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From: lvc@danews.UUCP (Larry Cipriani)
Newsgroups: net.lang.c
Subject: What ever happened to %r in printf ?
Message-ID: <126@danews.UUCP>
Date: Thu, 29-May-86 16:21:38 EDT
Article-I.D.: danews.126
Posted: Thu May 29 16:21:38 1986
Date-Received: Fri, 30-May-86 17:46:46 EDT
Distribution: na
Organization: AT&T Bell Labs, Columbus OH
Lines: 32

Does anyone know why the %r formatting option of printf was
never documented on older UNIX systems ?  It doesn't exist
on the Sys 5 Rel 2 we have.

This option lets you do things like:

	doprint("usage: %s: not found", argv[0]);

and for doprint we have:

doprint(fmt)
	char *fmt;
{
	stuff ...

	printf("%r", &fmt);

	other stuff ...
}

The %r tells printf to use &fmt as the address of a
printf formatting string, and to get the arguments
for it off the stack.  I don't know if it would
work if fmt contained another %r.  Can vprintf be
used to produce the same result ?

Thanks,
-- 

Larry Cipriani		AT&T Network Systems
danews!lvc		Mail responses to ihnp4!cbsck!lvc please - thanks
		"Nothing is worse than an itch you can never scratch."