1  /* Test of optional automatic memory allocation.
       2     Copyright (C) 2005, 2007, 2009-2023 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  /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
      18  
      19  #include <config.h>
      20  
      21  #include <alloca.h>
      22  
      23  #if HAVE_ALLOCA
      24  
      25  static void
      26  do_allocation (int n)
      27  {
      28    void *volatile ptr = alloca (n);
      29    (void) ptr;
      30  }
      31  
      32  void (*func) (int) = do_allocation;
      33  
      34  #endif
      35  
      36  int
      37  main ()
      38  {
      39  #if HAVE_ALLOCA
      40    int i;
      41  
      42    /* Repeat a lot of times, to make sure there's no memory leak.  */
      43    for (i = 0; i < 100000; i++)
      44      {
      45        /* Try various values.
      46           n = 0 gave a crash on Alpha with gcc-2.5.8.
      47           Some versions of Mac OS X have a stack size limit of 512 KB.  */
      48        func (34);
      49        func (134);
      50        func (399);
      51        func (510823);
      52        func (129321);
      53        func (0);
      54        func (4070);
      55        func (4095);
      56        func (1);
      57        func (16582);
      58      }
      59  #endif
      60  
      61    return 0;
      62  }