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* Author: Thomas E. Dickey 1996-2005
* @Id: resizeterm.3x,v 1.14 2010/12/04 18:38:55 tom Exp @
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<H1>resizeterm 3x</H1>
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<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
<STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG> <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
</PRE>
<H2>NAME</H2><PRE>
<STRONG>is_term_resized</STRONG>, <STRONG>resize_term</STRONG>, <STRONG>resizeterm</STRONG> - change the
curses terminal size
</PRE>
<H2>SYNOPSIS</H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>bool</STRONG> <STRONG>is_term_resized(int</STRONG> <STRONG>lines,</STRONG> <STRONG>int</STRONG> <STRONG>columns);</STRONG>
<STRONG>int</STRONG> <STRONG>resize_term(int</STRONG> <STRONG>lines,</STRONG> <STRONG>int</STRONG> <STRONG>columns);</STRONG>
<STRONG>int</STRONG> <STRONG>resizeterm(int</STRONG> <STRONG>lines,</STRONG> <STRONG>int</STRONG> <STRONG>columns);</STRONG>
</PRE>
<H2>DESCRIPTION</H2><PRE>
This is an extension to the curses library. It provides
callers with a hook into the <STRONG>ncurses</STRONG> data to resize win-
dows, primarily for use by programs running in an X Window
terminal (e.g., xterm). The function <STRONG>resizeterm</STRONG> resizes
the standard and current windows to the specified dimen-
sions, and adjusts other bookkeeping data used by the
<STRONG>ncurses</STRONG> library that record the window dimensions.
Most of the work is done by the inner function
<STRONG>resize_term</STRONG>. The outer function <STRONG>resizeterm</STRONG> adds bookkeep-
ing for the SIGWINCH handler. When resizing the windows,
<STRONG>resize_term</STRONG> blank-fills the areas that are extended. The
calling application should fill in these areas with appro-
priate data. The <STRONG>resize_term</STRONG> function attempts to resize
all windows. However, due to the calling convention of
pads, it is not possible to resize these without addi-
tional interaction with the application.
A support function <STRONG>is_term_resized</STRONG> is provided so that
applications can check if the <STRONG>resize_term</STRONG> function would
modify the window structures. It returns TRUE if the win-
dows would be modified, and FALSE otherwise.
</PRE>
<H2>RETURN VALUE</H2><PRE>
Except as notes, these function return the integer <STRONG>ERR</STRONG>
upon failure and <STRONG>OK</STRONG> on success. They will fail if either
of the dimensions are less than or equal to zero, or if an
error occurs while (re)allocating memory for the windows.
</PRE>
<H2>NOTES</H2><PRE>
While these functions are intended to be used to support a
signal handler (i.e., for SIGWINCH), care should be taken
to avoid invoking them in a context where <STRONG>malloc</STRONG> or <STRONG>real-</STRONG>
<STRONG>loc</STRONG> may have been interrupted, since it uses those func-
tions.
If ncurses is configured to supply its own SIGWINCH han-
dler, the <STRONG>resizeterm</STRONG> function ungetch's a <STRONG>KEY_RESIZE</STRONG> which
will be read on the next call to <STRONG>getch</STRONG>. This is used to
alert an application that the screen size has changed, and
that it should repaint special features such as pads that
cannot be done automatically.
If the environment variables <STRONG>LINES</STRONG> or <STRONG>COLUMNS</STRONG> are set,
this overrides the library's use of the window size
obtained from the operating system. Thus, even if a SIG-
WINCH is received, no screen size change may be recorded.
In that case, no <STRONG>KEY_RESIZE</STRONG> is queued for the next call to
<STRONG>getch</STRONG>; an <STRONG>ERR</STRONG> will be returned instead.
</PRE>
<H2>SEE ALSO</H2><PRE>
<STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>, <STRONG><A HREF="wresize.3x.html">wresize(3x)</A></STRONG>.
</PRE>
<H2>AUTHOR</H2><PRE>
Thomas Dickey (from an equivalent function written in 1988
for BSD curses).
<STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
</PRE>
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