automake commit without merge history

grub-core/normal/dyncmd.c

@@ -0,0 +1,167 @@
+/* dyncmd.c - support dynamic 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/dl.h>
+#include <grub/mm.h>
+#include <grub/env.h>
+#include <grub/misc.h>
+#include <grub/command.h>
+#include <grub/normal.h>
+#include <grub/i18n.h>
+
+static grub_err_t
+grub_dyncmd_dispatcher (struct grub_command *cmd,
+			int argc, char **args)
+{
+  char *modname = cmd->data;
+  grub_dl_t mod;
+  grub_err_t ret;
+
+  mod = grub_dl_load (modname);
+  if (mod)
+    {
+      char *name;
+
+      grub_free (modname);
+      grub_dl_ref (mod);
+
+      name = (char *) cmd->name;
+      grub_unregister_command (cmd);
+
+      cmd = grub_command_find (name);
+      if (cmd)
+	ret = (cmd->func) (cmd, argc, args);
+      else
+	ret = grub_errno;
+
+      grub_free (name);
+    }
+  else
+    ret = grub_errno;
+
+  return ret;
+}
+
+/* Read the file command.lst for auto-loading.  */
+void
+read_command_list (const char *prefix)
+{
+  if (prefix)
+    {
+      char *filename;
+
+      filename = grub_xasprintf ("%s/command.lst", prefix);
+      if (filename)
+	{
+	  grub_file_t file;
+
+	  file = grub_file_open (filename);
+	  if (file)
+	    {
+	      char *buf = NULL;
+	      grub_command_t ptr, last = 0, next;
+
+	      /* Override previous commands.lst.  */
+	      for (ptr = grub_command_list; ptr; ptr = next)
+		{
+		  next = ptr->next;
+		  if (ptr->func == grub_dyncmd_dispatcher)
+		    {
+		      if (last)
+			last->next = ptr->next;
+		      else
+			grub_command_list = ptr->next;
+		      grub_free (ptr);
+		    }
+		  else
+		    last = ptr;
+		}
+
+	      for (;; grub_free (buf))
+		{
+		  char *p, *name, *modname;
+		  grub_command_t cmd;
+		  int prio = 0;
+
+		  buf = grub_file_getline (file);
+
+		  if (! buf)
+		    break;
+
+		  name = buf;
+		  if (*name == '*')
+		    {
+		      name++;
+		      prio++;
+		    }
+
+		  if (! grub_isgraph (name[0]))
+		    continue;
+
+		  p = grub_strchr (name, ':');
+		  if (! p)
+		    continue;
+
+		  *p = '\0';
+		  while (*++p == ' ')
+		    ;
+
+		  if (! grub_isgraph (*p))
+		    continue;
+
+		  if (grub_dl_get (p))
+		    continue;
+
+		  name = grub_strdup (name);
+		  if (! name)
+		    continue;
+
+		  modname = grub_strdup (p);
+		  if (! modname)
+		    {
+		      grub_free (name);
+		      continue;
+		    }
+
+		  cmd = grub_register_command_prio (name,
+						    grub_dyncmd_dispatcher,
+						    0, N_("not loaded"), prio);
+		  if (! cmd)
+		    {
+		      grub_free (name);
+		      grub_free (modname);
+		      continue;
+		    }
+		  cmd->flags |= GRUB_COMMAND_FLAG_DYNCMD;
+		  cmd->data = modname;
+
+		  /* Update the active flag.  */
+		  grub_command_find (name);
+		}
+
+	      grub_file_close (file);
+	    }
+
+	  grub_free (filename);
+	}
+    }
+
+  /* Ignore errors.  */
+  grub_errno = GRUB_ERR_NONE;
+}