Re: Certain pattern causing shell to crash

[Peter Stephenson <Peter.Stephenson@csr.com>]

On Thu, 6 Jan 2011 21:38:02 +0530
Raghavendra D Prabhu <raghu.prabhu13@gmail.com> wrote:
> Sourcing following function in a clean shell (zsh -f) followed by
> which or tab completion is causing shell to segfault
> 
> =================
> view () {
>          if [[ -z $1 ]]
>          then
>                  ranger ~/Documents
>          elif [[ $1 =~ ^http:* ]]
>          then
>                  url=${1#*=} 
>                  dest="$HOME/Documents/${1##*/}" 
>                  wget -c --content-disposition -O - -q $url > $dest
>                  detach mupdf -r 143 $dest
>          else
>                  detach mupdf -r 143 "$@"
>          fi
> }
> ======================================

Yes, I can get that.  The following is about the most simple form that
still causes it to happen:

crashme() {
  if [[ $1 =~ ^http:* ]]
  then
    url=${1#*=}
  fi
}
which crashme

It appears that the code that decodes the '=~' expression (it doesn't
happen if I turn that into '=') is causing the state to go awry, so that
the code in the line after the "then" is being read wrongly.  It's got
something to do with the regular expression, too; putting that in
parentheses or otherwise quoting the "^" makes it go away, so it maybe
related to how "^" is handled in this case.  It shouldn't be too hard to
localise; it's a shame that the the wordcode is completely
impenetrable.

-- 
Peter Stephenson <pws@csr.com>            Software Engineer
Tel: +44 (0)1223 692070                   Cambridge Silicon Radio Limited
Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, UK


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