/* * 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 "Path.hxx" #include /** * Reader for directory entries. */ class DirectoryReader { DIR *const dirp; dirent *ent; public: /** * Creates new directory reader for the specified #dir. */ explicit DirectoryReader(const 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 (!Failed()) closedir(dirp); } /** * Checks if directory failed to open. */ bool Failed() const { return dirp == nullptr; } /** * Checks if directory entry is available. */ bool HasEntry() const { assert(!Failed()); return ent != nullptr; } /** * Reads next directory entry. */ bool ReadEntry() { assert(!Failed()); ent = readdir(dirp); return HasEntry(); } /** * Extracts directory entry that was previously read by #ReadEntry. */ Path GetEntry() const { assert(HasEntry()); return Path::FromFS(ent->d_name); } }; #endif