From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/9137 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: the size of the int type Date: Sat, 16 Jan 2016 14:09:29 +0100 Message-ID: <1452949769.30789.1.camel@inria.fr> References: <20160116110916.GA20353@openwall.com> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-Crfa1rjzZKNQjXQAqC0t" X-Trace: ger.gmane.org 1452949785 25015 80.91.229.3 (16 Jan 2016 13:09:45 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 16 Jan 2016 13:09:45 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-9150-gllmg-musl=m.gmane.org@lists.openwall.com Sat Jan 16 14:09:44 2016 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by 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Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.12.9-1+b1 Xref: news.gmane.org gmane.linux.lib.musl.general:9137 Archived-At: --=-Crfa1rjzZKNQjXQAqC0t Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am Samstag, den 16.01.2016, 14:09 +0300 schrieb croco@openwall.com: > On Fri, Jan 15, 2016 at 09:11:25PM +0000, Josiah Worcester wrote: >=20 > > You would do better to match the convention used on modern-day Unix > > systems, where int is 32-bit, long is the machine word size, and long l= ong > > is 64-bit. If you do this everything should pretty much function as it > > expects, with regard to the standard C types' sizes. >=20 > Let me second this. Please note that in case you implement int as 64-bit= , > then there will be either no 32-bit or no 16-bit integer type (at all), a= s > there's only the short which is in between char ant int; hence, well, the= re > will be a kind of problem with some typedefs from : either > int16_t/uint16_t or int32_t/uint32_t will actually have a size different > from what the name suggests, so you'll run into a trouble with > reading/analysing data in binary formats. You certainly shouldn't do it like that. If you can't support [u]intXX_t for some XX, you shouldn't define these types. These are optional types in the C standard, but if they are defined they must have the exact width, and the intXX_t must have two's complement representation. Mandatory are only the [u]int_leastXX_t types for XX =3D 8, 16, 32 and 64. But as the name indicates, these don't have to have the exact width. In any case you should just stick to the standard ABI of your platform. Everything else would be opening a can of worms. Jens --=20 :: INRIA Nancy Grand Est ::: Camus ::::::: ICube/ICPS ::: :: ::::::::::::::: office Strasbourg : +33 368854536 :: :: :::::::::::::::::::::: gsm France : +33 651400183 :: :: ::::::::::::::: gsm international : +49 15737185122 :: :: http://icube-icps.unistra.fr/index.php/Jens_Gustedt :: --=-Crfa1rjzZKNQjXQAqC0t Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlaaQQkACgkQD9PoadrVN+LELACgkvhzPLm+JPVZK91Q+tYA9f1T OfIAniUrtLzeK9etPSh7Hv/Uwy1OlDQb =dswr -----END PGP SIGNATURE----- --=-Crfa1rjzZKNQjXQAqC0t--