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diff --git a/lib/wcrtomb.c b/lib/wcrtomb.c
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+/* Convert wide character to multibyte character.
+ Copyright (C) 2008-2020 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2008.
+
+ 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/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include <wchar.h>
+
+#include <errno.h>
+#include <stdlib.h>
+
+
+size_t
+wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
+#undef wcrtomb
+{
+ /* This implementation of wcrtomb supports only stateless encodings.
+ ps must be in the initial state. */
+ if (ps != NULL && !mbsinit (ps))
+ {
+ errno = EINVAL;
+ return (size_t)(-1);
+ }
+
+#if !HAVE_WCRTOMB /* IRIX 6.5 */ \
+ || WCRTOMB_RETVAL_BUG /* Solaris 11.3, MSVC */ \
+ || WCRTOMB_C_LOCALE_BUG /* Android */
+ if (s == NULL)
+ /* We know the NUL wide character corresponds to the NUL character. */
+ return 1;
+ else
+#endif
+ {
+#if HAVE_WCRTOMB
+# if WCRTOMB_C_LOCALE_BUG /* Android */
+ /* Implement consistently with mbrtowc(): through a 1:1 correspondence,
+ as in ISO-8859-1. */
+ if (wc >= 0 && wc <= 0xff)
+ {
+ *s = (unsigned char) wc;
+ return 1;
+ }
+ else
+ {
+ errno = EILSEQ;
+ return (size_t)(-1);
+ }
+# else
+ return wcrtomb (s, wc, ps);
+# endif
+#else /* IRIX 6.5 */
+ /* Fallback for platforms that don't have wcrtomb().
+ Implement on top of wctomb().
+ This code is not multithread-safe. */
+ int ret = wctomb (s, wc);
+
+ if (ret >= 0)
+ return ret;
+ else
+ {
+ errno = EILSEQ;
+ return (size_t)(-1);
+ }
+#endif
+ }
+}