review fixes and a testcase

tests/test_blockarg.c

@@ -0,0 +1,51 @@
+/* test_blockarg.c - print and execute block argument  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2010  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/err.h>
+#include <grub/misc.h>
+#include <grub/i18n.h>
+#include <grub/extcmd.h>
+#include <grub/script_sh.h>
+
+static grub_err_t
+test_blockarg (grub_extcmd_context_t ctxt, int argc, char **args)
+{
+  if (! ctxt->script)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, "no block parameter");
+
+  grub_printf ("%s\n", args[argc - 1]);
+  grub_script_execute (ctxt->script);
+  return GRUB_ERR_NONE;
+}
+
+static grub_extcmd_t cmd;
+
+GRUB_MOD_INIT(test_blockarg)
+{
+  cmd = grub_register_extcmd ("test_blockarg", test_blockarg,
+			      GRUB_COMMAND_FLAG_BOTH | GRUB_COMMAND_FLAG_BLOCKS,
+			      N_("BLOCK"),
+			      N_("Print and execute block argument."), 0);
+}
+
+GRUB_MOD_FINI(test_blockarg)
+{
+  grub_unregister_extcmd (cmd);
+}