contrib/diffutils-2.8/lib/hard-locale.c

   1 /* hard-locale.c -- Determine whether a locale is hard.
   2
   3    Copyright (C) 1997, 1998, 1999, 2002, 2003 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #if HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 #include "hard-locale.h"
  24
  25 #if HAVE_LOCALE_H
  26 # include <locale.h>
  27 #endif
  28
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 /* Return nonzero if the current CATEGORY locale is hard, i.e. if you
  33    can't get away with assuming traditional C or POSIX behavior.  */
  34 int
  35 hard_locale (int category)
  36 {
  37 #if ! HAVE_SETLOCALE
  38   return 0;
  39 #else
  40
  41   int hard = 1;
  42   char const *p = setlocale (category, 0);
  43
  44   if (p)
  45     {
  46 # if defined __GLIBC__ && 2 <= __GLIBC__
  47       if (strcmp (p, "C") == 0 || strcmp (p, "POSIX") == 0)
  48         hard = 0;
  49 # else
  50       char *locale = malloc (strlen (p) + 1);
  51       if (locale)
  52         {
  53           strcpy (locale, p);
  54
  55           /* Temporarily set the locale to the "C" and "POSIX" locales
  56              to find their names, so that we can determine whether one
  57              or the other is the caller's locale.  */
  58           if (((p = setlocale (category, "C"))
  59                && strcmp (p, locale) == 0)
  60               || ((p = setlocale (category, "POSIX"))
  61                   && strcmp (p, locale) == 0))
  62             hard = 0;
  63
  64           /* Restore the caller's locale.  */
  65           setlocale (category, locale);
  66           free (locale);
  67         }
  68 # endif
  69     }
  70
  71   return hard;
  72
  73 #endif
  74 }