summaryrefslogtreecommitdiff
path: root/src/shared/verbs.c
blob: ead2ff60f4cd448b1f3f5748349814cb49eb3aad (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2014 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include "util.h"
#include "verbs.h"

int dispatch_verb(int argc, char *argv[], const Verb verbs[], void *userdata) {
        const Verb *verb;
        const char *name;
        unsigned i;
        int left;

        assert(verbs);
        assert(verbs[0].dispatch);
        assert(argc >= 0);
        assert(argv);
        assert(argc >= optind);

        left = argc - optind;
        name = argv[optind];

        for (i = 0;; i++) {
                bool found;

                /* At the end of the list? */
                if (!verbs[i].dispatch) {
                        if (name)
                                log_error("Unknown operation %s.", name);
                        else
                                log_error("Requires operation parameter.");
                        return -EINVAL;
                }


                if (!name)
                        found = !!(verbs[i].flags & VERB_DEFAULT);
                else
                        found = streq(name, verbs[i].verb);

                if (found) {
                        verb = &verbs[i];
                        break;
                }
        }

        if (verb->min_args != VERB_ANY &&
            (unsigned) left < verb->min_args) {
                log_error("Too few arguments.");
                return -EINVAL;
        }

        if (verb->max_args != VERB_ANY &&
            (unsigned) left > verb->max_args) {
                log_error("Too many argument.s");
                return -EINVAL;
        }

        return verb->dispatch(left, argv + optind, userdata);
}