/*
 * 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 Ricardo Correia.  All rights reserved.
 * Use is subject to license terms.
 */

#include <umem.h>
#include <stdlib.h>
#include <assert.h>

static umem_nofail_callback_t *nofail_cb = NULL;

struct umem_cache {
        umem_constructor_t *constructor;
        umem_destructor_t *destructor;
        void *callback_data;
        size_t bufsize;
};

/*
 * Simple stub for umem_alloc(). The callback isn't expected to return.
 */
void *umem_alloc(size_t size, int flags)
{
        assert(flags == UMEM_DEFAULT || flags == UMEM_NOFAIL);

        if(size == 0)
                return NULL;

        void *ret = malloc(size);
        if(ret == NULL) {
                if(!(flags & UMEM_NOFAIL))
                        return NULL;

                if(nofail_cb != NULL)
                        nofail_cb();
                abort();
        }

        return ret;
}

/*
 * Simple stub for umem_zalloc().
 */
void *umem_zalloc(size_t size, int flags)
{
        assert(flags == UMEM_DEFAULT || flags == UMEM_NOFAIL);

        if(size == 0)
                return NULL;

        void *ret = calloc(1, size);
        if(ret == NULL) {
                if(!(flags & UMEM_NOFAIL))
                        return NULL;

                if(nofail_cb != NULL)
                        nofail_cb();
                abort();
        }

        return ret;
}

/*
 * Simple stub for umem_free().
 */
void umem_free(void *buf, size_t size)
{
        free(buf);
}

/*
 * Simple stub for umem_nofail_callback().
 */
void umem_nofail_callback(umem_nofail_callback_t *callback)
{
        nofail_cb = callback;
}

/*
 * Simple stub for umem_cache_create().
 */
umem_cache_t *umem_cache_create(char *debug_name, size_t bufsize, size_t align, umem_constructor_t *constructor, umem_destructor_t *destructor, umem_reclaim_t *reclaim, void *callback_data, void *source, int cflags)
{
        assert(source == NULL);

        umem_cache_t *cache = malloc(sizeof(umem_cache_t));
        if(cache == NULL)
                return NULL;

        cache->constructor = constructor;
        cache->destructor = destructor;
        cache->callback_data = callback_data;
        cache->bufsize = bufsize;

        return cache;
}

/*
 * Simple stub for umem_cache_alloc(). The nofail callback isn't expected to return.
 */
void *umem_cache_alloc(umem_cache_t *cache, int flags)
{
        void *buf = malloc(cache->bufsize);
        if(buf == NULL) {
                if(!(flags & UMEM_NOFAIL))
                        return NULL;

                if(nofail_cb != NULL)
                        nofail_cb();
                abort();
        }

        if(cache->constructor != NULL) {
                if(cache->constructor(buf, cache->callback_data, flags) != 0) {
                        free(buf);
                        if(!(flags & UMEM_NOFAIL))
                                return NULL;

                        if(nofail_cb != NULL)
                                nofail_cb();
                        abort();
                }
        }

        return buf;
}

/*
 * Simple stub for umem_cache_free().
 */
void umem_cache_free(umem_cache_t *cache, void *buffer)
{
        if(cache->destructor != NULL)
                cache->destructor(buffer, cache->callback_data);

        free(buffer);
}

/*
 * Simple stub for umem_cache_destroy().
 */
void umem_cache_destroy(umem_cache_t *cache)
{
        free(cache);
}