Returns the index number of the state whose name is name, or UNDEF_STATE if there isn't one (case sensitive comparison).

The result is only valid for node; another node may have a state with the same name, but a different state number.

name can be any string; it need not be a legal IDname (of course if it isn't, UNDEF_STATE will be returned).

Netica won't modify or free the passed name string.

The returned value is a 'state_bn', which is just another name for an 'int', but used to indicate that the int stands for a state index.