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