doc/html/man/curs_clear.3x.html

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  34 <TITLE>curs_clear 3x</TITLE>
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  39 <H1>curs_clear 3x</H1>
  40 <HR>
  41 <PRE>
  42 <!-- Manpage converted by man2html 3.0.1 -->
  43
  44 </PRE>
  45 <H2>NAME</H2><PRE>
  46        <STRONG>erase</STRONG>,  <STRONG>werase</STRONG>,  <STRONG>clear</STRONG>,  <STRONG>wclear</STRONG>, <STRONG>clrtobot</STRONG>, <STRONG>wclrtobot</STRONG>, <STRONG>clr-</STRONG>
  47        <STRONG>toeol</STRONG>, <STRONG>wclrtoeol</STRONG> - clear all or part of a <STRONG>curses</STRONG> window
  48
  49
  50 </PRE>
  51 <H2>SYNOPSIS</H2><PRE>
  52        <STRONG>#</STRONG> <STRONG>include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  53
  54        <STRONG>int</STRONG> <STRONG>erase(void);</STRONG>
  55        <STRONG>int</STRONG> <STRONG>werase(WINDOW</STRONG> <STRONG>*win);</STRONG>
  56        <STRONG>int</STRONG> <STRONG>clear(void);</STRONG>
  57        <STRONG>int</STRONG> <STRONG>wclear(WINDOW</STRONG> <STRONG>*win);</STRONG>
  58        <STRONG>int</STRONG> <STRONG>clrtobot(void);</STRONG>
  59        <STRONG>int</STRONG> <STRONG>wclrtobot(WINDOW</STRONG> <STRONG>*win);</STRONG>
  60        <STRONG>int</STRONG> <STRONG>clrtoeol(void);</STRONG>
  61        <STRONG>int</STRONG> <STRONG>wclrtoeol(WINDOW</STRONG> <STRONG>*win);</STRONG>
  62
  63
  64 </PRE>
  65 <H2>DESCRIPTION</H2><PRE>
  66        The <STRONG>erase</STRONG> and <STRONG>werase</STRONG> routines copy blanks to  every  posi-
  67        tion in the window, clearing the screen.
  68
  69        The  <STRONG>clear</STRONG>  and <STRONG>wclear</STRONG> routines are like <STRONG>erase</STRONG> and <STRONG>werase</STRONG>,
  70        but they also call <STRONG>clearok</STRONG>, so that the screen is  cleared
  71        completely  on  the  next call to <STRONG>wrefresh</STRONG> for that window
  72        and repainted from scratch.
  73
  74        The <STRONG>clrtobot</STRONG> and <STRONG>wclrtobot</STRONG> routines erase from the  cursor
  75        to the end of screen.  That is, they erase all lines below
  76        the cursor in the window.  Also, the current line  to  the
  77        right of the cursor, inclusive, is erased.
  78
  79        The <STRONG>clrtoeol</STRONG> and <STRONG>wclrtoeol</STRONG> routines erase the current line
  80        to the right of the cursor, inclusive, to the end  of  the
  81        current line.
  82
  83        Blanks created by erasure have the current background ren-
  84        dition (as set by <STRONG>wbkgdset</STRONG>) merged into them.
  85
  86
  87 </PRE>
  88 <H2>RETURN VALUE</H2><PRE>
  89        All routines return the integer  <STRONG>OK</STRONG>.   The  SVr4.0  manual
  90        says  "or  a  non-negative integer if <STRONG>immedok</STRONG> is set", but
  91        this appears to be an error.
  92
  93
  94 </PRE>
  95 <H2>NOTES</H2><PRE>
  96        Note that <STRONG>erase</STRONG>, <STRONG>werase</STRONG>, <STRONG>clear</STRONG>, <STRONG>wclear</STRONG>, <STRONG>clrtobot</STRONG>, and <STRONG>clr-</STRONG>
  97        <STRONG>toeol</STRONG> may be macros.
  98
  99
 100 </PRE>
 101 <H2>PORTABILITY</H2><PRE>
 102        These  functions are described in the XSI Curses standard,
 103        Issue 4.  The standard specifies that they return  <STRONG>ERR</STRONG>  on
 104        failure, but specifies no error conditions.
 105
 106        Some  historic  curses  implementations had, as an undocu-
 107        mented feature,  the  ability  to  do  the  equivalent  of
 108        <STRONG>clearok(...,</STRONG>    <STRONG>1)</STRONG>    by    saying   <STRONG>touchwin(stdscr)</STRONG>   or
 109        <STRONG>clear(stdscr)</STRONG>.  This will not work under ncurses.
 110
 111
 112 </PRE>
 113 <H2>SEE ALSO</H2><PRE>
 114        <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>
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 165 </PRE>
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