byte_diff.c

   1 #include "byte.h"
   2
   3 int byte_diff(s,n,t)
   4 register char *s;
   5 register unsigned int n;
   6 register char *t;
   7 {
   8   for (;;) {
   9     if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
  10     if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
  11     if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
  12     if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
  13   }
  14   return ((int)(unsigned int)(unsigned char) *s)
  15        - ((int)(unsigned int)(unsigned char) *t);
  16 }