in a lot of places now. It _returns_ if it fails to get the necessary memory,
so any function using it should be returning a dns_result_t.
chain_name moved toward start of file, for inlining by findnode.
move_chain_to_last broke out some functionality of dns_rbtnodechain_last
(which now calls it), also for the benefit of findnode.
dns_rbtnodechain_init on the chain used by addnode.
All of the new_foundname concatenation gook was removed from findnode,
which now just sets foundname by using chain_name.
The chain set up by findnode points to the predecessor when the searched
for name is not found.
nodechain_current was changed to take name, origin and node parameters while
returning a dns_result_t. This allows the chain returned by findnode to
be named.
The nodechain_{first,last,prev} use nodechain_current to set their
names and origins. nodechain_next does not need it because it will never
have to do the "set the origin to '.' and remove '.' from names in the
root level" bit. The root level will never be more than one name, and
everything in the megatree is a successor to that node, so 'next' never
reaches the root level.
I added support for the full search algorithm to the RBT database
code. The database has some special needs in searching, in particular
certain nodes need to be examined before the DOWN pointer is followed.
I solved this problem by adding a 'callback' bit to the node structure.
When findnode is called, the caller can supply a callback. Before we go
DOWN at a node, we call the callback if the callback bit is set at the
node. If the callback returns DNS_R_CONTINUE, we proceed. Otherwise, we
will stop right there and return what the caller said to return. I
added an 'empty_data_ok' flag to findnode as well, so that nodes with
empty data can be made candidates for partial match status.
I also wanted to make dns_rbtnodechain_t public, so that a chain could
be allocated on the stack by the caller. I added two routines,
dns_rbtnodechain_init() and dns_rbtnodechain_reset() to work with them.
The latter routine frees any dynamically allocated memory associated with
the chain. The chain structure now contains the memory context. I also
moved get_ancestor_mem() and put_ancestor_mem() up in the file, so that
inlining could be more effective.
In the nits department, you wrote
*node = result == DNS_R_SUCCESS ? current : NULL;
In the future, please write this instead (the patch has this change in it):
if (result == DNS_R_SUCCESS)
*node = current;
else
*node = NULL;
Michael Graff
Bob Halley