Where is the size of the environment block?

Article View: comp.os.msdos.programmer

Article #1019

Back to comp.os.msdos.programmer Previous Next

#1019

From: imhw400
Date: Wed, 19 Aug 1992 18:58

17 lines
1308 bytes

WARNING:  newbie-type question follows.  I've been writing mainframe assembly
language for years, but this is my very first program for MSDOS or the 80x86.

I'm writing a gadget that needs to create or update an environment variable. 
I'm writing in Arrowsoft Assembler (the only real-address-mode translator I've
found for free :-) and have no libraries, so I have to code this myself.  I can
find the parent process' environment block with no problem, and (I think) I
understand the format thereof except for one thing:  how do I know the size of
the environment block that I've located, so I don't run off the end and damage
other structures?

So that I don't wind up bugging you-all endlessly, I'll ask another question of
those who answer:  where did you learn the answer?
-- 
Mark H. Wood, Lead Analyst/Programmer    +1 317 274 0749   [@disclaimer@]
Internet:  IMHW400@INDYVAX.IUPUI.EDU     BITNET:  IMHW400@INDYVAX
Celebrate freedom:  read a banned newsgroup.

Technical Details

Message-ID: <1992Aug19.135810.156@indyvax.iupui.edu>

Path: arc1-ca.pugleaf.net!sparky!uunet!destroyer!sol.ctr.columbia.edu!usenet.ucs.indiana.edu!indyvax.iupui.edu!imhw400

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!sparky!uunet!destroyer!sol.ctr.columbia.edu!usenet.ucs.indiana.edu!indyvax.iupui.edu!imhw400
From: imhw400@indyvax.iupui.edu
Newsgroups: comp.os.msdos.programmer
Subject: Where is the size of the environment block?
Message-ID: <1992Aug19.135810.156@indyvax.iupui.edu>
Date: 19 Aug 92 13:58:10 -0500
Lines: 17