Date: Sat, 30 Aug 2003 20:20:37 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?= <des@des.no> Cc: Jake Burkholder <jake@FreeBSD.org> Subject: Re: cvs commit: src/sys/dev/fb fb.c Message-ID: <20030830200408.I3440@gamplex.bde.org> In-Reply-To: <xzp1xv4cd93.fsf@dwp.des.no> References: <200308240242.h7O2g1Eb085767@repoman.freebsd.org> <xzp1xv4cd93.fsf@dwp.des.no>
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On Sat, 30 Aug 2003, Dag-Erling [iso-8859-1] Sm=F8rgrav wrote:
> Jake Burkholder <jake@FreeBSD.org> writes:
> > Log:
> > Changed ??? to foo in dead code since ??? screws up my editor.
>
> ??? also confuses the compiler ("invalid trigraph blah blah") and
> should be avoided in C code.
Actually, "???" is a valid non-trigraph that doesn't confuse C compilers.
It just sometomes forms a trigraph when mixed with other punctuation.
E.g., "???)" forms the character "?" followed by the trigraph "??)".
So "???)" is converted to "?]" by C compilers.
In fb.c, "???" was followed by ",", so it was just a syntax error (one
of many bugs in the dead code).
Bruce
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