gcc/ginclude/stddef.h

   1 /* Copyright (C) 1989, 1997, 1998, 1999, 2000, 2002, 2004, 2009
   2    Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25 /*
  26  * ISO C Standard:  7.17  Common definitions  <stddef.h>
  27  */
  28 #if (!defined(_STDDEF_H) && !defined(_STDDEF_H_) && !defined(_ANSI_STDDEF_H) \
  29      && !defined(__STDDEF_H__)) \
  30     || defined(__need_wchar_t) || defined(__need_size_t) \
  31     || defined(__need_ptrdiff_t) || defined(__need_NULL) \
  32     || defined(__need_wint_t)
  33
  34 /* Any one of these symbols __need_* means that GNU libc
  35    wants us just to define one data type.  So don't define
  36    the symbols that indicate this file's entire job has been done.  */
  37 #if (!defined(__need_wchar_t) && !defined(__need_size_t)        \
  38      && !defined(__need_ptrdiff_t) && !defined(__need_NULL)     \
  39      && !defined(__need_wint_t))
  40 #define _STDDEF_H
  41 #define _STDDEF_H_
  42 /* snaroff@next.com says the NeXT needs this.  */
  43 #define _ANSI_STDDEF_H
  44 /* Irix 5.1 needs this.  */
  45 #define __STDDEF_H__
  46 #endif
  47
  48 #ifndef __sys_stdtypes_h
  49 /* This avoids lossage on SunOS but only if stdtypes.h comes first.
  50    There's no way to win with the other order!  Sun lossage.  */
  51
  52 /* On 4.3bsd-net2, make sure ansi.h is included, so we have
  53    one less case to deal with in the following.  */
  54 #if defined (__BSD_NET2__) || defined (____386BSD____) || (defined (__FreeBSD__) && (__FreeBSD__ < 5)) || defined(__NetBSD__)
  55 #include <machine/ansi.h>
  56 #endif
  57 /* On FreeBSD 5, machine/ansi.h does not exist anymore... */
  58 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
  59 #include <sys/_types.h>
  60 #endif
  61
  62 /* In 4.3bsd-net2, machine/ansi.h defines these symbols, which are
  63    defined if the corresponding type is *not* defined.
  64    FreeBSD-2.1 defines _MACHINE_ANSI_H_ instead of _ANSI_H_ */
  65 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_)
  66 #if !defined(_SIZE_T_) && !defined(_BSD_SIZE_T_)
  67 #define _SIZE_T
  68 #endif
  69 #if !defined(_PTRDIFF_T_) && !defined(_BSD_PTRDIFF_T_)
  70 #define _PTRDIFF_T
  71 #endif
  72 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
  73    instead of _WCHAR_T_. */
  74 #if !defined(_WCHAR_T_) && !defined(_BSD_WCHAR_T_)
  75 #ifndef _BSD_WCHAR_T_
  76 #define _WCHAR_T
  77 #endif
  78 #endif
  79 /* Undef _FOO_T_ if we are supposed to define foo_t.  */
  80 #if defined (__need_ptrdiff_t) || defined (_STDDEF_H_)
  81 #undef _PTRDIFF_T_
  82 #undef _BSD_PTRDIFF_T_
  83 #endif
  84 #if defined (__need_size_t) || defined (_STDDEF_H_)
  85 #undef _SIZE_T_
  86 #undef _BSD_SIZE_T_
  87 #endif
  88 #if defined (__need_wchar_t) || defined (_STDDEF_H_)
  89 #undef _WCHAR_T_
  90 #undef _BSD_WCHAR_T_
  91 #endif
  92 #endif /* defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) */
  93
  94 /* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
  95    Just ignore it.  */
  96 #if defined (__sequent__) && defined (_PTRDIFF_T_)
  97 #undef _PTRDIFF_T_
  98 #endif
  99
 100 /* On VxWorks, <type/vxTypesBase.h> may have defined macros like
 101    _TYPE_size_t which will typedef size_t.  fixincludes patched the
 102    vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
 103    not defined, and so that defining this macro defines _GCC_SIZE_T.
