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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 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Much like calloc, but with functions to report the size of the
* allocation given only the pointer.
*/
#include <assert.h>
#include <string.h>
#include <malloc.h>
#include "sized_array.h"
/*
* Assumes that int is at least 32 bits and that nothing needs more than
* 8-byte alignment.
*/
/* COOKIE provides some bad-pointer protection. */
#define COOKIE "SACOOKIE"
struct sized_array {
int n;
int sz;
#if defined(COOKIE)
char cookie[8];
#endif
};
void *
sized_array(size_t n, size_t sz)
{
struct sized_array *sa;
size_t total;
total = sizeof (struct sized_array) + n*sz;
sa = malloc(total);
if (sa == NULL)
return (NULL);
(void) memset(sa, 0, total);
sa->n = n;
sa->sz = sz;
#if defined(COOKIE)
(void) memcpy(sa->cookie, COOKIE, sizeof (sa->cookie));
#endif
return ((void *)(sa + 1));
}
void
sized_array_free(void *p)
{
struct sized_array *sa;
if (p == NULL)
return;
sa = ((struct sized_array *)p)-1;
#if defined(COOKIE)
assert(memcmp(sa->cookie, COOKIE, sizeof (sa->cookie)) == 0);
#endif
free(sa);
}
size_t
sized_array_n(void *p)
{
struct sized_array *sa;
sa = ((struct sized_array *)p)-1;
#if defined(COOKIE)
assert(memcmp(sa->cookie, COOKIE, sizeof (sa->cookie)) == 0);
#endif
return (sa->n);
}
size_t
sized_array_sz(void *p)
{
struct sized_array *sa;
sa = ((struct sized_array *)p)-1;
#if defined(COOKIE)
assert(memcmp(sa->cookie, COOKIE, sizeof (sa->cookie)) == 0);
#endif
return (sa->sz);
}
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