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From: info-vax@ucbvax.ARPA
Newsgroups: fa.info-vax
Subject: Re: Single character input to a C program
Message-ID: <8421@ucbvax.ARPA>
Date: Sun, 23-Jun-85 19:44:09 EDT
Article-I.D.: ucbvax.8421
Posted: Sun Jun 23 19:44:09 1985
Date-Received: Mon, 24-Jun-85 06:43:35 EDT
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Organization: University of California at Berkeley
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From: stew%lhasa@harvard.ARPA

I have long wished that dec would make crmode() and nocrmode() work
by setting a flag in the C runtimes which would make them do single
character qio's.  Is this not easy?  Would this not work?

To get escapes through, you have to turn off the TT$M_ESCAPE bit in
your terminal's basic characteristics word, typically with the
IO$_SENSEMODE and IO$_SETMODE functions of SYS$QIO.  A good example
of this can be found in the support for vms that I wrote for the
new version of C-KERMIT, which is available by anonymous ftp from
CU20A.  This implements, entirely in C, the necessary calls to
system services to do single character IO and other useful things
like typeahead sensing.  It is in KER:CKVTIO.C.  You may be able
to use this directly, or at least it will show you how to do such
things from C.  If I remember correctly, it does not turn off
TT$M_ESCAPE, it uses pasthru mode instead, but perhaps this is
what you want anyway.

Stew