1 #include <u.h> 2 #include <libc.h> 3 4 char* 5 strncat(char *s1, char *s2, int n) 6 { 7 char *os1; 8 9 os1 = s1; 10 while(*s1++) 11 ; 12 s1--; 13 while(*s1++ = *s2++) 14 if(--n < 0) { 15 s1[-1] = 0; 16 break; 17 } 18 return os1; 19 } 20