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charset.c
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/* Seven Segment Optical Character Recognition Character Set Functions */
/* This program 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/* Copyright (C) 2018-2025 Erik Auerswald <auerswal@unix-ag.uni-kl.de> */
/* standard things */
#include <stdio.h> /* puts, printf, BUFSIZ, perror, FILE */
#include <stdlib.h> /* exit */
/* string manipulation */
#include <strings.h> /* strncasecmp */
/* my headers */
#include "defines.h" /* defines */
#include "help.h" /* character set keyword functions */
/* parse KEYWORD from --charset option */
charset_t parse_charset(char *keyword)
{
if(strncasecmp(keyword, "help", 4) == 0) {
print_cs_help();
exit(42);
} else if(strncasecmp(keyword, "full", 4) == 0) {
return CS_FULL;
} else if(strncasecmp(keyword, "digits", 6) == 0) {
return CS_DIGITS;
} else if(strncasecmp(keyword, "decimal", 7) == 0) {
return CS_DECIMAL;
} else if(strncasecmp(keyword, "hex", 3) == 0) {
return CS_HEXADECIMAL;
} else if(strncasecmp(keyword, "tt_robot", 8) == 0) {
return CS_TT_ROBOT;
} else {
return CS_PARSE_ERROR;
}
}
/* array for character set */
static char charset_array[CHARSET_MAX + 1];
/* initialize the character set array with the given character set */
void init_charset(charset_t cs)
{
int i;
for(i = 0; i < CHARSET_MAX + 1; i++) {
charset_array[i] = '_';
}
switch(cs) {
case CS_FULL:
charset_array[D_ZERO] = '0';
charset_array[D_ONE] = '1';
charset_array[D_TWO] = '2';
charset_array[D_THREE] = '3';
charset_array[D_FOUR] = '4';
charset_array[D_FIVE] = '5';
charset_array[D_SIX] = '6';
charset_array[D_SEVEN] = '7';
charset_array[D_ALTSEVEN] = '7';
charset_array[D_EIGHT] = '8';
charset_array[D_NINE] = '9';
charset_array[D_ALTNINE] = '9';
charset_array[D_DECIMAL] = '.';
charset_array[D_MINUS] = '-';
charset_array[D_HEX_A] = 'a';
charset_array[D_HEX_b] = 'b';
charset_array[D_HEX_C] = 'c';
charset_array[D_HEX_c] = 'c';
charset_array[D_HEX_d] = 'd';
charset_array[D_HEX_E] = 'e';
charset_array[D_HEX_F] = 'f';
charset_array[D_U] = 'u';
charset_array[D_T] = 't';
charset_array[D_L] = 'l';
charset_array[D_H] = 'h';
charset_array[D_h] = 'h';
charset_array[D_R] = 'r';
charset_array[D_ALT_R] = 'r';
charset_array[D_r] = 'r';
charset_array[D_P] = 'p';
charset_array[D_N] = 'n';
charset_array[D_n] = 'n';
charset_array[D_Y] = 'y';
charset_array[D_J] = 'j';
break;
case CS_DIGITS:
charset_array[D_ZERO] = '0';
charset_array[D_ONE] = '1';
charset_array[D_TWO] = '2';
charset_array[D_THREE] = '3';
charset_array[D_FOUR] = '4';
charset_array[D_FIVE] = '5';
charset_array[D_SIX] = '6';
charset_array[D_HEX_b] = '6';
charset_array[D_SEVEN] = '7';
charset_array[D_ALTSEVEN] = '7';
charset_array[D_EIGHT] = '8';
charset_array[D_NINE] = '9';
charset_array[D_ALTNINE] = '9';
break;
case CS_DECIMAL:
charset_array[D_ZERO] = '0';
charset_array[D_ONE] = '1';
charset_array[D_TWO] = '2';
charset_array[D_THREE] = '3';
charset_array[D_FOUR] = '4';
charset_array[D_FIVE] = '5';
charset_array[D_SIX] = '6';
charset_array[D_HEX_b] = '6';
charset_array[D_SEVEN] = '7';
charset_array[D_ALTSEVEN] = '7';
charset_array[D_EIGHT] = '8';
charset_array[D_NINE] = '9';
charset_array[D_ALTNINE] = '9';
charset_array[D_DECIMAL] = '.';
charset_array[D_MINUS] = '-';
break;
case CS_HEXADECIMAL:
charset_array[D_ZERO] = '0';
charset_array[D_ONE] = '1';
charset_array[D_TWO] = '2';
charset_array[D_THREE] = '3';
charset_array[D_FOUR] = '4';
charset_array[D_FIVE] = '5';
charset_array[D_SIX] = '6';
charset_array[D_SEVEN] = '7';
charset_array[D_ALTSEVEN] = '7';
charset_array[D_EIGHT] = '8';
charset_array[D_NINE] = '9';
charset_array[D_ALTNINE] = '9';
charset_array[D_DECIMAL] = '.';
charset_array[D_MINUS] = '-';
charset_array[D_HEX_A] = 'a';
charset_array[D_HEX_b] = 'b';
charset_array[D_HEX_C] = 'c';
charset_array[D_HEX_c] = 'c';
charset_array[D_HEX_d] = 'd';
charset_array[D_HEX_E] = 'e';
charset_array[D_HEX_F] = 'f';
break;
case CS_TT_ROBOT:
charset_array[D_ZERO] = '0';
charset_array[D_ONE] = '1';
charset_array[D_TWO] = '2';
charset_array[D_THREE] = '3';
charset_array[D_FOUR] = '4';
charset_array[D_FIVE] = '5';
charset_array[D_SIX] = '6';
charset_array[D_SEVEN] = '7';
charset_array[D_TT_WRONG_SEVEN_1] = '7';
charset_array[D_TT_WRONG_SEVEN_2] = '7';
charset_array[D_EIGHT] = '8';
charset_array[D_NINE] = '9';
charset_array[D_MINUS] = '-';
charset_array[D_HEX_A] = 'a';
charset_array[D_HEX_b] = 'b';
charset_array[D_HEX_C] = 'c';
charset_array[D_HEX_d] = 'd';
charset_array[D_U] = 'v';
charset_array[D_T] = 't';
charset_array[D_L] = 'l';
charset_array[D_H] = 'h';
charset_array[D_R] = 'r';
charset_array[D_P] = 'p';
charset_array[D_N] = 'n';
break;
default:
fprintf(stderr, "%s: error: charset %s is not implemented\n",
PROG, cs_key(cs));
exit(99);
break;
}
}
/* print a digit according to charset, return 1 if unknown, else 0 */
int print_digit(int digit, unsigned int flags)
{
int unknown_digit = 0;
char c = '_';
if(digit <= CHARSET_MAX) {
c = charset_array[digit];
}
if(c == '_') {
unknown_digit = 1;
}
if(!((c == '.') && (flags & OMIT_DECIMAL))) {
putchar(c);
}
return unknown_digit;
}