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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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 2006 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>
#ifdef _KERNEL
#include <sys/systm.h>
#else
#include <string.h>
#include <strings.h>
#endif
#include <sys/mdesc.h>
#include <sys/mdesc_impl.h>
static int
mdl_scan_dag(md_impl_t *mdp,
int nodeidx,
mde_str_cookie_t node_cookie,
mde_str_cookie_t arc_cookie,
uint8_t *dseenp,
int *idxp,
mde_cookie_t *stashp,
int level);
int
md_scan_dag(md_t *ptr,
mde_cookie_t startnode,
mde_str_cookie_t node_name_cookie,
mde_str_cookie_t arc_name_cookie,
mde_cookie_t *stashp)
{
int res;
int idx;
uint8_t *seenp;
md_impl_t *mdp;
int start;
mdp = (md_impl_t *)ptr;
/*
* Possible the caller was lazy and didn't check the
* validitiy of either the node name or the arc name
* on calling ... in which case fail to find any
* nodes.
* This is distinct, from a fail (-1) since we return
* that nothing was found.
*/
if (node_name_cookie == MDE_INVAL_STR_COOKIE ||
arc_name_cookie == MDE_INVAL_STR_COOKIE) return 0;
/*
* if we want to start at the top, start at index 0
*/
start = (int)startnode;
if (start == MDE_INVAL_ELEM_COOKIE) start = 0;
/*
* Scan from the start point until the first node.
*/
while (MDE_TAG(&mdp->mdep[start]) == MDET_NULL) start++;
/*
* This was a bogus start point if no node found
*/
if (MDE_TAG(&mdp->mdep[start]) != MDET_NODE) {
return (-1); /* illegal start node specified */
}
/*
* Allocate a recursion mask on the local stack fail
* if we can't allocate the recursion detection.
*/
seenp = (uint8_t *)mdp->allocp(mdp->element_count);
if (seenp == NULL)
return (-1);
(void) memset(seenp, 0, mdp->element_count);
/*
* Now build the list of requested nodes.
*/
idx = 0;
res = mdl_scan_dag(mdp, start,
node_name_cookie, arc_name_cookie,
seenp, &idx, stashp, 0);
mdp->freep(seenp, mdp->element_count);
return (res >= 0 ? idx : res);
}
static int
mdl_scan_dag(md_impl_t *mdp,
int nodeidx,
mde_str_cookie_t node_name_cookie,
mde_str_cookie_t arc_name_cookie,
uint8_t *seenp,
int *idxp,
mde_cookie_t *stashp,
int level)
{
md_element_t *mdep;
mdep = &(mdp->mdep[nodeidx]);
/* see if cookie is infact a node */
if (MDE_TAG(mdep) != MDET_NODE)
return (-1);
/* have we been here before ? */
if (seenp[nodeidx])
return (0);
seenp[nodeidx] = 1;
/* is this node of the type we seek ? */
#ifdef DEBUG_LIBMDESC
{
int x;
for (x = 0; x < level; x++)
printf("-");
printf("%d (%s)\n", nodeidx, (char *)(mdp->datap + MDE_NAME(mdep)));
}
#endif
if (MDE_NAME(mdep) == node_name_cookie) {
/* record the node in the list and keep searching */
if (stashp != NULL) {
stashp[*idxp] = (mde_cookie_t)nodeidx;
}
(*idxp)++;
#ifdef DEBUG_LIBMDESC
printf("\t* %d\n", *idxp);
#endif
}
/*
* Simply walk the elements in the node.
* if we find a matching arc, then recursively call
* the subordinate looking for a match
*/
for (mdep++; MDE_TAG(mdep) != MDET_NODE_END; mdep++) {
if (MDE_TAG(mdep) == MDET_PROP_ARC &&
MDE_NAME(mdep) == arc_name_cookie) {
int res;
res = mdl_scan_dag(mdp,
(int)mdep->d.prop_idx,
node_name_cookie,
arc_name_cookie,
seenp, idxp, stashp, level+1);
if (res == -1)
return (res);
}
}
return (0);
}
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