+ if (strchr (argv[i], ' ') == NULL)
+ printf (" %s", argv[i]);
+ else
+ printf (" '%s'", argv[i]);
+ printf ("\n");
+
+ return argv;
+}
+
+/* Parses options in ARGV[]
+ and returns the first non-option argument. */
+static char **
+parse_options (char **argv)
+{
+ for (; *argv != NULL && **argv == '-'; argv++)
+ {
+ char *save_ptr;
+ char *name = strtok_r (*argv, "=", &save_ptr);
+ char *value = strtok_r (NULL, "", &save_ptr);
+
+ if (!strcmp (name, "-h"))
+ usage ();
+ else if (!strcmp (name, "-q"))
+ shutdown_configure (SHUTDOWN_POWER_OFF);
+ else if (!strcmp (name, "-r"))
+ shutdown_configure (SHUTDOWN_REBOOT);
+#ifdef FILESYS
+ else if (!strcmp (name, "-f"))
+ format_filesys = true;
+ else if (!strcmp (name, "-filesys"))
+ filesys_bdev_name = value;
+ else if (!strcmp (name, "-scratch"))
+ scratch_bdev_name = value;
+#ifdef VM
+ else if (!strcmp (name, "-swap"))
+ swap_bdev_name = value;
+#endif
+#endif
+ else if (!strcmp (name, "-rs"))
+ random_init (atoi (value));
+ else if (!strcmp (name, "-mlfqs"))
+ thread_mlfqs = true;
+#ifdef USERPROG
+ else if (!strcmp (name, "-ul"))
+ user_page_limit = atoi (value);
+#endif
+ else
+ PANIC ("unknown option `%s' (use -h for help)", name);
+ }
+
+ /* Initialize the random number generator based on the system
+ time. This has no effect if an "-rs" option was specified.
+
+ When running under Bochs, this is not enough by itself to
+ get a good seed value, because the pintos script sets the
+ initial time to a predictable value, not to the local time,
+ for reproducibility. To fix this, give the "-r" option to
+ the pintos script to request real-time execution. */
+ random_init (rtc_get_time ());
+
+ return argv;
+}
+
+/* Runs the task specified in ARGV[1]. */
+static void
+run_task (char **argv)
+{
+ const char *task = argv[1];
+
+ printf ("Executing '%s':\n", task);
+#ifdef USERPROG
+ process_wait (process_execute (task));
+#else
+ run_test (task);
+#endif
+ printf ("Execution of '%s' complete.\n", task);
+}
+
+/* Executes all of the actions specified in ARGV[]
+ up to the null pointer sentinel. */
+static void
+run_actions (char **argv)
+{
+ /* An action. */
+ struct action
+ {
+ char *name; /* Action name. */
+ int argc; /* # of args, including action name. */
+ void (*function) (char **argv); /* Function to execute action. */
+ };
+
+ /* Table of supported actions. */
+ static const struct action actions[] =
+ {
+ {"run", 2, run_task},
+#ifdef FILESYS
+ {"ls", 1, fsutil_ls},
+ {"cat", 2, fsutil_cat},
+ {"rm", 2, fsutil_rm},
+ {"extract", 1, fsutil_extract},
+ {"append", 2, fsutil_append},
+#endif
+ {NULL, 0, NULL},
+ };
+
+ while (*argv != NULL)
+ {
+ const struct action *a;
+ int i;
+
+ /* Find action name. */
+ for (a = actions; ; a++)
+ if (a->name == NULL)
+ PANIC ("unknown action `%s' (use -h for help)", *argv);
+ else if (!strcmp (*argv, a->name))
+ break;
+
+ /* Check for required arguments. */
+ for (i = 1; i < a->argc; i++)
+ if (argv[i] == NULL)
+ PANIC ("action `%s' requires %d argument(s)", *argv, a->argc - 1);
+
+ /* Invoke action and advance. */
+ a->function (argv);
+ argv += a->argc;
+ }
+
+}
+
+/* Prints a kernel command line help message and powers off the
+ machine. */
+static void
+usage (void)
+{
+ printf ("\nCommand line syntax: [OPTION...] [ACTION...]\n"
+ "Options must precede actions.\n"
+ "Actions are executed in the order specified.\n"
+ "\nAvailable actions:\n"