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 * Make a derived window of an existing window. The two windows
49 * share the same character image.
50 * orig: the original window
51 * nl, nc: numbers of lines and columns
52 * by, bx: coordinates for upper-left corner of the derived
53 * window in the coord system of the parent window.
54 */
55
56 WINDOW *
derwin(WINDOW * orig,int num_lines,int nc,int by,int bx)57 derwin(WINDOW *orig, int num_lines, int nc, int by, int bx)
58 {
59 int y;
60 WINDOW *win = (WINDOW *) NULL, *par;
61 chtype **w_y, **o_y;
62 #ifdef _VR3_COMPAT_CODE
63 _ochtype **w_y16, **o_y16;
64 #endif /* _VR3_COMPAT_CODE */
65
66 /* make sure window fits inside the original one */
67 if (by < 0 || (by + num_lines) > orig->_maxy || bx < 0 ||
68 (bx + nc) > orig->_maxx)
69 goto done;
70 if (nc == 0)
71 nc = orig->_maxx - bx;
72 if (num_lines == 0)
73 num_lines = orig->_maxy - by;
74
75 /* Create the window skeleton */
76 if ((win = _makenew(num_lines, nc, by + orig->_begy,
77 bx + orig->_begx)) == NULL)
78 goto done;
79
80 /* inheritance */
81 /*LINTED*/
82 win->_parx = (short) bx;
83 /*LINTED*/
84 win->_pary = (short) by;
85 win->_bkgd = orig->_bkgd;
86 win->_attrs = orig->_attrs;
87 w_y = win->_y;
88 o_y = orig->_y;
89
90 #ifdef _VR3_COMPAT_CODE
91 if (_y16update) {
92 int hby = by;
93
94 w_y16 = win ->_y16;
95 o_y16 = orig->_y16;
96
97 for (y = 0; y < num_lines; y++, hby++)
98 w_y16[y] = o_y16[hby] + bx;
99 }
100 #endif /* _VR3_COMPAT_CODE */
101
102 for (y = 0; y < num_lines; y++, by++)
103 w_y[y] = o_y[by] + bx;
104
105 win->_yoffset = orig->_yoffset;
106
107 /* update descendant number of ancestors */
108 win->_parent = orig;
109 for (par = win->_parent; par != NULL; par = par->_parent)
110 par->_ndescs += 1;
111
112 done:
113 return (win);
114 }
115