1 #include <u.h> 2 #include <libc.h> 3 4 void* 5 memchr(void *ap, int c, ulong n) 6 { 7 uchar *sp; 8 9 sp = ap; 10 c &= 0xFF; 11 while(n > 0) { 12 if(*sp++ == c) 13 return sp-1; 14 n--; 15 } 16 return 0; 17 } 18