1 /****************************************************************************
2 * fs/dirent/fs_telldir.c
3 *
4 * Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved.
5 * Author: Gregory Nutt <gnutt@nuttx.org>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name NuttX nor the names of its contributors may be
18 * used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
28 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
31 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 *
34 ****************************************************************************/
35
36 /****************************************************************************
37 * Included Files
38 ****************************************************************************/
39 #include "vfs_config.h"
40
41 #include "sys/types.h"
42 #include "dirent.h"
43 #include "errno.h"
44
45 #include "fs/dirent_fs.h"
46
47
48 /****************************************************************************
49 * Public Functions
50 ****************************************************************************/
51
52 /****************************************************************************
53 * Name: telldir
54 *
55 * Description:
56 * The telldir() function returns the current location
57 * associated with the directory stream dirp.
58 *
59 * Inputs:
60 * dirp -- An instance of type DIR created by a previous
61 * call to opendir();
62 *
63 * Return:
64 * On success, the telldir() function returns the current
65 * location in the directory stream. On error, -1 is
66 * returned, and errno is set appropriately.
67 *
68 * EBADF - Invalid directory stream descriptor dir
69 *
70 ****************************************************************************/
71
telldir(DIR * dirp)72 long telldir(DIR *dirp)
73 {
74 struct fs_dirent_s *idir = (struct fs_dirent_s *)dirp;
75
76 if (!idir || !idir->fd_root)
77 {
78 set_errno(EBADF);
79 return (off_t)-1;
80 }
81
82 /* Just return the current position */
83
84 return idir->fd_position;
85 }
86
87