passing NULL to a "char *" from tcl

Hi,

First of all, I found swig yesterday and seriously, AMAZING! Especially
that guide for truly lazy people for writing interface file. Thanks for the
tool!

I posted on the list to receive some help regarding using C functions in
tcl.
I have compiled and loaded all packages successfully.

The point where I am stuck is that my function looks like this in C:

bool abc(void *a, char *b);

Doc [1] says to pass NULL from tcl, we should pass "NULL". I need to pass
both
arguments NULL.

I do like:

abc "NULL" "NULL"

This works well for first argument. But second argument treats NULL as a
string instead. Can anyone help me with this?

[1] http://www.swig.org/Doc1.3/Tcl.html

Thanks,
MIhir

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