NetBSD/lib/libcurses/erase.c

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/* $NetBSD: erase.c,v 1.17 2003/08/07 16:44:21 agc Exp $ */
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/*
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* Copyright (c) 1981, 1993, 1994
* The Regents of the University of California. All rights reserved.
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*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)erase.c 8.2 (Berkeley) 5/4/94";
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#else
__RCSID("$NetBSD: erase.c,v 1.17 2003/08/07 16:44:21 agc Exp $");
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#endif
#endif /* not lint */
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#include "curses.h"
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#include "curses_private.h"
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#ifndef _CURSES_USE_MACROS
/*
* erase --
* Erases everything on stdscr.
*/
int
erase(void)
{
return werase(stdscr);
}
#endif
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/*
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* werase --
* Erases everything on the window.
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*/
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int
werase(WINDOW *win)
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{
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int minx, y;
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__LDATA *sp, *end, *start, *maxx;
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#ifdef DEBUG
__CTRACE("werase: (%p)\n", win);
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#endif
#ifdef __GNUC__
maxx = NULL; /* XXX gcc -Wuninitialized */
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#endif
for (y = 0; y < win->maxy; y++) {
minx = -1;
start = win->lines[y]->line;
end = &start[win->maxx];
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for (sp = start; sp < end; sp++)
if (sp->ch != ' ' || sp->attr != 0 ||
sp->bch != win->bch || sp->battr != win->battr) {
maxx = sp;
if (minx == -1)
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minx = sp - start;
sp->ch = ' ';
sp->bch = win->bch;
sp->attr = 0;
sp->battr = win->battr;
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}
if (minx != -1)
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__touchline(win, y, minx, maxx - win->lines[y]->line);
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}
wmove(win, 0, 0);
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return (OK);
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}