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<H1 class="no-header">curs_variables 3x</H1>
<PRE>
<STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG> <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>COLORS</STRONG>, <STRONG>COLOR_PAIRS</STRONG>, <STRONG>COLS</STRONG>, <STRONG>ESCDELAY</STRONG>, <STRONG>LINES</STRONG>, <STRONG>TABSIZE</STRONG>, <STRONG>curscr</STRONG>, <STRONG>newscr</STRONG>,
<STRONG>stdscr</STRONG> - <STRONG>curses</STRONG> global variables
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>COLOR_PAIRS;</STRONG>
<STRONG>int</STRONG> <STRONG>COLORS;</STRONG>
<STRONG>int</STRONG> <STRONG>COLS;</STRONG>
<STRONG>int</STRONG> <STRONG>ESCDELAY;</STRONG>
<STRONG>int</STRONG> <STRONG>LINES;</STRONG>
<STRONG>int</STRONG> <STRONG>TABSIZE;</STRONG>
<STRONG>WINDOW</STRONG> <STRONG>*</STRONG> <STRONG>curscr;</STRONG>
<STRONG>WINDOW</STRONG> <STRONG>*</STRONG> <STRONG>newscr;</STRONG>
<STRONG>WINDOW</STRONG> <STRONG>*</STRONG> <STRONG>stdscr;</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
This page summarizes variables provided by the <STRONG>curses</STRONG> library. A more
complete description is given in the <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG> manual page.
Depending on the configuration, these may be actual variables, or
macros (see <STRONG><A HREF="curs_threads.3x.html">curs_threads(3x)</A></STRONG> and <STRONG><A HREF="curs_opaque.3x.html">curs_opaque(3x)</A></STRONG>) which provide read-
only access to <EM>curses</EM>'s state. In either case, applications should
treat them as read-only to avoid confusing the library.
</PRE><H3><a name="h3-COLOR_PAIRS">COLOR_PAIRS</a></H3><PRE>
After initializing curses, this variable contains the number of color
pairs which the terminal can support. Usually the number of color
pairs will be the product <STRONG>COLORS</STRONG>*<STRONG>COLORS</STRONG>, however this is not always
true:
<STRONG>o</STRONG> a few terminals use HLS colors, which do not follow this rule
<STRONG>o</STRONG> terminals supporting a large number of colors are limited by the
number of color pairs that can be represented in a <EM>signed</EM> <EM>short</EM>
value.
</PRE><H3><a name="h3-COLORS">COLORS</a></H3><PRE>
After initializing curses, this variable contains the number of colors
which the terminal can support.
</PRE><H3><a name="h3-COLS">COLS</a></H3><PRE>
After initializing curses, this variable contains the width of the
screen, i.e., the number of columns.
</PRE><H3><a name="h3-ESCDELAY">ESCDELAY</a></H3><PRE>
This variable holds the number of milliseconds to wait after reading an
escape character, to distinguish between an individual escape character
entered on the keyboard from escape sequences sent by cursor- and func-
tion-keys (see <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>).
</PRE><H3><a name="h3-LINES">LINES</a></H3><PRE>
After initializing curses, this variable contains the height of the
screen, i.e., the number of lines.
</PRE><H3><a name="h3-TABSIZE">TABSIZE</a></H3><PRE>
This variable holds the number of columns used by the <EM>curses</EM> library
when converting a tab character to spaces as it adds the tab to a win-
dow (see <STRONG><A HREF="curs_addch.3x.html">curs_addch(3x)</A></STRONG>.
</PRE><H3><a name="h3-The-Current-Screen">The Current Screen</a></H3><PRE>
This implementation of curses uses a special window <STRONG>curscr</STRONG> to record
its updates to the terminal screen.
This is referred to as the "physical screen" in the <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
and <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG> manual pages.
</PRE><H3><a name="h3-The-New-Screen">The New Screen</a></H3><PRE>
This implementation of curses uses a special window <STRONG>newscr</STRONG> to hold up-
dates to the terminal screen before applying them to <STRONG>curscr</STRONG>.
