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101 lines
5.4 KiB
C
101 lines
5.4 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,name) \
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t *name##_next, *name##_prev
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/* Initialize the list's head */
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#define LIST_HEAD_INIT(t,head) \
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do { \
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(head) = NULL; } \
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while(false)
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/* Initialize a list item */
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#define LIST_INIT(t,name,item) \
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do { \
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t *_item = (item); \
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assert(_item); \
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_item->name##_prev = _item->name##_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,name,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->name##_next = *_head)) \
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_item->name##_next->name##_prev = _item; \
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_item->name##_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,name,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->name##_next) \
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_item->name##_next->name##_prev = _item->name##_prev; \
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if (_item->name##_prev) \
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_item->name##_prev->name##_next = _item->name##_next; \
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else { \
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assert(*_head == _item); \
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*_head = _item->name##_next; \
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} \
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_item->name##_next = _item->name##_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,name,item,head) \
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do { \
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t *_item = (item); \
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assert(_item); \
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while ((_item->name##_prev) \
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_item = _item->name##_prev; \
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(head) = _item; \
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} while (false)
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/* Find the head of the list */
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#define LIST_FIND_TAIL(t,name,item,tail) \
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do { \
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t *_item = (item); \
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assert(_item); \
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while (_item->name##_next) \
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_item = _item->name##_next; \
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(tail) = _item; \
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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,name,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->name##_next = *_head)) \
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_b->name##_next->name##_prev = _b; \
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_b->name##_prev = NULL; \
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*_head = _b; \
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} else { \
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if ((_b->name##_next = _a->name##_next)) \
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_b->name##_next->name##_prev = _b; \
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_b->name##_prev = _a; \
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_a->name##_next = _b; \
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} \
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} while(false)
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#define LIST_FOREACH(name,i,head) \
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for ((i) = (head); (i); (i) = (i)->name##_next)
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#define LIST_FOREACH_SAFE(name,i,n,head) \
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for ((i) = (head); (i) && (((n) = (i)->name##_next), 1); (i) = (n))
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#endif
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