gnu/dist/gcc4/gcc/ginclude/stddef.h

   1 /* Copyright (C) 1989, 1997, 1998, 1999, 2000, 2002, 2004
   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 2, 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 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 /* As a special exception, if you include this header file into source
  22    files compiled by GCC, this header file does not by itself cause
  23    the resulting executable to be covered by the GNU General Public
  24    License.  This exception does not however invalidate any other
  25    reasons why the executable file might be covered by the GNU General
  26    Public License.  */
  27
  28 /*
  29  * ISO C Standard:  7.17  Common definitions  <stddef.h>
  30  */
  31 #if (!defined(_STDDEF_H) && !defined(_STDDEF_H_) && !defined(_ANSI_STDDEF_H) \
  32      && !defined(__STDDEF_H__)) \
  33     || defined(__need_wchar_t) || defined(__need_size_t) \
  34     || defined(__need_ptrdiff_t) || defined(__need_NULL) \
  35     || defined(__need_wint_t)
  36
  37 /* Any one of these symbols __need_* means that GNU libc
  38    wants us just to define one data type.  So don't define
  39    the symbols that indicate this file's entire job has been done.  */
  40 #if (!defined(__need_wchar_t) && !defined(__need_size_t)        \
  41      && !defined(__need_ptrdiff_t) && !defined(__need_NULL)     \
  42      && !defined(__need_wint_t))
  43 #define _STDDEF_H
  44 #define _STDDEF_H_
  45 /* snaroff@next.com says the NeXT needs this.  */
  46 #define _ANSI_STDDEF_H
  47 /* Irix 5.1 needs this.  */
  48 #define __STDDEF_H__
  49 #endif
  50
  51 #ifndef __sys_stdtypes_h
  52 /* This avoids lossage on SunOS but only if stdtypes.h comes first.
  53    There's no way to win with the other order!  Sun lossage.  */
  54
  55 /* On 4.3bsd-net2, make sure ansi.h is included, so we have
  56    one less case to deal with in the following.  */
  57 #if defined (__BSD_NET2__) || defined (____386BSD____) || (defined (__FreeBSD__) && (__FreeBSD__ < 5)) || defined(__NetBSD__)
  58 #ifndef inhibit_libc
  59 #include <machine/ansi.h>
  60 #endif
  61 #endif
  62 /* On FreeBSD 5, machine/ansi.h does not exist anymore... */
  63 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
  64 #include <sys/_types.h>
  65 #endif
  66
  67 /* In 4.3bsd-net2, machine/ansi.h defines these symbols, which are
  68    defined if the corresponding type is *not* defined.
  69    FreeBSD-2.1 defines _MACHINE_ANSI_H_ instead of _ANSI_H_ */
  70 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_)
  71 #if !defined(_SIZE_T_) && !defined(_BSD_SIZE_T_)
  72 #define _SIZE_T
  73 #endif
  74 #if !defined(_PTRDIFF_T_) && !defined(_BSD_PTRDIFF_T_)
  75 #define _PTRDIFF_T
  76 #endif
  77 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
  78    instead of _WCHAR_T_. */
  79 #if !defined(_WCHAR_T_) && !defined(_BSD_WCHAR_T_)
  80 #ifndef _BSD_WCHAR_T_
  81 #define _WCHAR_T
  82 #endif
  83 #endif
  84 /* Undef _FOO_T_ if we are supposed to define foo_t.  */
  85 #if defined (__need_ptrdiff_t) || defined (_STDDEF_H_)
  86 #undef _PTRDIFF_T_
  87 #undef _BSD_PTRDIFF_T_
  88 #endif
  89 #if defined (__need_size_t) || defined (_STDDEF_H_)
  90 #undef _SIZE_T_
  91 #undef _BSD_SIZE_T_
  92 #endif
  93 #if defined (__need_wchar_t) || defined (_STDDEF_H_)
  94 #undef _WCHAR_T_
  95 #undef _BSD_WCHAR_T_
  96 #endif
  97 #endif /* defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) */
  98
  99 /* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
 100    Just ignore it.  */
 101 #if defined (__sequent__) && defined (_PTRDIFF_T_)
 102 #undef _PTRDIFF_T_
 103 #endif
 104
 105 /* On VxWorks, <type/vxTypesBase.h> may have defined macros like
 106    _TYPE_size_t which will typedef size_t.  fixincludes patched the
 107    vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
 108    not defined, and so that defining this macro defines _GCC_SIZE_T.
