1 /*
2 * Copyright (c) 1981, 1993
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. 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[] = "@(#)erase.c 8.1 (Berkeley) 6/4/93";
36 #endif /* not lint */
37
38 #include <curses.h>
39
40 /*
41 * werase --
42 * Erases everything on the window.
43 */
44 int
werase(win)45 werase(win)
46 register WINDOW *win;
47 {
48
49 register int minx, y;
50 register __LDATA *sp, *end, *start, *maxx;
51
52 #ifdef DEBUG
53 __CTRACE("werase: (%0.2o)\n", win);
54 #endif
55 for (y = 0; y < win->maxy; y++) {
56 minx = -1;
57 start = win->lines[y]->line;
58 end = &start[win->maxx];
59 for (sp = start; sp < end; sp++)
60 if (sp->ch != ' ' || sp->attr != 0) {
61 maxx = sp;
62 if (minx == -1)
63 minx = sp - start;
64 sp->ch = ' ';
65 sp->attr = 0;
66 }
67 if (minx != -1)
68 __touchline(win, y, minx, maxx - win->lines[y]->line,
69 0);
70 }
71 return (OK);
72 }
73