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/* Query the name of the current global locale.
Copyright (C) 2019-2020 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>, 2019. */
#ifndef _SETLOCALE_NULL_H
#define _SETLOCALE_NULL_H
#include <stddef.h>
#include "arg-nonnull.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Recommended size of a buffer for a locale name for a single category.
On glibc systems, you can have locale names that are relative file names;
assume a maximum length 256.
In native Windows, in 2018 the longest locale name was of length 58
("FYRO Macedonian_Former Yugoslav Republic of Macedonia.1251"). */
#define SETLOCALE_NULL_MAX (256+1)
/* Recommended size of a buffer for a locale name with all categories.
On glibc systems, you can have locale names that are relative file names;
assume maximum length 256 for each. There are 12 categories; so, the
maximum total length is 148+12*256.
In native Windows, there are 5 categories, and the maximum total length is
55+5*58. */
#define SETLOCALE_NULL_ALL_MAX (148+12*256+1)
/* setlocale_null_r (CATEGORY, BUF, BUFSIZE) is like setlocale (CATEGORY, NULL),
except that
- it is guaranteed to be multithread-safe,
- it returns the resulting locale category name or locale name in the
user-supplied buffer BUF, which must be BUFSIZE bytes long.
The recommended minimum buffer size is
- SETLOCALE_NULL_MAX for CATEGORY != LC_ALL, and
- SETLOCALE_NULL_ALL_MAX for CATEGORY == LC_ALL.
The return value is an error code: 0 if the call is successful, EINVAL if
CATEGORY is invalid, or ERANGE if BUFSIZE is smaller than the length needed
size (including the trailing NUL byte). In the latter case, a truncated
result is returned in BUF, but still NUL-terminated if BUFSIZE > 0.
For this call to be multithread-safe, *all* calls to
setlocale (CATEGORY, NULL) in all other threads must have been converted
to use setlocale_null_r or setlocale_null as well, and the other threads
must not make other setlocale invocations (since changing the global locale
has side effects on all threads). */
extern int setlocale_null_r (int category, char *buf, size_t bufsize)
_GL_ARG_NONNULL ((2));
/* setlocale_null (CATEGORY) is like setlocale (CATEGORY, NULL), except that
it is guaranteed to be multithread-safe.
The return value is NULL if CATEGORY is invalid.
For this call to be multithread-safe, *all* calls to
setlocale (CATEGORY, NULL) in all other threads must have been converted
to use setlocale_null_r or setlocale_null as well, and the other threads
must not make other setlocale invocations (since changing the global locale
has side effects on all threads). */
extern const char *setlocale_null (int category);
#ifdef __cplusplus
}
#endif
#endif /* _SETLOCALE_NULL_H */
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