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/* $NetBSD: scroll.c,v 1.22 2010/02/03 15:34:40 roy Exp $ */
/*
* Copyright (c) 1981, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)scroll.c 8.3 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: scroll.c,v 1.22 2010/02/03 15:34:40 roy Exp $");
#endif
#endif /* not lint */
#include "curses.h"
#include "curses_private.h"
/*
* scroll --
* Scroll the window up a line.
*/
int
scroll(WINDOW *win)
{
return(wscrl(win, 1));
}
#ifndef _CURSES_USE_MACROS
/*
* scrl --
* Scroll stdscr n lines - up if n is positive, down if n is negative.
*/
int
scrl(int nlines)
{
return wscrl(stdscr, nlines);
}
/*
* setscrreg --
* Set the top and bottom of the scrolling region for stdscr.
*/
int
setscrreg(int top, int bottom)
{
return wsetscrreg(stdscr, top, bottom);
}
#endif
/*
* wscrl --
* Scroll a window n lines - up if n is positive, down if n is negative.
*/
int
wscrl(WINDOW *win, int nlines)
{
int oy, ox;
#ifdef DEBUG
__CTRACE(__CTRACE_WINDOW, "wscrl: (%p) lines=%d\n", win, nlines);
#endif
if (!(win->flags & __SCROLLOK))
return (ERR);
if (!nlines)
return (OK);
getyx(win, oy, ox);
#ifdef DEBUG
__CTRACE(__CTRACE_WINDOW, "wscrl: y=%d\n", oy);
#endif
if (oy < win->scr_t || oy > win->scr_b)
/* Outside scrolling region */
wmove(win, 0, 0);
else
/* Inside scrolling region */
wmove(win, win->scr_t, 0);
winsdelln(win, 0 - nlines);
wmove(win, oy, ox);
if (win == curscr) {
__cputchar('\n');
if (!__NONL)
win->curx = 0;
#ifdef DEBUG
__CTRACE(__CTRACE_WINDOW, "scroll: win == curscr\n");
#endif
}
return (OK);
}
/*
* wsetscrreg --
* Set the top and bottom of the scrolling region for win.
*/
int
wsetscrreg(WINDOW *win, int top, int bottom)
{
if (top < 0 || bottom >= win->maxy || bottom - top < 1)
return (ERR);
win->scr_t = top;
win->scr_b = bottom;
return (OK);
}
/*
* has_ic --
* Does the terminal have insert- and delete-character?
*/
bool
has_ic(void)
{
if (insert_character != NULL && delete_character != NULL)
return (TRUE);
else
return (FALSE);
}
/*
* has_ic --
* Does the terminal have insert- and delete-line?
*/
bool
has_il(void)
{
if (insert_line !=NULL && delete_line != NULL)
return (TRUE);
else
return (FALSE);
}
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