Thread: Pointer arithmetic

What's the correct way to do pointer arithmetic in this example ?

Say I store a struct in a buffer at some offset and then want to get a pointer to it. e.g.

Code:

int offset;
sometype mystruct, *ptr;
char buff[32768];

memcpy(buff[offset], mystruct, sizeof(mystruct));

Is the pointer

ptr = (mystruct *)buffer[offset];

or

ptr = (mystruct *)buffer + offset;

or

ptr = (mystruct *)((&buffer[0]) + offset);

or something else ? I'm getting confused - and coredumps ...

thks