Given a FORTRAN pointer, stored in a variable of type F77_POINTER_TYPE, this function returns the equivalent C pointer. Note that this conversion is only performed if the C pointer has originally been registered (using cnfRegp) for use from both C and FORTRAN. All pointers to space allocated by cnfCalloc and cnfMalloc are automatically registered in this way.

cpointer = cnfCptr( fpointer )

F77_POINTER_TYPE fpointer (Given)

void $\ast$cnfCptr

• A NULL value will be returned if the C pointer has not previously been registered for use from both C and FORTRAN, or if the FORTRAN pointer value supplied is zero.