ADD ajout d'une version de protocole, chaque message du client est taggé avec la...
[euphorik.git] / modules / erl / euphorik_common.erl
1 % coding: utf-8
2 % Copyright 2008 Grégory Burri
3 %
4 % This file is part of Euphorik.
5 %
6 % Euphorik is free software: you can redistribute it and/or modify
7 % it under the terms of the GNU General Public License as published by
8 % the Free Software Foundation, either version 3 of the License, or
9 % (at your option) any later version.
10 %
11 % Euphorik is distributed in the hope that it will be useful,
12 % but WITHOUT ANY WARRANTY; without even the implied warranty of
13 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 % GNU General Public License for more details.
15 %
16 % You should have received a copy of the GNU General Public License
17 % along with Euphorik. If not, see <http://www.gnu.org/licenses/>.
18 %
19 % Module avec plein de bordel utile à l'intérieur
20 % @author G.Burri
21
22 -module(euphorik_common).
23 -export([
24 serialize_ip/1,
25 unserialize_ip/1,
26 ceiling/1
27 ]).
28
29
30 % Arrondi un float à l'entier supérieur.
31 % Bizarre, cette fonction n'existe pas dans la stdlib.
32 % Pas utilisé mais bon ca me fait de la peine de l'enlever.
33 ceiling(X) ->
34 T = trunc(X),
35 case (X - T) of
36 Neg when Neg < 0 -> T;
37 Pos when Pos > 0 -> T + 1;
38 _ -> T
39 end.
40
41
42 serialize_ip(undefined) ->
43 "<unknown IP>";
44 serialize_ip(IP) ->
45 lists:flatten(io_lib:format("~w.~w.~w.~w", tuple_to_list(IP))).
46
47
48 unserialize_ip(IP) ->
49 case io_lib:fread("~d.~d.~d.~d", IP) of
50 {ok, [A, B, C, D], []} -> {A, B, C, D};
51 _ -> erreur
52 end.