From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from zimbra.cs.ucla.edu (zimbra.cs.ucla.edu [131.179.128.68]) by sourceware.org (Postfix) with ESMTPS id 3C5153857C7A for ; Fri, 18 Sep 2020 17:42:30 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 3C5153857C7A Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=cs.ucla.edu Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=eggert@cs.ucla.edu Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 79C571600F4; Fri, 18 Sep 2020 10:42:29 -0700 (PDT) Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id TUVdHR-OAqcG; Fri, 18 Sep 2020 10:42:28 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id B979B1600CE; Fri, 18 Sep 2020 10:42:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu 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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 17:42:31 -0000 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.