1/* calloc() function that is glibc compatible.
2   This wrapper function is required at least on Tru64 UNIX 5.1 and mingw.
3   Copyright (C) 2004-2007, 2009-2010 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 3 of the License, or
8   (at your option) 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, see <http://www.gnu.org/licenses/>.  */
17
18/* written by Jim Meyering and Bruno Haible */
19
20#include <config.h>
21/* Only the AC_FUNC_CALLOC macro defines 'calloc' already in config.h.  */
22#ifdef calloc
23# define NEED_CALLOC_GNU
24# undef calloc
25#endif
26
27/* Specification.  */
28#include <stdlib.h>
29
30#include <errno.h>
31
32/* Call the system's calloc below.  */
33#undef calloc
34
35/* Allocate and zero-fill an NxS-byte block of memory from the heap.
36   If N or S is zero, allocate and zero-fill a 1-byte block.  */
37
38void *
39rpl_calloc (size_t n, size_t s)
40{
41  void *result;
42
43#ifdef NEED_CALLOC_GNU
44  if (n == 0 || s == 0)
45    {
46      n = 1;
47      s = 1;
48    }
49  else
50    {
51      /* Defend against buggy calloc implementations that mishandle
52         size_t overflow.  */
53      size_t bytes = n * s;
54      if (bytes / s != n)
55        {
56          errno = ENOMEM;
57          return NULL;
58        }
59    }
60#endif
61
62  result = calloc (n, s);
63
64#if !HAVE_CALLOC_POSIX
65  if (result == NULL)
66    errno = ENOMEM;
67#endif
68
69  return result;
70}
71