From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Tomas Hlavaty Newsgroups: gmane.emacs.devel Subject: Re: Can watermarking Unicode text using invisible differences sneak through Emacs, or can Emacs detect it? Date: Sat, 05 Feb 2022 14:55:19 +0100 Message-ID: <8735kxe7ug.fsf@logand.com> References: <837dasntoj.fsf@gnu.org> <834k5tl4a9.fsf@gnu.org> <87mtjkt6m9.fsf@gmail.com> <83ilu8htws.fsf@gnu.org> <3E718CA2-889F-4AEE-B79C-EB3A221D1CB2@gnu.org> <83o83wc7gs.fsf@gnu.org> <8335l5brov.fsf@gnu.org> <83mtjc838i.fsf@gnu.org> <83zgna7hyd.fsf@gnu.org> <83ee4l78rw.fsf@gnu.org> <87ee4jhezi.fsf@logand.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12671"; mail-complaints-to="usenet@ciao.gmane.io" Cc: psainty@orcon.net.nz, luangruo@yahoo.com, eliz@gnu.org, kevin.legouguec@gmail.com, emacs-devel@gnu.org To: rms@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Feb 05 14:56:52 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 1nGLYa-00037M-QM for ged-emacs-devel@m.gmane-mx.org; Sat, 05 Feb 2022 14:56:52 +0100 Original-Received: from localhost ([::1]:58024 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nGLYZ-0007WM-6i for ged-emacs-devel@m.gmane-mx.org; Sat, 05 Feb 2022 08:56:51 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:46022) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nGLXJ-0006hQ-LW for emacs-devel@gnu.org; Sat, 05 Feb 2022 08:55:33 -0500 Original-Received: from logand.com ([37.48.87.44]:57054) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nGLXG-00009P-H9; Sat, 05 Feb 2022 08:55:32 -0500 Original-Received: by logand.com (Postfix, from userid 1001) id 56DA719EB18; Sat, 5 Feb 2022 14:55:21 +0100 (CET) X-Mailer: emacs 27.2 (via feedmail 11-beta-1 I) In-Reply-To: Received-SPF: pass client-ip=37.48.87.44; envelope-from=tom@logand.com; helo=logand.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, 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" Xref: news.gmane.io gmane.emacs.devel:285900 Archived-At: On Fri 04 Feb 2022 at 23:20, Richard Stallman wrote: > How can I tell which font my console uses? on debian based systems: dpkg-reconfigure console-setup ls /usr/share/consolefonts/ setfont /usr/share/consolefonts/Lat2-Terminus24x12.psf.gz sed -i 's/FONTFACE=3D"Fixed"/FONTFACE=3D"Terminus"/' /etc/default/console-s= etup sed -i 's/FONTSIZE=3D"8x16"/FONTSIZE=3D"28x14"/' /etc/default/console-setup setupcon on nixos: i18n.consoleFont =3D "Lat2-Terminus16"; setfont Lat2-Terminus24x12 > The Lisp function `char-displayable-p' seems to report correctly which > characters my console can display. Is it correct for yours too? Here the cases which I see as boxes: (char-displayable-p ?=C3=A3=C2=AF) =3D> (invalid-read-syntax "?") (char-displayable-p ?=C3=A3) =3D> unicode (char-displayable-p ?=C2=AF) =3D> unicode (char-displayable-p ?=C4=83) =3D> unicode (char-displayable-p ?=C3=A3=CB=98) =3D> (invalid-read-syntax "?") (char-displayable-p ?=C3=A3) =3D> unicode (char-displayable-p ?=CB=98) =3D> unicode char-displayable-p returns non-nil even though I see boxes.