wordexp() implementation without fork()

Hi

Having a single process wordexp() implementation has been on the RTEMS
POSIX wishlist for a while. I haven't been able to find one. The POSIX
method description
seems to hint that this implementation strategy is possible and the Linux
man page
uses the phrase "shell-like expansion".

Does anyone know of an implementation that doesn't use fork()? Or an
implementation
strategy based around some open source wildcard evaluation?

Or is this a POSIX method that is just unimplementable without multiple
processes?

Thanks.

--joel