#include "str.h"unsigned int str_chr(s,c)register char *s;int c;{  register char ch;  register char *t;  ch = c;  t = s;  for (;;) {    if (!*t) break; if (*t == ch) break; ++t;    if (!*t) break; if (*t == ch) break; ++t;    if (!*t) break; if (*t == ch) break; ++t;    if (!*t) break; if (*t == ch) break; ++t;  }  return t - s;}