/**************************************************************************** * fs/dirent/fs_rewinddir.c * * Copyright (C) 2007-2009, 2011, 2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 "vfs_config.h" #include "dirent.h" #include "errno.h" #include "fs/dirent_fs.h" #include "vnode.h" /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: rewinddir * * Description: * The rewinddir() function resets the position of the * directory stream dir to the beginning of the directory. * * Input Parameters: * dirp -- An instance of type DIR created by a previous * call to opendir(); * * Returned Value: * None * ****************************************************************************/ void rewinddir(DIR *dirp) { struct fs_dirent_s *idir = (struct fs_dirent_s *)dirp; struct Vnode *vnode_ptr = NULL; if (!idir || !idir->fd_root || idir->fd_status != DIRENT_MAGIC) { set_errno(EBADF); return; } /* The way we handle the readdir depends on the type of vnode * that we are dealing with. */ vnode_ptr = idir->fd_root; if (vnode_ptr->vop != NULL && vnode_ptr->vop->Rewinddir != NULL) { /* Perform the rewinddir() operation */ vnode_ptr->vop->Rewinddir(vnode_ptr, idir); } else { set_errno(ENOSYS); } /* Reset position for telldir() */ idir->fd_position = 0; }