From owner-sc22wg14+sc22wg14-domo2=www.open-std.org@open-std.org Sat Mar 28 20:48:24 2020 Return-Path: X-Original-To: sc22wg14-domo2 Delivered-To: sc22wg14-domo2@www.open-std.org Received: by www.open-std.org (Postfix, from userid 521) id EFDAB9DB16D; Sat, 28 Mar 2020 20:48:23 +0100 (CET) Delivered-To: sc22wg14@open-std.org Received: from smtp88.iad3a.emailsrvr.com (smtp88.iad3a.emailsrvr.com [173.203.187.88]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by www.open-std.org (Postfix) with ESMTP id B1F09358D3B for ; Sat, 28 Mar 2020 20:48:22 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=honermann.net; s=20180930-2j89z3ji; t=1585424901; bh=jHwoRd6S5N02p1Vmd7DvYOfyX4S/2DXSB4YSKYAl2vE=; h=Subject:To:From:Date:From; b=n7Ae61x6+FWO9xxwQctA6ks/73k1bma6g6OKzumkNtYiyPmheufGEmeEtE8GhA8RX fA1Ku/8FNi/aayeh8uMaaQve3QWVpK9adQDTYBCmv6c5pSPdBmWI7gXtPyLpJMyw8S r0GExg8FnG3hPShFtVLx+U+nsCdae+KFQ8NLy/i4= X-Auth-ID: tom@honermann.net Received: by smtp20.relay.iad3a.emailsrvr.com (Authenticated sender: tom-AT-honermann.net) with ESMTPSA id 8A6B324880; Sat, 28 Mar 2020 15:48:21 -0400 (EDT) X-Sender-Id: tom@honermann.net Received: from [192.168.1.13] (pool-74-110-208-227.rcmdva.fios.verizon.net [74.110.208.227]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA) by 0.0.0.0:587 (trex/5.7.12); Sat, 28 Mar 2020 15:48:21 -0400 Subject: Re: (SC22WG14.17684) mbrtowc() wording ambiguities and surprising implementation behavior To: Florian Weimer Cc: wg14 , SG16 References: <20200328044149.75FAD3589AA@www.open-std.org> <20200328142924.1B4ED3589A5@www.open-std.org> From: Tom Honermann Message-ID: <92ab2dac-c1e2-ef5f-2b96-9108ca6f8c9e@honermann.net> Date: Sat, 28 Mar 2020 15:48:21 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200328142924.1B4ED3589A5@www.open-std.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Classification-ID: 978d97be-c584-43af-a291-d3935e22f175-1-1 Sender: owner-sc22wg14@open-std.org Precedence: bulk On 3/28/20 10:23 AM, Florian Weimer wrote: > * Tom Honermann: > >> I came across the following issues while testing an implementation of mbrtoc8() [1] I'm >> working on. The implementation uses mbrtowc() internally. >> >> The issues concern the return value of mbrtowc() in two related >> scenarios. > I think I raised a similar issue a while back: > > From: Florian Weimer > Subject: (SC22WG14.16670) One multibyte sequences, multiple wide characters > To: sc22wg14 > Date: Wed, 08 May 2019 14:15:20 +0200 > Message-Id: <20190508121530.E64BA35669A@www.open-std.org> Thanks, that archived message is available at http://open-std.org/jtc1/sc22/wg14/16670.  And yes, that does match one of the issues I described. > > Other feedback I received regarding this issue is that Big5 is simply > not an enconding supported by ISO C. That aligns with Hubert's response.  As mentioned in my response to him, I think this is a case where it would make sense to change the C standard to better match existing practice. Tom. > > Thanks, > Florian >