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byte_diff.c (464B)

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