erase.c revision 1.10 
1/*	$NetBSD: erase.c,v 1.10 1998/02/03 19:12:22 perry 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38#if 0
39static char sccsid[] = "@(#)erase.c	8.2 (Berkeley) 5/4/94";
40#else
41__RCSID("$NetBSD: erase.c,v 1.10 1998/02/03 19:12:22 perry Exp $");
42#endif
43#endif	/* not lint */
44
45#include "curses.h"
46
47/*
48 * werase --
49 *	Erases everything on the window.
50 */
51int
52werase(win)
53	WINDOW *win;
54{
55
56	int minx, y;
57	__LDATA *sp, *end, *start, *maxx;
58
59#ifdef DEBUG
60	__CTRACE("werase: (%0.2o)\n", win);
61#endif
62#ifdef __GNUC__
63	maxx = NULL;		/* XXX gcc -Wuninitialized */
64#endif
65	for (y = 0; y < win->maxy; y++) {
66		minx = -1;
67		start = win->lines[y]->line;
68		end = &start[win->maxx];
69		for (sp = start; sp < end; sp++)
70			if (sp->ch != ' ' || sp->attr != 0) {
71				maxx = sp;
72				if (minx == -1)
73					minx = sp - start;
74				sp->ch = ' ';
75				sp->attr = 0;
76			}
77		if (minx != -1)
78			__touchline(win, y, minx, maxx - win->lines[y]->line,
79			   0);
80	}
81	wmove(win, 0, 0);
82	return (OK);
83}
84