Subject: Re: error function re-factoring.
To: Roland Illig <>
From: Iain Hibbert <>
List: tech-userlevel
Date: 07/29/2006 12:51:53
On Sat, 29 Jul 2006, Roland Illig wrote:

> Matthias Drochner wrote:
> > Whether error messages are printed or not... not
> > sure what is right. But if error messages are printed,
> > they should not contain the strings passed by the user
> > as they could contain escape sequences or sensitive
> > information.
> Would that mean that _all_ NetBSD utilities, even cat(1), would have to be
> rewritten to never output control characters when that is not expected? What
> would be the correct error message if a file whose name contains special
> characters cannot be found?

no, its the difference between

	err(EXIT_FAILURE, *argv);	/* bad */


	err(EXIT_FAILURE, "%s", *argv);	/* good */

as the first could possibly cause the program to print private data
pointed to from the stack.