 104    If we find that the macros are still defined at this point, we must
 105    invoke them so that the type is defined as expected.  */
 106 #if defined (_TYPE_ptrdiff_t) && (defined (__need_ptrdiff_t) || defined (_STDDEF_H_))
 107 _TYPE_ptrdiff_t;
 108 #undef _TYPE_ptrdiff_t
 109 #endif
 110 #if defined (_TYPE_size_t) && (defined (__need_size_t) || defined (_STDDEF_H_))
 111 _TYPE_size_t;
 112 #undef _TYPE_size_t
 113 #endif
 114 #if defined (_TYPE_wchar_t) && (defined (__need_wchar_t) || defined (_STDDEF_H_))
 115 _TYPE_wchar_t;
 116 #undef _TYPE_wchar_t
 117 #endif
 118
 119 /* In case nobody has defined these types, but we aren't running under
 120    GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
 121    __WCHAR_TYPE__ have reasonable values.  This can happen if the
 122    parts of GCC is compiled by an older compiler, that actually
 123    include gstddef.h, such as collect2.  */
 124
 125 /* Signed type of difference of two pointers.  */
 126
 127 /* Define this type if we are doing the whole job,
 128    or if we want this type in particular.  */
 129 #if defined (_STDDEF_H) || defined (__need_ptrdiff_t)
 130 #ifndef _PTRDIFF_T      /* in case <sys/types.h> has defined it. */
 131 #ifndef _T_PTRDIFF_
 132 #ifndef _T_PTRDIFF
 133 #ifndef __PTRDIFF_T
 134 #ifndef _PTRDIFF_T_
 135 #ifndef _BSD_PTRDIFF_T_
 136 #ifndef ___int_ptrdiff_t_h
 137 #ifndef _GCC_PTRDIFF_T
 138 #define _PTRDIFF_T
 139 #define _T_PTRDIFF_
 140 #define _T_PTRDIFF
 141 #define __PTRDIFF_T
 142 #define _PTRDIFF_T_
 143 #define _BSD_PTRDIFF_T_
 144 #define ___int_ptrdiff_t_h
 145 #define _GCC_PTRDIFF_T
 146 #ifndef __PTRDIFF_TYPE__
 147 #define __PTRDIFF_TYPE__ long int
 148 #endif
 149 typedef __PTRDIFF_TYPE__ ptrdiff_t;
 150 #endif /* _GCC_PTRDIFF_T */
 151 #endif /* ___int_ptrdiff_t_h */
 152 #endif /* _BSD_PTRDIFF_T_ */
 153 #endif /* _PTRDIFF_T_ */
 154 #endif /* __PTRDIFF_T */
 155 #endif /* _T_PTRDIFF */
 156 #endif /* _T_PTRDIFF_ */
 157 #endif /* _PTRDIFF_T */
 158
 159 /* If this symbol has done its job, get rid of it.  */
 160 #undef  __need_ptrdiff_t
 161
 162 #endif /* _STDDEF_H or __need_ptrdiff_t.  */
 163
 164 /* Unsigned type of `sizeof' something.  */
 165
 166 /* Define this type if we are doing the whole job,
 167    or if we want this type in particular.  */
 168 #if defined (_STDDEF_H) || defined (__need_size_t)
 169 #ifndef __size_t__      /* BeOS */
 170 #ifndef __SIZE_T__      /* Cray Unicos/Mk */
 171 #ifndef _SIZE_T /* in case <sys/types.h> has defined it. */
 172 #ifndef _SYS_SIZE_T_H
 173 #ifndef _T_SIZE_
 174 #ifndef _T_SIZE
 175 #ifndef __SIZE_T
 176 #ifndef _SIZE_T_
 177 #ifndef _BSD_SIZE_T_
 178 #ifndef _SIZE_T_DEFINED_
 179 #ifndef _SIZE_T_DEFINED
 180 #ifndef _BSD_SIZE_T_DEFINED_    /* Darwin */
 181 #ifndef _SIZE_T_DECLARED        /* FreeBSD 5 */
 182 #ifndef ___int_size_t_h
 183 #ifndef _GCC_SIZE_T
 184 #ifndef _SIZET_
 185 #ifndef __size_t
 186 #define __size_t__      /* BeOS */
 187 #define __SIZE_T__      /* Cray Unicos/Mk */
 188 #define _SIZE_T
 189 #define _SYS_SIZE_T_H
 190 #define _T_SIZE_
 191 #define _T_SIZE
 192 #define __SIZE_T
 193 #define _SIZE_T_
 194 #define _BSD_SIZE_T_
 195 #define _SIZE_T_DEFINED_
