1 files changed, 21 insertions, 0 deletions
diff --git a/src/wchar/wcscspn.c b/src/wchar/wcscspn.c
new file mode 100644
index 00000000..0c300a4a
--- /dev/null
+++ b/src/wchar/wcscspn.c
@@ -0,0 +1,21 @@
+#include <wchar.h>
+#include "nonstd/assert.h"
+
+size_t wcscspn(const wchar_t * s1, const wchar_t * s2)
+{
+	size_t i;
+
+	ASSERT_NONNULL(s1);
+	ASSERT_NONNULL(s2);
+
+	for (i = 0; s1[i] != L'\0'; i++) {
+		if (s1[i] == L'\0' || wcschr(s2, s1[i]) == NULL) {
+			return i;
+		}
+	}
+	return 0;
+}
+
+/*
+STDC(199409)
+*/