| /*-*- 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 = streq(name, verbs[i].verb); |
| else |
| found = !!(verbs[i].flags & VERB_DEFAULT); |
| |
| if (found) { |
| verb = &verbs[i]; |
| break; |
| } |
| } |
| |
| assert(verb); |
| |
| if (!name) |
| left = 1; |
| |
| 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 arguments."); |
| return -EINVAL; |
| } |
| |
| if (name) |
| return verb->dispatch(left, argv + optind, userdata); |
| else { |
| char* fake[2] = { |
| (char*) verb->verb, |
| NULL |
| }; |
| |
| return verb->dispatch(1, fake, userdata); |
| } |
| } |