From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 67384C43463 for ; Fri, 18 Sep 2020 17:27:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23D5221707 for ; Fri, 18 Sep 2020 17:27:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="iCNe2QQJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726199AbgIRR12 (ORCPT ); Fri, 18 Sep 2020 13:27:28 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:39266 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726121AbgIRR12 (ORCPT ); Fri, 18 Sep 2020 13:27:28 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600450047; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=m8QVUnkJLX2kUdOa2l3dBeTNdSavQsSzrNnDzyRthSQ=; b=iCNe2QQJaSZMgmUlkCVWEI6mRxrNMAFM1T62GUq1g9aB2qmbmi/ge8jb47xcl1c6Vk2y2I 0veSXw44igiz9D0vNUJmRPhU5/izNLBvsZqUPBntvBXWjmDXweMfXXj8mI/71qGgPZr14x 7B2LO210fn/Yzrr/912WR+shZPk3HMM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-156-weVbU0KXOOW7a93Dp1hIFA-1; Fri, 18 Sep 2020 13:27:24 -0400 X-MC-Unique: weVbU0KXOOW7a93Dp1hIFA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A68948064BA; Fri, 18 Sep 2020 17:27:23 +0000 (UTC) Received: from oldenburg2.str.redhat.com (ovpn-113-177.ams2.redhat.com [10.36.113.177]) by smtp.corp.redhat.com (Postfix) with ESMTPS id AA7F610021AA; Fri, 18 Sep 2020 17:27:22 +0000 (UTC) From: Florian Weimer To: Alejandro Colomar Cc: Alejandro Colomar via Libc-alpha , mtk.manpages@gmail.com, linux-man@vger.kernel.org Subject: Re: [PATCH 1/2] system_data_types.7: Document size_t References: <20200918112755.21428-1-colomar.6.4.3@gmail.com> <20200918112755.21428-2-colomar.6.4.3@gmail.com> <87tuvv5f24.fsf@oldenburg2.str.redhat.com> <3d88ecab-1c36-9081-4195-4e1fd054fadf@gmail.com> Date: Fri, 18 Sep 2020 19:27:21 +0200 In-Reply-To: <3d88ecab-1c36-9081-4195-4e1fd054fadf@gmail.com> (Alejandro Colomar's message of "Fri, 18 Sep 2020 17:53:15 +0200") Message-ID: <87v9gb0zd2.fsf@oldenburg2.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org * Alejandro Colomar: > I think I prefer to leave it opaque, showing only the requirements > that POSIX and C make. > > There's really not much gain (basically uint and ulong cover most of the > possibilities; and still it's not a guarantee). > And readers might write non-portable code because of reading that. My idea was it that it stresses that you have to use %zu in order to be portable. %lu works almost everywhere, so that's any easy mistake to make because it still leads to -Werror build failures on s390 (31-bit). Likewise for %ld for ptrdiff_t, it should be %td. > On 2020-09-18 16:34, Florian Weimer wrote: >> that the length modifier for printf and scanf is z, commently used as >> %zu or %zx (%zd is for ssize_t). > > Good idea. > > Would you prefer that, or just refer to printf(3) in See also?. I think it makes sense to spell out %zu and %zx explicitly. Thanks, Florian -- Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn, Commercial register: Amtsgericht Muenchen, HRB 153243, Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill