#include <wchar.h>

wchar_t* wmemmove(wchar_t* d, const wchar_t* s, size_t n) {
  wchar_t* d0 = d;
  if ((size_t)(d - s) < n)
    while (n--)
      d[n] = s[n];
  else
    while (n--)
      *d++ = *s++;
  return d0;
}