Paul Eggert <eggert@HIDDEN>
to control <at> debbugs.gnu.org.
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[109.12.232.152]) by smtp.googlemail.com with ESMTPSA id d2-v6sm6692589edd.55.2018.09.17.08.56.51 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 17 Sep 2018 08:56:52 -0700 (PDT) From: 21naown@HIDDEN X-Google-Original-From: 21Naown@HIDDEN Subject: Re: bug#32704: Can grep search for a line feed and a null character at the same time? To: 32704 <at> debbugs.gnu.org, Assaf Gordon <assafgordon@HIDDEN>, Eric Blake <eblake@HIDDEN>, Paul Eggert <eggert@HIDDEN> References: <7c837f78-a794-94e7-0562-bc768b0213ac@HIDDEN> <f6d5340c-5e7c-d299-af8b-a2751b49eb52@HIDDEN> <a79681fb-9aa7-6a27-010d-e8582e7ed5cc@HIDDEN> <fd8f5f0e-79eb-351f-dd28-31fd4b23c57b@HIDDEN> <7b844c92-d352-c8d5-6d55-a27246dcbdbf@HIDDEN> <be2e1860-d6f8-b54c-3b3d-bff59d0d67cb@HIDDEN> <9715a94b-5173-df57-1991-76e3a75c2362@HIDDEN> <31e7f84e-eac8-8f63-fe94-b46071bf6c74@HIDDEN> Message-ID: <e7676fa5-fe29-37f5-655f-c95259d6af3e@HIDDEN> Date: Mon, 17 Sep 2018 17:56:52 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <31e7f84e-eac8-8f63-fe94-b46071bf6c74@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-GB X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 32704 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Hello Assaf. Thank you Assaf and Eric for your suggestions. I will also look at the tool “pcregrep”. -------------------------------------------------------------------------------- Thank you Eric for having answered the question of the subject: Le 15/09/2018 à 22:27, Eric Blake a écrit : > On 9/15/18 12:57 PM, 21naown@HIDDEN wrote: > >> So it is possible to find “\x0A\x00” alone, but for example >> “\x74\x00\x0D\x00\x0A\x00\x74\x00\x65\00” is impossible to find with >> the “-P” option? > > Correct. It is impossible to find the record terminator in the middle > of a pattern, whether that terminator is \n (default) or NUL (-z). It > is therefore impossible to find a multi-record match using grep. The > string you listed contains both \x00 and \x0a, so regardless of which > of those two bytes you pick as the record terminator, it is impossible > to use grep to find that substring in your file. You'll have to > resort to a tool that supports multiline matching, since grep is not > such a tool.
bug-grep@HIDDEN:bug#32704; Package grep.
Full text available.Received: (at 32704) by debbugs.gnu.org; 15 Sep 2018 20:27:19 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Sep 15 16:27:19 2018 Received: from localhost ([127.0.0.1]:41791 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1g1H9z-0006Wf-1L for submit <at> debbugs.gnu.org; Sat, 15 Sep 2018 16:27:19 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34218) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eblake@HIDDEN>) id 1g1H9w-0006WS-9z for 32704 <at> debbugs.gnu.org; Sat, 15 Sep 2018 16:27:16 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5C2093082137; Sat, 15 Sep 2018 20:27:10 +0000 (UTC) Received: from [10.10.122.46] (ovpn-122-46.rdu2.redhat.com [10.10.122.46]) by smtp.corp.redhat.com (Postfix) with ESMTP id B29F44505; Sat, 15 Sep 2018 20:27:09 +0000 (UTC) Subject: Re: bug#32704: Can grep search for a line feed and a null character at the same time? To: 21naown@HIDDEN, 32704 <at> debbugs.gnu.org, Paul Eggert <eggert@HIDDEN> References: <7c837f78-a794-94e7-0562-bc768b0213ac@HIDDEN> <f6d5340c-5e7c-d299-af8b-a2751b49eb52@HIDDEN> <a79681fb-9aa7-6a27-010d-e8582e7ed5cc@HIDDEN> <fd8f5f0e-79eb-351f-dd28-31fd4b23c57b@HIDDEN> <7b844c92-d352-c8d5-6d55-a27246dcbdbf@HIDDEN> <be2e1860-d6f8-b54c-3b3d-bff59d0d67cb@HIDDEN> <9715a94b-5173-df57-1991-76e3a75c2362@HIDDEN> From: Eric Blake <eblake@HIDDEN> Organization: Red Hat, Inc. Message-ID: <31e7f84e-eac8-8f63-fe94-b46071bf6c74@HIDDEN> Date: Sat, 15 Sep 2018 15:27:08 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <9715a94b-5173-df57-1991-76e3a75c2362@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Sat, 15 Sep 2018 20:27:10 +0000 (UTC) X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: 32704 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -6.0 (------) On 9/15/18 12:57 PM, 21naown@HIDDEN wrote: >>> But is it at least possible to find “\x0A\x00” with grep? >> >> If you bend the rules by throwing -P into the mix, yes :) >> > So it is possible to find “\x0A\x00” alone, but for example > “\x74\x00\x0D\x00\x0A\x00\x74\x00\x65\00” is impossible to find with the > “-P” option? Correct. It is impossible to find the record terminator in the middle of a pattern, whether that terminator is \n (default) or NUL (-z). It is therefore impossible to find a multi-record match using grep. The string you listed contains both \x00 and \x0a, so regardless of which of those two bytes you pick as the record terminator, it is impossible to use grep to find that substring in your file. You'll have to resort to a tool that supports multiline matching, since grep is not such a tool. It IS possible, of course, to change your data, for example: tr '\0' '\xff' < file | grep $modified_pattern | tr '\xff' '\0' assuming that \xff didn't appear anywhere else in the file; although it may make matching harder if you don't have the right record terminators any longer. Or, if your input data is encoded in UTF-16, it's easiest to convert it into UTF-8 for the grep: iconv -f UTF-16 -t UTF-8 < file | grep $modified_pattern \ | iconv -f UTF-8 -t UTF-16 -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
bug-grep@HIDDEN:bug#32704; Package grep.
