gl/tests/test-stddef.c

   1 /* Test of <stddef.h> substitute.
   2    Copyright (C) 2009-2012 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 <http://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Eric Blake <ebb9@byu.net>, 2009.  */
  18
  19 #include <config.h>
  20
  21 #include <stddef.h>
  22
  23 #include "verify.h"
  24
  25 /* Check that appropriate types are defined.  */
  26 wchar_t a = 'c';
  27 ptrdiff_t b = 1;
  28 size_t c = 2;
  29
  30 /* Check that NULL can be passed through varargs as a pointer type,
  31    per POSIX 2008.  */
  32 verify (sizeof NULL == sizeof (void *));
  33
  34 /* Check that offsetof produces integer constants with correct type.  */
  35 struct d
  36 {
  37   char e;
  38   char f;
  39 };
  40 /* Solaris 10 has a bug where offsetof is under-parenthesized, and
  41    cannot be used as an arbitrary expression.  However, since it is
  42    unlikely to bite real code, we ignore that short-coming.  */
  43 /* verify (sizeof offsetof (struct d, e) == sizeof (size_t)); */
  44 verify (sizeof (offsetof (struct d, e)) == sizeof (size_t));
  45 verify (offsetof (struct d, e) < -1); /* Must be unsigned.  */
  46 verify (offsetof (struct d, f) == 1);
  47
  48 int
  49 main (void)
  50 {
  51   return 0;
  52 }