Bugtraq: Re: gcc 4.1 bug miscompiles pointer range checks, may place you at risk

[leonleon77 () hotmail com]

perhaps instead of "c + len > c" being the test of pointer wraparound, one may use the following (if there is a desire 
to use pointer-based arithmetic)...

#define MAXPTR (char *)0xffffffff // this would differ on 64 bit systems

if (MAXPTR - c < len)
{
// we have a pointer wraparound...
}