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Re: [Libguestfs] [PATCH] mllib: Getopt: fix integer parsing



On Monday, 18 July 2016 09:49:37 CEST Richard W.M. Jones wrote:
> On Mon, Jul 18, 2016 at 10:47:12AM +0200, Pino Toscano wrote:
> > I still don't understand why we need to handle values bigger than int
> > (as in C int, i.e. signed 32 bits) at all -- neither it is actually
> > needed, nor it would be coherent in 32bit vs 64bit builds.
> 
> If that's what you decide then that is fine too.  My test patch
> checked that 63 bit integers could be returned (on 64 bit arch) but we
> can drop that test.

Now that I think more about it, allowing more than 31bit integers as
'int' would cause problems later on; let's take for example the
handling of memsize in few OCaml tools:

  [ "-m"; "--memsize" ], Getopt.Int ("mb", set_memsize), ...

later on, in the C implementation of Guestfs.set_memsize there is

  int memsize = Int_val (memsizev);

this would truncated when extracted, so not much useful at this point
already; even when changing the above, what follows is:

  r = guestfs_set_memsize (g, memsize);

considering the C API takes a 32bit signed integer, it would be
truncated anyway.  In the end, allowing big integers for
Getopt.Int/Set_int is not really doable/worth it.

-- 
Pino Toscano

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