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.  */
39int
40hard_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}
80