871cddc640
do checking, rather just scrolls the scrolling region so we shall follow suit. SUSv2 says what is happens when scrl is called with the cursor outside the scrolling is undefined so we should match ncurses. This fixes PR#51819 without forcing tin to use terminfo directly.
158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
/* $NetBSD: scroll.c,v 1.24 2017/02/10 06:25:28 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 1.24 2017/02/10 06:25:28 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, 0);
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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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