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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) 2004-2007, 2009-2020 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 <https://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 1
# undef calloc
/* Whereas the gnulib module 'calloc-gnu' defines HAVE_CALLOC_GNU. */
#elif GNULIB_CALLOC_GNU && !HAVE_CALLOC_GNU
# define NEED_CALLOC_GNU 1
#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;
#if 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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