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 * gh_list.h -- a simple doubly-linked list implementation with a very     *
 * heavy focus on efficiency.                                              *
 *                                                                         *
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 *                                                                         *

/* $Id: gh_list.h 7327 2008-05-05 04:10:20Z fyodor $ */

#ifndef GH_LIST_H
#define GH_LIST_H

#include "nsock_config.h"
#include "nbase_config.h"

#ifdef WIN32
#include "nbase_winconfig.h"

#include "error.h"
#include "nsock_utils.h"
#include <assert.h>


/* Take a LIST ELEMENT (not just the data) and return the next one */
#define GH_LIST_ELEM_NEXT(x)  ((x)->next)
/* Same as above but return the previous element */
#define GH_LIST_ELEM_PREV(x)  ((x)->prev)
/* Take a LIST (not a list element) and return the first element */
#define GH_LIST_FIRST_ELEM(x) ((x)->first)
/* Same as above but return the last element */
#define GH_LIST_LAST_ELEM(x)  ((x)->last)
/* Obtain the actual data stored in an element */
#define GH_LIST_ELEM_DATA(x)  ((x)->data)
/* Obtain the number of elements in a list */
#define GH_LIST_COUNT(x)      ((x)->count)

typedef struct gh_list_elem {
  void *data;
  struct gh_list_elem *next;
  struct gh_list_elem *prev; 
  int allocated; /* nonzero if this element was the first (or only) in a group
                that was allocated.  This means we can safely free() it as
                long as we are OK with freeing others that were freed 
                with it ... */
#ifndef NDEBUG
  unsigned long magic;
} gh_list_elem;

typedef struct gh_list {
  int count; /* Number of elements in the list */  
  struct gh_list_elem *first;
  struct gh_list_elem *last;
  struct gh_list_elem *free; /* Instead of free()ing elements when something is                         removed from the list, we stick them here 
                                 for the next insert. */
  int last_alloc; /* The number of list elements in the most recent malloc */
#ifndef NDEBUG
  unsigned long magic;
} gh_list;

int gh_list_init(gh_list *newlist);
gh_list_elem *gh_list_append(gh_list *list, void *data);
gh_list_elem *gh_list_prepend(gh_list *list, void *data);
void *gh_list_pop(gh_list *list);
int gh_list_remove(gh_list *list, void *data);
int gh_list_free(gh_list *list);
int gh_list_remove_elem(gh_list *list, gh_list_elem *elem);

#endif /* GH_LIST_H */

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