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From: jfb@vi.ri.cmu.edu.UUCP
Newsgroups: comp.lang.pascal,comp.sys.ibm.pc
Subject: Re: Environment variables in Turbo Pascal
Message-ID: <1013@vi.ri.cmu.edu>
Date: Fri, 31-Jul-87 18:00:40 EDT
Article-I.D.: vi.1013
Posted: Fri Jul 31 18:00:40 1987
Date-Received: Sun, 2-Aug-87 10:24:42 EDT
References: <151@ivory.SanDiego.NCR.COM> <1690@bellcore.bellcore.com>
Distribution: world
Organization: Carnegie-Mellon University, CS/RI
Lines: 27
Xref: utgpu comp.lang.pascal:204 comp.sys.ibm.pc:5469
Summary: undocumented feature is documented

In article <1690@bellcore.bellcore.com>, tr@wind.bellcore.com (tom reingold) writes:
> In article <151@ivory.SanDiego.NCR.COM> mike@ivory.UUCP (Michael Lodman) writes:
> $ Could someone please email and tell me how to read the DOS environment
> $ variables with Turbo Pascal?
> 
> Mike Morearty posted this to the net a while back.  I made very
> minor changes.  Where I did so, I put my first name (Tom) on the
> line.  The program should be pretty clear.
> 
> I just discovered an undocumented feature of the more recent
> versions of DOS: it is at last possible to obtain argv[0].
> 

The method described is documented, quite clearly, in the PC-DOS 3.0 (3.1?)
manual.  Maybe your documentation is missing it...  I can't even guess.

Supposedly, this was considered a problem in DOS 2.0.  Personally, I've never
had a real desire to know what argv[0] is.  MS-DOS doesn't support links
(hard or symbolic), so each file has a unique name.  But I can see where
you might want to be really friendly or something, and parse argv[0].

Anyway, keep on hacking...

	John Brennen
	jfb@vi.ri.cmu.edu
	Visual Inspection Lab
	Carnegie Mellon Univ.