432 lines
9.7 KiB
C
432 lines
9.7 KiB
C
/*****************************************************************************
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*
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* $Id$
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* Purpose ...............: Characterset functions
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*
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*****************************************************************************
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* Copyright (C) 1997-2004
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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#include "../config.h"
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#include "mbselib.h"
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#define BUF_APPEND(d,s) str_append(d,sizeof(d),s)
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/*
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* Alias linked list
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*/
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static CharsetAlias *charset_alias_list = NULL;
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static CharsetAlias *charset_alias_last = NULL;
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/*
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* Table linked list
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*/
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static CharsetTable *charset_table_list = NULL;
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static CharsetTable *charset_table_last = NULL;
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/*
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* Current charset mapping table
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*/
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static CharsetTable *charset_table_used = NULL;
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/*
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* str_printf(): wrapper for sprintf()/snprintf()
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*/
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int str_printf(char *buf, size_t len, const char *fmt, ...)
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{
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va_list args;
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int n;
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va_start(args, fmt);
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n = vsprintf(buf, fmt, args);
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if (n >= len) {
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WriteError("Internal error - str_printf() buf overflow");
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/**NOT REACHED**/
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return FALSE;
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}
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/*
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* Make sure that buf[] is terminated with a \0. vsnprintf()
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* should do this automatically as required by the ANSI C99
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* proposal, but one never knows ... see also discussion on
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* BugTraq
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*/
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buf[len - 1] = 0;
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va_end(args);
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return n;
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}
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char *str_append(char *d, size_t n, char *s)
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{
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int max = n - strlen(d) - 1;
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strncat(d, s, max);
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d[n-1] = 0;
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return d;
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}
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char *str_copy(char *d, size_t n, char *s)
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{
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strncpy(d, s, n);
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d[n-1] = 0;
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return d;
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}
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#define BUF_COPY(d,s) str_copy (d,sizeof(d),s)
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char *getchrs(int val)
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{
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switch (val) {
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case FTNC_NONE: return (char *)"Undefined";
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case FTNC_CP437: return (char *)"CP437 2";
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case FTNC_CP850: return (char *)"CP850 2";
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case FTNC_CP865: return (char *)"CP865 2";
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case FTNC_CP866: return (char *)"CP866 2";
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case FTNC_CP852: return (char *)"CP852 2";
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case FTNC_CP895: return (char *)"CP895 2";
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case FTNC_LATIN_1: return (char *)"LATIN-1 2";
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case FTNC_LATIN_2: return (char *)"LATIN-2 2";
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case FTNC_LATIN_5: return (char *)"LATIN-5 2";
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case FTNC_MAC: return (char *)"MAC 2";
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case FTNC_KOI8_R: return (char *)"KOI8-R 2";
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default: return (char *)"LATIN-1 2";
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}
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}
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char *getchrsdesc(int val)
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{
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switch (val) {
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case FTNC_NONE: return (char *)"Undefined";
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case FTNC_CP437: return (char *)"IBM codepage 437 (Western European) (ANSI terminal)";
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case FTNC_CP850: return (char *)"IBM codepage 850 (Latin-1)";
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case FTNC_CP865: return (char *)"IBM codepage 865 (Nordic)";
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case FTNC_CP866: return (char *)"IBM codepage 866 (Russian)";
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case FTNC_CP852: return (char *)"IBM codepage 852 (Czech, Latin-1)";
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case FTNC_CP895: return (char *)"IBM codepage 895 (Czech, Kamenicky)";
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case FTNC_LATIN_1: return (char *)"ISO 8859-1 (Western European)";
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case FTNC_LATIN_2: return (char *)"ISO 8859-2 (Eastern European)";
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case FTNC_LATIN_5: return (char *)"ISO 8859-5 (Turkish)";
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case FTNC_MAC: return (char *)"MacIntosh character set";
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case FTNC_KOI8_R: return (char *)"Unix codepage KOI8-R (Russian)";
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default: return (char *)"ERROR";
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}
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}
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/*
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* Alloc new CharsetTable and put into linked list
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*/
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CharsetTable *charset_table_new(void)
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{
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CharsetTable *p;
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/* Alloc and clear */
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p = (CharsetTable *)xmalloc(sizeof(CharsetTable));
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memset(p, 0, sizeof(CharsetTable));
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p->next = NULL; /* Just to be sure */
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/* Put into linked list */
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if(charset_table_list)
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charset_table_last->next = p;
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else
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charset_table_list = p;
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charset_table_last = p;
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return p;
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}
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/*
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* Alloc new CharsetAlias and put into linked list
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*/
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CharsetAlias *charset_alias_new(void)
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{
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CharsetAlias *p;
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/* Alloc and clear */
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p = (CharsetAlias *)xmalloc(sizeof(CharsetAlias));
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memset(p, 0, sizeof(CharsetAlias));
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p->next = NULL; /* Just to be sure */
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/* Put into linked list */
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if(charset_alias_list)
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charset_alias_last->next = p;
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else
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charset_alias_list = p;
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charset_alias_last = p;
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return p;
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}
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/*
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* Write binary mapping file
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*/
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int charset_write_bin(char *name)
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{
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FILE *fp;
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CharsetTable *pt;
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CharsetAlias *pa;
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fp = fopen(name, "w+");
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if (!fp)
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return FALSE;
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/*
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* Write aliases
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*/
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for (pa = charset_alias_list; pa; pa=pa->next) {
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fputc(CHARSET_FILE_ALIAS, fp);
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fwrite(pa, sizeof(CharsetAlias), 1, fp);
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if (ferror(fp)) {
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fclose(fp);
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return FALSE;
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}
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}
