1 files changed, 42 insertions, 0 deletions
diff --git a/libc/src/wchar/wchar_utils.h b/libc/src/wchar/wchar_utils.h
new file mode 100644
index 0000000..55a3cee
--- /dev/null
+++ b/libc/src/wchar/wchar_utils.h
@@ -0,0 +1,42 @@
+//===-- wchar utils ---------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_WCHAR_WCHAR_UTILS_H
+#define LLVM_LIBC_SRC_WCHAR_WCHAR_UTILS_H
+
+#include "hdr/types/size_t.h"
+#include "hdr/types/wchar_t.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+
+namespace LIBC_NAMESPACE_DECL {
+namespace internal {
+
+LIBC_INLINE static const wchar_t *wcschr(const wchar_t *s, wchar_t c) {
+  for (; *s && *s != c; ++s)
+    ;
+  return (*s == c) ? s : nullptr;
+}
+
+// bool should be true for wcscspn for complimentary span
+// should be false for wcsspn since we want it to span
+LIBC_INLINE static size_t wcsspn(const wchar_t *s1, const wchar_t *s2,
+                                 bool not_match_set) {
+  size_t i = 0;
+  for (; s1[i]; ++i) {
+    bool in_set = internal::wcschr(s2, s1[i]);
+    if (in_set == not_match_set)
+      return i;
+  }
+  return i;
+}
+
+} // namespace internal
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif //  LLVM_LIBC_SRC_WCHAR_WCHAR_UTILS_H