gcc/ginclude/stddef.h

   1 /* Copyright (C) 1989, 1997, 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
   2
   3 This file is part of GCC.
   4
   5 GCC 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 2, or (at your option)
   8 any later version.
   9
  10 GCC 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 GCC; see the file COPYING.  If not, write to
  17 the Free Software Foundation, 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 /* As a special exception, if you include this header file into source
  21    files compiled by GCC, this header file does not by itself cause
  22    the resulting executable to be covered by the GNU General Public
  23    License.  This exception does not however invalidate any other
  24    reasons why the executable file might be covered by the GNU General
  25    Public License.  */
  26
  27 /*
  28  * ISO C Standard:  7.17  Common definitions  <stddef.h>
  29  */
  30 #if (!defined(_STDDEF_H) && !defined(_STDDEF_H_) && !defined(_ANSI_STDDEF_H) \
  31      && !defined(__STDDEF_H__)) \
  32     || defined(__need_wchar_t) || defined(__need_size_t) \
  33     || defined(__need_ptrdiff_t) || defined(__need_NULL) \
  34     || defined(__need_wint_t)
  35
  36 /* Any one of these symbols __need_* means that GNU libc
  37    wants us just to define one data type.  So don't define
  38    the symbols that indicate this file's entire job has been done.  */
  39 #if (!defined(__need_wchar_t) && !defined(__need_size_t)        \
  40      && !defined(__need_ptrdiff_t) && !defined(__need_NULL)     \
  41      && !defined(__need_wint_t))
  42 #define _STDDEF_H
  43 #define _STDDEF_H_
  44 /* snaroff@next.com says the NeXT needs this.  */
  45 #define _ANSI_STDDEF_H
  46 /* Irix 5.1 needs this.  */
  47 #define __STDDEF_H__
  48 #endif
  49
  50 #ifndef __sys_stdtypes_h
  51 /* This avoids lossage on SunOS but only if stdtypes.h comes first.
  52    There's no way to win with the other order!  Sun lossage.  */
  53
  54 /* On 4.3bsd-net2, make sure ansi.h is included, so we have
  55    one less case to deal with in the following.  */
  56 #if defined (__BSD_NET2__) || defined (____386BSD____) || (defined (__FreeBSD__) && (__FreeBSD__ < 5)) || defined(__NetBSD__)
  57 #include <machine/ansi.h>
  58 #endif
  59 /* On FreeBSD 5, machine/ansi.h does not exist anymore... */
  60 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
  61 #include <sys/_types.h>
  62 #endif
  63
  64 /* In 4.3bsd-net2, machine/ansi.h defines these symbols, which are
  65    defined if the corresponding type is *not* defined.
  66    FreeBSD-2.1 defines _MACHINE_ANSI_H_ instead of _ANSI_H_ */
  67 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_)
  68 #if !defined(_SIZE_T_) && !defined(_BSD_SIZE_T_)
  69 #define _SIZE_T
  70 #endif
  71 #if !defined(_PTRDIFF_T_) && !defined(_BSD_PTRDIFF_T_)
  72 #define _PTRDIFF_T
  73 #endif
  74 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
  75    instead of _WCHAR_T_. */
  76 #if !defined(_WCHAR_T_) && !defined(_BSD_WCHAR_T_)
  77 #ifndef _BSD_WCHAR_T_
  78 #define _WCHAR_T
  79 #endif
  80 #endif
  81 /* Undef _FOO_T_ if we are supposed to define foo_t.  */
  82 #if defined (__need_ptrdiff_t) || defined (_STDDEF_H_)
  83 #undef _PTRDIFF_T_
  84 #undef _BSD_PTRDIFF_T_
  85 #endif
  86 #if defined (__need_size_t) || defined (_STDDEF_H_)
  87 #undef _SIZE_T_
  88 #undef _BSD_SIZE_T_
  89 #endif
  90 #if defined (__need_wchar_t) || defined (_STDDEF_H_)
  91 #undef _WCHAR_T_
  92 #undef _BSD_WCHAR_T_
  93 #endif
  94 #endif /* defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) */
  95
  96 /* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
  97    Just ignore it.  */
  98 #if defined (__sequent__) && defined (_PTRDIFF_T_)
  99 #undef _PTRDIFF_T_
 100 #endif
 101
 102 /* On VxWorks, <type/vxTypesBase.h> may have defined macros like
 103    _TYPE_size_t which will typedef size_t.  fixincludes patched the
 104    vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
 105    not defined, and so that defining this macro defines _GCC_SIZE_T.
