From:	David Mikesell <dmikesell AT ee DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Seg fault
Date:	Tue, 10 Feb 1998 23:42:55 -0500
Organization:	eNET Inc. (Report Abuse to abuse AT ee DOT net)
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Message-ID:	<34E12C4F.A2@ee.net>
Reply-To:	dmikesell AT ee DOT net
NNTP-Posting-Host:	209.190.33.50
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

David Mikesell wrote:
> 
> I'm using djgpp 2.01 on dos 6.22 and am trying to work through
> a particularly nasty seg fault bug.  I will purposely keep
> the problem statement general here, but will be happy to
> drill down to the source if nobody can point me in the right
> direction to begin looking.
> 
> I get the seg fault immediately after returning from a function
> that allocates memory...I can't seem to narrow the bug down to
> an offending pointer reference or a free() of a NULL pointer, etc.
> None of the malloc()'s returns a NULL pointer.  Any ideas
> on where to start looking?

	Problem solved.  I was passing an unallocated RGB pointer
to load_pcx().  Got away with it for a while, and then things went
bad. 
	The good thing that came of this was that I developed a set
of safe malloc()/free()/etc. routines, along with debugging routines
to check allocated memory.  Pointed me right to the offending load_pcx()
call.  Live and learn.  
	Thanks for the responses...they pointed me in the right 
direction.

-- 
Dave Mikesell (dmikesell AT ee DOT net)

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