about gcc library

about gcc library

[Mehdi Khaldi]

Hi,
How to check if a pointer is allocated or not?

I do "if(p == NULL)". This assumes that the developer did "p = NULL;"
But if he didn't do that, how can I know if the pointer is allocated or not?

Example :

Int *p;

If(p == NULL)
	Printf("P = NULL\n");
Else
	Memset(p, 0, sizeof(int));

I'd like to know if the pointer is allocated.

Thanks

Re: about gcc library

[Phil Edwards]

On Tue, Apr 08, 2003 at 12:29:17PM -0400, Mehdi Khaldi wrote:
> Hi,
> How to check if a pointer is allocated or not?
> 
> I do "if(p == NULL)". This assumes that the developer did "p = NULL;"
> But if he didn't do that, how can I know if the pointer is allocated or not?
> 
> Example :
> 
> Int *p;
> 
> If(p == NULL)
> 	Printf("P = NULL\n");
> Else
> 	Memset(p, 0, sizeof(int));
> 
> I'd like to know if the pointer is allocated.

That's not how the C language works.  You need a textbook.  This list is
for the development /of/ GCC itself, not how to program in C.

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