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