From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by sourceware.org (Postfix) with ESMTP id 5B6B03870908 for ; Fri, 18 Sep 2020 17:53:50 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 5B6B03870908 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 X-Spam-Status: No, score=-8.0 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H5, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Sep 2020 17:53:51 -0000 * 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