NAME¶

list - list routines

SYNOPSIS¶

    #include <inn/list.h>
    struct node {
        struct node *succ;
        struct node *pred;
    };
    struct list {
        struct node *head;
        struct node *tail;
        struct node *tailpred;
    };
    void list_new(struct list *list);
    struct node *list_addhead(struct list *list, struct node *node);
    struct node *list_addtail(struct list *list, struct node *node);
    struct node *list_head(struct list *list);
    struct node *list_tail(struct list *list);
    struct node *list_succ(struct node *node);
    struct node *list_pred(struct node *node);
    struct node *list_remhead(struct list *list);
    struct node *list_remtail(struct list *list);
    struct node *list_remove(struct node *node);
    struct node *list_insert(struct list *list, struct node *node,
                             struct node *pred);
    bool list_isempty(struct list *list);

DESCRIPTION¶

list_new initialises the list header list so as to create an empty list.

list_addhead adds node to the head of list, returning the node just added.

list_addtail adds node to the tail of list, returning the node just added.

list_head returns a pointer to the node at the head of list or NULL if the list is empty.

list_tail returns a pointer to the node at the tail of list or NULL if the list is empty.

list_succ returns the next (successor) node on the list after node or NULL if node was the final node.

list_pred returns the previous (predecessor) node on the list before node or NULL if node was the first node.

list_remhead removes the first node from list and returns it to the caller. If the list is empty NULL is returned.

list_remtail removes the last node from list and returns it to the caller. If the list is empty NULL is returned.

list_remove removes node from the list it is on and returns it to the caller.

list_insert inserts node onto list after the node pred. If pred is NULL then node is added to the head of list.

HISTORY¶

Written by Alex Kiernan <alex.kiernan@thus.net> for InterNetNews 2.4.0.