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/*
* Smithsonian Astrophysical Observatory, Cambridge, MA, USA
* This code has been modified under the terms listed below and is made
* available under the same terms.
*/
/*
* Copyright 1993-2004 George A Howlett.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
* KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
* OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _BLT_CHAIN_H
#define _BLT_CHAIN_H
#define Chain_GetLength(c) (((c) == NULL) ? 0 : (c)->nLinks)
#define Chain_FirstLink(c) (((c) == NULL) ? NULL : (c)->head)
#define Chain_LastLink(c) (((c) == NULL) ? NULL : (c)->tail)
#define Chain_PrevLink(l) ((l)->prev)
#define Chain_NextLink(l) ((l)->next)
#define Chain_GetValue(l) ((l)->clientData)
#define Chain_FirstValue(c) (((c)->head == NULL) ? NULL : (c)->head->clientData)
#define Chain_SetValue(l, v) ((l)->clientData = (void*)(v))
#define Chain_AppendLink(c, l) (Chain_LinkAfter((c), (l), (ChainLink*)NULL))
#define Chain_PrependLink(c, l) (Chain_LinkBefore((c), (l), (ChainLink*)NULL))
namespace Blt {
struct ChainLink {
ChainLink* prev;
ChainLink* next;
void* clientData;
};
struct Chain {
ChainLink* head;
ChainLink* tail;
long nLinks;
};
extern Chain* Chain_Create(void);
extern ChainLink* Chain_AllocLink(size_t size);
extern void Chain_InitLink(ChainLink* link);
extern void Chain_Init(Chain* chain);
extern ChainLink* Chain_NewLink(void);
extern void Chain_Reset(Chain* chain);
extern void Chain_Destroy(Chain* chain);
extern void Chain_LinkAfter(Chain* chain, ChainLink* link, ChainLink* after);
extern void Chain_LinkBefore(Chain* chain, ChainLink* link,ChainLink* before);
extern void Chain_UnlinkLink(Chain* chain, ChainLink* link);
extern void Chain_DeleteLink(Chain* chain, ChainLink* link);
extern ChainLink* Chain_Append(Chain* chain, void* clientData);
extern ChainLink* Chain_Prepend(Chain* chain, void* clientData);
extern int Chain_IsBefore(ChainLink* first, ChainLink* last);
};
#endif
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