erase.c revision 1.22 
1/*	$NetBSD: erase.c,v 1.22 2007/01/21 13:25:36 jdc 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 1.22 2007/01/21 13:25:36 jdc Exp $");
38#endif
39#endif				/* not lint */
40
41#include "curses.h"
42#include "curses_private.h"
43
44#ifndef _CURSES_USE_MACROS
45
46/*
47 * erase --
48 *	Erases everything on stdscr.
49 */
50int
51erase(void)
52{
53	return werase(stdscr);
54}
55
56#endif
57
58/*
59 * werase --
60 *	Erases everything on the window.
61 */
62int
63werase(WINDOW *win)
64{
65
66	int     y;
67	__LDATA *sp, *end, *start;
68	attr_t	attr;
69
70#ifdef DEBUG
71	__CTRACE(__CTRACE_ERASE, "werase: (%p)\n", win);
72#endif
73	if (__using_color && win != curscr)
74		attr = win->battr & __COLOR;
75	else
76		attr = 0;
77	for (y = 0; y < win->maxy; y++) {
78		start = win->lines[y]->line;
79		end = &start[win->maxx];
80		for (sp = start; sp < end; sp++)
81			if (sp->ch != win->bch || sp->attr != 0) {
82				sp->ch = win->bch;
83				sp->attr = attr;
84			}
85	}
86	/*
87	 * Mark the whole window as changed in case we have overlapping
88	 * windows - this will result in the (intended) clearing of the
89	 * screen over the area covered by the window. */
90	__touchwin(win);
91	wmove(win, 0, 0);
92	return (OK);
93}
94