From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eric Abrahamsen Newsgroups: gmane.emacs.devel Subject: expand-file-name, DOS/Windows, and directory separator Date: Tue, 15 Feb 2022 09:59:53 -0800 Message-ID: <87czjodn8m.fsf@ericabrahamsen.net> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="32331"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: emacs-devel@gnu.org Cancel-Lock: sha1:ALUtl2WLX4Xnw+U6XH5S6URxyIU= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Feb 15 19:03:26 2022 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 1nK2Af-0008Ap-VP for ged-emacs-devel@m.gmane-mx.org; Tue, 15 Feb 2022 19:03:25 +0100 Original-Received: from localhost ([::1]:48802 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nK2Ae-0001YB-Or for ged-emacs-devel@m.gmane-mx.org; Tue, 15 Feb 2022 13:03:25 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:48104) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nK27U-0007SY-Ud for emacs-devel@gnu.org; Tue, 15 Feb 2022 13:00:20 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:47502) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nK27P-0000Lc-Ly for emacs-devel@gnu.org; Tue, 15 Feb 2022 13:00:08 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1nK27K-0003SE-LR for emacs-devel@gnu.org; Tue, 15 Feb 2022 18:59:58 +0100 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no 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" Xref: news.gmane.io gmane.emacs.devel:286339 Archived-At: Hi, My reading of `expand-file-name' (I don't really speak C) is that, if we run it over a file path produced by an external process on a Windows machine -- meaning path strings where the directory separator might be a backward slash -- it will normalize that separator to a unix-style forward slash. It looks like fileio.c:1247 calls dostounix_filename, and I'm assuming that's what that does. Is that a correct assumption? Can I rely on that behavior? Again this isn't a file path produced by an Emacs function like `directory-files', but by an external process returning a list of file names into a process buffer. TIA, Eric