Function AirportMove

src/aircraft_cmd.cpp:1824–1869

gets pos from vehicle and next orders */

/* gets pos from vehicle and next orders */
static bool AirportMove(Aircraft *v, const AirportFTAClass *apc)
{
	/* error handling */
	if (v->pos >= apc->nofelements) {
		Debug(misc, 0, "[Ap] position {} is not valid for current airport. Max position is {}", v->pos, apc->nofelements - 1);
		assert(v->pos < apc->nofelements);
	}

	const AirportFTA *current = &apc->layout[v->pos];
	/* we have arrived in an important state (eg terminal, hangar, etc.) */
	if (current->heading == v->state) {
		uint8_t prev_pos = v->pos; // location could be changed in state, so save it before-hand
		uint8_t prev_state = v->state;
		_aircraft_state_handlers[v->state](v, apc);
		if (v->state != FLYING) v->previous_pos = prev_pos;
		if (v->state != prev_state || v->pos != prev_pos) UpdateAircraftCache(v);
		return true;
	}

	v->previous_pos = v->pos; // save previous location

	/* there is only one choice to move to */
	if (current->next == nullptr) {
		if (AirportSetBlocks(v, current, apc)) {
			v->pos = current->next_position;
			UpdateAircraftCache(v);
		} // move to next position
		return false;
	}

	/* there are more choices to choose from, choose the one that
	 * matches our heading */
	do {
		if (v->state == current->heading || current->heading == TO_ALL) {
			if (AirportSetBlocks(v, current, apc)) {
				v->pos = current->next_position;
				UpdateAircraftCache(v);
			} // move to next position
			return false;
		}
		current = current->next.get();
	} while (current != nullptr);

	Debug(misc, 0, "[Ap] cannot move further on Airport! (pos {} state {}) for vehicle {}", v->pos, v->state, v->index);
	NOT_REACHED();
}

/** returns true if the road ahead is busy, eg. you must wait before proceeding. */
static bool AirportHasBlock(Aircraft *v, const AirportFTA *current_pos, const AirportFTAClass *apc)