mbed-os/features/storage/filesystem/Dir.cpp

/* mbed Microcontroller Library
 * Copyright (c) 2015 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "Dir.h"
#include <errno.h>

namespace mbed {

Dir::Dir()
    : _fs(0), _dir(0)
{
}

Dir::Dir(FileSystem *fs, const char *path)
    : _fs(0), _dir(0)
{
    open(fs, path);
}

Dir::~Dir()
{
    if (_fs) {
        close();
    }
}

int Dir::open(FileSystem *fs, const char *path)
{
    if (_fs) {
        return -EINVAL;
    }

    int err = fs->dir_open(&_dir, path);
    if (!err) {
        _fs = fs;
    }

    return err;
}

int Dir::close()
{
    if (!_fs) {
        return -EINVAL;
    }

    int err = _fs->dir_close(_dir);
    _fs = 0;
    return err;
}

ssize_t Dir::read(struct dirent *ent)
{
    MBED_ASSERT(_fs);
    memset(ent, 0, sizeof(struct dirent));
    return _fs->dir_read(_dir, ent);
}

void Dir::seek(off_t offset)
{
    MBED_ASSERT(_fs);
    return _fs->dir_seek(_dir, offset);
}

off_t Dir::tell()
{
    MBED_ASSERT(_fs);
    return _fs->dir_tell(_dir);
}

void Dir::rewind()
{
    MBED_ASSERT(_fs);
    return _fs->dir_rewind(_dir);
}

size_t Dir::size()
{
    MBED_ASSERT(_fs);
    return _fs->dir_size(_dir);
}

} // namespace mbed