fminject/common/inj_hash.c

	inj_hash.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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <string.h>
#include <sys/types.h>

#include <inj.h>
#include <inj_err.h>

#define INJ_HASHSZ  211

struct inj_var {
    struct inj_var *v_next;
    uintmax_t v_uvalue;
    void *v_key;
};

void
inj_hash_create(inj_hash_t *h, ulong_t (*hfn)(void *),
    int (*cfn)(void *, void *))
{
    h->h_hash = inj_zalloc(sizeof (inj_var_t *) * INJ_HASHSZ);
    h->h_hashsz = INJ_HASHSZ;
    h->h_nelems = 0;

    h->h_hashfn = hfn;
    h->h_cmpfn = cfn;
}

static inj_var_t *
inj_var_alloc(void *key, uintmax_t value, inj_var_t *next)
{
    inj_var_t *v = inj_alloc(sizeof (inj_var_t));

    v->v_next = next;
    v->v_key = key;
    v->v_uvalue = value;

    return (v);
}

static void
inj_var_free(inj_var_t *v, void (*freefn)(inj_var_t *, void *), void *arg)
{
    if (freefn != NULL)
        freefn(v, arg);

    inj_free(v, sizeof (inj_var_t));
}

void
inj_hash_destroy(inj_hash_t *h, void (*freefn)(inj_var_t *, void *), void *arg)
{
    inj_var_t *v, *w;
    size_t i;

    for (i = 0; i < h->h_hashsz; i++) {
        for (v = h->h_hash[i]; v != NULL; v = w) {
            w = v->v_next;
            inj_var_free(v, freefn, arg);
        }
    }

    inj_free(h->h_hash, sizeof (inj_var_t *) * INJ_HASHSZ);
}

int
inj_hash_insert(inj_hash_t *h, void *key, uintmax_t value)
{
    size_t i = h->h_hashfn(key) % h->h_hashsz;
    inj_var_t *v;

    for (v = h->h_hash[i]; v != NULL; v = v->v_next) {
        if (h->h_cmpfn(v->v_key, key) == 0)
            return (-1);
    }

    /* not found - make a new one */
    v = inj_var_alloc(key, value, h->h_hash[i]);
    h->h_hash[i] = v;
    h->h_nelems++;

    return (0);
}

inj_var_t *
inj_hash_lookup(inj_hash_t *h, void *key)
{
    size_t i = h->h_hashfn(key) % h->h_hashsz;
    inj_var_t *v;

    for (v = h->h_hash[i]; v != NULL; v = v->v_next) {
        if (h->h_cmpfn(v->v_key, key) == 0)
            return (v);
    }

    return (NULL);
}

void *
inj_hash_get_key(inj_var_t *v)
{
    return (v->v_key);
}

uintmax_t
inj_hash_get_value(inj_var_t *v)
{
    return (v->v_uvalue);
}

void *
inj_hash_get_cookie(inj_var_t *v)
{
    return ((void *)v->v_uvalue);
}