/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape security libraries.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1994-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

#ifndef __JAR_DS_h_
#define __JAR_DS_h_

/* Typedefs */
typedef struct ZZLinkStr ZZLink;
typedef struct ZZListStr ZZList;

/*
** Circular linked list. Each link contains a pointer to the object that
** is actually in the list.
*/ 
struct ZZLinkStr 
{
    ZZLink *next;
    ZZLink *prev;
    JAR_Item *thing;
};

struct ZZListStr 
{
    ZZLink link;
};

#define ZZ_InitList(lst)	     \
{				     \
    (lst)->link.next = &(lst)->link; \
    (lst)->link.prev = &(lst)->link; \
    (lst)->link.thing = 0;	     \
}

#define ZZ_ListEmpty(lst) \
    ((lst)->link.next == &(lst)->link)

#define ZZ_ListHead(lst) \
    ((lst)->link.next)

#define ZZ_ListTail(lst) \
    ((lst)->link.prev)

#define ZZ_ListIterDone(lst,lnk) \
    ((lnk) == &(lst)->link)

#define ZZ_AppendLink(lst,lnk)	    \
{				    \
    (lnk)->next = &(lst)->link;	    \
    (lnk)->prev = (lst)->link.prev; \
    (lst)->link.prev->next = (lnk); \
    (lst)->link.prev = (lnk);	    \
}

#define ZZ_InsertLink(lst,lnk)	    \
{				    \
    (lnk)->next = (lst)->link.next; \
    (lnk)->prev = &(lst)->link;	    \
    (lst)->link.next->prev = (lnk); \
    (lst)->link.next = (lnk);	    \
}

#define ZZ_RemoveLink(lnk)	     \
{				     \
    (lnk)->next->prev = (lnk)->prev; \
    (lnk)->prev->next = (lnk)->next; \
    (lnk)->next = 0;		     \
    (lnk)->prev = 0;		     \
}

extern ZZLink *ZZ_NewLink (JAR_Item *thing);
extern void ZZ_DestroyLink (ZZLink *link);
extern ZZList *ZZ_NewList (void);
extern void ZZ_DestroyList (ZZList *list);


#endif /* __JAR_DS_h_ */