From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: regex.c simplification Date: Fri, 20 Jul 2018 14:49:15 -0700 Organization: UCLA Computer Science Department Message-ID: <51d08f86-fe0c-4eb1-8b0b-7dadb0257c02@cs.ucla.edu> References: <83fu1mzq09.fsf@gnu.org> <30e30c9d-1e0d-ea7d-2ef5-ae8622875449@cs.ucla.edu> <7cc7d274-ee6a-ab14-c78a-4fdba963578b@cs.ucla.edu> <83va9a1jfz.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: blaine.gmane.org 1532123252 30164 195.159.176.226 (20 Jul 2018 21:47:32 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 20 Jul 2018 21:47:32 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 Cc: emacs-devel@gnu.org To: Eli Zaretskii , Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Jul 20 23:47:27 2018 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fgdFH-0007gw-LU for ged-emacs-devel@m.gmane.org; Fri, 20 Jul 2018 23:47:27 +0200 Original-Received: from localhost ([::1]:49930 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fgdHM-0001wz-Px for ged-emacs-devel@m.gmane.org; Fri, 20 Jul 2018 17:49:36 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:44451) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fgdHB-0001vg-F7 for emacs-devel@gnu.org; Fri, 20 Jul 2018 17:49:26 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fgdHA-0005jp-K6 for emacs-devel@gnu.org; Fri, 20 Jul 2018 17:49:25 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:36920) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fgdH4-0005c1-RZ; Fri, 20 Jul 2018 17:49:19 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id D07E8160F5E; Fri, 20 Jul 2018 14:49:16 -0700 (PDT) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id g5l8oVyhB2nz; Fri, 20 Jul 2018 14:49:16 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 1D125160F72; Fri, 20 Jul 2018 14:49:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id Za-tCvQywygF; Fri, 20 Jul 2018 14:49:16 -0700 (PDT) Original-Received: from Penguin.CS.UCLA.EDU (Penguin.CS.UCLA.EDU [131.179.64.200]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 001EF160F5E; Fri, 20 Jul 2018 14:49:15 -0700 (PDT) Openpgp: preference=signencrypt Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBfgQTAQIAKAUCTIByZAIbAwUJEswDAAYLCQgHAwIG FQgCCQoLBBYCAwECH In-Reply-To: <83va9a1jfz.fsf@gnu.org> Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 131.179.128.68 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:227598 Archived-At: On 07/19/2018 11:59 PM, Eli Zaretskii wrote: >> I was thinking of just always using the libc regexp code (whether it's >> GNU libc or something else). > Yes, that'd be a possibility. Do we have any supported platform that > does NOT have its own regexp code, whether in libc or as a separate > library? > Every POSIX-conforming platform has regexp code somewhere, using the POSIX API. However, I can see some trouble using that code: * Some of libc regex implementations have been reasonably buggy. Most GNU apps don't use these implementations any more so I'm not sure what their status is. * We may need to use an option like -lregex to get the system library implementation, and that would have to be configured. * Perhaps 'etags' users are using GNU extensions in their regular expressions, and if we switch to the libc API their usage will break. * You're the expert, but as far as I know MS-Windows does not support the POSIX API so presumably we'd have to provide a substitute anyway, for MS-Windows. * etags uses the GNU API so it would have to be changed to use the POSIX API.