#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;
}