72 lines
2.9 KiB
C
72 lines
2.9 KiB
C
/* Table that maps a locale object to the names of the locale categories.
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Copyright (C) 2018-2025 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2018. */
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#if HAVE_WORKING_USELOCALE && HAVE_NAMELESS_LOCALES
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# include <stddef.h>
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# include <locale.h>
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# include "glthread/lock.h"
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/* Smallest among the six LC_* category values. */
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# define LCMIN (LC_ALL == 0 ? 1 : 0)
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struct locale_categories_names
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{
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/* (Locale category - LCMIN) -> name (allocated with indefinite extent). */
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const char *category_name[6];
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};
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/* A hash table of fixed size. Multiple threads can access it read-only
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simultaneously, but only one thread can insert into it or remove from it
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at the same time.
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This hash table has global scope, so that when an application uses both
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GNU libintl and gnulib, the application sees only one hash table. (When
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linking statically with libintl, the fact that localename-table.c is a
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separate compilation unit resolves the duplicate symbol conflict. When
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linking with libintl as a shared library, we rely on ELF and the symbol
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conflict resolution implemented in the ELF dynamic loader here.)
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Both the libintl overrides and the gnulib overrides of the functions
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newlocale, duplocale, freelocale see the same hash table (and the same lock).
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For this reason, the internal layout of the hash table and the hash function
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MUST NEVER CHANGE. If you need to change the internal layout or the hash
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function, introduce versioning by appending a version suffix to the symbols
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at the linker level. */
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# define locale_hash_function libintl_locale_hash_function
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# define locale_hash_table libintl_locale_hash_table
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# define locale_lock libintl_locale_lock
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extern size_t _GL_ATTRIBUTE_CONST locale_hash_function (locale_t x);
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/* A node in a hash bucket collision list. */
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struct locale_hash_node
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{
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struct locale_hash_node *next;
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locale_t locale;
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struct locale_categories_names names;
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};
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# define LOCALE_HASH_TABLE_SIZE 101
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extern struct locale_hash_node * locale_hash_table[LOCALE_HASH_TABLE_SIZE];
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/* This lock protects the locale_hash_table against multiple simultaneous
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accesses (except that multiple simultaneous read accesses are allowed). */
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gl_rwlock_define(extern, locale_lock)
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#endif
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