#include <locale.h> // setlocale()
#include <stdlib.h> // exit()

#include <curses.h>

#ifndef NCURSES_VERSION
#error this is not ncurses
#endif

#ifndef NCURSES_OPAQUE
#error this ncurses is not opaque
#endif

int main(void) {
	setlocale(LC_ALL, "");
	initscr();
	cbreak();
	echo();
	intrflush(stdscr, FALSE);
	keypad(stdscr, TRUE);
	scrollok(stdscr, TRUE);
	bkgd('+' | A_STANDOUT);
	clear();

	move((LINES - 1), 0);
	addstr("This is the bottom line.");
	move(0, 0);
	addstr("Press Enter, ^J, and/or ^M.");
	refresh();

	int ch;
	int status = 0;

	while (TRUE) {
		ch = getch();
		if (ERR == ch) {
			status = 1;
			break;
		}
		if (scroll(stdscr) == ERR) {
			status = 2;
			break;
		}
		if (addstr("X") == ERR) {
			status = 3;
			break;
		}
		if (refresh() == ERR) {
			status = 4;
			break;
		}
	}

	endwin();
	exit(status);
}