Assaf Gordon <assafgordon@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Assaf Gordon <assafgordon@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.era eriksson <era@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.era eriksson <era@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at 8103) by debbugs.gnu.org; 22 Jul 2011 22:06:06 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Jul 22 18:06:06 2011 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1QkNrB-0006xv-IV for submit <at> debbugs.gnu.org; Fri, 22 Jul 2011 18:06:05 -0400 Received: from mx.meyering.net ([82.230.74.64]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <jim@HIDDEN>) id 1QkNr9-0006xQ-4N for 8103 <at> debbugs.gnu.org; Fri, 22 Jul 2011 18:06:03 -0400 Received: from rho.meyering.net (localhost.localdomain [127.0.0.1]) by rho.meyering.net (Acme Bit-Twister) with ESMTP id 663FE600AC; Sat, 23 Jul 2011 00:05:57 +0200 (CEST) From: Jim Meyering <jim@HIDDEN> To: Bjartur Thorlacius <svartman95@HIDDEN> Subject: tac RFE: accept -z, --zero-terminated option (was: bug#8103: NUL terminated lines In-Reply-To: <87fwrd3mio.fsf@HIDDEN> (Jim Meyering's message of "Thu, 24 Feb 2011 08:43:59 +0100") References: <AANLkTi=eewXu0wqMEgqVMMD3d2qj3hAB22=-10Mz7az-@mail.gmail.com> <87fwrd3mio.fsf@HIDDEN> Date: Sat, 23 Jul 2011 00:05:57 +0200 Message-ID: <87vcuu55tm.fsf_-_@HIDDEN> Lines: 26 MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -6.1 (------) X-Debbugs-Envelope-To: 8103 Cc: 8103 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://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: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: -6.1 (------) retitle 8103 tac RFE: accept -z, --zero-terminated option tags 8103 + notabug thanks Jim Meyering wrote: > Bjartur Thorlacius wrote: >>> Maybe we should modify tac to add the -z option. Would you care to >> write a patch? >> It would be redundant, as tac -s $'\0' is equivalent. > > Are you using a non-GNU version of tac? > If so, please tell us which one -- that may influence > the decision of whether to make "-s ''" work or to add -z. > > With GNU tac, that has never worked: > > $ tac -s '' > tac: separator cannot be empty > > Making -s accommodate an empty string argument is a possibility, > but that change looks like it'd be relatively disruptive. > > Unless there is already an implementation for which -s '' works, > I like the idea of adding -z. I've changed the title and marking this as "not a bug."
owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#8103; Package coreutils.
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Subject: Re: bug#8103: NUL terminated lines
References: <AANLkTi=eewXu0wqMEgqVMMD3d2qj3hAB22=-10Mz7az-@mail.gmail.com> <87fwrd3mio.fsf@HIDDEN> <AANLkTin-aDZzGrk2dnu8SFS9McbnHLLvGiujt0=XLVp5@HIDDEN> <87sjvdxn6u.fsf@HIDDEN>
<m262s8yoag.fsf@HIDDEN> <87fwrbub9u.fsf@HIDDEN>
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On 02/25/2011 01:09 PM, Jim Meyering wrote:
>> Actually the shell does. $'\0' and '' are indistinguishable once pass=
ed
>> as argument.
>=20
> I thought so, too. Then I tried this:
>=20
> $ zsh -c "printf \$'\0'|wc -c"
> 1
> $ bash -c "printf \$'\0'|wc -c"
> 0
>=20
> The former prints a NUL byte.
> The latter prints nothing.
>=20
> So it depends on your shell.
zsh does some magic to preserve NUL bytes _when passed as arguments to
shell builtins_. In this case, printf is a zsh shell builtin,
therefore, zsh's $'\0' is able to preserve the fact that you passed in a
NUL byte, then printf outputs that NUL byte again, such that wc sees it
on stdin.
