xref: /titanic_50/usr/src/lib/libcurses/screen/wsyncdown.c (revision 2654012f83cec5dc15b61dfe3e4a4915f186e7a6)
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 /* Make the changes in ancestors visible in win. */
48 
49 void
50 wsyncdown(WINDOW *win)
51 {
52 	short	*wbch, *wech, *pbch, *pech, bch, ech, endx;
53 	int	wy, px, py, endy;
54 	WINDOW	*par;
55 
56 	py = win->_pary;
57 	px = win->_parx;
58 	endy = win->_maxy;
59 	endx = win->_maxx - 1;
60 
61 	for (par = win->_parent; par != NULL; par = par->_parent) {
62 		if (par->_flags & (_WINCHANGED | _WIN_ADD_ONE |
63 		    _WIN_INS_ONE)) {
64 			wbch = win->_firstch;
65 			wech = win->_lastch;
66 			pbch = par->_firstch + py;
67 			pech = par->_lastch + py;
68 
69 			for (wy = 0; wy < endy; ++wy, ++wbch, ++wech,
70 			    ++pbch, ++pech) {
71 				if (*pbch != _INFINITY) {
72 					if ((bch = *pbch - px) < 0)
73 						bch = 0;
74 					if ((ech = *pech - px) > endx)
75 						ech = endx;
76 					if (!(bch > endx || ech < 0)) {
77 						if (*wbch > bch)
78 							*wbch = bch;
79 						if (*wech < ech)
80 							*wech = ech;
81 					}
82 				}
83 			}
84 			win->_flags |= _WINCHANGED;
85 		}
86 
87 		py += par->_pary;
88 		px += par->_parx;
89 	}
90 }
91