 196 #define _SIZE_T_DEFINED
 197 #define _BSD_SIZE_T_DEFINED_    /* Darwin */
 198 #define _SIZE_T_DECLARED        /* FreeBSD 5 */
 199 #define ___int_size_t_h
 200 #define _GCC_SIZE_T
 201 #define _SIZET_
 202 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
 203 /* __size_t is a typedef on FreeBSD 5!, must not trash it. */
 204 #else
 205 #define __size_t
 206 #endif
 207 #ifndef __SIZE_TYPE__
 208 #define __SIZE_TYPE__ long unsigned int
 209 #endif
 210 #if !(defined (__GNUG__) && defined (size_t))
 211 typedef __SIZE_TYPE__ size_t;
 212 #ifdef __BEOS__
 213 typedef long ssize_t;
 214 #endif /* __BEOS__ */
 215 #endif /* !(defined (__GNUG__) && defined (size_t)) */
 216 #endif /* __size_t */
 217 #endif /* _SIZET_ */
 218 #endif /* _GCC_SIZE_T */
 219 #endif /* ___int_size_t_h */
 220 #endif /* _SIZE_T_DECLARED */
 221 #endif /* _BSD_SIZE_T_DEFINED_ */
 222 #endif /* _SIZE_T_DEFINED */
 223 #endif /* _SIZE_T_DEFINED_ */
 224 #endif /* _BSD_SIZE_T_ */
 225 #endif /* _SIZE_T_ */
 226 #endif /* __SIZE_T */
 227 #endif /* _T_SIZE */
 228 #endif /* _T_SIZE_ */
 229 #endif /* _SYS_SIZE_T_H */
 230 #endif /* _SIZE_T */
 231 #endif /* __SIZE_T__ */
 232 #endif /* __size_t__ */
 233 #undef  __need_size_t
 234 #endif /* _STDDEF_H or __need_size_t.  */
 235
 236
 237 /* Wide character type.
 238    Locale-writers should change this as necessary to
 239    be big enough to hold unique values not between 0 and 127,
 240    and not (wchar_t) -1, for each defined multibyte character.  */
 241
 242 /* Define this type if we are doing the whole job,
 243    or if we want this type in particular.  */
 244 #if defined (_STDDEF_H) || defined (__need_wchar_t)
 245 #ifndef __wchar_t__     /* BeOS */
 246 #ifndef __WCHAR_T__     /* Cray Unicos/Mk */
 247 #ifndef _WCHAR_T
 248 #ifndef _T_WCHAR_
 249 #ifndef _T_WCHAR
 250 #ifndef __WCHAR_T
 251 #ifndef _WCHAR_T_
 252 #ifndef _BSD_WCHAR_T_
 253 #ifndef _BSD_WCHAR_T_DEFINED_    /* Darwin */
 254 #ifndef _BSD_RUNE_T_DEFINED_    /* Darwin */
 255 #ifndef _WCHAR_T_DECLARED /* FreeBSD 5 */
 256 #ifndef _WCHAR_T_DEFINED_
 257 #ifndef _WCHAR_T_DEFINED
 258 #ifndef _WCHAR_T_H
 259 #ifndef ___int_wchar_t_h
 260 #ifndef __INT_WCHAR_T_H
 261 #ifndef _GCC_WCHAR_T
 262 #define __wchar_t__     /* BeOS */
 263 #define __WCHAR_T__     /* Cray Unicos/Mk */
 264 #define _WCHAR_T
 265 #define _T_WCHAR_
 266 #define _T_WCHAR
 267 #define __WCHAR_T
 268 #define _WCHAR_T_
 269 #define _BSD_WCHAR_T_
 270 #define _WCHAR_T_DEFINED_
 271 #define _WCHAR_T_DEFINED
 272 #define _WCHAR_T_H
 273 #define ___int_wchar_t_h
 274 #define __INT_WCHAR_T_H
 275 #define _GCC_WCHAR_T
 276 #define _WCHAR_T_DECLARED
 277
 278 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
 279    instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other
 280    symbols in the _FOO_T_ family, stays defined even after its
 281    corresponding type is defined).  If we define wchar_t, then we
 282    must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if
 283    we undef _WCHAR_T_, then we must also define rune_t, since
 284    headers like runetype.h assume that if machine/ansi.h is included,
 285    and _BSD_WCHAR_T_ is not defined, then rune_t is available.
