/*****************************************************************************
*
* $Id$
* Purpose ...............: Characterset functions
*
*****************************************************************************
* Copyright (C) 1997-2004
*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS 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, or (at your option) any
* later version.
*
* MBSE BBS 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 MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*****************************************************************************/
#include "../config.h"
#include "mbselib.h"
#define BUF_APPEND(d,s) str_append(d,sizeof(d),s)
/*
* Alias linked list
*/
static CharsetAlias *charset_alias_list = NULL;
static CharsetAlias *charset_alias_last = NULL;
/*
* Table linked list
*/
static CharsetTable *charset_table_list = NULL;
static CharsetTable *charset_table_last = NULL;
/*
* Current charset mapping table
*/
static CharsetTable *charset_table_used = NULL;
/*
* str_printf(): wrapper for sprintf()/snprintf()
*/
int str_printf(char *buf, size_t len, const char *fmt, ...)
{
va_list args;
int n;
va_start(args, fmt);
n = vsprintf(buf, fmt, args);
if (n >= len) {
WriteError("Internal error - str_printf() buf overflow");
/**NOT REACHED**/
return FALSE;
}
/*
* Make sure that buf[] is terminated with a \0. vsnprintf()
* should do this automatically as required by the ANSI C99
* proposal, but one never knows ... see also discussion on
* BugTraq
*/
buf[len - 1] = 0;
va_end(args);
return n;
}
char *str_append(char *d, size_t n, char *s)
{
int max = n - strlen(d) - 1;
strncat(d, s, max);
d[n-1] = 0;
return d;
}
char *str_copy(char *d, size_t n, char *s)
{
strncpy(d, s, n);
d[n-1] = 0;
return d;
}
#define BUF_COPY(d,s) str_copy (d,sizeof(d),s)
char *getchrs(int val)
{
switch (val) {
case FTNC_NONE: return (char *)"Undefined";
case FTNC_CP437: return (char *)"CP437 2";
case FTNC_CP850: return (char *)"CP850 2";
case FTNC_CP865: return (char *)"CP865 2";
case FTNC_CP866: return (char *)"CP866 2";
case FTNC_CP852: return (char *)"CP852 2";
case FTNC_CP895: return (char *)"CP895 2";
case FTNC_LATIN_1: return (char *)"LATIN-1 2";
case FTNC_LATIN_2: return (char *)"LATIN-2 2";
case FTNC_LATIN_5: return (char *)"LATIN-5 2";
case FTNC_MAC: return (char *)"MAC 2";
case FTNC_KOI8_R: return (char *)"KOI8-R 2";
case FTNC_CP936: return (char *)"CP936 2";
default: return (char *)"LATIN-1 2";
}
}
/*
* Experimental table that should translate from the user selected
* charset to a locale. This is not the right way to do, the best
* thing is to store each bbs users locale instead and then lookup
* his characterset using standard library calls.
*
* This is one of the things the bbs world never saw coming, in the
* "good" old days bbses were almost allways called local. Thanks
* to the internet bbs users are now all over the world.
*/
char *getlocale(int val)
{
switch (val) {
case FTNC_NONE: return (char *)"C";
case FTNC_CP437: return (char *)"en_US";
case FTNC_CP850: return (char *)"en_US";
case FTNC_CP865: return (char *)"sv_SE";
case FTNC_CP866: return (char *)"ru_RU";
case FTNC_CP852: return (char *)"cs_CZ";
case FTNC_CP895: return (char *)"cs_CZ";
case FTNC_LATIN_1: return (char *)"en_US";
case FTNC_LATIN_2: return (char *)"cs_CZ";
case FTNC_MAC: return (char *)"en_US";
case FTNC_KOI8_R: return (char *)"ru_RU.koi8r";
case FTNC_CP936: return (char *)"zh_CN.gbk";
default: return (char *)"C";
}
}
char *getchrsdesc(int val)
{
switch (val) {
case FTNC_NONE: return (char *)"Undefined";
case FTNC_CP437: return (char *)"IBM codepage 437 (Western European) (ANSI terminal)";
case FTNC_CP850: return (char *)"IBM codepage 850 (Latin-1)";
case FTNC_CP865: return (char *)"IBM codepage 865 (Nordic)";
case FTNC_CP866: return (char *)"IBM codepage 866 (Russian)";
case FTNC_CP852: return (char *)"IBM codepage 852 (Czech, Latin-1)";
case FTNC_CP895: return (char *)"IBM codepage 895 (Czech, Kamenicky)";
case FTNC_LATIN_1: return (char *)"ISO 8859-1 (Western European)";
case FTNC_LATIN_2: return (char *)"ISO 8859-2 (Eastern European)";
case FTNC_LATIN_5: return (char *)"ISO 8859-5 (Turkish)";
case FTNC_MAC: return (char *)"MacIntosh character set";
case FTNC_KOI8_R: return (char *)"Unix codepage KOI8-R (Russian)";
case FTNC_CP936: return (char *)"IBM codepage 936 (Chinese, GBK)";
default: return (char *)"ERROR";
}
}
/*
* Alloc new CharsetTable and put into linked list
*/
CharsetTable *charset_table_new(void)
{
