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Re: Arith parsing bug with minus after $#

X-seq: zsh-workers 35327
From: Martijn Dekker <martijn@xxxxxxxx>
To: zsh-workers@xxxxxxx
Subject: Re: Arith parsing bug with minus after $#
Date: Fri, 29 May 2015 17:43:54 +0200
In-reply-to: <20150529160237.6f329071@pwslap01u.europe.root.pri>
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Peter Stephenson schreef op 29-05-15 om 17:02:
> On Thu, 28 May 2015 21:42:41 +0200
> Martijn Dekker <martijn@xxxxxxxx> 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.

Ah, yes... ${#-} is the length in characters of $-, the shell options
that are set. Before 'emulate sh', the length of $- is 8, and after,
it's 4. That explains the results I got.

The fix is working; thanks yet again.

- M.

References:
- Arith parsing bug with minus after $#
  - From: Martijn Dekker
- Re: Arith parsing bug with minus after $#
  - From: Peter Stephenson

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