From: Bart Schaefer <schaefer@brasslantern.com>
To: Peter Stephenson <p.stephenson@samsung.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Arith parsing bug with minus after $#
Date: Sat, 6 Jun 2015 18:08:24 -0700 [thread overview]
Message-ID: <CAH+w=7az1gDsn-48M6i1cZmouEwq_7JG+oFYab64iacubOx52Q@mail.gmail.com> (raw)
In-Reply-To: <20150529160237.6f329071@pwslap01u.europe.root.pri>
On Fri, May 29, 2015 at 8:02 AM, Peter Stephenson
<p.stephenson@samsung.com> wrote:
> On Thu, 28 May 2015 21:42:41 +0200
> Martijn Dekker <martijn@inlv.org> wrote:
>> % set --
>> % echo $#
>> 0
>> % echo $(($#-1))
>> 41
>
> That's not a compatibility issue, that's just plain weird. I don't know
> the POSIX terminology.
>
> The problem is the overloading of "#" --- the test to establish what to
> do with it is trying too hard to resolve to ${#-}, which is a valid
> substitution, because it hasn't taken into account that there are no
> braces. So what you're seeing is ${#-}1.
Incidentally, here is a few-years-old austin-group thread that is related:
http://thread.gmane.org/gmane.comp.standards.posix.austin.general/3784
prev parent reply other threads:[~2015-06-07 1:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-28 19:42 Martijn Dekker
2015-05-29 15:02 ` Peter Stephenson
2015-05-29 15:43 ` Martijn Dekker
2015-05-29 18:09 ` Bart Schaefer
2015-05-29 19:33 ` Martijn Dekker
2015-05-29 20:48 ` ZyX
2015-05-29 21:24 ` Bart Schaefer
2015-05-30 19:24 ` Peter Stephenson
2015-05-30 19:40 ` Peter Stephenson
2015-05-30 22:28 ` Bart Schaefer
2015-05-30 23:30 ` Peter Stephenson
2015-06-07 1:08 ` Bart Schaefer [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAH+w=7az1gDsn-48M6i1cZmouEwq_7JG+oFYab64iacubOx52Q@mail.gmail.com' \
--to=schaefer@brasslantern.com \
--cc=p.stephenson@samsung.com \
--cc=zsh-workers@zsh.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/zsh/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).