 109    If we find that the macros are still defined at this point, we must
 110    invoke them so that the type is defined as expected.  */
 111 #if defined (_TYPE_ptrdiff_t) && (defined (__need_ptrdiff_t) || defined (_STDDEF_H_))
 112 _TYPE_ptrdiff_t;
 113 #undef _TYPE_ptrdiff_t
 114 #endif
 115 #if defined (_TYPE_size_t) && (defined (__need_size_t) || defined (_STDDEF_H_))
 116 _TYPE_size_t;
 117 #undef _TYPE_size_t
 118 #endif
 119 #if defined (_TYPE_wchar_t) && (defined (__need_wchar_t) || defined (_STDDEF_H_))
 120 _TYPE_wchar_t;
 121 #undef _TYPE_wchar_t
 122 #endif
 123
 124 /* In case nobody has defined these types, but we aren't running under
 125    GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
 126    __WCHAR_TYPE__ have reasonable values.  This can happen if the
 127    parts of GCC is compiled by an older compiler, that actually
 128    include gstddef.h, such as collect2.  */
 129
 130 /* Signed type of difference of two pointers.  */
 131
 132 /* Define this type if we are doing the whole job,
 133    or if we want this type in particular.  */
 134 #if defined (_STDDEF_H) || defined (__need_ptrdiff_t)
 135 #ifndef _PTRDIFF_T      /* in case <sys/types.h> has defined it. */
 136 #ifndef _T_PTRDIFF_
 137 #ifndef _T_PTRDIFF
 138 #ifndef __PTRDIFF_T
 139 #ifndef _PTRDIFF_T_
 140 #ifndef _BSD_PTRDIFF_T_
 141 #ifndef ___int_ptrdiff_t_h
 142 #ifndef _GCC_PTRDIFF_T
 143 #define _PTRDIFF_T
 144 #define _T_PTRDIFF_
 145 #define _T_PTRDIFF
 146 #define __PTRDIFF_T
 147 #define _PTRDIFF_T_
 148 #define _BSD_PTRDIFF_T_
 149 #define ___int_ptrdiff_t_h
 150 #define _GCC_PTRDIFF_T
 151 #ifndef __PTRDIFF_TYPE__
 152 #define __PTRDIFF_TYPE__ long int
 153 #endif
 154 typedef __PTRDIFF_TYPE__ ptrdiff_t;
 155 #endif /* _GCC_PTRDIFF_T */
 156 #endif /* ___int_ptrdiff_t_h */
 157 #endif /* _BSD_PTRDIFF_T_ */
 158 #endif /* _PTRDIFF_T_ */
 159 #endif /* __PTRDIFF_T */
 160 #endif /* _T_PTRDIFF */
 161 #endif /* _T_PTRDIFF_ */
 162 #endif /* _PTRDIFF_T */
 163
 164 /* If this symbol has done its job, get rid of it.  */
 165 #undef  __need_ptrdiff_t
 166
 167 #endif /* _STDDEF_H or __need_ptrdiff_t.  */
 168
 169 /* Unsigned type of `sizeof' something.  */
 170
 171 /* Define this type if we are doing the whole job,
 172    or if we want this type in particular.  */
 173 #if defined (_STDDEF_H) || defined (__need_size_t)
 174 #ifndef __size_t__      /* BeOS */
 175 #ifndef __SIZE_T__      /* Cray Unicos/Mk */
 176 #ifndef _SIZE_T /* in case <sys/types.h> has defined it. */
 177 #ifndef _SYS_SIZE_T_H
 178 #ifndef _T_SIZE_
 179 #ifndef _T_SIZE
 180 #ifndef __SIZE_T
 181 #ifndef _SIZE_T_
 182 #ifndef _BSD_SIZE_T_
 183 #ifndef _SIZE_T_DEFINED_
 184 #ifndef _SIZE_T_DEFINED
 185 #ifndef _BSD_SIZE_T_DEFINED_    /* Darwin */
 186 #ifndef _SIZE_T_DECLARED        /* FreeBSD 5 */
 187 #ifndef ___int_size_t_h
 188 #ifndef _GCC_SIZE_T
 189 #ifndef _SIZET_
 190 #ifndef __size_t
 191 #define __size_t__      /* BeOS */
 192 #define __SIZE_T__      /* Cray Unicos/Mk */
 193 #define _SIZE_T
 194 #define _SYS_SIZE_T_H
 195 #define _T_SIZE_
 196 #define _T_SIZE
 197 #define __SIZE_T
 198 #define _SIZE_T_
 199 #define _BSD_SIZE_T_
 200 #define _SIZE_T_DEFINED_
