/*-*- 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 <errno.h> #include <getopt.h> #include <stdbool.h> #include <stddef.h> #include "log.h" #include "macro.h" #include "string-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); } }