missing/memcmp.c

   1 /* public domain rewrite of memcmp(3) */
   2
   3 #include <stddef.h>
   4
   5 int
   6 memcmp(const void *s1, const void *s2, size_t len)
   7 {
   8     register unsigned char *a = (unsigned char*)s1;
   9     register unsigned char *b = (unsigned char*)s2;
  10     register int tmp;
  11
  12     for (; len; --len) {
  13         if (tmp = *a++ - *b++)
  14             return tmp;
  15     }
  16     return 0;
  17 }