1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved	*/
29
30/*
31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 * The Regents of the University of California
33 * All Rights Reserved
34 *
35 * University Acknowledgment- Portions of this document are derived from
36 * software developed by the University of California, Berkeley, and its
37 * contributors.
38 */
39
40#pragma ident	"%Z%%M%	%I%	%E% SMI"
41
42/*LINTLIBRARY*/
43
44#include	<sys/types.h>
45#include	"curses_inc.h"
46
47/*
48 * This routine writes Srcwin on Dstwin.
49 * Only the overlapping region is copied.
50 */
51
52int
53_overlap(WINDOW *Srcwin, WINDOW *Dstwin, int Overlay)
54{
55	int	sby, sbx, sey, sex, dby, dbx, dey, dex,
56		top, bottom, left, right;
57
58#ifdef	DEBUG
59	if (outf)
60		fprintf(outf, "OVERWRITE(0%o, 0%o);\n", Srcwin, Dstwin);
61#endif	/* DEBUG */
62
63	sby = Srcwin->_begy;	dby = Dstwin->_begy;
64	sbx = Srcwin->_begx;	dbx = Dstwin->_begx;
65	sey = sby + Srcwin->_maxy;	dey = dby + Dstwin->_maxy;
66	sex = sbx + Srcwin->_maxx;	dex = dbx + Dstwin->_maxx;
67
68	if (sey < dby || sby > dey || sex < dbx || sbx > dex)
69		return (ERR);
70
71	top = _MAX(sby, dby);	bottom = _MIN(sey, dey);
72	left = _MAX(sbx, dbx);	right = _MIN(sex, dex);
73
74	sby = top - sby;		sbx = left - sbx;
75	dey = bottom - dby - 1;	dex = right - dbx - 1;
76	dby = top - dby;		dbx = left - dbx;
77
78	return (copywin(Srcwin, Dstwin, sby, sbx, dby, dbx, dey, dex, Overlay));
79}
80