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term.c
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term.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdarg.h>
#include "term.h"
#include "default.h"
#include "cs_vtg.h"
#include "cs_437.h"
#define MAX(A, B) ((A) > (B) ? (A) : (B))
#define CLEARWRAP do{ if (term->col >= term->cols) term->col = term->cols-1; }while(0)
#define CLIPROW(X) if (term->row<0 || term->row >= term->rows) term->row = X
#define CLIPCOL(X) if (term->col<0 || term->col >= term->cols) term->col = X
static int verbose = 0;
static void
logfmt(char *fmt, ...)
{
va_list args;
va_start(args, fmt);
if (verbose)
vfprintf(stderr, fmt, args);
va_end(args);
}
void
set_verbosity(int level)
{
verbose = level;
}
static void
save_cursor(Term *term)
{
term->save_cursor.row = term->row;
term->save_cursor.col = term->col;
}
static void
load_cursor(Term *term)
{
term->row = term->save_cursor.row;
term->col = term->save_cursor.col;
}
static void
save_misc(Term *term)
{
term->save_misc.row = term->row;
term->save_misc.col = term->col;
term->save_misc.origin_on = term->mode & M_ORIGIN;
term->save_misc.attr = term->attr;
term->save_misc.pair = term->pair;
term->save_misc.cs_array[0] = term->cs_array[0];
term->save_misc.cs_array[1] = term->cs_array[1];
term->save_misc.cs_index = term->cs_index;
}
static void
load_misc(Term *term)
{
term->row = term->save_misc.row;
term->col = term->save_misc.col;
if (term->save_misc.origin_on)
term->mode |= M_ORIGIN;
else
term->mode &= ~M_ORIGIN;
term->attr = term->save_misc.attr;
term->pair = term->save_misc.pair;
term->cs_array[0] = term->save_misc.cs_array[0];
term->cs_array[1] = term->save_misc.cs_array[1];
term->cs_index = term->save_misc.cs_index;
}
void
set_default_palette(char * pname)
{
static struct {
char * name;
uint8_t * plt;
} pal[] = {
{ "xterm", plt_xterm },
{ "vga", plt_vga_ansi },
{ "sol_ansi", plt_solarized_like_ansi },
{ "solarized", plt_solarized },
{ "putty", plt_putty },
{ 0, 0}
};
if (pname[0] == '@') {
int i;
for(i=0; pal[i].name; i++) {
if (strcasecmp(pname+1, pal[i].name) == 0) {
def_plt = pal[i].plt;
return;
}
}
fprintf(stderr, "Known standard palette names are:\n");
for(i=0; pal[i].name; i++)
fprintf(stderr, " @%s\n", pal[i].name);
exit(2);
} else {
FILE * fd;
char buf[BUFSIZ];
Term * term = 0;
uint8_t * plt = malloc(sizeof(term->plt));
memcpy(plt, def_plt, sizeof(term->plt));
def_plt = plt;
if ((fd = fopen(pname, "r")) == 0) {
perror(pname); exit(1);
}
while (fgets(buf, sizeof(buf), fd) != 0) {
char * s = buf, *e;
long cno = 0, colour = 0;
while (*s == ' ' || *s == '\t') s++;
if (*s == '#') continue;
if (strncasecmp(s, "color", 5) == 0) {
s += 5;
} else if (strncasecmp(s, "colour", 6) == 0) {
s += 6;
} else continue;
// Only lines that match /^ *colou?r[0-9]+/i
if (*s < '0' || *s > '9') continue;
cno = strtol(s, &e, 0);
if (s == e) goto bad_line;
if (cno < 0 || cno > 16) goto bad_line;
s = e;
while (*s == ' ' || *s == '\t' || *s == '#' || *s == '=') s++;
colour = strtol(s, &e, 16);
if (e-s != 6) goto bad_line;
plt[cno*3+0] = ((colour>>16) & 0xFF);
plt[cno*3+1] = ((colour>> 8) & 0xFF);
plt[cno*3+2] = ((colour ) & 0xFF);
continue;
bad_line:
fprintf(stderr, "Bad line in colour file: %s", buf);
exit(2);
}
fclose(fd);
}
return;
}
static void
reset(Term *term)
{
int i, j;
term->row = term->col = 0;
term->top = 0;
