xref: /freebsd/contrib/diff/lib/hard-locale.c (revision e8d8bef961a50d4dc22501cde4fb9fb0be1b2532)
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 }
75