mac_mmc_mp_left
const size_t mp_left = mac_mmc_mp_left(cursor);
if (mac_mmc_mp_left(cursor) != 0) {
const size_t mp_left = mac_mmc_mp_left(cursor);
if (mac_mmc_mp_left(cursor) == 0) {
const size_t mp_left = mac_mmc_mp_left(cursor);