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On Tue, 30 Sep 2008, William "Chops" Westfield wrote:

>=20
> On Sep 22, 2008, at 9:41 AM, sergio masci wrote:
>=20
> >> I'm dealing with "pointers to 8-Bit byte" a lot. Some times though, =
=20
> >> I want to read a 16-Bit value from the network frame, and a handy =20
> >> way to do this is:
> >>
> >>    *(uint16_t const *)p
>=20
> Bad programmer.  Not portable to systems with different endianness or =20
> alignment restrictions.  Things like this should be hidden in a macro:
>      GETNET16(p)
>=20
> Which can have a definition somewhere between *(uint16_t *)(p) and
>      NTOHS(GETSHORT(p))
>=20
> BillW
>=20

Actually I'm not the author of the few lines you cited. I actually=20
responded with the following:


On Mon, 22 Sep 2008, sergio masci wrote:
>
> On Mon, 22 Sep 2008, Tom=C3=A1s =C3=93 h=C3=89ilidhe wrote:
>
> > Peter Loron wrote:
> > > I'm a major fan of type checking.
> >
> > Here here!
> >
> > I'm doing low-level network programming in C at the moment, and I'm
> > dealing with "pointers to 8-Bit byte" a lot. Some times though, I want
> > to read a 16-Bit value from the network frame, and a handy way to do
> > this is:
> >
> >     *(uint16_t const *)p
> >
> > One of the times though, I neglected to put in the second asterisk, so =
I
> > had:
> >
> >     *(uint16_t const)p
> >
> > Of course though the compiler puked straight away when I tried to
> > compile it: TYPE MISMATCH! If it had silently compiled it then I would
> > have had a hard-to-track-down bug. Type mismatch is one of the most
> > beautiful errors!
>
> Actually 'C's casting mechanism is BAD BAD BAD!!!!
>
> It breaks 'C's type checking in ways many programmers don't even realise.
> Again we are forced to rely on programmer disciplin to prevent obscure
> bugs from creaping into code.
>
> Regards
> Sergio Masci

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