erase.c revision 1.34 
1/*	$NetBSD: erase.c,v 1.34 2022/01/25 03:05:06 blymn Exp $	*/
2
3/*
4 * Copyright (c) 1981, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)erase.c	8.2 (Berkeley) 5/4/94";
36#else
37__RCSID("$NetBSD: erase.c,v 1.34 2022/01/25 03:05:06 blymn Exp $");
38#endif
39#endif				/* not lint */
40
41#include <stdlib.h>
42
43#include "curses.h"
44#include "curses_private.h"
45
46#ifndef _CURSES_USE_MACROS
47
48/*
49 * erase --
50 *	Erases everything on stdscr.
51 */
52int
53erase(void)
54{
55	return werase(stdscr);
56}
57
58#endif
59
60/*
61 * werase --
62 *	Erases everything on the window.
63 */
64int
65werase(WINDOW *win)
66{
67	int     y;
68	__LDATA *sp, *end, *start;
69	wchar_t	bch;
70	attr_t	battr;
71
72	__CTRACE(__CTRACE_ERASE, "werase: (%p)\n", win);
73#ifdef HAVE_WCHAR
74	bch = (wchar_t)btowc((int)win->bch);
75#else
76	bch = win->bch;
77#endif
78	if (win != curscr)
79		battr = win->battr & __ATTRIBUTES;
80	else
81		battr = 0;
82
83	for (y = 0; y < win->maxy; y++) {
84		start = win->alines[y]->line;
85		end = &start[win->maxx];
86		for (sp = start; sp < end; sp++) {
87			if (!(__NEED_ERASE(sp, bch, battr)))
88				continue;
89
90			sp->ch = bch;
91			sp->attr = battr | (sp->attr & __ALTCHARSET);
92#ifdef HAVE_WCHAR
93			if (_cursesi_copy_nsp(win->bnsp, sp) == ERR)
94				return ERR;
95			sp->wcols = 1;
96#endif
97		}
98	}
99
100	/*
101	 * Mark the whole window as changed in case we have overlapping
102	 * windows - this will result in the (intended) clearing of the
103	 * screen over the area covered by the window. */
104	__touchwin(win);
105	wmove(win, 0, 0);
106	return OK;
107}
108