; cx: len_buffer
; si: buffer
; dl: start_x       NOTE: Will contain the end of the text on-screen
; dh: start_y       NOTE: Will contain the end of the text on-screen
print_string:
    
.prolog:
    push di
    push cx
    push bx
    push ax
    
    xor di, di          ; character index
    
.printing_loop:
    
.set_cursor_position:
    
    mov ah, 0x02
    mov bh, 0
    int 0x10
    
.write_character:
    
    push cx             ; save len_buffer
    
    ; get the current character
    mov bx, si
    add bx, di
    mov al, [bx]
    ; al now contains the current character
    
    ; set the other needed interrupt values
    mov ah, 0x0a        ; wanted function (write character at cursor position)
    mov bh, 0           ; page number
    mov cx, 1           ; repetitions of character
    int 0x10            ; call bios basic draw functions
    
    pop cx              ; restore len_buffer
    
    
    
    inc dl              ; go to next column
    
    ; go to a new line if needed
    cmp dl, 80
    jb .no_new_line_needed
    xor dl, dl
    inc dh              ; increase column
    
.no_new_line_needed:
    
    inc di              ; go to next character
    
    ; go further if the string-printing hasn't been finished
    cmp di, cx
    jb .printing_loop
    
.epilog:
    pop ax
    pop bx
    pop cx
    pop di
    
    ret