On Mon, 2007-08-27 at 13:41 -0700, David Miller wrote:
> From: Johannes Berg <[EMAIL PROTECTED]>
> 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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