+++ /dev/null
-/* 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
-
-#if HAVE_STDDEF_H
-# include <stddef.h>
-#endif
-
-#include <stdio.h>
-#if HAVE_STRING_H
-# include <string.h>
-#else
-# include <strings.h>
-#endif
-#if HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
-
-#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 ()
-{
- 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, "r")) == 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 = malloc (res_size + 1);
- }
- else
- {
- res_size += l1 + 1 + l2 + 1;
- res_ptr = 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. */
-
-#ifdef STATIC
-STATIC
-#endif
-const char *
-locale_charset ()
-{
- 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;
-}
projects / runtime.git / blobdiff