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     _fs = fs;
00047     return _fs->dir_open(&_dir, path);
00048 }
00049 
00050 int Dir::close()
00051 {
00052     if (!_fs) {
00053         return -EINVAL;
00054     }
00055 
00056     int err = _fs->dir_close(_dir);
00057     _fs = 0;
00058     return err;
00059 }
00060 
00061 ssize_t Dir::read(struct dirent *ent)
00062 {
00063     MBED_ASSERT(_fs);
00064     memset(ent, 0, sizeof(struct dirent));
00065     return _fs->dir_read(_dir, ent);
00066 }
00067 
00068 void Dir::seek(off_t offset)
00069 {
00070     MBED_ASSERT(_fs);
00071     return _fs->dir_seek(_dir, offset);
00072 }
00073 
00074 off_t Dir::tell()
00075 {
00076     MBED_ASSERT(_fs);
00077     return _fs->dir_tell(_dir);
00078 }
00079 
00080 void Dir::rewind()
00081 {
00082     MBED_ASSERT(_fs);
00083     return _fs->dir_rewind(_dir);
00084 }
00085 
00086 size_t Dir::size()
00087 {
00088     MBED_ASSERT(_fs);
00089     return _fs->dir_size(_dir);
00090 }