dll.h

/*Header file for Doubly Linked List*/

typedef struct dll_node_{

    void *data;
    struct dll_node_ *left;
    struct dll_node_ *right;
} dll_node_t;

typedef struct dll_{
    dll_node_t *head;
} dll_t;


/* Public Function declaration to create and return
 * a new empty doubly linked list*/
dll_t *
get_new_dll();

/*Public Function declaration to add a new application
 * data to DLL*/
/* return 0 on success, -1 on failure*/
int
add_data_to_dll (dll_t *dll, void *app_data);