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/*
* Copyright (c) 1999 The University of Utah and the Flux Group.
* All rights reserved.
*
* Contributed by the Computer Security Research division,
* INFOSEC Research and Technology Office, NSA.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/* FLASK */
#include "avtab.h"
#define AVTAB_HASH(keyp) \
((keyp->target_type + (keyp->source_type << 4) + \
(keyp->target_class << 8)) % AVTAB_SIZE)
#define AVTAB_EQ(key,keyp) \
((key.source_type == keyp->source_type) && \
(key.target_class == keyp->target_class) && \
(key.target_type == keyp->target_type))
int
avtab_insert(avtab_t * h, avtab_key_t * key, avtab_datum_t * datum)
{
int hvalue;
avtab_ptr_t cur, newnode;
if (!h)
return -ENOMEM;
hvalue = AVTAB_HASH(key);
cur = h->htable[hvalue];
while (cur != NULL && !AVTAB_EQ(cur->key, key))
cur = cur->next;
if (cur != NULL)
return -EEXIST;
newnode = (avtab_ptr_t) malloc(sizeof(struct avtab_node_t));
if (newnode == NULL)
return -ENOMEM;
newnode->key = *key;
newnode->datum = *datum;
newnode->next = h->htable[hvalue];
h->htable[hvalue] = newnode;
h->nel++;
return 0;
}
avtab_datum_t *
avtab_search(avtab_t * h, avtab_key_t * key)
{
int hvalue;
avtab_ptr_t cur;
if (!h)
return NULL;
hvalue = AVTAB_HASH(key);
cur = h->htable[hvalue];
while (cur != NULL && !AVTAB_EQ(cur->key, key))
cur = cur->next;
if (cur == NULL)
return NULL;
return &cur->datum;
}
void
avtab_destroy(avtab_t * h)
{
int i;
avtab_ptr_t cur, temp;
if (!h)
return;
for (i = 0; i < AVTAB_SIZE; i++) {
cur = h->htable[i];
while (cur != NULL) {
temp = cur;
cur = cur->next;
free(temp);
}
}
}
int
avtab_map(avtab_t * h,
int (*apply) (avtab_key_t * k,
avtab_datum_t * d,
void *args),
void *args)
{
int i, ret;
avtab_ptr_t cur;
if (!h)
return 0;
for (i = 0; i < AVTAB_SIZE; i++) {
cur = h->htable[i];
while (cur != NULL) {
ret = apply(&cur->key, &cur->datum, args);
if (ret)
return ret;
cur = cur->next;
}
}
return 0;
}
int
avtab_init(avtab_t * h)
{
int i;
for (i = 0; i < AVTAB_SIZE; i++)
h->htable[i] = (avtab_ptr_t) NULL;
h->nel = 0;
h->ncons = 0;
return 0;
}
void
avtab_hash_eval(avtab_t * h, char *progname, char *table)
{
int i, chain_len, slots_used, max_chain_len;
avtab_ptr_t cur;
slots_used = 0;
max_chain_len = 0;
for (i = 0; i < AVTAB_SIZE; i++) {
cur = h->htable[i];
if (cur) {
slots_used++;
chain_len = 0;
while (cur) {
chain_len++;
cur = cur->next;
}
if (chain_len > max_chain_len)
max_chain_len = chain_len;
}
}
printf("%s: %s: %d nodes and %d slots used, longest chain length %d\n",
progname, table, h->nel, slots_used, max_chain_len);
}
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