But zsh is special in that regards, and it violates the upcoming POSIX
wording that will be standardized regarding $'' behavior (which means
zsh will have to add yet another shell option soon, if it hasn't
already, to choose between posix and zsh behavior regarding NUL):
http://austingroupbugs.net/view.php?id=3D249
If a \xXX or \XXX escape sequence yields a byte whose value
is 0, that byte and any following regular characters and
escape sequences up to the terminating unescaped single-quote
shall be evaluated and discarded.
Bash, on the other hand, strips NUL bytes everywhere. And zsh _can't_
preserve NUL bytes to non-builtins.
[As a side note, printf '\0' portably prints a NUL byte, but that's
because you're passing two bytes on input which get interpreted as an
escape sequence, and not passing a literal NUL byte as in zsh printf $'\0=
']
--=20
Eric Blake eblake@HIDDEN +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#8103; Package coreutils.
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From: Jim Meyering <jim@HIDDEN>
To: Andreas Schwab <schwab@HIDDEN>
Subject: Re: bug#8103: NUL terminated lines
In-Reply-To: <m262s8yoag.fsf@HIDDEN> (Andreas Schwab's message of "Fri, 25
Feb 2011 19:14:31 +0100")
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Andreas Schwab wrote:
> Jim Meyering <jim@HIDDEN> writes:
>
>> Bjartur Thorlacius wrote:
>>> On 2/24/11, Jim Meyering <jim@HIDDEN> wrote:
>>>> With GNU tac, that has never worked:
>>>>
>>>> $ tac -s ''
>>>> tac: separator cannot be empty
>>>>
>>> NUL!=the empty string.
>>
>> tac treats them the same way.
>
> Actually the shell does. $'\0' and '' are indistinguishable once passed
> as argument.
I thought so, too. Then I tried this:
$ zsh -c "printf \$'\0'|wc -c"
1
$ bash -c "printf \$'\0'|wc -c"
0
The former prints a NUL byte.
The latter prints nothing.
So it depends on your shell.
owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#8103; Package coreutils.
Full text available.Received: (at 8103) by debbugs.gnu.org; 25 Feb 2011 18:14:42 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Feb 25 13:14:41 2011 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1Pt2Bd-0008Gp-Ch for submit <at> debbugs.gnu.org; Fri, 25 Feb 2011 13:14:41 -0500 Received: from mail-out.m-online.net ([212.18.0.10]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <whitebox@HIDDEN>) id 1Pt2Bb-0008Ge-TW for 8103 <at> debbugs.gnu.org; Fri, 25 Feb 2011 13:14:40 -0500 Received: from frontend1.mail.m-online.net (frontend1.mail.intern.m-online.net [192.168.8.180]) by mail-out.m-online.net (Postfix) with ESMTP id 4A331188A171; Fri, 25 Feb 2011 19:14:33 +0100 (CET) Received: from localhost (dynscan1.mnet-online.de [192.168.8.164]) by mail.m-online.net (Postfix) with ESMTP id 706E41C000BF; Fri, 25 Feb 2011 19:14:33 +0100 (CET) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.180]) by localhost (dynscan1.mail.m-online.net [192.168.8.164]) (amavisd-new, port 10024) with ESMTP id CZ--uXX5IrDy; Fri, 25 Feb 2011 19:14:33 +0100 (CET) Received: from igel.home (ppp-93-104-157-230.dynamic.mnet-online.de [93.104.157.230]) by mail.mnet-online.de (Postfix) with ESMTP; Fri, 25 Feb 2011 19:14:32 +0100 (CET) Received: by igel.home (Postfix, from userid 501) id 3517BCA2A0; Fri, 25 Feb 2011 19:14:32 +0100 (CET) From: Andreas Schwab <schwab@HIDDEN> To: Jim Meyering <jim@HIDDEN> Subject: Re: bug#8103: NUL terminated lines References: <AANLkTi=eewXu0wqMEgqVMMD3d2qj3hAB22=-10Mz7az-@mail.gmail.com> <87fwrd3mio.fsf@HIDDEN> <AANLkTin-aDZzGrk2dnu8SFS9McbnHLLvGiujt0=XLVp5@HIDDEN> <87sjvdxn6u.fsf@HIDDEN> X-Yow: NATHAN... your PARENTS were in a CARCRASH!! They're VOIDED - They COLLAPSED They had no CHAINSAWS... They had no MONEY MACHINES... They did PILLS in SKIMPY GRASS SKIRTS... Nathan, I EMULATED them... but they were OFF-KEY... Date: Fri, 25 Feb 2011 19:14:31 +0100 In-Reply-To: <87sjvdxn6u.fsf@HIDDEN> (Jim Meyering's message of "Thu, 24 Feb 2011 20:11:21 +0100") Message-ID: <m262s8yoag.