Dir.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2015 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "Dir.h"
00018 #include "mbed.h"
00019 #include <errno.h>
00020 
00021 
00022 Dir::Dir()
00023     : _fs(0), _dir(0)
00024 {
00025 }
00026 
00027 Dir::Dir(FileSystem *fs, const char *path)
00028     : _fs(0), _dir(0)
00029 {
00030     open(fs, path);
00031 }
00032 
00033 Dir::~Dir()
00034 {
00035     if (_fs) {
00036         close();
00037     }
00038 }
00039 
00040 int Dir::open(FileSystem *fs, const char *path)
00041 {
00042     if (_fs) {
00043         return -EINVAL;
00044     }
00045 
00046     int err = fs->dir_open(&_dir, path);
00047     if (!err) {
00048         _fs = fs;
00049     }
00050 
00051     return err;
00052 }
00053 
00054 int Dir::close()
00055 {
00056     if (!_fs) {
00057         return -EINVAL;
00058     }
00059 
00060     int err = _fs->dir_close(_dir);
00061     _fs = 0;
00062     return err;
00063 }
00064 
00065 ssize_t Dir::read(struct dirent *ent)
00066 {
00067     MBED_ASSERT(_fs);
00068     memset(ent, 0, sizeof(struct dirent));
00069     return _fs->dir_read(_dir, ent);
00070 }
00071 
00072 void Dir::seek(off_t offset)
00073 {
00074     MBED_ASSERT(_fs);
00075     return _fs->dir_seek(_dir, offset);
00076 }
00077 
00078 off_t Dir::tell()
00079 {
00080     MBED_ASSERT(_fs);
00081     return _fs->dir_tell(_dir);
00082 }
00083 
00084 void Dir::rewind()
00085 {
00086     MBED_ASSERT(_fs);
00087     return _fs->dir_rewind(_dir);
00088 }
00089 
00090 size_t Dir::size()
00091 {
00092     MBED_ASSERT(_fs);
00093     return _fs->dir_size(_dir);
00094 }