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