From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Richard Stallman Newsgroups: gmane.emacs.devel Subject: Re: Using the GNU GMP Library for Bignums in Emacs Date: Fri, 04 May 2018 00:22:51 -0400 Message-ID: References: <29f933ac-a6bf-8742-66a7-0a9d6d3e5a88@disroot.org> <83bmecy6fx.fsf@gnu.org> <0d3175d8-d996-651e-b221-71978bde3a65@cs.ucla.edu> <42cbc5ab-2f02-4aa5-4b19-7b2357f91692@cs.ucla.edu> <1f58acbf-a7d8-bf4e-3d0e-a285515a22e6@cs.ucla.edu> <2549728d-8e40-b46a-009e-07cef0c24208@cs.ucla.edu> <63fdd138-77d3-89b9-aa69-490300f588a9@cs.ucla.edu> Reply-To: rms@gnu.org NNTP-Posting-Host: blaine.gmane.org Content-Type: text/plain; charset=Utf-8 X-Trace: blaine.gmane.org 1525407725 11167 195.159.176.226 (4 May 2018 04:22:05 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 4 May 2018 04:22:05 +0000 (UTC) Cc: eller.helmut@gmail.com, emacs-devel@gnu.org To: Paul Eggert Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri May 04 06:22:01 2018 Return-path: Envelope-to: ged-emacs-devel@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 1fESEL-0002mw-1k for ged-emacs-devel@m.gmane.org; Fri, 04 May 2018 06:22:01 +0200 Original-Received: from localhost ([::1]:60367 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fESGR-0006FS-TQ for ged-emacs-devel@m.gmane.org; Fri, 04 May 2018 00:24:11 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:51796) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fESFG-0006Dm-Oc for emacs-devel@gnu.org; Fri, 04 May 2018 00:23:00 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fESFF-00082T-HJ for emacs-devel@gnu.org; Fri, 04 May 2018 00:22:58 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:53264) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fESFA-0007yp-UN; Fri, 04 May 2018 00:22:52 -0400 Original-Received: from rms by fencepost.gnu.org with local (Exim 4.82) (envelope-from ) id 1fESF9-0002L0-TK; Fri, 04 May 2018 00:22:51 -0400 In-reply-to: (message from Paul Eggert on Wed, 2 May 2018 22:53:11 -0700) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:225057 Archived-At: [[[ To any NSA and FBI agents reading my email: please consider ]]] [[[ whether defending the US Constitution against all enemies, ]]] [[[ foreign or domestic, requires you to follow Snowden's example. ]]] > We already have such a feature. For example, (format "%09x" 257) returns > "000000101", which is 257 hexadecimal, expressed using leading zeros as needed > so that at least 9 digits are used. Once Emacs supports bignums, the same > feature can print 40-hex-digit SHA-1 checksums by using (format "%040x" n). Perhaps this way everything would work with all-positive hex numbers. However, I think we also want a feature to signal an error if the number doesn't fall in the range that the %x construct can represent. If the Git hash code is 40 hex digits, any attempt to use as a Git hash code a number that won't fit in 40 hex digits implies that there has already been an error. I suggest %!040x for this. The ! would mean, "Signal an error if the number doesn't fit in the specified number of digits." It could be implemented for all %-specs, but if that is a pain in the neck, it could be implemented only for %x. -- Dr Richard Stallman President, Free Software Foundation (https://gnu.org, https://fsf.org) Internet Hall-of-Famer (https://internethalloffame.org) Skype: No way! See https://stallman.org/skype.html.