automake commit without merge history

grub-core/commands/extcmd.c

@@ -0,0 +1,96 @@
+/* extcmd.c - support extended command */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  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/mm.h>
+#include <grub/list.h>
+#include <grub/misc.h>
+#include <grub/extcmd.h>
+
+static grub_err_t
+grub_extcmd_dispatcher (struct grub_command *cmd,
+			int argc, char **args)
+{
+  int new_argc;
+  char **new_args;
+  struct grub_arg_option *parser;
+  struct grub_arg_list *state;
+  int maxargs = 0;
+  grub_err_t ret;
+  grub_extcmd_t ext;
+
+  ext = cmd->data;
+  parser = (struct grub_arg_option *) ext->options;
+  while (parser && (parser++)->doc)
+    maxargs++;
+
+  /* Set up the option state.  */
+  state = grub_zalloc (sizeof (struct grub_arg_list) * maxargs);
+
+  if (grub_arg_parse (ext, argc, args, state, &new_args, &new_argc))
+    {
+      ext->state = state;
+      ret = (ext->func) (ext, new_argc, new_args);
+      grub_free (new_args);
+    }
+  else
+    ret = grub_errno;
+
+  grub_free (state);
+
+  return ret;
+}
+
+grub_extcmd_t
+grub_register_extcmd (const char *name, grub_extcmd_func_t func,
+		      unsigned flags, const char *summary,
+		      const char *description,
+		      const struct grub_arg_option *parser)
+{
+  grub_extcmd_t ext;
+  grub_command_t cmd;
+
+  ext = (grub_extcmd_t) grub_malloc (sizeof (*ext));
+  if (! ext)
+    return 0;
+
+  cmd = grub_register_command_prio (name, grub_extcmd_dispatcher,
+				    summary, description, 1);
+  if (! cmd)
+    {
+      grub_free (ext);
+      return 0;
+    }
+
+  cmd->flags = (flags | GRUB_COMMAND_FLAG_EXTCMD);
+  cmd->data = ext;
+
+  ext->cmd = cmd;
+  ext->func = func;
+  ext->options = parser;
+  ext->data = 0;
+
+  return ext;
+}
+
+void
+grub_unregister_extcmd (grub_extcmd_t ext)
+{
+  grub_unregister_command (ext->cmd);
+  grub_free (ext);
+}