 106    If we find that the macros are still defined at this point, we must
 107    invoke them so that the type is defined as expected.  */
 108 #if defined (_TYPE_ptrdiff_t) && (defined (__need_ptrdiff_t) || defined (_STDDEF_H_))
 109 _TYPE_ptrdiff_t;
 110 #undef _TYPE_ptrdiff_t
 111 #endif
 112 #if defined (_TYPE_size_t) && (defined (__need_size_t) || defined (_STDDEF_H_))
 113 _TYPE_size_t;
 114 #undef _TYPE_size_t
 115 #endif
 116 #if defined (_TYPE_wchar_t) && (defined (__need_wchar_t) || defined (_STDDEF_H_))
 117 _TYPE_wchar_t;
 118 #undef _TYPE_wchar_t
 119 #endif
 120
 121 /* In case nobody has defined these types, but we aren't running under
 122    GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
 123    __WCHAR_TYPE__ have reasonable values.  This can happen if the
 124    parts of GCC is compiled by an older compiler, that actually
 125    include gstddef.h, such as collect2.  */
 126
 127 /* Signed type of difference of two pointers.  */
 128
 129 /* Define this type if we are doing the whole job,
 130    or if we want this type in particular.  */
 131 #if defined (_STDDEF_H) || defined (__need_ptrdiff_t)
 132 #ifndef _PTRDIFF_T      /* in case <sys/types.h> has defined it. */
 133 #ifndef _T_PTRDIFF_
 134 #ifndef _T_PTRDIFF
 135 #ifndef __PTRDIFF_T
 136 #ifndef _PTRDIFF_T_
 137 #ifndef _BSD_PTRDIFF_T_
 138 #ifndef ___int_ptrdiff_t_h
 139 #ifndef _GCC_PTRDIFF_T
 140 #define _PTRDIFF_T
 141 #define _T_PTRDIFF_
 142 #define _T_PTRDIFF
 143 #define __PTRDIFF_T
 144 #define _PTRDIFF_T_
 145 #define _BSD_PTRDIFF_T_
 146 #define ___int_ptrdiff_t_h
 147 #define _GCC_PTRDIFF_T
 148 #ifndef __PTRDIFF_TYPE__
 149 #define __PTRDIFF_TYPE__ long int
 150 #endif
 151 typedef __PTRDIFF_TYPE__ ptrdiff_t;
 152 #endif /* _GCC_PTRDIFF_T */
 153 #endif /* ___int_ptrdiff_t_h */
 154 #endif /* _BSD_PTRDIFF_T_ */
 155 #endif /* _PTRDIFF_T_ */
 156 #endif /* __PTRDIFF_T */
 157 #endif /* _T_PTRDIFF */
 158 #endif /* _T_PTRDIFF_ */
 159 #endif /* _PTRDIFF_T */
 160
 161 /* If this symbol has done its job, get rid of it.  */
 162 #undef  __need_ptrdiff_t
 163
 164 #endif /* _STDDEF_H or __need_ptrdiff_t.  */
 165
 166 /* Unsigned type of `sizeof' something.  */
 167
 168 /* Define this type if we are doing the whole job,
 169    or if we want this type in particular.  */
 170 #if defined (_STDDEF_H) || defined (__need_size_t)
 171 #ifndef __size_t__      /* BeOS */
 172 #ifndef __SIZE_T__      /* Cray Unicos/Mk */
 173 #ifndef _SIZE_T /* in case <sys/types.h> has defined it. */
 174 #ifndef _SYS_SIZE_T_H
 175 #ifndef _T_SIZE_
 176 #ifndef _T_SIZE
 177 #ifndef __SIZE_T
 178 #ifndef _SIZE_T_
 179 #ifndef _BSD_SIZE_T_
 180 #ifndef _SIZE_T_DEFINED_
 181 #ifndef _SIZE_T_DEFINED
 182 #ifndef _BSD_SIZE_T_DEFINED_    /* Darwin */
 183 #ifndef _SIZE_T_DECLARED        /* FreeBSD 5 */
 184 #ifndef ___int_size_t_h
 185 #ifndef _GCC_SIZE_T
 186 #ifndef _SIZET_
 187 #ifndef __size_t
 188 #define __size_t__      /* BeOS */
 189 #define __SIZE_T__      /* Cray Unicos/Mk */
 190 #define _SIZE_T
 191 #define _SYS_SIZE_T_H
 192 #define _T_SIZE_
 193 #define _T_SIZE
 194 #define __SIZE_T
 195 #define _SIZE_T_
 196 #define _BSD_SIZE_T_
 197 #define _SIZE_T_DEFINED_
