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 FILE: pvl.h
 CREATOR: eric November, 1995

 (C) COPYRIGHT 2000, Eric Busboom <eric@softwarestudio.org>

#ifndef __PVL_H__
#define __PVL_H__

typedef struct pvl_list_t* pvl_list;
typedef struct pvl_elem_t* pvl_elem;

 * This type is private. Always use pvl_elem instead. The struct would
 * not even appear in this header except to make code in the USE_MACROS
 * blocks work

typedef struct pvl_elem_t
      int MAGIC;              /**< Magic Identifier */
      void *d;                /**< Pointer to data user is storing */
      struct pvl_elem_t *next;      /**< Next element */
      struct pvl_elem_t *prior;     /**< Prior element */
} pvl_elem_t;

 * This global is incremented for each call to pvl_new_element(); it gives each
 * list a unique identifer

extern int  pvl_elem_count;
extern int  pvl_list_count;

/* Create new lists or elements */
pvl_elem pvl_new_element(void* d, pvl_elem next,pvl_elem prior);
pvl_list pvl_newlist(void);
void pvl_free(pvl_list);

/* Add, remove, or get the head of the list */
void pvl_unshift(pvl_list l,void *d);
void* pvl_shift(pvl_list l);
pvl_elem pvl_head(pvl_list);

/* Add, remove or get the tail of the list */
void pvl_push(pvl_list l,void *d);
void* pvl_pop(pvl_list l);
pvl_elem pvl_tail(pvl_list);

/* Insert elements in random places */
typedef int (*pvl_comparef)(void* a, void* b); /* a, b are of the data type*/
void pvl_insert_ordered(pvl_list l,pvl_comparef f,void *d);
void pvl_insert_after(pvl_list l,pvl_elem e,void *d);
void pvl_insert_before(pvl_list l,pvl_elem e,void *d);

/* Remove an element, or clear the entire list */
void* pvl_remove(pvl_list,pvl_elem); /* Remove element, return data */
void pvl_clear(pvl_list); /* Remove all elements, de-allocate all data */

int pvl_count(pvl_list);

/* Navagate the list */
pvl_elem pvl_next(pvl_elem e);
pvl_elem pvl_prior(pvl_elem e);

/* get the data in the list */
void* pvl_data(pvl_elem);
#define pvl_data(x) x==0 ? 0 : ((struct pvl_elem_t *)x)->d;

/* Find an element for which a function returns true */
typedef int (*pvl_findf)(void* a, void* b); /*a is list elem, b is other data*/
pvl_elem pvl_find(pvl_list l,pvl_findf f,void* v);
pvl_elem pvl_find_next(pvl_list l,pvl_findf f,void* v);

 * Pass each element in the list to a function
 * a is list elem, b is other data
typedef void (*pvl_applyf)(void* a, void* b); 
void pvl_apply(pvl_list l,pvl_applyf f, void *v);

#endif /* __PVL_H__ */

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