1 #include "str.h"

     2 

     3 unsigned int str_len(s)

     4 register char *s;

     5 {

     6   register char *t;

     7 

     8   t = s;

     9   for (;;) {

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

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

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

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

    14   }

    15 }