automake commit without merge history

grub-core/normal/autofs.c

@@ -0,0 +1,136 @@
+/* autofs.c - support auto-loading from fs.lst */
+/*
+ *  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/dl.h>
+#include <grub/env.h>
+#include <grub/misc.h>
+#include <grub/fs.h>
+#include <grub/normal.h>
+
+/* This is used to store the names of filesystem modules for auto-loading.  */
+static grub_named_list_t fs_module_list;
+
+/* The auto-loading hook for filesystems.  */
+static int
+autoload_fs_module (void)
+{
+  grub_named_list_t p;
+
+  while ((p = fs_module_list) != NULL)
+    {
+      if (! grub_dl_get (p->name) && grub_dl_load (p->name))
+	return 1;
+
+      if (grub_errno)
+	grub_print_error ();
+
+      fs_module_list = p->next;
+      grub_free (p->name);
+      grub_free (p);
+    }
+
+  return 0;
+}
+
+/* Read the file fs.lst for auto-loading.  */
+void
+read_fs_list (const char *prefix)
+{
+  if (prefix)
+    {
+      char *filename;
+
+      filename = grub_xasprintf ("%s/fs.lst", prefix);
+      if (filename)
+	{
+	  grub_file_t file;
+	  grub_fs_autoload_hook_t tmp_autoload_hook;
+
+	  /* This rules out the possibility that read_fs_list() is invoked
+	     recursively when we call grub_file_open() below.  */
+	  tmp_autoload_hook = grub_fs_autoload_hook;
+	  grub_fs_autoload_hook = NULL;
+
+	  file = grub_file_open (filename);
+	  if (file)
+	    {
+	      /* Override previous fs.lst.  */
+	      while (fs_module_list)
+		{
+		  grub_named_list_t tmp;
+		  tmp = fs_module_list->next;
+		  grub_free (fs_module_list);
+		  fs_module_list = tmp;
+		}
+
+	      while (1)
+		{
+		  char *buf;
+		  char *p;
+		  char *q;
+		  grub_named_list_t fs_mod;
+
+		  buf = grub_file_getline (file);
+		  if (! buf)
+		    break;
+
+		  p = buf;
+		  q = buf + grub_strlen (buf) - 1;
+
+		  /* Ignore space.  */
+		  while (grub_isspace (*p))
+		    p++;
+
+		  while (p < q && grub_isspace (*q))
+		    *q-- = '\0';
+
+		  /* If the line is empty, skip it.  */
+		  if (p >= q)
+		    continue;
+
+		  fs_mod = grub_malloc (sizeof (*fs_mod));
+		  if (! fs_mod)
+		    continue;
+
+		  fs_mod->name = grub_strdup (p);
+		  if (! fs_mod->name)
+		    {
+		      grub_free (fs_mod);
+		      continue;
+		    }
+
+		  fs_mod->next = fs_module_list;
+		  fs_module_list = fs_mod;
+		}
+
+	      grub_file_close (file);
+	      grub_fs_autoload_hook = tmp_autoload_hook;
+	    }
+
+	  grub_free (filename);
+	}
+    }
+
+  /* Ignore errors.  */
+  grub_errno = GRUB_ERR_NONE;
+
+  /* Set the hook.  */
+  grub_fs_autoload_hook = autoload_fs_module;
+}