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 * wscrl.c
31 *
32 * XCurses Library
33 *
34 * Copyright 1990, 1995 by Mortice Kern Systems Inc.  All rights reserved.
35 *
36 */
37
38#ifdef M_RCSID
39#ifndef lint
40static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/wscrl.c 1.4 1995/07/26 17:43:20 ant Exp $";
41#endif
42#endif
43
44#include <private.h>
45#include <string.h>
46
47/*f
48 * For positive n scroll the window up n lines (line i+n becomes i);
49 * otherwise scroll the window down n lines.
50 */
51int
52wscrl(w, n)
53WINDOW *w;
54int n;
55{
56	int y, x, width, start, finish, to;
57
58#ifdef M_CURSES_TRACE
59	__m_trace("wscrl(%p, %d)", w, n);
60#endif
61
62	if (n == 0)
63		return __m_return_code("wscrl", OK);
64
65	/* Shuffle pointers in order to scroll.  The region
66	 * from start to finish inclusive will be moved to
67	 * either the top or bottom of _line[].
68	 */
69	if (0 < n) {
70		start = w->_top;
71		finish = w->_top + n - 1;
72		to = w->_bottom;
73	} else {
74		start = w->_bottom + n;
75		finish = w->_bottom - 1;
76		to = w->_top;
77	}
78
79	/* Blank out new lines. */
80	if (__m_cc_erase(w, start, 0, finish, w->_maxx-1) == -1)
81		return __m_return_code("wscrl", ERR);
82
83	/* Scroll lines by shuffling pointers. */
84	(void) __m_ptr_move((void **) w->_line, w->_maxy, start, finish, to);
85
86	if ((w->_flags & W_FULL_WINDOW)
87	&& w->_top == 0 && w->_bottom == w->_maxy)
88		w->_scroll += n;
89	else
90		w->_scroll = 0;
91
92	(void) wtouchln(w, 0, w->_maxy, 1);
93
94	WSYNC(w);
95
96	return __m_return_code("wscrl", WFLUSH(w));
97}
98