1 files changed, 5 insertions, 13 deletions
diff --git a/libc/src/wchar/wcscspn.cpp b/libc/src/wchar/wcscspn.cpp
index 8869d84..34f3451 100644
--- a/libc/src/wchar/wcscspn.cpp
+++ b/libc/src/wchar/wcscspn.cpp
@@ -12,23 +12,15 @@
 #include "hdr/types/wchar_t.h"
 #include "src/__support/common.h"
 #include "src/__support/macros/config.h"
+#include "src/__support/macros/null_check.h"
+#include "wchar_utils.h"
 
 namespace LIBC_NAMESPACE_DECL {
 
-bool check(wchar_t c, const wchar_t *s2) {
-  for (int n = 0; s2[n]; ++n) {
-    if (s2[n] == c)
-      return false;
-  }
-  return true;
-}
 LLVM_LIBC_FUNCTION(size_t, wcscspn, (const wchar_t *s1, const wchar_t *s2)) {
-  size_t i = 0;
-  for (; s1[i]; ++i) {
-    if (!check(s1[i], s2))
-      return i;
-  }
-  return i;
+  LIBC_CRASH_ON_NULLPTR(s1);
+  LIBC_CRASH_ON_NULLPTR(s2);
+  return internal::wcsspn(s1, s2, /*not_match_set=*/true);
 }
 
 } // namespace LIBC_NAMESPACE_DECL