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Upgrades the standard NetBSD curses library to provide some
of the SYSV curses facilities.  The added features are the collapsing
of arrow and function keysequences (as defined by termcap for the
terminal) into symbolic code returns thus relieving the application of
recognising multi-character key sequences.  Other features are the
capability to perform a timed wait for a key (good for when you are
not sure if there is a keypress ready or not) and the capability for
turning off the inter-key timeout when assembling multi-character
function keys.

this work was done by Julian Coleman <J.D.Coleman@newcastle.ac.uk>
and blymn@baea.com.au (Brett Lymn).  i'm just integrating it.  thanks
HEAPS guys!

/*	$NetBSD: erase.c,v 1.11 1999/04/13 14:08:18 mrg 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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 1.11 1999/04/13 14:08:18 mrg Exp $");
#endif
#endif				/* not lint */

#include "curses.h"

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

	int     minx, y;
	__LDATA *sp, *end, *start, *maxx;

#ifdef DEBUG
	__CTRACE("werase: (%0.2o)\n", win);
#endif
#ifdef __GNUC__
	maxx = NULL;		/* XXX gcc -Wuninitialized */
#endif
	for (y = 0; y < win->maxy; y++) {
		minx = -1;
		start = win->lines[y]->line;
		end = &start[win->maxx];
		for (sp = start; sp < end; sp++)
			if (sp->ch != ' ' || sp->attr != 0) {
				maxx = sp;
				if (minx == -1)
					minx = sp - start;
				sp->ch = ' ';
				sp->attr = 0;
			}
		if (minx != -1)
			__touchline(win, y, minx, maxx - win->lines[y]->line,
			    0);
	}
	wmove(win, 0, 0);
	return (OK);
}