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4763ca1376
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@309 fefdeb5f-60dc-0310-8127-8f9354f1896f
69 lines
2.8 KiB
C
69 lines
2.8 KiB
C
#ifndef foollistfoo
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#define foollistfoo
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/* $Id$ */
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/***
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This file is part of polypaudio.
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polypaudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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polypaudio 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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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with polypaudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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/* Some macros for maintaining doubly linked lists */
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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 PA_LLIST_HEAD(t,name) 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 PA_LLIST_FIELDS(t) t *next, *prev
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/* Initialize the list's head */
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#define PA_LLIST_HEAD_INIT(t,item) do { (item) = NULL; } while(0)
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/* Initialize a list item */
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#define PA_LLIST_INIT(t,item) 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(0)
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/* Prepend an item to the list */
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#define PA_LLIST_PREPEND(t,head,item) 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 (0)
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/* Remove an item from the list */
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#define PA_LLIST_REMOVE(t,head,item) 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(0)
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#endif
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