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/* Duplicate a locale object.
   Copyright (C) 2009 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 3 of the License, 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */

#include <config.h>

/* Specification.  */
#include <locale.h>

#include <errno.h>
#include <langinfo.h>
#include <string.h>

/* Work around an incorrect definition of the _NL_LOCALE_NAME macro in
   glibc < 2.12.
   See <http://sourceware.org/bugzilla/show_bug.cgi?id=10968>.  */
#undef _NL_LOCALE_NAME
#define _NL_LOCALE_NAME(category) _NL_ITEM ((category), _NL_ITEM_INDEX (-1))

#define SIZEOF(a) (sizeof(a) / sizeof(a[0]))

#undef duplocale

locale_t
rpl_duplocale (locale_t locale)
{
  /* Work around crash in the duplocale function in glibc < 2.12.
     See <http://sourceware.org/bugzilla/show_bug.cgi?id=10969>.  */
  if (locale == LC_GLOBAL_LOCALE)
    {
      /* Create a copy of the locale by fetching the name of each locale
	 category, starting with LC_CTYPE.  */
      static struct { int cat; int mask; } categories[] =
	{
	    { LC_NUMERIC,        LC_NUMERIC_MASK },
	    { LC_TIME,           LC_TIME_MASK },
	    { LC_COLLATE,        LC_COLLATE_MASK },
	    { LC_MONETARY,       LC_MONETARY_MASK },
	    { LC_MESSAGES,       LC_MESSAGES_MASK }
#ifdef LC_PAPER
	  , { LC_PAPER,          LC_PAPER_MASK }
#endif
#ifdef LC_NAME
	  , { LC_NAME,           LC_NAME_MASK }
#endif
#ifdef LC_ADDRESS
	  , { LC_ADDRESS,        LC_ADDRESS_MASK }
#endif
#ifdef LC_TELEPHONE
	  , { LC_TELEPHONE,      LC_TELEPHONE_MASK }
#endif
#ifdef LC_MEASUREMENT
	  , { LC_MEASUREMENT,    LC_MEASUREMENT_MASK }
#endif
#ifdef LC_IDENTIFICATION
	  , { LC_IDENTIFICATION, LC_IDENTIFICATION_MASK }
#endif
	};
      const char *base_name;
      locale_t base_copy;
      unsigned int i;

      base_name = nl_langinfo (_NL_LOCALE_NAME (LC_CTYPE));
      if (base_name[0] == '\0')
	/* Fallback code for glibc < 2.4, which did not implement
	   nl_langinfo (_NL_LOCALE_NAME (category)).  */
	base_name = setlocale (LC_CTYPE, NULL);
      base_copy = newlocale (LC_ALL_MASK, base_name, NULL);
      if (base_copy == NULL)
	return NULL;

      for (i = 0; i < SIZEOF (categories); i++)
	{
	  int category = categories[i].cat;
	  int category_mask = categories[i].mask;
	  const char *name = nl_langinfo (_NL_LOCALE_NAME (category));
	  if (name[0] == '\0')
	    /* Fallback code for glibc < 2.4, which did not implement
	       nl_langinfo (_NL_LOCALE_NAME (category)).  */
	    name = setlocale (category, NULL);
	  if (strcmp (name, base_name) != 0)
	    {
	      locale_t copy = newlocale (category_mask, name, base_copy);
	      if (copy == NULL)
		{
		  int saved_errno = errno;
		  freelocale (base_copy);
		  errno = saved_errno;
		  return NULL;
		}
	      /* No need to call freelocale (base_copy) if copy != base_copy;
		 the newlocale function already takes care of doing it.  */
	      base_copy = copy;
	    }
	}

      return base_copy;
    }

  return duplocale (locale);
}