Initialising the B Tree library
#include "btree.h"
int btinit(void);
The btinit function initialises the B
Tree library. It must be invoked before any other B Tree
routine. Failure to do so will result in strange
errors.
Calling btinit more than once in the
execution lifetime of the B Tree library will cause it to
return an error (QINERR). btinit also checks that the block
size of the B Tree library is a power of two. An error return
will result for non-conformant block sizes. Successful
initialisation is indicated by a return value of zero.