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Background characters and attributes don't need to be kept per character
cell, as they are merged when characters are added.  Remove the per cell
storage and clarify the manual page.  Pointed out by ruibiao@.

/*	$NetBSD: erase.c,v 1.19 2006/01/15 11:43:54 jdc 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[] = "@(#)erase.c	8.2 (Berkeley) 5/4/94";
#else
__RCSID("$NetBSD: erase.c,v 1.19 2006/01/15 11:43:54 jdc Exp $");
#endif
#endif				/* not lint */

#include "curses.h"
#include "curses_private.h"

#ifndef _CURSES_USE_MACROS

/*
 * erase --
 *	Erases everything on stdscr.
 */
int
erase(void)
{
	return werase(stdscr);
}

#endif

/*
 * werase --
 *	Erases everything on the window.
 */
int
werase(WINDOW *win)
{

	int     y;
	__LDATA *sp, *end, *start;
	attr_t	attr;

#ifdef DEBUG
	__CTRACE("werase: (%p)\n", win);
#endif
	if (__using_color && win != curscr)
		attr = __default_color;
	else
		attr = 0;
	for (y = 0; y < win->maxy; y++) {
		start = win->lines[y]->line;
		end = &start[win->maxx];
		for (sp = start; sp < end; sp++)
			if (sp->ch != ' ' || sp->attr != 0) {
				sp->ch = ' ';
				sp->attr = attr;
			}
	}
	/*
	 * Mark the whole window as changed in case we have overlapping
	 * windows - this will result in the (intended) clearing of the
	 * screen over the area covered by the window. */
	__touchwin(win);
	wmove(win, 0, 0);
	return (OK);
}