1/*
2 * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
3 * Use is subject to license terms.
4 */
5
6/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
7/*	  All Rights Reserved  	*/
8
9/*
10 * Copyright (c) 1980 Regents of the University of California.
11 * All rights reserved.  The Berkeley software License Agreement
12 * specifies the terms and conditions for redistribution.
13 */
14
15#pragma ident	"%Z%%M%	%I%	%E% SMI"
16
17/*LINTLIBRARY*/
18
19#ifndef lint
20static char
21sccsid[] = "@(#)overlay.c 1.9 89/07/13 SMI"; /* from UCB 5.2 86/02/12 */
22#endif /* not lint */
23
24#include	"curses.ext"
25#include	<ctype.h>
26
27#define	min(a, b)	((a) < (b) ? (a) : (b))
28#define	max(a, b)	((a) > (b) ? (a) : (b))
29
30/*
31 *	This routine writes win1 on win2 non-destructively.
32 */
33
34int
35overlay(WINDOW *win1, WINDOW *win2)
36{
37	char	*sp, *end;
38	int	x, y, endy, endx, starty, startx;
39	int 	y1, y2;
40
41#ifdef DEBUG
42	fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
43#endif
44	starty = max(win1->_begy, win2->_begy);
45	startx = max(win1->_begx, win2->_begx);
46	endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begy);
47	endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
48#ifdef DEBUG
49	fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n",
50	    starty, startx, endy, endx);
51#endif
52	if (starty >= endy || startx >= endx)
53		return (OK);
54	y1 = starty - win1->_begy;
55	y2 = starty - win2->_begy;
56	for (y = starty; y < endy; y++, y1++, y2++) {
57		end = &win1->_y[y1][endx - win1->_begx];
58		x = startx - win2->_begx;
59		for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
60			if (!isspace(*sp))
61				(void) mvwaddch(win2, y2, x, *sp);
62			x++;
63		}
64	}
65	return (OK);
66}
67