release/src/router/libncurses/doc/html/man/resizeterm.3x.html

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  30   * Author: Thomas E. Dickey 1996-2005
  31   * @Id: resizeterm.3x,v 1.14 2010/12/04 18:38:55 tom Exp @
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  40 <H1>resizeterm 3x</H1>
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  42 <PRE>
  43 <!-- Manpage converted by man2html 3.0.1 -->
  44 <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>                                           <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
  45
  46
  47
  48
  49 </PRE>
  50 <H2>NAME</H2><PRE>
  51        <STRONG>is_term_resized</STRONG>,  <STRONG>resize_term</STRONG>,  <STRONG>resizeterm</STRONG>  -  change  the
  52        curses terminal size
  53
  54
  55 </PRE>
  56 <H2>SYNOPSIS</H2><PRE>
  57        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  58
  59        <STRONG>bool</STRONG> <STRONG>is_term_resized(int</STRONG> <STRONG>lines,</STRONG> <STRONG>int</STRONG> <STRONG>columns);</STRONG>
  60        <STRONG>int</STRONG> <STRONG>resize_term(int</STRONG> <STRONG>lines,</STRONG> <STRONG>int</STRONG> <STRONG>columns);</STRONG>
  61        <STRONG>int</STRONG> <STRONG>resizeterm(int</STRONG> <STRONG>lines,</STRONG> <STRONG>int</STRONG> <STRONG>columns);</STRONG>
  62
  63
  64 </PRE>
  65 <H2>DESCRIPTION</H2><PRE>
  66        This is an extension to the curses library.   It  provides
  67        callers  with  a hook into the <STRONG>ncurses</STRONG> data to resize win-
  68        dows, primarily for use by programs running in an X Window
  69        terminal  (e.g.,  xterm).  The function <STRONG>resizeterm</STRONG> resizes
  70        the standard and current windows to the  specified  dimen-
  71        sions,  and  adjusts  other  bookkeeping  data used by the
  72        <STRONG>ncurses</STRONG> library that record the window dimensions.
  73
  74        Most  of  the  work  is  done  by   the   inner   function
  75        <STRONG>resize_term</STRONG>.  The outer function <STRONG>resizeterm</STRONG> adds bookkeep-
  76        ing for the SIGWINCH handler.  When resizing the  windows,
  77        <STRONG>resize_term</STRONG>  blank-fills the areas that are extended.  The
  78        calling application should fill in these areas with appro-
  79        priate  data.  The <STRONG>resize_term</STRONG> function attempts to resize
  80        all windows.  However, due to the  calling  convention  of
  81        pads,  it  is  not  possible to resize these without addi-
  82        tional interaction with the application.
  83
  84        A support function <STRONG>is_term_resized</STRONG>  is  provided  so  that
  85        applications  can  check if the <STRONG>resize_term</STRONG> function would
  86        modify the window structures.  It returns TRUE if the win-
  87        dows would be modified, and FALSE otherwise.
  88
  89
  90 </PRE>
  91 <H2>RETURN VALUE</H2><PRE>
  92        Except  as  notes,  these  function return the integer <STRONG>ERR</STRONG>
  93        upon failure and <STRONG>OK</STRONG> on success.  They will fail if  either
  94        of the dimensions are less than or equal to zero, or if an
  95        error occurs while (re)allocating memory for the windows.
  96
  97
  98 </PRE>
  99 <H2>NOTES</H2><PRE>
 100        While these functions are intended to be used to support a
 101        signal  handler (i.e., for SIGWINCH), care should be taken
 102        to avoid invoking them in a context where <STRONG>malloc</STRONG> or  <STRONG>real-</STRONG>
 103        <STRONG>loc</STRONG>  may  have been interrupted, since it uses those func-
 104        tions.
 105
 106        If ncurses is configured to supply its own  SIGWINCH  han-
 107        dler, the <STRONG>resizeterm</STRONG> function ungetch's a <STRONG>KEY_RESIZE</STRONG> which
 108        will be read on the next call to <STRONG>getch</STRONG>.  This is  used  to
 109        alert an application that the screen size has changed, and
 110        that it should repaint special features such as pads  that
 111        cannot be done automatically.
 112
 113        If  the  environment  variables  <STRONG>LINES</STRONG> or <STRONG>COLUMNS</STRONG> are set,
 114        this overrides  the  library's  use  of  the  window  size
 115        obtained  from the operating system.  Thus, even if a SIG-
 116        WINCH is received, no screen size change may be  recorded.
 117        In that case, no <STRONG>KEY_RESIZE</STRONG> is queued for the next call to
 118        <STRONG>getch</STRONG>; an <STRONG>ERR</STRONG> will be returned instead.
 119
 120
 121 </PRE>
 122 <H2>SEE ALSO</H2><PRE>
 123        <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>, <STRONG><A HREF="wresize.3x.html">wresize(3x)</A></STRONG>.
 124
 125
 126 </PRE>
 127 <H2>AUTHOR</H2><PRE>
 128        Thomas Dickey (from an equivalent function written in 1988
 129        for BSD curses).
 130
 131
 132
 133                                                          <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
 134 </PRE>
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