From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: new coding system (was: Re: prettify symbols question) Date: Sat, 14 Nov 2020 18:19:46 +0200 Message-ID: <83d00fvrkt.fsf@gnu.org> References: <834kluzkma.fsf@gnu.org> <831rgyziu3.fsf@gnu.org> <83zh3my2ls.fsf@gnu.org> <83o8k1yb0x.fsf@gnu.org> <83y2j5wio8.fsf@gnu.org> <83sg9dweps.fsf@gnu.org> <83k0upwber.fsf@gnu.org> <83r1owuicp.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="26034"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: "Alfred M. Szmidt" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Nov 14 17:21:16 2020 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kdyIc-0006d9-FA for ged-emacs-devel@m.gmane-mx.org; Sat, 14 Nov 2020 17:21:14 +0100 Original-Received: from localhost ([::1]:56416 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kdyIb-0004B1-Gl for ged-emacs-devel@m.gmane-mx.org; Sat, 14 Nov 2020 11:21:13 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:41346) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kdyHl-0003bp-QO for emacs-devel@gnu.org; Sat, 14 Nov 2020 11:20:21 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:56945) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kdyHl-0005es-HX for emacs-devel@gnu.org; Sat, 14 Nov 2020 11:20:21 -0500 Original-Received: from [176.228.60.248] (port=4986 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1kdyHP-00036a-1R; Sat, 14 Nov 2020 11:20:08 -0500 In-Reply-To: (ams@gnu.org) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:259172 Archived-At: > From: "Alfred M. Szmidt" > Cc: emacs-devel@gnu.org > Date: Sat, 14 Nov 2020 10:29:15 -0500 > > Is this the encoding on Unix systems? If so, maybe try without > mapping characters below ASCII 128, I'm not sure this is supported in > an ASCII-compatible encoding. > > I am not sure I understand. On unix #o0 maps to the MIDDLE DOT, #o1 > to DOWNWARDS ARROW, etc. If the low codes aren't identical to ASCII, then I think ascii-compatible should be nil, and I think the relevant example to follow is that of EBCDIC. I'd suggest to construct a map file by hand, using EBCDIC maps as example, and see if that works. If it doesn't work, we might need to bring Kenichi Handa on board of the discussion. > As I understood it, the charmap/charset is a mapping from UCS-4 > Unicode to whatever is on the target? Not UCS-4, but Unicode codepoints (which is the same thing in practice, but just so we get our terminology right.)