CharsetTable *p;
/* Alloc and clear */
p = (CharsetTable *)xmalloc(sizeof(CharsetTable));
memset(p, 0, sizeof(CharsetTable));
p->next = NULL; /* Just to be sure */
/* Put into linked list */
if(charset_table_list)
charset_table_last->next = p;
else
charset_table_list = p;
charset_table_last = p;
return p;
}
/*
* Alloc new CharsetAlias and put into linked list
*/
CharsetAlias *charset_alias_new(void)
{
CharsetAlias *p;
/* Alloc and clear */
p = (CharsetAlias *)xmalloc(sizeof(CharsetAlias));
memset(p, 0, sizeof(CharsetAlias));
p->next = NULL; /* Just to be sure */
/* Put into linked list */
if(charset_alias_list)
charset_alias_last->next = p;
else
charset_alias_list = p;
charset_alias_last = p;
return p;
}
/*
* Write binary mapping file
*/
int charset_write_bin(char *name)
{
FILE *fp;
CharsetTable *pt;
CharsetAlias *pa;
fp = fopen(name, "w+");
if (!fp)
return FALSE;
/*
* Write aliases
*/
for (pa = charset_alias_list; pa; pa=pa->next) {
fputc(CHARSET_FILE_ALIAS, fp);
fwrite(pa, sizeof(CharsetAlias), 1, fp);
if (ferror(fp)) {
fclose(fp);
return FALSE;
}
}
/*
* Write tables
*/
for(pt = charset_table_list; pt; pt=pt->next) {
fputc(CHARSET_FILE_TABLE, fp);
fwrite(pt, sizeof(CharsetTable), 1, fp);
if (ferror(fp)) {
fclose(fp);
return FALSE;
}
}
fclose(fp);
return TRUE;
}
/*
* Read binary mapping file
*/
int charset_read_bin(void)
{
FILE *fp;
int c, n;
CharsetTable *pt;
CharsetAlias *pa;
char *name;
name = calloc(PATH_MAX, sizeof(char));
sprintf(name, "%s/etc/charset.bin", getenv("MBSE_ROOT"));
Syslog('s', "Reading %s", name);
if ((fp = fopen(name, "r")) == NULL) {
WriteError("$Can't open %s", name);
free(name);
return FALSE;
}
free(name);
while ((c = fgetc(fp)) != EOF) {
switch(c) {
case CHARSET_FILE_ALIAS: pa = charset_alias_new();
n = fread((void *)pa, sizeof(CharsetAlias), 1, fp);
pa->next = NULL; /* overwritten by fread() */
if (n != 1)
return FALSE;
Syslog('s', "read charset alias: %s -> %s", pa->alias, pa->name);
break;
case CHARSET_FILE_TABLE: pt = charset_table_new();
n = fread((void *)pt, sizeof(CharsetTable), 1, fp);
pt->next = NULL; /* overwritten by fread() */
if (n != 1)
return FALSE;
Syslog('s', "read charset table: %s -> %s", pt->in, pt->out);
break;
default: return FALSE;
break;
}
}
if(ferror(fp))
return FALSE;
fclose(fp);
return TRUE;
}
/*
* Convert to MIME quoted-printable =XX if qp==TRUE
*/
char *charset_qpen(int c, int qp)
{
static char buf[4];
c &= 0xff;
if (qp && (c == '=' || c >= 0x80))
str_printf(buf, sizeof(buf), "=%02.2X", c & 0xff);
else {
buf[0] = c;
buf[1] = 0;
}
return buf;
}
/*
* Map single character
*/
char *charset_map_c(int c, int qp)
{
static char buf[MAX_CHARSET_OUT * 4];
char *s;
c &= 0xff;
buf[0] = 0;
if (charset_table_used && c>=0x80) {
s = charset_table_used->map[c - 0x80];
while(*s)
BUF_APPEND(buf, charset_qpen(*s++, qp));
} else {
BUF_COPY(buf, charset_qpen(c, qp));
}
return buf;
}
/*
* Search alias
*/
char *charset_alias_fsc(char *name)
{
CharsetAlias *pa;
/*
* Search for aliases
*/
for (pa = charset_alias_list; pa; pa=pa->next) {
if (strcasecmp(pa->name, name) == 0)
return pa->alias;
}
return name;
}
char *charset_alias_rfc(char *name)
{
CharsetAlias *pa;
/*
* Search for aliases
*/
for (pa = charset_alias_list; pa; pa=pa->next) {
if (strcasecmp(pa->alias, name) == 0)
return pa->name;
}
return name;
}
/*
* Set character mapping table
*/
int charset_set_in_out(char *in, char *out)
{
CharsetTable *pt;
CharsetAlias *pa;
int i;
if (!in || !out)
return FALSE;
/*
* Check if charset.bin is loaded.
*/
if ((charset_alias_list == NULL) || (charset_table_list == NULL))
charset_read_bin();
Syslog('s', "charset1: in=%s out=%s", in, out);
/*
* For charset names with a space (level number), shorten the name.
*/
for (i = 0; i < strlen(in); i++)
if (in[i] == ' ') {
in[i] = '\0';
break;
}
for (i = 0; i < strlen(out); i++)
if (out[i] == ' ') {
out[i] = '\0';
break;
}
Syslog('s', "charset2: in=%s out=%s", in, out);
/* Search for aliases */
for (pa = charset_alias_list; pa; pa=pa->next) {
if (strcasecmp(pa->alias, in) == 0)
in = pa->name;
if (strcasecmp(pa->alias, out) == 0)
out = pa->name;
}
Syslog('s', "charset3: in=%s out=%s", in, out);
/* Search for matching table */
for (pt = charset_table_list; pt; pt=pt->next) {
if ((strcasecmp(pt->in, in) == 0) && (strcasecmp(pt->out, out) == 0)) {
Syslog('s', "charset: table found in=%s out=%s", pt->in, pt->out);
charset_table_used = pt;
return TRUE;
}
}
Syslog('b', "charset: no table found in=%s out=%s", in, out);
charset_table_used = NULL;
return FALSE;
}