term->bot = term->rows - 1;
term->mode = def_mode;
term->attr = def_attr;
term->pair = def_pair;
term->cs_array[0] = CS_BMP;
term->cs_array[1] = CS_VTG;
term->cs_index = 0;
term->state = S_ANY;
term->parlen = 0;
if (memcmp(term->plt, def_plt, sizeof(term->plt) != 0)) {
term->plt_dirty = 1;
}
memcpy(term->plt, def_plt, sizeof(term->plt));
term->plt_local = 0;
for (i = 0; i < term->rows; i++) {
term->addr[i] = &term->cells[i*term->cols];
for (j = 0; j < term->cols; j++)
term->addr[i][j] = (Cell) {EMPTY, def_attr, def_pair};
}
save_cursor(term);
save_misc(term);
}
Term *
new_term(int rows, int cols)
{
size_t size = sizeof(Term) + rows*sizeof(Cell *) + rows*cols*sizeof(Cell);
Term *term = malloc(size);
if (!term)
return NULL;
term->rows = rows;
term->cols = cols;
term->addr = (Cell **) &term[1];
term->cells = (Cell *) &term->addr[rows];
reset(term);
term->plt_dirty = 0;
return term;
}
static uint16_t
char_code(Term *term)
{
int i;
uint16_t code = term->partial[0] & ((1 << (8 - term->parlen)) - 1);
for (i = 1; i < term->parlen; i++)
code = (code << 6) | (term->partial[i] & 0x3F);
return code;
}
static int
within_bounds(Term *term, int row, int col)
{
if (row < 0 || row >= term->rows || col < 0 || col > term->cols) {
logfmt("position %d,%d is out of bounds %d,%d\n",
row+1, col+1, term->rows, term->cols);
return 0;
} else {
return 1;
}
}
/* Move lines down and put a blank line at the top. */
static void
scroll_up(Term *term)
{
int row, col;
Cell *addr;
if (!within_bounds(term, term->top, 0))
return;
if (!within_bounds(term, term->bot, 0))
return;
addr = term->addr[term->bot];
for (row = term->bot; row > term->top; row--)
term->addr[row] = term->addr[row-1];
term->addr[term->top] = addr;
for (col = 0; col < term->cols; col++)
term->addr[term->top][col] = BLANK;
}
/* Move lines up and put a blank line at the bottom. */
static void
scroll_down(Term *term)
{
int row, col;
Cell *addr;
if (!within_bounds(term, term->top, 0))
return;
if (!within_bounds(term, term->bot, 0))
return;
addr = term->addr[term->top];
for (row = term->top; row < term->bot; row++)
term->addr[row] = term->addr[row+1];
term->addr[term->bot] = addr;
for (col = 0; col < term->cols; col++)
term->addr[term->bot][col] = BLANK;
}
static void
addchar(Term *term, uint16_t code)
{
Cell cell = (Cell) {code, term->attr, term->pair};
if (term->col >= term->cols) {
if (term->mode & M_AUTOWRAP) {
term->col = 0;
if (term->row < term->bot)
term->row++;
else
scroll_down(term);
} else {
term->col = term->cols - 1;
}
}
if (!within_bounds(term, term->row, term->col))
return;
if (term->mode & M_INSERT) {
Cell next;
int col;
for (col = term->col; col < term->cols; col++) {
next = term->addr[term->row][col];
term->addr[term->row][col] = cell;
cell = next;
}
} else {
term->addr[term->row][term->col] = cell;
}
term->col++;
}
static void
linefeed(Term *term)
{
if (term->row == term->bot)
scroll_down(term);
else
term->row++;
if (term->mode & M_NEWLINE)
term->col = 0;
}
static void
ctrlchar(Term *term, uint8_t byte)
{
switch (byte) {
case 0x08:
CLEARWRAP;
if (term->col) term->col--;
break;
case 0x09:
/* TODO: See ESC Sequence H (HTS) */
term->col &= ~7; term->col += 8;
CLIPCOL(term->cols-1);
break;
case 0x0A: case 0x0B: case 0x0C:
CLEARWRAP;
linefeed(term);
break;
case 0x0D:
term->col = 0;
break;
case 0x0E:
term->cs_index = 1;
break;
case 0x0F:
term->cs_index = 0;
break;
}
}
