TBLT_RETC TBLT_ENTRY BltIx4EqualOrLesserKey(TBLT_KH *khPtr,
VOID *keyBufferPtr,
ULONG *recNoPtr);
khPtr I:index file control structure
keyBufferPtr IO:key to find/key found
recNoPtr IO:recNo to match (or 0)/recNo of key found
This routine finds either the exact match for the key in keyBufferPtr and
the recNo in recNoPtr (if not zero, the first key match otherwise), or the
previous, lesser key.
The previous lesser key is the key that would have preceded the exact key to find had that key been in the index file.
Return: Non-zero indicates an error, otherwise the key/recNo is returned.