Preprocessor macro to quote its argument

[R. Kym Horsell]

In article <GJG5YDA at ggpc2.ferranti.com> peter at ficc.ferranti.com (Peter da Silva) writes:
\\\
>If you define CTRL(c) ((*#c)^('\177'^'?')) it'll handle '^?' for delete as
>well, at the expense of producing gibberish for CTRL(a).

I think the original

#define	CTRL(c)	((*#c)-64)

did this correctly anyway. It just makes me nervous that it also didn't
handle lower-case; I came across a nasty bug once involving the
programmer's misunderstanding of what CTRL(x) would match!

-Kym Horsell