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: Thu, 26 Jul 2018 00:59:56 -0700 Organization: UCLA Computer Science Department Message-ID: <1c3c61c4-f93f-3bea-f6ed-b89e1cdea89b@cs.ucla.edu> References: <7e8dd084-7ab9-c2ce-1d6c-e673fa998f11@cs.ucla.edu> <6f720005-b5e4-5d1c-b4e8-a8992c7635c4@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 1532591950 6823 195.159.176.226 (26 Jul 2018 07:59:10 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 26 Jul 2018 07:59:10 +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 Thu Jul 26 09:59:06 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 1fibAv-0001i5-SW for geb-bug-gnu-emacs@m.gmane.org; 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Thu, 26 Jul 2018 00:59:59 -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 asUUu5yh65yA; Thu, 26 Jul 2018 00:59:57 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id CBC55160657; Thu, 26 Jul 2018 00:59:57 -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 R52J0RHloz_0; Thu, 26 Jul 2018 00:59:57 -0700 (PDT) Original-Received: from [192.168.1.9] (unknown [47.154.30.119]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 65923160656; Thu, 26 Jul 2018 00:59:57 -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-Spam-Score: -2.3 (--) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-Spam-Score: -3.3 (---) 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:148952 Archived-At: Helmut Eller wrote: > What's more interesting: > (format "%x" (lognot 8)) =3D> "-9" > or > (format "%x" (lognot 8)) =3D> "3ffffffffffffff7" >=20 > For me, the first version is totally useless. Shrug. It's what Common Lisp and Scheme do, and it works pretty well once= you=20 get used to it. Programs that need negative integers displayed modulo som= e power=20 of 2 can use the mod or logand functions; that's the mathematically right= way to=20 do it anyway, and it's machine-independent. > Of course there have been proposals: Do your bignum stuff with a > different format specifier. And prohibit %x on bignums? That would make little sense. Common Lisp and= Scheme=20 don't have any such prohibition; why should Emacs Lisp? Again, programs t= hat=20 need just the low-order bits of a negative integer can use 'mod' or a mas= k. > Here is another proposal: Add a read syntax for unsigned fixnums like > #x3fffffffffffffffu or alternatively #xu3fffffffffffffff. That's heading down the wrong path. Emacs Lisp does not have unsigned fix= nums,=20 so why add a syntax for a data type that does not exist? And Emacs Lisp s= hould=20 not add such a data type, as it is a low-level machine concept unsuitable= for=20 Lisp, is not needed in Emacs Lisp, and would cause unnecessary complexity= in=20 documentation and implementation.