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 4E52EC43465 for ; Fri, 18 Sep 2020 17:53:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DBA9B21D42 for ; Fri, 18 Sep 2020 17:53:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="NAt0aD4H" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725955AbgIRRxv (ORCPT ); Fri, 18 Sep 2020 13:53:51 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:53411 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726156AbgIRRxv (ORCPT ); Fri, 18 Sep 2020 13:53:51 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600451630; 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=lH9h9OI1OrX+sOe8QnLEUHodUSM9p/K8ns3WKR0aVeo=; b=NAt0aD4H+LZDz8FCPI9RUSIBLrm90yB1MzXHZA3GYiEY9OF7naGl6JJwvs1FVZ/zqjkfyE sTFrgNlBR73E9qml2UEDoeIWnJyFL37dqM7MRWhFvr1B8QPUeILT4X5jXp4oqLTQK9WECZ 7SB0OsAXSAYzoE08McEKMOxBKZAPwYA= 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-207-AP7MahujNkC6Tq2BGj3D_w-1; Fri, 18 Sep 2020 13:53:48 -0400 X-MC-Unique: AP7MahujNkC6Tq2BGj3D_w-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BF14B56C33; Fri, 18 Sep 2020 17:53:46 +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 9997073674; Fri, 18 Sep 2020 17:53:45 +0000 (UTC) From: Florian Weimer To: Paul Eggert Cc: Alejandro Colomar via Libc-alpha , Alejandro Colomar , linux-man@vger.kernel.org, mtk.manpages@gmail.com 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> Date: Fri, 18 Sep 2020 19:53:44 +0200 In-Reply-To: (Paul Eggert's message of "Fri, 18 Sep 2020 10:42:28 -0700") Message-ID: <87imcb0y53.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 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org * Paul Eggert: > On 9/18/20 7:34 AM, Florian Weimer via Libc-alpha wrote: >> the length modifier for printf and scanf is z, commently used as >> %zu or %zx (%zd is for ssize_t). > > While %zd works for ssize_t in glibc, POSIX doesn't guarantee that > it'll work, as ssize_t might not have the same width as size_t. (If > memory serves this goes back to the bad old days when size_t was 64 > bits and ssize_t 32 bits on some platforms.) So if we document %zd we > should say it's a GNU extension to POSIX, or something like that. I didn't know that. It's a good suggestion, 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