From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Bug in collation functions?
Date: Thu, 29 Oct 2015 15:35:00 -0000 [thread overview]
Message-ID: <20151029083057.GH5319@calimero.vinschen.de> (raw)
In-Reply-To: <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 and
> > > punctuation into account in the POSIX locale but not in other locales.
> >
> > 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.
> >
> > > This doesn't seem to be the case on Cygwin. Here's a test case using
> > > wcscoll, but the same problem occurs with strcoll.
> >
> > 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.
>
> 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=vs.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
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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next prev parent reply other threads:[~2015-10-29 8:31 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-29 7:41 Ken Brown
2015-10-29 7:50 ` Eric Blake
2015-10-29 12:58 ` Corinna Vinschen
2015-10-29 15:35 ` Corinna Vinschen [this message]
2015-10-29 15:51 ` Ken Brown
2015-10-29 16:14 ` Corinna Vinschen
2015-10-29 16:14 ` Ken Brown
2015-10-29 16:51 ` Ken Brown
2015-10-29 18:09 ` Eric Blake
2015-10-29 21:58 ` Ken Brown
2015-10-30 8:05 ` Ken Brown
2015-10-30 14:07 ` Ken Brown
2015-10-30 19:11 ` Corinna Vinschen
2015-10-30 19:14 ` Ken Brown
2015-10-30 21:13 ` Corinna Vinschen
[not found] ` <5634F6BA.7070301@cornell.edu>
2015-11-02 11:14 ` Corinna Vinschen
2015-10-29 16:17 ` Eric Blake
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