(locale_charset): Add support for Win32.

[gnulib.git] / lib / localcharset.c

diff --git a/lib/localcharset.c b/lib/localcharset.c
index e80a2c5..936d93d 100644 (file)
--- a/lib/localcharset.c
+++ b/lib/localcharset.c
@@ -37,18 +37,31 @@
 # 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
 
-#include "path-concat.h"
+#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
@@ -70,8 +83,26 @@ get_charset_aliases ()
   cp = charset_aliases;
   if (cp == NULL)
     {
+#ifndef WIN32
       FILE *fp;
-      char *file_name = path_concat (LIBDIR, "charset.alias", NULL);
+      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.  */
@@ -111,12 +142,18 @@ get_charset_aliases ()
              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);
@@ -131,9 +168,20 @@ get_charset_aliases ()
            }
        }
 
-      charset_aliases = cp;
       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;
@@ -154,26 +202,28 @@ locale_charset ()
   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.  */
   const char *locale = NULL;
 
-# if HAVE_SETLOCALE
+#  if HAVE_SETLOCALE
   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");
        }
     }
@@ -183,9 +233,19 @@ locale_charset ()
      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)
+  if (codeset != NULL && codeset[0] != '\0')
     {
       /* Resolve alias. */
       for (aliases = get_charset_aliases ();