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From: darin@ut-dillo.UUCP (Darin Adler)
Newsgroups: net.micro.mac
Subject: Re: Delphi Digest Volume 1 Issue 11 (VOLUME INDEXING)
Message-ID: <240@ut-dillo.UUCP>
Date: Mon, 9-Dec-85 14:27:20 EST
Article-I.D.: ut-dillo.240
Posted: Mon Dec  9 14:27:20 1985
Date-Received: Wed, 11-Dec-85 03:41:30 EST
References: <4262@topaz.RUTGERS.EDU>
Organization: UTexas Computation Center, Austin, Texas
Lines: 18

> After trying several methods of trying to find my bug (of using
> _GetVolInfo with indexes) i found somthing VERY strange...  If you do
> not clear the Volume name field of the volume paramter block, the
> system will successfully hunt for volume reference numbers by using
> indexes, but will cause random bomb's when the first non disk trap is
> executed.  This is really strange since in the Tech notes #24 I do not
> remember them clearing the volume name...  As soon as the volume name
> is cleared it works fine. No problems at all... Strange isn't it ?
> Scott

This behavior is not strange at all, considering what _GetVolInfo does with
the name field.  If this field is NIL, it does nothing at all, however, if
it is non-NIL, it returns the volume name in the provided storage
(regardless of the method used to look up the volume).  Thus, leaving this
undefined guarantees that you will trash some random memory.
-- 
Darin Adler
{gatech,harvard,ihnp4,seismo}!ut-sally!ut-dillo!darin