NULL

[Ahmed Masud]

Artem B. Bityuckiy wrote:
> 
> Hello
> 
> I've found than there is no "standard" place for NULL in Newlib. NULL is 
> defined in stdio.h, stdlib.h, locale.h, time.h, wchar.h and in a variety 
> of internal .c files. In all cases there are
> 
> #ifndef NULL
> #define NULL
> #endif
> 
> in these files. What is the reason of such many NULL definition? I need 
> NULL for internal use when I'm changing Newlib. And I've also defined 
> one more version of NULL. May be it is better to add NULL definition to 
> somewhere like sys/_types.h ?

May be desirable to actually put it in stdio.h; or in its own file 
null.h. In addition NULL should be defined as:

#ifndef NULL
#define NULL ((void *)0)
#endif

Not as a blank.

Cheers,

Ahmed