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/* Test for reallocarray.
Copyright (C) 2017-2025 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 <malloc.h>
#include <string.h>
#include <support/check.h>
#include <libc-diag.h>
static void *
reallocarray_nowarn (void *ptr, size_t nmemb, size_t size)
{
#if __GNUC_PREREQ (7, 0)
/* GCC 7 warns about too-large allocations; here we want to test
that they fail. */
DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
#endif
void *ret = reallocarray (ptr, nmemb, size);
#if __GNUC_PREREQ (7, 0)
DIAG_POP_NEEDS_COMMENT;
#endif
return ret;
}
static int
do_test (void)
{
void *ptr = NULL;
void *ptr2 = NULL;
unsigned char *c;
size_t i;
int ok;
const size_t max = ~(size_t)0;
size_t a, b;
/* Test overflow detection. */
errno = 0;
ptr = reallocarray_nowarn (NULL, max, 2);
TEST_VERIFY (!ptr);
TEST_VERIFY (errno == ENOMEM);
errno = 0;
ptr = reallocarray_nowarn (NULL, 2, max);
TEST_VERIFY (!ptr);
TEST_VERIFY (errno == ENOMEM);
a = 65537;
b = max/65537 + 1;
errno = 0;
ptr = reallocarray_nowarn (NULL, a, b);
TEST_VERIFY (!ptr);
TEST_VERIFY (errno == ENOMEM);
errno = 0;
ptr = reallocarray_nowarn (NULL, b, a);
TEST_VERIFY (!ptr);
TEST_VERIFY (errno == ENOMEM);
/* Test realloc-like behavior. */
/* Allocate memory like malloc. */
ptr = reallocarray (NULL, 10, 2);
TEST_VERIFY_EXIT (ptr);
TEST_VERIFY_EXIT (malloc_usable_size (ptr) >= 10*2);
memset (ptr, 0xAF, 10*2);
/* Enlarge buffer. */
ptr2 = reallocarray (ptr, 20, 2);
TEST_VERIFY (ptr2);
if (ptr2)
ptr = ptr2;
TEST_VERIFY (malloc_usable_size (ptr) >= 20*2);
c = ptr;
ok = 1;
for (i = 0; i < 10*2; ++i)
{
if (c[i] != 0xAF)
ok = 0;
}
TEST_VERIFY (ok);
/* Decrease buffer size. */
ptr2 = reallocarray (ptr, 5, 3);
TEST_VERIFY (ptr2);
if (ptr2)
ptr = ptr2;
TEST_VERIFY_EXIT (malloc_usable_size (ptr) >= 5*3);
c = ptr;
ok = 1;
for (i = 0; i < 5*3; ++i)
{
if (c[i] != 0xAF)
ok = 0;
}
TEST_VERIFY (ok);
/* Overflow should leave buffer untouched. */
errno = 0;
ptr2 = reallocarray_nowarn (ptr, 2, ~(size_t)0);
TEST_VERIFY (!ptr2);
TEST_VERIFY (errno == ENOMEM);
c = ptr;
ok = 1;
for (i = 0; i < 5*3; ++i)
{
if (c[i] != 0xAF)
ok = 0;
}
TEST_VERIFY (ok);
free (ptr);
return 0;
}
#include <support/test-driver.c>
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