QA·C Help - 0507

	0507	[u] Arithmetic operation on constant NULL pointer.

Dataflow - NULL pointers		REFERENCE - ISO:C90-6.2.2.3 Pointers

Pointer arithmetic is being performed on a null pointer constant.

Internal representation of a null pointer constant is implementation-defined and may not necessarily be bitwise 0. A null pointer constant may be assigned or compared, but any attempt to perform arithmetic operations on it should be viewed as suspicious and non-portable.

For example:


/*PRQA S 489,2017,3199,3203,3408 ++*/

#define NULL (void *)0

extern void foo(void)
{
    int *p;

    p = (int *)(NULL) + 1 ;            /* Message 0507 */
}

See also:

0508 [u] Definite arithmetic operation on NULL pointer.
0509 [u] Apparent arithmetic operation on NULL pointer.
0510 Possible arithmetic operation on NULL pointer.

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