Path: utzoo!censor!geac!maccs!cs4g6ag
From: cs4g6ag@maccs.dcss.mcmaster.ca (Stephen M. Dunn)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Turbo C PUTENV/GETENV
Message-ID: <2576CE28.8924@maccs.dcss.mcmaster.ca>
Date: 1 Dec 89 19:16:55 GMT
References: <2572998E.2456@maccs.dcss.mcmaster.ca> <569@bmers58.UUCP>
Reply-To: cs4g6ag@maccs.dcss.mcmaster.ca (Stephen M. Dunn)
Organization: McMaster University, Hamilton, Ontario
Lines: 23

In article <569@bmers58.UUCP> mlord@bmers58.UUCP (Mark Lord) writes:
$Stephen M. Dunn (hey, that's me!) writes of a problem with putenv in Turbo
$C
$I don't have my DOS references here, but somewhere in the psp is the pointer
$to your environment, that both DOS and TURBOC use (offset 16?).  A pointer to
$your psp is in _PSP, a predefined turbo-c variable that you can use.
$The current size is stored in the MCB (memory control block) which immediately
$preceeds it in memory (again.. no books = no offset for now..).

   The pointer is at offset 2Ch, if memory serves ... but I don't have my
book here, anyway.

[method for solving problem deleted]

   Actually, someone wrote to me with a better answer, which is that
Turbo C doesn't copy your string, it actually just hangs on to the pointer
to it, so you can't reuse the variable.  Now it works.

-- 
Stephen M. Dunn                               cs4g6ag@maccs.dcss.mcmaster.ca
          <std_disclaimer.h> = "\nI'm only an undergraduate!!!\n";
****************************************************************************
They say the best in life is free // but if you don't pay then you don't eat