Question re: null

I have written a function that will return an integer based on the length
of a given field defined as text.
It seems that if the given field has not yet been populated (ie: it is
null), my function returns nothing. I have tried expressly sending back a
value as such to no avail:

int isempty(text*)
{
return (100);
}

If the text* is null, it does not return 100 though it does seem to
process the function and does not core dump. (ie: returns blank entries
with the proper number of tuples at the end). Any ideas? Thanks again.

--
Colin Dick
On Call Internet Services
cdick(at)mail(dot)ocis(dot)net