console_input:
  xor ax, ax
  int 0x16
  ; loop until we got >0
  test al, al
  jz console_input
  push ax
  push bx
  jmp console_output.shortcut
console_output:
  push ax
  push bx
  mov al, dl
.shortcut:
  mov ah, 0x0e
  xor bx, bx
  int 0x10
  pop bx
  pop ax
  ret

print_string:
  push si
  mov si, dx
.loop:
  mov dl, BYTE [si]
  cmp dl, '$'
  jz .end
  call console_output
  inc si
  jmp .loop
.end:
  pop si
  ret

read_buffer:
  push bx
  push si
  xor bx, bx
  mov si, dx
.loop:
  call console_input
  cmp al, 0x0D
  je .end
  cmp al, 8
  je .bs
  mov [si+bx+2], al
  inc bx
  cmp bl, [si]
  jc .loop
.end:
  mov byte [si+bx+2], 0x0D
  mov [si+1], bl
  pop si
  pop bx
  ret
.bs:
  test bx, bx
  jz .loop
  mov dl, 0x20
  call console_output
  mov dl, 8
  call console_output
  dec bx
  jmp .loop