1 /*
2 * Copyright (c) 1981, 1993, 1994
3 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef lint
31 static char sccsid[] = "@(#)erase.c 8.2 (Berkeley) 5/4/94";
32 #endif /* not lint */
33
34 #include "curses.h"
35
36 /*
37 * werase --
38 * Erases everything on the window.
39 */
40 int
werase(win)41 werase(win)
42 register WINDOW *win;
43 {
44
45 register int minx, y;
46 register __LDATA *sp, *end, *start, *maxx;
47
48 #ifdef DEBUG
49 __CTRACE("werase: (%0.2o)\n", win);
50 #endif
51 for (y = 0; y < win->maxy; y++) {
52 minx = -1;
53 start = win->lines[y]->line;
54 end = &start[win->maxx];
55 for (sp = start; sp < end; sp++)
56 if (sp->ch != ' ' || sp->attr != 0) {
57 maxx = sp;
58 if (minx == -1)
59 minx = sp - start;
60 sp->ch = ' ';
61 sp->attr = 0;
62 }
63 if (minx != -1)
64 __touchline(win, y, minx, maxx - win->lines[y]->line,
65 0);
66 }
67 return (OK);
68 }
69