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-rw-r--r--lib/setlocale_null.c411
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diff --git a/lib/setlocale_null.c b/lib/setlocale_null.c
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--- /dev/null
+++ b/lib/setlocale_null.c
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+/* Query the name of the current global locale.
+ Copyright (C) 2019-2022 Free Software Foundation, Inc.
+
+ This file 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.
+
+ This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2019. */
+
+#include <config.h>
+
+/* Specification. */
+#include "setlocale_null.h"
+
+#include <errno.h>
+#include <locale.h>
+#include <stdlib.h>
+#include <string.h>
+#if defined _WIN32 && !defined __CYGWIN__
+# include <wchar.h>
+#endif
+
+#if !(SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE)
+# if defined _WIN32 && !defined __CYGWIN__
+
+# define WIN32_LEAN_AND_MEAN /* avoid including junk */
+# include <windows.h>
+
+# elif HAVE_PTHREAD_API
+
+# include <pthread.h>
+# if HAVE_THREADS_H && HAVE_WEAK_SYMBOLS
+# include <threads.h>
+# pragma weak thrd_exit
+# define c11_threads_in_use() (thrd_exit != NULL)
+# else
+# define c11_threads_in_use() 0
+# endif
+
+# elif HAVE_THREADS_H
+
+# include <threads.h>
+
+# endif
+#endif
+
+/* Use the system's setlocale() function, not the gnulib override, here. */
+#undef setlocale
+
+static const char *
+setlocale_null_androidfix (int category)
+{
+ const char *result = setlocale (category, NULL);
+
+#ifdef __ANDROID__
+ if (result == NULL)
+ switch (category)
+ {
+ case LC_CTYPE:
+ case LC_NUMERIC:
+ case LC_TIME:
+ case LC_COLLATE:
+ case LC_MONETARY:
+ case LC_MESSAGES:
+ case LC_ALL:
+ case LC_PAPER:
+ case LC_NAME:
+ case LC_ADDRESS:
+ case LC_TELEPHONE:
+ case LC_MEASUREMENT:
+ result = "C";
+ break;
+ default:
+ break;
+ }
+#endif
+
+ return result;
+}
+
+static int
+setlocale_null_unlocked (int category, char *buf, size_t bufsize)
+{
+#if defined _WIN32 && !defined __CYGWIN__ && defined _MSC_VER
+ /* On native Windows, nowadays, the setlocale() implementation is based
+ on _wsetlocale() and uses malloc() for the result. We are better off
+ using _wsetlocale() directly. */
+ const wchar_t *result = _wsetlocale (category, NULL);
+
+ if (result == NULL)
+ {
+ /* CATEGORY is invalid. */
+ if (bufsize > 0)
+ /* Return an empty string in BUF.
+ This is a convenience for callers that don't want to write explicit
+ code for handling EINVAL. */
+ buf[0] = '\0';
+ return EINVAL;
+ }
+ else
+ {
+ size_t length = wcslen (result);
+ if (length < bufsize)
+ {
+ size_t i;
+
+ /* Convert wchar_t[] -> char[], assuming plain ASCII. */
+ for (i = 0; i <= length; i++)
+ buf[i] = result[i];
+
+ return 0;
+ }
+ else
+ {
+ if (bufsize > 0)
+ {
+ /* Return a truncated result in BUF.
+ This is a convenience for callers that don't want to write
+ explicit code for handling ERANGE. */
+ size_t i;
+
+ /* Convert wchar_t[] -> char[], assuming plain ASCII. */
+ for (i = 0; i < bufsize; i++)
+ buf[i] = result[i];
+ buf[bufsize - 1] = '\0';
+ }
+ return ERANGE;
+ }
+ }
+#else
+ const char *result = setlocale_null_androidfix (category);
+
+ if (result == NULL)
+ {
+ /* CATEGORY is invalid. */
+ if (bufsize > 0)
+ /* Return an empty string in BUF.
+ This is a convenience for callers that don't want to write explicit
+ code for handling EINVAL. */
+ buf[0] = '\0';
+ return EINVAL;
+ }
+ else
+ {
+ size_t length = strlen (result);
+ if (length < bufsize)
+ {
+ memcpy (buf, result, length + 1);
+ return 0;
+ }
+ else
+ {
+ if (bufsize > 0)
+ {
+ /* Return a truncated result in BUF.
