printf without any argument exits ash

[Michael Abbott]

On Wed, 10 Dec 2008, Alexander Griesser wrote:
> Another strange problem I encountered today and I'm not sure if it's my
> fault:
> 
> When running busybox on my desktop system (or on my thinclients, doesn't
> matter) I encountered a strange problem with the "printf" applet today
> (v1.13.1):
> 
> But, when I run "printf" without any argument, it simply kills the shell

Wow!  Same here on busybox v1.12.2:

	$ ssh root at 172.23.252.9
	# printf
	BusyBox v1.12.2 (2008-11-11 09:49:33 GMT) multi-call binary
	
	No help available.
	
	Connection to 172.23.252.9 closed.
	$

Similarly, if I run a fresh shell it kills the sub-shell.

Interestingly, this is only if I run it as a shell (ash) built in:

	# /usr/bin/printf
	BusyBox v1.12.2 (2008-11-11 09:49:33 GMT) multi-call binary
	
	Usage: printf FORMAT [ARGUMENT...]
	
	Format and print ARGUMENT(s) according to FORMAT,
	where FORMAT controls the output exactly as in C printf
	
	#

Looks like the behaviour I'd expect there.