#include <unistd.h>
#include <curses.h>

#define Sleep(n) sleep(n)

int
main(void)
{
    int i;
    int y = 0, x = 0, top_of_screen = 0, bottom_of_screen = 0;

    initscr();
    WINDOW *pad = newpad(LINES * 2, COLS);
    scrollok(pad, TRUE);

    getmaxyx(pad, y, x);

    top_of_screen = y - LINES;
    bottom_of_screen = top_of_screen + LINES - 1;

    wmove(pad, top_of_screen, 0);
    waddstr(pad, "TOP OF SCREEN");
    wmove(pad, bottom_of_screen, 0);
    waddstr(pad, "BOTTOM OF SCREEN");

    for (i = top_of_screen + 1; i < bottom_of_screen; i++)
        mvwaddstr(pad, i, 0, "XXXXXXX");
    prefresh(pad, top_of_screen, 0, 0, 0, LINES - 1, COLS - 1);

    wsetscrreg(pad, top_of_screen + 1, bottom_of_screen - 1);
    for (i = 0; i < LINES + 10; i++){
        wscrl(pad, i % 2? i : -i);
        prefresh(pad, top_of_screen, 0, 0, 0, LINES - 1, COLS - 1);
        Sleep(1);
    }

    Sleep(10);
    endwin();
    return 0;
}