1/* calloc() function that is glibc compatible.
2   This wrapper function is required at least on Tru64 UNIX 5.1.
3   Copyright (C) 2004, 2005 Free Software Foundation, Inc.
4
5   This program is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 2, or (at your option)
8   any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program; if not, write to the Free Software Foundation,
17   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
18
19/* written by Jim Meyering */
20
21#ifdef HAVE_CONFIG_H
22# include <config.h>
23#endif
24#undef calloc
25
26#include <stdlib.h>
27
28/* Allocate and zero-fill an NxS-byte block of memory from the heap.
29   If N or S is zero, allocate and zero-fill a 1-byte block.  */
30
31void *
32rpl_calloc (size_t n, size_t s)
33{
34  size_t bytes;
35
36  if (n == 0 || s == 0)
37    return calloc (1, 1);
38
39  /* Defend against buggy calloc implementations that mishandle
40     size_t overflow.  */
41  bytes = n * s;
42  if (bytes / s != n)
43    return NULL;
44
45  return calloc (n, s);
46}
47