1  /* Test of malloc function.
       2     Copyright (C) 2010-2023 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation, either version 3 of the License, or
       7     (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  #include <config.h>
      18  
      19  /* Specification.  */
      20  #include <stdlib.h>
      21  
      22  #include <errno.h>
      23  #include <stdint.h>
      24  
      25  #include "macros.h"
      26  
      27  int
      28  main (int argc, _GL_UNUSED char **argv)
      29  {
      30    /* Check that malloc (0) is not a NULL pointer.  */
      31    void *volatile p = malloc (0);
      32    ASSERT (p != NULL);
      33    free (p);
      34  
      35    /* Check that malloc (n) fails when n exceeds PTRDIFF_MAX.  */
      36    if (PTRDIFF_MAX < SIZE_MAX)
      37      {
      38        size_t one = argc != 12345;
      39        p = malloc (PTRDIFF_MAX + one);
      40        ASSERT (p == NULL);
      41        ASSERT (errno == ENOMEM);
      42      }
      43  
      44    return 0;
      45  }