gnu/dist/diffutils/lib/hard-locale.c

   1 /*      $NetBSD$        */
   2
   3 /* hard-locale.c -- Determine whether a locale is hard.
   4
   5    Copyright (C) 1997, 1998, 1999, 2002 Free Software Foundation, Inc.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software Foundation,
  19    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #if HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #if HAVE_LOCALE_H
  26 # include <locale.h>
  27 #endif
  28
  29 #if HAVE_STDLIB_H
  30 # include <stdlib.h>
  31 #endif
  32
  33 #if HAVE_STRING_H
  34 # include <string.h>
  35 #endif
  36
  37 #include "hard-locale.h"
  38
  39 /* Return nonzero if the current CATEGORY locale is hard, i.e. if you
  40    can't get away with assuming traditional C or POSIX behavior.  */
  41 int
  42 hard_locale (int category)
  43 {
  44 #if ! HAVE_SETLOCALE
  45   return 0;
  46 #else
  47
  48   int hard = 1;
  49   char const *p = setlocale (category, 0);
  50
  51   if (p)
  52     {
  53 # if defined __GLIBC__ && 2 <= __GLIBC__
  54       if (strcmp (p, "C") == 0 || strcmp (p, "POSIX") == 0)
  55         hard = 0;
  56 # else
  57       char *locale = malloc (strlen (p) + 1);
  58       if (locale)
  59         {
  60           strcpy (locale, p);
  61
  62           /* Temporarily set the locale to the "C" and "POSIX" locales
  63              to find their names, so that we can determine whether one
  64              or the other is the caller's locale.  */
  65           if (((p = setlocale (category, "C"))
  66                && strcmp (p, locale) == 0)
  67               || ((p = setlocale (category, "POSIX"))
  68                   && strcmp (p, locale) == 0))
  69             hard = 0;
  70
  71           /* Restore the caller's locale.  */
  72           setlocale (category, locale);
  73           free (locale);
  74         }
  75 # endif
  76     }
  77
  78   return hard;
  79
  80 #endif
  81 }