deck_path == NULL;
                          if (e == 0) {
                            wms->ms.deck_path_z = size;
                          }
                        } else {
                          len += rv;
                        }
                      }
                    } while (e == 0 && size != 0);
                  }
                  free(n_path);
                }
                break;
              case A_ASK_REMOVE:
                wms->msg_header = "Remove file from the file system?";
                wms->msg_btn_main = "Remove";
                wms->msg_btn_alt = "Cancel";
                wms->page = P_MSG;
                wms->mode = M_MSG_FILE;
                break;
              case A_REMOVE:
                e = ms_close(&wms->ms);
                if (e == 0) {
                  e = unlink(wms->ms.imf_filename);
                  if (e == 0) {
                    assert(wms->ms.imf_filename != NULL);
                    free(wms->ms.imf_filename);
                    wms->ms.imf_filename = NULL;
                    wms->tok_str[0] = '\0';
                  }
                }
                break;
              case A_ASK_ERASE:
                wms->msg_header = "Erase all decks & cards?";
                wms->msg_btn_main = "Erase";
                wms->msg_btn_alt = "Cancel";
                wms->page = P_MSG;
                wms->mode = M_MSG_FILE;
                break;
              case A_ERASE:
                e = ms_close(&wms->ms);
                if (e == 0) {
                  wms->ms.passwd.style_sai = -1;
                  e = ms_create(&wms->ms, O_TRUNC);
                  if (e == 0) {
                    wms->ms.deck_i = -1;
                  }
                }
                break;
              case A_CLOSE:
                free(wms->file_title_str);
                wms->file_title_str = NULL;
                wms->ms.deck_i = -1;
                wms->page = P_FILE;
                break;
              case A_START_DECKS:
                wms->page = P_SELECT_DECK;
                wms->mode = M_START;
                break;
              case A_DECKS_CREATE:
                if (wms->ms.n_first >= 0) {
                  wms->page = P_SELECT_ARRANGE;
                  wms->mode = M_CREATE_DECK;
                } else {
                  wms->page = P_CAT_NAME;
                }
                break;
              case A_SELECT_DEST_DECK:
                wms->ms.mov_deck_i = wms->ms.deck_i;
                wms->ms.deck_i = -1;
                wms->page = P_SELECT_DEST_DECK;
                wms->mode = M_MOVE;
                break;
              case A_SELECT_SEND_DECK:
                wms->ms.mov_card_i = wms->ms.card_i;
                wms->ms.card_i = -1;
                wms->ms.mov_deck_i = wms->ms.deck_i;
                wms->ms.deck_i = -1;
                wms->page = P_SELECT_DEST_DECK;
                wms->mode = M_SEND;
                break;
              case A_SELECT_PROCEED_SEND:
                wms->ms.mov_card_i = wms->ms.card_i;
                wms->ms.card_i = -1;
                wms->ms.mov_deck_i = wms->ms.deck_i;
                wms->ms.deck_i = -1;
                wms->page = P_SELECT_DEST_DECK;
                wms->mode = M_PROCEED_SEND;
                break;
              case A_SELECT_ARRANGE:
                wms->page = P_SELECT_ARRANGE;
                wms->mode = M_MOVE_DECK;
                break;
              case A_ENTER_NAME:
                wms->page = P_CAT_NAME;
                break;
              case A_STYLE_GO:
                wms->page = P_STYLE;
                break;
              case A_CREATE_DECK:
                if (wms->ms.deck_i >= 0) {
                  e = wms->ms.deck_i >= wms->ms.deck_a || wms->ms.cat_t[wms->ms.deck_i].deck_slot_used == 0;
                } else {
                  e = wms->ms.deck_i != -1 || wms->ms.n_first != -1;
                  if (e == 0) {
                    wms->ms.arrange = -1;
                  }
                }
                if (e == 0) {
                  deck_i = 0;
                  while (deck_i < wms->ms.deck_a && wms->ms.cat_t[deck_i].deck_slot_used != 0) {
                    deck_i++;
                  }
                  if (deck_i == wms->ms.deck_a) {
                    deck_a = wms->ms.deck_a + 7;
                    e = deck_a > INT16_MAX ? E_MAX : 0;
                    if (e == 0) {
                      size = sizeof(struct Deck) * deck_a;
                      wms->ms.cat_t = realloc(wms->ms.cat_t, size);
                      e = wms->ms.cat_t == NULL;
                      if (e == 0) {
                        for (i = wms->ms.deck_a; i < deck_a; i++) {
                          wms->ms.cat_t[i].deck_slot_used = 0;
                        }
                        wms->ms.deck_a = deck_a;
                      }
                    }
                  }
                  if (e == 0) {
                    assert(deck_i < wms->ms.deck_a && wms->ms.cat_t[deck_i].deck_slot_used == 0);
                    e = imf_seek_unused(&wms->ms.imf, &index);
                    if (e == 0) {
                      e = imf_put(&wms->ms.imf, index, "", 0);
                      if (e == 0) {
                        wms->ms.cat_t[deck_i].cat_cli = index;
                        e = sa_set(&wms->ms.deck_sa, deck_i, wms->ms.deck_name_str);
                        if (e == 0) {
                          wms->ms.cat_t[deck_i].deck_x = 1;
                          switch (wms->ms.arrange) {
                          case 0: // Before
                            n_prev = -1;
                            n_parent = -1;
                            for (i = 0; i < wms->ms.deck_a && n_prev == -1 && n_parent == -1; i++) {
                              if (wms->ms.cat_t[i].deck_slot_used != 0) {
                                if (wms->ms.cat_t[i].n_sibling == wms->ms.deck_i) {
                                  n_prev = i;
                                }
                                if (wms->ms.cat_t[i].n_child == wms->ms.deck_i) {
                                  n_parent = i;
                                }
                              }
                            }
                            if (n_prev != -1) {
                              assert(wms->ms.cat_t[n_prev].n_sibling == wms->ms.deck_i);
                              wms->ms.cat_t[n_prev].n_sibling = deck_i;
                            } else {
                              if (wms->ms.n_first == wms->ms.deck_i) {
                                wms->ms.n_first = deck_i;
                              } else {
                                assert(n_parent != -1);
                                wms->ms.cat_t[n_parent].n_child = deck_i;
                              }
                            }
                            wms->ms.cat_t[deck_i].n_sibling = wms->ms.deck_i;
                            wms->ms.cat_t[deck_i].n_child = -1;