+ This is a convenience for callers that don't want to write
+ explicit code for handling ERANGE. */
+ memcpy (buf, result, bufsize - 1);
+ buf[bufsize - 1] = '\0';
+ }
+ return ERANGE;
+ }
+ }
+#endif
+}
+
+#if !(SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE) /* musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku, Cygwin */
+
+/* Use a lock, so that no two threads can invoke setlocale_null_unlocked
+ at the same time. */
+
+/* Prohibit renaming this symbol. */
+# undef gl_get_setlocale_null_lock
+
+# if defined _WIN32 && !defined __CYGWIN__
+
+extern __declspec(dllimport) CRITICAL_SECTION *gl_get_setlocale_null_lock (void);
+
+static int
+setlocale_null_with_lock (int category, char *buf, size_t bufsize)
+{
+ CRITICAL_SECTION *lock = gl_get_setlocale_null_lock ();
+ int ret;
+
+ EnterCriticalSection (lock);
+ ret = setlocale_null_unlocked (category, buf, bufsize);
+ LeaveCriticalSection (lock);
+
+ return ret;
+}
+
+# elif HAVE_PTHREAD_API /* musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku, Cygwin */
+
+extern
+# if defined _WIN32 || defined __CYGWIN__
+ __declspec(dllimport)
+# endif
+ pthread_mutex_t *gl_get_setlocale_null_lock (void);
+
+# if HAVE_WEAK_SYMBOLS /* musl libc, FreeBSD, NetBSD, OpenBSD, Haiku */
+
+ /* Avoid the need to link with '-lpthread'. */
+# pragma weak pthread_mutex_lock
+# pragma weak pthread_mutex_unlock
+
+ /* Determine whether libpthread is in use. */
+# pragma weak pthread_mutexattr_gettype
+ /* See the comments in lock.h. */
+# define pthread_in_use() \
+ (pthread_mutexattr_gettype != NULL || c11_threads_in_use ())
+
+# else
+# define pthread_in_use() 1
+# endif
+
+static int
+setlocale_null_with_lock (int category, char *buf, size_t bufsize)
+{
+ if (pthread_in_use())
+ {
+ pthread_mutex_t *lock = gl_get_setlocale_null_lock ();
+ int ret;
+
+ if (pthread_mutex_lock (lock))
+ abort ();
+ ret = setlocale_null_unlocked (category, buf, bufsize);
+ if (pthread_mutex_unlock (lock))
+ abort ();
+
+ return ret;
+ }
+ else
+ return setlocale_null_unlocked (category, buf, bufsize);
+}
+
+# elif HAVE_THREADS_H
+
+extern mtx_t *gl_get_setlocale_null_lock (void);
+
+static int
+setlocale_null_with_lock (int category, char *buf, size_t bufsize)
+{
+ mtx_t *lock = gl_get_setlocale_null_lock ();
+ int ret;
+
+ if (mtx_lock (lock) != thrd_success)
+ abort ();
+ ret = setlocale_null_unlocked (category, buf, bufsize);
+ if (mtx_unlock (lock) != thrd_success)
+ abort ();
+
+ return ret;
+}
+
+# endif
+
+#endif
+
+int
+setlocale_null_r (int category, char *buf, size_t bufsize)
+{
+#if SETLOCALE_NULL_ALL_MTSAFE
+# if SETLOCALE_NULL_ONE_MTSAFE
+
+ return setlocale_null_unlocked (category, buf, bufsize);
+
+# else
+
+ if (category == LC_ALL)
+ return setlocale_null_unlocked (category, buf, bufsize);
+ else
+ return setlocale_null_with_lock (category, buf, bufsize);
+
+# endif
+#else
+# if SETLOCALE_NULL_ONE_MTSAFE
+
+ if (category == LC_ALL)
+ return setlocale_null_with_lock (category, buf, bufsize);
+ else
+ return setlocale_null_unlocked (category, buf, bufsize);
+
+# else
+
+ return setlocale_null_with_lock (category, buf, bufsize);
+
+# endif
+#endif
+}
+
+const char *
+setlocale_null (int category)
+{
+#if SETLOCALE_NULL_ALL_MTSAFE && SETLOCALE_NULL_ONE_MTSAFE
+ return setlocale_null_androidfix (category);
+#else
+
+ /* This call must be multithread-safe. To achieve this without using
+ thread-local storage:
+ 1. We use a specific static buffer for each possible CATEGORY
+ argument. So that different threads can call setlocale_mtsafe
+ with different CATEGORY arguments, without interfering.
