netdev - Re: [PATCH net-2.6.24] introduce MAC_FMT/MAC

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Message-Id: <1188248263.18004.131.camel@localhost>
Date:	Mon, 27 Aug 2007 13:57:42 -0700
From:	Joe Perches <joe@...ches.com>
To:	David Miller <davem@...emloft.net>
Cc:	johannes@...solutions.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-2.6.24] introduce MAC_FMT/MAC_ARG

On Mon, 2007-08-27 at 13:41 -0700, David Miller wrote:
> From: Johannes Berg <johannes@...solutions.net>
> Date: Mon, 27 Aug 2007 12:54:09 +0200
> > #define MAC_FMT "%s"
> > #define MAC_ARG(a) ({char __buf[18]; print_mac(a, __buf); __buf;})

> I don't think this works.

$ cat test_fmt.c
#include <stdio.h>
#include <stdlib.h>

#define MAC_FMT "%s"
#define MAC_ARG(a) ({char __buf[18]; print_mac(a, __buf); __buf;})

int print_mac(const char* p, char* b)
{
  return sprintf(b, "%02x:%02x:%02x:%02x:%02x:%02x",
		 p[0], p[1], p[2], p[3], p[4], p[5]);
}

int main(int argc, char** argv)
{
  char m1[6] = {1,2,3,4,5,6};
  char m2[6] = {6,5,4,3,2,1};

  printf("m1: " MAC_FMT " m2: " MAC_FMT "\n", MAC_ARG(m1), MAC_ARG(m2));
  return 0;
}

$ gcc test_fmt.c
$ ./a.out
m1: 01:02:03:04:05:06 m2: 06:05:04:03:02:01


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