Very Computer

Hello everybody !

My question  as always is trivial:

How can I determine the characteristics
of a remote terminal from within C program,
say, under UNIX ?   In particular I'm interested
in getting the size of the screen (number of rows
and columns). Formerly I used to determine the
terminal by sending control sequences
like e.g. "\033[c" or "\033[>c" and read the response
which worked fine for VT-series stuff, but it
didn't give size of the screen. Hmmm, curses
give the right answer only for the local terminal,
but give only default 24x80 (or 65x80) size for remote (say,
the one under telnet). On the other hand I saw several
times when some remote applications printed something
like
"reading your environment..."
meaning apparently that they were able to
determine "my environment". Is there any answer ?

Cordially,
Serge

Quote:>How can I determine the characteristics
>of a remote terminal from within C program,
>say, under UNIX ?   In particular I'm interested
>in getting the size of the screen (number of rows
>and columns).

...

Quote:>Is there any answer ?

Of course, Serega.

Use the TIOCGWINSZ function of the ioctl() system call to get the terminal
size. "man ioctl" won't probably supply too much information, but will
provide pointers to the appropriate man pages, which seem to be system
dependent.

Dan
--
Dan Pop
Tel:   +41.22.767.4534

Mail:  CERN - PPE, Bat. 20 R-054, CH-1211 Geneve 23, Switzerland

How about using the termcap library? Use getenv() to get the terminal type,
then read the entry from the termcap database for that terminal type using
tgetent(). You should then be able to read any terminal capability supported
by that terminal type, using tgetnum(), tgetstr() etc. Of course, this is no
use under a windowing system due to window resizing, so you would have to use
an IOCTL. (Even better, catch the SIGWINCH signal and then use ioctl() to
update how large the screen is)

Aj.
--
.-------------------------[ The Eno ]-------------------------------------.