From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.devel Subject: Re: Case mapping of sharp s Date: Sat, 21 Nov 2009 10:33:47 +0100 Message-ID: References: <4B05A11F.5000700@gmx.de> <4B05D3EE.2000101@gmx.de> <4B0759BA.2010303@gmx.de> <83k4xkp84j.fsf@gnu.org> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1258796110 348 80.91.229.12 (21 Nov 2009 09:35:10 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 21 Nov 2009 09:35:10 +0000 (UTC) Cc: grischka , emacs-devel@gnu.org, monnier@iro.umontreal.ca, handa@m17n.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Nov 21 10:35:03 2009 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1NBmMw-0006Q2-7r for ged-emacs-devel@m.gmane.org; Sat, 21 Nov 2009 10:35:02 +0100 Original-Received: from localhost ([127.0.0.1]:46797 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NBmMv-0001fI-OJ for ged-emacs-devel@m.gmane.org; Sat, 21 Nov 2009 04:35:01 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NBmM0-0001KY-Mn for emacs-devel@gnu.org; Sat, 21 Nov 2009 04:34:04 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1NBmLv-0001IE-Lp for emacs-devel@gnu.org; Sat, 21 Nov 2009 04:34:03 -0500 Original-Received: from [199.232.76.173] (port=56086 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NBmLv-0001I7-E0 for emacs-devel@gnu.org; Sat, 21 Nov 2009 04:33:59 -0500 Original-Received: from mail-out.m-online.net ([212.18.0.10]:59132) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1NBmLq-0003vw-AU; Sat, 21 Nov 2009 04:33:54 -0500 Original-Received: from mail01.m-online.net (mail.m-online.net [192.168.3.149]) by mail-out.m-online.net (Postfix) with ESMTP id B1E781C0028F; Sat, 21 Nov 2009 10:33:49 +0100 (CET) Original-Received: from localhost (dynscan2.mnet-online.de [192.168.1.215]) by mail.m-online.net (Postfix) with ESMTP id 9E8FD918B9; Sat, 21 Nov 2009 10:33:49 +0100 (CET) X-Virus-Scanned: amavisd-new at mnet-online.de Original-Received: from mail.mnet-online.de ([192.168.3.149]) by localhost (dynscan2.mnet-online.de [192.168.1.215]) (amavisd-new, port 10024) with ESMTP id uBvCADvvkHkK; Sat, 21 Nov 2009 10:33:48 +0100 (CET) Original-Received: from igel.home (DSL01.83.171.146.235.ip-pool.NEFkom.net [83.171.146.235]) by mail.mnet-online.de (Postfix) with ESMTP; Sat, 21 Nov 2009 10:33:48 +0100 (CET) Original-Received: by igel.home (Postfix, from userid 501) id 13582CA28C; Sat, 21 Nov 2009 10:33:47 +0100 (CET) X-Yow: I demand IMPUNITY! In-Reply-To: <83k4xkp84j.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 21 Nov 2009 10:58:04 +0200") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:117423 Archived-At: Eli Zaretskii writes: > CHAR_TO_BYTE could be expensive, yes. But how else can you convert an > arbitrary character position to the corresponding byte position? When > you scan forward, you know the byte length of a multi-byte UTF-8 > sequence by the first byte, but what do you do when you scan backwards? The first byte of a UTF-8 sequence is easily recognizable, so finding out the length of the previous UTF-8 sequence is nearly as easy (see DEC_POS). Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."