74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/* vi: set sw=4 ts=4: */
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#if !defined(_BLKID_LIST_H) && !defined(LIST_HEAD)
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#define BLKID_LIST_H 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Simple doubly linked list implementation.
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*
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* Some of the internal functions ("__xxx") are useful when
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* manipulating whole lists rather than single entries, as
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* sometimes we already know the next/prev entries and we can
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* generate better code by using them directly rather than
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* using the generic single-entry routines.
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*/
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struct list_head {
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struct list_head *next, *prev;
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};
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#define LIST_HEAD_INIT(name) { &(name), &(name) }
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#define LIST_HEAD(name) \
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struct list_head name = LIST_HEAD_INIT(name)
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#define INIT_LIST_HEAD(ptr) do { \
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(ptr)->next = (ptr); (ptr)->prev = (ptr); \
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} while (0)
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void __list_add(struct list_head * add, struct list_head * prev, struct list_head * next);
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void list_add(struct list_head *add, struct list_head *head);
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void list_add_tail(struct list_head *add, struct list_head *head);
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void __list_del(struct list_head * prev, struct list_head * next);
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void list_del(struct list_head *entry);
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void list_del_init(struct list_head *entry);
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int list_empty(struct list_head *head);
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void list_splice(struct list_head *list, struct list_head *head);
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/**
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* list_entry - get the struct for this entry
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* @ptr: the &struct list_head pointer.
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* @type: the type of the struct this is embedded in.
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* @member: the name of the list_struct within the struct.
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*/
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#define list_entry(ptr, type, member) \
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((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
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/**
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* list_for_each - iterate over elements in a list
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* @pos: the &struct list_head to use as a loop counter.
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* @head: the head for your list.
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*/
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#define list_for_each(pos, head) \
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for (pos = (head)->next; pos != (head); pos = pos->next)
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/**
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* list_for_each_safe - iterate over elements in a list, but don't dereference
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* pos after the body is done (in case it is freed)
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* @pos: the &struct list_head to use as a loop counter.
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* @pnext: the &struct list_head to use as a pointer to the next item.
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* @head: the head for your list (not included in iteration).
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*/
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#define list_for_each_safe(pos, pnext, head) \
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for (pos = (head)->next, pnext = pos->next; pos != (head); \
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pos = pnext, pnext = pos->next)
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#ifdef __cplusplus
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}
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#endif
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#endif
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