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, 2009-2012 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 1
24# undef calloc
25/* Whereas the gnulib module 'calloc-gnu' defines HAVE_CALLOC_GNU.  */
26#elif GNULIB_CALLOC_GNU && !HAVE_CALLOC_GNU
27# define NEED_CALLOC_GNU 1
28#endif
29
30/* Specification.  */
31#include <stdlib.h>
32
33#include <errno.h>
34
35/* Call the system's calloc below.  */
36#undef calloc
37
38/* Allocate and zero-fill an NxS-byte block of memory from the heap.
39   If N or S is zero, allocate and zero-fill a 1-byte block.  */
40
41void *
42rpl_calloc (size_t n, size_t s)
43{
44  void *result;
45
46#if NEED_CALLOC_GNU
47  if (n == 0 || s == 0)
48    {
49      n = 1;
50      s = 1;
51    }
52  else
53    {
54      /* Defend against buggy calloc implementations that mishandle
55         size_t overflow.  */
56      size_t bytes = n * s;
57      if (bytes / s != n)
58        {
59          errno = ENOMEM;
60          return NULL;
61        }
62    }
63#endif
64
65  result = calloc (n, s);
66
67#if !HAVE_CALLOC_POSIX
68  if (result == NULL)
69    errno = ENOMEM;
70#endif
71
72  return result;
73}
74