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-rw-r--r--lib/hard-locale.c75
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diff --git a/lib/hard-locale.c b/lib/hard-locale.c
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+/* hard-locale.c -- Determine whether a locale is hard.
+
+ Copyright (C) 1997, 1998, 1999, 2002, 2003, 2004 Free Software
+ Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "hard-locale.h"
+
+#if HAVE_LOCALE_H
+# include <locale.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+
+/* Return true if the current CATEGORY locale is hard, i.e. if you
+ can't get away with assuming traditional C or POSIX behavior. */
+bool
+hard_locale (int category)
+{
+#if ! HAVE_SETLOCALE
+ return false;
+#else
+
+ bool hard = true;
+ char const *p = setlocale (category, NULL);
+
+ if (p)
+ {
+# if defined __GLIBC__ && 2 <= __GLIBC__
+ if (strcmp (p, "C") == 0 || strcmp (p, "POSIX") == 0)
+ hard = false;
+# else
+ char *locale = malloc (strlen (p) + 1);
+ if (locale)
+ {
+ strcpy (locale, p);
+
+ /* Temporarily set the locale to the "C" and "POSIX" locales
+ to find their names, so that we can determine whether one
+ or the other is the caller's locale. */
+ if (((p = setlocale (category, "C"))
+ && strcmp (p, locale) == 0)
+ || ((p = setlocale (category, "POSIX"))
+ && strcmp (p, locale) == 0))
+ hard = false;
+
+ /* Restore the caller's locale. */
+ setlocale (category, locale);
+ free (locale);
+ }
+# endif
+ }
+
+ return hard;
+
+#endif
+}