static void
escseq(Term *term, uint8_t byte)
{
uint8_t first, second;
if (term->parlen) {
first = *term->partial;
second = byte;
} else {
first = byte;
second = 0;
}
switch (first) {
case 'c':
reset(term);
break;
case 'D':
CLEARWRAP;
if (term->row == term->bot)
scroll_down(term);
else
term->row++;
break;
case 'E':
CLEARWRAP;
if (term->row == term->bot) {
scroll_down(term);
term->col = 0;
} else {
term->row++;
}
break;
case 'H':
/* TODO: set tab stop at current column */
logfmt("NYI: ESC Sequence H (HTS)\n");
break;
case 'M':
if (term->row == term->top)
scroll_up(term);
else
term->row--;
break;
case 'Z':
/* Identify Terminal (DECID) */
/* if we were a real terminal, we'd reply with "ESC [ ? 6 c" */
/* since there is no application listening, we can ignore this */
break;
case '7':
CLEARWRAP;
save_misc(term);
break;
case '8':
CLEARWRAP;
load_misc(term);
break;
case '%':
/* TODO: select charset */
logfmt("NYI: ESC Sequence %% (character set selection)\n");
switch(second)
{
case '8': /* Linux switch to UTF8 */
case 'G': /* DOCS: Designate other coding system */
term->mode &= ~M_ISOLAT1;
if (term->cs_array[0] == CS_ISO)
term->cs_array[0] = CS_BMP;
if (term->cs_array[1] == CS_ISO)
term->cs_array[1] = CS_BMP;
break;
case '@': /* DOCS, Standard return */
term->mode |= M_ISOLAT1;
if (term->cs_array[0] == CS_BMP)
term->cs_array[0] = CS_ISO;
if (term->cs_array[1] == CS_BMP)
term->cs_array[1] = CS_ISO;
break;
}
break;
case '#':
switch(second)
{
case '8':
{
int i, j;
for (i = 0; i < term->rows; i++) {
for (j = 0; j < term->cols; j++) {
term->addr[i][j] = (Cell) {'E', def_attr, def_pair};
}
}
}
break;
default:
/* TODO */
logfmt("NYI: ESC Sequence # 3..6 DECDWL etc\n");
break;
}
break;
case '(':
switch (second) {
case 'B':
term->cs_array[0] = (term->mode&M_ISOLAT1)?CS_ISO:CS_BMP;
break;
case '0':
term->cs_array[0] = CS_VTG;
break;
case 'U':
term->cs_array[0] = CS_437;
break;
case 'K':
logfmt("UNS: user-defined mapping\n");
term->cs_array[0] = (term->mode&M_ISOLAT1)?CS_ISO:CS_BMP;
break;
}
break;
case ')':
switch (second) {
case 'B':
term->cs_array[1] = (term->mode&M_ISOLAT1)?CS_ISO:CS_BMP;
break;
case '0':
term->cs_array[1] = CS_VTG;
break;
case 'U':
term->cs_array[1] = CS_437;
break;
case 'K':
logfmt("UNS: user-defined mapping\n");
term->cs_array[1] = (term->mode&M_ISOLAT1)?CS_ISO:CS_BMP;
break;
}
break;
case '>':
/* TODO: set numeric keypad mode */
logfmt("NYI: ESC Sequence > (DECPNM)\n");
break;
case '=':
/* TODO: set application keypad mode */
logfmt("NYI: ESC Sequence = (DECPAM)\n");
break;
default:
logfmt("UNS: ESC Sequence %c\n", first);
}
}
static int
do_linux_osc(Term *term)
{
int i;
uint8_t buf[4] = {0,0,0,0};
if (term->partial[0] == 'R')
{
if (memcmp(term->plt, def_plt, sizeof(term->plt) != 0))
term->plt_dirty = 1;
memcpy(term->plt, def_plt, sizeof(term->plt));
term->plt_local = 0;
return 1;
}
if (term->partial[0] != 'P' || term->parlen != 8)
return 0;
for (i=1; i<8; i++) {
/* isxdigit is locale broken */
int ch = term->partial[i];
if (ch >= '0' && ch <= '9')
buf[i>>1] = (buf[i>>1] << 4) + (ch - '0');
else if (ch >= 'a' && ch <= 'f')
buf[i>>1] = (buf[i>>1] << 4) + (ch - 'a' + 10);
else if (ch >= 'A' && ch <= 'F')
buf[i>>1] = (buf[i>>1] << 4) + (ch - 'A' + 10);
else
return 0;
}
for(i=0; i<3; i++) {
if (term->plt[buf[0]*3+i] != buf[i+1]) {
term->plt[buf[0]*3+i] = buf[i+1];
term->plt_local = term->plt_dirty = 1;
