lib/dns/dbiterator.c

	dbiterator.c revision 9c3531d72aeaad6c5f01efe6a1c82023e1379e4d
/*
 * Copyright (C) 1999, 2000  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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM 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.
 */

/* $Id: dbiterator.c,v 1.9 2000/06/22 21:54:22 tale Exp $ */

#include <config.h>

#include <isc/util.h>

#include <dns/dbiterator.h>
#include <dns/name.h>

void
dns_dbiterator_destroy(dns_dbiterator_t **iteratorp) {
    /*
     * Destroy '*iteratorp'.
     */

    REQUIRE(iteratorp != NULL);
    REQUIRE(DNS_DBITERATOR_VALID(*iteratorp));

    (*iteratorp)->methods->destroy(iteratorp);

    ENSURE(*iteratorp == NULL);
}

isc_result_t
dns_dbiterator_first(dns_dbiterator_t *iterator) {
    /*
     * Move the node cursor to the first node in the database (if any).
     */

    REQUIRE(DNS_DBITERATOR_VALID(iterator));

    return (iterator->methods->first(iterator));
}

isc_result_t
dns_dbiterator_last(dns_dbiterator_t *iterator) {
    /*
     * Move the node cursor to the first node in the database (if any).
     */

    REQUIRE(DNS_DBITERATOR_VALID(iterator));

    return (iterator->methods->last(iterator));
}

isc_result_t
dns_dbiterator_seek(dns_dbiterator_t *iterator, dns_name_t *name) {
    /*
     * Move the node cursor to the node with name 'name'.
     */

    REQUIRE(DNS_DBITERATOR_VALID(iterator));

    return (iterator->methods->seek(iterator, name));
}

isc_result_t
dns_dbiterator_prev(dns_dbiterator_t *iterator) {
    /*
     * Move the node cursor to the previous node in the database (if any).
     */

    REQUIRE(DNS_DBITERATOR_VALID(iterator));

    return (iterator->methods->prev(iterator));
}

isc_result_t
dns_dbiterator_next(dns_dbiterator_t *iterator) {
    /*
     * Move the node cursor to the next node in the database (if any).
     */

    REQUIRE(DNS_DBITERATOR_VALID(iterator));

    return (iterator->methods->next(iterator));
}

isc_result_t
dns_dbiterator_current(dns_dbiterator_t *iterator, dns_dbnode_t **nodep,
               dns_name_t *name)
{
    /*
     * Return the current node.
     */

    REQUIRE(DNS_DBITERATOR_VALID(iterator));
    REQUIRE(nodep != NULL && *nodep == NULL);
    REQUIRE(name == NULL || dns_name_hasbuffer(name));

    return (iterator->methods->current(iterator, nodep, name));
}

isc_result_t
dns_dbiterator_pause(dns_dbiterator_t *iterator) {
    /*
     * Pause iteration.
     */

    REQUIRE(DNS_DBITERATOR_VALID(iterator));

    return (iterator->methods->pause(iterator));
}

isc_result_t
dns_dbiterator_origin(dns_dbiterator_t *iterator, dns_name_t *name) {

    /*
     * Return the origin to which returned node names are relative.
     */

    REQUIRE(DNS_DBITERATOR_VALID(iterator));
    REQUIRE(iterator->relative_names);
    REQUIRE(dns_name_hasbuffer(name));

    return (iterator->methods->origin(iterator, name));
}