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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
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[] = "$Header: /rd/src/libc/xcurses/rcs/winsdel.c 1.4 1995/06/21 20:31:02 ant Exp $";
41 #endif
42 #endif
43 
44 #include <private.h>
45 #include <stdlib.h>
46 
47 /*f
48  * Insert/delete rows from a window.
49  *
50  * Positive N inserts rows and negative N deletes.  The size of the
51  * window remains fixed so that rows insert/deleted will cause rows to
52  * disappear/appear at the end of the window.
53  *
54  * NOTE: This routine called in doupdate.c with curscr as window.
55  */
56 int
winsdelln(w,n)57 winsdelln(w, n)
58 WINDOW *w;
59 int n;
60 {
61 	int row;
62 
63 #ifdef M_CURSES_TRACE
64 	__m_trace("winsdelln(%p, %d)", w, n);
65 #endif
66 
67 	/* Check bounds and limit if necessary. */
68 	if (w->_maxy < w->_cury + abs(n))
69 		n = (w->_maxy - w->_cury + 1) * (n < 0 ? -1 : 1);
70 
71 	/* Insert/delete accomplished by pointer shuffling. */
72 	if (n < 0) {
73 		/* Delete n lines from current cursor line. */
74 		(void) __m_ptr_move(
75 			(void **) w->_line, w->_maxy,
76 			w->_cury, w->_cury - (n+1), w->_maxy
77 		);
78 
79 		/* Blank lines come in at the bottom of the screen. */
80 		row = w->_maxy + n;
81 	} else {
82 		/* Insert n lines before current cursor line. */
83 		(void) __m_ptr_move(
84 			(void **) w->_line, w->_maxy,
85 			w->_maxy - n, w->_maxy-1, w->_cury
86 		);
87 
88 		/* Blank lines inserted at the cursor line. */
89 		row = w->_cury;
90 	}
91 
92 	/* Clear inserted/deleted lines. */
93 	(void) __m_cc_erase(w, row, 0, row + abs(n), w->_maxx-1);
94 
95 	/* Mark from the cursor line to the end of window as dirty. */
96 	(void) wtouchln(w, w->_cury, w->_maxy - w->_cury, 1);
97 
98 	/* If we insert/delete lines at the top of the screen and we're,
99 	 * permitted to scroll, then treat the action as a scroll.
100 	 */
101 	if (w->_scroll && w->_cury == 0 && n != 0 && (w->_flags & W_FULL_WINDOW)
102 	&& w->_top == 0 && w->_bottom == w->_maxy)
103                 w->_scroll += n;
104         else
105                 w->_scroll = 0;
106 
107 	WSYNC(w);
108 
109 	return __m_return_code("winsdelln", WFLUSH(w));
110 }
111 
112