Plan 9 from Bell Labs’s /usr/web/sources/contrib/anothy/src/lib/djb-ape/byte/byte_diff.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
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#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);
}

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