Routines
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37491: Find Inventory Item
Used by the routines at HandlerDracula, HandlerFrankenstein and CheckDoorKey.
Looks for an item in the three slots of the inventory (see Inventory_Slot1). The sprite ID and the attribute of the item are at offsets 2 and 3 of each slot.
Input
D The attribute of the item
E The sprite ID of the item
Output
F The Z flag is set if the player has the item
FindInventoryItem 37491 LD B,3 B=3 (the number of slots in the inventory).
37493 LD HL,24114 Point HL at the sprite ID of the first slot at Inventory_Slot1_Sprite_Id.
FindInventoryItem_Loop 37496 LD A,(HL) Fetch the sprite ID of the slot.
37497 CP E Is it the sprite ID of the item?
37498 INC HL Move HL on to the attribute of the slot.
37499 JR NZ,FindInventoryItem_Next Jump to FindInventoryItem_Next if they are different.
37501 LD A,(HL) Fetch the attribute of the slot.
37502 CP D Return if the attribute matches too, as the player has the item.
37503 RET Z
FindInventoryItem_Next 37504 INC HL Move HL on to the next slot.
37505 INC HL
37506 INC HL
37507 DJNZ FindInventoryItem_Loop Decrease the slot counter by one and loop back to FindInventoryItem_Loop until all three slots have been checked.
37509 RET Return.
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