X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fcommand-line.c;h=a2a43a1c3ce0426793cdbf21a59d35b96ae9c04f;hb=36775dad3505929f8370166c33e8e0f04ca96c1c;hp=e0bd881108a62722fd7ee5636fb0ad63b46e94a7;hpb=064af42167bf4fc9aaea2702d80ce08074b889c0;p=openvswitch

diff --git a/lib/command-line.c b/lib/command-line.c
index e0bd8811..a2a43a1c 100644
--- a/lib/command-line.c
+++ b/lib/command-line.c
@@ -1,23 +1,24 @@
 /*
- * Copyright (c) 2008 Nicira Networks.
+ * Copyright (c) 2008, 2009 Nicira Networks.
  *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
  *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 #include <config.h>
 #include "command-line.h"
 #include <getopt.h>
 #include <limits.h>
+#include <stdlib.h>
 #include "util.h"
 #include "vlog.h"
 
@@ -47,3 +48,42 @@ long_options_to_short_options(const struct option options[])
     return xstrdup(short_options);
 }
 
+/* Runs the command designated by argv[0] within the command table specified by
+ * 'commands', which must be terminated by a command whose 'name' member is a
+ * null pointer.
+ *
+ * Command-line options should be stripped off, so that a typical invocation
+ * looks like "run_command(argc - optind, argv + optind, my_commands);". */
+void
+run_command(int argc, char *argv[], const struct command commands[])
+{
+    const struct command *p;
+
+    if (argc < 1) {
+        ovs_fatal(0, "missing command name; use --help for help");
+    }
+
+    for (p = commands; p->name != NULL; p++) {
+        if (!strcmp(p->name, argv[0])) {
+            int n_arg = argc - 1;
+            if (n_arg < p->min_args) {
+                ovs_fatal(0, "'%s' command requires at least %d arguments",
+                          p->name, p->min_args);
+            } else if (n_arg > p->max_args) {
+                ovs_fatal(0, "'%s' command takes at most %d arguments",
+                          p->name, p->max_args);
+            } else {
+                p->handler(argc, argv);
+                if (ferror(stdout)) {
+                    ovs_fatal(0, "write to stdout failed");
+                }
+                if (ferror(stderr)) {
+                    ovs_fatal(0, "write to stderr failed");
+                }
+                return;
+            }
+        }
+    }
+
+    ovs_fatal(0, "unknown command '%s'; use --help for help", argv[0]);
+}