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Date:	Fri, 4 Mar 2005 23:37:34 -0500 (EST)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	cygwin AT cygwin DOT com
Subject:	Re: Bug diff 2.8.7: Separate dir
In-Reply-To:	<4228F306.C1B09E85@dessent.net>
Message-ID:	<Pine.GSO.4.61.0503042332270.12630@slinky.cs.nyu.edu>
References:	<20050304230549 DOT DF5187EC3 AT mail DOT phys DOT uu DOT nl> <4228F306 DOT C1B09E85 AT dessent DOT net>
MIME-Version:	1.0

On Fri, 4 Mar 2005, Brian Dessent wrote:

> Arend-Jan Westhoff wrote:
> >
> > Noticed that when diff is run with two differing files,
> > one with and one without a directory specifier:
> >         diff a someDir\b
> > then all lines are reported as different.
> > Whereas when both have a directory specifier:
> >         diff .\a someDir\b
> > output is normal.
> > (Filenames, argument order or using -d seem irrelevant.
> > Using / instead of \ makes output normal also:
> >         diff a someDir/b
> > output is normal.
> > Similarly when comparing a and someDir\a as:
> >         diff a someDir
> > output is also normal.
> > )
>
> I cannot reproduce this, either from a bash prompt or from cmd using
> your .bat file:

I can reproduce this (even under bash).  All you need is a textmode mount
and files with CRLF line endings.

> It's probably a textmode/binmode issue, though I don't know why
> switching between '\' and '/' as the path seperator changes it --
> although the Cygwin path handling code is complex and I can't pretend to
> understand it.

Having a '\' in a filename bypasses Cygwin's mounts and uses regular
Windows mechanisms for opening the file.  Reading a file on a textmode
mount will translate CRLF line endings to normal LFs.  No wonder 'diff' is
confused.

> There was no attached cygcheck so I don't know how your mounts are setup
> but from what I've read, using textmode mounts with tools like cvs and
> diff is a recipe for disaster.

Yep.  One possible workaround is to use the '--strip-trailing-cr' option
to diff, which will make it insensitive to textmode/binmode line endings.
	Igor
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