usr/src/lib/libmapmalloc/common/calloc.c

   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 }