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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
#include <tcl.h>
typedef struct _Blt_Chain *Blt_Chain;
typedef struct _Blt_ChainLink *Blt_ChainLink;
/*
* A Blt_ChainLink is the container structure for the Blt_Chain.
*/
struct _Blt_ChainLink {
Blt_ChainLink prev; /* Link to the previous link */
Blt_ChainLink next; /* Link to the next link */
ClientData clientData; /* Pointer to the data object */
};
typedef int (Blt_ChainCompareProc)(Blt_ChainLink *l1Ptr, Blt_ChainLink *l2Ptr);
/*
* A Blt_Chain is a doubly chained list structure.
*/
struct _Blt_Chain {
Blt_ChainLink head; /* Pointer to first element in chain */
Blt_ChainLink tail; /* Pointer to last element in chain */
long nLinks; /* Number of elements in chain */
};
extern void Blt_Chain_Init(Blt_Chain chain);
extern Blt_Chain Blt_Chain_Create(void);
extern void Blt_Chain_Destroy(Blt_Chain chain);
extern Blt_ChainLink Blt_Chain_NewLink(void);
extern Blt_ChainLink Blt_Chain_AllocLink(size_t size);
extern Blt_ChainLink Blt_Chain_Append(Blt_Chain chain,
ClientData clientData);
extern Blt_ChainLink Blt_Chain_Prepend(Blt_Chain chain,
ClientData clientData);
extern void Blt_Chain_Reset(Blt_Chain chain);
extern void Blt_Chain_InitLink(Blt_ChainLink link);
extern void Blt_Chain_LinkAfter(Blt_Chain chain, Blt_ChainLink link,
Blt_ChainLink after);
extern void Blt_Chain_LinkBefore(Blt_Chain chain, Blt_ChainLink link,
Blt_ChainLink before);
extern void Blt_Chain_UnlinkLink(Blt_Chain chain, Blt_ChainLink link);
extern void Blt_Chain_DeleteLink(Blt_Chain chain, Blt_ChainLink link);
extern int Blt_Chain_IsBefore(Blt_ChainLink first, Blt_ChainLink last);
#define Blt_Chain_GetLength(c) (((c) == NULL) ? 0 : (c)->nLinks)
#define Blt_Chain_FirstLink(c) (((c) == NULL) ? NULL : (c)->head)
#define Blt_Chain_LastLink(c) (((c) == NULL) ? NULL : (c)->tail)
#define Blt_Chain_PrevLink(l) ((l)->prev)
#define Blt_Chain_NextLink(l) ((l)->next)
#define Blt_Chain_GetValue(l) ((l)->clientData)
#define Blt_Chain_FirstValue(c) (((c)->head == NULL) ? NULL : (c)->head->clientData)
#define Blt_Chain_SetValue(l, value) ((l)->clientData = (ClientData)(value))
#define Blt_Chain_AppendLink(c, l) \
(Blt_Chain_LinkAfter((c), (l), (Blt_ChainLink)NULL))
#define Blt_Chain_PrependLink(c, l) \
(Blt_Chain_LinkBefore((c), (l), (Blt_ChainLink)NULL))
#endif /* _BLT_CHAIN_H */
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