MyOS/notepad.asm at main · wailsb/MyOS · GitHub

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notepad_app:
    ; Clear screen
    mov ah, 0x00
    int 0x10

    ; Display notepad header
    mov bx, notepad_header
    call print_msg

    ; Initialize file system (if needed)
    call init_fs

    ; Loop to read and display characters
    notepad_loop:
        mov ah, 0x00
        int 0x16
        cmp al, 0x1B  ; ESC key to exit
        je notepad_exit
        cmp al, 0x13  ; Ctrl+S to save
        je save_file
        mov ah, 0x0E
        int 0x10
        call append_char_to_buffer
        jmp notepad_loop

    save_file:
        call save_buffer_to_disk
        jmp notepad_loop

    notepad_exit:
        ret

    append_char_to_buffer:
        ; Append character in AL to buffer
        ; ...implementation...
        ret

    save_buffer_to_disk:
        ; Save buffer to disk
        ; Switch to protected mode
        call switch_to_protected_mode
        ; ...implementation...
        ; Switch back to real mode
        call switch_to_real_mode
        ret

    switch_to_protected_mode:
        ; ...implementation...
        ret

    switch_to_real_mode:
        ; ...implementation...
        ret

    init_fs:
        ; Initialize file system
        ; ...implementation...
        ret

notepad_header:
    db "Notepad - Press ESC to exit, Ctrl+S to save", 0x0A, 0