1#include <wchar.h> 2 3wchar_t *wcsncat(wchar_t *restrict d, const wchar_t *restrict s, size_t n) 4{ 5 wchar_t *a = d; 6 d += wcslen(d); 7 while (n && *s) n--, *d++ = *s++; 8 *d++ = 0; 9 return a; 10} 11