4.4BSD/usr/src/lib/libcurses/PSD.doc/intro.2

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.sh 1 Variables
.pp
Many variables which are used to describe the terminal environment
are available to the programmer. They are:
.(b
.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{
flag returned by routines upon success.
T}
.TE
.fi
.ev
.)b
.lp