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 * wscrl.c
29 *
30 * XCurses Library
31 *
32 * Copyright 1990, 1995 by Mortice Kern Systems Inc. All rights reserved.
33 *
34 */
35
36 #ifdef M_RCSID
37 #ifndef lint
38 static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/wscrl.c 1.4 1995/07/26 17:43:20 ant Exp $";
39 #endif
40 #endif
41
42 #include <private.h>
43 #include <string.h>
44
45 /*f
46 * For positive n scroll the window up n lines (line i+n becomes i);
47 * otherwise scroll the window down n lines.
48 */
49 int
wscrl(w,n)50 wscrl(w, n)
51 WINDOW *w;
52 int n;
53 {
54 int y, x, width, start, finish, to;
55
56 #ifdef M_CURSES_TRACE
57 __m_trace("wscrl(%p, %d)", w, n);
58 #endif
59
60 if (n == 0)
61 return __m_return_code("wscrl", OK);
62
63 /* Shuffle pointers in order to scroll. The region
64 * from start to finish inclusive will be moved to
65 * either the top or bottom of _line[].
66 */
67 if (0 < n) {
68 start = w->_top;
69 finish = w->_top + n - 1;
70 to = w->_bottom;
71 } else {
72 start = w->_bottom + n;
73 finish = w->_bottom - 1;
74 to = w->_top;
75 }
76
77 /* Blank out new lines. */
78 if (__m_cc_erase(w, start, 0, finish, w->_maxx-1) == -1)
79 return __m_return_code("wscrl", ERR);
80
81 /* Scroll lines by shuffling pointers. */
82 (void) __m_ptr_move((void **) w->_line, w->_maxy, start, finish, to);
83
84 if ((w->_flags & W_FULL_WINDOW)
85 && w->_top == 0 && w->_bottom == w->_maxy)
86 w->_scroll += n;
87 else
88 w->_scroll = 0;
89
90 (void) wtouchln(w, 0, w->_maxy, 1);
91
92 WSYNC(w);
93
94 return __m_return_code("wscrl", WFLUSH(w));
95 }
96