2a780e62ed
without refresh. If the window is not dirty but the window cursor position does not match curscr then move the cursor. This fixes the issues seen in PR lib/54263.
158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
/* $NetBSD: scroll.c,v 1.26 2019/06/09 07:40:14 blymn Exp $ */
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/*
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* Copyright (c) 1981, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)scroll.c 8.3 (Berkeley) 5/4/94";
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#else
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__RCSID("$NetBSD: scroll.c,v 1.26 2019/06/09 07:40:14 blymn Exp $");
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#endif
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#endif /* not lint */
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#include "curses.h"
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#include "curses_private.h"
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/*
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* scroll --
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* Scroll the window up a line.
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*/
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int
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scroll(WINDOW *win)
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{
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return wscrl(win, 1);
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}
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#ifndef _CURSES_USE_MACROS
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/*
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* scrl --
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* Scroll stdscr n lines - up if n is positive, down if n is negative.
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*/
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int
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scrl(int nlines)
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{
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return wscrl(stdscr, nlines);
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}
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/*
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* setscrreg --
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* Set the top and bottom of the scrolling region for stdscr.
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*/
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int
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setscrreg(int top, int bottom)
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{
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return wsetscrreg(stdscr, top, bottom);
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}
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#endif
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/*
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* wscrl --
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* Scroll a window n lines - up if n is positive, down if n is negative.
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*/
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int
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wscrl(WINDOW *win, int nlines)
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{
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int oy, ox;
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#ifdef DEBUG
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__CTRACE(__CTRACE_WINDOW, "wscrl: (%p) lines=%d\n", win, nlines);
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#endif
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if (!(win->flags & __SCROLLOK))
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return ERR;
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if (!nlines)
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return OK;
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getyx(win, oy, ox);
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#ifdef DEBUG
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__CTRACE(__CTRACE_WINDOW, "wscrl: y=%d\n", oy);
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#endif
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wmove(win, win->scr_t, 1);
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winsdelln(win, 0 - nlines);
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wmove(win, oy, ox);
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if (win == curscr) {
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__cputchar('\n');
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if (!__NONL)
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win->curx = 0;
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#ifdef DEBUG
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__CTRACE(__CTRACE_WINDOW, "scroll: win == curscr\n");
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#endif
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}
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return OK;
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}
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/*
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* wsetscrreg --
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* Set the top and bottom of the scrolling region for win.
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*/
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int
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wsetscrreg(WINDOW *win, int top, int bottom)
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{
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if (top < 0 || bottom >= win->maxy || bottom - top < 1)
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return ERR;
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win->scr_t = top;
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win->scr_b = bottom;
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return OK;
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}
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/*
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* has_ic --
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* Does the terminal have insert- and delete-character?
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*/
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bool
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has_ic(void)
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{
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if (insert_character != NULL && delete_character != NULL)
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return true;
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else
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return false;
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}
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/*
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* has_ic --
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* Does the terminal have insert- and delete-line?
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*/
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bool
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has_il(void)
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{
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if (insert_line !=NULL && delete_line != NULL)
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return true;
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else
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return false;
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}
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