byte_diff.c

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/* Public domain. */

#include "byte.h"

int byte_diff(register const void *_s,register unsigned int n,register const void *_t)
{
  register const char *s = _s;
  register const char *t = _t;
  for (;;) {
    if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
    if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
    if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
    if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
  }
  return ((int)(unsigned int)(unsigned char) *s)
       - ((int)(unsigned int)(unsigned char) *t);
}