Added opendir, readdir, closedir, etc.

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@62 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 106 insertions, 0 deletions

diff --git a/nuttx/fs/fs_telldir.c b/nuttx/fs/fs_telldir.c
new file mode 100644
index 000000000..781a46469
--- /dev/null
+++ b/nuttx/fs/fs_telldir.c
@@ -0,0 +1,106 @@
+/************************************************************
+ * fs_telldir.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <errno.h>
+#include <nuttx/fs.h>
+#include "fs_internal.h"
+
+/************************************************************
+ * Private Functions
+ ************************************************************/
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: telldir
+ *
+ * Description:
+ *   The telldir() function returns the current location
+ *   associated with the directory stream dirp.
+ *
+ * Inputs:
+ *   dirp -- An instance of type DIR created by a previous
+ *     call to opendir();
+ *
+ * Return:
+ *   On success, the telldir() function returns the current
+ *   location in the directory stream.  On error, -1 is
+ *   returned, and errno is set appropriately.
+ *
+ *   EBADF - Invalid directory stream descriptor dir
+ *
+ ************************************************************/
+
+#if CONFIG_NFILE_DESCRIPTORS > 0
+
+off_t telldir(FAR DIR *dirp)
+{
+  struct internal_dir_s *idir = (struct internal_dir_s *)dirp;
+  struct inode *curr;
+  off_t offs;
+
+  if (!idir)
+    {
+      *get_errno_ptr() = EBADF;
+      return -1;
+    }
+
+  /* Traverse the peer list starting at the 'root' of the
+   * the list until we find the 'next' node.  If devices
+   * are being registered and unregistered, then this can
+   * be a very unpredictable operation.
+   */
+
+  inode_semtake();
+  for (offs = 0, curr = idir->root;
+       curr && curr != idir->next;
+       offs++, curr = curr->i_peer);
+
+  /* We should have an offset now corresponding to idir->next.*/
+
+  inode_semgive();
+  return offs;
+}
+
+#endif /* CONFIG_NFILE_DESCRIPTORS */