1  /* Test of largefile module.
       2     Copyright (C) 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>, 2023.  */
      18  
      19  /* This test may fail if AC_SYS_LARGEFILE could not arrange for a 64-bit off_t.
      20     This should be rare, though: only very old systems don't have support for
      21     files larger than 2 GiB.  */
      22  
      23  #include <config.h>
      24  
      25  #include <sys/types.h>
      26  #include <sys/stat.h>
      27  #include "intprops.h"
      28  
      29  /* Although these tests could be done with static_assert, the test
      30     harness prefers dynamic checking.  */
      31  
      32  int
      33  main (void)
      34  {
      35    int result = 0;
      36  
      37    /* Check the range of off_t.
      38       With MSVC, this test succeeds only thanks to the 'sys_types' module.  */
      39    if (TYPE_MAXIMUM (off_t) >> 31 >> 31 == 0)
      40      result |= 1;
      41  
      42    /* Check the size of the 'struct stat' field 'st_size'.
      43       With MSVC, this test succeeds only thanks to the 'sys_stat' module.  */
      44    {
      45      struct stat st;
      46      if (sizeof st.st_size != sizeof (off_t))
      47        result |= 2;
      48    }
      49  
      50    return result;
      51  }