Nested structures to be used in S Functions from C

Hello,

I am trying to use a structure in the following form

struct btnode {

int count ;

intvalue[MAX + 1] ;

struct btnode *child[MAX + 1] ;

} ;

in S-functions made in C. However, since these structures need to be defined as Simulink Bus objects first, I am unable to do it

Any help would be appreciated.

-Dhruv