411 lines
11 KiB
C
411 lines
11 KiB
C
/* Query the name of the current global locale.
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Copyright (C) 2019-2022 Free Software Foundation, Inc.
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This file 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
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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>, 2019. */
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#include <config.h>
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/* Specification. */
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#include "setlocale_null.h"
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#include <errno.h>
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#include <locale.h>
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#include <stdlib.h>
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#include <string.h>
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#if defined _WIN32 && !defined __CYGWIN__
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# include <wchar.h>
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#endif
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#if !(SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE)
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# if defined _WIN32 && !defined __CYGWIN__
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# define WIN32_LEAN_AND_MEAN /* avoid including junk */
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# include <windows.h>
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# elif HAVE_PTHREAD_API
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# include <pthread.h>
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# if HAVE_THREADS_H && HAVE_WEAK_SYMBOLS
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# include <threads.h>
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# pragma weak thrd_exit
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# define c11_threads_in_use() (thrd_exit != NULL)
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# else
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# define c11_threads_in_use() 0
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# endif
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# elif HAVE_THREADS_H
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# include <threads.h>
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# endif
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#endif
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/* Use the system's setlocale() function, not the gnulib override, here. */
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#undef setlocale
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static const char *
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setlocale_null_androidfix (int category)
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{
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const char *result = setlocale (category, NULL);
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#ifdef __ANDROID__
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if (result == NULL)
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switch (category)
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{
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case LC_CTYPE:
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case LC_NUMERIC:
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case LC_TIME:
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case LC_COLLATE:
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case LC_MONETARY:
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case LC_MESSAGES:
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case LC_ALL:
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case LC_PAPER:
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case LC_NAME:
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case LC_ADDRESS:
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case LC_TELEPHONE:
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case LC_MEASUREMENT:
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result = "C";
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break;
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default:
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break;
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}
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#endif
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return result;
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}
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static int
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setlocale_null_unlocked (int category, char *buf, size_t bufsize)
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{
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#if defined _WIN32 && !defined __CYGWIN__ && defined _MSC_VER
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/* On native Windows, nowadays, the setlocale() implementation is based
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on _wsetlocale() and uses malloc() for the result. We are better off
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using _wsetlocale() directly. */
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const wchar_t *result = _wsetlocale (category, NULL);
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if (result == NULL)
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{
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/* CATEGORY is invalid. */
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if (bufsize > 0)
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/* Return an empty string in BUF.
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This is a convenience for callers that don't want to write explicit
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code for handling EINVAL. */
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buf[0] = '\0';
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return EINVAL;
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}
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else
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{
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size_t length = wcslen (result);
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if (length < bufsize)
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{
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size_t i;
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/* Convert wchar_t[] -> char[], assuming plain ASCII. */
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for (i = 0; i <= length; i++)
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buf[i] = result[i];
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return 0;
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}
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else
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{
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if (bufsize > 0)
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{
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/* Return a truncated result in BUF.
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This is a convenience for callers that don't want to write
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explicit code for handling ERANGE. */
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size_t i;
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/* Convert wchar_t[] -> char[], assuming plain ASCII. */
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for (i = 0; i < bufsize; i++)
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buf[i] = result[i];
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buf[bufsize - 1] = '\0';
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}
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return ERANGE;
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}
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}
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#else
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const char *result = setlocale_null_androidfix (category);
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if (result == NULL)
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{
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/* CATEGORY is invalid. */
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if (bufsize > 0)
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/* Return an empty string in BUF.
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This is a convenience for callers that don't want to write explicit
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code for handling EINVAL. */
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buf[0] = '\0';
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return EINVAL;
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}
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else
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{
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size_t length = strlen (result);
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if (length < bufsize)
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{
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memcpy (buf, result, length + 1);
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return 0;
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}
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else
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{
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if (bufsize > 0)
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{
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/* Return a truncated result in BUF.
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This is a convenience for callers that don't want to write
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explicit code for handling ERANGE. */
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memcpy (buf, result, bufsize - 1);
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buf[bufsize - 1] = '\0';
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}
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return ERANGE;
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}
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}
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#endif
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}
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#if !(SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE) /* musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku, Cygwin */
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/* Use a lock, so that no two threads can invoke setlocale_null_unlocked
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at the same time. */
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/* Prohibit renaming this symbol. */
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# undef gl_get_setlocale_null_lock
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# if defined _WIN32 && !defined __CYGWIN__
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extern __declspec(dllimport) CRITICAL_SECTION *gl_get_setlocale_null_lock (void);
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static int
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setlocale_null_with_lock (int category, char *buf, size_t bufsize)
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{
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CRITICAL_SECTION *lock = gl_get_setlocale_null_lock ();
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int ret;
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EnterCriticalSection (lock);
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ret = setlocale_null_unlocked (category, buf, bufsize);
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LeaveCriticalSection (lock);
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return ret;
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}
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# elif HAVE_PTHREAD_API /* musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku, Cygwin */
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extern
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# if defined _WIN32 || defined __CYGWIN__
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__declspec(dllimport)
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# endif
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pthread_mutex_t *gl_get_setlocale_null_lock (void);
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# if HAVE_WEAK_SYMBOLS /* musl libc, FreeBSD, NetBSD, OpenBSD, Haiku */
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/* Avoid the need to link with '-lpthread'. */
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# pragma weak pthread_mutex_lock
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# pragma weak pthread_mutex_unlock
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/* Determine whether libpthread is in use. */
