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) 1995-1998 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /* LINTLIBRARY */
30
31 /*
32 * winsdel.c
33 *
34 * XCurses Library
35 *
36 * Copyright 1990, 1995 by Mortice Kern Systems. All rights reserved.
37 *
38 */
39
40 #ifdef M_RCSID
41 #ifndef lint
42 static char rcsID[] =
43 "$Header: /team/ps/sun_xcurses/archive/local_changes/xcurses/src/lib/"
44 "libxcurses/src/libc/xcurses/rcs/winsdel.c 1.3 1998/05/27 18:31:31 "
45 "cbates Exp $";
46 #endif
47 #endif
48
49 #include <private.h>
50 #include <stdlib.h>
51
52 /*
53 * Insert/delete rows from a window.
54 *
55 * Positive N inserts rows and negative N deletes. The size of the
56 * window remains fixed so that rows insert/deleted will cause rows to
57 * disappear/appear at the end of the window.
58 *
59 * NOTE: This routine called in doupdate.c with curscr as window.
60 */
61 int
winsdelln(WINDOW * w,int n)62 winsdelln(WINDOW *w, int n)
63 {
64 int row;
65
66 /* Check bounds and limit if necessary. */
67 if (w->_maxy < w->_cury + abs(n))
68 n = (w->_maxy - w->_cury + 1) * (n < 0 ? -1 : 1);
69
70 /* Insert/delete accomplished by pointer shuffling. */
71 if (n < 0) {
72 /* Delete n lines from current cursor line. */
73 (void) __m_ptr_move((void **) w->_line, w->_maxy,
74 w->_cury, w->_cury - (n + 1), w->_maxy);
75
76 /* Blank lines come in at the bottom of the screen. */
77 row = w->_maxy + n;
78 } else {
79 /* Insert n lines before current cursor line. */
80 (void) __m_ptr_move((void **) w->_line, w->_maxy,
81 w->_maxy - n, w->_maxy - 1, w->_cury);
82
83 /* Blank lines inserted at the cursor line. */
84 row = w->_cury;
85 }
86
87 /* Clear inserted/deleted lines. */
88 (void) __m_cc_erase(w, row, 0, row + abs(n) - 1, w->_maxx - 1);
89
90 /* Mark from the cursor line to the end of window as dirty. */
91 (void) wtouchln(w, w->_cury, w->_maxy - w->_cury, 1);
92
93 /*
94 * If we insert/delete lines at the top of the screen and we're,
95 * permitted to scroll, then treat the action as a scroll.
96 */
97 if (w->_scroll && w->_cury == 0 && n != 0 &&
98 (w->_flags & W_FULL_WINDOW) && w->_top == 0 &&
99 w->_bottom == w->_maxy)
100 w->_scroll += (short) n;
101 else
102 w->_scroll = 0;
103
104 WSYNC(w);
105
106 return (WFLUSH(w));
107 }
108