1 files changed, 28 insertions, 0 deletions
diff --git a/src/wctype/iswxdigit.c b/src/wctype/iswxdigit.c
new file mode 100644
index 00000000..b544b285
--- /dev/null
+++ b/src/wctype/iswxdigit.c
@@ -0,0 +1,28 @@
+#include <wctype.h>
+#include "wchar.h"
+#include "nonstd/assert.h"
+
+/** test whether a wide character is a hexadecimal digit **/
+int iswxdigit(wint_t wc)
+{
+	ASSERT_REPRESENTABLE(wc, WCHAR_MIN, WCHAR_MAX, "wchar_t", WEOF);
+
+	wctype_t xdigit = wctype("xdigit");
+	return iswctype(wc, xdigit);
+}
+
+/***
+The fn(iswxdigit) function tests whether arg(wc) is a wide character in the
+class cclass(xdigit) in the current locale.
+***/
+
+/* RETURN(NZ): arg(wc) is a hexadecimal digit */
+/* RETURN(0): arg(wc) is not a hexadecimal digit */
+
+/* UNSPECIFIED: - */
+/* IMPLEMENTATION: - */
+/* LOCALE: LC_CTYPE */
+
+/*
+STDC(199409)
+*/