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