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2.94 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Spam-Score: -2.7 (--) X-Debbugs-Envelope-To: 8103 Cc: Bjartur Thorlacius <svartman95@HIDDEN>, 8103 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/pipermail/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: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: -2.7 (--) Jim Meyering <jim@HIDDEN> writes: > Bjartur Thorlacius wrote: >> On 2/24/11, Jim Meyering <jim@HIDDEN> wrote: >>> With GNU tac, that has never worked: >>> >>> $ tac -s '' >>> tac: separator cannot be empty >>> >> NUL!=the empty string. > > tac treats them the same way. Actually the shell does. $'\0' and '' are indistinguishable once passed as argument. Andreas. -- Andreas Schwab, schwab@HIDDEN GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."
owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#8103; Package coreutils.
Full text available.Received: (at 8103) by debbugs.gnu.org; 25 Feb 2011 17:35:17 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Feb 25 12:35:16 2011 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1Pt1ZT-0007Cm-Uv for submit <at> debbugs.gnu.org; Fri, 25 Feb 2011 12:35:16 -0500 Received: from mail-vx0-f172.google.com ([209.85.220.172]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <svartman95@HIDDEN>) id 1Pt1ZS-0007Cb-Fz for 8103 <at> debbugs.gnu.org; Fri, 25 Feb 2011 12:35:14 -0500 Received: by vxg33 with SMTP id 33so1388414vxg.3 for <8103 <at> debbugs.gnu.org>; Fri, 25 Feb 2011 09:35:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=a4t2ZJApKJX8vdc1GO9jPNQFKjOi3USiQDSumXBn77o=; b=IDM5Aa6wZ/1TLS/zwmFncjcb8etK1vzF27QP2viais4nO3KavdIBDxYL0an1wSgFas wI22RVmC9hwmO4XaWBhpAS+7ZfZnDkEFD5qnHruEpmR1SWOdQTRcpDV0yyxMBWda9nKE zWLgM59u6b+I+2yCNvFdTmv5nY7602wP1bvq4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=ovuZzBE70UH3QrVBVqGDantJuSYY6zNkmXa/j6CC79p/gGw7JGxqapmQPRCxbIFYER nPSZf6NTcAyIRKKksdFxSB7uBzmnSSMyU1YSxp/ExcQ9tUsUBWKs+oXGvBk/60w8+fEx s8V/4N1c5kw6POOzp1HlKMeL9OIfa2CWKiXTA= MIME-Version: 1.0 Received: by 10.52.167.234 with SMTP id zr10mr4598937vdb.92.1298655308710; Fri, 25 Feb 2011 09:35:08 -0800 (PST) Received: by 10.52.162.70 with HTTP; Fri, 25 Feb 2011 09:35:08 -0800 (PST) In-Reply-To: <87sjvdxn6u.fsf@HIDDEN> References: <AANLkTi=eewXu0wqMEgqVMMD3d2qj3hAB22=-10Mz7az-@mail.gmail.com> <87fwrd3mio.fsf@HIDDEN> <AANLkTin-aDZzGrk2dnu8SFS9McbnHLLvGiujt0=XLVp5@HIDDEN> <87sjvdxn6u.fsf@HIDDEN> Date: Fri, 25 Feb 2011 17:35:08 +0000 Message-ID: <AANLkTi=nmsc0cJxc8Eez8dGNMswkfM1UW10ZLo52P1dK@HIDDEN> Subject: Re: bug#8103: NUL terminated lines From: Bjartur Thorlacius <svartman95@HIDDEN> To: Jim Meyering <jim@HIDDEN> Content-Type: text/plain; charset=UTF-8 X-Spam-Score: -3.6 (---) X-Debbugs-Envelope-To: 8103 Cc: 8103 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/pipermail/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: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: -3.4 (---) On 2/24/11, Jim Meyering <jim@HIDDEN> wrote: > Bjartur Thorlacius wrote: >> On 2/24/11, Jim Meyering <jim@HIDDEN> wrote: >>> Bjartur Thorlacius wrote: >>>>> Maybe we should modify tac to add the -z option. Would you care to >>>> write