str_diff.c

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