Mandeep Sandhu wrote:
> Hi All,
>
> This is more of a 'C' question than a kernel one. But since i'll be
> putting this
> in a module, I thought I'd ask here too...
>
> Whats the correct way to initialize a pointer?
>
> 1. char *p = 0;
> OR
> 2. char *p = NULL;
"[#3] An integer constant _expression_ with the value 0, or
such an _expression_ cast to type void *, is called a null
pointer constant."
You could do char *p = 1 - 1; char *q = 0; char *r = 1 / 2;
if you wish.
Thats an interesting way of writing zero! :)
I read some time ago (can't remember where!), that 0 is not always
an invalid address. Though I think the C compiler is supposed to generate
one for any such assignments (as shown above). Is this a C standard?
Are all compilers supposed to do it?
Shouldn't NULL be a better choice so that we can #define it to an invalid
value, where this #define is specific to an architechture?? CMIIW.
Thanks,
-mandeep
