0c69794138
These lines are generally out-of-date, incomplete and unnecessary. With SPDX and git repository much more accurate and fine grained information about licensing and authorship is available, hence let's drop the per-file copyright notice. Of course, removing copyright lines of others is problematic, hence this commit only removes my own lines and leaves all others untouched. It might be nicer if sooner or later those could go away too, making git the only and accurate source of authorship information.
170 lines
9.8 KiB
C
170 lines
9.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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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(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(name,item) \
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do { \
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typeof(*(item)) *_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(name,head,item) \
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do { \
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typeof(*(head)) **_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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/* Append an item to the list */
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#define LIST_APPEND(name,head,item) \
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do { \
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typeof(*(head)) *_tail; \
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LIST_FIND_TAIL(name,head,_tail); \
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LIST_INSERT_AFTER(name,head,_tail,item); \
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} while (false)
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/* Remove an item from the list */
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#define LIST_REMOVE(name,head,item) \
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do { \
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typeof(*(head)) **_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(name,item,head) \
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do { \
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typeof(*(item)) *_item = (item); \
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if (!_item) \
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(head) = NULL; \
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else { \
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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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} \
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} while (false)
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/* Find the tail of the list */
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#define LIST_FIND_TAIL(name,item,tail) \
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do { \
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typeof(*(item)) *_item = (item); \
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if (!_item) \
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(tail) = NULL; \
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else { \
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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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} \
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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(name,head,a,b) \
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do { \
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typeof(*(head)) **_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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/* Insert an item before another one (a = where, b = what) */
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#define LIST_INSERT_BEFORE(name,head,a,b) \
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do { \
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typeof(*(head)) **_head = &(head), *_a = (a), *_b = (b); \
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assert(_b); \
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if (!_a) { \
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if (!*_head) { \
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_b->name##_next = NULL; \
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_b->name##_prev = NULL; \
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*_head = _b; \
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} else { \
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typeof(*(head)) *_tail = (head); \
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while (_tail->name##_next) \
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_tail = _tail->name##_next; \
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_b->name##_next = NULL; \
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_b->name##_prev = _tail; \
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_tail->name##_next = _b; \
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} \
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} else { \
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if ((_b->name##_prev = _a->name##_prev)) \
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_b->name##_prev->name##_next = _b; \
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else \
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*_head = _b; \
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_b->name##_next = _a; \
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_a->name##_prev = _b; \
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} \
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} while (false)
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#define LIST_JUST_US(name,item) \
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(!(item)->name##_prev && !(item)->name##_next) \
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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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#define LIST_FOREACH_BEFORE(name,i,p) \
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for ((i) = (p)->name##_prev; (i); (i) = (i)->name##_prev)
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#define LIST_FOREACH_AFTER(name,i,p) \
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for ((i) = (p)->name##_next; (i); (i) = (i)->name##_next)
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/* Iterate through all the members of the list p is included in, but skip over p */
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#define LIST_FOREACH_OTHERS(name,i,p) \
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for (({ \
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(i) = (p); \
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while ((i) && (i)->name##_prev) \
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(i) = (i)->name##_prev; \
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if ((i) == (p)) \
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(i) = (p)->name##_next; \
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}); \
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(i); \
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(i) = (i)->name##_next == (p) ? (p)->name##_next : (i)->name##_next)
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/* Loop starting from p->next until p->prev.
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p can be adjusted meanwhile. */
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#define LIST_LOOP_BUT_ONE(name,i,head,p) \
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for ((i) = (p)->name##_next ? (p)->name##_next : (head); \
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(i) != (p); \
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(i) = (i)->name##_next ? (i)->name##_next : (head))
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#define LIST_IS_EMPTY(head) \
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(!(head))
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