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151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
/**
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* @file llist.h
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* (Doubly) Linked lists anchored at both ends
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*
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* $Id$
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*
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* (C) Copyright 2012 flemming.madsen at madsensoft.dk. Notice at end of file
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*/
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/// Struct mix-in. Use this inside your struct declaration
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#define LListField(tn) tn * _llNext; tn * _llPrev
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/// Anchor Declaration. Use like: LList(typename) varname;
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#define LList(tn) struct { tn *head; tn *tail; int numElm; }
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/// List init
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#define lListInit(a) ((a)->head = (a)->tail = NULL, (a)->numElm = 0, (a))
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/// List empty
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#define lListEmpty(a) ((a)->head == NULL)
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/// List head
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#define lListHead(a) ((a)->head)
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/// List tail
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#define lListTail(a) ((a)->tail)
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/// List length
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#define lListLength(a) ((a)->numElm)
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/// List element next
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#define lListNext(e) ((e)->_llNext)
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/// List element prev
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#define lListPrev(e) ((e)->_llPrev)
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/// Append element e to list e
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#define lListAppend(a, e) \
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{ \
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if (lListEmpty(a)) (a)->head = (e); \
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else (a)->tail->_llNext = (e); \
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(e)->_llPrev = (a)->tail; \
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(a)->tail = (e); \
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(e)->_llNext = NULL; \
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(a)->numElm++; \
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}
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/// Insert element n before element e in list a
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#define lListInsertFirst(a, n) lListInsert(a, n, (a)->head)
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/// Insert element n before element e in list a
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#define lListInsert(a, n, e) \
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{ \
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if (!(e) || (a)->head == (e)) { \
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n->_llNext = (a)->head; \
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n->_llPrev = NULL; \
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(a)->head = (n); \
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} else { \
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n->_llNext = (e); \
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n->_llPrev = (e)->_llPrev; \
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(e)->_llPrev->_llNext = n; \
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} \
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if (n->_llNext) n->_llNext->_llPrev = n; \
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(a)->numElm++; \
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}
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/// Remove element e from list a. Caller must free element.
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#define lListRemove(a, e) \
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{ \
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if ((a)->head) { \
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if ((e) == (a)->head) (a)->head = (e)->_llNext; \
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else (e)->_llPrev->_llNext = (e)->_llNext; \
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if ((e) == (a)->tail) (a)->tail = (e)->_llPrev; \
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else (e)->_llNext->_llPrev = (e)->_llPrev; \
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(a)->numElm--; \
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} \
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}
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/// Purge list a elements with free()
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#define lListPurgeT(a, T) \
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{ \
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T p1, p2; \
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for (p1 = (a)->head; p1; ) { \
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p2 = p1; p1 = p1->_llNext; free(p2); \
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} \
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lListInit(a); \
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}
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/// Remove last element from list a
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#define lListRemoveTailT(a, T) \
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{ \
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T p; \
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if ((a)->tail) { \
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p = (a)->tail; \
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(a)->tail = (a)->tail->_llPrev; \
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if ((a)->tail) (a)->tail->_llNext = NULL; \
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else (a)->head = NULL; \
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free(p); \
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(a)->numElm--; \
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} \
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}
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/// Remove first element from list a
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#define lListRemoveHeadT(a, T) \
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{ \
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T p; \
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if ((a)->head) { \
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p = (a)->head; \
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(a)->head = (a)->head->_llNext; \
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if ((a)->head) (a)->head->_llPrev = NULL; \
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else (a)->tail = NULL; \
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free(p); \
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(a)->numElm--; \
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} \
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}
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// Convenience
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// Only use if you have typeof() eg. gcc
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#define lListPurge(a) lListPurgeT(a, typeof((a)->head))
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#define lListRemoveTail(a) lListRemoveTailT(a, typeof((a)->head))
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#define lListRemoveHead(a) lListRemoveHeadT(a, typeof((a)->head))
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/// Traverse the list foreach e in a
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#define lListForeachIn(e, a) for (e = (a)->head; e; e = e->_llNext)
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/******************************************************************************
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* Copyright (C) 2012 flemming.madsen at madsensoft.dk. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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******************************************************************************/
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// vim: set sw=3 sts=3 et:
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