#include <curses.h>
#include <err.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/select.h>

int
main()
{
	fd_set rfds;
	int c, in, n, out, startx, y;
	struct timeval tv;
	WINDOW *w;

	w = initscr();
	raw();
	noecho();
	timeout(1);

	if((in = open("/var/tmp/r.in", O_RDWR)) == -1)
		err(1, "/var/tmp/r.in");
	if((out = open("/var/tmp/r.out", O_RDWR)) == -1)
		err(1, "/var/tmp/r.out");

	tv.tv_sec = 0;
	tv.tv_usec = 1;
	FD_ZERO(&rfds);

	startx = 0;

	for(;;){
		FD_SET(out, &rfds);
		if(select(out+1, &rfds, NULL, NULL, &tv) > 0){
			read(out, &c, 1);
			printw("%c", c);

			startx = -1;
		}
		if((c = getch()) != ERR){
			if(startx == -1)
				startx = getcurx(w);
			if(c == 26) /* ^Z */
				break;
			if(c == 21){ /* ^U */
move:				y = getcury(w);
				move(y, startx);
				continue;
			}
			if(c == '\n')
				goto move;
			else
				printw("%c", c);
			write(in, &c, 1);
		}
	}

	echo();
	noraw();
	endwin();
}