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/* Test of calloc function.
Copyright (C) 2010-2021 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/>. */
#include <config.h>
/* Specification. */
#include <stdlib.h>
#include <errno.h>
#include <stdint.h>
#include "macros.h"
/* Return N.
Usual compilers are not able to infer something about the return value. */
static size_t
identity (size_t n)
{
unsigned int x = rand ();
unsigned int y = x * x * x * x;
x++; y |= x * x * x * x;
x++; y |= x * x * x * x;
x++; y |= x * x * x * x;
y = y >> 1;
y &= -y;
y -= 8;
/* At this point Y is zero but GCC doesn't infer this. */
return n + y;
}
int
main ()
{
/* Check that calloc (0, 0) is not a NULL pointer. */
{
void * volatile p = calloc (0, 0);
ASSERT (p != NULL);
free (p);
}
/* Check that calloc fails when requested to allocate a block of memory
larger than PTRDIFF_MAX or SIZE_MAX bytes.
Use 'identity' to avoid a compiler warning from GCC 7.
'volatile' is needed to defeat an incorrect optimization by clang 10,
see <https://bugs.llvm.org/show_bug.cgi?id=46055>. */
{
for (size_t n = 2; n != 0; n <<= 1)
{
void *volatile p = calloc (PTRDIFF_MAX / n + 1, identity (n));
ASSERT (p == NULL);
ASSERT (errno == ENOMEM);
p = calloc (SIZE_MAX / n + 1, identity (n));
ASSERT (p == NULL);
ASSERT (errno == ENOMEM);
}
}
return 0;
}
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