 201 #define _SIZE_T_DEFINED
 202 #define _BSD_SIZE_T_DEFINED_    /* Darwin */
 203 #define _SIZE_T_DECLARED        /* FreeBSD 5 */
 204 #define ___int_size_t_h
 205 #define _GCC_SIZE_T
 206 #define _SIZET_
 207 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
 208 /* __size_t is a typedef on FreeBSD 5!, must not trash it. */
 209 #else
 210 #define __size_t
 211 #endif
 212 #ifndef __SIZE_TYPE__
 213 #define __SIZE_TYPE__ long unsigned int
 214 #endif
 215 #if !(defined (__GNUG__) && defined (size_t))
 216 typedef __SIZE_TYPE__ size_t;
 217 #ifdef __BEOS__
 218 typedef long ssize_t;
 219 #endif /* __BEOS__ */
 220 #endif /* !(defined (__GNUG__) && defined (size_t)) */
 221 #endif /* __size_t */
 222 #endif /* _SIZET_ */
 223 #endif /* _GCC_SIZE_T */
 224 #endif /* ___int_size_t_h */
 225 #endif /* _SIZE_T_DECLARED */
 226 #endif /* _BSD_SIZE_T_DEFINED_ */
 227 #endif /* _SIZE_T_DEFINED */
 228 #endif /* _SIZE_T_DEFINED_ */
 229 #endif /* _BSD_SIZE_T_ */
 230 #endif /* _SIZE_T_ */
 231 #endif /* __SIZE_T */
 232 #endif /* _T_SIZE */
 233 #endif /* _T_SIZE_ */
 234 #endif /* _SYS_SIZE_T_H */
 235 #endif /* _SIZE_T */
 236 #endif /* __SIZE_T__ */
 237 #endif /* __size_t__ */
 238 #undef  __need_size_t
 239 #endif /* _STDDEF_H or __need_size_t.  */
 240
 241
 242 /* Wide character type.
 243    Locale-writers should change this as necessary to
 244    be big enough to hold unique values not between 0 and 127,
 245    and not (wchar_t) -1, for each defined multibyte character.  */
 246
 247 /* Define this type if we are doing the whole job,
 248    or if we want this type in particular.  */
 249 #if defined (_STDDEF_H) || defined (__need_wchar_t)
 250 #ifndef __wchar_t__     /* BeOS */
 251 #ifndef __WCHAR_T__     /* Cray Unicos/Mk */
 252 #ifndef _WCHAR_T
 253 #ifndef _T_WCHAR_
 254 #ifndef _T_WCHAR
 255 #ifndef __WCHAR_T
 256 #ifndef _WCHAR_T_
 257 #ifndef _BSD_WCHAR_T_
 258 #ifndef _BSD_WCHAR_T_DEFINED_    /* Darwin */
 259 #ifndef _BSD_RUNE_T_DEFINED_    /* Darwin */
 260 #ifndef _WCHAR_T_DECLARED /* FreeBSD 5 */
 261 #ifndef _WCHAR_T_DEFINED_
 262 #ifndef _WCHAR_T_DEFINED
 263 #ifndef _WCHAR_T_H
 264 #ifndef ___int_wchar_t_h
 265 #ifndef __INT_WCHAR_T_H
 266 #ifndef _GCC_WCHAR_T
 267 #define __wchar_t__     /* BeOS */
 268 #define __WCHAR_T__     /* Cray Unicos/Mk */
 269 #define _WCHAR_T
 270 #define _T_WCHAR_
 271 #define _T_WCHAR
 272 #define __WCHAR_T
 273 #define _WCHAR_T_
 274 #define _BSD_WCHAR_T_
 275 #define _WCHAR_T_DEFINED_
 276 #define _WCHAR_T_DEFINED
 277 #define _WCHAR_T_H
 278 #define ___int_wchar_t_h
 279 #define __INT_WCHAR_T_H
 280 #define _GCC_WCHAR_T
 281 #define _WCHAR_T_DECLARED
 282
 283 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
 284    instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other
 285    symbols in the _FOO_T_ family, stays defined even after its
 286    corresponding type is defined).  If we define wchar_t, then we
 287    must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if
 288    we undef _WCHAR_T_, then we must also define rune_t, since
 289    headers like runetype.h assume that if machine/ansi.h is included,
 290    and _BSD_WCHAR_T_ is not defined, then rune_t is available.