                            break;
                          case 1: // Below
                            wms->ms.cat_t[deck_i].n_sibling = wms->ms.cat_t[wms->ms.deck_i].n_child;
                            wms->ms.cat_t[wms->ms.deck_i].n_child = deck_i;
                            wms->ms.cat_t[deck_i].n_child = -1;
                            break;
                          case 2: // Behind
                            wms->ms.cat_t[deck_i].n_sibling = wms->ms.cat_t[wms->ms.deck_i].n_sibling;
                            wms->ms.cat_t[wms->ms.deck_i].n_sibling = deck_i;
                            wms->ms.cat_t[deck_i].n_child = -1;
                            break;
                          case -1:
                            e = wms->ms.n_first != -1;
                            if (e == 0) {
                              wms->ms.cat_t[deck_i].n_sibling = -1;
                              wms->ms.cat_t[deck_i].n_child = -1;
                              assert(deck_i == 0);
                              wms->ms.n_first = deck_i;
                            }
                            break;
                          default:
                            e = E_ARRANG_1;
                          }
                          if (e == 0) {
                            wms->ms.cat_t[deck_i].deck_slot_used = 1;
                            wms->ms.cat_t[deck_i].deck_on = 1;
                            data_size = sa_length(&wms->ms.deck_sa);
                            e = imf_put(&wms->ms.imf, SA_INDEX, wms->ms.deck_sa.sa_d, data_size);
                            if (e == 0) {
                              data_size = sizeof(struct Deck) * wms->ms.deck_a;
                              e = imf_put(&wms->ms.imf, C_INDEX, wms->ms.cat_t, data_size);
                              if (e == 0) {
                                need_sync = 1;
                                wms->ms.deck_i = deck_i;
                                wms->page = P_SELECT_DECK;
                                wms->mode = M_START;
                              }
                            }
                          }
                        }
                      }
                    }
                  }
                }
                break;
              case A_RENAME_DECK:
                assert(wms->ms.deck_i >= 0 && wms->ms.deck_i < wms->ms.deck_a && wms->ms.cat_t[wms->ms.deck_i].deck_slot_used != 0);
                e = sa_set(&wms->ms.deck_sa, wms->ms.deck_i, wms->ms.deck_name_str);
                if (e == 0) {
                  data_size = sa_length(&wms->ms.deck_sa);
                  e = imf_put(&wms->ms.imf, SA_INDEX, wms->ms.deck_sa.sa_d, data_size);
                  if (e == 0) {
                    need_sync = 1;
                    wms->page = P_SELECT_DECK;
                    wms->mode = M_START;
                  }
                }
                break;
              case A_READ_STYLE:
                assert(wms->ms.passwd.pw_flag >= 0);
                if (wms->ms.passwd.style_sai >= 0) {
                  e = sa_load(&wms->ms.style_sa, &wms->ms.imf, wms->ms.passwd.style_sai);
                }
                break;
              case A_STYLE_APPLY:
                assert(wms->ms.passwd.pw_flag > 0);
                str = sa_get(&wms->ms.style_sa, wms->ms.deck_i);
                if (str == NULL || strcmp(str, wms->ms.style_txt) != 0) {
                  e = sa_set(&wms->ms.style_sa, wms->ms.deck_i, wms->ms.style_txt);
                  if (e == 0) {
                    data_size = sa_length(&wms->ms.style_sa);
                    if (wms->ms.passwd.style_sai < 0) {
                      e = imf_seek_unused(&wms->ms.imf, &wms->ms.passwd.style_sai);
                    }
                    if (e == 0) {
                      e = imf_put(&wms->ms.imf, wms->ms.passwd.style_sai, wms->ms.style_sa.sa_d, data_size);
                      need_sync = 1;
                    }
                  }
                }
                if (e == 0) {
                  wms->page = P_PREVIEW;
                }
                break;
              case A_ASK_DELETE_DECK:
                assert(wms->ms.cat_t[wms->ms.deck_i].deck_slot_used != 0);
                if (wms->ms.cat_t[wms->ms.deck_i].n_child == -1) {
                  size = 64;
                  assert(wms->dyn_msg == NULL);
                  wms->dyn_msg = malloc(size);
                  e = wms->dyn_msg == NULL;
                  if (e == 0) {
                    rv = snprintf(wms->dyn_msg, size, "Delete this deck and its %d card(s)?", wms->ms.card_a);
                    e = rv < 0 || rv >= size;
                    if (e == 0) {
                      wms->msg_header = "Delete Deck?";
                      wms->msg_static = wms->dyn_msg;
                      wms->msg_btn_main = "Delete";
                      wms->msg_btn_alt = "Cancel";
                      wms->page = P_MSG;
                      wms->mode = M_MSG_DECKS;
                    }
                  }
                } else {
                  wms->msg_header = "Delete (of deck) failed";
                  wms->msg_static = "A Deck to delete must be a leaf";
                  wms->msg_btn_main = "OK";
                  wms->page = P_MSG;
                  wms->mode = M_MSG_DECKS;
                }
                break;
              case A_DELETE_DECK:
                assert(wms->ms.cat_t[wms->ms.deck_i].deck_slot_used != 0);
                n_prev = -1;
                n_parent = -1;
                i = 0;
                do {
                  if (wms->ms.cat_t[i].deck_slot_used != 0) {
                    if (wms->ms.cat_t[i].n_sibling == wms->ms.deck_i) {
                      n_prev = i;
                    }
                    if (wms->ms.cat_t[i].n_child == wms->ms.deck_i) {
                      n_parent = i;
                    }
                  }
                  i++;
                } while (i < wms->ms.deck_a && n_prev == -1 && n_parent == -1);
                if (n_prev != -1) {
                  wms->ms.cat_t[n_prev].n_sibling = wms->ms.cat_t[wms->ms.deck_i].n_sibling;
                } else if (n_parent != -1) {
                  wms->ms.cat_t[n_parent].n_child = wms->ms.cat_t[wms->ms.deck_i].n_sibling;
                } else {
                  e = wms->ms.n_first != wms->ms.deck_i;
                  if (e == 0) {
                    wms->ms.n_first = wms->ms.cat_t[wms->ms.deck_i].n_sibling;
                  }
                }
                if (e == 0) {
                  e = ms_load_card_list(&wms->ms);
                  if (e == 0) {
                    card_i = 0;
                    while (card_i < wms->ms.card_a && e == 0) {
                      e = imf_delete(&wms->ms.imf, wms->ms.card_l[card_i].card_qai);
                      card_i++;
                    }
                    if (e == 0) {
