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-rw-r--r--src/basic/verbs.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/src/basic/verbs.c b/src/basic/verbs.c
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+/*-*- 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);
+ }
+}