common/mdesc/mdesc_findnodeprop.c

	mdesc_findnodeprop.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/mdesc.h>
#include <sys/mdesc_impl.h>

mde_cookie_t
md_find_node_prop(md_impl_t *mdp,
    mde_cookie_t node,
    mde_str_cookie_t prop_name,
    int tag_type)
{
    md_element_t *mdep;
    int idx;

    if (node == MDE_INVAL_ELEM_COOKIE ||
        prop_name == MDE_INVAL_STR_COOKIE) {
        return (MDE_INVAL_ELEM_COOKIE);
    }

    idx = (int)node;
    mdep = &(mdp->mdep[idx]);

        /* Skip over any empty elements */
    while (MDE_TAG(mdep) == MDET_NULL) {
        idx++;
        mdep++;
    }

        /* see if cookie is infact a node */
    if (MDE_TAG(mdep) != MDET_NODE) {
        return (MDE_INVAL_ELEM_COOKIE);
    }

    /*
     * Simply walk the elements in the node
     * looking for a property with a matching name.
     */

    for (idx++, mdep++; MDE_TAG(mdep) != MDET_NODE_END; idx++, mdep++) {
        if (MDE_TAG(mdep) == tag_type) {
            if (MDE_NAME(mdep) == prop_name) {
                return ((mde_cookie_t)idx);
            }
        }
    }

    return (MDE_INVAL_ELEM_COOKIE); /* no such property name */
}