                      e = imf_delete(&wms->ms.imf, wms->ms.cat_t[wms->ms.deck_i].cat_cli);
                    }
                  }
                }
                if (e == 0) {
                  wms->ms.cat_t[wms->ms.deck_i].deck_slot_used = 0;
                  data_size = sizeof(struct Deck) * wms->ms.deck_a;
                  e = imf_put(&wms->ms.imf, C_INDEX, wms->ms.cat_t, data_size);
                  if (e == 0) {
                    need_sync = 1;
                    wms->ms.deck_i = -1;
                    wms->page = P_SELECT_DECK;
                    wms->mode = M_START;
                  }
                }
                break;
              case A_TOGGLE:
                assert(wms->ms.deck_i >= 0 && wms->ms.deck_i < wms->ms.deck_a && wms->ms.cat_t[wms->ms.deck_i].deck_slot_used != 0);
                wms->ms.cat_t[wms->ms.deck_i].deck_x = wms->ms.cat_t[wms->ms.deck_i].deck_x == 0 ? 1 : 0;
                data_size = sizeof(struct Deck) * wms->ms.deck_a;
                e = imf_put(&wms->ms.imf, C_INDEX, wms->ms.cat_t, data_size);
                if (e == 0) {
                  need_sync = 1;
                  wms->page = P_SELECT_DECK;
                  wms->mode = M_START;
                }
                break;
              case A_MOVE_DECK:
                assert(wms->ms.cat_t[wms->ms.deck_i].deck_slot_used != 0);
                e = wms->ms.mov_deck_i < 0 || wms->ms.mov_deck_i >= wms->ms.deck_a || wms->ms.cat_t[wms->ms.mov_deck_i].deck_slot_used == 0 ? E_MOVED : 0;
                if (e == 0) {
                  n_prev = -1;
                  n_parent = wms->ms.deck_i;
                  do {
                    if (n_prev != -1) {
                      deck_i = n_prev;
                    }
                    if (n_parent != -1) {
                      deck_i = n_parent;
                    }
                    e = wms->ms.mov_deck_i == n_parent ? E_TOPOL : 0;
                    if (e == 0) {
                      n_prev = -1;
                      n_parent = -1;
                      for (i = 0; i < wms->ms.deck_a && n_parent == -1 && n_prev == -1; i++) {
                        if (wms->ms.cat_t[i].deck_slot_used != 0) {
                          if (wms->ms.cat_t[i].n_sibling == deck_i) {
                            n_prev = i;
                          }
                          if (wms->ms.cat_t[i].n_child == deck_i) {
                            n_parent = i;
                          }
                        }
                      }
                    }
                  } while ((n_parent != -1 || n_prev != -1) && e == 0);
                  if (e == 0) {
                    if (wms->ms.arrange != 0 || wms->ms.cat_t[wms->ms.mov_deck_i].n_sibling != wms->ms.deck_i) {
                      if (wms->ms.n_first != wms->ms.mov_deck_i) {
                        n_prev = -1;
                        n_parent = -1;
                        for (i = 0; i < wms->ms.deck_a && n_prev == -1 && n_parent == -1; i++)
                          if (wms->ms.cat_t[i].deck_slot_used != 0) {
                            if (wms->ms.cat_t[i].n_sibling == wms->ms.mov_deck_i) {
                              n_prev = i;
                            }
                            if (wms->ms.cat_t[i].n_child == wms->ms.mov_deck_i) {
                              n_parent = i;
                            }
                          }
                        if (n_prev != -1) {
                          wms->ms.cat_t[n_prev].n_sibling = wms->ms.cat_t[wms->ms.mov_deck_i].n_sibling;
                        }
                        if (n_parent != -1) {
                          wms->ms.cat_t[n_parent].n_child = wms->ms.cat_t[wms->ms.mov_deck_i].n_sibling;
                        }
                      } else {
                        wms->ms.n_first = wms->ms.cat_t[wms->ms.mov_deck_i].n_sibling;
                      }
                      switch (wms->ms.arrange) {
                      case 0: // Before
                        i = 0;
                        n_prev = -1;
                        n_parent = -1;
                        do {
                          if (wms->ms.cat_t[i].deck_slot_used != 0) {
                            if (wms->ms.cat_t[i].n_sibling == wms->ms.deck_i) {
                              n_prev = i;
                            }
                            if (wms->ms.cat_t[i].n_child == wms->ms.deck_i) {
                              n_parent = i;
                            }
                          }
                          i++;
                        } while (i < wms->ms.deck_a && n_prev == -1 && n_parent == -1);
                        if (n_prev != -1) {
                          assert(wms->ms.cat_t[n_prev].n_sibling == wms->ms.deck_i);
                          wms->ms.cat_t[n_prev].n_sibling = wms->ms.mov_deck_i;
                        } else {
                          if (wms->ms.n_first == wms->ms.deck_i) {
                            wms->ms.n_first = wms->ms.mov_deck_i;
                          } else {
                            assert(n_parent != -1);
                            wms->ms.cat_t[n_parent].n_child = wms->ms.mov_deck_i;
                          }
                        }
                        wms->ms.cat_t[wms->ms.mov_deck_i].n_sibling = wms->ms.deck_i;
                        break;
                      case 1: // Below
                        wms->ms.cat_t[wms->ms.mov_deck_i].n_sibling = wms->ms.cat_t[wms->ms.deck_i].n_child;
                        wms->ms.cat_t[wms->ms.deck_i].n_child = wms->ms.mov_deck_i;
                        break;
                      case 2: // Behind
                        wms->ms.cat_t[wms->ms.mov_deck_i].n_sibling = wms->ms.cat_t[wms->ms.deck_i].n_sibling;
                        wms->ms.cat_t[wms->ms.deck_i].n_sibling = wms->ms.mov_deck_i;
                        break;
                      default:
                        e = E_ARRANG_2;
                        break;
                      }
                      if (e == 0) {
                        data_size = sizeof(struct Deck) * wms->ms.deck_a;
                        e = imf_put(&wms->ms.imf, C_INDEX, wms->ms.cat_t, data_size);
                        if (e == 0) {
                          need_sync = 1;
                          wms->ms.deck_i = wms->ms.mov_deck_i;
                          wms->ms.mov_deck_i = -1;
                          wms->page = P_SELECT_DECK;
                          wms->mode = M_START;
                        }
                      }
                    } else {
                      wms->msg_header = "Unchanged";
                      wms->msg_static = "Moving the previous sibling before its following sibling has no effect";
                      wms->msg_btn_main = "OK";
                      wms->page = P_MSG;
                      wms->mode = M_MSG_DECKS;
                    }
                  } else {
                    wms->msg_header = "Invalid topology";
