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 (c) 1995, by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 /*
28 * winsdel.c
29 *
30 * XCurses Library
31 *
32 * Copyright 1990, 1995 by Mortice Kern Systems. All rights reserved.
33 *
34 */
35
36 #ifdef M_RCSID
37 #ifndef lint
38 static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/winsdel.c 1.4 1995/06/21 20:31:02 ant Exp $";
39 #endif
40 #endif
41
42 #include <private.h>
43 #include <stdlib.h>
44
45 /*f
46 * Insert/delete rows from a window.
47 *
48 * Positive N inserts rows and negative N deletes. The size of the
49 * window remains fixed so that rows insert/deleted will cause rows to
50 * disappear/appear at the end of the window.
51 *
52 * NOTE: This routine called in doupdate.c with curscr as window.
53 */
54 int
winsdelln(w,n)55 winsdelln(w, n)
56 WINDOW *w;
57 int n;
58 {
59 int row;
60
61 #ifdef M_CURSES_TRACE
62 __m_trace("winsdelln(%p, %d)", w, n);
63 #endif
64
65 /* Check bounds and limit if necessary. */
66 if (w->_maxy < w->_cury + abs(n))
67 n = (w->_maxy - w->_cury + 1) * (n < 0 ? -1 : 1);
68
69 /* Insert/delete accomplished by pointer shuffling. */
70 if (n < 0) {
71 /* Delete n lines from current cursor line. */
72 (void) __m_ptr_move(
73 (void **) w->_line, w->_maxy,
74 w->_cury, w->_cury - (n+1), w->_maxy
75 );
76
77 /* Blank lines come in at the bottom of the screen. */
78 row = w->_maxy + n;
79 } else {
80 /* Insert n lines before current cursor line. */
81 (void) __m_ptr_move(
82 (void **) w->_line, w->_maxy,
83 w->_maxy - n, w->_maxy-1, w->_cury
84 );
85
86 /* Blank lines inserted at the cursor line. */
87 row = w->_cury;
88 }
89
90 /* Clear inserted/deleted lines. */
91 (void) __m_cc_erase(w, row, 0, row + abs(n), w->_maxx-1);
92
93 /* Mark from the cursor line to the end of window as dirty. */
94 (void) wtouchln(w, w->_cury, w->_maxy - w->_cury, 1);
95
96 /* If we insert/delete lines at the top of the screen and we're,
97 * permitted to scroll, then treat the action as a scroll.
98 */
99 if (w->_scroll && w->_cury == 0 && n != 0 && (w->_flags & W_FULL_WINDOW)
100 && w->_top == 0 && w->_bottom == w->_maxy)
101 w->_scroll += n;
102 else
103 w->_scroll = 0;
104
105 WSYNC(w);
106
107 return __m_return_code("winsdelln", WFLUSH(w));
108 }
109
110