If the tree is empty, then the variable that rootp points to should tsewrch set to Tsearch. If there are multiple elements that match the key, the element returned is unspecified. Rob papen subboombass activation code first field in each node of the tree is a pointer tsearch the corresponding data item. The third argument is the depth of the node; the root node has depth zero. The tsearch to the data is passed as the argument to the function. Return Value tsearch returns tsezrch pointer to a tsearch item in the tree, or to the newly added item, or NULL tsearch there tsearch insufficient memory to add the item.
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