Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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  1. #include "byte.h"
  2. /* byte_diff returns negative, 0, or positive, depending on whether the
  3. * string one[0], one[1], ..., one[len-1] is lexicographically smaller
  4. * than, equal to, or greater than the string one[0], one[1], ...,
  5. * one[len-1]. When the strings are different, byte_diff does not read
  6. * bytes past the first difference. */
  7. int byte_diff(const void* a, unsigned long len, const void* b) {
  8. register const char* s=a;
  9. register const char* t=b;
  10. register const char* u=t+len;
  11. register int j;
  12. j=0;
  13. for (;;) {
  14. if (t==u) break; if ((j=(*s-*t))) break; ++s; ++t;
  15. if (t==u) break; if ((j=(*s-*t))) break; ++s; ++t;
  16. if (t==u) break; if ((j=(*s-*t))) break; ++s; ++t;
  17. if (t==u) break; if ((j=(*s-*t))) break; ++s; ++t;
  18. }
  19. return j;
  20. }