diff options
Diffstat (limited to 'nuttx/lib/dirent/lib_telldir.c')
-rw-r--r-- | nuttx/lib/dirent/lib_telldir.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/nuttx/lib/dirent/lib_telldir.c b/nuttx/lib/dirent/lib_telldir.c new file mode 100644 index 000000000..3753b326e --- /dev/null +++ b/nuttx/lib/dirent/lib_telldir.c @@ -0,0 +1,91 @@ +/**************************************************************************** + * lib/dirent/fs_telldir.c + * + * Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 NuttX 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/fs.h> +#include <nuttx/fs/dirent.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 + * + ****************************************************************************/ + +off_t telldir(FAR DIR *dirp) +{ + struct fs_dirent_s *idir = (struct fs_dirent_s *)dirp; + + if (!idir || !idir->fd_root) + { + set_errno(EBADF); + return (off_t)-1; + } + + /* Just return the current position */ + + return idir->fd_position; +} + |