async_header_get_extended_tcode
ext_tcode = async_header_get_extended_tcode(r->request_header);
extended_tcode = async_header_get_extended_tcode(request_header);
tcode = 0x10 + async_header_get_extended_tcode(p->header);
ext_tcode = async_header_get_extended_tcode(packet->header);
*extended_tcode = async_header_get_extended_tcode(header);
*extended_tcode = async_header_get_extended_tcode(header);