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

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  29   * Author: Thomas E. Dickey 1996-on
  30   * @Id: resizeterm.3x,v 1.19 2015/06/06 23:38:18 tom Exp @
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  42 <H1 class="no-header">resizeterm 3x</H1>
  43 <PRE>
  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><a name="h2-NAME">NAME</a></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><a name="h2-SYNOPSIS">SYNOPSIS</a></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><a name="h2-DESCRIPTION">DESCRIPTION</a></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).
  70
  71
  72 </PRE>
  73 <H3><a name="h3-resizeterm">resizeterm</a></H3><PRE>
  74        The  function  <STRONG>resizeterm</STRONG> resizes the standard and current
  75        windows to the specified  dimensions,  and  adjusts  other
  76        bookkeeping  data  used by the <STRONG>ncurses</STRONG> library that record
  77        the window dimensions such as the  <STRONG>LINES</STRONG>  and  <STRONG>COLS</STRONG>  vari-
  78        ables.
  79
  80
  81 </PRE>
  82 <H3><a name="h3-resize_term">resize_term</a></H3><PRE>
  83        Most   of   the   work  is  done  by  the  inner  function
  84        <STRONG>resize_term</STRONG>.  The outer function <STRONG>resizeterm</STRONG> adds bookkeep-
  85        ing  for the SIGWINCH handler.  When resizing the windows,
  86        <STRONG>resize_term</STRONG> blank-fills the areas that are extended.   The
  87        calling application should fill in these areas with appro-
  88        priate data.  The <STRONG>resize_term</STRONG> function attempts to  resize
  89        all  windows.   However,  due to the calling convention of
  90        pads, it is not possible to  resize  these  without  addi-
  91        tional interaction with the application.
  92
  93
  94 </PRE>
  95 <H3><a name="h3-is_term_resized">is_term_resized</a></H3><PRE>
  96        A  support  function  <STRONG>is_term_resized</STRONG>  is provided so that
  97        applications can check if the <STRONG>resize_term</STRONG>  function  would
  98        modify the window structures.  It returns <STRONG>TRUE</STRONG> if the win-
  99        dows would be modified, and <STRONG>FALSE</STRONG> otherwise.
 100
 101
 102 </PRE>
 103 <H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
 104        Except as noted, these functions return  the  integer  <STRONG>ERR</STRONG>
 105        upon  failure and <STRONG>OK</STRONG> on success.  They will fail if either
 106        of the dimensions are less than or equal to zero, or if an
 107        error occurs while (re)allocating memory for the windows.
 108
 109
 110 </PRE>
 111 <H2><a name="h2-NOTES">NOTES</a></H2><PRE>
 112        While these functions are intended to be used to support a
 113        signal handler (i.e., for SIGWINCH), care should be  taken
 114        to  avoid invoking them in a context where <STRONG>malloc</STRONG> or <STRONG>real-</STRONG>
 115        <STRONG>loc</STRONG> may have been interrupted, since it uses  those  func-
 116        tions.
 117
 118        If  ncurses  is configured to supply its own SIGWINCH han-
 119        dler, the <STRONG>resizeterm</STRONG> function <STRONG>ungetch</STRONG>'s a <STRONG>KEY_RESIZE</STRONG> which
 120        will  be  read on the next call to <STRONG>getch</STRONG>.  This is used to
 121        alert an application that the screen size has changed, and
 122        that  it should repaint special features such as pads that
 123        cannot be done automatically.
 124
 125        If the environment variables <STRONG>LINES</STRONG>  or  <STRONG>COLUMNS</STRONG>  are  set,
 126        this  overrides  the  library's  use  of  the  window size
 127        obtained from the operating system.  Thus, even if a  SIG-
 128        WINCH is received, no screen size change may be recorded.
 129
 130
 131 </PRE>
 132 <H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
 133        <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>, <STRONG><A HREF="wresize.3x.html">wresize(3x)</A></STRONG>.
 134
 135
 136 </PRE>
 137 <H2><a name="h2-AUTHOR">AUTHOR</a></H2><PRE>
 138        Thomas Dickey (from an equivalent function written in 1988
 139        for BSD curses).
 140
 141
 142
 143                                                          <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
 144 </PRE>
 145 <div class="nav">
 146 <ul>
 147 <li><a href="#h2-NAME">NAME</a></li>
 148 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
 149 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
 150 <ul>
 151 <li><a href="#h3-resizeterm">resizeterm</a></li>
 152 <li><a href="#h3-resize_term">resize_term</a></li>
 153 <li><a href="#h3-is_term_resized">is_term_resized</a></li>
 154 </ul>
 155 </li>
 156 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
 157 <li><a href="#h2-NOTES">NOTES</a></li>
 158 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
 159 <li><a href="#h2-AUTHOR">AUTHOR</a></li>
 160 </ul>
 161 </div>
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