a patch? >>>> It would be redundant, as tac -s $'\0' is equivalent. >>> >>> Are you using a non-GNU version of tac? >> I don't remember whether I was using FreeBSD or GNU tac. > > Please confirm. I may make a difference. > I was using GNU tac, but didn't actually test tac -s $'\0'. It parses it as a C string. Makes sense, once you've written it. >>> If so, please tell us which one -- that may influence >>> the decision of whether to make "-s ''" work or to add -z. >>> >>> With GNU tac, that has never worked: >>> >>> $ tac -s '' >>> tac: separator cannot be empty >>> >> NUL!=the empty string. > > tac treats them the same way. > >>> Making -s accommodate an empty string argument is a possibility, >>> but that change looks like it'd be relatively disruptive. >>> >> I don't understand what that would do. Self-delimited strings would be >> quite disruptive, indeed, but I gather that's not what you're talking >> about. > > Changing tac.c to make -s accommodate an empty string > looks like it would require changes that are too invasive. > Maybe, but there's nothing stopping us from using non-standard string functions .
owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#8103; Package coreutils.
Full text available.Received: (at 8103) by debbugs.gnu.org; 24 Feb 2011 22:13:27 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Feb 24 17:13:27 2011 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1PsjR8-00010D-Tv for submit <at> debbugs.gnu.org; Thu, 24 Feb 2011 17:13:27 -0500 Received: from c-67-162-90-113.hsd1.in.comcast.net ([67.162.90.113] helo=kosh.dhis.org) by debbugs.gnu.org with smtp (Exim 4.69) (envelope-from <pacman-cu@HIDDEN>) id 1PsjR7-000102-MT for 8103 <at> debbugs.gnu.org; Thu, 24 Feb 2011 17:13:26 -0500 Received: (qmail 26450 invoked by uid 1000); 24 Feb 2011 22:13:19 -0000 Message-ID: <20110224221319.26449.qmail@HIDDEN> From: "Alan Curry" <pacman-cu@HIDDEN> Subject: Re: bug#8103: NUL terminated lines To: svartman95@HIDDEN (Bjartur Thorlacius) Date: Thu, 24 Feb 2011 17:13:19 -0500 (GMT+5) In-Reply-To: <AANLkTin-aDZzGrk2dnu8SFS9McbnHLLvGiujt0=XLVp5@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Spam-Score: -0.6 (/) X-Debbugs-Envelope-To: 8103 Cc: 8103 <at> debbugs.gnu.org, Jim Meyering <jim@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/pipermail/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: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: -0.6 (/) Bjartur Thorlacius writes: > > On 2/24/11, Jim Meyering <jim@HIDDEN> wrote: > > Bjartur Thorlacius wrote: > >>> Maybe we should modify tac to add the -z option. Would you care to > >> write a patch? > >> It would be redundant, as tac -s $'\0' is equivalent. Note that a $'\0' argument in a shell command line is exactly equivalent to an empty string, since it must be passed from the shell to the program using execve() which takes NUL-terminated strings. There is no way to run a program with an actual NUL byte contained in one of its arguments. execve will stop copying at the NUL, and even if it didn't, the new program receives its arguments in int argc, char **argv form so how is it supposed to know that there's a NUL in there that's not a terminator? This limitation can't be avoided. It's not just a C language thing. The execve interface is based on NUL-terminated strings at the asm level too. If tac -s $'\0' did something different from tac -s '', it could only have been a shell builtin. (Assuming the shell supported the $'...' notation at all) -- Alan Curry
owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#8103; Package coreutils.
