X-Recipient: archive-cygwin AT delorie DOT com
X-Spam-Check-By: sourceware.org
Date: Thu, 24 Feb 2011 12:14:47 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Mg3a - a version of Mg2a developed on Cygwin
Message-ID: <20110224111447.GS9392@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
References: <35i9m6pt07r66fib882etg5tgirkr413co AT 4ax DOT com> <0105D5C1E0353146B1B222348B0411A209DAA0FF98 AT NIHMLBX02 DOT nih DOT gov> <fklam6ptp2uu7o029pkng8e4vc953fnfme AT 4ax DOT com> <ijmam6h3u1vq8nepvdlfo3hcb5feoeihav AT 4ax DOT com> <20110224085617 DOT GM9392 AT calimero DOT vinschen DOT de> <4nccm61h5q3f207me4u69qfk6i0vqrd2f2 AT 4ax DOT com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <4nccm61h5q3f207me4u69qfk6i0vqrd2f2@4ax.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Id: <cygwin.cygwin.com>
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

On Feb 24 11:56, Bengt Larsson wrote:
> Corinna Vinschen wrote:
> >Just a hint:
> >
> >When on Cygwin, you might better use Cygwin's(*) wcwidth function.  It's
> >based on the same code from Markus Kuhn, but it interacts with the
> >setlocale function to make sure that the width returned for the CJK
> >ambiguous width characters makes sense in the given locale.  Plus, it
> >supports a Cygwin-specific locale modifier '@cjknarrow' which allows the
> >user to modify this behaviour.  When using your own wcwidth, you're
> >giving up on this feature.
> >
> >Better yet, convert wide chars to wide strings and use the wcswidth
> >function.  In contrast to wcwidth, it can also handle surrogate pairs.
> 
> I don't use surrogates. I only use UTF-8 and UTF-32. But using cygwin's
> wcwidth may be worth thinking about. I suppose it will be consistent
> with mintty that way; otherwise not?

Yes, I think Andy uses the system functions as well.

As for the wide char representation, wchar_t is UTF-16 on Cygwin, as on
the underlying Windows, and surrogate pairs are always possible.
You can't use any libc wide char function if you assume UTF-32.

> Using wcswidth isn't very useful in the editor because it has special
> requirements, like showing control characters with ^C.

Well, it's not really such a big problem to special case wide char
control values and just call wcswidth otherwise...

> That's one of the
> reasons I mostly wrote my own, all the special requirements. I always
> iterate of bytes, which are converted in a mode-dependent way to ints
> (UTF-32). Do you have a case-insensitive compare? Because I limited that
> to ASCII.

wcscasecmp and wcsncasecmp are both available.  But obviously they
use UTF-16, since wchar_t is UTF-16.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple