1 /* Table that maps a locale object to the names of the locale categories. 2 Copyright (C) 2018-2019 Free Software Foundation, Inc. 3 4 This program is free software: you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 3 of the License, or 7 (at your option) any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 16 17 /* Written by Bruno Haible <bruno@clisp.org>, 2018. */ 18 19 #if HAVE_WORKING_USELOCALE && HAVE_NAMELESS_LOCALES 20 21 # include <stddef.h> 22 # include <locale.h> 23 24 # ifdef IN_LIBINTL 25 # include "lock.h" 26 # else 27 # include "glthread/lock.h" 28 # endif 29 30 struct locale_categories_names 31 { 32 /* Locale category -> name (allocated with indefinite extent). */ 33 const char *category_name[6]; 34 }; 35 36 /* A hash table of fixed size. Multiple threads can access it read-only 37 simultaneously, but only one thread can insert into it or remove from it 38 at the same time. 39 This hash table has global scope, so that when an application uses both 40 GNU libintl and gnulib, the application sees only one hash table. (When 41 linking statically with libintl, the fact that localename-table.c is a 42 separate compilation unit resolves the duplicate symbol conflict. When 43 linking with libintl as a shared library, we rely on ELF and the symbol 44 conflict resolution implemented in the ELF dynamic loader here.) 45 Both the libintl overrides and the gnulib overrides of the functions 46 newlocale, duplocale, freelocale see the same hash table (and the same lock). 47 For this reason, the internal layout of the hash table and the hash function 48 MUST NEVER CHANGE. If you need to change the internal layout or the hash 49 function, introduce versioning by appending a version suffix to the symbols 50 at the linker level. */ 51 # define locale_hash_function libintl_locale_hash_function 52 # define locale_hash_table libintl_locale_hash_table 53 # define locale_lock libintl_locale_lock 54 55 extern size_t _GL_ATTRIBUTE_CONST locale_hash_function (locale_t x); 56 57 /* A node in a hash bucket collision list. */ 58 struct locale_hash_node 59 { 60 struct locale_hash_node *next; 61 locale_t locale; 62 struct locale_categories_names names; 63 }; 64 65 # define LOCALE_HASH_TABLE_SIZE 101 66 extern struct locale_hash_node * locale_hash_table[LOCALE_HASH_TABLE_SIZE]; 67 68 /* This lock protects the locale_hash_table against multiple simultaneous 69 accesses (except that multiple simultaneous read accesses are allowed). */ 70 71 gl_rwlock_define(extern, locale_lock) 72 73 #endif 74