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Subject: Re: bug#32704: Can grep search for a line feed and a null character
at the same time?
To: 21naown@HIDDEN, 32704 <at> debbugs.gnu.org, Eric Blake <eblake@HIDDEN>,
Paul Eggert <eggert@HIDDEN>
References: <7c837f78-a794-94e7-0562-bc768b0213ac@HIDDEN>
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From: Assaf Gordon <assafgordon@HIDDEN>
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Date: Sat, 15 Sep 2018 14:20:40 -0600
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Hello,
On 15/09/18 11:57 AM, 21naown@HIDDEN wrote:
> Le 15/09/2018 à 19:06, Eric Blake a écrit :
>> On 9/15/18 11:43 AM, 21naown@HIDDEN wrote:
>>> But is it at least possible to find “\x0A\x00” with grep?
>>
>> If you bend the rules by throwing -P into the mix, yes :)
>>
> So it is possible to find “\x0A\x00” alone, but for example
> “\x74\x00\x0D\x00\x0A\x00\x74\x00\x65\00” is impossible to find with the
> “-P” option?
If I may suggest a different tool, GNU sed can handle such regexes more
easily than grep.
The 'trick' is to accumulate multiple lines into memory, then run the
regex on the entire buffer.
1.
If you input is small enough to fit in memory,
you can load the entire file into memory,
and run the regex on the buffer:
$ printf
'\xFF\xFE\x0D\x00\x0A\x00\x74\x00\x65\x00\x73\x00\x74\x00\x0D\x00\x0A\x00\x74\x00\x65\x00\x73\x00\x74\x00\x5F\x00\x74\x00\x77\x00\x6F\x00\x0D\x00\x0A\x00'
\
| LC_ALL=C sed -n 'H;$!d ; x ; /\x0a\x00/q0 ; q1' \
&& echo MATCH || echo NO-MATCH
The "H;$!d" commands accumulate lines into the hold buffer.
The "x" command copies the hold buffer into the pattern buffer.
Then the regex "/\x0a\x00/" searches in the buffer.
If there was a match, sed quits with exit code 0 ("q0").
Otherwise, sed quits with exit code 1 ("q1").
2.
If the file is too big to fit in memory,
you can process it line-by-line like so:
$ printf
'\xFF\xFE\x0D\x00\x0A\x00\x74\x00\x65\x00\x73\x00\x74\x00\x0D\x00\x0A\x00\x74\x00\x65\x00\x73\x00\x74\x00\x5F\x00\x74\x00\x77\x00\x6F\x00\x0D\x00\x0A\x00'
\
| LC_ALL=C sed -n 'N;/\x00\x0a/q0;$q1;D;' \
&& echo MATCH || echo NO-MATCH
The N,D commands work in tandem to append the next line into the
buffer, then delete the last line from the buffer (think FIFO).
The regex then operates on the buffer which contains the last two lines.
More details are in the manual:
https://www.gnu.org/software/sed/manual/sed.html#Multiline-techniques
https://www.gnu.org/software/sed/manual/sed.html#Text-search-across-multiple-lines
regards,
- assaf
bug-grep@HIDDEN:bug#32704; Package grep.
