mc/src/charsets.c

255 lines
5.1 KiB
C
Raw Normal View History

/* Text conversion from one charset to another.
Copyright (C) 2001 Walery Studennikov <despair@sama.ru>
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 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <config.h>
#ifdef HAVE_CHARSET
2005-02-08 12:04:03 +03:00
#include <stdio.h>
2005-02-08 12:04:03 +03:00
#include <stdlib.h>
#include <string.h>
2005-02-08 12:04:03 +03:00
#include <iconv.h>
#include <mhl/string.h>
#include "global.h"
#include "charsets.h"
int n_codepages = 0;
struct codepage_desc *codepages;
unsigned char conv_displ[256];
unsigned char conv_input[256];
int
load_codepages_list (void)
{
int result = -1;
FILE *f;
char *fname;
char buf[256];
extern char *mc_home;
extern int display_codepage;
char *default_codepage = NULL;
fname = mhl_str_dir_plus_file (mc_home, CHARSETS_INDEX);
if (!(f = fopen (fname, "r"))) {
fprintf (stderr, _("Warning: file %s not found\n"), fname);
g_free (fname);
return -1;
}
g_free (fname);
for (n_codepages = 0; fgets (buf, sizeof (buf), f);)
if (buf[0] != '\n' && buf[0] != '\0' && buf[0] != '#')
++n_codepages;
rewind (f);
codepages = g_new0 (struct codepage_desc, n_codepages + 1);
for (n_codepages = 0; fgets (buf, sizeof buf, f);) {
/* split string into id and cpname */
char *p = buf;
int buflen = strlen (buf);
if (*p == '\n' || *p == '\0' || *p == '#')
continue;
if (buflen > 0 && buf[buflen - 1] == '\n')
buf[buflen - 1] = '\0';
while (*p != '\t' && *p != ' ' && *p != '\0')
++p;
if (*p == '\0')
goto fail;
*p++ = 0;
while (*p == '\t' || *p == ' ')
++p;
if (*p == '\0')
goto fail;
if (strcmp (buf, "default") == 0) {
default_codepage = g_strdup (p);
continue;
}
codepages[n_codepages].id = g_strdup (buf);
codepages[n_codepages].name = g_strdup (p);
++n_codepages;
}
if (default_codepage) {
display_codepage = get_codepage_index (default_codepage);
g_free (default_codepage);
}
result = n_codepages;
fail:
fclose (f);
return result;
}
void
free_codepages_list (void)
{
if (n_codepages > 0) {
int i;
for (i = 0; i < n_codepages; i++) {
g_free (codepages[i].id);
g_free (codepages[i].name);
}
n_codepages = 0;
g_free (codepages);
codepages = 0;
}
}
#define OTHER_8BIT "Other_8_bit"
const char *
get_codepage_id (int n)
{
return (n < 0) ? OTHER_8BIT : codepages[n].id;
}
int
get_codepage_index (const char *id)
{
int i;
if (strcmp (id, OTHER_8BIT) == 0)
return -1;
for (i = 0; codepages[i].id; ++i)
if (strcmp (id, codepages[i].id) == 0)
return i;
return -1;
}
static char
translate_character (iconv_t cd, char c)
{
char outbuf[4], *obuf;
size_t ibuflen, obuflen, count;
ICONV_CONST char *ibuf = &c;
obuf = outbuf;
ibuflen = 1;
obuflen = 4;
count = iconv (cd, &ibuf, &ibuflen, &obuf, &obuflen);
if (count != ((size_t) -1) && ibuflen == 0)
return outbuf[0];
return UNKNCHAR;
}
char errbuf[255];
/*
* FIXME: This assumes that ASCII is always the first encoding
* in mc.charsets
*/
#define CP_ASCII 0
const char *
init_translation_table (int cpsource, int cpdisplay)
{
int i;
iconv_t cd;
const char *cpsour, *cpdisp;
/* Fill inpit <-> display tables */
if (cpsource < 0 || cpdisplay < 0 || cpsource == cpdisplay) {
for (i = 0; i <= 255; ++i) {
conv_displ[i] = i;
conv_input[i] = i;
}
return NULL;
}
for (i = 0; i <= 127; ++i) {
conv_displ[i] = i;
conv_input[i] = i;
}
cpsour = codepages[cpsource].id;
cpdisp = codepages[cpdisplay].id;
/* display <- inpit table */
cd = iconv_open (cpdisp, cpsour);
if (cd == (iconv_t) - 1) {
2009-02-01 22:03:28 +03:00
snprintf (errbuf, sizeof (errbuf),
_("Cannot translate from %s to %s"), cpsour, cpdisp);
return errbuf;
}
for (i = 128; i <= 255; ++i)
conv_displ[i] = translate_character (cd, i);
iconv_close (cd);
/* inpit <- display table */
cd = iconv_open (cpsour, cpdisp);
if (cd == (iconv_t) - 1) {
2009-02-01 22:03:28 +03:00
snprintf (errbuf, sizeof (errbuf),
_("Cannot translate from %s to %s"), cpdisp, cpsour);
return errbuf;
}
for (i = 128; i <= 255; ++i) {
unsigned char ch;
ch = translate_character (cd, i);
conv_input[i] = (ch == UNKNCHAR) ? i : ch;
}
iconv_close (cd);
return NULL;
}
void
convert_to_display (char *str)
{
if (!str)
return;
while (*str) {
*str = conv_displ[(unsigned char) *str];
str++;
}
}
void
convert_from_input (char *str)
{
if (!str)
return;
while (*str) {
*str = conv_input[(unsigned char) *str];
str++;
}
}
#endif /* HAVE_CHARSET */