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dca59f62 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include "util.h" | |
23 | #include "verbs.h" | |
24 | ||
25 | int dispatch_verb(int argc, char *argv[], const Verb verbs[], void *userdata) { | |
26 | const Verb *verb; | |
27 | const char *name; | |
28 | unsigned i; | |
29 | int left; | |
30 | ||
31 | assert(verbs); | |
32 | assert(verbs[0].dispatch); | |
33 | assert(argc >= 0); | |
34 | assert(argv); | |
35 | assert(argc >= optind); | |
36 | ||
37 | left = argc - optind; | |
38 | name = argv[optind]; | |
39 | ||
40 | for (i = 0;; i++) { | |
41 | bool found; | |
42 | ||
43 | /* At the end of the list? */ | |
44 | if (!verbs[i].dispatch) { | |
45 | if (name) | |
46 | log_error("Unknown operation %s.", name); | |
47 | else | |
48 | log_error("Requires operation parameter."); | |
49 | return -EINVAL; | |
50 | } | |
51 | ||
43343ee7 | 52 | if (name) |
dca59f62 | 53 | found = streq(name, verbs[i].verb); |
43343ee7 LP |
54 | else |
55 | found = !!(verbs[i].flags & VERB_DEFAULT); | |
dca59f62 LP |
56 | |
57 | if (found) { | |
58 | verb = &verbs[i]; | |
59 | break; | |
60 | } | |
61 | } | |
62 | ||
43343ee7 LP |
63 | assert(verb); |
64 | ||
65 | if (!name) | |
66 | left = 1; | |
67 | ||
dca59f62 LP |
68 | if (verb->min_args != VERB_ANY && |
69 | (unsigned) left < verb->min_args) { | |
70 | log_error("Too few arguments."); | |
71 | return -EINVAL; | |
72 | } | |
73 | ||
74 | if (verb->max_args != VERB_ANY && | |
75 | (unsigned) left > verb->max_args) { | |
540d8581 | 76 | log_error("Too many arguments."); |
dca59f62 LP |
77 | return -EINVAL; |
78 | } | |
79 | ||
43343ee7 LP |
80 | if (name) |
81 | return verb->dispatch(left, argv + optind, userdata); | |
82 | else { | |
83 | char* fake[2] = { | |
84 | (char*) verb->verb, | |
85 | NULL | |
86 | }; | |
87 | ||
88 | return verb->dispatch(1, fake, userdata); | |
89 | } | |
dca59f62 | 90 | } |