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/* calloc() function that is glibc compatible.
This wrapper function is required at least on Tru64 UNIX 5.1 and mingw.
Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* written by Jim Meyering and Bruno Haible */
#include <config.h>
/* Only the AC_FUNC_CALLOC macro defines 'calloc' already in config.h. */
#ifdef calloc
# define NEED_CALLOC_GNU
# undef calloc
#endif
/* Specification. */
#include <stdlib.h>
#include <errno.h>
/* Call the system's calloc below. */
#undef calloc
/* Allocate and zero-fill an NxS-byte block of memory from the heap.
If N or S is zero, allocate and zero-fill a 1-byte block. */
void *
rpl_calloc (size_t n, size_t s)
{
void *result;
#ifdef NEED_CALLOC_GNU
if (n == 0 || s == 0)
{
n = 1;
s = 1;
}
else
{
/* Defend against buggy calloc implementations that mishandle
size_t overflow. */
size_t bytes = n * s;
if (bytes / s != n)
{
errno = ENOMEM;
return NULL;
}
}
#endif
result = calloc (n, s);
#if !HAVE_CALLOC_POSIX
if (result == NULL)
errno = ENOMEM;
#endif
return result;
}
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