From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Replacement for string-as-unibyte-function Date: Sun, 31 Jan 2021 22:03:42 -0500 Message-ID: References: <20210131150133.0fd3b42f@gauss> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="14273"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:TnKq8hctjFlok7h4j47DuxCTiHQ= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Feb 01 04:04:13 2021 Return-path: Envelope-to: geh-help-gnu-emacs@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 1l6PVd-0003d6-3a for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 01 Feb 2021 04:04:13 +0100 Original-Received: from localhost ([::1]:37614 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l6PVc-0002f7-6P for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 31 Jan 2021 22:04:12 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55064) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l6PVI-0002ew-DS for help-gnu-emacs@gnu.org; Sun, 31 Jan 2021 22:03:52 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:43962) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l6PVG-0005Jn-E1 for help-gnu-emacs@gnu.org; Sun, 31 Jan 2021 22:03:52 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1l6PVE-0003Aj-AP for help-gnu-emacs@gnu.org; Mon, 01 Feb 2021 04:03:48 +0100 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:127504 Archived-At: > Am handling a message passed in from an external process > (its passed in chunks). > > The header of the message specifies its length, in bytes. > Some of the characters may be unicode. Am using > buffer-substring-no-properties to later extract the message. > To get its length write, each byte has to be a character in the buffer. So make sure the buffer in which the process writes is unibyte with (set-buffer-multibyte nil) and make sure Emacs doesn't try to decode the process's output: (set-process-coding-system 'binary) (which you can also set directly when you launch the process, but how you do it depends on the function you use to create the process). Stefan