Line data    Source code

       1             : /* localename.c - Determine the current selected locale.
       2             :  * Copyright (C) 1995-1999, 2000-2003, 2007,
       3             :  *               2008 Free Software Foundation, Inc.
       4             :  *
       5             :  * This file is free software; you can redistribute it and/or modify
       6             :  * it under the terms of either
       7             :  *
       8             :  *   - the GNU Lesser General Public License as published by the Free
       9             :  *     Software Foundation; either version 3 of the License, or (at
      10             :  *     your option) any later version.
      11             :  *
      12             :  * or
      13             :  *
      14             :  *   - the GNU General Public License as published by the Free
      15             :  *     Software Foundation; either version 2 of the License, or (at
      16             :  *     your option) any later version.
      17             :  *
      18             :  * or both in parallel, as here.
      19             :  *
      20             :  * This file is distributed in the hope that it will be useful,
      21             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      22             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      23             :  * GNU General Public License for more details.
      24             :  *
      25             :  * You should have received a copy of the GNU General Public
      26             :  * License along with this program; if not, see <http://www.gnu.org/licenses/>.
      27             :  */
      28             : /* Written by Ulrich Drepper <drepper@gnu.org>, 1995.  */
      29             : /* Win32 code written by Tor Lillqvist <tml@iki.fi>.  */
      30             : /* Modified for GpgOL use by Werner Koch <wk@gnupg.org>, 2005.  */
      31             : /* Modified for GnuPG use by Werner Koch <wk@gnupg.org>, 2007 */
      32             : 
      33             : #ifdef HAVE_CONFIG_H
      34             : # include <config.h>
      35             : #endif
      36             : 
      37             : #include <stdlib.h>
      38             : #include <string.h>
      39             : #ifdef HAVE_LOCALE_H
      40             : #include <locale.h>
      41             : #endif
      42             : #include <gpg-error.h> /* We need gettext_localename for W32. */
      43             : 
      44             : #include "../common/w32help.h"
      45             : 
      46             : /* XPG3 defines the result of 'setlocale (category, NULL)' as:
      47             :    "Directs 'setlocale()' to query 'category' and return the current
      48             :     setting of 'local'."
      49             :    However it does not specify the exact format.  Neither do SUSV2 and
      50             :    ISO C 99.  So we can use this feature only on selected systems (e.g.
      51             :    those using GNU C Library).  */
      52             : #if defined _LIBC || (defined __GNU_LIBRARY__ && __GNU_LIBRARY__ >= 2)
      53             : # define HAVE_LOCALE_NULL
      54             : #endif
      55             : 
      56             : /* Use a dummy value for LC_MESSAGES in case it is not defined.  This
      57             :    works because we always test for HAVE_LC_MESSAGES and the core
      58             :    function takes the category as a string as well.  */
      59             : #ifndef HAVE_LC_MESSAGES
      60             : #define LC_MESSAGES 0
      61             : #endif
      62             : 
      63             : 
      64             : /* Determine the current locale's name, and canonicalize it into XPG syntax
      65             :      language[_territory[.codeset]][@modifier]
      66             :    The codeset part in the result is not reliable; the locale_charset()
      67             :    should be used for codeset information instead.
      68             :    The result must not be freed; it is statically allocated.  */
      69             : 
      70             : #ifndef HAVE_W32_SYSTEM
      71             : static const char *
      72           0 : do_nl_locale_name (int category, const char *categoryname)
      73             : {
      74             :   const char *retval;
      75             : 
      76             :   /* Use the POSIX methods of looking to 'LC_ALL', 'LC_xxx', and 'LANG'.
      77             :      On some systems this can be done by the 'setlocale' function itself.  */
      78             : # if defined HAVE_SETLOCALE && defined HAVE_LC_MESSAGES && defined HAVE_LOCALE_NULL
      79             :   (void)categoryname;
      80           0 :   retval = setlocale (category, NULL);
      81             : # else
      82             :   /* Setting of LC_ALL overwrites all other.  */
      83             :   retval = getenv ("LC_ALL");
      84             :   if (retval == NULL || retval[0] == '\0')
      85             :     {
      86             :       /* Next comes the name of the desired category.  */
      87             :       retval = getenv (categoryname);
      88             :       if (retval == NULL || retval[0] == '\0')
      89             :         {
      90             :           /* Last possibility is the LANG environment variable.  */
      91             :           retval = getenv ("LANG");
      92             :           if (retval == NULL || retval[0] == '\0')
      93             :             /* We use C as the default domain.  POSIX says this is
      94             :                implementation defined.  */
      95             :             retval = "C";
      96             :         }
      97             :     }
      98             : # endif
      99             : 
     100           0 :   return retval;
     101             : }
     102             : #endif /* HAVE_W32_SYSTEM */
     103             : 
     104             : 
     105             : 
     106             : /* Return the locale used for translatable messages.  The standard C
     107             :    and POSIX are locale names are mapped to an empty string.  If a
     108             :    locale can't be found an empty string will be returned.  */
     109             : const char *
     110           0 : gnupg_messages_locale_name (void)
     111             : {
     112             :   const char *s;
     113             : 
     114             : #ifdef HAVE_W32_SYSTEM
     115             :   /* We use the localename function libgpg-error.  */
     116             :   s = gettext_localename ();
     117             : #else
     118           0 :   s = do_nl_locale_name (LC_MESSAGES, "LC_MESSAGES");
     119             : #endif
     120           0 :   if (!s)
     121           0 :     s = "";
     122           0 :   else if (!strcmp (s, "C") || !strcmp (s, "POSIX"))
     123           0 :     s = "";
     124             : 
     125           0 :   return s;
     126             : }