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| author | Rich Felker <dalias@aerifal.cx> | 2013-11-24 21:42:55 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2013-11-24 21:42:55 -0500 |
| commit | c8a9c22173f485c8c053709e1dfa0a617cb6be1a (patch) | |
| tree | 6e09d7e73bbff957b45370d412cc6299fe51eb37 /include/wchar.h | |
| parent | 7e771e62e78944b9d1fe7e78ef71422b9d51f275 (diff) | |
| download | musl-c8a9c22173f485c8c053709e1dfa0a617cb6be1a.tar.gz | |
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.)
Diffstat (limited to 'include/wchar.h')
| -rw-r--r-- | include/wchar.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/wchar.h b/include/wchar.h index fd5aac5f..9fd967cc 100644 --- a/include/wchar.h +++ b/include/wchar.h @@ -33,7 +33,11 @@ extern "C" { #define WCHAR_MIN (-1-0x7fffffff+L'\0') #endif +#ifdef __cplusplus #define NULL 0L +#else +#define NULL ((void*)0) +#endif #undef WEOF #define WEOF 0xffffffffU |