Date: Fri, 26 Jul 2013 09:34:08 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Jordan Hubbard <jordan.hubbard@gmail.com> Cc: arch@FreeBSD.org Subject: Re: General purpose library for name/value pairs. Message-ID: <20130726073408.GA1383@garage.freebsd.pl> In-Reply-To: <818200C6-2AF2-465D-873B-CA610A9C763A@gmail.com> References: <20130704215329.GG1402@garage.freebsd.pl> <4818.1373008073@critter.freebsd.dk> <20130705195255.GB25842@garage.freebsd.pl> <60317.1373055040@critter.freebsd.dk> <20130708150308.GE1383@garage.freebsd.pl> <717D098F-D07E-45B0-B9F0-8D8BCEF06923@mail.turbofuzz.com> <20130708213351.GB1405@garage.freebsd.pl> <D2E98A8F-F765-4A56-96CD-4410944A2910@turbofuzz.com> <20130725202832.GD1400@garage.freebsd.pl> <818200C6-2AF2-465D-873B-CA610A9C763A@gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--liOOAslEiF7prFVr
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
On Fri, Jul 26, 2013 at 12:26:15AM -0700, Jordan Hubbard wrote:
>=20
> On Jul 25, 2013, at 1:28 PM, Pawel Jakub Dawidek <pjd@freebsd.org> wrote:
>=20
> > Returning to this thread after a short break. I removed all
> > {,u}int{8,16.32.64} types and implemented only 'number' type which is
> > uint64_t. Looks much nicer now.
>=20
> Indeed!
>=20
> > Not sure if you looked at the API, but with nvlist you can lookup
> > element by name:
> >=20
> > const char *nvlist_get_string(const nvlist_t *nvl, const char *name);
>=20
> Sorry, I must have misunderstood that function since I thought it would j=
ust get you a named string - you can also do something like this?
>=20
> { { "name", "Pawel Jakub Dawidek" }, { "age", 37 }, { "favorite-float-nu=
m", 1.E027 }, { "likes", { "cats", "ZFS", "fashion models" } }, { "company"=
, "wheel systems" } }
>=20
> And then look up "name" and get a string, "age" and get a number, "favori=
te-float-num" for a float, "likes" for an array of strings, etc?
Exactly. The code would look like this:
static const char * const *likes =3D {
"cats",
"ZFS",
"fashion models"
};
nvlist_t *nvl;
nvl =3D nvlist_create(0);
nvlist_add_string(nvl, "name", "Pawel Jakub Dawidek");
nvlist_add_number(nvl, "age", 37); /* XXX: Not my age, yet:) */
/* No floats. */
nvlist_add_array_string(nvl, "likes", likes, 3);
nvlist_add_string(nvl, "company", "Wheel Systems");
if (nvlist_error(nvl) !=3D 0)
errx(1, "Unable to create nvlist.");
Then:
printf("Name: %s\nAge: %d\nCompany %s\n",
nvlist_get_string(nvl, "name"),
(int)nvlist_get_number(nvl, "age"),
nvlist_get_string(nvl, "company"));
--=20
Pawel Jakub Dawidek http://www.wheelsystems.com
FreeBSD committer http://www.FreeBSD.org
Am I Evil? Yes, I Am! http://mobter.com
--liOOAslEiF7prFVr
Content-Type: application/pgp-signature
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.20 (FreeBSD)
iEYEARECAAYFAlHyJnAACgkQForvXbEpPzTIMgCg5DbrGXJTWqIyjaZrJWrnGOvT
VkEAoK+HWaWyl8E2OXHyxVwop8ciSXvq
=j0XC
-----END PGP SIGNATURE-----
--liOOAslEiF7prFVr--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20130726073408.GA1383>