Full text available.Received: (at 32704) by debbugs.gnu.org; 15 Sep 2018 17:57:30 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Sep 15 13:57:29 2018 Received: from localhost ([127.0.0.1]:41761 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1g1Eoz-0002jh-Lw for submit <at> debbugs.gnu.org; Sat, 15 Sep 2018 13:57:29 -0400 Received: from mail-wm1-f50.google.com ([209.85.128.50]:37310) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <21naown@HIDDEN>) id 1g1Eoy-0002jV-Ao for 32704 <at> debbugs.gnu.org; Sat, 15 Sep 2018 13:57:28 -0400 Received: by mail-wm1-f50.google.com with SMTP id n11-v6so5177625wmc.2 for <32704 <at> debbugs.gnu.org>; Sat, 15 Sep 2018 10:57:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:subject:to:references:message-id:date:user-agent:mime-version :in-reply-to:content-transfer-encoding:content-language; bh=yK8jn4TqF+CQuwUDhzBnrpyAHvlvHU/oX0y+JFHiuDk=; b=UGb0x/vxX+jaKNI4X5zco31ylkx31GqgVMZGZpnPwAJV2hd0DAQ5jG/KGzkwXbC52X 4tbO+B4c+I3XV+KsIr16KNyni1JPYR0fjYTkVa1AY8G8wrLp3NAnmCGPVkj0VA/NL13A aw4U4rP1qR81HHAog1nnYvTdOOKNLRInhyH3cieHnAotOn+uZJvGIfAFh6JYcTEoCKUo fRiDH3qpw5sW97NIcnm4S6sGoWLIXyn7ZSt2MUBB5qtycU7s5RoM7TsNJVFwLEBXFWHZ OozC0fDXLYsBO6eeR4n/2BjFO5dcED2Zk6qXfhziJ0YGK9GGAb+N+kXnBq2Jvquk6BQm wUGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:subject:to:references:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=yK8jn4TqF+CQuwUDhzBnrpyAHvlvHU/oX0y+JFHiuDk=; b=qHHXnfhObVsnpFfTs5MNogx97C+NdTzqtbfAYw3PRxyzBrt8rRKvy+thZ++wQ2rirj DmutC+p62lKbGvkzJR686b5J7lAbROHwbMOfsuJ/TYWRfz9wNCkK0HyU2/s2lxZEA4oc 8ysY/+n30bF7WV/rqnuZJ729piGkm5QxSc3OzQIcQ4ViJwQQjOnnajgXveGGsXPCGZ5T 1gCIdueuE1LpMHUy9Ct1GQjDFnsFYCyvHhPjvPwZ04zz8xPKf6KqkxZkmOjm83cnPKrS Ie733RTfl/9HQTiNtpmQmDfp8peuQjMgA69DXImS7H2PIj9GkAGSrQEbv7ENXfhvObS5 q4vQ== X-Gm-Message-State: APzg51CSWD0SHjRprrn8XRnBhVJL24T8EbavFJdQadzhyHht/xGtwxZ4 2m8DmaZzkjVz/Eb4Db3ruEc= X-Google-Smtp-Source: ANB0VdZX9b4ICnsVSMPnu0C6OSaQ9t+ImTb7IeQICNDXBXaj+yqQ6LNhiwH+VlZ3Cc/Owdaj7+O2mQ== X-Received: by 2002:a1c:938a:: with SMTP id v132-v6mr5762290wmd.114.1537034242449; Sat, 15 Sep 2018 10:57:22 -0700 (PDT) Received: from [192.168.1.2] (152.232.12.109.rev.sfr.net. [109.12.232.152]) by smtp.googlemail.com with ESMTPSA id 1-v6sm5691302wmf.47.2018.09.15.10.57.21 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 15 Sep 2018 10:57:22 -0700 (PDT) From: 21naown@HIDDEN X-Google-Original-From: 21Naown@HIDDEN Subject: Re: bug#32704: Can grep search for a line feed and a null character at the same time? To: 32704 <at> debbugs.gnu.org, Eric Blake <eblake@HIDDEN>, Paul Eggert <eggert@HIDDEN> References: <7c837f78-a794-94e7-0562-bc768b0213ac@HIDDEN> <f6d5340c-5e7c-d299-af8b-a2751b49eb52@HIDDEN> <a79681fb-9aa7-6a27-010d-e8582e7ed5cc@HIDDEN> <fd8f5f0e-79eb-351f-dd28-31fd4b23c57b@HIDDEN> <7b844c92-d352-c8d5-6d55-a27246dcbdbf@HIDDEN> <be2e1860-d6f8-b54c-3b3d-bff59d0d67cb@HIDDEN> Message-ID: <9715a94b-5173-df57-1991-76e3a75c2362@HIDDEN> Date: Sat, 15 Sep 2018 19:57:24 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <be2e1860-d6f8-b54c-3b3d-bff59d0d67cb@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-GB X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 32704 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Le 15/09/2018 à 19:06, Eric Blake a écrit : > On 9/15/18 11:43 AM, 21naown@HIDDEN wrote: >> Thank you for your messages. >> >> It is possible I did not understand correctly your messages, because >> grep finds hex sequences with the “-Pa” options at least. > > grep -P introduces a completely different regex engine, with its own > quirks. As such, it does introduce different rules on backslash > sequences accepted. > >> >> Examples—“input.txt” contains, from the file system, for example >> “\xFF\xFE\x0D\x00\x0A\x00\x74\x00\x65\x00\x73\x00\x74\x00\x0D\x00\x0A\x00\x74\x00\x65\x00\x73\x00\x74\x00\x5F\x00\x74\x00\x77\x00\x6F\x00\x0D\x00\x0A\x00”: >> >> grep -Pa '\x00' input.txt >> → found >> grep -Pza '\x0A' input.txt >> → found >> grep -Pa '\x0A\x00' input.txt > > This will never match - when you are not using -z, there are no \x0A > in the input stream (they have all been consumed by grep parsing one > line at a time, ending at \x0A). Instead, you'll want to search for > '^\x00' or '\x00$' for a pattern anchored to a line transition, to > find patterns where newline was next to NUL. > >> grep -Pza '\x0A\x00' input.txt >> → not found for the both > > Similarly, when you are using -z, there are no \x00 in the input > stream (they have all been consumed by grep parsing one > NUL-terminated record at a time, ending at \x00). Instead, you'll > want to search for '^\x0a' or '\x0a$' for a pattern anchored to a > record transition, to find patterns where newline was next to NUL. > >> >> But is it at least possible to find “\x0A\x00” with grep? > > If you bend the rules by throwing -P into the mix, yes :) > So it is possible to find “\x0A\x00” alone, but for example “\x74\x00\x0D\x00\x0A\x00\x74\x00\x65\00” is impossible to find with the “-P” option?