 286    machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of
 287    the same type." */
 288 #ifdef _BSD_WCHAR_T_
 289 #undef _BSD_WCHAR_T_
 290 #ifdef _BSD_RUNE_T_
 291 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 292 typedef _BSD_RUNE_T_ rune_t;
 293 #define _BSD_WCHAR_T_DEFINED_
 294 #define _BSD_RUNE_T_DEFINED_    /* Darwin */
 295 #if defined (__FreeBSD__) && (__FreeBSD__ < 5)
 296 /* Why is this file so hard to maintain properly?  In contrast to
 297    the comment above regarding BSD/386 1.1, on FreeBSD for as long
 298    as the symbol has existed, _BSD_RUNE_T_ must not stay defined or
 299    redundant typedefs will occur when stdlib.h is included after this file. */
 300 #undef _BSD_RUNE_T_
 301 #endif
 302 #endif
 303 #endif
 304 #endif
 305 /* FreeBSD 5 can't be handled well using "traditional" logic above
 306    since it no longer defines _BSD_RUNE_T_ yet still desires to export
 307    rune_t in some cases... */
 308 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
 309 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 310 #if __BSD_VISIBLE
 311 #ifndef _RUNE_T_DECLARED
 312 typedef __rune_t        rune_t;
 313 #define _RUNE_T_DECLARED
 314 #endif
 315 #endif
 316 #endif
 317 #endif
 318
 319 #ifndef __WCHAR_TYPE__
 320 #define __WCHAR_TYPE__ int
 321 #endif
 322 #ifndef __cplusplus
 323 typedef __WCHAR_TYPE__ wchar_t;
 324 #endif
 325 #endif
 326 #endif
 327 #endif
 328 #endif
 329 #endif
 330 #endif
 331 #endif /* _WCHAR_T_DECLARED */
 332 #endif /* _BSD_RUNE_T_DEFINED_ */
 333 #endif
 334 #endif
 335 #endif
 336 #endif
 337 #endif
 338 #endif
 339 #endif
 340 #endif /* __WCHAR_T__ */
 341 #endif /* __wchar_t__ */
 342 #undef  __need_wchar_t
 343 #endif /* _STDDEF_H or __need_wchar_t.  */
 344
 345 #if defined (__need_wint_t)
 346 #ifndef _WINT_T
 347 #define _WINT_T
 348
 349 #ifndef __WINT_TYPE__
 350 #define __WINT_TYPE__ unsigned int
 351 #endif
 352 typedef __WINT_TYPE__ wint_t;
 353 #endif
 354 #undef __need_wint_t
 355 #endif
 356
 357 /*  In 4.3bsd-net2, leave these undefined to indicate that size_t, etc.
 358     are already defined.  */
 359 /*  BSD/OS 3.1 and FreeBSD [23].x require the MACHINE_ANSI_H check here.  */
 360 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_)
 361 /*  The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_
 362     are probably typos and should be removed before 2.8 is released.  */
 363 #ifdef _GCC_PTRDIFF_T_
 364 #undef _PTRDIFF_T_
 365 #undef _BSD_PTRDIFF_T_
 366 #endif
 367 #ifdef _GCC_SIZE_T_
 368 #undef _SIZE_T_
 369 #undef _BSD_SIZE_T_
 370 #endif
 371 #ifdef _GCC_WCHAR_T_
 372 #undef _WCHAR_T_
 373 #undef _BSD_WCHAR_T_
 374 #endif
 375 /*  The following ones are the real ones.  */
 376 #ifdef _GCC_PTRDIFF_T
 377 #undef _PTRDIFF_T_
 378 #undef _BSD_PTRDIFF_T_
 379 #endif
 380 #ifdef _GCC_SIZE_T
 381 #undef _SIZE_T_
 382 #undef _BSD_SIZE_T_
 383 #endif
 384 #ifdef _GCC_WCHAR_T
 385 #undef _WCHAR_T_
 386 #undef _BSD_WCHAR_T_
 387 #endif
 388 #endif /* _ANSI_H_ || _MACHINE_ANSI_H_ */
 389
 390 #endif /* __sys_stdtypes_h */
 391
 392 /* A null pointer constant.  */
 393
 394 #if defined (_STDDEF_H) || defined (__need_NULL)
 395 #undef NULL             /* in case <stdio.h> has defined it. */
 396 #ifdef __GNUG__
 397 #define NULL __null
 398 #else   /* G++ */
 399 #ifndef __cplusplus
 400 #define NULL ((void *)0)
 401 #else   /* C++ */
 402 #define NULL 0
 403 #endif  /* C++ */
 404 #endif  /* G++ */
 405 #endif  /* NULL not defined and <stddef.h> or need NULL.  */
 406 #undef  __need_NULL
 407
 408 #ifdef _STDDEF_H
 409
 410 /* Offset of member MEMBER in a struct of type TYPE. */
 411 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
 412
 413 #endif /* _STDDEF_H was defined this time */
 414
 415 #endif /* !_STDDEF_H && !_STDDEF_H_ && !_ANSI_STDDEF_H && !__STDDEF_H__
 416           || __need_XXX was not defined before */