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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_FS_DIRECTORY_READER_HXX
#define MPD_FS_DIRECTORY_READER_HXX
#include "check.h"
#include "AllocatedPath.hxx"
#include <dirent.h>
/**
* Reader for directory entries.
*/
class DirectoryReader {
DIR *const dirp;
dirent *ent;
public:
/**
* Creates new directory reader for the specified #dir.
*/
explicit DirectoryReader(Path dir)
: dirp(opendir(dir.c_str())),
ent(nullptr) {
}
DirectoryReader(const DirectoryReader &other) = delete;
DirectoryReader &operator=(const DirectoryReader &other) = delete;
/**
* Destroys this instance.
*/
~DirectoryReader() {
if (!HasFailed())
closedir(dirp);
}
/**
* Checks if directory failed to open.
*/
bool HasFailed() const {
return dirp == nullptr;
}
/**
* Checks if directory entry is available.
*/
bool HasEntry() const {
assert(!HasFailed());
return ent != nullptr;
}
/**
* Reads next directory entry.
*/
bool ReadEntry() {
assert(!HasFailed());
ent = readdir(dirp);
return HasEntry();
}
/**
* Extracts directory entry that was previously read by #ReadEntry.
*/
AllocatedPath GetEntry() const {
assert(HasEntry());
return AllocatedPath::FromFS(ent->d_name);
}
};
#endif
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