117 lines
5.7 KiB
C
117 lines
5.7 KiB
C
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/*
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Copyright (c) 2007-2009, Troy D. Hanson
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef UTLIST_H
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#define UTLIST_H
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#define UTLIST_VERSION 1.7
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/* From: http://uthash.sourceforge.net/utlist.html */
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/*
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* This file contains macros to manipulate singly and doubly-linked lists.
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*
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* 1. LL_ macros: singly-linked lists.
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* 2. DL_ macros: doubly-linked lists.
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* 3. CDL_ macros: circular doubly-linked lists.
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*
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* To use singly-linked lists, your structure must have a "next" pointer.
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* To use doubly-linked lists, your structure must "prev" and "next" pointers.
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* Either way, the pointer to the head of the list must be initialized to NULL.
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*
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* ----------------.EXAMPLE -------------------------
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* struct item {
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* int id;
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* struct item *prev, *next;
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* }
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*
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* struct item *list = NULL:
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*
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* int main() {
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* struct item *item;
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* ... allocate and populate item ...
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* DL_APPEND(list, item);
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* }
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* --------------------------------------------------
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*
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* For doubly-linked lists, the append and delete macros are O(1)
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* For singly-linked lists, append and delete are O(n) but prepend is O(1)
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* The sort macro is O(n log(n)) for all types of single/double/circular lists.
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*/
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/******************************************************************************
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* doubly linked list macros (non-circular) *
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*****************************************************************************/
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#define DL_PREPEND(head,add) \
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do { \
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(add)->next = head; \
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if (head) { \
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(add)->prev = (head)->prev; \
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(head)->prev = (add); \
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} else { \
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(add)->prev = (add); \
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} \
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(head) = (add); \
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} while (0)
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#define DL_APPEND(head,add) \
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do { \
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if (head) { \
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(add)->prev = (head)->prev; \
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(head)->prev->next = (add); \
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(head)->prev = (add); \
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(add)->next = NULL; \
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} else { \
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(head)=(add); \
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(head)->prev = (head); \
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(head)->next = NULL; \
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} \
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} while (0);
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#define DL_DELETE(head,del) \
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do { \
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if ((del)->prev == (del)) { \
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(head)=NULL; \
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} else if ((del)==(head)) { \
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(del)->next->prev = (del)->prev; \
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(head) = (del)->next; \
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} else { \
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(del)->prev->next = (del)->next; \
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if ((del)->next) { \
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(del)->next->prev = (del)->prev; \
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} else { \
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(head)->prev = (del)->prev; \
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} \
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} \
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} while (0);
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#define DL_FOREACH(head,el) \
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for(el=head;el;el=el->next)
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#define DL_FOREACH_SAFE(head,el,tmp) \
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for(el=head,tmp=el->next;el;el=tmp,tmp=(el) ? (el->next) : NULL)
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#endif /* UTLIST_H */
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