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Fri, 2 Oct 2020 13:14:02 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 37F851600DA; Fri, 2 Oct 2020 13:14:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id tseiFp9g3r0C; Fri, 2 Oct 2020 13:14:02 -0700 (PDT) Received: from [192.168.1.9] (cpe-23-243-218-95.socal.res.rr.com [23.243.218.95]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id EFEFC1600D1; Fri, 2 Oct 2020 13:14:01 -0700 (PDT) Subject: Re: [PATCH v4 1/2] system_data_types.7: Add 'void *' To: Alejandro Colomar Cc: mtk.manpages@gmail.com, linux-man@vger.kernel.org, gcc-patches@gcc.gnu.org, libc-alpha@sourceware.org, linux-kernel@vger.kernel.org, jwakely.gcc@gmail.com, David.Laight@ACULAB.COM References: <20201002121645.23646-1-colomar.6.4.3@gmail.com> <20201002151419.32053-2-colomar.6.4.3@gmail.com> <3941e130-df05-778b-dc76-90cd58400192@cs.ucla.edu> From: Paul Eggert Autocrypt: addr=eggert@cs.ucla.edu; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/2/20 11:38 AM, Alejandro Colomar wrote: > .I void * > > renders with a space in between. That's odd, as "man(7)" says "All of the arguments will be printed next to each other without intervening spaces". I'd play it safe and quote the arg anyway. > > %p works with any object pointer type (or in POSIX, any pointer type), > > not just  void *. > In theory, no (if otherwise, I'd like to know why): Oh, you're right. I had missed that. In GNU/Linux hosts, though, any pointer (including function pointers) can be given to %p. The only platforms where %p wouldn't work on all pointers would be platforms like IBM i, which has both 64-bit (process local) pointers and 128-bit (tagged space) pointers and where you can declare and use pointers of different widths in the same program.