gnu/dist/gettext/gettext-tools/libgrep/hard-locale.c

   1 /* hard-locale.c -- Determine whether a locale is hard.
   2
   3    Copyright (C) 1997, 1998, 1999, 2002, 2003, 2004 Free Software
   4    Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software Foundation,
  18    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include "hard-locale.h"
  25
  26 #include <locale.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "strdup.h"
  31
  32 #ifdef __GLIBC__
  33 # define GLIBC_VERSION __GLIBC__
  34 #else
  35 # define GLIBC_VERSION 0
  36 #endif
  37
  38 /* Return true if the current CATEGORY locale is hard, i.e. if you
  39    can't get away with assuming traditional C or POSIX behavior.  */
  40 bool
  41 hard_locale (int category)
  42 {
  43   bool hard = true;
  44   char const *p = setlocale (category, NULL);
  45
  46   if (p)
  47     {
  48       if (2 <= GLIBC_VERSION)
  49         {
  50           if (strcmp (p, "C") == 0 || strcmp (p, "POSIX") == 0)
  51             hard = false;
  52         }
  53       else
  54         {
  55           char *locale = strdup (p);
  56           if (locale)
  57             {
  58               /* Temporarily set the locale to the "C" and "POSIX" locales
  59                  to find their names, so that we can determine whether one
  60                  or the other is the caller's locale.  */
  61               if (((p = setlocale (category, "C"))
  62                    && strcmp (p, locale) == 0)
  63                   || ((p = setlocale (category, "POSIX"))
  64                       && strcmp (p, locale) == 0))
  65                 hard = false;
  66
  67               /* Restore the caller's locale.  */
  68               setlocale (category, locale);
  69               free (locale);
  70             }
  71         }
  72     }
  73
  74   return hard;
  75 }