From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 43090 invoked by alias); 12 Jul 2019 14:43:40 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 43037 invoked by uid 89); 12 Jul 2019 14:43:40 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-2.5 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 spammy=houder, Houder, Specifying X-HELO: smtp-out-so.shaw.ca Received: from smtp-out-so.shaw.ca (HELO smtp-out-so.shaw.ca) (64.59.136.139) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 12 Jul 2019 14:43:37 +0000 Received: from [192.168.1.114] ([24.64.172.44]) by shaw.ca with ESMTP id lwlqh3U4GSrVclwlrhVpmL; Fri, 12 Jul 2019 08:43:36 -0600 Reply-To: Brian.Inglis@SystematicSw.ab.ca Subject: Re: Possible issue with gawk 5.0.1-1: Getting new warnings To: cygwin@cygwin.com References: From: Brian Inglis Openpgp: preference=signencrypt Message-ID: Date: Fri, 12 Jul 2019 14:43:00 -0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2019-07/txt/msg00097.txt.bz2 On 2019-07-12 04:47, Houder wrote: > On Thu, 11 Jul 2019 11:51:09, Vipul P wrote: >> Here is a sample script to invoke awk: >> $ cat ./gawk_error.sh >> #!/bin/sh >> echo "This:is:a:colon:separated:line:%%%:" | awk '{ >> gsub("\\%", "%25", $0); >> gsub("\\:", "%3A", $0); >> print >> }' > gsub(regexp, replacement[, target]) > echo "This:is:a:colon:separated:line:%%%:" | awk '{ > gsub(/%/, "%25"); > gsub(/:/, "%3A"); > print > }' >> If I invoke it with gawk 5.0.1-1, I see warnings as below: >> $ uname -a >> CYGWIN_NT-10.0 MyPC 3.0.7(0.338/5/3) 2019-04-30 18:08 x86_64 Cygwin >> $ awk -V >> GNU Awk 5.0.1, API: 2.0 (GNU MPFR 4.0.2, GNU MP 6.1.2) >> Copyright (C) 1989, 1991-2019 Free Software Foundation. >> $ ./gawk_error.sh >> awk: cmd. line:2: (FILENAME=- FNR=1) warning: regexp escape sequence `\%' >> is not a known regexp operator >> awk: cmd. line:3: (FILENAME=- FNR=1) warning: regexp escape sequence `\:' >> is not a known regexp operator >> This%3Ais%3Aa%3Acolon%3Aseparated%3Aline%3A%25%25%25%3A > I am not surprised to see these specific warnings ... > See 3.2 (escape sequences) of GAWK: Effective AWK programming. >> This script runs without any warnings with older versions of gawk: > https://cygwin.com/ml/cygwin/2019-04/msg00095.html > ( [ANNOUNCEMENT] gawk 5.0.0-1 ) >> The script runs without any warnings on Linux and other Unix variants. > Using version 5 of gawk? >> Is this a regression in gawk 5.0.1-1 on Cygwin ? > Not very likely, as Corinna V. uses the tarball provided by Arnold R. The first gsub argument is a regexp, so using a quoted string it must follow the rules for a computed regexp: either "%"/":" to match characters alone or "\\\\%"/"\\\\:" for characters preceded by backslash "\", as you wish. Specifying only a single backslash regexp /\x/ or double backslash string "\\x", the character must be a regexp special or it generates a warning message. $ awk '{gsub("%", "%25", $0);gsub(":", "%3A", $0);print}' \ <<< "This:is:a:colon:separated:line:%%%:" This%3Ais%3Aa%3Acolon%3Aseparated%3Aline%3A%25%25%25%3A $ awk '{gsub("\\\\%", "%25", $0);gsub("\\\\:", "%3A", $0);print}' \ <<< "This:is:a:colon:separated:line:%%%:" This:is:a:colon:separated:line:%%%: $ awk '{gsub(/%/, "%25", $0);gsub(/:/, "%3A", $0);print}' \ <<< "This:is:a:colon:separated:line:%%%:" This%3Ais%3Aa%3Acolon%3Aseparated%3Aline%3A%25%25%25%3A $ awk '{gsub(/\\%/, "%25", $0);gsub(/\\:/, "%3A", $0);print}' \ <<< "This:is:a:colon:separated:line:%%%:" This:is:a:colon:separated:line:%%%: -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple