5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
129 lines
6.5 KiB
C
129 lines
6.5 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#ifndef foolisthfoo
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#define foolisthfoo
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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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_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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#endif
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