gtk2/gdk/x11/gdkim-x11.c

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "config.h"

#include "gdkx.h"
#include "gdkmain.h"
#include "gdkinternals.h"
#include "gdkdisplay-x11.h"

#include <locale.h>
#include <stdlib.h>
#include <string.h>


/* If this variable is FALSE, it indicates that we should
 * avoid trying to use multibyte conversion functions and
 * assume everything is 1-byte per character
 */
static gboolean gdk_use_mb;

void
_gdk_x11_initialize_locale (void)
{
  wchar_t result;
  gchar *current_locale;
  static char *last_locale = NULL;

  gdk_use_mb = FALSE;

  current_locale = setlocale (LC_ALL, NULL);

  if (last_locale && strcmp (last_locale, current_locale) == 0)
    return;

  g_free (last_locale);
  last_locale = g_strdup (current_locale);

  if (XSupportsLocale ())
    XSetLocaleModifiers ("");

  if ((strcmp (current_locale, "C")) && (strcmp (current_locale, "POSIX")))
    {
      gdk_use_mb = TRUE;

#ifndef X_LOCALE
      /* Detect ancient GNU libc, where mb == UTF8. Not useful unless it's
       * really a UTF8 locale. The below still probably will
       * screw up on Greek, Cyrillic, etc, encoded as UTF8.
       */
      
      if ((MB_CUR_MAX == 2) &&
	  (mbstowcs (&result, "\xdd\xa5", 1) > 0) &&
	  result == 0x765)
	{
	  if ((strlen (current_locale) < 4) ||
	      g_ascii_strcasecmp (current_locale + strlen(current_locale) - 4,
				  "utf8"))
	    gdk_use_mb = FALSE;
	}
#endif /* X_LOCALE */
    }

  GDK_NOTE (XIM,
	    g_message ("%s multi-byte string functions.", 
		       gdk_use_mb ? "Using" : "Not using"));
  
  return;
}

gchar*
gdk_set_locale (void)
{
  if (!setlocale (LC_ALL,""))
    g_warning ("locale not supported by C library");

  _gdk_x11_initialize_locale ();
  
  return setlocale (LC_ALL, NULL);
}