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 
52 int
_overlap(WINDOW * Srcwin,WINDOW * Dstwin,int Overlay)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