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* @Id: curs_clear.3x,v 1.11 2007/12/29 15:58:38 tom Exp @
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<H1>curs_clear 3x</H1>
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<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
<STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG> <STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>
</PRE>
<H2>NAME</H2><PRE>
<STRONG>erase</STRONG>, <STRONG>werase</STRONG>, <STRONG>clear</STRONG>, <STRONG>wclear</STRONG>, <STRONG>clrtobot</STRONG>, <STRONG>wclrtobot</STRONG>,
<STRONG>clrtoeol</STRONG>, <STRONG>wclrtoeol</STRONG> - clear all or part of a <STRONG>curses</STRONG> window
</PRE>
<H2>SYNOPSIS</H2><PRE>
<STRONG>#</STRONG> <STRONG>include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
<STRONG>int</STRONG> <STRONG>erase(void);</STRONG>
<STRONG>int</STRONG> <STRONG>werase(WINDOW</STRONG> <STRONG>*win);</STRONG>
<STRONG>int</STRONG> <STRONG>clear(void);</STRONG>
<STRONG>int</STRONG> <STRONG>wclear(WINDOW</STRONG> <STRONG>*win);</STRONG>
<STRONG>int</STRONG> <STRONG>clrtobot(void);</STRONG>
<STRONG>int</STRONG> <STRONG>wclrtobot(WINDOW</STRONG> <STRONG>*win);</STRONG>
<STRONG>int</STRONG> <STRONG>clrtoeol(void);</STRONG>
<STRONG>int</STRONG> <STRONG>wclrtoeol(WINDOW</STRONG> <STRONG>*win);</STRONG>
</PRE>
<H2>DESCRIPTION</H2><PRE>
The <STRONG>erase</STRONG> and <STRONG>werase</STRONG> routines copy blanks to every posi-
tion in the window, clearing the screen.
The <STRONG>clear</STRONG> and <STRONG>wclear</STRONG> routines are like <STRONG>erase</STRONG> and <STRONG>werase</STRONG>,
but they also call <STRONG>clearok</STRONG>, so that the screen is cleared
completely on the next call to <STRONG>wrefresh</STRONG> for that window
and repainted from scratch.
The <STRONG>clrtobot</STRONG> and <STRONG>wclrtobot</STRONG> routines erase from the cursor
to the end of screen. That is, they erase all lines below
the cursor in the window. Also, the current line to the
right of the cursor, inclusive, is erased.
The <STRONG>clrtoeol</STRONG> and <STRONG>wclrtoeol</STRONG> routines erase the current line
to the right of the cursor, inclusive, to the end of the
current line.
Blanks created by erasure have the current background ren-
dition (as set by <STRONG>wbkgdset</STRONG>) merged into them.
</PRE>
<H2>RETURN VALUE</H2><PRE>
All routines return the integer <STRONG>OK</STRONG> on success and <STRONG>ERR</STRONG> on
failure. The SVr4.0 manual says "or a non-negative inte-
ger if <STRONG>immedok</STRONG> is set", but this appears to be an error.
X/Open defines no error conditions. In this implementa-
tion, functions using a window pointer parameter return an
error if it is null.
</PRE>
<H2>NOTES</H2><PRE>
Note that <STRONG>erase</STRONG>, <STRONG>werase</STRONG>, <STRONG>clear</STRONG>, <STRONG>wclear</STRONG>, <STRONG>clrtobot</STRONG>, and <STRONG>clr-</STRONG>
<STRONG>toeol</STRONG> may be macros.
</PRE>
<H2>PORTABILITY</H2><PRE>
These functions are described in the XSI Curses standard,
Issue 4. The standard specifies that they return <STRONG>ERR</STRONG> on
failure, but specifies no error conditions.
Some historic curses implementations had, as an undocu-
mented feature, the ability to do the equivalent of
<STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touchwin(stdscr)</STRONG> or <STRONG>clear(std-</STRONG>
<STRONG>scr)</STRONG>. This will not work under ncurses.
This implementation, and others such as Solaris, sets the
current position to 0,0 after erasing via <STRONG>werase()</STRONG> and
<STRONG>wclear()</STRONG>. That fact is not documented in other implemen-
tations, and may not be true of implementations which were
not derived from SVr4 source.
Not obvious from the description, most implementations
clear the screen after <STRONG>wclear</STRONG> even for a subwindow or de-
rived window. If you do not want to clear the screen dur-
ing the next <STRONG>wrefresh</STRONG>, use <STRONG>werase</STRONG> instead.
</PRE>
<H2>SEE ALSO</H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
<STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>
</PRE>
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