xref: /titanic_52/usr/src/lib/libmapmalloc/common/calloc.c (revision a29e56d91db891741f1af9f6bbd3e3c3cac5f19b)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 
31 /*
32  * calloc - allocate and clear memory block
33  */
34 
35 void *
36 calloc(size_t num, size_t size)
37 {
38 	void *mp;
39 	size_t total;
40 
41 	if (num == 0 || size == 0) {
42 		total = 0;
43 	} else {
44 		total = num * size;
45 
46 		/* check for overflow */
47 		if ((total / num) != size) {
48 			errno = ENOMEM;
49 			return (NULL);
50 		}
51 	}
52 
53 	mp = malloc(total);
54 	if (mp == NULL)
55 		return (NULL);
56 	(void) memset(mp, 0, total);
57 	return (mp);
58 }
59 
60 /*ARGSUSED*/
61 void
62 cfree(void *p, size_t num, size_t size)
63 {
64 	free(p);
65 }
66