Re: Support for multi-position electro-mechanical keylocks

[Anders Magnusson <ragge%ludd.ltu.se@localhost>]

Marc Balmer wrote:
> Am 03.08.2009 um 16:58 schrieb Peter Seebach:
>
> > In message <7FA34163-C54B-435C-B147-DA2BBE06F848%msys.ch@localhost>, Marc 
> > Balmer writes:
> > > Am 03.08.2009 um 16:23 schrieb David Holland:
> > >
> > > > On Mon, Aug 03, 2009 at 03:45:34AM +0000, David Holland wrote:
> > > > > On Sun, Aug 02, 2009 at 11:54:09AM +0200, Marc Balmer wrote:
> > > > > > While preparing a hardware workshop and playing with multi-position
> > > > > > keylocks, [...]
> > > > > >
> > > > > > +       int                     __map[GPIOLOCK_MAXPINS];
> > > >
> > > > Er. That was supposed to say "why the underscores?"
> > >
> > > They are in the original code.  So why not?
> >
> > As a general rule, you shouldn't prefix things with underscores in C.
> > (C9x 7.1.3:  "All identifiers that begin with an underscore and
> > either an uppercase letter or another underscore are always reserved
> > for any use.")
>
> This section applies to identifiers in header files, i.e. to exported 
> APIs, not to structure members.
Exactly, so a header file connected to the system that includes 
containing '#define __map :32'
will cause your C code to fail compilation... :-)

-- Ragge