Why all this fuss about CTRL(X) ??

[arnold at emory.UUCP]

I hope somebody hasn't beat me to this. The whole fuss about

#define CTRL(X)	('X' & 037)	/* ascii! */

in the Reiser cpp not being doable in ANSI C can be answered this way:

#define CTRL(X)	(' ## X ## ' & 037)	/* ascii only */

which uses the token concatenation operator to produce the character
constant. This should also work for things like

	esc = CTRL([);

I am sure someone will correct me if I am wrong. Now, we can hopefully put
this to rest!

( Personally, I think CTRL(X) is bad style;

#define ctrl(x)	((x) & 037)

and using ctrl('x') makes the most sense to me. It is legal in both K&R C and
ANSI C, and allows using the macro on a char or int variable, not just on
a constant. So there. :-)
-- 
Arnold Robbins
CSNET:	arnold at emory	BITNET:	arnold at emoryu1
ARPA:	arnold%emory.csnet at csnet-relay.arpa
UUCP:	{ akgua, decvax, gatech, sb1, sb6, sunatl }!emory!arnold