contrib/ncurses/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 <STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>                                     <STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE>
  49 <H2>NAME</H2><PRE>
  50        <STRONG>erase</STRONG>,  <STRONG>werase</STRONG>,  <STRONG>clear</STRONG>,  <STRONG>wclear</STRONG>, <STRONG>clrtobot</STRONG>, <STRONG>wclrtobot</STRONG>, <STRONG>clr-</STRONG>
  51        <STRONG>toeol</STRONG>, <STRONG>wclrtoeol</STRONG> - clear all or part of a <STRONG>curses</STRONG> window
  52
  53
  54 </PRE>
  55 <H2>SYNOPSIS</H2><PRE>
  56        <STRONG>#</STRONG> <STRONG>include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  57
  58        <STRONG>int</STRONG> <STRONG>erase(void);</STRONG>
  59        <STRONG>int</STRONG> <STRONG>werase(WINDOW</STRONG> <STRONG>*win);</STRONG>
  60        <STRONG>int</STRONG> <STRONG>clear(void);</STRONG>
  61        <STRONG>int</STRONG> <STRONG>wclear(WINDOW</STRONG> <STRONG>*win);</STRONG>
  62        <STRONG>int</STRONG> <STRONG>clrtobot(void);</STRONG>
  63        <STRONG>int</STRONG> <STRONG>wclrtobot(WINDOW</STRONG> <STRONG>*win);</STRONG>
  64        <STRONG>int</STRONG> <STRONG>clrtoeol(void);</STRONG>
  65        <STRONG>int</STRONG> <STRONG>wclrtoeol(WINDOW</STRONG> <STRONG>*win);</STRONG>
  66
  67
  68 </PRE>
  69 <H2>DESCRIPTION</H2><PRE>
  70        The <STRONG>erase</STRONG> and <STRONG>werase</STRONG> routines copy blanks to  every  posi-
  71        tion in the window, clearing the screen.
  72
  73        The  <STRONG>clear</STRONG>  and <STRONG>wclear</STRONG> routines are like <STRONG>erase</STRONG> and <STRONG>werase</STRONG>,
  74        but they also call <STRONG>clearok</STRONG>, so that the screen is  cleared
  75        completely  on  the  next call to <STRONG>wrefresh</STRONG> for that window
  76        and repainted from scratch.
  77
  78        The <STRONG>clrtobot</STRONG> and <STRONG>wclrtobot</STRONG> routines erase from the  cursor
  79        to the end of screen.  That is, they erase all lines below
  80        the cursor in the window.  Also, the current line  to  the
  81        right of the cursor, inclusive, is erased.
  82
  83        The <STRONG>clrtoeol</STRONG> and <STRONG>wclrtoeol</STRONG> routines erase the current line
  84        to the right of the cursor, inclusive, to the end  of  the
  85        current line.
  86
  87        Blanks created by erasure have the current background ren-
  88        dition (as set by <STRONG>wbkgdset</STRONG>) merged into them.
  89
  90
  91 </PRE>
  92 <H2>RETURN VALUE</H2><PRE>
  93        All routines return the integer  <STRONG>OK</STRONG>.   The  SVr4.0  manual
  94        says  "or  a  non-negative integer if <STRONG>immedok</STRONG> is set", but
  95        this appears to be an error.
  96
  97
  98 </PRE>
  99 <H2>NOTES</H2><PRE>
 100        Note that <STRONG>erase</STRONG>, <STRONG>werase</STRONG>, <STRONG>clear</STRONG>, <STRONG>wclear</STRONG>, <STRONG>clrtobot</STRONG>, and <STRONG>clr-</STRONG>
 101        <STRONG>toeol</STRONG> may be macros.
 102
 103
 104 </PRE>
 105 <H2>PORTABILITY</H2><PRE>
 106        These  functions are described in the XSI Curses standard,
 107        Issue 4.  The standard specifies that they return  <STRONG>ERR</STRONG>  on
 108        failure, but specifies no error conditions.
 109
 110        Some  historic  curses  implementations had, as an undocu-
 111        mented feature,  the  ability  to  do  the  equivalent  of
 112        <STRONG>clearok(...,</STRONG>  <STRONG>1)</STRONG>  by saying <STRONG>touchwin(stdscr)</STRONG> or <STRONG>clear(std-</STRONG>
 113        <STRONG>scr)</STRONG>.  This will not work under ncurses.
 114
 115
 116 </PRE>
 117 <H2>SEE ALSO</H2><PRE>
 118        <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>
 119
 120
 121
 122                                                    <STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>
 123 </PRE>
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