bug-grep@HIDDEN:bug#32704; Package grep.
Full text available.Received: (at 32704) by debbugs.gnu.org; 15 Sep 2018 17:43:21 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Sep 15 13:43:21 2018 Received: from localhost ([127.0.0.1]:41757 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1g1EbJ-0002P9-6K for submit <at> debbugs.gnu.org; Sat, 15 Sep 2018 13:43:21 -0400 Received: from mail-ed1-f52.google.com ([209.85.208.52]:42112) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <21naown@HIDDEN>) id 1g1Dfg-0000vK-1K for 32704 <at> debbugs.gnu.org; Sat, 15 Sep 2018 12:43:48 -0400 Received: by mail-ed1-f52.google.com with SMTP id l5so9733446edw.9 for <32704 <at> debbugs.gnu.org>; Sat, 15 Sep 2018 09:43:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:subject:to:references:message-id:date:user-agent:mime-version :in-reply-to:content-transfer-encoding:content-language; bh=cl4y83Cezqr1cEY5qmAwLmRf80uhZNBnfQvmKC3czGk=; b=ihxoW/wRLx3AP46YRlGrnq+uIM+edWBt1Nv0yQH/8TNsmSQgDbvmSeCOm0V5f8GZo3 a5ftig228Sda1POTzAfRGzEm1trvbJ7rIZhkUymkP9+SQHUDtKljmczB37IiA9UA4W13 vPHbdBBESQiF5znIn4dYbR79ypdtCByfYtV1ukQtsFNHVkcheaV3k1wwUc/qejf1ZbeY x6Lg02pFXD48nfixAtzXaAr0G7R+SOnpvjr5o21b34kyWkiqjSvCbcpvcX7YYKWWP9su GzCEChwdR74/LC9xi//7JXbMxhTs6RwbE1AWUMvvq2D0pRmSLgoZorIDAAg/9VDdxe1Y 03Sg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:subject:to:references:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=cl4y83Cezqr1cEY5qmAwLmRf80uhZNBnfQvmKC3czGk=; b=tpqihwJNB5B2Mj0IjwFnhYY77dzwggDtoeEkzVoaDmwR9B3EOiENFZG8G1fZlEGGIL 1YnR8PxN+PaW3fQ69HKLE3u+bGruQc6HjcPwCfQN3u1uZASciOLomdiDwn6BRjoec2Bq OZ6M0tFV2qnqrIxMowAKe4jRGlE/yIwNHb2Tjez1ihSqA7Hm3VbLLhCbBrNLuKWeW8i4 uUMHELZD1Yy7o8brl65BL1CDnBZrtbfe+vJQmvQ4nkJS33hF51KOwAq/pL+rltKU3os/ BvSsZwxA4wBPVxDU6WR9L99Awpuq7DbJE/seFcAjO/9VUKyuGGKBnDA8xHa06jC/mQRZ UPAw== X-Gm-Message-State: APzg51D3c92uuwaPxhSuGsbn48fG+VrRd0WtFH5y8O22HA8YhIIeZvjX 5MEIwzmTE8AhiE8YPUzMGoI= X-Google-Smtp-Source: ANB0VdbekQmKtUQpT5NEKpAYF2ePck0w9KtI0gyC+mAKEth8VTRr2i09F0WYFvEuBhsPDEL/Nuct0g== X-Received: by 2002:a50:bc03:: with SMTP id j3-v6mr30220457edh.34.1537029822249; Sat, 15 Sep 2018 09:43:42 -0700 (PDT) Received: from [192.168.1.2] (152.232.12.109.rev.sfr.net. [109.12.232.152]) by smtp.googlemail.com with ESMTPSA id h3-v6sm5034792ede.42.2018.09.15.09.43.41 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 15 Sep 2018 09:43:41 -0700 (PDT) From: 21naown@HIDDEN X-Google-Original-From: 21Naown@HIDDEN Subject: Re: bug#32704: Can grep search for a line feed and a null character at the same time? To: 32704 <at> debbugs.gnu.org, Eric Blake <eblake@HIDDEN>, Paul Eggert <eggert@HIDDEN> References: <7c837f78-a794-94e7-0562-bc768b0213ac@HIDDEN> <f6d5340c-5e7c-d299-af8b-a2751b49eb52@HIDDEN> <a79681fb-9aa7-6a27-010d-e8582e7ed5cc@HIDDEN> <fd8f5f0e-79eb-351f-dd28-31fd4b23c57b@HIDDEN> Message-ID: <7b844c92-d352-c8d5-6d55-a27246dcbdbf@HIDDEN> Date: Sat, 15 Sep 2018 18:43:44 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <fd8f5f0e-79eb-351f-dd28-31fd4b23c57b@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-GB X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 32704 X-Mailman-Approved-At: Sat, 15 Sep 2018 13:43:19 -0400 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Thank you for your messages. It is possible I did not understand correctly your messages, because grep finds hex sequences with the “-Pa” options at least. Examples—“input.txt” contains, from the file system, for example “\xFF\xFE\x0D\x00\x0A\x00\x74\x00\x65\x00\x73\x00\x74\x00\x0D\x00\x0A\x00\x74\x00\x65\x00\x73\x00\x74\x00\x5F\x00\x74\x00\x77\x00\x6F\x00\x0D\x00\x0A\x00”: grep -Pa '\x00' input.txt → found grep -Pza '\x0A' input.txt → found grep -Pa '\x0A\x00' input.txt grep -Pza '\x0A\x00' input.txt → not found for the both But is it at least possible to find “\x0A\x00” with grep?
