Some days ago i had the same question in my mind. While going through "The Linux Kernel Architecture" book (by Wolfgang Mauerer), i got the answer:
The GNU compiler supports arithmetic with void pointers as well as function pointers. The increment step is 1 byte. These are used by the kernel at various points.
Have fun.
Regards
Mayur
On Thu, Oct 8, 2009 at 7:42 AM, Rick Brown <rick.brown.3@xxxxxxxxx> wrote:
Hello list,
As far as I recall from K&R, isn't pointer arithmetic on a void
pointer banned? And any effort to do that results in an error -
because the compiler won't know by how much size to increment the
pointer for a statement like "ptr++"? But then how about this:
[rick@linux rick]$ cat t.c
#include <stdio.h>
int main()
{
void *ptr = 0;
printf("%d \n", ptr+1);
}
[rick@linux rick]$ gcc t.c
[rick@linux rick]$ ./a.out
1
[rick@linux rick]$
It compiles and runs fine ... !
TIA,
Rick
--
To unsubscribe from this list: send an email with
"unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx
Please read the FAQ at http://kernelnewbies.org/FAQ
