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  implement malloc case for realpath
  use __builtin_mul_overflow in calloc if gcc is recent enough

#ifndef _STDDEF_H
#define _STDDEF_H

#include <sys/cdefs.h>

__BEGIN_DECLS

/* ugh.  This is normally provided by gcc. */

#ifdef __GNUC__
typedef __PTRDIFF_TYPE__ ptrdiff_t;
typedef __SIZE_TYPE__ size_t;
#if !defined(__cplusplus)
typedef __WCHAR_TYPE__ wchar_t;
#endif
#else
typedef signed long ptrdiff_t;
typedef unsigned long size_t;
typedef int wchar_t;
#endif

#undef NULL
#if defined(__cplusplus)
#define NULL 0
#else
#define NULL (void*)0
#endif

#undef offsetof
#if defined(__GNUC__) && (__GNUC >= 3)
#define offsetof(type,member) __builtin_offsetof(type,member)
#else
#define offsetof(type,member) ((size_t) &((type*)0)->member)
#endif

__END_DECLS

#endif