Routines
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A0F7: Fetch Object Pointer From Stack
Used by the routines at FollowLinkPointer, CheckCharacterBeingProcessed, RecordResultCharacterScript, ProcessObjectPointer, DispatchCharacterScript, FindCharacterScriptEntry_StartSearch, FindCharacterSavedPointer and ProcessCharacterAttribute.
Takes the record linked just before this one, or reports that the link is empty.
Input
IX Object pointer (on stack)
Output
IX Object pointer
HL Zero if object pointer was zero, otherwise preserved
This will be restored back into HL by the end of the routine.
FetchObjectPointerFromStack A0F7 PUSH HL Read the pointer saved ahead of this record.
A0F8 LD L,(IX-$02)
A0FB LD H,(IX-$01)
A0FE LD A,L Is HL zero?.
A0FF OR H
Pretty clever way of using the stack here.
A100 EX (SP),HL Swap the *SP with the object pointer, restoring HL to the original value.
A101 POP IX Restore the saved character record from the stack.
A103 RET Return.
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