From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.bugs Subject: bug#32252: [PATCH] %o and %x now format signed numbers Date: Tue, 24 Jul 2018 17:50:46 -0700 Organization: UCLA Computer Science Department Message-ID: <6f720005-b5e4-5d1c-b4e8-a8992c7635c4@cs.ucla.edu> References: <7e8dd084-7ab9-c2ce-1d6c-e673fa998f11@cs.ucla.edu> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1532479761 8012 195.159.176.226 (25 Jul 2018 00:49:21 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 25 Jul 2018 00:49:21 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 Cc: 32252@debbugs.gnu.org To: Helmut Eller Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Jul 25 02:49:17 2018 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fi7zO-0001vr-WE for geb-bug-gnu-emacs@m.gmane.org; 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Tue, 24 Jul 2018 17:50:47 -0700 (PDT) Original-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 VBsUyxBnbP1P; Tue, 24 Jul 2018 17:50:47 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 16188160811; Tue, 24 Jul 2018 17:50:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-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 hPYPFNqVjmpE; Tue, 24 Jul 2018 17:50:47 -0700 (PDT) Original-Received: from [192.168.1.9] (unknown [47.154.30.119]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id C659616077A; Tue, 24 Jul 2018 17:50:46 -0700 (PDT) Openpgp: preference=signencrypt Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBfgQTAQIAKAUCTIByZAIbAwUJEswDAAYLCQgHAwIG FQgCCQoLBBYCAwECH In-Reply-To: Content-Language: en-US X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:148906 Archived-At: Helmut Eller wrote: > In practice, printf ("%x", (int)N) prints the bits in N as unsigned > integer not as signed integer. That's two operations not one, and even there the results disagree with w= hat=20 (format "%x" N) does. On every Emacs platform I've ever used the C output= begins=20 with a different hex digit than the Emacs Lisp output. Emacs has never do= ne %x=20 just like that unportable C code, and likely will never do so. > #x-1 maybe interesting to the read function but it's not interesting to > humans. Humans want to see #x3fffffffffffffff. I doubt very much that most humans really want to see an error-prone nota= tion=20 like that (can you easily spot the difference between it and=20 #x3ffffffffffffffff? I can't). And even if some humans did want it, they = won't=20 get it on 32-bit Emacs. This whole idea is a bad approach for Emacs. What I expect most users would prefer is an approach where 'read' and 'fo= rmat'=20 are inverses, e.g., (read (printf "#x%x" N)) returns N for every integer = N.=20 Emacs doesn't do that now, and the proposed patch fixes things so that it= does.=20 No other approach has been proposed that would make much sense (that is, = be=20 portable, be easily extendible to bignums, that sort of thing). > you should have no problem with introducing an > new specifier for this. I'd rather not, as the hex stuff has never worked right in Emacs and we=20 shouldn't be codifying old bugs.