/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1995, by Sun Microsystems, Inc.
* All rights reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* wscrl.c
*
* XCurses Library
*
* Copyright 1990, 1995 by Mortice Kern Systems Inc. All rights reserved.
*
*/
#ifdef M_RCSID
#ifndef lint
static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/wscrl.c 1.4 1995/07/26 17:43:20 ant Exp $";
#endif
#endif
#include <private.h>
#include <string.h>
/*f
* For positive n scroll the window up n lines (line i+n becomes i);
* otherwise scroll the window down n lines.
*/
int
wscrl(w, n)
WINDOW *w;
int n;
{
int y, x, width, start, finish, to;
#ifdef M_CURSES_TRACE
__m_trace("wscrl(%p, %d)", w, n);
#endif
if (n == 0)
return __m_return_code("wscrl", OK);
/* Shuffle pointers in order to scroll. The region
* from start to finish inclusive will be moved to
* either the top or bottom of _line[].
*/
if (0 < n) {
start = w->_top;
finish = w->_top + n - 1;
to = w->_bottom;
} else {
start = w->_bottom + n;
finish = w->_bottom - 1;
to = w->_top;
}
/* Blank out new lines. */
if (__m_cc_erase(w, start, 0, finish, w->_maxx-1) == -1)
return __m_return_code("wscrl", ERR);
/* Scroll lines by shuffling pointers. */
(void) __m_ptr_move((void **) w->_line, w->_maxy, start, finish, to);
if ((w->_flags & W_FULL_WINDOW)
&& w->_top == 0 && w->_bottom == w->_maxy)
w->_scroll += n;
else
w->_scroll = 0;
(void) wtouchln(w, 0, w->_maxy, 1);
WSYNC(w);
return __m_return_code("wscrl", WFLUSH(w));
}