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