 291    machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of
 292    the same type." */
 293 #ifdef _BSD_WCHAR_T_
 294 #undef _BSD_WCHAR_T_
 295 #ifdef _BSD_RUNE_T_
 296 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 297 typedef _BSD_RUNE_T_ rune_t;
 298 #define _BSD_WCHAR_T_DEFINED_
 299 #define _BSD_RUNE_T_DEFINED_    /* Darwin */
 300 #if defined (__FreeBSD__) && (__FreeBSD__ < 5)
 301 /* Why is this file so hard to maintain properly?  In contrast to
 302    the comment above regarding BSD/386 1.1, on FreeBSD for as long
 303    as the symbol has existed, _BSD_RUNE_T_ must not stay defined or
 304    redundant typedefs will occur when stdlib.h is included after this file. */
 305 #undef _BSD_RUNE_T_
 306 #endif
 307 #endif
 308 #endif
 309 #endif
 310 /* FreeBSD 5 can't be handled well using "traditional" logic above
 311    since it no longer defines _BSD_RUNE_T_ yet still desires to export
 312    rune_t in some cases... */
 313 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
 314 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 315 #if __BSD_VISIBLE
 316 #ifndef _RUNE_T_DECLARED
 317 typedef __rune_t        rune_t;
 318 #define _RUNE_T_DECLARED
 319 #endif
 320 #endif
 321 #endif
 322 #endif
 323
 324 #ifndef __WCHAR_TYPE__
 325 #define __WCHAR_TYPE__ int
 326 #endif
 327 #ifndef __cplusplus
 328 typedef __WCHAR_TYPE__ wchar_t;
 329 #endif
 330 #endif
 331 #endif
 332 #endif
 333 #endif
 334 #endif
 335 #endif
 336 #endif /* _WCHAR_T_DECLARED */
 337 #endif /* _BSD_RUNE_T_DEFINED_ */
 338 #endif
 339 #endif
 340 #endif
 341 #endif
 342 #endif
 343 #endif
 344 #endif
 345 #endif /* __WCHAR_T__ */
 346 #endif /* __wchar_t__ */
 347 #undef  __need_wchar_t
 348 #endif /* _STDDEF_H or __need_wchar_t.  */
 349
 350 #if defined (__need_wint_t)
 351 #ifndef _WINT_T
 352 #define _WINT_T
 353
 354 #ifndef __WINT_TYPE__
 355 #define __WINT_TYPE__ unsigned int
 356 #endif
 357 typedef __WINT_TYPE__ wint_t;
 358 #endif
 359 #undef __need_wint_t
 360 #endif
 361
 362 /*  In 4.3bsd-net2, leave these undefined to indicate that size_t, etc.
 363     are already defined.  */
 364 /*  BSD/OS 3.1 and FreeBSD [23].x require the MACHINE_ANSI_H check here.  */
 365 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_)
 366 /*  The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_
 367     are probably typos and should be removed before 2.8 is released.  */
 368 #ifdef _GCC_PTRDIFF_T_
 369 #undef _PTRDIFF_T_
 370 #undef _BSD_PTRDIFF_T_
 371 #endif
 372 #ifdef _GCC_SIZE_T_
 373 #undef _SIZE_T_
 374 #undef _BSD_SIZE_T_
 375 #endif
 376 #ifdef _GCC_WCHAR_T_
 377 #undef _WCHAR_T_
 378 #undef _BSD_WCHAR_T_
 379 #endif
 380 /*  The following ones are the real ones.  */
 381 #ifdef _GCC_PTRDIFF_T
 382 #undef _PTRDIFF_T_
 383 #undef _BSD_PTRDIFF_T_
 384 #endif
 385 #ifdef _GCC_SIZE_T
 386 #undef _SIZE_T_
 387 #undef _BSD_SIZE_T_
 388 #endif
 389 #ifdef _GCC_WCHAR_T
 390 #undef _WCHAR_T_
 391 #undef _BSD_WCHAR_T_
 392 #endif
 393 #endif /* _ANSI_H_ || _MACHINE_ANSI_H_ */
 394
 395 #endif /* __sys_stdtypes_h */
 396
 397 /* A null pointer constant.  */
 398
 399 #if defined (_STDDEF_H) || defined (__need_NULL)
 400 #undef NULL             /* in case <stdio.h> has defined it. */
 401 #ifdef __GNUG__
 402 #define NULL __null
 403 #else   /* G++ */
 404 #ifndef __cplusplus
 405 #define NULL ((void *)0)
 406 #else   /* C++ */
 407 #define NULL 0
 408 #endif  /* C++ */
 409 #endif  /* G++ */
 410 #endif  /* NULL not defined and <stddef.h> or need NULL.  */
 411 #undef  __need_NULL
 412
 413 #ifdef _STDDEF_H
 414
 415 /* Offset of member MEMBER in a struct of type TYPE. */
 416 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
 417
 418 #endif /* _STDDEF_H was defined this time */
 419
 420 #endif /* !_STDDEF_H && !_STDDEF_H_ && !_ANSI_STDDEF_H && !__STDDEF_H__
 421           || __need_XXX was not defined before */