116 lines
4.8 KiB
Plaintext
116 lines
4.8 KiB
Plaintext
.\"***************************************************************************
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.\" Copyright (c) 1998,2005 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: curs_clear.3x,v 1.10 2005/10/01 19:34:43 tom Exp $
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.TH curs_clear 3X ""
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.na
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.hy 0
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.SH NAME
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\fBerase\fR,
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\fBwerase\fR,
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\fBclear\fR,
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\fBwclear\fR,
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\fBclrtobot\fR,
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\fBwclrtobot\fR,
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\fBclrtoeol\fR,
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\fBwclrtoeol\fR - clear all or part of a \fBcurses\fR window
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.ad
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.hy
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.SH SYNOPSIS
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\fB# include <curses.h>\fR
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.sp
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\fBint erase(void);\fR
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.br
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\fBint werase(WINDOW *win);\fR
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.br
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\fBint clear(void);\fR
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.br
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\fBint wclear(WINDOW *win);\fR
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.br
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\fBint clrtobot(void);\fR
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.br
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\fBint wclrtobot(WINDOW *win);\fR
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.br
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\fBint clrtoeol(void);\fR
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.br
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\fBint wclrtoeol(WINDOW *win);\fR
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.br
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.SH DESCRIPTION
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The \fBerase\fR and \fBwerase\fR routines copy blanks to every
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position in the window, clearing the screen.
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.PP
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The \fBclear\fR and \fBwclear\fR routines are like \fBerase\fR and
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\fBwerase\fR, but they also call \fBclearok\fR, so that the screen is
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cleared completely on the next call to \fBwrefresh\fR for that window
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and repainted from scratch.
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.PP
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The \fBclrtobot\fR and \fBwclrtobot\fR routines erase from the cursor to the
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end of screen. That is, they erase all lines below the cursor in the window.
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Also, the current line to the right of the cursor, inclusive, is erased.
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.PP
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The \fBclrtoeol\fR and \fBwclrtoeol\fR routines erase the current line
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to the right of the cursor, inclusive, to the end of the current line.
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.PP
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Blanks created by erasure have the current background rendition (as set
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by \fBwbkgdset\fR) merged into them.
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.SH RETURN VALUE
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All routines return the integer \fBOK\fR on success and \fBERR\fP on failure.
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The SVr4.0 manual says "or a
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non-negative integer if \fBimmedok\fR is set", but this appears to be an error.
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.PP
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X/Open defines no error conditions.
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In this implementation,
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functions using a window pointer parameter return an error if it is null.
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.SH NOTES
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Note that \fBerase\fR, \fBwerase\fR, \fBclear\fR, \fBwclear\fR,
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\fBclrtobot\fR, and \fBclrtoeol\fR may be macros.
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.SH PORTABILITY
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These functions are described in the XSI Curses standard, Issue 4. The
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standard specifies that they return \fBERR\fR on failure, but specifies no
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error conditions.
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.PP
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Some historic curses implementations had, as an undocumented feature, the
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ability to do the equivalent of \fBclearok(..., 1)\fR by saying
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\fBtouchwin(stdscr)\fR or \fBclear(stdscr)\fR. This will not work under
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ncurses.
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.PP
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This implementation, and others such as Solaris,
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sets the current position to 0,0 after erasing
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via \fBwerase()\fP and \fBwclear()\fP.
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That fact is not documented in other implementations,
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and may not be true of implementations
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which were not derived from SVr4 source.
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.SH SEE ALSO
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\fBcurses\fR(3X), \fBcurs_outopts\fR(3X), \fBcurs_refresh\fR(3X)
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.\"#
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.\"# The following sets edit modes for GNU EMACS
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.\"# Local Variables:
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.\"# mode:nroff
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.\"# fill-column:79
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.\"# End:
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