1/* hard-locale.c -- Determine whether a locale is hard.
2
3   Copyright (C) 1997, 1998, 1999, 2002, 2003, 2004, 2006, 2007, 2009, 2010
4   Free Software 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 3 of the License, or
9   (at your option) 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, see <http://www.gnu.org/licenses/>.  */
18
19#include <config.h>
20
21#include "hard-locale.h"
22
23#include <locale.h>
24#include <stdlib.h>
25#include <string.h>
26
27#ifdef __GLIBC__
28# define GLIBC_VERSION __GLIBC__
29#else
30# define GLIBC_VERSION 0
31#endif
32
33/* Return true if the current CATEGORY locale is hard, i.e. if you
34   can't get away with assuming traditional C or POSIX behavior.  */
35bool
36hard_locale (int category)
37{
38  bool hard = true;
39  char const *p = setlocale (category, NULL);
40
41  if (p)
42    {
43      if (2 <= GLIBC_VERSION)
44        {
45          if (strcmp (p, "C") == 0 || strcmp (p, "POSIX") == 0)
46            hard = false;
47        }
48      else
49        {
50          char *locale = strdup (p);
51          if (locale)
52            {
53              /* Temporarily set the locale to the "C" and "POSIX" locales
54                 to find their names, so that we can determine whether one
55                 or the other is the caller's locale.  */
56              if (((p = setlocale (category, "C"))
57                   && strcmp (p, locale) == 0)
58                  || ((p = setlocale (category, "POSIX"))
59                      && strcmp (p, locale) == 0))
60                hard = false;
61
62              /* Restore the caller's locale.  */
63              setlocale (category, locale);
64              free (locale);
65            }
66        }
67    }
68
69  return hard;
70}
71