}
}
return 1;
}
static int
getparams(char *partial, int *params, int n)
{
char *next;
char *token = partial;
int i = 0;
if (!*partial) {
params[0] = 0;
return 1;
}
while (i < n && *token) {
params[i++] = strtol(token, &next, 10);
if (*next) next++;
token = next;
}
if (i < n && *(token-1) == ';')
params[i++] = 0;
return i;
}
#define SWITCH(T, F, V) (T)->mode = (V) ? (T)->mode | (F) : (T)->mode & ~(F)
static void
modeswitch(Term *term, int private, int number, int value)
{
if (private) {
/* DEC modes */
switch (number) {
case 1:
SWITCH(term, M_CURSORKEY, value);
break;
case 3:
/* TODO: 80/132 columns mode switch */
logfmt("NYI: DEC mode 3\n");
break;
case 5:
SWITCH(term, M_REVERSE, value);
break;
case 6:
SWITCH(term, M_ORIGIN, value);
term->row = term->top;
term->col = 0;
break;
case 7:
SWITCH(term, M_AUTOWRAP, value);
break;
case 8:
SWITCH(term, M_AUTORPT, value);
break;
case 9:
SWITCH(term, M_MOUSEX10, value);
break;
case 25:
SWITCH(term, M_CURSORVIS, value);
break;
case 1000:
SWITCH(term, M_MOUSEX11, value);
break;
default:
logfmt("UNS: DEC mode %d\n", number);
}
} else {
/* ANSI modes */
switch (number) {
case 3:
SWITCH(term, M_DISPCTRL, value);
break;
case 4:
SWITCH(term, M_INSERT, value);
break;
case 20:
SWITCH(term, M_NEWLINE, value);
break;
default:
logfmt("UNS: ANSI mode %d\n", number);
}
}
}
static int
fake_colour_16m(int red, int green, int blue)
{
int av = (red+green+blue)/3;
int palno = 1*(red>=av) + 2*(green>=av) + 4*(blue>=av);
if (red==green && green==blue) {
if (av > 212) palno = 15-8;
else if (av > 127) palno = 7-8;
else if (av > 42) palno = 8;
else palno = 0;
}
return palno + 8*(av>127);
}
static int
fake_colour_256(int colnum){
int nr, ng, nb;
if (colnum < 16) {
nr = (colnum&1) ? 170:0;
ng = (colnum&2) ? 170:0;
nb = (colnum&4) ? 170:0;
if (colnum&8) { nr += 85; ng += 85; nb += 85; }
if (colnum == 3) ng = 85;
} else if (colnum < 232) {
int i = colnum - 16;
nr = i / 36; ng = (i / 6) % 6; nb = i % 6;
nr = nr ? nr * 40 + 55 : 0;
ng = ng ? ng * 40 + 55 : 0;
nb = nb ? nb * 40 + 55 : 0;
} else if (colnum < 256) {
int i = colnum - 232;
nr = ng = nb = i * 10 + 8;
} else
nr=ng=nb = 127;
return fake_colour_16m(nr, ng, nb);
}
static void
sgr(Term *term, int n, int *params)
{
int i, number;
for(i=0; i<n; i++) {
number = params[i];
switch (number) {
case 0:
term->attr = def_attr;
term->pair = def_pair;
break;
case 1:
term->attr |= A_BOLD;
break;
case 2:
term->attr |= A_DIM;
break;
case 3:
term->attr |= A_ITALIC;
break;
case 4:
term->attr |= A_UNDERLINE;
break;
case 5:
term->attr |= A_BLINK;
break;
case 7:
term->attr |= A_INVERSE;
break;
case 8:
term->attr |= A_INVISIBLE;
break;
case 10:
/* TODO: reset toggle meta flag */
term->cs_array[term->cs_index = 0] = (term->mode&M_ISOLAT1)?CS_ISO:CS_BMP;
term->mode &= ~M_DISPCTRL;
break;
case 11:
/* TODO: reset toggle meta flag */
term->cs_array[term->cs_index] = CS_437;
term->mode |= M_DISPCTRL;
break;
case 12:
/* TODO: set toggle meta flag */
term->cs_array[term->cs_index] = CS_437;
term->mode |= M_DISPCTRL;
break;
case 21:
#ifndef OLDLINUX
term->attr |= A_UNDERLINE; /* Linux say should be: DOUBLE_ULINE */
break;
#endif
case 22:
term->attr &= ~A_DIM;
term->attr &= ~A_BOLD;
break;
case 23:
term->attr &= ~A_ITALIC;
break;
case 24:
term->attr &= ~A_UNDERLINE;
break;
case 25:
term->attr &= ~A_BLINK;
break;
case 27:
term->attr &= ~A_INVERSE;
break;
