Hi Rick,
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.brow...@gmail.com> 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:
>
> [r...@linux rick]$ cat t.c
> #include <stdio.h>
> int main()
> {
> void *ptr = 0;
> printf("%d \n", ptr+1);
> }
> [r...@linux rick]$ gcc t.c
> [r...@linux rick]$ ./a.out
> 1
> [r...@linux rick]$
>
> It compiles and runs fine ... !
>
> TIA,
>
> Rick
>
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