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