title: problem with printf
body: <p>...</p>
  
  <pre>
  uint64_t                 expires_time;
  ngx_memcpy(data, in, in_len);
  data_size = in_len + sizeof(expires_time);
  expires_time = (uint64_t) now;
  expires_time = ngx_http_encrypted_session_htonll(expires_time);
  ngx_memcpy(data + in_len, (u_char *) &expires_time, sizeof(expires_time));
  MD5(data, data_size, p);
  
  static inline uint64_t
  
  ngx_http_encrypted_session_htonll(uint64_t n) {
  #ifdef htonll
  return htonll(n);
  # else
  return ((uint64_t) htonl(n) > 32);
  #endif
  }
  </pre>
  
  <p>Why I want to try <code>printf("%s",data)</code> result: in. <code>ngx_memcpy</code> should be add <code>expires_time</code> for this string ? How to see md5 in string length <code>data_size</code>  ?</p>