From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ulrich Mueller Newsgroups: gmane.emacs.devel Subject: Coding systems vietnamese-vscii and vietnamese-tcvn Date: Fri, 21 Jul 2023 13:26:02 +0200 Message-ID: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="15935"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.3 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Jul 21 13:27:22 2023 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 1qMoI5-0003ui-Ri for ged-emacs-devel@m.gmane-mx.org; Fri, 21 Jul 2023 13:27:21 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qMoH7-0002pX-D9; Fri, 21 Jul 2023 07:26:21 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qMoH5-0002kv-QT for emacs-devel@gnu.org; Fri, 21 Jul 2023 07:26:19 -0400 Original-Received: from woodpecker.gentoo.org ([140.211.166.183] helo=smtp.gentoo.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_CHACHA20_POLY1305:256) (Exim 4.90_1) (envelope-from ) id 1qMoH4-0004iM-0i for emacs-devel@gnu.org; Fri, 21 Jul 2023 07:26:19 -0400 Received-SPF: pass client-ip=140.211.166.183; envelope-from=ulm@gentoo.org; helo=smtp.gentoo.org X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 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-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:307996 Archived-At: language/vietnamese.el defines coding systems vietnamese-vscii (with charset vscii) and vietnamese-tcvn (with charset tcvn-5712). However, mule-conf.el defines the two charsets as aliases [1]: (define-charset-alias 'tcvn-5712 'vscii) Indeed, a file containing bytes 0x00 to 0xff decodes to the same buffer contents, regardless if its coding is specified as vscii or as tcvn. Wikipedia also seems to say that these are only different names for the same encoding: https://en.wikipedia.org/wiki/VSCII Should coding system vietnamese-tcvn be an alias for vietnamese-vscii (or the other way around)? [1] I tried to trace the history of this definition, but I gave up at merge(?) commit 8f924df7df01, neither of whose parents have the line. Apparently conversion from CVS isn't perfect.