read_line:
    pusha

    mov bx, read_buffer
    .loop:
        mov ah, 0x00
        int 0x16 ; Read char

        cmp al, 0x0D ; Is enter?
        jne .enter_end
            jmp .end
        .enter_end:

        cmp al, 0x08 ; Is backspace?
        jne .backspace_end
            ; Don't do anything if we're at col == 0
            cmp bx, read_buffer
            jle .backspace_end
        
            sub bx, 1
            mov ah, 0x0
            mov [bx], ah
            
            ; Erase the character on screen
            mov ah, 0x0e
            mov al, 0x08 ; Back one
            int 0x10
            mov al, 0x20 ; Erase it
            int 0x10
            mov al, 0x08 ; Back one more
            int 0x10
            
            jmp .loop
        .backspace_end

        ; Don't add any characters if over the limit
        cmp bx, read_buffer + 20
        jge .loop

        ; Add char to bx and incr
        mov [bx], al
        add bx, 1
        
        ; Display the character
        mov ah, 0x0e
        int 0x10

        jmp .loop
    .end:

    mov al, 0x0
    mov [bx], al ; Null terminater

    popa
    ret

read_buffer: resb 20