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/*
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* Write tables
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*/
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for(pt = charset_table_list; pt; pt=pt->next) {
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fputc(CHARSET_FILE_TABLE, fp);
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fwrite(pt, sizeof(CharsetTable), 1, fp);
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if (ferror(fp)) {
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fclose(fp);
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return FALSE;
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}
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}
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fclose(fp);
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return TRUE;
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}
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/*
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* Read binary mapping file
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*/
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int charset_read_bin(void)
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{
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FILE *fp;
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int c, n;
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CharsetTable *pt;
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CharsetAlias *pa;
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char *name;
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name = calloc(PATH_MAX, sizeof(char));
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sprintf(name, "%s/etc/charset.bin", getenv("MBSE_ROOT"));
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Syslog('s', "Reading %s", name);
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if ((fp = fopen(name, "r")) == NULL) {
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WriteError("$Can't open %s", name);
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free(name);
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return FALSE;
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}
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free(name);
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while ((c = fgetc(fp)) != EOF) {
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switch(c) {
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case CHARSET_FILE_ALIAS: pa = charset_alias_new();
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n = fread((void *)pa, sizeof(CharsetAlias), 1, fp);
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pa->next = NULL; /* overwritten by fread() */
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if (n != 1)
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return FALSE;
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Syslog('s', "read charset alias: %s -> %s", pa->alias, pa->name);
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break;
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case CHARSET_FILE_TABLE: pt = charset_table_new();
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n = fread((void *)pt, sizeof(CharsetTable), 1, fp);
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pt->next = NULL; /* overwritten by fread() */
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if (n != 1)
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return FALSE;
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Syslog('s', "read charset table: %s -> %s", pt->in, pt->out);
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break;
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default: return FALSE;
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break;
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}
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}
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if(ferror(fp))
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return FALSE;
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fclose(fp);
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return TRUE;
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}
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/*
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* Convert to MIME quoted-printable =XX if qp==TRUE
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*/
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char *charset_qpen(int c, int qp)
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{
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static char buf[4];
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c &= 0xff;
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if (qp && (c == '=' || c >= 0x80))
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str_printf(buf, sizeof(buf), "=%02.2X", c & 0xff);
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else {
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buf[0] = c;
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buf[1] = 0;
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}
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return buf;
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}
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/*
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* Map single character
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*/
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char *charset_map_c(int c, int qp)
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{
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static char buf[MAX_CHARSET_OUT * 4];
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char *s;
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c &= 0xff;
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buf[0] = 0;
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if (charset_table_used && c>=0x80) {
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s = charset_table_used->map[c - 0x80];
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while(*s)
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BUF_APPEND(buf, charset_qpen(*s++, qp));
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} else {
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BUF_COPY(buf, charset_qpen(c, qp));
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}
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return buf;
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}
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/*
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* Search alias
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*/
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char *charset_alias_fsc(char *name)
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{
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CharsetAlias *pa;
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/*
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* Search for aliases
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*/
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for (pa = charset_alias_list; pa; pa=pa->next) {
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if (strcasecmp(pa->name, name) == 0)
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return pa->alias;
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}
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return name;
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}
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char *charset_alias_rfc(char *name)
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{
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CharsetAlias *pa;
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/*
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* Search for aliases
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*/
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for (pa = charset_alias_list; pa; pa=pa->next) {
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if (strcasecmp(pa->alias, name) == 0)
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return pa->name;
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}
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return name;
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}
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/*
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* Set character mapping table
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*/
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int charset_set_in_out(char *in, char *out)
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{
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CharsetTable *pt;
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CharsetAlias *pa;
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int i;
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if (!in || !out)
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return FALSE;
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/*
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* Check if charset.bin is loaded.
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*/
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if ((charset_alias_list == NULL) || (charset_table_list == NULL))
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charset_read_bin();
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Syslog('s', "charset1: in=%s out=%s", in, out);
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/*
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* For charset names with a space (level number), shorten the name.
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*/
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for (i = 0; i < strlen(in); i++)
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if (in[i] == ' ') {
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in[i] = '\0';
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break;
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}
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for (i = 0; i < strlen(out); i++)
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if (out[i] == ' ') {
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out[i] = '\0';
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break;
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}
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Syslog('s', "charset2: in=%s out=%s", in, out);
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/* Search for aliases */
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for (pa = charset_alias_list; pa; pa=pa->next) {
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if (strcasecmp(pa->alias, in) == 0)
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in = pa->name;
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if (strcasecmp(pa->alias, out) == 0)
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out = pa->name;
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}
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Syslog('s', "charset3: in=%s out=%s", in, out);
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/* Search for matching table */
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for (pt = charset_table_list; pt; pt=pt->next) {
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if ((strcasecmp(pt->in, in) == 0) && (strcasecmp(pt->out, out) == 0)) {
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Syslog('s', "charset: table found in=%s out=%s", pt->in, pt->out);
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charset_table_used = pt;
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return TRUE;
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}
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}
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Syslog('b', "charset: no table found in=%s out=%s", in, out);
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charset_table_used = NULL;
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return FALSE;
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}
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