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