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From:	"Rod Pemberton" <do_not_have AT noavailemail DOT cmm>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: argv[0]
Date:	Thu, 1 Dec 2011 20:49:45 -0500
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"Georg" <dosusb AT googlemail DOT com> wrote in message
news:cc43d375-8e59-425d-a32e-b4ca200ae5cc AT 4g2000yqu DOT googlegroups DOT com...
>
> I tried to follow your suggestion 2, but
> did not succeed. It seems to read the environment segment ok
> but does not read the right environment data.

Below are my experiences with your code.  Maybe ... sometime
this weekend, I'll try my suggestions to see what I can determine.

> Can you spot what I am doing
> wrong? I am testing in a Windows XP DOS box.
>
> [code]

I tried that code out.  It has the problem that you mention above.  :-)

From what I can tell, it seems the "environment block" is *somewhere* in the
segment returned by the value at 0x2C.  Where exactly it is within the
segment seems to be the issue.  It seems to move when I recompile... (?!?!)
Within the environment block, there will be a full pathname.  The
"environment block" was well over 27K above the segment start given by value
at 0x2C.  The PSP segment seems to change, but the value at 0x2C always
seems to be 9F 00 here... (?!?!)  So far, I'm not familiar enough with this
to determine if something is incorrect or what is wrong if something is
incorrect.  I'm getting some strange results.  I'm not sure what to make of
them at this point in time.

I hope you have a good, in-depth, book on programming DOS.  You might drop a
post to comp.os.msdos.programmer and ask if anyone knows how to get the
filename.  Mention the PSP and RBIL table 01739.  Their solution will likely
be in assembly or a text description, but that may help.  I haven't searched
the Usenet archives yet.  c.o.m.d. might have something, or another group
might.


Rod Pemberton

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