1 files changed, 75 insertions, 0 deletions
diff --git a/lib/hard-locale.c b/lib/hard-locale.c
new file mode 100644
index 000000000000..67a4144a6fec
--- /dev/null
+++ b/lib/hard-locale.c
@@ -0,0 +1,75 @@
+/* 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
+}