gcc/ginclude/stddef.h

   1 /* Copyright (C) 1989, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   2
   3 This file is part of GNU CC.
   4
   5 GNU CC 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 GNU CC 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 GNU CC; 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__) || defined(__NetBSD__)
  57 #include <machine/ansi.h>
  58 #endif
  59
  60 /* In 4.3bsd-net2, machine/ansi.h defines these symbols, which are
  61    defined if the corresponding type is *not* defined.
  62    FreeBSD-2.1 defines _MACHINE_ANSI_H_ instead of _ANSI_H_ */
  63 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_)
  64 #if !defined(_SIZE_T_) && !defined(_BSD_SIZE_T_)
  65 #define _SIZE_T
  66 #endif
  67 #if !defined(_PTRDIFF_T_) && !defined(_BSD_PTRDIFF_T_)
  68 #define _PTRDIFF_T
  69 #endif
  70 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
  71    instead of _WCHAR_T_. */
  72 #if !defined(_WCHAR_T_) && !defined(_BSD_WCHAR_T_)
  73 #ifndef _BSD_WCHAR_T_
  74 #define _WCHAR_T
  75 #endif
  76 #endif
  77 /* Undef _FOO_T_ if we are supposed to define foo_t.  */
  78 #if defined (__need_ptrdiff_t) || defined (_STDDEF_H_)
  79 #undef _PTRDIFF_T_
  80 #undef _BSD_PTRDIFF_T_
  81 #endif
  82 #if defined (__need_size_t) || defined (_STDDEF_H_)
  83 #undef _SIZE_T_
  84 #undef _BSD_SIZE_T_
  85 #endif
  86 #if defined (__need_wchar_t) || defined (_STDDEF_H_)
  87 #undef _WCHAR_T_
  88 #undef _BSD_WCHAR_T_
  89 #endif
  90 #endif /* defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) */
  91
  92 /* Sequent's header files use _PTRDIFF_T_ in some conflicting way.
  93    Just ignore it.  */
  94 #if defined (__sequent__) && defined (_PTRDIFF_T_)
  95 #undef _PTRDIFF_T_
  96 #endif
  97
  98 /* On VxWorks, <type/vxTypesBase.h> may have defined macros like
  99    _TYPE_size_t which will typedef size_t.  fixincludes patched the
 100    vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is
 101    not defined, and so that defining this macro defines _GCC_SIZE_T.
 102    If we find that the macros are still defined at this point, we must
 103    invoke them so that the type is defined as expected.  */
 104 #if defined (_TYPE_ptrdiff_t) && (defined (__need_ptrdiff_t) || defined (_STDDEF_H_))
 105 _TYPE_ptrdiff_t;
 106 #undef _TYPE_ptrdiff_t
 107 #endif
 108 #if defined (_TYPE_size_t) && (defined (__need_size_t) || defined (_STDDEF_H_))
 109 _TYPE_size_t;
 110 #undef _TYPE_size_t
 111 #endif
 112 #if defined (_TYPE_wchar_t) && (defined (__need_wchar_t) || defined (_STDDEF_H_))
 113 _TYPE_wchar_t;
 114 #undef _TYPE_wchar_t
 115 #endif
 116
 117 /* In case nobody has defined these types, but we aren't running under
 118    GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and
 119    __WCHAR_TYPE__ have reasonable values.  This can happen if the
 120    parts of GCC is compiled by an older compiler, that actually
 121    include gstddef.h, such as collect2.  */
 122
 123 /* Signed type of difference of two pointers.  */
 124
 125 /* Define this type if we are doing the whole job,
 126    or if we want this type in particular.  */
 127 #if defined (_STDDEF_H) || defined (__need_ptrdiff_t)
 128 #ifndef _PTRDIFF_T      /* in case <sys/types.h> has defined it. */
 129 #ifndef _T_PTRDIFF_
 130 #ifndef _T_PTRDIFF
 131 #ifndef __PTRDIFF_T
 132 #ifndef _PTRDIFF_T_
 133 #ifndef _BSD_PTRDIFF_T_
 134 #ifndef ___int_ptrdiff_t_h
 135 #ifndef _GCC_PTRDIFF_T
 136 #define _PTRDIFF_T
 137 #define _T_PTRDIFF_
 138 #define _T_PTRDIFF
 139 #define __PTRDIFF_T
 140 #define _PTRDIFF_T_
 141 #define _BSD_PTRDIFF_T_
 142 #define ___int_ptrdiff_t_h
 143 #define _GCC_PTRDIFF_T
 144 #ifndef __PTRDIFF_TYPE__
 145 #define __PTRDIFF_TYPE__ long int
 146 #endif
 147 typedef __PTRDIFF_TYPE__ ptrdiff_t;
 148 #endif /* _GCC_PTRDIFF_T */
 149 #endif /* ___int_ptrdiff_t_h */
 150 #endif /* _BSD_PTRDIFF_T_ */
 151 #endif /* _PTRDIFF_T_ */
 152 #endif /* __PTRDIFF_T */
