/* Duplicate handle for selection of locales.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C Library 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 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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 the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <locale.h>

#include <libc-lock.h>

#include <stdlib.h>

#include <string.h>

#include <localeinfo.h>

/* Lock for protecting global data.  */

__libc_rwlock_define (extern , __libc_setlocale_lock attribute_hidden)

locale_t

__duplocale (locale_t dataset)

{

  /* This static object is returned for newlocale (LC_ALL_MASK, "C").  */

  if (dataset == _nl_C_locobj_ptr)

    return dataset;

  /* Handle a special value.  */

  if (dataset == LC_GLOBAL_LOCALE)

    dataset = &_nl_global_locale;

  locale_t result;

  int cnt;

  size_t names_len = 0;

  /* Calculate the total space we need to store all the names.  */

  for (cnt = 0; cnt < __LC_LAST; ++cnt)

    if (cnt != LC_ALL && dataset->__names[cnt] != _nl_C_name)

      names_len += strlen (dataset->__names[cnt]) + 1;

  /* Get memory.  */

  result = malloc (sizeof (struct __locale_struct) + names_len);

  if (result != NULL)

    {

      char *namep = (char *) (result + 1);

      /* We modify global data (the usage counts).  */

      __libc_rwlock_wrlock (__libc_setlocale_lock);

      for (cnt = 0; cnt < __LC_LAST; ++cnt)

	if (cnt != LC_ALL)

	  {

	    result->__locales[cnt] = dataset->__locales[cnt];

	    if (result->__locales[cnt]->usage_count < MAX_USAGE_COUNT)

	      ++result->__locales[cnt]->usage_count;

	    if (dataset->__names[cnt] == _nl_C_name)

	      result->__names[cnt] = _nl_C_name;

	    else

	      {

		result->__names[cnt] = namep;

		namep = __stpcpy (namep, dataset->__names[cnt]) + 1;

	      }

	  }

      /* Update the special members.  */

      result->__ctype_b = dataset->__ctype_b;

      result->__ctype_tolower = dataset->__ctype_tolower;

      result->__ctype_toupper = dataset->__ctype_toupper;

      /* It's done.  */

      __libc_rwlock_unlock (__libc_setlocale_lock);

    }

  return result;

}

weak_alias (__duplocale, duplocale)