Heroes of Karn: Routine at 46432

46432: Validate If Item Is Present

Used by the routines at Parser_CheckObjectIsHere, CheckActiveScenicEvents, Handler_ScenicEvents, MovePlayerToRoom, Handler_ChangeRoom, Handler_ShowNewRoom and Action_Help.

Get Object Location.

Input
A	Object ID

Output
F	Z flag set if the object is available

ValidateItemPresent

46432

PUSH HL

Stash HL and DE on the stack.

46433

PUSH DE

46434

LD E,A

HL=Table_ItemLocations + the object ID.

46435

LD D,0

46437

LD HL,44406

46440

ADD HL,DE

46441

LD A,(44749)

A=*CurrentRoom.

Jump to Handler_Objects_Return if the object/ event table states that it's located in *the current room. Note also sets/ unsets the Z flag accordingly.

46444

CP (HL)

Jump to Handler_Objects_Return if the object is in the current room.

46445

JR Z,Handler_Objects_Return

Check the players inventory, as an object can still be used if it's being held.

46447

LD A,1

Lastly, set the Z flag if the item is in the players inventory.

46449

CP (HL)

Housekeeping; restore DE and HL to their previous values.

Handler_Objects_Return

46450

POP DE

Restore DE and HL from the stack.

46451

POP HL

46452

RET

Return.

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