lib/unicase/locale-language.c

   1 /* Language code of current locale.
   2    Copyright (C) 2009-2018 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2009.
   4
   5    This program is free software: you can redistribute it and/or modify it
   6    under the terms of the GNU Lesser General Public License as published
   7    by the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include "unicase.h"
  22
  23 #include <locale.h>
  24 #include <string.h>
  25
  26 #include "localename.h"
  27
  28 #include "unicase/locale-languages.h"
  29
  30 const char *
  31 uc_locale_language (void)
  32 {
  33   const char *locale_name = gl_locale_name (LC_CTYPE, "LC_CTYPE");
  34   const char *p;
  35
  36   /* Find the end of the language portion.  */
  37   p = locale_name;
  38   while (*p != '\0' && *p != '_' && *p != '.' && *p != '@')
  39     p++;
  40
  41   /* Return a statically allocated pointer to the language portion, so that the
  42      caller of this function does not need to free() the result.
  43      We could use a dynamically built unification table.  But given that the
  44      set of possible languages is small, it is easier (and excludes ENOMEM
  45      error conditions) to allocate the unification table statically.  */
  46   if (p != locale_name)
  47     {
  48       const char *language =
  49         uc_locale_languages_lookup (locale_name, p - locale_name);
  50       if (language != NULL)
  51         return language;
  52     }
  53
  54   return "";
  55 }