 198 #define _SIZE_T_DEFINED
 199 #define _BSD_SIZE_T_DEFINED_    /* Darwin */
 200 #define _SIZE_T_DECLARED        /* FreeBSD 5 */
 201 #define ___int_size_t_h
 202 #define _GCC_SIZE_T
 203 #define _SIZET_
 204 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
 205 /* __size_t is a typedef on FreeBSD 5!, must not trash it. */
 206 #else
 207 #define __size_t
 208 #endif
 209 #ifndef __SIZE_TYPE__
 210 #define __SIZE_TYPE__ long unsigned int
 211 #endif
 212 #if !(defined (__GNUG__) && defined (size_t))
 213 typedef __SIZE_TYPE__ size_t;
 214 #ifdef __BEOS__
 215 typedef long ssize_t;
 216 #endif /* __BEOS__ */
 217 #endif /* !(defined (__GNUG__) && defined (size_t)) */
 218 #endif /* __size_t */
 219 #endif /* _SIZET_ */
 220 #endif /* _GCC_SIZE_T */
 221 #endif /* ___int_size_t_h */
 222 #endif /* _SIZE_T_DECLARED */
 223 #endif /* _BSD_SIZE_T_DEFINED_ */
 224 #endif /* _SIZE_T_DEFINED */
 225 #endif /* _SIZE_T_DEFINED_ */
 226 #endif /* _BSD_SIZE_T_ */
 227 #endif /* _SIZE_T_ */
 228 #endif /* __SIZE_T */
 229 #endif /* _T_SIZE */
 230 #endif /* _T_SIZE_ */
 231 #endif /* _SYS_SIZE_T_H */
 232 #endif /* _SIZE_T */
 233 #endif /* __SIZE_T__ */
 234 #endif /* __size_t__ */
 235 #undef  __need_size_t
 236 #endif /* _STDDEF_H or __need_size_t.  */
 237
 238
 239 /* Wide character type.
 240    Locale-writers should change this as necessary to
 241    be big enough to hold unique values not between 0 and 127,
 242    and not (wchar_t) -1, for each defined multibyte character.  */
 243
 244 /* Define this type if we are doing the whole job,
 245    or if we want this type in particular.  */
 246 #if defined (_STDDEF_H) || defined (__need_wchar_t)
 247 #ifndef __wchar_t__     /* BeOS */
 248 #ifndef __WCHAR_T__     /* Cray Unicos/Mk */
 249 #ifndef _WCHAR_T
 250 #ifndef _T_WCHAR_
 251 #ifndef _T_WCHAR
 252 #ifndef __WCHAR_T
 253 #ifndef _WCHAR_T_
 254 #ifndef _BSD_WCHAR_T_
 255 #ifndef _BSD_WCHAR_T_DEFINED_    /* Darwin */
 256 #ifndef _BSD_RUNE_T_DEFINED_    /* Darwin */
 257 #ifndef _WCHAR_T_DECLARED /* FreeBSD 5 */
 258 #ifndef _WCHAR_T_DEFINED_
 259 #ifndef _WCHAR_T_DEFINED
 260 #ifndef _WCHAR_T_H
 261 #ifndef ___int_wchar_t_h
 262 #ifndef __INT_WCHAR_T_H
 263 #ifndef _GCC_WCHAR_T
 264 #define __wchar_t__     /* BeOS */
 265 #define __WCHAR_T__     /* Cray Unicos/Mk */
 266 #define _WCHAR_T
 267 #define _T_WCHAR_
 268 #define _T_WCHAR
 269 #define __WCHAR_T
 270 #define _WCHAR_T_
 271 #define _BSD_WCHAR_T_
 272 #define _WCHAR_T_DEFINED_
 273 #define _WCHAR_T_DEFINED
 274 #define _WCHAR_T_H
 275 #define ___int_wchar_t_h
 276 #define __INT_WCHAR_T_H
 277 #define _GCC_WCHAR_T
 278 #define _WCHAR_T_DECLARED
 279
 280 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
 281    instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other
 282    symbols in the _FOO_T_ family, stays defined even after its
 283    corresponding type is defined).  If we define wchar_t, then we
 284    must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if
 285    we undef _WCHAR_T_, then we must also define rune_t, since
 286    headers like runetype.h assume that if machine/ansi.h is included,
 287    and _BSD_WCHAR_T_ is not defined, then rune_t is available.
