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91 lines
4.7 KiB
C
91 lines
4.7 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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#ifndef foolisthfoo
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#define foolisthfoo
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/* The head of the linked list. Use this in the structure that shall
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* contain the head of the linked list */
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#define LIST_HEAD(t,name) \
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t *name
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/* The pointers in the linked list's items. Use this in the item structure */
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#define LIST_FIELDS(t) \
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t *next, *prev
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/* Initialize the list's head */
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#define LIST_HEAD_INIT(t,item) \
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do { \
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(item) = (t*) NULL; } \
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while(false)
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/* Initialize a list item */
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#define LIST_INIT(t,item) \
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do { \
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t *_item = (item); \
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assert(_item); \
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_item->prev = _item->next = NULL; \
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} while(false)
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/* Prepend an item to the list */
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#define LIST_PREPEND(t,head,item) \
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do { \
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t **_head = &(head), *_item = (item); \
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assert(_item); \
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if ((_item->next = *_head)) \
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_item->next->prev = _item; \
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_item->prev = NULL; \
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*_head = _item; \
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} while(false)
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/* Remove an item from the list */
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#define LIST_REMOVE(t,head,item) \
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do { \
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t **_head = &(head), *_item = (item); \
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assert(_item); \
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if (_item->next) \
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_item->next->prev = _item->prev; \
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if (_item->prev) \
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_item->prev->next = _item->next; \
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else { \
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assert(*_head == _item); \
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*_head = _item->next; \
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} \
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_item->next = _item->prev = NULL; \
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} while(false)
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/* Find the head of the list */
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#define LIST_FIND_HEAD(t,item,head) \
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do { \
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t **_head = (head), *_item = (item); \
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*_head = _item; \
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assert(_head); \
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while ((*_head)->prev) \
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*_head = (*_head)->prev; \
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} while (false)
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/* Insert an item after another one (a = where, b = what) */
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#define LIST_INSERT_AFTER(t,head,a,b) \
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do { \
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t **_head = &(head), *_a = (a), *_b = (b); \
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assert(_b); \
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if (!_a) { \
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if ((_b->next = *_head)) \
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_b->next->prev = _b; \
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_b->prev = NULL; \
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*_head = _b; \
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} else { \
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if ((_b->next = _a->next)) \
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_b->next->prev = _b; \
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_b->prev = _a; \
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_a->next = _b; \
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} \
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} while(false)
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#define LIST_FOREACH(i,head) \
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for (i = (head); i; i = i->next)
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#define LIST_FOREACH_SAFE(i,n,head) \
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for (i = (head); i && ((n = i->next), 1); i = n)
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#endif
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