 153 #endif /* _T_PTRDIFF */
 154 #endif /* _T_PTRDIFF_ */
 155 #endif /* _PTRDIFF_T */
 156
 157 /* If this symbol has done its job, get rid of it.  */
 158 #undef  __need_ptrdiff_t
 159
 160 #endif /* _STDDEF_H or __need_ptrdiff_t.  */
 161
 162 /* Unsigned type of `sizeof' something.  */
 163
 164 /* Define this type if we are doing the whole job,
 165    or if we want this type in particular.  */
 166 #if defined (_STDDEF_H) || defined (__need_size_t)
 167 #ifndef __size_t__      /* BeOS */
 168 #ifndef __SIZE_T__      /* Cray Unicos/Mk */
 169 #ifndef _SIZE_T /* in case <sys/types.h> has defined it. */
 170 #ifndef _SYS_SIZE_T_H
 171 #ifndef _T_SIZE_
 172 #ifndef _T_SIZE
 173 #ifndef __SIZE_T
 174 #ifndef _SIZE_T_
 175 #ifndef _BSD_SIZE_T_
 176 #ifndef _SIZE_T_DEFINED_
 177 #ifndef _SIZE_T_DEFINED
 178 #ifndef ___int_size_t_h
 179 #ifndef _GCC_SIZE_T
 180 #ifndef _SIZET_
 181 #ifndef __size_t
 182 #define __size_t__      /* BeOS */
 183 #define __SIZE_T__      /* Cray Unicos/Mk */
 184 #define _SIZE_T
 185 #define _SYS_SIZE_T_H
 186 #define _T_SIZE_
 187 #define _T_SIZE
 188 #define __SIZE_T
 189 #define _SIZE_T_
 190 #define _BSD_SIZE_T_
 191 #define _SIZE_T_DEFINED_
 192 #define _SIZE_T_DEFINED
 193 #define ___int_size_t_h
 194 #define _GCC_SIZE_T
 195 #define _SIZET_
 196 #define __size_t
 197 #ifndef __SIZE_TYPE__
 198 #define __SIZE_TYPE__ long unsigned int
 199 #endif
 200 #if !(defined (__GNUG__) && defined (size_t))
 201 typedef __SIZE_TYPE__ size_t;
 202 #ifdef __BEOS__
 203 typedef long ssize_t;
 204 #endif /* __BEOS__ */
 205 #endif /* !(defined (__GNUG__) && defined (size_t)) */
 206 #endif /* __size_t */
 207 #endif /* _SIZET_ */
 208 #endif /* _GCC_SIZE_T */
 209 #endif /* ___int_size_t_h */
 210 #endif /* _SIZE_T_DEFINED */
 211 #endif /* _SIZE_T_DEFINED_ */
 212 #endif /* _BSD_SIZE_T_ */
 213 #endif /* _SIZE_T_ */
 214 #endif /* __SIZE_T */
 215 #endif /* _T_SIZE */
 216 #endif /* _T_SIZE_ */
 217 #endif /* _SYS_SIZE_T_H */
 218 #endif /* _SIZE_T */
 219 #endif /* __SIZE_T__ */
 220 #endif /* __size_t__ */
 221 #undef  __need_size_t
 222 #endif /* _STDDEF_H or __need_size_t.  */
 223
 224
 225 /* Wide character type.
 226    Locale-writers should change this as necessary to
 227    be big enough to hold unique values not between 0 and 127,
 228    and not (wchar_t) -1, for each defined multibyte character.  */
 229
 230 /* Define this type if we are doing the whole job,
 231    or if we want this type in particular.  */
 232 #if defined (_STDDEF_H) || defined (__need_wchar_t)
 233 #ifndef __wchar_t__     /* BeOS */
 234 #ifndef __WCHAR_T__     /* Cray Unicos/Mk */
 235 #ifndef _WCHAR_T
 236 #ifndef _T_WCHAR_
 237 #ifndef _T_WCHAR
 238 #ifndef __WCHAR_T
 239 #ifndef _WCHAR_T_
 240 #ifndef _BSD_WCHAR_T_
 241 #ifndef _BSD_WCHAR_T_DEFINED_    /* Darwin */
 242 #ifndef _WCHAR_T_DEFINED_
 243 #ifndef _WCHAR_T_DEFINED
 244 #ifndef _WCHAR_T_H
 245 #ifndef ___int_wchar_t_h
 246 #ifndef __INT_WCHAR_T_H
 247 #ifndef _GCC_WCHAR_T
 248 #define __wchar_t__     /* BeOS */
 249 #define __WCHAR_T__     /* Cray Unicos/Mk */
 250 #define _WCHAR_T
 251 #define _T_WCHAR_
 252 #define _T_WCHAR
 253 #define __WCHAR_T
 254 #define _WCHAR_T_
 255 #define _BSD_WCHAR_T_
 256 #define _WCHAR_T_DEFINED_
 257 #define _WCHAR_T_DEFINED
 258 #define _WCHAR_T_H
 259 #define ___int_wchar_t_h
 260 #define __INT_WCHAR_T_H
 261 #define _GCC_WCHAR_T
 262
 263 /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_
 264    instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other
 265    symbols in the _FOO_T_ family, stays defined even after its
 266    corresponding type is defined).  If we define wchar_t, then we
 267    must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if
 268    we undef _WCHAR_T_, then we must also define rune_t, since
 269    headers like runetype.h assume that if machine/ansi.h is included,
 270    and _BSD_WCHAR_T_ is not defined, then rune_t is available.
