tftpd: avoid buffer overflow report from glibc

    pe->e_msg = strerror(error - 100);

    tp->th_code = EUNDEF;   /* set 'undef' errorcode */

  }

  strcpy(tp->th_msg, pe->e_msg);

  length = (int)strlen(pe->e_msg);

  tp->th_msg[length] = '\0';

  /* we use memcpy() instead of strcpy() in order to avoid buffer overflow

   * report from glibc with FORTIFY_SOURCE */

  memcpy(tp->th_msg, pe->e_msg, length + 1);

  length += 5;

  if (swrite(peer, &buf.storage[0], length) != length)

    logmsg("nak: fail\n");