On Fri, Jan 15, 2010 at 03:58:47PM -0500, David Korn wrote:
> > Also in t+, there are problems with discipline functions:
> >
> > $ ksh -c 'function x.get { print "Subscript: ${.sh.subscript}"; }; :
> > ${x[1]}; print Done'
> > Done
> > $ ksh -c 'typeset -A x; function x.get { print "Subscript:
> > ${.sh.subscript}"; }; : ${x[1]}; print Done'
> > Memory fault
> I ran this with the current release and did not get a core dump.
Thanks, I've built 2009-12-24 and it resolved the core dump problem. But, I
still get the earlier problem. In ksh93r, the get discipline function is
invoked for all references to values in indexed arrays:
$ ksh93r -c 'function x.get { print "Subscript: ${.sh.subscript}"; }; x[2]=; :
${x[1]} ${x[2]}'
Subscript: 1
Subscript: 2
In ksh93t+, including the beta, it is still invoked for all references to
values in associative arrays:
$ ksh93 -c 'typeset -A x; function x.get { print "Subscript: ${.sh.subscript}";
}; x[2]=; : ${x[1]} ${x[2]}'
Subscript: 1
Subscript: 2
but is invoked for references to the values of indexed arrays only if an index
has been set:
$ ksh93 -c 'function x.get { print "Subscript: ${.sh.subscript}"; }; x[2]=; :
${x[1]} ${x[2]}'
Subscript: 2
This foils an attempt to create a function that provides a value for indexes
that aren't set. In some (though not all) cases it can be worked around by
using an associative array, but it is unexpected behavior.
John
--
John DuBois [email protected] KC6QKZ/AE
I wish to God these calculations had been executed by steam. - Charles Babbage
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