Full text available.Received: (at 8103) by debbugs.gnu.org; 24 Feb 2011 19:11:31 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Feb 24 14:11:31 2011 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1Psgb4-0005T2-68 for submit <at> debbugs.gnu.org; Thu, 24 Feb 2011 14:11:30 -0500 Received: from mx.meyering.net ([82.230.74.64]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <jim@HIDDEN>) id 1Psgb1-0005Sp-TY for 8103 <at> debbugs.gnu.org; Thu, 24 Feb 2011 14:11:28 -0500 Received: by rho.meyering.net (Acme Bit-Twister, from userid 1000) id D0C6460067; Thu, 24 Feb 2011 20:11:21 +0100 (CET) From: Jim Meyering <jim@HIDDEN> To: Bjartur Thorlacius <svartman95@HIDDEN> Subject: Re: bug#8103: NUL terminated lines In-Reply-To: <AANLkTin-aDZzGrk2dnu8SFS9McbnHLLvGiujt0=XLVp5@HIDDEN> (Bjartur Thorlacius's message of "Thu, 24 Feb 2011 14:19:40 +0000") References: <AANLkTi=eewXu0wqMEgqVMMD3d2qj3hAB22=-10Mz7az-@mail.gmail.com> <87fwrd3mio.fsf@HIDDEN> <AANLkTin-aDZzGrk2dnu8SFS9McbnHLLvGiujt0=XLVp5@HIDDEN> Date: Thu, 24 Feb 2011 20:11:21 +0100 Message-ID: <87sjvdxn6u.fsf@HIDDEN> Lines: 33 MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -5.8 (-----) X-Debbugs-Envelope-To: 8103 Cc: 8103 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/pipermail/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: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: -5.8 (-----) Bjartur Thorlacius wrote: > On 2/24/11, Jim Meyering <jim@HIDDEN> wrote: >> Bjartur Thorlacius wrote: >>>> Maybe we should modify tac to add the -z option. Would you care to >>> write a patch? >>> It would be redundant, as tac -s $'\0' is equivalent. >> >> Are you using a non-GNU version of tac? > I don't remember whether I was using FreeBSD or GNU tac. Please confirm. I may make a difference. >> If so, please tell us which one -- that may influence >> the decision of whether to make "-s ''" work or to add -z. >> >> With GNU tac, that has never worked: >> >> $ tac -s '' >> tac: separator cannot be empty >> > NUL!=the empty string. tac treats them the same way. >> Making -s accommodate an empty string argument is a possibility, >> but that change looks like it'd be relatively disruptive. >> > I don't understand what that would do. Self-delimited strings would be > quite disruptive, indeed, but I gather that's not what you're talking > about. Changing tac.c to make -s accommodate an empty string looks like it would require changes that are too invasive.
owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#8103; Package coreutils.
