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Date: Mon, 02 Feb 2004 20:52:52 +0200
From: "Eli Zaretskii" <eliz AT elta DOT co DOT il>
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To: djgpp AT delorie DOT com
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In-reply-to: <401e4d56$1_2@127.0.0.1> (loneXwolfintj@pacXbell.net.remove.Xs)
Subject: Re: How do I feed output of DOS commands into a program?
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> From: "Robbie Hatley" <loneXwolfintj AT pacXbell DOT net DOT remove DOT Xs>
> Newsgroups: comp.os.msdos.djgpp
> Date: Mon, 2 Feb 2004 05:16:34 -0800
> >
> > The only portable way to do it is with a batch file.
> 
> Hmmm...  how about a non-portable way?  Even that might be
> useful.

A non-portable way involves chasing the DOS memory chain and modifying
it when appropriate.  I don't recommend that, what with the multitude
of possible shell versions out there.  Specifically , NTVDM might
block this entirely (I didn't try, so I don't know).

> Batch files only seem to work for setting environmental variables if not
> invoked  from within a program.  Otherwise, you end up with the same
> thing: variables gone after program exits:
> 
> (program runs...)
> int main(void)
> {
>    system("MyFancyBatchFile.bat"); // set TEST=ASDF
>    return 0;
> }
> (...program exits)
> 
> Then type "set" at DOS prompt, and oops, the variable TEST
> does not exist.  :-(
> 
> Surely there's got to be a way around that dilemma.

Perhaps; but it's hard to tell without knowing what problem, exactly,
are you trying to solve.