bug-grep@HIDDEN:bug#32704; Package grep.
Full text available.Received: (at 32704) by debbugs.gnu.org; 15 Sep 2018 17:06:56 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Sep 15 13:06:56 2018 Received: from localhost ([127.0.0.1]:41751 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1g1E24-0001VW-6W for submit <at> debbugs.gnu.org; Sat, 15 Sep 2018 13:06:56 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45030) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eblake@HIDDEN>) id 1g1E22-0001VK-Dj for 32704 <at> debbugs.gnu.org; Sat, 15 Sep 2018 13:06:54 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B592C3082144; Sat, 15 Sep 2018 17:06:48 +0000 (UTC) Received: from [10.10.122.46] (ovpn-122-46.rdu2.redhat.com [10.10.122.46]) by smtp.corp.redhat.com (Postfix) with ESMTP id 15E17703BB; Sat, 15 Sep 2018 17:06:47 +0000 (UTC) Subject: Re: bug#32704: Can grep search for a line feed and a null character at the same time? To: 21naown@HIDDEN, 32704 <at> debbugs.gnu.org, Paul Eggert <eggert@HIDDEN> References: <7c837f78-a794-94e7-0562-bc768b0213ac@HIDDEN> <f6d5340c-5e7c-d299-af8b-a2751b49eb52@HIDDEN> <a79681fb-9aa7-6a27-010d-e8582e7ed5cc@HIDDEN> <fd8f5f0e-79eb-351f-dd28-31fd4b23c57b@HIDDEN> <7b844c92-d352-c8d5-6d55-a27246dcbdbf@HIDDEN> From: Eric Blake <eblake@HIDDEN> Organization: Red Hat, Inc. Message-ID: <be2e1860-d6f8-b54c-3b3d-bff59d0d67cb@HIDDEN> Date: Sat, 15 Sep 2018 12:06:47 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <7b844c92-d352-c8d5-6d55-a27246dcbdbf@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Sat, 15 Sep 2018 17:06:48 +0000 (UTC) X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: 32704 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -6.0 (------) On 9/15/18 11:43 AM, 21naown@HIDDEN wrote: > Thank you for your messages. > > It is possible I did not understand correctly your messages, because > grep finds hex sequences with the “-Pa” options at least. grep -P introduces a completely different regex engine, with its own quirks. As such, it does introduce different rules on backslash sequences accepted. > > Examples—“input.txt” contains, from the file system, for example > “\xFF\xFE\x0D\x00\x0A\x00\x74\x00\x65\x00\x73\x00\x74\x00\x0D\x00\x0A\x00\x74\x00\x65\x00\x73\x00\x74\x00\x5F\x00\x74\x00\x77\x00\x6F\x00\x0D\x00\x0A\x00”: > > grep -Pa '\x00' input.txt > → found > grep -Pza '\x0A' input.txt > → found > grep -Pa '\x0A\x00' input.txt This will never match - when you are not using -z, there are no \x0A in the input stream (they have all been consumed by grep parsing one line at a time, ending at \x0A). Instead, you'll want to search for '^\x00' or '\x00$' for a pattern anchored to a line transition, to find patterns where newline was next to NUL. > grep -Pza '\x0A\x00' input.txt > → not found for the both Similarly, when you are using -z, there are no \x00 in the input stream (they have all been consumed by grep parsing one NUL-terminated record at a time, ending at \x00). Instead, you'll want to search for '^\x0a' or '\x0a$' for a pattern anchored to a record transition, to find patterns where newline was next to NUL. > > But is it at least possible to find “\x0A\x00” with grep? If you bend the rules by throwing -P into the mix, yes :) -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
bug-grep@HIDDEN:bug#32704; Package grep.