case 30: case 31: case 32: case 33: case 34: case 35: case 36: case 37:
term->pair = ((number - 30) << 4) | (term->pair & 0x0F);
break;
#ifdef OLDLINUX
case 38:
term->attr |= A_UNDERLINE;
term->pair = (DEF_FORE << 4) | (term->pair & 0x0F);
break;
case 39:
term->attr &= ~A_UNDERLINE;
term->pair = (DEF_FORE << 4) | (term->pair & 0x0F);
break;
#endif
#ifndef OLDLINUX
case 38:
i++ ;
if (i>n) break;
if (params[i] == 5) {
/* 256 colours */
term->pair = (fake_colour_256(params[i+1]) << 4) | (term->pair & 0x0F);
i++;
break;
} else if (params[i] == 2) {
/* 16M colours, note I'm using common form not strict ITU T.416 */
term->pair = (fake_colour_16m(params[i+1],params[i+2],params[i+3]) << 4) | (term->pair & 0x0F);
i+=3;
break;
}
/* Could be CMYK; probably broken */
i = n;
break;
case 39:
term->pair = (DEF_FORE << 4) | (term->pair & 0x0F);
break;
#endif
case 40: case 41: case 42: case 43: case 44: case 45: case 46: case 47:
term->pair = (term->pair & 0xF0) | (number - 40);
break;
#ifndef OLDLINUX
case 48:
i++ ;
if (i>n) break;
if (params[i] == 5) {
/* 256 colours */
term->pair = (term->pair & 0xF0) | fake_colour_256(params[i+1]);
i++;
break;
} else if (params[i] == 2) {
/* 16M colours, note I'm using common form not strict ITU T.416 */
term->pair = (term->pair & 0xF0) | fake_colour_16m(params[i+1],params[i+2],params[i+3]);
i+=3;
break;
}
/* Could be CMYK; probably broken */
i = n;
break;
#endif
case 49:
term->pair = (term->pair & 0xF0) | DEF_BACK;
break;
case 90: case 91: case 92: case 93: case 94: case 95: case 96: case 97:
term->pair = ((number - 90 + 8) << 4) | (term->pair & 0x0F);
break;
case 100: case 101: case 102: case 103: case 104: case 105: case 106: case 107:
term->pair = (term->pair & 0xF0) | (number - 100 + 8);
break;
default:
logfmt("UNS: SGR %d\n", number);
}
}
}
static void
ctrlseq(Term *term, uint8_t byte)
{
int private;
int n, k, k1;
int params[MAX_PARAMS];
char *str;
int ra, rb, ca, cb;
int i, j;
Cell cell;
if (!within_bounds(term, term->row, term->col))
return;
term->partial[term->parlen] = '\0';
if (*term->partial == '?') {
private = 1;
str = (char *) term->partial + 1;
} else {
private = 0;
str = (char *) term->partial;
}
n = getparams(str, params, MAX_PARAMS);
k = n ? *params : 0;
k1 = k ? k : 1;
switch (byte) {
case '@':
CLEARWRAP;
/* TODO: insert the indicated # of blank characters */
logfmt("NYI: Control Sequence @ (ICH)\n");
break;
case 'A':
CLEARWRAP;
term->row -= k1;
CLIPROW(0);
break;
case 'B': case 'e':
CLEARWRAP;
term->row += k1;
CLIPROW(term->rows-1);
break;
case 'C': case 'a':
CLEARWRAP;
term->col += k1;
CLIPCOL(term->cols-1);
break;
case 'D':
CLEARWRAP;
term->col -= k1;
CLIPCOL(0);
break;
case 'E':
term->row += k1;
term->col = 0;
CLIPROW(term->rows-1);
break;
case 'F':
term->row -= k1;
term->col = 0;
CLIPROW(0);
break;
case 'G': case '`':
term->col = k1 - 1;
CLIPCOL(term->cols-1);
break;
case 'H': case 'f':
if (n == 2) {
term->row = MAX(params[0], 1) - 1;
term->col = MAX(params[1], 1) - 1;
} else if (n == 1) {
term->row = MAX(params[0], 1) - 1;
term->col = 0;
} else {
term->row = term->col = 0;
}
if (term->mode & M_ORIGIN)
term->row += term->top;
CLIPROW(term->rows-1);
CLIPCOL(term->cols-1);
break;
case 'J':
CLEARWRAP;
ra = 0; rb = term->rows - 1;
ca = 0; cb = term->cols - 1;
if (k == 0) {
ra = term->row;
ca = term->col;
} else if (k == 1) {
rb = term->row;
cb = term->col;
}
