1 files changed, 33 insertions, 0 deletions
diff --git a/lib/iswxdigit.c b/lib/iswxdigit.c
new file mode 100644
index 00000000..f20b9b36
--- /dev/null
+++ b/lib/iswxdigit.c
@@ -0,0 +1,33 @@
+/* Test wide character for being a hexadecimal digit.
+   Copyright (C) 2020-2022 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/>.  */
+
+#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
+         );
+}