Routines
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49217: Handler: User Pressed "DELETE"
Used by the routine at Handler_UserInput.
Handles the user pressing delete.
Input
HL Current position in the command buffer
Test if the current position in the command buffer is at the start (48436) of the buffer.
UserInput_Delete 49217 EX DE,HL Jump back to UserInput_Loop if the user is already at the beginning of the command buffer.
49218 LD HL,48436
49221 AND A
49222 SBC HL,DE
49224 EX DE,HL
49225 JR Z,UserInput_Loop
Else delete the current character.
49227 PUSH HL Stash the pointer to the command buffer on the stack.
Print "BACKSPACE SPACE BACKSPACE" to move the current print position on the screen to the previous character, and to delete the charactr present using a space.
49228 LD HL,48520 HL=Messaging_BackspaceSpaceBackspace.
49231 CALL PrintString Call PrintString.
49234 POP HL Restore the pointer to the command buffer from the stack.
Now adjust the command buffer pointer to match the new position.
49235 DEC HL Decrease the pointer to the command buffer by one.
49236 LD (HL),32 Write an ASCII space (32) into the command buffer at the current position.
49238 JR UserInput_Loop Jump to UserInput_Loop.
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