include/stddef.h

   1 #ifndef _STDDEF_H
   2 #define _STDDEF_H
   3
   4 typedef __SIZE_TYPE__ size_t;
   5 typedef __PTRDIFF_TYPE__ ssize_t;
   6 typedef __WCHAR_TYPE__ wchar_t;
   7 typedef __PTRDIFF_TYPE__ ptrdiff_t;
   8 typedef __PTRDIFF_TYPE__ intptr_t;
   9 typedef __SIZE_TYPE__ uintptr_t;
  10
  11 #if __STDC_VERSION__ >= 201112L
  12 typedef union { long long __ll; long double __ld; } max_align_t;
  13 #endif
  14
  15 #ifndef NULL
  16 #define NULL ((void*)0)
  17 #endif
  18
  19 #undef offsetof
  20 #define offsetof(type, field) ((size_t)&((type *)0)->field)
  21
  22 #if defined __i386__ || defined __x86_64__
  23 void *alloca(size_t size);
  24 #endif
  25
  26 #endif
  27
  28 /* Older glibc require a wint_t from <stddef.h> (when requested
  29    by __need_wint_t, as otherwise stddef.h isn't allowed to
  30    define this type).   Note that this must be outside the normal
  31    _STDDEF_H guard, so that it works even when we've included the file
  32    already (without requiring wint_t).  Some other libs define _WINT_T
  33    if they've already provided that type, so we can use that as guard.
  34    TCC defines __WINT_TYPE__ for us.  */
  35 #if defined (__need_wint_t)
  36 #ifndef _WINT_T
  37 #define _WINT_T
  38 typedef __WINT_TYPE__ wint_t;
  39 #endif
  40 #undef __need_wint_t
  41 #endif