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Date: Thu, 29 Oct 2015 09:30:57 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Bug in collation functions?
Message-ID: <20151029083057.GH5319@calimero.vinschen.de>
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References: <563148AF.1000502@cornell.edu> <5631996D.7040908@redhat.com> <20151029075050.GE5319@calimero.vinschen.de>
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On Oct 29 08:50, Corinna Vinschen wrote:
> On Oct 28 21:58, Eric Blake wrote:
> > On 10/28/2015 04:14 PM, Ken Brown wrote:
> > > It's my understanding that collation is supposed to take whitespace a=
nd
> > > punctuation into account in the POSIX locale but not in other locales.
> >=20
> > Not quite right. It is up to the locale definition whether whitespace
> > affects collation.  But you are correct that in the POSIX locale,
> > whitespace must not be ignored in collation.
> >=20
> > > This doesn't seem to be the case on Cygwin.  Here's a test case using
> > > wcscoll, but the same problem occurs with strcoll.
> >=20
> > That's because the locale definitions are different in cygwin than they
> > are in glibc.  But it is not a bug in Cygwin; POSIX allows for different
> > systems to have different locale definitions while still using the same
> > locale name like en_US.UTF-8.
>=20
> Btw, strcoll and wcscoll in Cygwin are implemented using the Windows
> function CompareStringW with the LCID set to the locale matching the
> POSIX locale setting.  I'm rather glad I didn't have to implement this
> by myself... :}

OTOH, CompareString has a couple of flags to control its behaviour, see
https://msdn.microsoft.com/en-us/library/windows/desktop/dd317761%28v=3Dvs.=
85%29.aspx

Right now Cygwin calls CompareStringW with dwCmpFlags set to 0, but there
are flags like NORM_IGNORENONSPACE, NORM_IGNORESYMBOLS.  I'm open to a
discussion how to change the settings to more closely resemble the rules
on Linux.

E.g.  wcscoll simply calls wcscmp rather than CompareStringW for the
C/POSIX locale anyway.  So, would it makes sense to set the flags to
NORM_IGNORESYMBOLS in other locales?


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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