musl/include/stddef.h
Rich Felker c8a9c22173 restore type of NULL to void * except when used in C++ programs
unfortunately this eliminates the ability of the compiler to diagnose
some dangerous/incorrect usage, but POSIX requires (as an extension to
the C language, i.e. CX shaded) that NULL have type void *. plain C
allows it to be defined as any null pointer constant.

the definition 0L is preserved for C++ rather than reverting to plain
0 to avoid dangerous behavior in non-conforming programs which use
NULL as a variadic sentinel. (it's impossible to use (void *)0 for C++
since C++ lacks the proper implicit pointer conversions, and other
popular alternatives like the GCC __null extension seem non-conforming
to the standard's requirements.)
2013-11-24 21:42:55 -05:00

23 lines
399 B
C

#ifndef _STDDEF_H
#define _STDDEF_H
#ifdef __cplusplus
#define NULL 0L
#else
#define NULL ((void*)0)
#endif
#define __NEED_ptrdiff_t
#define __NEED_size_t
#define __NEED_wchar_t
#include <bits/alltypes.h>
#if __GNUC__ > 3
#define offsetof(type, member) __builtin_offsetof(type, member)
#else
#define offsetof(type, member) ((size_t)( (char *)&(((type *)0)->member) - (char *)0 ))
#endif
#endif