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gh_list.h

/***************************************************************************
 * gh_list.h -- a simple doubly-linked list implementation with a very     *
 * heavy focus on efficiency.                                              *
 *                                                                         *
 ***********************IMPORTANT NSOCK LICENSE TERMS***********************
 *                                                                         *
 * The nsock parallel socket event library is (C) 1999-2008 Insecure.Com   *
 * LLC This library is free software; you may redistribute and/or          *
 * modify it under the terms of the GNU General Public License as          *
 * published by the Free Software Foundation; Version 2.  This guarantees  *
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 * conditions.  If this license is unacceptable to you, Insecure.Com LLC   *
 * may be willing to sell alternative licenses (contact                    *
 * sales@insecure.com ).                                                   *
 *                                                                         *
 * As a special exception to the GPL terms, Insecure.Com LLC grants        *
 * permission to link the code of this program with any version of the     *
 * OpenSSL library which is distributed under a license identical to that  *
 * listed in the included Copying.OpenSSL file, and distribute linked      *
 * combinations including the two. You must obey the GNU GPL in all        *
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 * this file, you may extend this exception to your version of the file,   *
 * but you are not obligated to do so.                                     *
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 * agreement takes precedence over this comment.                          *
 *                                                                         *
 * Source is provided to this software because we believe users have a     *
 * right to know exactly what a program is going to do before they run it. *
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 *                                                                         *
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 * This program is distributed in the hope that it will be useful, but     *
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       *
 * General Public License for more details (                               *
 * http://www.gnu.org/copyleft/gpl.html ).                                 *
 *                                                                         *
 ***************************************************************************/

/* $Id: gh_list.h 6635 2007-12-22 06:32:18Z fyodor $ */

#ifndef GH_LIST_H
#define GH_LIST_H

#ifdef HAVE_CONFIG_H
#include "nsock_config.h"
#include "nbase_config.h"
#endif

#ifdef WIN32
#include "nbase_winconfig.h"
#endif

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

#define GH_LIST_MAGIC 0xBADFACE

/* 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;
#endif
} 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;
#endif
} 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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