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/* Copyright (C) 2000-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <limits.h>
#include <malloc.h>
#include <stdlib.h>
#include <stdio.h>
#include <libc-diag.h>
#include "tst-malloc-aux.h"
/* Number of samples per size. */
#define N 50000
static void
fixed_test (int size)
{
char *ptrs[N];
int i;
for (i = 0; i < N; ++i)
{
int j;
ptrs[i] = (char *) calloc (1, size);
if (ptrs[i] == NULL)
break;
for (j = 0; j < size; ++j)
{
if (ptrs[i][j] != '\0')
error (EXIT_FAILURE, 0,
"byte not cleared (size %d, element %d, byte %d)",
size, i, j);
ptrs[i][j] = '\xff';
}
}
while (i-- > 0)
free (ptrs[i]);
}
static void
random_test (void)
{
char *ptrs[N];
int i;
for (i = 0; i < N; ++i)
{
int j;
int n = 1 + random () % 10;
int elem = 1 + random () % 100;
int size = n * elem;
ptrs[i] = (char *) calloc (n, elem);
if (ptrs[i] == NULL)
break;
for (j = 0; j < size; ++j)
{
if (ptrs[i][j] != '\0')
error (EXIT_FAILURE, 0,
"byte not cleared (size %d, element %d, byte %d)",
size, i, j);
ptrs[i][j] = '\xff';
}
}
while (i-- > 0)
free (ptrs[i]);
}
static void
null_test (void)
{
/* Obscure allocation size from the compiler. */
volatile size_t max_size = UINT_MAX;
volatile size_t zero_size = 0;
/* If the size is 0 the result is implementation defined. Just make
sure the program doesn't crash. The result of calloc is
deliberately ignored, so do not warn about that. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (10, "-Wunused-result");
calloc (0, 0);
calloc (0, max_size);
calloc (max_size, 0);
calloc (0, ~zero_size);
calloc (~zero_size, 0);
DIAG_POP_NEEDS_COMMENT;
}
static int
do_test (void)
{
/* We are allocating blocks with `calloc' and check whether every
block is completely cleared. We first try this for some fixed
times and then with random size. */
fixed_test (15);
fixed_test (5);
fixed_test (17);
fixed_test (6);
fixed_test (31);
fixed_test (96);
random_test ();
null_test ();
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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