NetNews Usenet Archive 1992 #31/NN_1992_31.iso/spool/comp/os/vms/20094

Text File | 1992-12-30 | 1.9 KB | 44 lines

Newsgroups: comp.os.vms
Path: sparky!uunet!elroy.jpl.nasa.gov!decwrl!deccrl!news.crl.dec.com!dbased.nuo.dec.com!e2big.mko.dec.com!quark.enet.dec.com!lionel
From: [e-mail] (Steve Lionel)
Subject: Re: More than 1 line of command history buffer
Message-ID: <[e-mail]>
Lines: 31
Sender: [e-mail] (Mr. USENET)
Reply-To: [e-mail] (Steve Lionel)
Organization: Digital Equipment Corporation, Nashua NH
References:  <[e-mail]>
Date: Wed, 30 Dec 1992 14:26:43 GMT


In article <[e-mail]>,
[e-mail] (Przemek Klosowski) writes:
|>
|>  I am reading a command line in my program, using C RTL function
|>gets() (I suspect that this just does a plain buffered read from the
|>terminal with NL as terminator, but I am not sure which VMS system
|>function this may be).
|>
|>I like to have the command line editing provided courtesy of VMS
|>system read procedure, and the fact that I can retrieve the previously
|>used command line using the up-arrow key; however, I am spoiled by the
|>DCL 20-line command history (and the readline library I am using on
|>Unix that remembers commands across login sessions).  Is there a
|>simple way to increase the command history list size, so that more
|>than one last command is remembered?
|>

Yes there is, but it entails using the SMG$ RTL facility to do your terminal
reads.  SMG$READ_COMPOSED_LINE supports multiple-line recall.  The VMS
terminal driver, which is what you get with "normal" terminal reads, only
supports one recall line and that cannot be increased.  DCL does its own
recall buffer management, as does SMG$READ_COMPOSED_LINE.  See the SMG$ RTL
manual for more details.
--

Steve Lionel                    [e-mail]
SDT Languages Group
Digital Equipment Corporation
110 Spit Brook Road
Nashua, NH 03062