Full text available.Received: (at 8103) by debbugs.gnu.org; 24 Feb 2011 14:19:49 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Feb 24 09:19:49 2011 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1Psc2m-0006fk-SF for submit <at> debbugs.gnu.org; Thu, 24 Feb 2011 09:19:49 -0500 Received: from mail-iy0-f172.google.com ([209.85.210.172]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <svartman95@HIDDEN>) id 1Psc2k-0006fW-Tn for 8103 <at> debbugs.gnu.org; Thu, 24 Feb 2011 09:19:47 -0500 Received: by iyj8 with SMTP id 8so290392iyj.3 for <8103 <at> debbugs.gnu.org>; Thu, 24 Feb 2011 06:19:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=qtzopHJIyTBj1gPrMS3K05GJByB92lojhcudOLswB5s=; b=rucoDOQK+Y9Icl5P5aKxQAe6vF7v+z/n/sda6CvzdnJa/YoTUls6Hc5/qeaVPC/Bl4 /6xqZbLNN7K4nXYWEJc+zAsXln6Jc27mieNeJnmJ0KGmb3eOmkWR4xPcWZtmnj9KkL0A rl/pR8HT41vo9WzydXlMpdYedCrmN8yx3hB7Y= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=MuFxVUZHWXLxDsHAHGYcv2VvpRnacHpWk7+6F9H5mNPonRrq/CQ2JU5H29v5uFHTEf fxFQnfPjER0qGuLkk4qhUUjU1O2AAyLd9dJYwCsfXU6sOpCFCWlCB5jHIz/17Dj0ehwI SlTtbgcnV2ayLSO7JQATnFXzAGkUO+nM/56Ko= MIME-Version: 1.0 Received: by 10.231.30.71 with SMTP id t7mr1465527ibc.153.1298557181094; Thu, 24 Feb 2011 06:19:41 -0800 (PST) Received: by 10.231.192.10 with HTTP; Thu, 24 Feb 2011 06:19:40 -0800 (PST) In-Reply-To: <87fwrd3mio.fsf@HIDDEN> References: <AANLkTi=eewXu0wqMEgqVMMD3d2qj3hAB22=-10Mz7az-@mail.gmail.com> <87fwrd3mio.fsf@HIDDEN> Date: Thu, 24 Feb 2011 14:19:40 +0000 Message-ID: <AANLkTin-aDZzGrk2dnu8SFS9McbnHLLvGiujt0=XLVp5@HIDDEN> Subject: Re: bug#8103: NUL terminated lines From: Bjartur Thorlacius <svartman95@HIDDEN> To: Jim Meyering <jim@HIDDEN> Content-Type: text/plain; charset=UTF-8 X-Spam-Score: -4.8 (----) X-Debbugs-Envelope-To: 8103 Cc: 8103 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/pipermail/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: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: -4.5 (----) On 2/24/11, Jim Meyering <jim@HIDDEN> wrote: > Bjartur Thorlacius wrote: >>> Maybe we should modify tac to add the -z option. Would you care to >> write a patch? >> It would be redundant, as tac -s $'\0' is equivalent. > > Are you using a non-GNU version of tac? I don't remember whether I was using FreeBSD or GNU tac. > If so, please tell us which one -- that may influence > the decision of whether to make "-s ''" work or to add -z. > > With GNU tac, that has never worked: > > $ tac -s '' > tac: separator cannot be empty > NUL!=the empty string. > Making -s accommodate an empty string argument is a possibility, > but that change looks like it'd be relatively disruptive. > I don't understand what that would do. Self-delimited strings would be quite disruptive, indeed, but I gather that's not what you're talking about.
owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#8103; Package coreutils.
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From: Jim Meyering <jim@HIDDEN>
To: Bjartur Thorlacius <svartman95@HIDDEN>
Subject: Re: bug#8103: NUL terminated lines
In-Reply-To: <AANLkTi=eewXu0wqMEgqVMMD3d2qj3hAB22=-10Mz7az-@mail.gmail.com>
(Bjartur Thorlacius's message of "Wed, 23 Feb 2011 23:25:14 +0000")
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Bjartur Thorlacius wrote:
>> Maybe we should modify tac to add the -z option. Would you care to
> write a patch?
> It would be redundant, as tac -s $'\0' is equivalent.
Are you using a non-GNU version of tac?
If so, please tell us which one -- that may influence
the decision of whether to make "-s ''" work or to add -z.
With GNU tac, that has never worked:
$ tac -s ''
tac: separator cannot be empty
Making -s accommodate an empty string argument is a possibility,
but that change looks like it'd be relatively disruptive.
Unless there is already an implementation for which -s '' works,
I like the idea of adding -z.
owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#8103; Package coreutils.
