delorie.com/archives/browse.cgi | search |
X-Recipient: | archive-cygwin AT delorie DOT com |
X-SWARE-Spam-Status: | No, hits=-1.9 required=5.0 tests=AWL,BAYES_00,SARE_MSGID_LONG40,SPF_PASS |
X-Spam-Check-By: | sourceware.org |
MIME-Version: | 1.0 |
In-Reply-To: | <20090512173153.GY21324@calimero.vinschen.de> |
References: | <20090512165404 DOT GW21324 AT calimero DOT vinschen DOT de> <416096c60905120956n5521929bm69586f5e6325a994 AT mail DOT gmail DOT com> <20090512173153 DOT GY21324 AT calimero DOT vinschen DOT de> |
Date: | Wed, 13 May 2009 20:04:06 +0100 |
Message-ID: | <416096c60905131204r473ac1d3t4c811f7f0a4cb81f@mail.gmail.com> |
Subject: | Re: [Fwd: [1.7] wcwidth failing configure tests] |
From: | Andy Koppe <andy DOT koppe AT gmail DOT com> |
To: | newlib AT sourceware DOT org, cygwin AT cygwin DOT com |
X-IsSubscribed: | yes |
Mailing-List: | contact cygwin-help AT cygwin DOT com; run by ezmlm |
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 |
2009/5/12 Corinna Vinschen: >> Trouble is, there's the thorny issue of the "CJK Ambiguous Width" >> category of characters, which consists of things like Greek and >> Cyrillic letters as well as line drawing symbols. Those have a width >> of 1 in Western use, yet with CJK fonts they have a width of 2. That's >> why Markus Kuhn's code includes the mk_wcswidth_cjk() variant. > > We should use the standard variation alone, imho. I'm not sure that CJK users would be happy with that. See MinTTY issue 88 for my misguided attempts to dismiss this as a legacy issue: http://code.google.com/p/mintty/issues/detail?id=3D88 In comment 8 on that, "deenheart" mentioned that he was working on a fix for wcwidth(). I don't know what he had in mind, but I'd suspect something based on an environment variable setting. > And we need some workaround for UTF-16 systems like Cygwin. > Unfortunately, surrogate pairs only work well as part of a string, not > as standalone chars. =C2=A0So wcwidth would return -1 for each single cha= r, > but wcswidth could be tweaked to handle them gracefully. Looking at the ranges in wcwidth.c, it might be possible to decide the width of a surrogate pair based on the high surrogate only, and then treat the low surrogate as a combining character with length 0. Andy -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
webmaster | delorie software privacy |
Copyright © 2019 by DJ Delorie | Updated Jul 2019 |