/* Test for reallocarray.

   Copyright (C) 2017-2018 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

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <malloc.h>

#include <string.h>

#include <support/check.h>

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 (NULL, max, 2);

  TEST_VERIFY (!ptr);

  TEST_VERIFY (errno == ENOMEM);

  errno = 0;

  ptr = reallocarray (NULL, 2, max);

  TEST_VERIFY (!ptr);

  TEST_VERIFY (errno == ENOMEM);

  a = 65537;

  b = max/65537 + 1;

  errno = 0;

  ptr = reallocarray (NULL, a, b);

  TEST_VERIFY (!ptr);

  TEST_VERIFY (errno == ENOMEM);

  errno = 0;

  ptr = reallocarray (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 (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>