Accessing Pointers to Nodes in a Linked List

To get the pointer to the first node in a linked list, call nd_first():

NODEPTR nd_first(hdndp)

NODEPTR hdndp;        /* Pointer to header node of linked list        */

To get the pointer to the last node in a linked list, call nd_last():

NODEPTR nd_last(hdndp)

NODEPTR hdndp;        /* Pointer to header node of linked list        */

Given a pointer to a node in a linked list, you can get the pointer to the next node by calling nd_next():

NODEPTR nd_next(ndp)

NODEPTR ndp;        /* Pointer to node in linked list            */

Given a pointer to a node in a linked list, you can get the pointer to the previous node by calling nd_prev():

NODEPTR nd_prev(ndp)

NODEPTR ndp;        /* Pointer to node in linked list            */

You can find the number of the node within the linked list by calling nd_ptrnum():

`int nd_ptrnum(ndp, hdndp)`
`NODEPTR ndp;`	`/* Pointer to node in linked list`	`*/`
`NODEPTR hdndp;`	`/* Pointer to header node of linked list`	`*/`

You can convert a node number in a linked list to a pointer to that node by calling nd_numptr():

`NODEPTR nd_numptr(nd_num, hdndp)`
`int nd_num;`	`/* Number of node`	`*/`
`NODEPTR hdndp;`	`/* Pointer to header node of linked list`	`*/`