                    wms->msg_static = "Placing the deck here is not possible";
                    wms->msg_btn_main = "OK";
                    wms->page = P_MSG;
                    wms->mode = M_MSG_DECKS;
                  }
                }
                break;
              case A_SELECT_EDIT_CAT:
                wms->ms.card_i = -1;
                wms->page = P_SELECT_DECK;
                wms->mode = M_EDIT;
                break;
              case A_EDIT:
                e = wms->ms.card_a < 0 ? E_CARD_5 : 0;
                if (e == 0) {
                  if (wms->ms.card_a > 0) {
                    e = wms->ms.card_i >= 0 && wms->ms.card_i < wms->ms.card_a ? 0 : E_CARD_6;
                  } else {
                    e = wms->ms.card_i != -1 ? E_CARD_7 : 0;
                  }
                }
                if (e == 0) {
                  wms->page = P_EDIT;
                }
                break;
              case A_UPDATE_QA:
                if ((wms->from_page == P_EDIT) || (wms->ms.is_unlocked > 0 && (wms->from_page == P_PREVIEW || (wms->from_page == P_LEARN && wms->saved_mode == M_RATE)))) {
                  q_str = sa_get(&wms->qa_sa, 0);
                  a_str = sa_get(&wms->qa_sa, 1);
                  if (q_str != NULL && a_str != NULL) {
                    e = ms_modify_qa(&wms->qa_sa, &wms->ms, &need_sync);
                  }
                }
                break;
              case A_UPDATE_HTML:
                if (wms->ms.card_i >= 0 && (((wms->ms.card_l[wms->ms.card_i].card_state & 0x08) != 0) != (wms->ms.is_html > 0))) {
                  wms->ms.card_l[wms->ms.card_i].card_state = (wms->ms.card_l[wms->ms.card_i].card_state & 0x07) | (wms->ms.is_html > 0) << 3;
                  data_size = wms->ms.card_a * sizeof(struct Card);
                  index = wms->ms.cat_t[wms->ms.deck_i].cat_cli;
                  e = imf_put(&wms->ms.imf, index, wms->ms.card_l, data_size);
                  need_sync = 1;
                }
                break;
              case A_UPDATE_DECK_FLAGS:
                for (i = 0; i < wms->ms.deck_flags_n; i++) {
                  if (i < wms->ms.deck_a && wms->ms.cat_t[i].deck_slot_used == 1 && wms->ms.cat_t[i].deck_on != wms->ms.deck_flags[i]) {
                    wms->ms.cat_t[i].deck_on = wms->ms.deck_flags[i];
                    need_sync = 1;
                  }
                }
                while (i < wms->ms.deck_a) {
                  if (wms->ms.cat_t[i].deck_slot_used == 1 && wms->ms.cat_t[i].deck_on != 0) {
                    wms->ms.cat_t[i].deck_on = 0;
                    need_sync = 1;
                  }
                  i++;
                }
                if (need_sync == 1) {
                  data_size = sizeof(struct Deck) * wms->ms.deck_a;
                  e = imf_put(&wms->ms.imf, C_INDEX, wms->ms.cat_t, data_size);
                }
                break;
              case A_SYNC:
                if (need_sync == 1) {
                  e = wms->mctr != wms->ms.passwd.mctr ? E_MCTR : 0;
                  if (e == 0) {
                    wms->ms.passwd.mctr++;
                    data_size = sizeof(struct Password);
                    e = imf_put(&wms->ms.imf, PW_INDEX, &wms->ms.passwd, data_size);
                    if (e == 0) {
                      e = imf_sync(&wms->ms.imf);
                    }
                  }
                }
                break;
              case A_SYNC_OLD:
                if (need_sync == 1) {
                  assert(mtime_test != -1);
                  e = mtime_test != 1;
                  if (e == 0) {
                    wms->ms.passwd.mctr++;
                    data_size = sizeof(struct Password);
                    e = imf_put(&wms->ms.imf, PW_INDEX, &wms->ms.passwd, data_size);
                    if (e == 0) {
                      e = imf_sync(&wms->ms.imf);
                    }
                  } else {
                    wms->msg_header = "Error: Invalid mtime value";
                    wms->msg_btn_main = "OK";
                    wms->todo_main = S_SELECT_EDIT_DECK;
                    wms->page = P_MSG;
                  }
                }
                break;
              case A_INSERT:
                e = sa_set(&wms->ms.card_sa, 0, "");
                if (e == 0) {
                  e = sa_set(&wms->ms.card_sa, 1, "");
                  if (e == 0) {
                    e = imf_seek_unused(&wms->ms.imf, &index);
                    if (e == 0) {
                      data_size = sa_length(&wms->ms.card_sa);
                      e = imf_put(&wms->ms.imf, index, wms->ms.card_sa.sa_d, data_size);
                      if (e == 0) {
                        wms->ms.card_a++;
                        e = wms->ms.card_a >= DATA_SIZE_MAX / sizeof(struct Card) ? E_OVERFL_1 : 0;
                        if (e == 0) {
                          data_size = wms->ms.card_a * sizeof(struct Card);
                          wms->ms.card_l = realloc(wms->ms.card_l, data_size);
                          e = wms->ms.card_l == NULL;
                          if (e == 0) {
                            src = wms->ms.card_l + wms->ms.card_i;
                            dest = wms->ms.card_l + wms->ms.card_i + 1;
                            n = wms->ms.card_a - wms->ms.card_i - 1;
                            assert(n > 0);
                            size = n * sizeof(struct Card);
                            memmove(dest, src, size);
                            wms->ms.card_l[wms->ms.card_i].card_time = wms->ms.timestamp;
                            assert(wms->ms.card_l[wms->ms.card_i].card_time >= 0);
                            wms->ms.card_l[wms->ms.card_i].card_strength = 60;
                            wms->ms.card_l[wms->ms.card_i].card_qai = index;
                            wms->ms.card_l[wms->ms.card_i].card_state = STATE_NEW | STATE_HTML;
                            e = imf_put(&wms->ms.imf, wms->ms.cat_t[wms->ms.deck_i].cat_cli, wms->ms.card_l, data_size);
                            if (e == 0) {
                              need_sync = 1;
                              wms->page = P_EDIT;
                            }
                          }
                        }
                      }
                    }
                  }
                }
                break;
              case A_APPEND:
                e = sa_set(&wms->ms.card_sa, 0, "");
                if (e == 0) {
                  e = sa_set(&wms->ms.card_sa, 1, "");
                  if (e == 0) {
                    e = imf_seek_unused(&wms->ms.imf, &index);
                    if (e == 0) {
                      data_size = sa_length(&wms->ms.card_sa);
                      e = imf_put(&wms->ms.imf, index, wms->ms.card_sa.sa_d, data_size);
                      if (e == 0) {
                        wms->ms.card_i = wms->ms.card_a;
