1 /**************************************************************************** 2 * fs/dirent/fs_rewinddir.c 3 * 4 * Copyright (c) 2023 Huawei Device Co., Ltd. All rights reserved. 5 * Based on NuttX originally from nuttx source (nuttx/fs/ and nuttx/drivers/) 6 * 7 * Licensed under the Apache License, Version 2.0 (the "License"); 8 * you may not use this file except in compliance with the License. 9 * You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 * 19 ****************************************************************************/ 20 21 /**************************************************************************** 22 * Included Files 23 ****************************************************************************/ 24 25 #include "vfs_config.h" 26 #include "dirent.h" 27 #include "errno.h" 28 #include "fs/dirent_fs.h" 29 #include "vnode.h" 30 31 /**************************************************************************** 32 * Public Functions 33 ****************************************************************************/ 34 35 /**************************************************************************** 36 * Name: rewinddir 37 * 38 * Description: 39 * The rewinddir() function resets the position of the 40 * directory stream dir to the beginning of the directory. 41 * 42 * Input Parameters: 43 * dirp -- An instance of type DIR created by a previous 44 * call to opendir(); 45 * 46 * Returned Value: 47 * None 48 * 49 ****************************************************************************/ 50 rewinddir(DIR * dirp)51void rewinddir(DIR *dirp) 52 { 53 struct fs_dirent_s *idir = (struct fs_dirent_s *)dirp; 54 struct Vnode *vnode_ptr = NULL; 55 56 if (!idir || !idir->fd_root || idir->fd_status != DIRENT_MAGIC) 57 { 58 set_errno(EBADF); 59 return; 60 } 61 62 /* The way we handle the readdir depends on the type of vnode 63 * that we are dealing with. 64 */ 65 66 vnode_ptr = idir->fd_root; 67 if (vnode_ptr->vop != NULL && vnode_ptr->vop->Rewinddir != NULL) 68 { 69 /* Perform the rewinddir() operation */ 70 71 vnode_ptr->vop->Rewinddir(vnode_ptr, idir); 72 } 73 else 74 { 75 set_errno(ENOSYS); 76 } 77 78 /* Reset position for telldir() */ 79 80 idir->fd_position = 0; 81 } 82