Fixed some bugs with inputs

source/kernel/features/keyboard.asm

@@ -15,6 +15,7 @@ os_read_input:
 
 ; AX = key pressed
 ; Returns straight away
+; carry flag is set when escape is pressed and data is returned straight away
 keyboard_check_key:
 	xor ax,ax
 	mov ah, 11h			; BIOS call to check for key
@@ -27,11 +28,11 @@ keyboard_check_key:
 ; IN:
 ; AX = output address
 ; BX = max length
-
 keyboard_display_input:
 	pusha
 	mov di, ax
-	mov ax, bx
+	xor ax,ax
+	mov [prompt_length], bx
 
 	.check_key_pressed:
 		call os_read_input
@@ -54,7 +55,9 @@ keyboard_display_input:
 		jmp .check_key_pressed
 
 	.esc_key:
-		call power_reboot
+		stc
+		popa
+		ret
 
 	.enter_key:
 		mov al, 0
@@ -63,7 +66,7 @@ keyboard_display_input:
 		ret ; Return to the parent function (whatever that may be)
 
 	.backspace:
-		cmp bx, 20						; Cannot backspace if the cursor is at the start
+		cmp bx, [prompt_length]						; 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
 
@@ -86,6 +89,7 @@ keyboard_display_input:
 		mov ah, 0Eh
 		int 10h
 		jmp .check_key_pressed
+	.input_length db 0
 
 keyboard_get_cursor_pos:
 	ret