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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#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_ */