list.h

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/*
 * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1997-2002  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef ISC_LIST_H
#define ISC_LIST_H 1


#ifdef ISC_LIST_CHECKINIT
#define ISC_LINK_INSIST(x) ISC_INSIST(x)
#else
#define ISC_LINK_INSIST(x)
#endif

#define ISC_LIST(type) struct { type *head, *tail; }
#define ISC_LIST_INIT(list) \
    do { (list).head = NULL; (list).tail = NULL; } while (0)

#define ISC_LINK(type) struct { type *prev, *next; }
#define ISC_LINK_INIT_TYPE(elt, link, type) \
    do { \
        (elt)->link.prev = (type *)(-1); \
        (elt)->link.next = (type *)(-1); \
    } while (0)
#define ISC_LINK_INIT(elt, link) \
    ISC_LINK_INIT_TYPE(elt, link, void)
#define ISC_LINK_LINKED(elt, link) ((void *)((elt)->link.prev) != (void *)(-1))

#define ISC_LIST_HEAD(list) ((list).head)
#define ISC_LIST_TAIL(list) ((list).tail)
#define ISC_LIST_EMPTY(list) ISC_TF((list).head == NULL)

#define __ISC_LIST_PREPENDUNSAFE(list, elt, link) \
    do { \
        if ((list).head != NULL) \
            (list).head->link.prev = (elt); \
        else \
            (list).tail = (elt); \
        (elt)->link.prev = NULL; \
        (elt)->link.next = (list).head; \
        (list).head = (elt); \
    } while (0)

#define ISC_LIST_PREPEND(list, elt, link) \
    do { \
        ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
        __ISC_LIST_PREPENDUNSAFE(list, elt, link); \
    } while (0)

#define ISC_LIST_INITANDPREPEND(list, elt, link) \
        __ISC_LIST_PREPENDUNSAFE(list, elt, link)

#define __ISC_LIST_APPENDUNSAFE(list, elt, link) \
    do { \
        if ((list).tail != NULL) \
            (list).tail->link.next = (elt); \
        else \
            (list).head = (elt); \
        (elt)->link.prev = (list).tail; \
        (elt)->link.next = NULL; \
        (list).tail = (elt); \
    } while (0)

#define ISC_LIST_APPEND(list, elt, link) \
    do { \
        ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
        __ISC_LIST_APPENDUNSAFE(list, elt, link); \
    } while (0)

#define ISC_LIST_INITANDAPPEND(list, elt, link) \
        __ISC_LIST_APPENDUNSAFE(list, elt, link)

#define __ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, type) \
    do { \
        if ((elt)->link.next != NULL) \
            (elt)->link.next->link.prev = (elt)->link.prev; \
        else \
            (list).tail = (elt)->link.prev; \
        if ((elt)->link.prev != NULL) \
            (elt)->link.prev->link.next = (elt)->link.next; \
        else \
            (list).head = (elt)->link.next; \
        (elt)->link.prev = (type *)(-1); \
        (elt)->link.next = (type *)(-1); \
    } while (0)

#define __ISC_LIST_UNLINKUNSAFE(list, elt, link) \
    __ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, void)

#define ISC_LIST_UNLINK_TYPE(list, elt, link, type) \
    do { \
        ISC_LINK_INSIST(ISC_LINK_LINKED(elt, link)); \
        __ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, type); \
    } while (0)
#define ISC_LIST_UNLINK(list, elt, link) \
    ISC_LIST_UNLINK_TYPE(list, elt, link, void)

#define ISC_LIST_PREV(elt, link) ((elt)->link.prev)
#define ISC_LIST_NEXT(elt, link) ((elt)->link.next)

#define __ISC_LIST_INSERTBEFOREUNSAFE(list, before, elt, link) \
    do { \
        if ((before)->link.prev == NULL) \
            ISC_LIST_PREPEND(list, elt, link); \
        else { \
            (elt)->link.prev = (before)->link.prev; \
            (before)->link.prev = (elt); \
            (elt)->link.prev->link.next = (elt); \
            (elt)->link.next = (before); \
        } \
    } while (0)

#define ISC_LIST_INSERTBEFORE(list, before, elt, link) \
    do { \
        ISC_LINK_INSIST(ISC_LINK_LINKED(before, link)); \
        ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
        __ISC_LIST_INSERTBEFOREUNSAFE(list, before, elt, link); \
    } while (0)

#define __ISC_LIST_INSERTAFTERUNSAFE(list, after, elt, link) \
    do { \
        if ((after)->link.next == NULL) \
            ISC_LIST_APPEND(list, elt, link); \
        else { \
            (elt)->link.next = (after)->link.next; \
            (after)->link.next = (elt); \
            (elt)->link.next->link.prev = (elt); \
            (elt)->link.prev = (after); \
        } \
    } while (0)

#define ISC_LIST_INSERTAFTER(list, after, elt, link) \
    do { \
        ISC_LINK_INSIST(ISC_LINK_LINKED(after, link)); \
        ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
        __ISC_LIST_INSERTAFTERUNSAFE(list, after, elt, link); \
    } while (0)

#define ISC_LIST_APPENDLIST(list1, list2, link) \
    do { \
        if (ISC_LIST_EMPTY(list1)) \
            (list1) = (list2); \
        else if (!ISC_LIST_EMPTY(list2)) { \
            (list1).tail->link.next = (list2).head; \
            (list2).head->link.prev = (list1).tail; \
            (list1).tail = (list2).tail; \
        } \
        (list2).head = NULL; \
        (list2).tail = NULL; \
    } while (0)

#define ISC_LIST_ENQUEUE(list, elt, link) ISC_LIST_APPEND(list, elt, link)
#define __ISC_LIST_ENQUEUEUNSAFE(list, elt, link) \
    __ISC_LIST_APPENDUNSAFE(list, elt, link)
#define ISC_LIST_DEQUEUE(list, elt, link) \
     ISC_LIST_UNLINK_TYPE(list, elt, link, void)
#define ISC_LIST_DEQUEUE_TYPE(list, elt, link, type) \
     ISC_LIST_UNLINK_TYPE(list, elt, link, type)
#define __ISC_LIST_DEQUEUEUNSAFE(list, elt, link) \
    __ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, void)
#define __ISC_LIST_DEQUEUEUNSAFE_TYPE(list, elt, link, type) \
    __ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, type)

#define ISC_LIST_INITIAL_TYPE(type) { (type *)NULL, (type *)NULL }
#define ISC_LIST_INITIAL ISC_LIST_INITIAL_TYPE(void)

#define ISC_LINK_INITIAL(type) { (type *)-1, (type *)-1 }

#endif /* ISC_LIST_H */