/* localename.c - Determine the current selected locale.

 * Copyright (C) 1995-1999, 2000-2003, 2007,

 *               2008 Free Software Foundation, Inc.

 *

 * This file is free software; you can redistribute it and/or modify

 * it under the terms of either

 *

 *   - the GNU Lesser General Public License as published by the Free

 *     Software Foundation; either version 3 of the License, or (at

 *     your option) any later version.

 *

 * or

 *

 *   - the GNU General Public License as published by the Free

 *     Software Foundation; either version 2 of the License, or (at

 *     your option) any later version.

 *

 * or both in parallel, as here.

 *

 * This file 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public

 * License along with this program; if not, see <https://www.gnu.org/licenses/>.

 */

/* Written by Ulrich Drepper <drepper@gnu.org>, 1995.  */

/* Win32 code written by Tor Lillqvist <tml@iki.fi>.  */

/* Modified for GpgOL use by Werner Koch <wk@gnupg.org>, 2005.  */

/* Modified for GnuPG use by Werner Koch <wk@gnupg.org>, 2007 */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <stdlib.h>

#include <string.h>

#ifdef HAVE_LOCALE_H

#include <locale.h>

#endif

#include <gpg-error.h> /* We need gettext_localename for W32. */

#include "../common/w32help.h"

/* XPG3 defines the result of 'setlocale (category, NULL)' as:

   "Directs 'setlocale()' to query 'category' and return the current

    setting of 'local'."

   However it does not specify the exact format.  Neither do SUSV2 and

   ISO C 99.  So we can use this feature only on selected systems (e.g.

   those using GNU C Library).  */

#if defined _LIBC || (defined __GNU_LIBRARY__ && __GNU_LIBRARY__ >= 2)

# define HAVE_LOCALE_NULL

#endif

/* Use a dummy value for LC_MESSAGES in case it is not defined.  This

   works because we always test for HAVE_LC_MESSAGES and the core

   function takes the category as a string as well.  */

#ifndef HAVE_LC_MESSAGES

#define LC_MESSAGES 0

#endif

/* Determine the current locale's name, and canonicalize it into XPG syntax

     language[_territory[.codeset]][@modifier]

   The codeset part in the result is not reliable; the locale_charset()

   should be used for codeset information instead.

   The result must not be freed; it is statically allocated.  */

#ifndef HAVE_W32_SYSTEM

static const char *

do_nl_locale_name (int category, const char *categoryname)

{

  const char *retval;

  /* Use the POSIX methods of looking to 'LC_ALL', 'LC_xxx', and 'LANG'.

     On some systems this can be done by the 'setlocale' function itself.  */

# if defined HAVE_SETLOCALE && defined HAVE_LC_MESSAGES && defined HAVE_LOCALE_NULL

  (void)categoryname;

  retval = setlocale (category, NULL);

# else

  (void)category;

  /* Setting of LC_ALL overwrites all other.  */

  retval = getenv ("LC_ALL");

  if (retval == NULL || retval[0] == '\0')

    {

      /* Next comes the name of the desired category.  */

      retval = getenv (categoryname);

      if (retval == NULL || retval[0] == '\0')

  {

    /* Last possibility is the LANG environment variable.  */

    retval = getenv ("LANG");

    if (retval == NULL || retval[0] == '\0')

      /* We use C as the default domain.  POSIX says this is

         implementation defined.  */

      retval = "C";

  }

    }

# endif

  return retval;

}

#endif /* HAVE_W32_SYSTEM */

/* Return the locale used for translatable messages.  The standard C

   and POSIX are locale names are mapped to an empty string.  If a

   locale can't be found an empty string will be returned.  */

const char *

gnupg_messages_locale_name (void)

{

  const char *s;

#ifdef HAVE_W32_SYSTEM

  /* We use the localename function libgpg-error.  */

  s = gettext_localename ();

#else

  s = do_nl_locale_name (LC_MESSAGES, "LC_MESSAGES");

#endif

  if (!s)

    s = "";

  else if (!strcmp (s, "C") || !strcmp (s, "POSIX"))

    s = "";

  return s;

}