for (j = ca; j < term->cols; j++)
term->addr[ra][j] = BLANK;
for (i = ra+1; i < rb; i++) {
for (j = 0; j < term->cols; j++) {
term->addr[i][j] = BLANK;
}
}
for (j = 0; j <= cb; j++)
term->addr[rb][j] = BLANK;
break;
case 'K':
CLEARWRAP;
ca = 0; cb = term->cols - 1;
if (k == 0)
ca = term->col;
else if (k == 1)
cb = term->col;
for (j = ca; j <= cb; j++)
term->addr[term->row][j] = BLANK;
break;
case 'L':
CLEARWRAP;
if (term->row < term->top || term->row > term->bot)
break;
/* This is implemented naively:
1. temporarily change the top margin to current row;
2. scroll up as many times as requested;
3. restore top margin to previous value. */
i = term->top;
term->top = term->row;
for (j = 0; j < k1; j++)
scroll_up(term);
term->top = i;
break;
case 'M':
CLEARWRAP;
if (term->row < term->top || term->row > term->bot)
break;
/* This is implemented naively:
1. temporarily change the top margin to current row;
2. scroll down as many times as requested;
3. restore top margin to previous value. */
/* TODO:
vt102-ug says:
"Lines added to bottom of screen have spaces with same character
attributes as last line moved up."
we need a more flexible scroll_down() to fix this. */
i = term->top;
term->top = term->row;
for (j = 0; j < k1; j++)
scroll_down(term);
term->top = i;
break;
case 'P':
CLEARWRAP;
cell = term->addr[term->row][term->cols-1];
cell.code = EMPTY;
for (j = term->col; j < term->cols-k1; j++)
term->addr[term->row][j] = term->addr[term->row][j+k1];
for (j = term->cols-k1; j < term->cols; j++)
term->addr[term->row][j] = cell;
break;
case 'X':
CLEARWRAP;
for (j = 0; j < k1; j++)
term->addr[term->row][term->col+j] = BLANK;
break;
case 'c':
/* Device Attributes (DA) */
/* if we were a real terminal, we'd reply with "ESC [ ? 6 c" */
/* since there is no application listening, we can ignore this */
break;
case 'd':
CLEARWRAP;
term->row = k1 - 1;
break;
case 'g':
/* TODO: clear tab stop */
logfmt("NYI: Control Sequence g (TBC)\n");
break;
case 'h':
for (i = 0; i < n; i++)
modeswitch(term, private, params[i], 1);
break;
case 'l':
for (i = 0; i < n; i++)
modeswitch(term, private, params[i], 0);
break;
case 'm':
sgr(term, n, params);
break;
case 'n':
/* Device Status Report (DSR) */
/* if we were a real terminal, we'd send a status reply (e.g. CPR) */
/* since there is no application listening, we can ignore this */
break;
case 'q':
/* TODO: set keyboard LEDs */
logfmt("NYI: Control Sequence q (DECLL)\n");
break;
case 'r':
if (n == 2) {
term->top = MAX(params[0], 1) - 1;
term->bot = MAX(params[1], 1) - 1;
} else {
term->top = 0;
term->bot = term->rows - 1;
}
term->row = term->mode & M_ORIGIN ? term->top : 0;
term->col = 0;
break;
case 's':
save_cursor(term);
break;
case 'u':
load_cursor(term);
break;
default:
logfmt("UNS: Control Sequence %c\n", byte);
}
}
#define CHARSET(T) ((T)->cs_array[(T)->cs_index])
#define PARCAT(T, B) ((T)->partial[(T)->parlen++] = (B))
#define RESET_STATE(T) do { (T)->state = S_ANY; (T)->parlen = 0; } while(0)
#define CHARLEN(B) ((B) < 0xE0 ? 2 : ((B) < 0xF0 ? 3 : 4))
void
parse(Term *term, uint8_t byte)
{
int es;
/* Bad suffix for a unicode sequence, dump it and interpret this byte normally. */
if (term->state == S_UNI && (byte < 0x80 || byte >= 0xC0)) {
addchar(term, 0xFFFD);
RESET_STATE(term);
}
if (byte != 0x1B && byte < 0x20 && !(term->mode & M_DISPCTRL)) {
ctrlchar(term, byte);
} else {