83 lines
3.4 KiB
C
83 lines
3.4 KiB
C
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/* Query the name of the current global locale.
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Copyright (C) 2019-2023 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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#ifndef _SETLOCALE_NULL_H
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#define _SETLOCALE_NULL_H
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#include <stddef.h>
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#include "arg-nonnull.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Recommended size of a buffer for a locale name for a single category.
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On glibc systems, you can have locale names that are relative file names;
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assume a maximum length 256.
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In native Windows, in 2018 the longest locale name was of length 58
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("FYRO Macedonian_Former Yugoslav Republic of Macedonia.1251"). */
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#define SETLOCALE_NULL_MAX (256+1)
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/* Recommended size of a buffer for a locale name with all categories.
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On glibc systems, you can have locale names that are relative file names;
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assume maximum length 256 for each. There are 12 categories; so, the
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maximum total length is 148+12*256.
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In native Windows, there are 5 categories, and the maximum total length is
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55+5*58. */
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#define SETLOCALE_NULL_ALL_MAX (148+12*256+1)
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/* setlocale_null_r (CATEGORY, BUF, BUFSIZE) is like setlocale (CATEGORY, NULL),
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except that
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- it is guaranteed to be multithread-safe,
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- it returns the resulting locale category name or locale name in the
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user-supplied buffer BUF, which must be BUFSIZE bytes long.
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The recommended minimum buffer size is
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- SETLOCALE_NULL_MAX for CATEGORY != LC_ALL, and
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- SETLOCALE_NULL_ALL_MAX for CATEGORY == LC_ALL.
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The return value is an error code: 0 if the call is successful, EINVAL if
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CATEGORY is invalid, or ERANGE if BUFSIZE is smaller than the length needed
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size (including the trailing NUL byte). In the latter case, a truncated
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result is returned in BUF, but still NUL-terminated if BUFSIZE > 0.
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For this call to be multithread-safe, *all* calls to
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setlocale (CATEGORY, NULL) in all other threads must have been converted
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to use setlocale_null_r or setlocale_null as well, and the other threads
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must not make other setlocale invocations (since changing the global locale
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has side effects on all threads). */
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extern int setlocale_null_r (int category, char *buf, size_t bufsize)
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_GL_ARG_NONNULL ((2));
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/* setlocale_null (CATEGORY) is like setlocale (CATEGORY, NULL), except that
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it is guaranteed to be multithread-safe.
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The return value is NULL if CATEGORY is invalid.
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For this call to be multithread-safe, *all* calls to
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setlocale (CATEGORY, NULL) in all other threads must have been converted
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to use setlocale_null_r or setlocale_null as well, and the other threads
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must not make other setlocale invocations (since changing the global locale
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has side effects on all threads). */
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extern const char *setlocale_null (int category);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SETLOCALE_NULL_H */
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