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Date:	Mon, 07 Apr 2014 08:16:13 -0600
From:	Eric Blake <eblake AT redhat DOT com>
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Subject:	Re: long_int vs int byte sizes
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On 04/07/2014 02:47 AM, Corinna Vinschen wrote:

>=20
> There's no standard which restricts the sizes of the datatypes in
> that way.  There's only this rule to follow:
>=20
>   sizeof (char) <=3D sizeof (short) <=3D sizeof (int) <=3D sizeof (long)

Well, there IS the C rule that sizeof(char)=3D=3D1, and also that char holds
>=3D 8 bits, short holds >=3D 8 bits, int holds >=3D 16 bits, long holds >=
=3D 32
bits.  There is also a POSIX rule that CHAR_BITS=3D=3D8 (so while C allows a
9-bit or 32-bit char [and yes, such machines exist, although rare],
POSIX does not allow that).  But in general, on most modern porting
platforms, 'long' is a redundant type - it will either be equal in size
to 'int' (typical for a 32-bit machine) or to a 'long long' (typical for
a 64-bit machine); it only mattered on 16-bit machines which are now
museum pieces.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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