/* Determine a canonical name for the current locale's character encoding.
- Copyright (C) 2000 Free Software Foundation, Inc.
+ 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
# include <stdlib.h>
#endif
-#if HAVE_LANGINFO_CODESET
-# include <langinfo.h>
-#else
-# if HAVE_SETLOCALE
-# include <locale.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
-char *xmalloc ();
-char *xrealloc ();
+#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. */
/* 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' */
cp = charset_aliases;
if (cp == NULL)
{
+#ifndef WIN32
FILE *fp;
+ const char *dir = LIBDIR;
+ const char *base = "charset.alias";
+ char *file_name;
- fp = fopen (LIBDIR "/" "charset.alias", "r");
- if (fp == NULL)
- /* File not found, treat it as empty. */
+ /* 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
{
if (res_size == 0)
{
res_size = l1 + 1 + l2 + 1;
- res_ptr = xmalloc (res_size + 1);
+ res_ptr = malloc (res_size + 1);
}
else
{
res_size += l1 + 1 + l2 + 1;
- res_ptr = xrealloc (res_ptr, res_size + 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);
}
}
+ 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;
}
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 or NULL. */
+ name. */
#ifdef STATIC
STATIC
const char *codeset;
const char *aliases;
-#if HAVE_LANGINFO_CODESET
+#ifndef WIN32
+
+# if HAVE_LANGINFO_CODESET
/* Most systems support nl_langinfo (CODESET) nowadays. */
codeset = nl_langinfo (CODESET);
-#else
+# else
- /* On old systems which lack it, use setlocale and getenv. */
+ /* On old systems which lack it, use setlocale or getenv. */
const char *locale = NULL;
-# if HAVE_SETLOCALE
+ /* 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)
+# endif
+ if (locale == NULL || locale[0] == '\0')
{
locale = getenv ("LC_ALL");
- if (locale == NULL)
+ if (locale == NULL || locale[0] == '\0')
{
locale = getenv ("LC_CTYPE");
- if (locale == NULL)
+ if (locale == NULL || locale[0] == '\0')
locale = getenv ("LANG");
}
}
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)
- {
- /* Resolve alias. */
- for (aliases = get_charset_aliases ();
- *aliases != '\0';
- aliases += strlen (aliases) + 1, aliases += strlen (aliases) + 1)
- if (!strcmp (codeset, aliases))
- {
- codeset = aliases + strlen (aliases) + 1;
- break;
- }
- }
+ 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 / gnulib.git / blobdiff