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30 * Author: Thomas E. Dickey 1996-on
31 * @Id: resizeterm.3x,v 1.17 2013/06/22 20:41:54 tom Exp @
35 <TITLE>resizeterm 3x</TITLE>
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40 <H1>resizeterm 3x</H1>
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>
51 <STRONG>is_term_resized</STRONG>, <STRONG>resize_term</STRONG>, <STRONG>resizeterm</STRONG> - change the
56 <H2>SYNOPSIS</H2><PRE>
57 <STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
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>
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 such as
73 the <STRONG>LINES</STRONG> and <STRONG>COLS</STRONG> variables.
75 Most of the work is done by the inner function
76 <STRONG>resize_term</STRONG>. The outer function <STRONG>resizeterm</STRONG> adds bookkeep-
77 ing for the SIGWINCH handler. When resizing the windows,
78 <STRONG>resize_term</STRONG> blank-fills the areas that are extended. The
79 calling application should fill in these areas with appro-
80 priate data. The <STRONG>resize_term</STRONG> function attempts to resize
81 all windows. However, due to the calling convention of
82 pads, it is not possible to resize these without addi-
83 tional interaction with the application.
85 A support function <STRONG>is_term_resized</STRONG> is provided so that
86 applications can check if the <STRONG>resize_term</STRONG> function would
87 modify the window structures. It returns TRUE if the win-
88 dows would be modified, and FALSE otherwise.
92 <H2>RETURN VALUE</H2><PRE>
93 Except as noted, these functions return the integer <STRONG>ERR</STRONG>
94 upon failure and <STRONG>OK</STRONG> on success. They will fail if either
95 of the dimensions are less than or equal to zero, or if an
96 error occurs while (re)allocating memory for the windows.
101 While these functions are intended to be used to support a
102 signal handler (i.e., for SIGWINCH), care should be taken
103 to avoid invoking them in a context where <STRONG>malloc</STRONG> or <STRONG>real-</STRONG>
104 <STRONG>loc</STRONG> may have been interrupted, since it uses those func-
107 If ncurses is configured to supply its own SIGWINCH han-
108 dler, the <STRONG>resizeterm</STRONG> function <STRONG>ungetch</STRONG>'s a <STRONG>KEY_RESIZE</STRONG> which
109 will be read on the next call to <STRONG>getch</STRONG>. This is used to
110 alert an application that the screen size has changed, and
111 that it should repaint special features such as pads that
112 cannot be done automatically.
114 If the environment variables <STRONG>LINES</STRONG> or <STRONG>COLUMNS</STRONG> are set,
115 this overrides the library's use of the window size
116 obtained from the operating system. Thus, even if a SIG-
117 WINCH is received, no screen size change may be recorded.
121 <H2>SEE ALSO</H2><PRE>
122 <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>.
127 Thomas Dickey (from an equivalent function written in 1988
132 <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>
136 Man(1) output converted with
137 <a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>