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diff --git a/lib/setlocale_null.h b/lib/setlocale_null.h
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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. */
+
+#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 */