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# pragma weak pthread_mutexattr_gettype
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/* See the comments in lock.h. */
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# define pthread_in_use() \
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(pthread_mutexattr_gettype != NULL || c11_threads_in_use ())
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# else
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# define pthread_in_use() 1
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# endif
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static int
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setlocale_null_with_lock (int category, char *buf, size_t bufsize)
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{
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if (pthread_in_use())
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{
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pthread_mutex_t *lock = gl_get_setlocale_null_lock ();
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int ret;
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if (pthread_mutex_lock (lock))
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abort ();
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ret = setlocale_null_unlocked (category, buf, bufsize);
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if (pthread_mutex_unlock (lock))
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abort ();
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return ret;
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}
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else
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return setlocale_null_unlocked (category, buf, bufsize);
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}
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# elif HAVE_THREADS_H
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extern mtx_t *gl_get_setlocale_null_lock (void);
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static int
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setlocale_null_with_lock (int category, char *buf, size_t bufsize)
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{
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mtx_t *lock = gl_get_setlocale_null_lock ();
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int ret;
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if (mtx_lock (lock) != thrd_success)
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abort ();
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ret = setlocale_null_unlocked (category, buf, bufsize);
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if (mtx_unlock (lock) != thrd_success)
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abort ();
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return ret;
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}
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# endif
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#endif
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int
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setlocale_null_r (int category, char *buf, size_t bufsize)
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{
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#if SETLOCALE_NULL_ALL_MTSAFE
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# if SETLOCALE_NULL_ONE_MTSAFE
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return setlocale_null_unlocked (category, buf, bufsize);
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# else
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if (category == LC_ALL)
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return setlocale_null_unlocked (category, buf, bufsize);
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else
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return setlocale_null_with_lock (category, buf, bufsize);
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# endif
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#else
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# if SETLOCALE_NULL_ONE_MTSAFE
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if (category == LC_ALL)
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return setlocale_null_with_lock (category, buf, bufsize);
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else
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return setlocale_null_unlocked (category, buf, bufsize);
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# else
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return setlocale_null_with_lock (category, buf, bufsize);
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# endif
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#endif
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}
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const char *
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setlocale_null (int category)
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{
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#if SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE
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return setlocale_null_androidfix (category);
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#else
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/* This call must be multithread-safe. To achieve this without using
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thread-local storage:
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1. We use a specific static buffer for each possible CATEGORY
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argument. So that different threads can call setlocale_mtsafe
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with different CATEGORY arguments, without interfering.
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2. We use a simple strcpy or memcpy to fill this static buffer.
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Filling it through, for example, strcpy + strcat would not be
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guaranteed to leave the buffer's contents intact if another thread
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is currently accessing it. If necessary, the contents is first
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assembled in a stack-allocated buffer. */
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if (category == LC_ALL)
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{
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# if SETLOCALE_NULL_ALL_MTSAFE
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return setlocale_null_androidfix (LC_ALL);
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# else
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char buf[SETLOCALE_NULL_ALL_MAX];
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static char resultbuf[SETLOCALE_NULL_ALL_MAX];
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if (setlocale_null_r (LC_ALL, buf, sizeof (buf)))
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return "C";
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strcpy (resultbuf, buf);
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return resultbuf;
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# endif
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}
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else
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{
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# if SETLOCALE_NULL_ONE_MTSAFE
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return setlocale_null_androidfix (category);
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# else
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enum
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{
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LC_CTYPE_INDEX,
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LC_NUMERIC_INDEX,
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LC_TIME_INDEX,
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LC_COLLATE_INDEX,
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LC_MONETARY_INDEX,
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LC_MESSAGES_INDEX,
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# ifdef LC_PAPER
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LC_PAPER_INDEX,
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# endif
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# ifdef LC_NAME
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LC_NAME_INDEX,
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# endif
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# ifdef LC_ADDRESS
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LC_ADDRESS_INDEX,
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# endif
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# ifdef LC_TELEPHONE
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LC_TELEPHONE_INDEX,
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# endif
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# ifdef LC_MEASUREMENT
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LC_MEASUREMENT_INDEX,
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# endif
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# ifdef LC_IDENTIFICATION
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LC_IDENTIFICATION_INDEX,
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# endif
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LC_INDICES_COUNT
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}
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i;
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char buf[SETLOCALE_NULL_MAX];
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static char resultbuf[LC_INDICES_COUNT][SETLOCALE_NULL_MAX];
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int err;
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err = setlocale_null_r (category, buf, sizeof (buf));
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if (err == EINVAL)
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return NULL;
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if (err)
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return "C";
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switch (category)
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{
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case LC_CTYPE: i = LC_CTYPE_INDEX; break;
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case LC_NUMERIC: i = LC_NUMERIC_INDEX; break;
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case LC_TIME: i = LC_TIME_INDEX; break;
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case LC_COLLATE: i = LC_COLLATE_INDEX; break;
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case LC_MONETARY: i = LC_MONETARY_INDEX; break;
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case LC_MESSAGES: i = LC_MESSAGES_INDEX; break;
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# ifdef LC_PAPER
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case LC_PAPER: i = LC_PAPER_INDEX; break;
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# endif
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# ifdef LC_NAME
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case LC_NAME: i = LC_NAME_INDEX; break;
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# endif
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# ifdef LC_ADDRESS
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case LC_ADDRESS: i = LC_ADDRESS_INDEX; break;
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# endif
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# ifdef LC_TELEPHONE
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case LC_TELEPHONE: i = LC_TELEPHONE_INDEX; break;
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# endif
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# ifdef LC_MEASUREMENT
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case LC_MEASUREMENT: i = LC_MEASUREMENT_INDEX; break;
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# endif
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# ifdef LC_IDENTIFICATION
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case LC_IDENTIFICATION: i = LC_IDENTIFICATION_INDEX; break;
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# endif
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default:
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/* If you get here, a #ifdef LC_xxx is missing. */
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abort ();
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}
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strcpy (resultbuf[i], buf);
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return resultbuf[i];
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# endif
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}
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#endif
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}
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