.\" Copyright (c) 1980 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)intro.2	6.1 (Berkeley) %G%
.\"
.sh 1 Variables
.pp
Many variables which are used to describe the terminal environment
are available to the programmer. They are:
.TS
expand;
lw(6m) lw(8n) lw(50n).
type	name	description
_
WINDOW *	curscr	T{
.fi
current version of the screen (terminal screen).
T}
WINDOW *	stdscr	T{
standard screen.  Most updates are usually done here.
T}
char *	Def\*_term	T{
default terminal type if type cannot be determined
T}
bool	My\*_term	T{
use the terminal specification in \fIDef\*_term\fR as terminal,
irrelevant of real terminal type
T}
char *	ttytype	T{
full name of the current terminal.
T}
int	LINES	T{
number of lines on the terminal
T}
int	COLS	T{
number of columns on the terminal
T}
int	ERR	T{
error flag returned by routines on a fail.
T}
int	OK	T{
error flag returned by routines when things go right.
T}
.TE
.pp
There are also several
.q #define
constants and types
which are of general usefulness:
.sp
.ev 1
.ta 11n
.(b L
.nf
reg	storage class ``register'' (\fIe.g.\fP, \fIreg int i;\fR\|)
bool	boolean type, actually a ``char'' (\fIe.g.\fP, \fIbool doneit;\fR\|)
TRUE	boolean ``true'' flag (1).
FALSE	boolean ``false'' flag (0).
.fi
.ev
.)b
.lp