                        wms->ms.card_a++;
                        e = wms->ms.card_a >= DATA_SIZE_MAX / sizeof(struct Card) ? E_OVERFL_2 : 0;
                        if (e == 0) {
                          data_size = wms->ms.card_a * sizeof(struct Card);
                          wms->ms.card_l = realloc(wms->ms.card_l, data_size);
                          e = wms->ms.card_l == NULL;
                          if (e == 0) {
                            wms->ms.card_l[wms->ms.card_i].card_time = wms->ms.timestamp;
                            assert(wms->ms.card_l[wms->ms.card_i].card_time >= 0);
                            wms->ms.card_l[wms->ms.card_i].card_strength = 60;
                            wms->ms.card_l[wms->ms.card_i].card_qai = index;
                            wms->ms.card_l[wms->ms.card_i].card_state = STATE_NEW | STATE_HTML;
                            cat_ptr = wms->ms.cat_t + wms->ms.deck_i;
                            e = imf_put(&wms->ms.imf, cat_ptr->cat_cli, wms->ms.card_l, data_size);
                            need_sync = 1;
                            wms->page = P_EDIT;
                          }
                        }
                      }
                    }
                  }
                }
                break;
              case A_ASK_DELETE_CARD:
                wms->msg_header = "Delete Item?";
                wms->msg_btn_main = "Delete";
                wms->msg_btn_alt = "Cancel";
                wms->page = P_MSG;
                wms->mode = M_MSG_CARD;
                break;
              case A_DELETE_CARD:
                if (wms->ms.card_a > 0 && wms->ms.card_i >= 0 && wms->ms.card_i < wms->ms.card_a) {
                  card_ptr = wms->ms.card_l + wms->ms.card_i;
                  e = imf_delete(&wms->ms.imf, card_ptr->card_qai);
                  if (e == 0) {
                    wms->ms.card_a--;
                    dest = wms->ms.card_l + wms->ms.card_i;
                    src = wms->ms.card_l + wms->ms.card_i + 1;
                    n = wms->ms.card_a - wms->ms.card_i;
                    if (n > 0) {
                      size = n * sizeof(struct Card);
                      memmove(dest, src, size);
                    }
                    if (wms->ms.card_i == wms->ms.card_a) {
                      wms->ms.card_i--;
                    }
                    data_size = wms->ms.card_a * sizeof(struct Card);
                    cat_ptr = wms->ms.cat_t + wms->ms.deck_i;
                    e = imf_put(&wms->ms.imf, cat_ptr->cat_cli, wms->ms.card_l, data_size);
                    if (e == 0) {
                      need_sync = 1;
                      e = ms_get_card_sa(&wms->ms);
                      if (e == 0) {
                        wms->page = P_EDIT;
                      }
                    }
                  }
                }
                break;
              case A_PREVIOUS:
                if (wms->ms.card_a > 0) {
                  wms->ms.card_i--;
                  if (wms->ms.card_i < 0) {
                    wms->ms.card_i = 0;
                  }
                  assert(wms->ms.card_i < wms->ms.card_a);
                } else {
                  wms->ms.card_i = -1;
                }
                if (wms->ms.card_i != -1) {
                  e = ms_get_card_sa(&wms->ms);
                  wms->page = P_EDIT;
                }
                break;
              case A_NEXT:
                if (wms->ms.card_a > 0) {
                  wms->ms.card_i++;
                  assert(wms->ms.card_i >= 0);
                  if (wms->ms.card_i >= wms->ms.card_a) {
                    wms->ms.card_i = wms->ms.card_a - 1;
                  }
                } else {
                  wms->ms.card_i = -1;
                }
                if (wms->ms.card_i != -1) {
                  e = ms_get_card_sa(&wms->ms);
                  wms->page = P_EDIT;
                }
                break;
              case A_SCHEDULE:
                e = (wms->ms.card_l[wms->ms.card_i].card_state & 0x07) < STATE_NEW ? E_STATE : 0;
                if (e == 0) {
                  wms->ms.card_l[wms->ms.card_i].card_state = (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) | STATE_SCHEDULED;
                  data_size = wms->ms.card_a * sizeof(struct Card);
                  index = wms->ms.cat_t[wms->ms.deck_i].cat_cli;
                  e = imf_put(&wms->ms.imf, index, wms->ms.card_l, data_size);
                  need_sync = 1;
                  wms->page = P_EDIT;
                }
                break;
              case A_SET:
                wms->ms.mov_card_i = wms->ms.card_i;
                wms->page = P_EDIT;
                break;
              case A_CARD_ARRANGE:
                wms->page = P_SELECT_ARRANGE;
                wms->mode = M_CARD;
                break;
              case A_MOVE_CARD:
                e = wms->ms.mov_card_i < 0 || wms->ms.mov_card_i >= wms->ms.card_a;
                if (e == 0) {
                  size = sizeof(struct Card);
                  memcpy(&card, wms->ms.card_l + wms->ms.mov_card_i, size);
                  dest = wms->ms.card_l + wms->ms.mov_card_i;
                  src = dest + sizeof(struct Card);
                  n = wms->ms.card_a - wms->ms.mov_card_i - 1;
                  if (n > 0) {
                    size = n * sizeof(struct Card);
                    memmove(dest, src, size);
                  }
                  card_i = wms->ms.card_i;
                  if (card_i > wms->ms.mov_card_i) {
                    card_i--;
                  }
                  if (wms->ms.arrange == 2) {
                    card_i++;
                  } else {
                    e = wms->ms.arrange != 0;
                  }
                  if (e == 0) {
                    src = wms->ms.card_l + card_i;
                    dest = src + sizeof(struct Card);
                    n = wms->ms.card_a - card_i - 1;
                    if (n > 0) {
                      size = n * sizeof(struct Card);
                      memmove(dest, src, size);
                    }
                    size = sizeof(struct Card);
                    memcpy(wms->ms.card_l + card_i, &card, size);
                    data_size = wms->ms.card_a * sizeof(struct Card);
                    e = imf_put(&wms->ms.imf, wms->ms.cat_t[wms->ms.deck_i].cat_cli, wms->ms.card_l, data_size);
                    if (e == 0) {
                      need_sync = 1;
                      wms->ms.card_i = card_i;
                      e = ms_get_card_sa(&wms->ms);
                      if (e == 0) {
                        wms->ms.mov_card_i = -1;
                        wms->page = P_EDIT;
                      }
                    }
                  }
                }
                break;
              case A_SEND_CARD:
                e = wms->ms.mov_deck_i == wms->ms.deck_i;
                if (e == 0) {
