1 #include "str.h"

     2 

     3 int str_diff(s,t)

     4 register char *s;

     5 register char *t;

     6 {

     7   register char x;

     8 

     9   for (;;) {

    10     x = *s; if (x != *t) break; if (!x) break; ++s; ++t;

    11     x = *s; if (x != *t) break; if (!x) break; ++s; ++t;

    12     x = *s; if (x != *t) break; if (!x) break; ++s; ++t;

    13     x = *s; if (x != *t) break; if (!x) break; ++s; ++t;

    14   }

    15   return ((int)(unsigned int)(unsigned char) x)

    16        - ((int)(unsigned int)(unsigned char) *t);

    17 }