Function getItemStackingBehavior

src/items.cpp:4376–4440

}

ItemStackResult getItemStackingBehavior(const int player, Item* itemToCheck, Item* itemDestinationStack, int& newQtyForCheckedItem, int& newQtyForDestItem)
{
	ItemStackResult itemStackResult;
	itemStackResult.itemToStackInto = nullptr;
	if ( !itemToCheck )
	{
		itemStackResult.resultType = ITEM_STACKING_ERROR;
		return itemStackResult;
	}

	if ( itemDestinationStack )
	{
		return getItemStackingBehaviorIndividualItemCheck(player, itemToCheck, itemDestinationStack, newQtyForCheckedItem, newQtyForDestItem);
	}

	itemStackResult.resultType = ITEM_ADDED_WITHOUT_NEEDING_STACK;
	newQtyForCheckedItem = itemToCheck->count;
	newQtyForDestItem = 0;

	for ( node_t* node = stats[player]->inventory.first; node != nullptr; node = node->next )
	{
		Item* item2 = static_cast<Item*>(node->element);
		if ( item2 )
		{
			int tmpQtyCheckedItem = newQtyForCheckedItem;
			int tmpQtyDestItem = newQtyForDestItem;
			auto res = getItemStackingBehaviorIndividualItemCheck(player, itemToCheck, item2, tmpQtyCheckedItem, tmpQtyDestItem);
			bool skipResult = false;
			switch ( res.resultType )
			{
				case ITEM_DESTINATION_NOT_SAME_ITEM:
				case ITEM_STACKING_ERROR:
				case ITEM_DESTINATION_STACK_IS_FULL:
					skipResult = true;
					break;
				default:
					break;
			}
			if ( skipResult )
			{
				continue;
			}
			
			// found a stack to add this item to
			newQtyForCheckedItem = tmpQtyCheckedItem;
			newQtyForDestItem = tmpQtyDestItem;
			res.itemToStackInto = item2;
			return res;
		}
	}

	itemStackResult.resultType = ITEM_ADDED_WITHOUT_NEEDING_STACK;
	int maxStack = itemToCheck->getMaxStackLimit(player);
	if ( itemToCheck->count > maxStack )
	{
		newQtyForCheckedItem = itemToCheck->count - maxStack;
		newQtyForDestItem = maxStack;
	}