# include	"curses.h"

# define	min(a,b)	(a < b ? a : b)
# define	max(a,b)	(a > b ? a : b)

/*
 *	This routine writes win1 on win2.
 *	21-Oct-85 DK - Correct many errors.
 */
overwrite(win1, win2)
reg WINDOW	*win1, *win2; {

	reg char	*sp, *end;
	reg int		x, y, endy, endx, starty, startx, y_top,
			y_bot, x_left, x_right, y2;

# ifdef DEBUG
	fprintf(outf, "OVERWRITE(%0.2o, %0.2o);\n", win1, win2);
# endif
	y_top = max(win1->_begy, win2->_begy);
	y_bot = min(win1->_maxy + win1->_begy, win2->_maxy+win2->_begy);
	x_left = max(win1->_begx, win2->_begx);
	x_right = min(win1->_maxx+win1->_begx, win2->_maxx+win2->_begx);
	starty = y_top - win1->_begy;
	startx = x_left - win1->_begx;
	endy = y_bot - win1->_begy;
	endx = x_right - win1->_begx;
	for (y = starty; y < endy; y++) {
		end = &win1->_y[y][endx];
		x = x_left - win2->_begx;
		y2 = y + win1->_begy - win2->_begy;
		for (sp = &win1->_y[y][startx]; sp < end; sp++) {
			mvwaddch(win2, y2, x, *sp);
			x++;
		}
	}
}
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