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      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 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #include "lint.h"
     33 #include <stdlib.h>
     34 #include <string.h>
     35 #include <errno.h>
     36 
     37 /*
     38  * calloc - allocate and clear memory block
     39  */
     40 void *
     41 calloc(size_t num, size_t size)
     42 {
     43 	void *mp;
     44 	size_t total;
     45 
     46 	if (num == 0 || size == 0)
     47 		total = 0;
     48 	else {
     49 		total = num * size;
     50 
     51 		/* check for overflow */
     52 		if (total / num != size) {
     53 			errno = ENOMEM;
     54 			return (0);
     55 		}
     56 	}
     57 	return ((mp = malloc(total)) ? memset(mp, 0, total) : mp);
     58 }
     59