automake commit without merge history

grub-core/kern/emu/hostfs.c

@@ -0,0 +1,175 @@
+/* hostfs.c - Dummy filesystem to provide access to the hosts filesystem  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007,2008,2009,2010  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/>.
+ */
+#define _BSD_SOURCE
+#include <grub/fs.h>
+#include <grub/file.h>
+#include <grub/disk.h>
+#include <grub/misc.h>
+#include <grub/dl.h>
+#include <grub/util/misc.h>
+
+#include <dirent.h>
+#include <stdio.h>
+#include <errno.h>
+
+
+/* dirent.d_type is a BSD extension, not part of POSIX */
+#include <sys/stat.h>
+#include <string.h>
+
+static int
+is_dir (const char *path, const char *name)
+{
+  int len1 = strlen(path);
+  int len2 = strlen(name);
+
+  char pathname[len1 + 1 + len2 + 1 + 13];
+  strcpy (pathname, path);
+
+  /* Avoid UNC-path "//name" on Cygwin.  */
+  if (len1 > 0 && pathname[len1 - 1] != '/')
+    strcat (pathname, "/");
+
+  strcat (pathname, name);
+
+  struct stat st;
+  if (stat (pathname, &st))
+    return 0;
+  return S_ISDIR (st.st_mode);
+}
+
+static grub_err_t
+grub_hostfs_dir (grub_device_t device, const char *path,
+		 int (*hook) (const char *filename,
+			      const struct grub_dirhook_info *info))
+{
+  DIR *dir;
+
+  /* Check if the disk is our dummy disk.  */
+  if (grub_strcmp (device->disk->name, "host"))
+    return grub_error (GRUB_ERR_BAD_FS, "not a hostfs");
+
+  dir = opendir (path);
+  if (! dir)
+    return grub_error (GRUB_ERR_BAD_FILENAME,
+		       "can't open the hostfs directory `%s'", path);
+
+  while (1)
+    {
+      struct dirent *de;
+      struct grub_dirhook_info info;
+      grub_memset (&info, 0, sizeof (info));
+
+      de = readdir (dir);
+      if (! de)
+	break;
+
+      info.dir = !! is_dir (path, de->d_name);
+      hook (de->d_name, &info);
+
+    }
+
+  closedir (dir);
+
+  return GRUB_ERR_NONE;
+}
+
+/* Open a file named NAME and initialize FILE.  */
+static grub_err_t
+grub_hostfs_open (struct grub_file *file, const char *name)
+{
+  FILE *f;
+
+  f = fopen (name, "rb");
+  if (! f)
+    return grub_error (GRUB_ERR_BAD_FILENAME,
+		       "can't open `%s'", name);
+  file->data = f;
+
+#ifdef __MINGW32__
+  file->size = grub_util_get_disk_size (name);
+#else
+  fseeko (f, 0, SEEK_END);
+  file->size = ftello (f);
+  fseeko (f, 0, SEEK_SET);
+#endif
+
+  return GRUB_ERR_NONE;
+}
+
+static grub_ssize_t
+grub_hostfs_read (grub_file_t file, char *buf, grub_size_t len)
+{
+  FILE *f;
+
+  f = (FILE *) file->data;
+  if (fseeko (f, file->offset, SEEK_SET) != 0)
+    {
+      grub_error (GRUB_ERR_OUT_OF_RANGE, "fseeko: %s", strerror (errno));
+      return -1;
+    }
+
+  unsigned int s = fread (buf, 1, len, f);
+  if (s != len)
+    grub_error (GRUB_ERR_FILE_READ_ERROR, "fread: %s", strerror (errno));
+
+  return (signed) s;
+}
+
+static grub_err_t
+grub_hostfs_close (grub_file_t file)
+{
+  FILE *f;
+
+  f = (FILE *) file->data;
+  fclose (f);
+
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_hostfs_label (grub_device_t device __attribute ((unused)),
+		   char **label __attribute ((unused)))
+{
+  *label = 0;
+  return GRUB_ERR_NONE;
+}
+
+static struct grub_fs grub_hostfs_fs =
+  {
+    .name = "hostfs",
+    .dir = grub_hostfs_dir,
+    .open = grub_hostfs_open,
+    .read = grub_hostfs_read,
+    .close = grub_hostfs_close,
+    .label = grub_hostfs_label,
+    .next = 0
+  };
+
+
+
+GRUB_MOD_INIT(hostfs)
+{
+  grub_fs_register (&grub_hostfs_fs);
+}
+
+GRUB_MOD_FINI(hostfs)
+{
+  grub_fs_unregister (&grub_hostfs_fs);
+}