linux-kernel - Re: [PATCH] use %p for pointers

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Date:	Thu, 12 Oct 2006 15:03:58 +0400
From:	Nikita Danilov <nikita@...sterfs.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jan Engelhardt <jengelh@...ux01.gwdg.de>, torvalds@...l.org,
	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>
Subject: Re: [PATCH] use %p for pointers

H. Peter Anvin writes:
 > Al Viro wrote:
 > > 
 > > %p will do no such thing in the kernel.  As for the difference...  %x
 > > might happen to work on some architectures (where sizeof(void *)==sizeof(int)),
 > > but it's not portable _and_ not right.  %p is proper C for that...
 > 
 > It's really too bad gcc bitches about %#p, because that's arguably The 
 > Right Thing.

Hm...

man 3 printf:

       p      The void * pointer argument is printed in hexadeci-
              mal (as if by %#x or %#lx).

so %p already has to output '0x', it's lib/vsprintf.c to blame for
non-conforming behavior. What about

Signed-off-by: Nikita Danilov <danilov@...il.com>

Index: git-linux/lib/vsprintf.c
===================================================================
--- git-linux.orig/lib/vsprintf.c
+++ git-linux/lib/vsprintf.c
@@ -408,7 +408,7 @@ int vsnprintf(char *buf, size_t size, co
 				}
 				str = number(str, end,
 						(unsigned long) va_arg(args, void *),
-						16, field_width, precision, flags);
+						16, field_width, precision, flags|SPECIAL);
 				continue;
 
 

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