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content-class:	urn:content-classes:message
Subject:	RE: Patch for Setup.exe problem and for mklink2.cc
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Date:	Fri, 29 Mar 2002 20:25:08 +1100
Message-ID:	<FC169E059D1A0442A04C40F86D9BA76008ABE7@itdomain003.itdomain.net.au>
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From:	"Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To:	"Ton van Overbeek" <tvoverbe AT cistron DOT nl>, <cygwin-apps AT cygwin DOT com>,
	<cygwin-patches AT cygwin DOT com>
Cc:	<jonas_eriksson AT home DOT se>
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id g2T9PJu20717

> -----Original Message-----
> From: Robert Collins 
> Sent: Thursday, March 28, 2002 1:11 AM
> To: Ton van Overbeek; cygwin-apps AT cygwin DOT com; 
> cygwin-patches AT cygwin DOT com
> Cc: jonas_eriksson AT home DOT se
> Subject: RE: Patch for Setup.exe problem and for mklink2.cc
> 
> 
> 
> 
> > -----Original Message-----
> > From: Ton van Overbeek [mailto:tvoverbe AT cistron DOT nl]
> > Sent: Thursday, March 28, 2002 1:03 AM
> > To: cygwin-apps AT cygwin DOT com; cygwin-patches AT cygwin DOT com
> > Cc: jonas_eriksson AT home DOT se
> > Subject: Patch for Setup.exe problem and for mklink2.cc
> > 
> > 
> > Found the problem causing the segment violation and probably
> > causing Jonas Eriksson's problem. It is a typical case of 
> > 'off by 1'. In PickView::set_headers the loop filling the 
> > window header does one iteration too much, resulting in a 
> > call to DoInsertItem with a NULL string pointer and hence a 
> > crash following. While debugging this I could not compile the 
> > new mklink2.cc ( the
> > c++ version of the original mklink2.c). It seems three & (address of
> > c++ operator)
> > have disappeared in the transition. Putting them back made
> > the compiler happy. Is this OK Robert ?
> 
> I'll check the off-by-one fix in tomorrow, as I'm off to bed now. 

Actually, this is not an off-by-one error. It's an invalid data error -
the loop is meant to go from 0 to == last_col, where last col is meant
to be equal to the greatest column number. The first set of column
details had last_col set incorrectly.

Thanks for pinpointing this though.

Rob

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