/*
 * 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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <fmd_alloc.h>
#include <fmd_string.h>
#include <fmd_subr.h>
#include <fmd_buf.h>
#include <fmd.h>

static fmd_buf_t *
fmd_buf_alloc(const char *name, size_t size)
{
        fmd_buf_t *bp = fmd_alloc(sizeof (fmd_buf_t), FMD_SLEEP);

        bp->buf_name = fmd_strdup(name, FMD_SLEEP);
        bp->buf_next = NULL;
        bp->buf_data = fmd_zalloc(size, FMD_SLEEP);
        bp->buf_size = size;
        bp->buf_flags = FMD_BUF_DIRTY;

        return (bp);
}

static void
fmd_buf_free(fmd_buf_t *bp)
{
        fmd_strfree(bp->buf_name);
        fmd_free(bp->buf_data, bp->buf_size);
        fmd_free(bp, sizeof (fmd_buf_t));
}

void
fmd_buf_hash_create(fmd_buf_hash_t *bhp)
{
        bhp->bh_hashlen = fmd.d_str_buckets;
        bhp->bh_hash = fmd_zalloc(sizeof (void *) * bhp->bh_hashlen, FMD_SLEEP);
        bhp->bh_count = 0;
}

size_t
fmd_buf_hash_destroy(fmd_buf_hash_t *bhp)
{
        size_t total = 0;
        fmd_buf_t *bp, *np;
        uint_t i;

        for (i = 0; i < bhp->bh_hashlen; i++) {
                for (bp = bhp->bh_hash[i]; bp != NULL; bp = np) {
                        np = bp->buf_next;
                        total += bp->buf_size;
                        fmd_buf_free(bp);
                }
        }

        fmd_free(bhp->bh_hash, sizeof (void *) * bhp->bh_hashlen);
        bzero(bhp, sizeof (fmd_buf_hash_t));
        return (total);
}

void
fmd_buf_hash_apply(fmd_buf_hash_t *bhp, fmd_buf_f *func, void *arg)
{
        fmd_buf_t *bp;
        uint_t i;

        for (i = 0; i < bhp->bh_hashlen; i++) {
                for (bp = bhp->bh_hash[i]; bp != NULL; bp = bp->buf_next)
                        func(bp, arg);
        }
}

void
fmd_buf_hash_commit(fmd_buf_hash_t *bhp)
{
        fmd_buf_t *bp;
        uint_t i;

        for (i = 0; i < bhp->bh_hashlen; i++) {
                for (bp = bhp->bh_hash[i]; bp != NULL; bp = bp->buf_next)
                        bp->buf_flags &= ~FMD_BUF_DIRTY;
        }
}

uint_t
fmd_buf_hash_count(fmd_buf_hash_t *bhp)
{
        return (bhp->bh_count);
}

fmd_buf_t *
fmd_buf_insert(fmd_buf_hash_t *bhp, const char *name, size_t size)
{
        uint_t h = fmd_strhash(name) % bhp->bh_hashlen;
        fmd_buf_t *bp = fmd_buf_alloc(name, size);

        bp->buf_next = bhp->bh_hash[h];
        bhp->bh_hash[h] = bp;
        bhp->bh_count++;

        return (bp);
}

fmd_buf_t *
fmd_buf_lookup(fmd_buf_hash_t *bhp, const char *name)
{
        uint_t h = fmd_strhash(name) % bhp->bh_hashlen;
        fmd_buf_t *bp;

        for (bp = bhp->bh_hash[h]; bp != NULL; bp = bp->buf_next) {
                if (strcmp(name, bp->buf_name) == 0)
                        return (bp);
        }

        return (NULL);
}

void
fmd_buf_delete(fmd_buf_hash_t *bhp, const char *name)
{
        uint_t h = fmd_strhash(name) % bhp->bh_hashlen;
        fmd_buf_t *bp, **pp = &bhp->bh_hash[h];

        for (bp = *pp; bp != NULL; bp = bp->buf_next) {
                if (strcmp(bp->buf_name, name) != 0)
                        pp = &bp->buf_next;
                else
                        break;
        }

        if (bp != NULL) {
                *pp = bp->buf_next;
                fmd_buf_free(bp);
                ASSERT(bhp->bh_count != 0);
                bhp->bh_count--;
        }
}