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elinks/src/intl/gettext/localcharset.c
Witold Filipczyk 311909f49a [gettext] cast
2022-01-17 16:25:05 +01:00

260 lines
6.6 KiB
C

/* Determine a canonical name for the current locale's character encoding.
Copyright (C) 2000-2001 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published
by the Free Software Foundation; either version 2, 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA. */
/* Written by Bruno Haible <haible@clisp.cons.org>. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#if defined _WIN32 || defined __WIN32__
#undef WIN32 /* avoid warning on mingw32 */
#define WIN32
#endif
#ifndef WIN32
#if HAVE_LANGINFO_CODESET
#include <langinfo.h>
#else
#if HAVE_SETLOCALE
#include <locale.h>
#endif
#endif
#else /* WIN32 */
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
#ifndef DIRECTORY_SEPARATOR
#define DIRECTORY_SEPARATOR '/'
#endif
#ifndef ISSLASH
#define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR)
#endif
/* The following static variable is declared 'volatile' to avoid a
possible multithread problem in the function get_charset_aliases. If we
are running in a threaded environment, and if two threads initialize
'charset_aliases' simultaneously, both will produce the same value,
and everything will be ok if the two assignments to 'charset_aliases'
are atomic. But I don't know what will happen if the two assignments mix. */
#if __STDC__ != 1
#define volatile /* empty */
#endif
/* Pointer to the contents of the charset.alias file, if it has already been
read, else NULL. Its format is:
ALIAS_1 '\0' CANONICAL_1 '\0' ... ALIAS_n '\0' CANONICAL_n '\0' '\0' */
static const char *volatile charset_aliases;
/* Return a pointer to the contents of the charset.alias file. */
static const char *
get_charset_aliases(void)
{
const char *cp;
cp = charset_aliases;
if (cp == NULL) {
#ifndef WIN32
FILE *fp;
const char *dir = LIBDIR;
const char *base = "charset.alias";
char *file_name;
/* Concatenate dir and base into freshly allocated file_name. */
{
size_t dir_len = strlen(dir);
size_t base_len = strlen(base);
int add_slash = (dir_len > 0
&& !ISSLASH(dir[dir_len - 1]));
file_name =
(char *)malloc(dir_len + add_slash + base_len +
1);
if (file_name != NULL) {
memcpy(file_name, dir, dir_len);
if (add_slash)
file_name[dir_len] =
DIRECTORY_SEPARATOR;
memcpy(file_name + dir_len + add_slash, base,
base_len + 1);
}
}
if (file_name == NULL || (fp = fopen(file_name, "rb")) == NULL)
/* Out of memory or file not found, treat it as empty. */
cp = "";
else {
/* Parse the file's contents. */
int c;
char buf1[50 + 1];
char buf2[50 + 1];
char *res_ptr = NULL;
size_t res_size = 0;
size_t l1, l2;
for (;;) {
c = getc(fp);
if (c == EOF)
break;
if (c == '\n' || c == ' ' || c == '\t')
continue;
if (c == '#') {
/* Skip comment, to end of line. */
do
c = getc(fp);
while (!(c == EOF || c == '\n'));
if (c == EOF)
break;
continue;
}
ungetc(c, fp);
if (fscanf(fp, "%50s %50s", buf1, buf2) < 2)
break;
l1 = strlen(buf1);
l2 = strlen(buf2);
if (res_size == 0) {
res_size = l1 + 1 + l2 + 1;
res_ptr = (char *)malloc(res_size + 1);
} else {
res_size += l1 + 1 + l2 + 1;
res_ptr =
(char *)realloc(res_ptr, res_size + 1);
}
if (res_ptr == NULL) {
/* Out of memory. */
res_size = 0;
break;
}
strcpy(res_ptr + res_size - (l2 + 1) - (l1 + 1),
buf1);
strcpy(res_ptr + res_size - (l2 + 1), buf2);
}
fclose(fp);
if (res_size == 0)
cp = "";
else {
*(res_ptr + res_size) = '\0';
cp = res_ptr;
}
}
if (file_name != NULL)
free(file_name);
#else /* WIN32 */
/* To avoid the troubles of installing a separate file in the same
directory as the DLL and of retrieving the DLL's directory at
runtime, simply inline the aliases here. */
cp = "CP936" "\0" "GBK" "\0" "CP1361" "\0" "JOHAB" "\0";
#endif
charset_aliases = cp;
}
return cp;
}
/* Determine the current locale's character encoding, and canonicalize it
into one of the canonical names listed in config.charset.
The result must not be freed; it is statically allocated.
If the canonical name cannot be determined, the result is a non-canonical
name. */
/* Should be in .h file, used in _nl_init_domain_conv() function. */
const char *elinks_locale_charset(void);
#ifdef STATIC
STATIC
#endif
const char *
elinks_locale_charset(void)
{
const char *codeset;
const char *aliases;
#ifndef WIN32
#if HAVE_LANGINFO_CODESET
/* Most systems support nl_langinfo (CODESET) nowadays. */
codeset = nl_langinfo(CODESET);
#else
/* On old systems which lack it, use setlocale or getenv. */
const char *locale = NULL;
/* But most old systems don't have a complete set of locales. Some
(like SunOS 4 or DJGPP) have only the C locale. Therefore we don't
use setlocale here; it would return "C" when it doesn't support the
locale name the user has set. */
#if HAVE_SETLOCALE && 0
locale = setlocale(LC_CTYPE, NULL);
#endif
if (locale == NULL || locale[0] == '\0') {
locale = getenv("LC_ALL");
if (locale == NULL || locale[0] == '\0') {
locale = getenv("LC_CTYPE");
if (locale == NULL || locale[0] == '\0')
locale = getenv("LANG");
}
}
/* On some old systems, one used to set locale = "iso8859_1". On others,
you set it to "language_COUNTRY.charset". In any case, we resolve it
through the charset.alias file. */
codeset = locale;
#endif
#else /* WIN32 */
static char buf[2 + 10 + 1];
/* Win32 has a function returning the locale's codepage as a number. */
sprintf(buf, "CP%u", GetACP());
codeset = buf;
#endif
if (codeset == NULL)
/* The canonical name cannot be determined. */
codeset = "";
/* Resolve alias. */
for (aliases = get_charset_aliases();
*aliases != '\0';
aliases += strlen(aliases) + 1, aliases += strlen(aliases) + 1)
if (strcmp(codeset, aliases) == 0
|| (aliases[0] == '*' && aliases[1] == '\0')) {
codeset = aliases + strlen(aliases) + 1;
break;
}
return codeset;
}