lib/hard-locale.c

   1 /* hard-locale.c -- Determine whether a locale is hard.
   2
   3    Copyright (C) 1997, 1998, 1999, 2002 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 #if HAVE_LOCALE_H
  24 # include <locale.h>
  25 #endif
  26
  27 #if HAVE_STDLIB_H
  28 # include <stdlib.h>
  29 #endif
  30
  31 #if HAVE_STRING_H
  32 # include <string.h>
  33 #endif
  34
  35 #include "hard-locale.h"
  36
  37 /* Return nonzero if the current CATEGORY locale is hard, i.e. if you
  38    can't get away with assuming traditional C or POSIX behavior.  */
  39 int
  40 hard_locale (int category)
  41 {
  42 #if ! HAVE_SETLOCALE
  43   return 0;
  44 #else
  45
  46   int hard = 1;
  47   char const *p = setlocale (category, 0);
  48
  49   if (p)
  50     {
  51 # if defined __GLIBC__ && 2 <= __GLIBC__
  52       if (strcmp (p, "C") == 0 || strcmp (p, "POSIX") == 0)
  53         hard = 0;
  54 # else
  55       char *locale = malloc (strlen (p) + 1);
  56       if (locale)
  57         {
  58           strcpy (locale, p);
  59
  60           /* Temporarily set the locale to the "C" and "POSIX" locales
  61              to find their names, so that we can determine whether one
  62              or the other is the caller's locale.  */
  63           if (((p = setlocale (category, "C"))
  64                && strcmp (p, locale) == 0)
  65               || ((p = setlocale (category, "POSIX"))
  66                   && strcmp (p, locale) == 0))
  67             hard = 0;
  68
  69           /* Restore the caller's locale.  */
  70           setlocale (category, locale);
  71           free (locale);
  72         }
  73 # endif
  74     }
  75
  76   return hard;
  77
  78 #endif
  79 }