 271    machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of
 272    the same type." */
 273 #ifdef _BSD_WCHAR_T_
 274 #undef _BSD_WCHAR_T_
 275 #ifdef _BSD_RUNE_T_
 276 #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE)
 277 typedef _BSD_RUNE_T_ rune_t;
 278 #define _BSD_WCHAR_T_DEFINED_
 279 #if defined (__FreeBSD__)
 280 /* Why is this file so hard to maintain properly?  In constrast to
 281    the comment above regarding BSD/386 1.1, on FreeBSD for as long
 282    as the symbol has existed, _BSD_RUNE_T_ must not stay defined or
 283    redundant typedefs will occur when stdlib.h is included after this file. */
 284 #undef _BSD_RUNE_T_
 285 #endif
 286 #endif
 287 #endif
 288 #endif
 289
 290 #ifndef __WCHAR_TYPE__
 291 #define __WCHAR_TYPE__ int
 292 #endif
 293 #ifndef __cplusplus
 294 typedef __WCHAR_TYPE__ wchar_t;
 295 #endif
 296 #endif
 297 #endif
 298 #endif
 299 #endif
 300 #endif
 301 #endif
 302 #endif
 303 #endif
 304 #endif
 305 #endif
 306 #endif
 307 #endif
 308 #endif
 309 #endif /* __WCHAR_T__ */
 310 #endif /* __wchar_t__ */
 311 #undef  __need_wchar_t
 312 #endif /* _STDDEF_H or __need_wchar_t.  */
 313
 314 #if defined (__need_wint_t)
 315 #ifndef _WINT_T
 316 #define _WINT_T
 317
 318 #ifndef __WINT_TYPE__
 319 #define __WINT_TYPE__ unsigned int
 320 #endif
 321 typedef __WINT_TYPE__ wint_t;
 322 #endif
 323 #undef __need_wint_t
 324 #endif
 325
 326 /*  In 4.3bsd-net2, leave these undefined to indicate that size_t, etc.
 327     are already defined.  */
 328 /*  BSD/OS 3.1 and FreeBSD [23].x require the MACHINE_ANSI_H check here.  */
 329 #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_)
 330 /*  The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_
 331     are probably typos and should be removed before 2.8 is released.  */
 332 #ifdef _GCC_PTRDIFF_T_
 333 #undef _PTRDIFF_T_
 334 #undef _BSD_PTRDIFF_T_
 335 #endif
 336 #ifdef _GCC_SIZE_T_
 337 #undef _SIZE_T_
 338 #undef _BSD_SIZE_T_
 339 #endif
 340 #ifdef _GCC_WCHAR_T_
 341 #undef _WCHAR_T_
 342 #undef _BSD_WCHAR_T_
 343 #endif
 344 /*  The following ones are the real ones.  */
 345 #ifdef _GCC_PTRDIFF_T
 346 #undef _PTRDIFF_T_
 347 #undef _BSD_PTRDIFF_T_
 348 #endif
 349 #ifdef _GCC_SIZE_T
 350 #undef _SIZE_T_
 351 #undef _BSD_SIZE_T_
 352 #endif
 353 #ifdef _GCC_WCHAR_T
 354 #undef _WCHAR_T_
 355 #undef _BSD_WCHAR_T_
 356 #endif
 357 #endif /* _ANSI_H_ || _MACHINE_ANSI_H_ */
 358
 359 #endif /* __sys_stdtypes_h */
 360
 361 /* A null pointer constant.  */
 362
 363 #if defined (_STDDEF_H) || defined (__need_NULL)
 364 #undef NULL             /* in case <stdio.h> has defined it. */
 365 #ifdef __GNUG__
 366 #define NULL __null
 367 #else   /* G++ */
 368 #ifndef __cplusplus
 369 #define NULL ((void *)0)
 370 #else   /* C++ */
 371 #define NULL 0
 372 #endif  /* C++ */
 373 #endif  /* G++ */
 374 #endif  /* NULL not defined and <stddef.h> or need NULL.  */
 375 #undef  __need_NULL
 376
 377 #ifdef _STDDEF_H
 378
 379 /* Offset of member MEMBER in a struct of type TYPE.  */
 380
 381 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 382
 383 #endif /* _STDDEF_H was defined this time */
 384
 385 #endif /* !_STDDEF_H && !_STDDEF_H_ && !_ANSI_STDDEF_H && !__STDDEF_H__
 386           || __need_XXX was not defined before */