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