Full text available.Received: (at 32704) by debbugs.gnu.org; 11 Sep 2018 17:40:02 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Sep 11 13:40:02 2018 Received: from localhost ([127.0.0.1]:37336 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1fzmdu-0001jV-D0 for submit <at> debbugs.gnu.org; Tue, 11 Sep 2018 13:40:02 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:56812 helo=mx1.redhat.com) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eblake@HIDDEN>) id 1fzmds-0001iy-JJ for 32704 <at> debbugs.gnu.org; Tue, 11 Sep 2018 13:40:01 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2899F4023337; Tue, 11 Sep 2018 17:39:55 +0000 (UTC) Received: from [10.10.122.46] (ovpn-122-46.rdu2.redhat.com [10.10.122.46]) by smtp.corp.redhat.com (Postfix) with ESMTP id B96B72157F49; Tue, 11 Sep 2018 17:39:54 +0000 (UTC) Subject: Re: bug#32704: Can grep search for a line feed and a null character at the same time? To: Paul Eggert <eggert@HIDDEN>, 21naown@HIDDEN, 32704 <at> debbugs.gnu.org References: <7c837f78-a794-94e7-0562-bc768b0213ac@HIDDEN> <f6d5340c-5e7c-d299-af8b-a2751b49eb52@HIDDEN> <a79681fb-9aa7-6a27-010d-e8582e7ed5cc@HIDDEN> From: Eric Blake <eblake@HIDDEN> Organization: Red Hat, Inc. Message-ID: <fd8f5f0e-79eb-351f-dd28-31fd4b23c57b@HIDDEN> Date: Tue, 11 Sep 2018 12:39:54 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <a79681fb-9aa7-6a27-010d-e8582e7ed5cc@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Tue, 11 Sep 2018 17:39:55 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Tue, 11 Sep 2018 17:39:55 +0000 (UTC) for IP:'10.11.54.6' DOMAIN:'int-mx06.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'eblake@HIDDEN' RCPT:'' X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 32704 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) On 9/11/18 12:14 PM, Paul Eggert wrote: > On 9/11/18 10:03 AM, Eric Blake wrote: >> maybe we really do have a bug - when -z is in effect, I'd expect NUL, >> rather than newline, to be the byte that separates separate patterns >> in the pattern argument > > You're right, I think it's a bug that grep -zf FILE uses newline > separators in FILE. It should use NUL separators. > > This cannot be done for NUL bytes in command-line patterns, though, > since command-line arguments cannot contain NUL bytes. Indeed. But that merely means that on the command line, when -z is in effect, you can't specify multiple patterns (but instead have to use -f FILE if that's what you really want). Meanwhile, the effect on being able to match a literal newline would be observable from either the command line or -f FILE. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
bug-grep@HIDDEN:bug#32704; Package grep.