This is referred to as the "virtual screen" in the <STRONG><A HREF="curs_kernel.3x.html">curs_kernel(3x)</A></STRONG>,
<STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG> and <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG> manual pages.
</PRE><H3><a name="h3-The-Standard-Screen">The Standard Screen</a></H3><PRE>
Upon initializing curses, a default window called <STRONG>stdscr</STRONG>, which is the
size of the terminal screen, is created. Many curses functions use
this window.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
The curses library is initialized using either <STRONG><A HREF="curs_initscr.3x.html">initscr(3x)</A></STRONG>, or
<STRONG><A HREF="curs_initscr.3x.html">newterm(3x)</A></STRONG>.
If <STRONG>curses</STRONG> is configured to use separate curses/terminfo libraries, most
of these variables reside in the curses library.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
<STRONG>TABSIZE</STRONG> is a feature of SVr4 curses which is not documented by X/Open
curses.
<STRONG>o</STRONG> In SVr4 curses, <STRONG>TABSIZE</STRONG> is initially set from the terminal descrip-
tion's <STRONG>init_tabs</STRONG> capability. After that, it can be altered by the
applications using SVr4 curses.
SVr4 curses uses the current value of <STRONG>TABSIZE</STRONG> to compute the posi-
tion of tabstops for updating both the virtual screen with <STRONG>add-</STRONG>
<STRONG><A HREF="addch.3x.html">ch(3x)</A></STRONG> as well as the physical screen with <STRONG><A HREF="curs_terminfo.3x.html">mvcur(3x)</A></STRONG>.
<STRONG>o</STRONG> This implementation uses the current value of <STRONG>TABSIZE</STRONG> only for up-
dating the virtual screen. It uses the terminal description's <STRONG>it</STRONG>
(<STRONG>init_tabs</STRONG>) capability for computing hardware tabs (i.e., tab stops
on the physical screen).
<STRONG>o</STRONG> Other implementations differ. For instance, NetBSD curses allows
<STRONG>TABSIZE</STRONG> to be set through an environment variable. This implemen-
tation does not.
NetBSD curses does not support hardware tabs; it uses the <STRONG>init_tabs</STRONG>
capability and the <STRONG>TABSIZE</STRONG> variable only for updating the virtual
screen.
<STRONG>ESCDELAY</STRONG> is an extension in AIX curses:
<STRONG>o</STRONG> In AIX, the units for <STRONG>ESCDELAY</STRONG> are <EM>fifths</EM> of a millisecond.
<STRONG>o</STRONG> The default value for AIX's <STRONG>ESCDELAY</STRONG> is 0.1 seconds.
<STRONG>o</STRONG> AIX also enforces a limit of 10,000 seconds for <STRONG>ESCDELAY</STRONG>; this im-
plementation currently has no upper limit.
This implementation has long used <STRONG>ESCDELAY</STRONG> with units of milliseconds,
making it impossible to be completely compatible with AIX. Likewise,
most users have either decided to override the value, or rely upon its
default value.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_opaque.3x.html">curs_opaque(3x)</A></STRONG>, <STRONG><A HREF="curs_terminfo.3x.html">curs_terminfo(3x)</A></STRONG>, <STRONG><A HREF="curs_threads.3x.html">curs_threads(3x)</A></STRONG>,
<STRONG><A HREF="term_variables.3x.html">term_variables(3x)</A></STRONG>, <STRONG><A HREF="terminfo.5.html">terminfo(5)</A></STRONG>.
<STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
<ul>
<li><a href="#h3-COLOR_PAIRS">COLOR_PAIRS</a></li>
<li><a href="#h3-COLORS">COLORS</a></li>
<li><a href="#h3-COLS">COLS</a></li>
<li><a href="#h3-ESCDELAY">ESCDELAY</a></li>
<li><a href="#h3-LINES">LINES</a></li>
<li><a href="#h3-TABSIZE">TABSIZE</a></li>
<li><a href="#h3-The-Current-Screen">The Current Screen</a></li>
<li><a href="#h3-The-New-Screen">The New Screen</a></li>
<li><a href="#h3-The-Standard-Screen">The Standard Screen</a></li>
</ul>
</li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
</div>
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