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diff --git a/macros/texinfo/texinfo/gnulib/lib/iswxdigit.c b/macros/texinfo/texinfo/gnulib/lib/iswxdigit.c
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+/* Test wide character for being a hexadecimal digit.
+ Copyright (C) 2020-2021 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, 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 <wctype.h>
+
+int
+iswxdigit (wint_t wc)
+{
+ return ((wc >= '0' && wc <= '9')
+#if 'A' == 0x41 && 'a' == 0x61
+ /* Optimization, assuming ASCII */
+ || ((wc & ~0x20) >= 'A' && (wc & ~0x20) <= 'F')
+#else
+ || (wc >= 'A' && wc <= 'F') || (wc >= 'a' && wc <= 'f')
+#endif
+ );
+}