; AX = key pressed
; Waits until key is pressed before returning
os_read_input:
	mov ah, 11h			; BIOS call to check for key
	int 16h				; Interrupt
	jnz .key_pressed		; Jump if input isn't 0

	hlt
	jmp os_read_input

	.key_pressed:
		mov ah, 10h
		int 16h
		ret

; AX = key pressed
; Returns straight away
keyboard_check_key:
	xor ax,ax
	mov ah, 11h			; BIOS call to check for key
	int 16h				; Interrupt
	jz .no_key
	.no_key:
		xor ax,ax
		ret
; -------------------------------------------
; IN:
; AX = output address
; BX = max length

keyboard_display_input:
	pusha
	mov di, ax
	mov ax, bx

	.check_key_pressed:
		call os_read_input

		cmp al, 08h
		je .backspace

		cmp al, 0Dh
		je .enter_key

		cmp al, 1Bh
		je .esc_key

		dec bx

		cmp bx, 0
		je .enter_key           ; Once the limit is reached just enter it
		ja .print_current_input ; Echo the user input back

		jmp .check_key_pressed

	.esc_key:
		call power_reboot

	.enter_key:
		mov al, 0
		stosb
		popa
		ret ; Return to the parent function (whatever that may be)

	.backspace:
		cmp bx, 20						; Cannot backspace if the cursor is at the start
		jb .move_cursor_back			; then .move_cursor_back
		jmp .check_key_pressed			; Else check the next key

	.move_cursor_back:
		mov ah, 0Eh

		mov al, 08h
		int 10h
		mov al, 20h
		int 10h
		mov al, 08h
		int 10h

		inc bx
		dec di
		jmp .check_key_pressed

	.print_current_input: ; Echo back that character and return the key inputing
		stosb
		mov ah, 0Eh
		int 10h
		jmp .check_key_pressed

keyboard_get_cursor_pos:
	ret
keyboard_wait_for_key:	
	ret
keyboard_show_cursor:
	ret
keyboard_hide_cursor:
	ret
keyboard_move_cursor:
	ret