Full text available.Received: (at submit) by debbugs.gnu.org; 23 Feb 2011 23:25:29 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Feb 23 18:25:29 2011 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1PsO5J-0005dA-CY for submit <at> debbugs.gnu.org; Wed, 23 Feb 2011 18:25:29 -0500 Received: from eggs.gnu.org ([140.186.70.92]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <svartman95@HIDDEN>) id 1PsO5I-0005d0-5g for submit <at> debbugs.gnu.org; Wed, 23 Feb 2011 18:25:28 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <svartman95@HIDDEN>) id 1PsO5C-0008Io-7o for submit <at> debbugs.gnu.org; Wed, 23 Feb 2011 18:25:23 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=BAYES_00, FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM, RCVD_IN_DNSWL_LOW, T_DKIM_INVALID, T_TO_NO_BRKTS_FREEMAIL autolearn=no version=3.3.1 Received: from lists.gnu.org ([199.232.76.165]:37945) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <svartman95@HIDDEN>) id 1PsO5C-0008Ik-4r for submit <at> debbugs.gnu.org; Wed, 23 Feb 2011 18:25:22 -0500 Received: from [140.186.70.92] (port=46935 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PsO56-0004aM-Ku for bug-coreutils@HIDDEN; Wed, 23 Feb 2011 18:25:21 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <svartman95@HIDDEN>) id 1PsO55-0008Hv-Kx for bug-coreutils@HIDDEN; Wed, 23 Feb 2011 18:25:16 -0500 Received: from mail-iy0-f169.google.com ([209.85.210.169]:59306) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <svartman95@HIDDEN>) id 1PsO55-0008Hp-HD for bug-coreutils@HIDDEN; Wed, 23 Feb 2011 18:25:15 -0500 Received: by iyf13 with SMTP id 13so5354393iyf.0 for <bug-coreutils@HIDDEN>; Wed, 23 Feb 2011 15:25:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:date:message-id:subject:from:to :content-type; bh=Vprs/Xe3tsKebaYSbrwFVCi3GCbuAwIKgFQo/JZvEMk=; b=GBt9st93ja5jAtN/U0qdWV9tVBxpY+eM8c25ju3f7s6NFqi/l6e7e3eNqrAhz4HgO8 Vv1n6QqLrb1UvMfu3HT5gthGYt4xSMTlhtiqwNjRADQJUFS4L4IM4EUNAvME32ovHWGx 0AEKi5Mvpd/2MoORuWrKy3I6WeZPEr+A/CM9Q= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=ZRDlMdiSwMwWgO4ri4dGTJ3Z5Jb0rfu+46SInKKhJXZHcgMBqei6XK3aEcVIP+SpCk 3PsaP3coM7h8N3iQZUVqhLNi2sSYgwo+wwYQ6JKugBpu2PAVHSarJZyMRM3UdS4nSaTU xuHU4qvL8ztC/FdHO+eQ+CQCpkIiwI1+Uxrqo= MIME-Version: 1.0 Received: by 10.231.10.193 with SMTP id q1mr199101ibq.53.1298503514962; Wed, 23 Feb 2011 15:25:14 -0800 (PST) Received: by 10.231.192.10 with HTTP; Wed, 23 Feb 2011 15:25:14 -0800 (PST) Date: Wed, 23 Feb 2011 23:25:14 +0000 Message-ID: <AANLkTi=eewXu0wqMEgqVMMD3d2qj3hAB22=-10Mz7az-@mail.gmail.com> Subject: NUL terminated lines From: Bjartur Thorlacius <svartman95@HIDDEN> To: bug-coreutils@HIDDEN Content-Type: text/plain; charset=UTF-8 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 199.232.76.165 X-Spam-Score: -5.9 (-----) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/pipermail/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: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: -5.9 (-----) > Maybe we should modify tac to add the -z option. Would you care to write a patch? It would be redundant, as tac -s $'\0' is equivalent. If you want to switch between newline characters dynamically (a bad idea, IMO) you could edit libc/stdio-common/getline.c to pass read in the newline character from an environment variable. More preferably, you could rewrite getline to read in self-delimeted lines.
Bjartur Thorlacius <svartman95@HIDDEN>:bug-coreutils@HIDDEN.
Full text available.owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#8103; Package coreutils.
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