                  e = wms->ms.mov_deck_i < 0 || wms->ms.mov_deck_i >= wms->ms.deck_a || wms->ms.cat_t[wms->ms.mov_deck_i].deck_slot_used == 0 ? E_SEND : 0;
                  if (e == 0) {
                    index = wms->ms.cat_t[wms->ms.mov_deck_i].cat_cli;
                    data_size = imf_get_size(&wms->ms.imf, index);
                    e = data_size <= 0;
                    if (e == 0) {
                      mov_card_a = data_size / sizeof(struct Card);
                      e = wms->ms.mov_card_i < 0 || wms->ms.mov_card_i >= mov_card_a;
                      if (e == 0) {
                        mov_card_l = malloc(data_size);
                        e = mov_card_l == NULL;
                        if (e == 0) {
                          e = imf_get(&wms->ms.imf, index, mov_card_l);
                          if (e == 0) {
                            size = sizeof(struct Card);
                            memcpy(&card, mov_card_l + wms->ms.mov_card_i, size);
                            mov_card_a--;
                            dest = mov_card_l + wms->ms.mov_card_i;
                            src = mov_card_l + wms->ms.mov_card_i + 1;
                            n = mov_card_a - wms->ms.mov_card_i;
                            if (n > 0) {
                              size = n * sizeof(struct Card);
                              memmove(dest, src, size);
                            }
                            if (wms->ms.mov_card_i == mov_card_a) {
                              wms->ms.mov_card_i--;
                            }
                            data_size = mov_card_a * sizeof(struct Card);
                            e = imf_put(&wms->ms.imf, index, mov_card_l, data_size);
                            if (e == 0) {
                              wms->ms.card_i = wms->ms.card_a;
                              wms->ms.card_a++;
                              data_size = wms->ms.card_a * sizeof(struct Card);
                              wms->ms.card_l = realloc(wms->ms.card_l, data_size);
                              e = wms->ms.card_l == NULL;
                              if (e == 0) {
                                src = &card;
                                dest = wms->ms.card_l + wms->ms.card_i;
                                size = sizeof(struct Card);
                                memcpy(dest, src, size);
                                index = wms->ms.cat_t[wms->ms.deck_i].cat_cli;
                                e = imf_put(&wms->ms.imf, index, wms->ms.card_l, data_size);
                              }
                            }
                            if (e == 0) {
                              wms->ms.deck_i = wms->ms.mov_deck_i;
                              wms->ms.mov_deck_i = -1;
                              wms->ms.card_i = wms->ms.mov_card_i;
                              wms->ms.mov_card_i = -1;
                              free(wms->ms.card_l);
                              wms->ms.card_l = mov_card_l;
                              mov_card_l = NULL;
                              wms->ms.card_a = mov_card_a;
                              e = ms_get_card_sa(&wms->ms);
                              if (e == 0) {
                                need_sync = 1;
                                if (wms->seq == S_SEND_CARD) {
                                  wms->page = P_EDIT;
                                } else {
                                  e = wms->seq != S_PROCEED_SEND_CARD;
                                }
                              }
                            }
                          }
                          free(mov_card_l);
                        }
                      }
                    }
                  }
                } else {
                  wms->msg_header = "Same deck";
                  wms->msg_static = "The destination deck must be different from the current deck of the card";
                  wms->msg_btn_main = "OK";
                  wms->page = P_MSG;
                  wms->mode = M_MSG_CARD;
                }
                break;
              case A_SELECT_LEARN_CAT:
                wms->ms.card_i = -1;
                wms->page = P_SELECT_DECK;
                wms->mode = M_LEARN;
                break;
              case A_SELECT_SEARCH_CAT:
                wms->ms.card_i = -1;
                wms->page = P_SELECT_DECK;
                wms->mode = M_SEARCH;
                break;
              case A_PREFERENCES:
                wms->page = P_PREFERENCES;
                break;
              case A_ABOUT:
                wms->page = P_ABOUT;
                break;
              case A_APPLY:
                assert(wms->timeout >= 0 && wms->timeout < 5);
                size = sizeof(struct Timeout);
                memcpy(&wms->ms.passwd.timeout, timeouts + wms->timeout, size);
                need_sync = 1;
                wms->page = P_START;
                break;
              case A_SEARCH:
                if (wms->ms.search_txt == NULL) {
                  wms->ms.search_txt = malloc(1);
                  e = wms->ms.search_txt == NULL;
                  if (e == 0) {
                    wms->ms.search_txt[0] = '\0';
                  }
                }
                if (e == 0) {
                  size = strlen(wms->ms.search_txt) + 1;
                  lwr_search_txt = malloc(size);
                  e = lwr_search_txt == NULL;
                  if (e == 0) {
                    strcpy(lwr_search_txt, wms->ms.search_txt);
                    if (wms->ms.match_case < 0) {
                      str_tolower(lwr_search_txt);
                    }
                    wms->found_str = NULL;
                    search_deck_i = wms->ms.deck_i;
                    assert(wms->ms.card_i >= -1);
                    if (wms->ms.card_a > 0 && wms->ms.card_i == -1) {
                      wms->ms.card_i = 0;
                    }
                    search_card_i = wms->ms.card_i;
                    do {
                      if (wms->ms.search_dir != 0) {
                        wms->ms.card_i += wms->ms.search_dir;
                        if (wms->ms.card_i < 0) {
                          if (wms->ms.scope == C_ALL) {
                            do {
                              wms->ms.deck_i--;
                              if (wms->ms.deck_i < 0) {
                                assert(wms->ms.deck_a > 0);
                                wms->ms.deck_i = wms->ms.deck_a - 1;
                              }
                            } while (wms->ms.cat_t[wms->ms.deck_i].deck_slot_used == 0);
                            e = ms_load_card_list(&wms->ms);
                          }
                          wms->ms.card_i = -1;
                          if (wms->ms.card_a > 0) {
                            wms->ms.card_i = wms->ms.card_a - 1;
                          }
                        }
