/* Table that maps a locale object to the names of the locale categories.

   Copyright (C) 2018-2019 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 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 General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>, 2018.  */

#if HAVE_WORKING_USELOCALE && HAVE_NAMELESS_LOCALES

# include <stddef.h>

# include <locale.h>

# ifdef IN_LIBINTL

#  include "lock.h"

# else

#  include "glthread/lock.h"

# endif

struct locale_categories_names

  {

    /* Locale category -> name (allocated with indefinite extent).  */

    const char *category_name[6];

  };

/* A hash table of fixed size.  Multiple threads can access it read-only

   simultaneously, but only one thread can insert into it or remove from it

   at the same time.

   This hash table has global scope, so that when an application uses both

   GNU libintl and gnulib, the application sees only one hash table.  (When

   linking statically with libintl, the fact that localename-table.c is a

   separate compilation unit resolves the duplicate symbol conflict.  When

   linking with libintl as a shared library, we rely on ELF and the symbol

   conflict resolution implemented in the ELF dynamic loader here.)

   Both the libintl overrides and the gnulib overrides of the functions

   newlocale, duplocale, freelocale see the same hash table (and the same lock).

   For this reason, the internal layout of the hash table and the hash function

   MUST NEVER CHANGE.  If you need to change the internal layout or the hash

   function, introduce versioning by appending a version suffix to the symbols

   at the linker level.  */

# define locale_hash_function libintl_locale_hash_function

# define locale_hash_table libintl_locale_hash_table

# define locale_lock libintl_locale_lock

extern size_t _GL_ATTRIBUTE_CONST locale_hash_function (locale_t x);

/* A node in a hash bucket collision list.  */

struct locale_hash_node

  {

    struct locale_hash_node *next;

    locale_t locale;

    struct locale_categories_names names;

  };

# define LOCALE_HASH_TABLE_SIZE 101

extern struct locale_hash_node * locale_hash_table[LOCALE_HASH_TABLE_SIZE];

/* This lock protects the locale_hash_table against multiple simultaneous

   accesses (except that multiple simultaneous read accesses are allowed).  */

gl_rwlock_define(extern, locale_lock)

#endif