1#include <wchar.h>
2
3wchar_t* wcsncpy(wchar_t* restrict d, const wchar_t* restrict s, size_t n) {
4    wchar_t* a = d;
5    while (n && *s)
6        n--, *d++ = *s++;
7    wmemset(d, 0, n);
8    return a;
9}
10