1  /* Ensure that malloc_usable_size returns the request size with
       2     MALLOC_CHECK_ exported to a positive value.
       3  
       4     Copyright (C) 2012-2023 Free Software Foundation, Inc.
       5     Copyright The GNU Toolchain Authors.
       6     This file is part of the GNU C Library.
       7  
       8     The GNU C Library is free software; you can redistribute it and/or
       9     modify it under the terms of the GNU Lesser General Public
      10     License as published by the Free Software Foundation; either
      11     version 2.1 of the License, or (at your option) any later version.
      12  
      13     The GNU C Library is distributed in the hope that it will be useful,
      14     but WITHOUT ANY WARRANTY; without even the implied warranty of
      15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16     Lesser General Public License for more details.
      17  
      18     You should have received a copy of the GNU Lesser General Public
      19     License along with the GNU C Library; if not, see
      20     <https://www.gnu.org/licenses/>.  */
      21  
      22  #include <malloc.h>
      23  #include <string.h>
      24  #include <stdio.h>
      25  #include <support/support.h>
      26  #include <support/check.h>
      27  
      28  static int
      29  do_test (void)
      30  {
      31    size_t usable_size;
      32    void *p = malloc (7);
      33  
      34    TEST_VERIFY_EXIT (p != NULL);
      35    usable_size = malloc_usable_size (p);
      36    TEST_COMPARE (usable_size, 7);
      37    memset (p, 0, usable_size);
      38    free (p);
      39  
      40    TEST_COMPARE (malloc_usable_size (NULL), 0);
      41  
      42    return 0;
      43  }
      44  
      45  #include "support/test-driver.c"