Full text available.Received: (at 32704) by debbugs.gnu.org; 11 Sep 2018 17:15:01 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Sep 11 13:15:01 2018 Received: from localhost ([127.0.0.1]:37323 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1fzmFh-000162-0q for submit <at> debbugs.gnu.org; Tue, 11 Sep 2018 13:15:01 -0400 Received: from zimbra.cs.ucla.edu ([131.179.128.68]:34084) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eggert@HIDDEN>) id 1fzmFf-00015k-0q for 32704 <at> debbugs.gnu.org; Tue, 11 Sep 2018 13:14:59 -0400 Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id DFE031616F0; Tue, 11 Sep 2018 10:14:52 -0700 (PDT) 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 2DnU9LE8Kuwq; Tue, 11 Sep 2018 10:14:52 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 37A901616F1; Tue, 11 Sep 2018 10:14:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu 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 rL6WRVoI88Xn; Tue, 11 Sep 2018 10:14:52 -0700 (PDT) Received: from Penguin.CS.UCLA.EDU (Penguin.CS.UCLA.EDU [131.179.64.200]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 1C9261616F0; Tue, 11 Sep 2018 10:14:52 -0700 (PDT) Subject: Re: bug#32704: Can grep search for a line feed and a null character at the same time? To: Eric Blake <eblake@HIDDEN>, 21naown@HIDDEN, 32704 <at> debbugs.gnu.org References: <7c837f78-a794-94e7-0562-bc768b0213ac@HIDDEN> <f6d5340c-5e7c-d299-af8b-a2751b49eb52@HIDDEN> From: Paul Eggert <eggert@HIDDEN> Openpgp: preference=signencrypt Autocrypt: addr=eggert@HIDDEN; 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 FQgCCQoLBBYCAwECHgECF4AACgkQ7ZfpDmKqfjRRGw/+Ij03dhYfYl/gXVRiuzV1gGrbHk+t nfrI/C7fAeoFzQ5tVgVinShaPkZo0HTPf18x6IDEdAiO8Mqo1yp0CtHmzGMCJ50o4Grgfjlr 6g/+vtEOKbhleszN2XpJvpwM2QgGvn/laTLUu8PH9aRWTs7qJJZKKKAb4sxYc92FehPu6FOD 0dDiyhlDAq4lOV2mdBpzQbiojoZzQLMQwjpgCTK2572eK9EOEQySUThXrSIz6ASenp4NYTFH s9tuJQvXk9gZDdPSl3bp+47dGxlxEWLpBIM7zIONw4ks4azgT8nvDZxA5IZHtvqBlJLBObYY 0Le61Wp0y3TlBDh2qdK8eYL426W4scEMSuig5gb8OAtQiBW6k2sGUxxeiv8ovWu8YAZgKJfu oWI+uRnMEddruY8JsoM54KaKvZikkKs2bg1ndtLVzHpJ6qFZC7QVjeHUh6/BmgvdjWPZYFTt N+KA9CWX3GQKKgN3uu988yznD7LnB98T4EUH1HA/GnfBqMV1gpzTvPc4qVQinCmIkEFp83zl +G5fCjJJ3W7ivzCnYo4KhKLpFUm97okTKR2LW3xZzEW4cLSWO387MTK3CzDOx5qe6s4a91Zu ZM/j/TQdTLDaqNn83kA4Hq48UHXYxcIh+Nd8k/3w6lFuoK0wrOFiywjLx+0ur5jmmbecBGHc 1xdhAFHOwU0ETIByZAEQAKaF678T9wyH4wjTrV1Pz3cDEoSnV/0ZUrOT37p1dcGyj/IXq1x6 70HRVahAmk0sZpYc25PF9D5GPYHFWlNjuPU96rDndXB3hedmBRhLdC4bAXjI4DV+bmdVe+q/ IMnlZRaVlm9EiMCVAR6w13sReu7qXkW9r3RwY2AzXskp/tAe4BRKr1Zmbvi2nbnQ6epEC42r Rbx0B1EhjbIQZ5JHGk24iPT7LdBgnNmos5wYjzwNlkMQD5T0Ydzhk7J+UxwA5m46mOhRDC2r FV/A0gm5TLy8DXjv/Esc4gYnYai6SQqnUEVh5LuV8YCJBnijs+Tiw71x1icmn6xGI45EugJO gec+rLypYgpVp4x0HI5T88qBRYCkxH3Kg8Qo+EWNA9A4LRQ9DX8njona0gf0s03tocK8kBN6 6UoqqPtHBnc4eMgBymCflK12eKfd2YYxnyg9cZazWA5VslvTxpm76hbg5oiAEH/Vg/8MxHyA nPhfrgwyPrmJEcVBafdspJnYQxBYNco2LFPIhlOvWh8r4at+s+M3Lb26oUTczlgdW1Sf3SDA 77BMRnF0FQyE+7AzV79MBN4ykiqaezQxtaF1Fy/tvkhffSo8u+dwG0EgJh+te38gTcISVr0G IPplLz6YhjrbHrPRF1CN5UuL9DBGjxuN35RLNVEfta6RUFlR6NctTjvrABEBAAHCwWUEGAEC AA8FAkyAcmQCGwwFCRLMAwAACgkQ7ZfpDmKqfjSrHA/+KzAKvTxRhA9MWNLxIyJ7S5uJ16gs T3oCjZrBKGEhKMOGX4O0GA6VOEryO7QRCCYah3oxSG38IAnNeiwJXgU9Bzkk85UGbPEd7HGF /VSeHCQwWou6jqUDTSDvn9YhNTdG0KXPM74aC+xr2Zow1O2mhXihgWKD0Dw+0LYPnUOsQ0KO FxHXXYHmRrS1OZPU59BLvc+TRhIhafSHKLwbXK+6ckkxBx6h8z5ccpG0Qs4bFhdFYnFrEieD LoGmnE2YLhdV6swJ9VNCS6pLiEohT3fm7aXm15tZOIyzMZhHRSAPblXxQ0ZSWjq8oRrcYNFx c4W1URpAkBCOYJoXvQfD5L3lqAl8TCqDUzYxhH/tJhbDdHrqHH767jaDaTB1+Talp/2AMKwc XNOdiklGxbmHVG6YGl6g8Lrbsu9NZEI4yLlHzuikthJWgz+3vZhVGyNlt+HNIoF6CjDL2omu 5cEq4RDHM44QqPk6l7O0pUvN1mT4B+S1b08RKpqm/ff015E37HNV/piIvJlxGAYz8PSfuGCB 1thMYqlmgdhd9/BabGFbGGYHA6U4/T5zqU+f6xHy1SsAQZ1MSKlLwekBIT+4/cLRGqCHjnV0 q5H/T6a7t5mPkbzSrOLSo4puj+IToNjYyYIDBWzhlA19avOa+rvUjmHtD3sFN7cXWtkGoi8b uNcby4U= Organization: UCLA Computer Science Department Message-ID: <a79681fb-9aa7-6a27-010d-e8582e7ed5cc@HIDDEN> Date: Tue, 11 Sep 2018 10:14:51 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <f6d5340c-5e7c-d299-af8b-a2751b49eb52@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 32704 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) On 9/11/18 10:03 AM, Eric Blake wrote: > maybe we really do have a bug - when -z is in effect, I'd expect NUL, > rather than newline, to be the byte that separates separate patterns > in the pattern argument You're right, I think it's a bug that grep -zf FILE uses newline separators in FILE. It should use NUL separators. This cannot be done for NUL bytes in command-line patterns, though, since command-line arguments cannot contain NUL bytes.
