erase.c revision 1.4 
1/*
2 * Copyright (c) 1981 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35/*static char sccsid[] = "from: @(#)erase.c	5.5 (Berkeley) 8/23/92";*/
36static char rcsid[] = "$Id: erase.c,v 1.4 1993/08/07 05:48:50 mycroft Exp $";
37#endif	/* not lint */
38
39#include <curses.h>
40
41/*
42 * werase --
43 *	Erases everything on the window.
44 */
45int
46werase(win)
47	register WINDOW *win;
48{
49
50	register int minx, y;
51	register char *sp, *end, *start, *maxx;
52
53#ifdef DEBUG
54	__TRACE("werase: (%0.2o)\n", win);
55#endif
56	for (y = 0; y < win->_maxy; y++) {
57		minx = _NOCHANGE;
58		start = win->_y[y];
59		end = &start[win->_maxx];
60		for (sp = start; sp < end; sp++)
61			if (*sp != ' ') {
62				maxx = sp;
63				if (minx == _NOCHANGE)
64					minx = sp - start;
65				*sp = ' ';
66			}
67		if (minx != _NOCHANGE)
68			touchline(win, y, minx, maxx - win->_y[y]);
69	}
70	win->_curx = win->_cury = 0;
71	return (OK);
72}
73