1list(3)                   InterNetNews Documentation                   list(3)
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NAME

6       list - list routines
7

SYNOPSIS

9       #include <inn/list.h>
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11       struct node {
12           struct node *succ;
13           struct node *pred; };
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15       struct list {
16           struct node *head;
17           struct node *tail;
18           struct node *tailpred; };
19
20       void list_new(struct list *list);
21
22       struct node *list_addhead(struct list *list, struct node *node);
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24       struct node *list_addtail(struct list *list, struct node *node);
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26       struct node *list_head(struct list *list);
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28       struct node *list_tail(struct list *list);
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30       struct node *list_succ(struct node *node);
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32       struct node *list_pred(struct node *node);
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34       struct node *list_remhead(struct list *list);
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36       struct node *list_remtail(struct list *list);
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38       struct node *list_remove(struct node *node);
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40       struct node *list_insert(struct list *list, struct node *node, struct
41       node *pred);
42
43       bool list_isempty(struct list *list);
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DESCRIPTION

46       list_new initialises the list header list so as to create an empty
47       list.
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49       list_addhead adds node to the head of list, returning the node just
50       added.
51
52       list_addtail adds node to the tail of list, returning the node just
53       added.
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55       list_head returns a pointer to the the node at the head of list or NULL
56       if the list is empty.
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58       list_tail returns a pointer to the the node at the tail of list or NULL
59       if the list is empty.
60
61       list_succ returns the next (successor) node on the list after node or
62       NULL if node was the final node.
63
64       list_pred returns the previous (predecessor) node on the list before
65       node or NULL if node was the first node.
66
67       list_remhead removes the first node from list and returns it to the
68       caller. If the list is empty NULL is returned.
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70       list_remtail removes the last node from list and returns it to the
71       caller. If the list is empty NULL is returned.
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73       list_remove removes node from the list it is on and returns it to the
74       caller.
75
76       list_insert inserts node onto list after the node pred. If pred is NULL
77       then node is added to the head of list.
78

HISTORY

80       Written by Alex Kiernan <alex.kiernan@thus.net> for InterNetNews 2.4.0.
81
82       $Id: list.pod 7851 2008-05-26 19:33:08Z iulius $
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86INN 2.5.2                         2010-08-11                           list(3)