kfn -- Table number to be interrogated
tableng returns the length of the specified table. This will be a power of two number in most circumstances. It will not show whether a table has a guardpoint or not. It seems this information is not available in the table's data structure. If the specified table is not found, then 0 will be returned.
Likely to be useful for setting up code for table manipulation operations, such as tablemix and tablecopy.