1 #include "str.h"

     2 

     3 unsigned int str_len(char *s)

     4 {

     5   register char *t;

     6 

     7   t = s;

     8   for (;;) {

     9     if (!*t) return t - s; ++t;

    10     if (!*t) return t - s; ++t;

    11     if (!*t) return t - s; ++t;

    12     if (!*t) return t - s; ++t;

    13   }

    14 }