* about gcc library
@ 2003-04-08 18:15 Mehdi Khaldi
2003-04-08 18:57 ` Phil Edwards
0 siblings, 1 reply; 2+ messages in thread
From: Mehdi Khaldi @ 2003-04-08 18:15 UTC (permalink / raw)
To: 'gcc@gcc.gnu.org'
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
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: about gcc library
2003-04-08 18:15 about gcc library Mehdi Khaldi
@ 2003-04-08 18:57 ` Phil Edwards
0 siblings, 0 replies; 2+ messages in thread
From: Phil Edwards @ 2003-04-08 18:57 UTC (permalink / raw)
To: Mehdi Khaldi; +Cc: 'gcc@gcc.gnu.org'
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.
--
If ye love wealth greater than liberty, the tranquility of servitude greater
than the animating contest for freedom, go home and leave us in peace. We seek
not your counsel, nor your arms. Crouch down and lick the hand that feeds you;
and may posterity forget that ye were our countrymen. - Samuel Adams
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