usr/src/common/mdesc/mdesc_findnodeprop.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/types.h>
  30 #include <sys/param.h>
  31 #include <sys/mdesc.h>
  32 #include <sys/mdesc_impl.h>
  33
  34 mde_cookie_t
  35 md_find_node_prop(md_impl_t *mdp,
  36         mde_cookie_t node,
  37         mde_str_cookie_t prop_name,
  38         int tag_type)
  39 {
  40         md_element_t *mdep;
  41         int idx;
  42
  43         if (node == MDE_INVAL_ELEM_COOKIE ||
  44             prop_name == MDE_INVAL_STR_COOKIE) {
  45                 return (MDE_INVAL_ELEM_COOKIE);
  46         }
  47
  48         idx = (int)node;
  49         mdep = &(mdp->mdep[idx]);
  50
  51                 /* Skip over any empty elements */
  52         while (MDE_TAG(mdep) == MDET_NULL) {
  53                 idx++;
  54                 mdep++;
  55         }
  56
  57                 /* see if cookie is infact a node */
  58         if (MDE_TAG(mdep) != MDET_NODE) {
  59                 return (MDE_INVAL_ELEM_COOKIE);
  60         }
  61
  62         /*
  63          * Simply walk the elements in the node
  64          * looking for a property with a matching name.
  65          */
  66
  67         for (idx++, mdep++; MDE_TAG(mdep) != MDET_NODE_END; idx++, mdep++) {
  68                 if (MDE_TAG(mdep) == tag_type) {
  69                         if (MDE_NAME(mdep) == prop_name) {
  70                                 return ((mde_cookie_t)idx);
  71                         }
  72                 }
  73         }
  74
  75         return (MDE_INVAL_ELEM_COOKIE); /* no such property name */
  76 }