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str_len.c (261B)

      1 /* Public domain. */
      2 
      3 #include "str.h"
      4 
      5 unsigned int str_len(const char *s)
      6 {
      7   register const char *t;
      8 
      9   t = s;
     10   for (;;) {
     11     if (!*t) return t - s; ++t;
     12     if (!*t) return t - s; ++t;
     13     if (!*t) return t - s; ++t;
     14     if (!*t) return t - s; ++t;
     15   }
     16 }