#include <wchar.h>

wchar_t* wcschr(const wchar_t* s, wchar_t c) {
  if (!c)
    return (wchar_t*)s + wcslen(s);
  for (; *s && *s != c; s++)
    ;
  return *s ? (wchar_t*)s : 0;
}