+ 2. We use a simple strcpy or memcpy to fill this static buffer.
+ Filling it through, for example, strcpy + strcat would not be
+ guaranteed to leave the buffer's contents intact if another thread
+ is currently accessing it. If necessary, the contents is first
+ assembled in a stack-allocated buffer. */
+ if (category == LC_ALL)
+ {
+# if SETLOCALE_NULL_ALL_MTSAFE
+ return setlocale_null_androidfix (LC_ALL);
+# else
+ char buf[SETLOCALE_NULL_ALL_MAX];
+ static char resultbuf[SETLOCALE_NULL_ALL_MAX];
+
+ if (setlocale_null_r (LC_ALL, buf, sizeof (buf)))
+ return "C";
+ strcpy (resultbuf, buf);
+ return resultbuf;
+# endif
+ }
+ else
+ {
+# if SETLOCALE_NULL_ONE_MTSAFE
+ return setlocale_null_androidfix (category);
+# else
+ enum
+ {
+ LC_CTYPE_INDEX,
+ LC_NUMERIC_INDEX,
+ LC_TIME_INDEX,
+ LC_COLLATE_INDEX,
+ LC_MONETARY_INDEX,
+ LC_MESSAGES_INDEX,
+# ifdef LC_PAPER
+ LC_PAPER_INDEX,
+# endif
+# ifdef LC_NAME
+ LC_NAME_INDEX,
+# endif
+# ifdef LC_ADDRESS
+ LC_ADDRESS_INDEX,
+# endif
+# ifdef LC_TELEPHONE
+ LC_TELEPHONE_INDEX,
+# endif
+# ifdef LC_MEASUREMENT
+ LC_MEASUREMENT_INDEX,
+# endif
+# ifdef LC_IDENTIFICATION
+ LC_IDENTIFICATION_INDEX,
+# endif
+ LC_INDICES_COUNT
+ }
+ i;
+ char buf[SETLOCALE_NULL_MAX];
+ static char resultbuf[LC_INDICES_COUNT][SETLOCALE_NULL_MAX];
+ int err;
+
+ err = setlocale_null_r (category, buf, sizeof (buf));
+ if (err == EINVAL)
+ return NULL;
+ if (err)
+ return "C";
+
+ switch (category)
+ {
+ case LC_CTYPE: i = LC_CTYPE_INDEX; break;
+ case LC_NUMERIC: i = LC_NUMERIC_INDEX; break;
+ case LC_TIME: i = LC_TIME_INDEX; break;
+ case LC_COLLATE: i = LC_COLLATE_INDEX; break;
+ case LC_MONETARY: i = LC_MONETARY_INDEX; break;
+ case LC_MESSAGES: i = LC_MESSAGES_INDEX; break;
+# ifdef LC_PAPER
+ case LC_PAPER: i = LC_PAPER_INDEX; break;
+# endif
+# ifdef LC_NAME
+ case LC_NAME: i = LC_NAME_INDEX; break;
+# endif
+# ifdef LC_ADDRESS
+ case LC_ADDRESS: i = LC_ADDRESS_INDEX; break;
+# endif
+# ifdef LC_TELEPHONE
+ case LC_TELEPHONE: i = LC_TELEPHONE_INDEX; break;
+# endif
+# ifdef LC_MEASUREMENT
+ case LC_MEASUREMENT: i = LC_MEASUREMENT_INDEX; break;
+# endif
+# ifdef LC_IDENTIFICATION
+ case LC_IDENTIFICATION: i = LC_IDENTIFICATION_INDEX; break;
+# endif
+ default:
+ /* If you get here, a #ifdef LC_xxx is missing. */
+ abort ();
+ }
+
+ strcpy (resultbuf[i], buf);
+ return resultbuf[i];
+# endif
+ }
+#endif
+}