zircon/third_party/ulib/musl/src/string/wcscspn.c

#include <wchar.h>

size_t wcscspn(const wchar_t* s, const wchar_t* c) {
  const wchar_t* a;
  if (!c[0])
    return wcslen(s);
  if (!c[1])
    return (s = wcschr(a = s, *c)) ? s - a : wcslen(a);
  for (a = s; *s && !wcschr(c, *s); s++)
    ;
  return s - a;
}