[sr-dev] appending a new branch in route block

[Juha Heinanen]

> i want to do that inside next_gw()/next_contacts() functions, not in the
> script.  could it be somehow possible to check from the branch structure
> (dset.h/c) if request-uri is still unused?  would
> get_branch_iterator(void) and next_branch() or get_branch() work
> although they seem to be very heavy means.

looking at print_dset() implementation, it checks existence of
request-uri branch by testing

	if (msg->new_uri.s) {

based on that, would this algorithm be correct:

IF transaction does not exist OR
     (transaction exists AND msg->new_uri.s != null)
THEN
    next_gw() sets request uri
ELSE
    next_gw() appends branch
FI

-- juha