 288    machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of
 289    the same type." */
 290 #ifdef _BSD_WCHAR_T_
 291 #undef _BSD_WCHAR_T_
 292 #ifdef _BSD_RUNE_T_
 293 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 294 typedef _BSD_RUNE_T_ rune_t;
 295 #define _BSD_WCHAR_T_DEFINED_
 296 #define _BSD_RUNE_T_DEFINED_    /* Darwin */
 297 #if defined (__FreeBSD__) && (__FreeBSD__ < 5)
 298 /* Why is this file so hard to maintain properly?  In constrast to
 299    the comment above regarding BSD/386 1.1, on FreeBSD for as long
 300    as the symbol has existed, _BSD_RUNE_T_ must not stay defined or
 301    redundant typedefs will occur when stdlib.h is included after this file. */
 302 #undef _BSD_RUNE_T_
 303 #endif
 304 #endif
 305 #endif
 306 #endif
 307 /* FreeBSD 5 can't be handled well using "traditional" logic above
 308    since it no longer defines _BSD_RUNE_T_ yet still desires to export
 309    rune_t in some cases... */
 310 #if defined (__FreeBSD__) && (__FreeBSD__ >= 5)
 311 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 312 #if __BSD_VISIBLE
 313 #ifndef _RUNE_T_DECLARED
 314 typedef __rune_t        rune_t;
 315 #define _RUNE_T_DECLARED
 316 #endif
 317 #endif
 318 #endif
 319 #endif
 320
 321 #ifndef __WCHAR_TYPE__
 322 #define __WCHAR_TYPE__ int
 323 #endif
 324 #ifndef __cplusplus
 325 typedef __WCHAR_TYPE__ wchar_t;
 326 #endif
 327 #endif
 328 #endif
 329 #endif
 330 #endif
 331 #endif
 332 #endif
 333 #endif /* _WCHAR_T_DECLARED */
 334 #endif /* _BSD_RUNE_T_DEFINED_ */
 335 #endif
 336 #endif
 337 #endif
 338 #endif
 339 #endif
 340 #endif
 341 #endif
 342 #endif /* __WCHAR_T__ */
 343 #endif /* __wchar_t__ */
 344 #undef  __need_wchar_t
 345 #endif /* _STDDEF_H or __need_wchar_t.  */
 346
 347 #if defined (__need_wint_t)
 348 #ifndef _WINT_T
 349 #define _WINT_T
 350
 351 #ifndef __WINT_TYPE__
 352 #define __WINT_TYPE__ unsigned int
 353 #endif
 354 typedef __WINT_TYPE__ wint_t;
 355 #endif
 356 #undef __need_wint_t
 357 #endif
 358
 359 /*  In 4.3bsd-net2, leave these undefined to indicate that size_t, etc.
 360     are already defined.  */
 361 /*  BSD/OS 3.1 and FreeBSD [23].x require the MACHINE_ANSI_H check here.  */
 362 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_)
 363 /*  The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_
 364     are probably typos and should be removed before 2.8 is released.  */
 365 #ifdef _GCC_PTRDIFF_T_
 366 #undef _PTRDIFF_T_
 367 #undef _BSD_PTRDIFF_T_
 368 #endif
 369 #ifdef _GCC_SIZE_T_
 370 #undef _SIZE_T_
 371 #undef _BSD_SIZE_T_
 372 #endif
 373 #ifdef _GCC_WCHAR_T_
 374 #undef _WCHAR_T_
 375 #undef _BSD_WCHAR_T_
 376 #endif
 377 /*  The following ones are the real ones.  */
 378 #ifdef _GCC_PTRDIFF_T
 379 #undef _PTRDIFF_T_
 380 #undef _BSD_PTRDIFF_T_
 381 #endif
 382 #ifdef _GCC_SIZE_T
 383 #undef _SIZE_T_
 384 #undef _BSD_SIZE_T_
 385 #endif
 386 #ifdef _GCC_WCHAR_T
 387 #undef _WCHAR_T_
 388 #undef _BSD_WCHAR_T_
 389 #endif
 390 #endif /* _ANSI_H_ || _MACHINE_ANSI_H_ */
 391
 392 #endif /* __sys_stdtypes_h */
 393
 394 /* A null pointer constant.  */
 395
 396 #if defined (_STDDEF_H) || defined (__need_NULL)
 397 #undef NULL             /* in case <stdio.h> has defined it. */
 398 #ifdef __GNUG__
 399 #define NULL __null
 400 #else   /* G++ */
 401 #ifndef __cplusplus
 402 #define NULL ((void *)0)
 403 #else   /* C++ */
 404 #define NULL 0
 405 #endif  /* C++ */
 406 #endif  /* G++ */
 407 #endif  /* NULL not defined and <stddef.h> or need NULL.  */
 408 #undef  __need_NULL
 409
 410 #ifdef _STDDEF_H
 411
 412 /* Offset of member MEMBER in a struct of type TYPE.  */
 413
 414 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 415
 416 #endif /* _STDDEF_H was defined this time */
 417
 418 #endif /* !_STDDEF_H && !_STDDEF_H_ && !_ANSI_STDDEF_H && !__STDDEF_H__
 419           || __need_XXX was not defined before */