tests/test-largefile.c

   1 /* Test of largefile module.
   2    Copyright (C) 2023-2024 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 }