From owner-svn-src-head@freebsd.org Thu Jul 30 03:53:44 2020 Return-Path: Delivered-To: svn-src-head@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id AC9D8376C9E; Thu, 30 Jul 2020 03:53:44 +0000 (UTC) (envelope-from lwhsu@freebsd.org) Received: from smtp.freebsd.org (smtp.freebsd.org [IPv6:2610:1c1:1:606c::24b:4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "smtp.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BHGjh41DTz4ffr; Thu, 30 Jul 2020 03:53:44 +0000 (UTC) (envelope-from lwhsu@freebsd.org) Received: from mail-yb1-f171.google.com (mail-yb1-f171.google.com [209.85.219.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) (Authenticated sender: lwhsu/mail) by smtp.freebsd.org (Postfix) with ESMTPSA id 684BE1A9DB; Thu, 30 Jul 2020 03:53:44 +0000 (UTC) (envelope-from lwhsu@freebsd.org) Received: by mail-yb1-f171.google.com with SMTP id c14so13728112ybj.0; Wed, 29 Jul 2020 20:53:44 -0700 (PDT) X-Gm-Message-State: AOAM530e8mD14GwWJrwfD+rIfE7sfgcEMS8lFxdckXPj9b41LfIKBK7K IRCbu9YYo8waLc5MRf35JLXuRdtuvknNBiWUrts= X-Google-Smtp-Source: ABdhPJygu0EUkCuhL5zIQUXFlVeoLC5G/UsLsi+rcA/ytgJ3Em6Y7xmQdVWzx+0AgfLA1KK7QbrwwM4MCx5huJjRzP0= X-Received: by 2002:a25:b1a5:: with SMTP id h37mr53960180ybj.241.1596081223622; Wed, 29 Jul 2020 20:53:43 -0700 (PDT) MIME-Version: 1.0 References: <202007292321.06TNLuoq087451@repo.freebsd.org> In-Reply-To: <202007292321.06TNLuoq087451@repo.freebsd.org> From: Li-Wen Hsu Date: Thu, 30 Jul 2020 11:53:32 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: svn commit: r363679 - in head: contrib/netbsd-tests/lib/libc/regex/data lib/libc/regex To: Kyle Evans Cc: src-committers , svn-src-all , svn-src-head Content-Type: text/plain; charset="UTF-8" X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 30 Jul 2020 03:53:44 -0000 On Thu, Jul 30, 2020 at 7:22 AM Kyle Evans wrote: > > Author: kevans > Date: Wed Jul 29 23:21:56 2020 > New Revision: 363679 > URL: https://svnweb.freebsd.org/changeset/base/363679 > > Log: > regex(3): Interpret many escaped ordinary characters as EESCAPE > > In IEEE 1003.1-2008 [1] and earlier revisions, BRE/ERE grammar allows for > any character to be escaped, but "ORD_CHAR preceded by an unescaped > character [gives undefined results]". > > Historically, we've interpreted an escaped ordinary character as the > ordinary character itself. This becomes problematic when some extensions > give special meanings to an otherwise ordinary character > (e.g. GNU's \b, \s, \w), meaning we may have two different valid > interpretations of the same sequence. > > To make this easier to deal with and given that the standard calls this > undefined, we should throw an error (EESCAPE) if we run into this scenario > to ease transition into a state where some escaped ordinaries are blessed > with a special meaning -- it will either error out or have extended > behavior, rather than have two entirely different versions of undefined > behavior that leave the consumer of regex(3) guessing as to what behavior > will be used or leaving them with false impressions. > > This change bumps the symbol version of regcomp to FBSD_1.6 and provides the > old escape semantics for legacy applications, just in case one has an older > application that would immediately turn into a pumpkin because of an > extraneous escape that's embehttps://ci.freebsd.org/job/FreeBSD-head-amd64-test/16011/testReport/junit/lib.googletest.gtest_main/googletest-port-test/main/dded or otherwise critical to its operation. > > This is the final piece needed before enhancing libregex with GNU extensions > and flipping the switch on bsdgrep. > > [1] http://pubs.opengroup.org/onlinepubs/9699919799.2016edition/ > > PR: 229925 (exp-run, courtesy of antoine) > Differential Revision: https://reviews.freebsd.org/D10510 > > Modified: > head/contrib/netbsd-tests/lib/libc/regex/data/meta.in > head/contrib/netbsd-tests/lib/libc/regex/data/subexp.in > head/lib/libc/regex/Symbol.map > head/lib/libc/regex/regcomp.c I think there are 3 test cases need to be modified after this change: https://ci.freebsd.org/job/FreeBSD-head-amd64-test/16011/testReport/junit/lib.googletest.gtest_main/googletest-port-test/main/ https://ci.freebsd.org/job/FreeBSD-head-amd64-test/16011/testReport/junit/usr.bin.diff/diff_test/side_by_side/ https://ci.freebsd.org/job/FreeBSD-head-amd64-test/16011/testReport/junit/usr.bin.sed/sed2_test/hex_subst/ Please help to check them, thanks! Li-Wen