From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: documentation of integers, fixnums and bignums Date: Sat, 8 Sep 2018 13:15:54 -0700 Organization: UCLA Computer Science Department Message-ID: <92915cae-21d5-c365-89f2-3a15fc9114c4@cs.ucla.edu> References: <0f632217-27ad-4f54-8ce0-480301fa2a86@cs.ucla.edu> <83pnxorm37.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: blaine.gmane.org 1536437697 25481 195.159.176.226 (8 Sep 2018 20:14:57 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 8 Sep 2018 20:14:57 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 To: Stefan Monnier , emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Sep 08 22:14:53 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 1fyjd3-0006Sf-WC for ged-emacs-devel@m.gmane.org; Sat, 08 Sep 2018 22:14:53 +0200 Original-Received: from localhost ([::1]:45130 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fyjfA-00040X-BE for ged-emacs-devel@m.gmane.org; Sat, 08 Sep 2018 16:17:00 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:57824) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fyjeC-0003ZX-G5 for emacs-devel@gnu.org; Sat, 08 Sep 2018 16:16:01 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fyje9-000851-CU for emacs-devel@gnu.org; Sat, 08 Sep 2018 16:16:00 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:60378) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fyje9-00082o-5i for emacs-devel@gnu.org; Sat, 08 Sep 2018 16:15:57 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 86B181615A6; Sat, 8 Sep 2018 13:15:55 -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 biuupwGwlF-g; Sat, 8 Sep 2018 13:15:54 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id CD2B41615FB; Sat, 8 Sep 2018 13:15:54 -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 TWw8m_SBpYHc; Sat, 8 Sep 2018 13:15:54 -0700 (PDT) Original-Received: from [192.168.1.9] (cpe-23-242-74-103.socal.res.rr.com [23.242.74.103]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id A9E3A1615E8; Sat, 8 Sep 2018 13:15:54 -0700 (PDT) In-Reply-To: Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 131.179.128.68 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:229516 Archived-At: Stefan Monnier wrote: >> encode-char could potentially return a value that cannot be >> represented as a fixnum. > Can this still happen? When? When INDEX_TO_CODE_POINT returns a code point greater than most-positive-fixnum, which can happen (in theory, at least) on 32-bit platforms. Formerly, such a code point caused Emacs to return a negative fixnum or junk, depending on the code point. Now it causes Emacs to return an integer with the proper value. I don't know of any charsets that actually do that. Possibly Emacs should simply report an error if it runs across one, as that would simplify the code point processing internals.