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* Author: Thomas E. Dickey <dickey@clark.net> 1996,1997,2002
* @Id: resizeterm.3x,v 1.9 2002/02/16 22:32:24 tom Exp @
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<H1>resizeterm 3x</H1>
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<PRE>
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</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.
</PRE>
<H2>SEE ALSO</H2><PRE>
<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).
</PRE>
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