Fix inputString not counting chars, bksp offset

keyboard.inputString was not counting character limits properly due to
an error in the function's execution structure, and it did not properly
offset the character counter appropriately to compensate for backspaced
characters.

keyboard.ASM

@@ -74,21 +74,6 @@ macro keyboard.getKey
 .inputString.nextIteration:
 	loop	.inputString.getNextKey
 
-.inputString.backspace:
-	cmp		dx, di				; beginning of string?
-	je		.inputString.nextIteration
-	dec		di					; previous position in buffer
-	
-	cmp		bl, 0				; echo enabled?
-	jz		.inputString.nextIteration
-	string.putChar				; backspace cursor
-	mov		al, ' '
-	string.putChar				; blank that character
-	mov		al, 0x08
-	string.putChar				; and backspace again
-	
-	jmp		.inputString.nextIteration
-
 .inputString.appendTerminator:
 	mov		al, 0
 	mov		[di], al
@@ -100,4 +85,24 @@ macro keyboard.getKey
 	pop		bx
 	pop		ax
 	ret
+	
+.inputString.backspace:
+	cmp		dx, di				; beginning of string?
+	je		.inputString.getNextKey
+								; act like nothing ever happened
+	
+								; else...
+	dec		di					; previous position in buffer
+	
+	cmp		bl, 0				; echo enabled?
+	jz		.inputString.offsetCounter
+	string.putChar				; backspace cursor
+	mov		al, ' '
+	string.putChar				; blank that character
+	mov		al, 0x08
+	string.putChar				; and backspace again
+	
+.inputString.offsetCounter:
+	inc		cx
+	jmp		.inputString.getNextKey
 	

turtle.ASM

@@ -12,6 +12,7 @@
 	start.yPos	equ 12
 	promptColor	equ 0x1F		; white on blue text
 	fieldColor	equ 0x2F		; white on green text
+	turtleFace	equ 0x02		; filled smiley face
 
 ; ==============================
 ; === ENTRY POINT ==============
@@ -63,7 +64,7 @@ createScreen:
 		mov		cursor.xPos, start.xPos
 		mov		cursor.yPos, start.yPos
 		screen.text.setCursorPosition
-		mov		al, [data_turtle.face]
+		mov		al, turtleFace
 		string.putChar
 	
 	call	showHelp
@@ -76,7 +77,7 @@ createScreen:
 main:
 	; get command string from keyboard
 	; ==============================
-	mov		al, 8				; 23 max characters
+	mov		al, 8				; 8 max characters
 	mov		ah, 1				; echo enabled
 	mov		di, data_str.buffer	; pointer to string buffer
 	call	keyboard.inputString
@@ -152,7 +153,28 @@ handler:
 		; TODO
 		ret
 	.paint:
-		; TODO
+		mov		al, byte [data_turtle.paintToggle]
+		cmp		al, 0
+		jnz		.paint.disable
+		
+		.paint.enable:				; toggle bit to 1
+		mov		byte [data_turtle.paintToggle], 1
+		call	clearMessageArea	; clear message line
+		mov		cursor.xPos, 0		; "Paint enabled"
+		mov		cursor.yPos, 23
+		screen.text.setCursorPosition
+		mov		si, data_str.paintOn
+		call	string.teletype
+		ret
+		
+		.paint.disable:				; toggle bit to 0
+		mov		byte [data_turtle.paintToggle], 0
+		call	clearMessageArea	; clear message line
+		mov		cursor.xPos, 0		; "paint disabled"
+		mov		cursor.yPos, 23
+		screen.text.setCursorPosition
+		mov		si, data_str.paintOff
+		call	string.teletype
 		ret
 
 exit:
@@ -169,13 +191,28 @@ exit:
 ; === PROCEDURE SECTION ========
 ; ==============================
 
-showHelp:
+clearMessageArea:
 pusha
 
 	mov		cursor.xPos, 0		; position at 0, 23
 	mov		cursor.yPos, 23
+	screen.text.setCursorPosition
 	
+	mov		al, ' '
+	mov		bl, promptColor
+	mov		cx, 40
+	screen.text.setCharacter	; clear prompt line
+
+popa
+ret
+
+showHelp:
+pusha
+
+	mov		cursor.xPos, 0		; position at 0, 23
+	mov		cursor.yPos, 23
 	screen.text.setCursorPosition
+	
 	mov		si, data_str.help	; show help message
 	call	string.teletype
 	
@@ -189,6 +226,7 @@ pusha
 	mov		cursor.xPos, 0
 	mov		cursor.yPos, 24
 	screen.text.setCursorPosition
+	
 	mov		al, ' '
 	mov		bl, promptColor
 	mov		cx, 40
@@ -197,6 +235,7 @@ pusha
 	mov		cursor.xPos, 0		; position at 0, 24
 	mov		cursor.yPos, 24
 	screen.text.setCursorPosition
+	
 	mov		al, '>'
 	string.putChar				; display carat
 	
@@ -216,8 +255,8 @@ data_turtle:
 		db		?
 	.yPos:
 		db		?
-	.face:
-		db		0x02				; filled smiley face
+	.paintToggle:
+		db		0
 
 data_command:
 	.up: