1 /* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues.
2 
3    Copyright (C) 2009-2012 Free Software Foundation, Inc.
4 
5    This program is free software; you can redistribute it and/or modify
6    it under the terms of the GNU General Public License as published by
7    the Free Software Foundation; either version 3, or (at your option)
8    any later version.
9 
10    This program is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13    GNU General Public License for more details.
14 
15    You should have received a copy of the GNU General Public License
16    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
17 
18 /* Written by Eric Blake.  */
19 
20 /*
21  * POSIX 2008 <stddef.h> for platforms that have issues.
22  * <http://www.opengroup.org/susv3xbd/stddef.h.html>
23  */
24 
25 #if __GNUC__ >= 3
26 @PRAGMA_SYSTEM_HEADER@
27 #endif
28 @PRAGMA_COLUMNS@
29 
30 #if defined __need_wchar_t || defined __need_size_t  \
31   || defined __need_ptrdiff_t || defined __need_NULL \
32   || defined __need_wint_t
33 /* Special invocation convention inside gcc header files.  In
34    particular, gcc provides a version of <stddef.h> that blindly
35    redefines NULL even when __need_wint_t was defined, even though
36    wint_t is not normally provided by <stddef.h>.  Hence, we must
37    remember if special invocation has ever been used to obtain wint_t,
38    in which case we need to clean up NULL yet again.  */
39 
40 # if !(defined _@GUARD_PREFIX@_STDDEF_H && defined _GL_STDDEF_WINT_T)
41 #  ifdef __need_wint_t
42 #   undef _@GUARD_PREFIX@_STDDEF_H
43 #   define _GL_STDDEF_WINT_T
44 #  endif
45 #  @INCLUDE_NEXT@ @NEXT_STDDEF_H@
46 # endif
47 
48 #else
49 /* Normal invocation convention.  */
50 
51 # ifndef _@GUARD_PREFIX@_STDDEF_H
52 
53 /* The include_next requires a split double-inclusion guard.  */
54 
55 #  @INCLUDE_NEXT@ @NEXT_STDDEF_H@
56 
57 #  ifndef _@GUARD_PREFIX@_STDDEF_H
58 #   define _@GUARD_PREFIX@_STDDEF_H
59 
60 /* On NetBSD 5.0, the definition of NULL lacks proper parentheses.  */
61 #if @REPLACE_NULL@
62 # undef NULL
63 # ifdef __cplusplus
64    /* ISO C++ says that the macro NULL must expand to an integer constant
65       expression, hence '((void *) 0)' is not allowed in C++.  */
66 #  if __GNUG__ >= 3
67     /* GNU C++ has a __null macro that behaves like an integer ('int' or
68        'long') but has the same size as a pointer.  Use that, to avoid
69        warnings.  */
70 #   define NULL __null
71 #  else
72 #   define NULL 0L
73 #  endif
74 # else
75 #  define NULL ((void *) 0)
76 # endif
77 #endif
78 
79 /* Some platforms lack wchar_t.  */
80 #if !@HAVE_WCHAR_T@
81 # define wchar_t int
82 #endif
83 
84 #  endif /* _@GUARD_PREFIX@_STDDEF_H */
85 # endif /* _@GUARD_PREFIX@_STDDEF_H */
86 #endif /* __need_XXX */
87