1 /* $NetBSD: erase.c,v 1.38 2024/12/23 02:58:03 blymn 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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)erase.c 8.2 (Berkeley) 5/4/94";
36 #else
37 __RCSID("$NetBSD: erase.c,v 1.38 2024/12/23 02:58:03 blymn Exp $");
38 #endif
39 #endif /* not lint */
40
41 #include <stdlib.h>
42
43 #include "curses.h"
44 #include "curses_private.h"
45
46 #ifndef _CURSES_USE_MACROS
47
48 /*
49 * erase --
50 * Erases everything on stdscr.
51 */
52 int
erase(void)53 erase(void)
54 {
55 return werase(stdscr);
56 }
57
58 #endif
59
60 /*
61 * werase --
62 * Erases everything on the window.
63 */
64 int
werase(WINDOW * win)65 werase(WINDOW *win)
66 {
67 int y;
68 __LDATA *sp, *end, *start;
69 wchar_t bch;
70 attr_t battr;
71
72 __CTRACE(__CTRACE_ERASE, "werase: (%p)\n", win);
73
74 if (__predict_false(win == NULL))
75 return ERR;
76
77 bch = win->bch;
78 if (win != curscr)
79 battr = win->battr & __ATTRIBUTES;
80 else
81 battr = 0;
82
83 for (y = 0; y < win->maxy; y++) {
84 start = win->alines[y]->line;
85 end = &start[win->maxx];
86 for (sp = start; sp < end; sp++) {
87 if (!(__NEED_ERASE(sp, bch, battr)))
88 continue;
89
90 sp->ch = bch;
91 sp->cflags |= CA_BACKGROUND;
92 sp->cflags &= ~CA_CONTINUATION;
93 sp->attr = battr | (sp->attr & __ALTCHARSET);
94 #ifdef HAVE_WCHAR
95 if (_cursesi_copy_nsp(win->bnsp, sp) == ERR)
96 return ERR;
97 sp->wcols = 1;
98 #endif
99 }
100 }
101
102 /*
103 * Mark the whole window as changed in case we have overlapping
104 * windows - this will result in the (intended) clearing of the
105 * screen over the area covered by the window. */
106 __touchwin(win, 0);
107 wmove(win, 0, 0);
108 return OK;
109 }
110