[Gllug] Pointer arithmetic with void *

[Tethys]

Just curious. Does anyone know what the C standard says about pointer
arithmetic with void *? for example:

	void *ptr;

	ptr = mmap(NULL, 1024, PROT_READ, MAP_SHARED, fd, 0);
	ptr++;

Where is ptr pointing? 1 byte from the start of the file? One
"pointer length" (i.e., 4 or 8 bytes from the start of the file)?
Something else entirely?

Empirical evidence shows it to be a 1 byte increment on Linux and
Solaris, but can this be relied upon, or is it just an implementation
detail of gcc (which I used on both)? K&R doesn't say either way, and
I don't want to be making assumptions that may prove non-portable.

Does anyone have the ISO C specs to confirm it one way or the other?

Tet

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