directory_nix.h

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#ifndef DIRECTORY_NIX_H
#define DIRECTORY_NIX_H
#pragma once
/***************************************************************************
 *   Copyright (C) 2007-2013 Mike Kinghan, imk@burroingroingjoing.com      *
 *   All rights reserved.                                                  *
 *                                                                         *
 *   Contributed originally by Mike Kinghan, imk@burroingroingjoing.com    *
 *                                                                         *
 *   Redistribution and use in source and binary forms, with or without    *
 *   modification, are permitted provided that the following conditions    *
 *   are met:                                                              *
 *                                                                         *
 *   Redistributions of source code must retain the above copyright        *
 *   notice, this list of conditions and the following disclaimer.         *
 *                                                                         *
 *   Redistributions in binary form must reproduce the above copyright     *
 *   notice, this list of conditions and the following disclaimer in the   *
 *   documentation and/or other materials provided with the distribution.  *
 *                                                                         *
 *   Neither the name of Mike Kinghan nor the names of its contributors    *
 *   may be used to endorse or promote products derived from this software *
 *   without specific prior written permission.                            *
 *                                                                         *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS   *
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT     *
 *   LIMITED TO, THE IMPLIED WARRANTIES OF  MERCHANTABILITY AND FITNESS    *
 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE        *
 *   COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,   *
 *   INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,  *
 *   BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS *
 *   OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED    *
 *   AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,*
 *   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF *
 *   THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH  *
 *   DAMAGE.                                                               *
 *                                                                         *
 **************************************************************************/
#include "prohibit.h"
#include "directory_common.h"
#include <dirent.h>
#include <cerrno>

namespace nix
{

struct directory : common::directory, private no_copy {
        explicit directory(std::string const & path)
                : common::directory(path),_dir(nullptr) {
                open();
        }

        ~directory() {
                close();
        }

        std::string const cur_memb() const {
                return _entry.d_name;
        }

        bool open() {
                _dir = opendir(_abs_path.c_str());
                return !_dir ? !(_last_error = errno) : true;
        }

        bool close() {
                return (_dir && closedir(_dir) != 0) ? !(_last_error = errno) : true;
        }

        std::string  next() {
                struct dirent * entry = nullptr;
                _entry.d_name[0] = '\0';
                int error = readdir_r(_dir,&_entry,&entry);
                if (error) {
                        _last_error = error;
                } else if (entry) {
                        if (is_dot_name(_entry.d_name)) {
                                return next();
                        }
                }
                return _entry.d_name;
        }

private:

        DIR * _dir;
        struct dirent _entry;
};

} //namespace nix

#endif