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X-HELO: calimero.vinschen.de
Date: Mon, 7 Apr 2014 17:51:31 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: long_int vs int byte sizes
Message-ID: <20140407155131.GR2061@calimero.vinschen.de>
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On Apr  7 09:39, Eric Blake wrote:
> On 04/07/2014 08:42 AM, Corinna Vinschen wrote:
> > On Apr  7 08:16, Eric Blake wrote:
> >> On 04/07/2014 02:47 AM, Corinna Vinschen wrote:
> >>
> >>>
> >>> There's no standard which restricts the sizes of the datatypes in
> >>> that way.  There's only this rule to follow:
> >>>
> >>>   sizeof (char) <=3D sizeof (short) <=3D sizeof (int) <=3D sizeof (lo=
ng)
> >>
> >> 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 hol=
ds >=3D 32
> >> bits.  There is also a POSIX rule that CHAR_BITS=3D=3D8 (so while C al=
lows a
> >> 9-bit or 32-bit char [and yes, such machines exist, although rare],
> >> POSIX does not allow that).
> >=20
> > Apart from POSIX, where is that defined?
>=20
> C99 5.2.4.2.1 Sizes of integer types <limits.h>
>=20
> requires CHAR_BIT to be 8 or larger, UCHAR_MAX to be 255 or larger,
> USHRT_MAX to be 65535 or larger (oh, so I was wrong above; 8-bit short
> is not allowed), UINT_MAX to be 65535 or larger, ULONG_MAX to be
> 4294967295 or larger, and ULLONG_MAX to be 18446744073709551615 or larger.

C99 actually requires that?  Wow.  Modern times...

> > Xstormy16?
>=20
> Okay, so maybe 16-bit machines aren't all museum pieces - but they also
> aren't portability targets for the majority of programs run on cygwin :)

Probably not, but I don't know a Cygwin application to control a
washing machine either :)


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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