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[Frama-c-discuss] "\at(var, Pre)" before a loop

Dear all,

I have a qestion regarding the value of \at(var, Pre) before a loop.
In the following example, is the value of \at(pString, Pre) in the loop
invariant annotations before the loop has a constant value during all
iterations and is equal to the value of the pString original argument?
In other words, is this loop invariant correct?

/*@
[...]
*/
void myFunction(char *pString, int nbBytes)
{
/*@
loop invariant i == pString - \at(pString, Pre);
*/
for (i=0 ; i<nbBytes ; i++)
{
	if (*pString == '\0')
	{
		break;
	}
	pString++;
}
}

Thanks in advance,
--
Thomas P.

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