bug-grep@HIDDEN:bug#32704; Package grep.
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Subject: Re: bug#32704: Can grep search for a line feed and a null character
at the same time?
To: 21naown@HIDDEN, 32704 <at> debbugs.gnu.org
References: <7c837f78-a794-94e7-0562-bc768b0213ac@HIDDEN>
From: Eric Blake <eblake@HIDDEN>
Organization: Red Hat, Inc.
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On 9/11/18 11:25 AM, 21naown@HIDDEN wrote:
> Hello,
>
>
> I found someone who asked the same question on “Stack Overflow”, still
> unanswered, but this person did not ask it on the mailing list.
>
> Here are the details of the question which are nearly similar to my case:
> https://stackoverflow.com/questions/50295772/can-grep-search-for-a-line-feed-and-a-null-character-at-the-same-time
Per 'info grep':
15. How can I match across lines?
Standard grep cannot do this, as it is fundamentally line-based.
Therefore, merely using the ‘[:space:]’ character class does not
match newlines in the way you might expect.
With the GNU ‘grep’ option ‘-z’ (‘--null-data’), each input and
output “line” is null-terminated; *note Other Options::. Thus, you
can match newlines in the input, but typically if there is a match
the entire input is output, so this usage is often combined with
output-suppressing options like ‘-q’, e.g.:
printf 'foo\nbar\n' | grep -z -q 'foo[[:space:]]\+bar'
If this does not suffice, you can transform the input before giving
it to ‘grep’, or turn to ‘awk’, ‘sed’, ‘perl’, or many other
utilities that are designed to operate across lines.
Grep does not have the ability to match hex or octal backslash
sequences, and a literal newline in the pattern is taken as a separation
of patterns. Use of [:space:] to include newline alongside other things
sort of works. But maybe we really do have a bug - when -z is in
effect, I'd expect NUL, rather than newline, to be the byte that
separates separate patterns in the pattern argument (and thus expressing
a literal newline, as in shells that understand $'\n$', to be viable for
writing a single pattern that matches exactly one newline byte at the
end of a NUL-separated record).
That said, your EASIEST approach is to use iconv to recode your file out
of UTF-16 (which is NOT conducive to multi-byte processing), into
something friendlier like UTF-8, and then use grep on the converted file.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
bug-grep@HIDDEN:bug#32704; Package grep.
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[109.12.232.152]) by smtp.googlemail.com with ESMTPSA id g2-v6sm2020061wme.20.2018.09.11.09.25.20 for <bug-grep@HIDDEN> (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 11 Sep 2018 09:25:20 -0700 (PDT) From: 21naown@HIDDEN X-Google-Original-From: 21Naown@HIDDEN To: bug-grep@HIDDEN Subject: Can grep search for a line feed and a null character at the same time? Message-ID: <7c837f78-a794-94e7-0562-bc768b0213ac@HIDDEN> Date: Tue, 11 Sep 2018 18:25:20 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-GB X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Tue, 11 Sep 2018 12:26:53 -0400 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -5.0 (-----) Hello, I found someone who asked the same question on “Stack Overflow”, still unanswered, but this person did not ask it on the mailing list. Here are the details of the question which are nearly similar to my case: https://stackoverflow.com/questions/50295772/can-grep-search-for-a-line-feed-and-a-null-character-at-the-same-time Thank you for your understanding. Best regards.
21naown@HIDDEN:bug-grep@HIDDEN.
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