[login] Use generic option-parsing library

Total cost: 7 bytes.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/hci/commands/login_cmd.c

@@ -1,28 +1,72 @@
+/*
+ * Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
 #include <string.h>
 #include <stdio.h>
 #include <ipxe/command.h>
+#include <ipxe/parseopt.h>
 #include <ipxe/login_ui.h>
 
 FILE_LICENCE ( GPL2_OR_LATER );
 
+/** @file
+ *
+ * Login commands
+ *
+ */
+
+/** "login" options */
+struct login_options {};
+
+/** "login" option list */
+static struct option_descriptor login_opts[] = {};
+
+/** "login" command descriptor */
+static struct command_descriptor login_cmd =
+	COMMAND_DESC ( struct login_options, login_opts, 0, 0,
+		       "", "Prompt for login credentials" );
+
+/**
+ * "login" command
+ *
+ * @v argc		Argument count
+ * @v argv		Argument list
+ * @ret rc		Return status code
+ */
 static int login_exec ( int argc, char **argv ) {
+	struct login_options opts;
 	int rc;
 
-	if ( argc > 1 ) {
-		printf ( "Usage: %s\n"
-			 "Prompt for login credentials\n", argv[0] );
-		return 1;
-	}
+	/* Parse options */
+	if ( ( rc = parse_options ( argc, argv, &login_cmd, &opts ) ) != 0 )
+		return rc;
 
+	/* Show login UI */
 	if ( ( rc = login_ui() ) != 0 ) {
 		printf ( "Could not set credentials: %s\n",
 			 strerror ( rc ) );
-		return 1;
+		return rc;
 	}
 
 	return 0;
 }
 
+/** Login commands */
 struct command login_command __command = {
 	.name = "login",
 	.exec = login_exec,