/* 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 <locale.h>

#include <stdlib.h>

#include <string.h>

#include "gdkx.h"

#include "gdk.h"		/* For gdk_flush() */

#include "gdkpixmap.h"

#include "gdkinternals.h"

#include "gdkdisplay-x11.h"

#include "gdkalias.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);

}

static GdkDisplay *

find_a_display (void)

{

  GdkDisplay *display = gdk_display_get_default ();

  if (!display)

    display = _gdk_displays->data;

  return display;

}

/**

 * gdk_wcstombs:

 * @src: a wide character string.

 * 

 * Converts a wide character string to a multi-byte string.

 * (The function name comes from an acronym of 'Wide Character String TO

 * Multi-Byte String').

 * 

 * Return value: the multi-byte string corresponding to @src, or %NULL if the

 * conversion failed. The returned string should be freed with g_free() when no

 * longer needed.

 **/

gchar *

gdk_wcstombs (const GdkWChar *src)

{

  gchar *mbstr;

  if (gdk_use_mb)

    {

      GdkDisplay *display = find_a_display ();

      Display *xdisplay = GDK_DISPLAY_XDISPLAY (display);

      XTextProperty tpr;

      if (sizeof(wchar_t) != sizeof(GdkWChar))

	{

	  gint i;

	  wchar_t *src_alt;

	  for (i=0; src[i]; i++);

	  src_alt = g_new (wchar_t, i+1);

	  for (; i>=0; i--)

	    src_alt[i] = src[i];

	  if (XwcTextListToTextProperty (xdisplay, &src_alt, 1, XTextStyle, &tpr)

	      != Success)

	    {

	      g_free (src_alt);

	      return NULL;

	    }

	  g_free (src_alt);

	}

      else

	{

	  wchar_t *tmp;

	  if (XwcTextListToTextProperty (xdisplay, &tmp, 1,

					 XTextStyle, &tpr) != Success)

	    {

	      return NULL;

	    }

	  src = (GdkWChar *)tmp;

	}

      /*

       * We must copy the string into an area allocated by glib, because

       * the string 'tpr.value' must be freed by XFree().

       */

      mbstr = g_strdup((gchar *)tpr.value);

      XFree (tpr.value);

    }

  else

    {

      gint length = 0;

      gint i;

      while (src[length] != 0)

	length++;

      mbstr = g_new (gchar, length + 1);

      for (i=0; i

	mbstr[i] = src[i];

    }

  return mbstr;

}

/**

 * gdk_mbstowcs:

 * @dest: the space to place the converted wide character string into.

 * @src: the multi-byte string to convert, which must be nul-terminated.

 * @dest_max: the maximum number of wide characters to place in @dest.

 * 

 * Converts a multi-byte string to a wide character string.

 * (The function name comes from an acronym of 'Multi-Byte String TO Wide

 * Character String').

 * 

 * Return value: the number of wide characters written into @dest, or -1 if 

 *   the conversion failed.

 **/

gint

gdk_mbstowcs (GdkWChar *dest, const gchar *src, gint dest_max)

{

  if (gdk_use_mb)

    {

      GdkDisplay *display = find_a_display ();

      Display *xdisplay = GDK_DISPLAY_XDISPLAY (display);

      XTextProperty tpr;

      wchar_t **wstrs, *wstr_src;

      gint num_wstrs;

      gint len_cpy;

      if (XmbTextListToTextProperty (xdisplay, (char **)&src, 1, XTextStyle,

				     &tpr)

	  != Success)

	{

	  /* NoMem or LocaleNotSupp */

	  return -1;

	}

      if (XwcTextPropertyToTextList (xdisplay, &tpr, &wstrs, &num_wstrs)

	  != Success)

	{

	  /* InvalidChar */

	  XFree(tpr.value);

	  return -1;

	}

      XFree(tpr.value);

      if (num_wstrs == 0)

	return 0;

      wstr_src = wstrs[0];

      for (len_cpy=0; len_cpy

	dest[len_cpy] = wstr_src[len_cpy];

      XwcFreeStringList (wstrs);

      return len_cpy;

    }

  else

    {

      gint i;

      for (i=0; i

	dest[i] = src[i];

      return i;

    }

}

#define __GDK_IM_X11_C__

#include "gdkaliasdef.c"