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/*
* Date last modified: Jan 2001
* Modifications by Dan Libby (dan@libby.com), including:
* - various fixes, null checks, etc
* - addition of Q_Iter funcs, macros
*/
/*
* File : q.h
*
* Peter Yard 02 Jan 1993.
*
* Disclaimer: This code is released to the public domain.
*/
#ifndef Q__H
#define Q__H
#ifndef False_
#define False_ 0
#endif
#ifndef True_
#define True_ 1
#endif
typedef struct nodeptr datanode;
typedef struct nodeptr {
void *data ;
datanode *prev, *next ;
} node ;
/* For external use with Q_Iter* funcs */
typedef struct nodeptr* q_iter;
typedef struct {
node *head, *tail, *cursor;
int size, sorted, item_deleted;
} queue;
typedef struct {
void *dataptr;
node *loc ;
} index_elt ;
int Q_Init(queue *q);
void Q_Destroy(queue *q);
int Q_IsEmpty(queue *q);
int Q_Size(queue *q);
int Q_AtHead(queue *q);
int Q_AtTail(queue *q);
int Q_PushHead(queue *q, void *d);
int Q_PushTail(queue *q, void *d);
void *Q_Head(queue *q);
void *Q_Tail(queue *q);
void *Q_PopHead(queue *q);
void *Q_PopTail(queue *q);
void *Q_Next(queue *q);
void *Q_Previous(queue *q);
void *Q_DelCur(queue *q);
void *Q_Get(queue *q);
int Q_Put(queue *q, void *data);
int Q_Sort(queue *q, int (*Comp)(const void *, const void *));
int Q_Find(queue *q, void *data,
int (*Comp)(const void *, const void *));
void *Q_Seek(queue *q, void *data,
int (*Comp)(const void *, const void *));
int Q_Insert(queue *q, void *data,
int (*Comp)(const void *, const void *));
/* read only funcs for iterating through queue. above funcs modify queue */
q_iter Q_Iter_Head(queue *q);
q_iter Q_Iter_Tail(queue *q);
q_iter Q_Iter_Next(q_iter qi);
q_iter Q_Iter_Prev(q_iter qi);
void* Q_Iter_Get(q_iter qi);
int Q_Iter_Put(q_iter qi, void* data); /* not read only! here for completeness. */
void* Q_Iter_Del(queue *q, q_iter iter); /* not read only! here for completeness. */
/* Fast (macro'd) versions of above */
#define Q_Iter_Head_F(q) (q ? (q_iter)((queue*)q)->head : NULL)
#define Q_Iter_Tail_F(q) (q ? (q_iter)((queue*)q)->tail : NULL)
#define Q_Iter_Next_F(qi) (qi ? (q_iter)((node*)qi)->next : NULL)
#define Q_Iter_Prev_F(qi) (qi ? (q_iter)((node*)qi)->prev : NULL)
#define Q_Iter_Get_F(qi) (qi ? ((node*)qi)->data : NULL)
#endif /* Q__H */