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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 the node at the head of list or NULL
       if the list is empty.

       list_tail returns a pointer to the 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.

       $Id: list.pod 7851 2008-05-26 19:33:08Z iulius $