From: Eric Blake <eblake@redhat.com>
To: Mikael Magnusson <mikachu@gmail.com>
Cc: zsh-workers@zsh.org
Subject: Re: regression in ${##""}
Date: Fri, 03 Jun 2011 13:16:24 -0600 [thread overview]
Message-ID: <4DE93308.7000105@redhat.com> (raw)
In-Reply-To: <BANLkTinWR8LuiQiHoVNABB2uuMt_U4d3TQ@mail.gmail.com>
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On 06/03/2011 12:55 PM, Mikael Magnusson wrote:
> On 3 June 2011 20:00, Eric Blake <eblake@redhat.com> wrote:
>> POSIX requires ${##""} to be parsed as ${parameter#word} with parameter
>> of # and word of "", which results in the output of $# with the shortest
>> prefix of the empty string removed (aka ${#}). But current zsh.git
>> rejects this:
>>
>> $ ./Src/zsh -c 'set a b; echo ${##""}'
>> zsh:1: bad substitution
>>
>> Worse, this is a regression:
>>
>> $ zsh -c 'set a b; echo ${##""}'
>> 2
>> $ rpm -q zsh
>> zsh-4.3.10-5.fc14.x86_64
>
> Not a surprise, this is due to
>
> 28889: ${##} should return the length of $#
Before you go changing anything, though, I just filed a bug against POSIX:
http://austingroupbugs.net/view.php?id=457
which recommends that ${parameter#word} and ${parameter##word} be
changed to be unspecified if parameter is #; this relaxation in the
standard would permit current zsh behavior.
--
Eric Blake eblake@redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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next prev parent reply other threads:[~2011-06-03 19:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-03 18:00 Eric Blake
2011-06-03 18:55 ` Mikael Magnusson
2011-06-03 19:16 ` Eric Blake [this message]
2011-06-03 20:16 ` Peter Stephenson
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