                        if (wms->ms.card_i >= wms->ms.card_a) {
                          if (wms->ms.scope == C_ALL) {
                            do {
                              wms->ms.deck_i++;
                              if (wms->ms.deck_i >= wms->ms.deck_a) {
                                wms->ms.deck_i = 0;
                              }
                            } while (wms->ms.cat_t[wms->ms.deck_i].deck_slot_used == 0);
                            e = ms_load_card_list(&wms->ms);
                          }
                          wms->ms.card_i = -1;
                          if (wms->ms.card_a > 0) {
                            wms->ms.card_i = 0;
                          }
                        }
                        assert(wms->ms.card_i >= -1);
                        if (wms->ms.card_a > 0) {
                          assert(wms->ms.card_i >= 0 && wms->ms.card_i < wms->ms.card_a);
                          e = ms_get_card_sa(&wms->ms);
                          if (e == 0) {
                            q_str = sa_get(&wms->ms.card_sa, 0);
                            e = q_str == NULL;
                            if (e == 0) {
                              if (wms->ms.match_case < 0) {
                                str_tolower(q_str);
                              }
                              wms->found_str = strstr(q_str, lwr_search_txt);
                              if (wms->found_str == NULL) {
                                a_str = sa_get(&wms->ms.card_sa, 1);
                                e = a_str == NULL;
                                if (e == 0) {
                                  if (wms->ms.match_case < 0) {
                                    str_tolower(a_str);
                                  }
                                  wms->found_str = strstr(a_str, lwr_search_txt);
                                }
                              }
                            }
                          }
                        }
                      }
                    } while (wms->found_str == NULL && !(wms->ms.scope == C_ALL ? wms->ms.card_i == search_card_i && wms->ms.deck_i == search_deck_i : wms->ms.card_i == search_card_i) && e == 0);
                    e = ms_get_card_sa(&wms->ms);
                    free(lwr_search_txt);
                  }
                }
                wms->page = P_SEARCH;
                break;
              case A_PREVIEW:
                wms->page = P_PREVIEW;
                break;
              case A_RANK:
                assert(wms->ms.rank >= 0 && wms->ms.rank <= 20);
                e = wms->ms.rank < 0;
                if (e == 0) {
                  if (wms->ms.passwd.rank != wms->ms.rank) {
                    wms->ms.passwd.rank = wms->ms.rank;
                    need_sync = 1;
                  }
                }
                break;
              case A_DETERMINE_CARD:
                e = ms_determine_card(&wms->ms);
                if (e == 0) {
                  assert(wms->ms.deck_i >= 0 && wms->ms.card_i >= 0);
                  e = ms_load_card_list(&wms->ms);
                  if (e == 0) {
                    e = ms_get_card_sa(&wms->ms);
                    if (e == 0) {
                      wms->page = P_LEARN;
                      wms->mode = M_ASK;
                    }
                  }
                } else if (e == -1) {
                  wms->msg_header = "Notification";
                  wms->msg_static = "No card eligible for repetition.";
                  wms->msg_btn_main = "OK";
                  wms->msg_btn_alt = "Table";
                  wms->page = P_MSG;
                  wms->mode = M_MSG_NO_CARD_ELIGIBLE;
                }
                break;
              case A_SHOW:
                assert(wms->ms.timestamp >= 0);
                e = ms_get_card_sa(&wms->ms);
                if (e == 0) {
                  wms->page = P_LEARN;
                  wms->mode = M_RATE;
                }
                break;
              case A_REVEAL:
                e = ms_get_card_sa(&wms->ms);
                if (e == 0) {
                  a_str = sa_get(&wms->ms.card_sa, 1);
                  e = a_str == NULL;
                  if (e == 0) {
                    len = strlen(a_str);
                    e = len > INT32_MAX;
                    if (e == 0) {
                      assert(wms->saved_reveal_pos < 0 || wms->saved_reveal_pos <= len);
                      i = wms->saved_reveal_pos < 0 ? 0 : wms->saved_reveal_pos;
                      e = utf8_strcspn(a_str + i, " ,·.-‧_", &n);
                      if (e == 0) {
                        wms->reveal_pos = i + n;
                        if (wms->reveal_pos < len) {
                          len = utf8_char_len(a_str + wms->reveal_pos);
                          e = len == 0;
                          if (e == 0) {
                            wms->reveal_pos += len;
                            size = wms->reveal_pos + 8 + 1; // "--more--" + '\0'
                            str = malloc(size);
                            e = str == NULL;
                            if (e == 0) {
                              strncpy(str, a_str, wms->reveal_pos);
                              str[wms->reveal_pos] = '\0';
                              strcat(str, "--more--");
                              e = sa_set(&wms->ms.card_sa, 1, str);
                              free(str);
                              wms->page = P_LEARN;
                              wms->mode = M_ASK;
                            }
                          }
                        } else {
                          assert(wms->reveal_pos == len);
                          wms->reveal_pos = -1;
                          wms->page = P_LEARN;
                          wms->mode = M_RATE;
                        }
                      }
                    }
                  }
                }
                break;
              case A_PROCEED:
                assert(wms->ms.deck_i >= 0 && wms->ms.deck_i < wms->ms.deck_a && wms->ms.cat_t[wms->ms.deck_i].deck_slot_used != 0);
                assert(wms->ms.timestamp >= 0);
                e = wms->ms.lvl < 0 || wms->ms.lvl > 20 ? E_LVL_1 : 0;
                if (e == 0) {
                  card_ptr = wms->ms.card_l + wms->ms.card_i;
                  if ((card_ptr->card_state & 0x07) == STATE_NEW || (card_ptr->card_state & 0x07) == STATE_SUSPENDED) {
                    card_ptr->card_state = (card_ptr->card_state & 0x08) | STATE_SCHEDULED;
                  }
                  card_ptr->card_strength = lvl_s[wms->ms.lvl]; // S = -t / log(R)
                  card_ptr->card_time = wms->ms.timestamp;
                  assert((card_ptr->card_state & 0x07) == STATE_SCHEDULED);
                  data_size = wms->ms.card_a * sizeof(struct Card);
                  e = imf_put(&wms->ms.imf, wms->ms.cat_t[wms->ms.deck_i].cat_cli, wms->ms.card_l, data_size);
