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 /*LINTLIBRARY*/
41
42 #include <sys/types.h>
43 #include "curses_inc.h"
44
45 /*
46 * This routine writes Srcwin on Dstwin.
47 * Only the overlapping region is copied.
48 */
49
50 int
_overlap(WINDOW * Srcwin,WINDOW * Dstwin,int Overlay)51 _overlap(WINDOW *Srcwin, WINDOW *Dstwin, int Overlay)
52 {
53 int sby, sbx, sey, sex, dby, dbx, dey, dex,
54 top, bottom, left, right;
55
56 #ifdef DEBUG
57 if (outf)
58 fprintf(outf, "OVERWRITE(0%o, 0%o);\n", Srcwin, Dstwin);
59 #endif /* DEBUG */
60
61 sby = Srcwin->_begy; dby = Dstwin->_begy;
62 sbx = Srcwin->_begx; dbx = Dstwin->_begx;
63 sey = sby + Srcwin->_maxy; dey = dby + Dstwin->_maxy;
64 sex = sbx + Srcwin->_maxx; dex = dbx + Dstwin->_maxx;
65
66 if (sey < dby || sby > dey || sex < dbx || sbx > dex)
67 return (ERR);
68
69 top = _MAX(sby, dby); bottom = _MIN(sey, dey);
70 left = _MAX(sbx, dbx); right = _MIN(sex, dex);
71
72 sby = top - sby; sbx = left - sbx;
73 dey = bottom - dby - 1; dex = right - dbx - 1;
74 dby = top - dby; dbx = left - dbx;
75
76 return (copywin(Srcwin, Dstwin, sby, sbx, dby, dbx, dey, dex, Overlay));
77 }
78