                  need_sync = 1;
                }
                break;
              case A_ASK_SUSPEND:
                wms->msg_header = "Suspend?";
                wms->msg_static = "Suspend this card from learning?";
                wms->msg_btn_main = "Suspend";
                wms->msg_btn_alt = "Cancel";
                wms->page = P_MSG;
                wms->mode = M_MSG_SUSPEND;
                break;
              case A_SUSPEND:
                if ((wms->ms.card_l[wms->ms.card_i].card_state & 0x07) == STATE_SUSPENDED) {
                  wms->ms.card_l[wms->ms.card_i].card_time = wms->ms.timestamp;
                } else {
                  wms->ms.card_l[wms->ms.card_i].card_state = (wms->ms.card_l[wms->ms.card_i].card_state & 0x08) | STATE_SUSPENDED;
                }
                data_size = wms->ms.card_a * sizeof(struct Card);
                index = wms->ms.cat_t[wms->ms.deck_i].cat_cli;
                e = imf_put(&wms->ms.imf, index, wms->ms.card_l, data_size);
                need_sync = 1;
                break;
              case A_ASK_RESUME:
                wms->msg_header = "Resume?";
                wms->msg_static = "Resume all suspended cards of this deck?";
                wms->msg_btn_main = "Resume";
                wms->msg_btn_alt = "Cancel";
                wms->page = P_MSG;
                wms->mode = M_MSG_RESUME;
                break;
              case A_RESUME:
                e = wms->ms.card_a > 0 ? 0 : E_CARD_8; // empty
                if (e == 0) {
                  n = 0;
                  for (card_i = 0; card_i < wms->ms.card_a; card_i++) {
                    if ((wms->ms.card_l[card_i].card_state & 0x07) == STATE_SUSPENDED) {
                      wms->ms.card_l[card_i].card_state = (wms->ms.card_l[card_i].card_state & 0x08) | STATE_SCHEDULED;
                      n++;
                    }
                  }
                  e = n > 0 ? 0 : E_CARD_9; // no card scheduled
                  if (e == 0) {
                    data_size = wms->ms.card_a * sizeof(struct Card);
                    index = wms->ms.cat_t[wms->ms.deck_i].cat_cli;
                    e = imf_put(&wms->ms.imf, index, wms->ms.card_l, data_size);
                    need_sync = 1;
                  }
                }
                break;
              case A_CHECK_FILE:
                e = wms->file_title_str == NULL;
                if (e != 0) {
                  wms->msg_header = "Please select a file.";
                  wms->msg_btn_main = "OK";
                  wms->todo_main = S_FILELIST;
                  wms->page = P_MSG;
                }
                break;
              case A_LOGIN:
                wms->page = P_PASSWORD;
                wms->mode = wms->seq == S_GO_CHANGE ? M_CHANGE_PASSWD : M_DEFAULT;
                break;
              case A_HISTOGRAM:
                for (i = 0; i < 100; i++)
                  wms->hist_bucket[i] = 0;
                if (wms->ms.card_a > 0) {
                  assert(wms->ms.timestamp >= 0);
                  for (card_i = 0; card_i < wms->ms.card_a; card_i++) {
                    if ((wms->ms.card_l[card_i].card_state & 0x07) == STATE_SCHEDULED) {
                      time_diff = wms->ms.timestamp - wms->ms.card_l[card_i].card_time;
                      retent = exp(-(double)time_diff / wms->ms.card_l[card_i].card_strength);
                      i = retent * 100;
                      assert(i >= 0 && i < 100);
                      wms->hist_bucket[i]++;
                    }
                  }
                  wms->hist_max = 0;
                  for (i = 0; i < 100; i++)
                    if (wms->hist_bucket[i] > wms->hist_max)
                      wms->hist_max = wms->hist_bucket[i];
                  wms->page = P_HISTOGRAM;
                }
                break;
              case A_TABLE:
                for (i = 0; i < 21; i++) {
                  for (j = 0; j < 2; j++) {
                    wms->lvl_bucket[j][i] = 0;
                  }
                }
                for (i = 0; i < 4; i++) {
                  wms->count_bucket[i] = 0;
                }
                wms->checked_decks = 0;
                deck_i = wms->ms.deck_i;
                for (wms->ms.deck_i = 0; wms->ms.deck_i < wms->ms.deck_a && e == 0; wms->ms.deck_i++) {
                  if (wms->ms.cat_t[wms->ms.deck_i].deck_slot_used != 0 && wms->ms.cat_t[wms->ms.deck_i].deck_on != 0) {
                    wms->checked_decks++;
                    e = ms_load_card_list(&wms->ms);
                    if (e == 0) {
                      if (wms->ms.card_a > 0) {
                        for (card_i = 0; card_i < wms->ms.card_a; card_i++) {
                          wms->count_bucket[wms->ms.card_l[card_i].card_state & 0x03]++;
                          if ((wms->ms.card_l[card_i].card_state & 0x07) == STATE_SCHEDULED) {
                            for (i = 0; i < 21; i++) {
                              if (lvl_s[i] >= wms->ms.card_l[card_i].card_strength)
                                break;
                            }
                            wms->lvl_bucket[0][i]++;
                            time_diff = wms->ms.timestamp - wms->ms.card_l[card_i].card_time;
                            retent = exp(-(double)time_diff / wms->ms.card_l[card_i].card_strength);
                            if (retent <= 1 / M_E) {
                              wms->lvl_bucket[1][i]++;
                            }
                          }
                        }
                      }
                    }
                  }
                }
                wms->ms.deck_i = deck_i;
                wms->page = P_TABLE;
                break;
              }
            }
            free(wms->ms.password);
            wms->ms.password = NULL;
          }
          e2str(e, e_str);
          saved_e = e;
          rv = fprintf(dbg_stream != NULL ? dbg_stream : stderr, "%s \"%s\"\n", e_str, wms->dbg_lp);
          e = rv < 0;
          if (e == 0 && dbg_stream != NULL) {
            e = fclose(dbg_stream);
          }
          if (saved_e != 0 && wms->page != P_MSG) {
            free(wms->file_title_str);
            wms->file_title_str = NULL;
            free(wms->ms.imf_filename);
            wms->ms.imf_filename = NULL;
            wms->msg_header = "Unexpected error";
            wms->msg_static = e_str;
            wms->msg_btn_main = "OK";
            wms->todo_main = S_NONE;
            wms->page = P_MSG;
          }
          if (e == 0 || wms->page == P_MSG) {
            e = gen_html(wms);
          }
          if (e != 0 && saved_e != 0) {
            e = saved_e;
          }
          wms_free(wms);
        }
        free(wms);
      }
    }
    if (e != 0) {
      e2str(e, e_str);
      fprintf(stderr, "unreported error: %s\n", e_str);
    }
  } while (IS_SERVER && e == 0);
  return e;
}