source: trunk/yat/utility/FileIO.cc @ 709

// $Id: FileIO.cc 709 2006-12-20 21:49:02Z jari $

/*
  Copyright (C) 2004 Jari Häkkinen
  Copyright (C) 2005 Peter Johansson
  Copyright (C) 2006 Jari Häkkinen

  This file is part of the yat library, http://lev.thep.lu.se/trac/yat

  The yat library 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.

  The yat library 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., 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.
*/

#include "FileIO.h"

#include <cerrno>
#include <iostream>
#include <string>

#include <sys/stat.h>
#include <unistd.h>


namespace theplu {
namespace yat {
namespace utility {


  FileIO::FileIO(const std::string& path)
    : no_file_(false), path_(path)
  {
    if ( stat(path_.c_str(),&stat_) && !(no_file_=(errno==ENOENT)) )
        throw IO_error(std::string("stat(2) call failed with errno: "+errno));
  }


  int FileIO::access_rights(const std::string& path,
                            const std::string& bits) const
  {
    std::string tryme=path_;
    if (no_file_) {
      std::string::size_type pos=path_.find_last_of('/');
      tryme = ( (pos!=std::string::npos) ? path_.substr(0,pos) : "." );
    }

    int mode=0;
    for (u_int i=0; i<bits.length(); i++)
      switch (bits[i]) {
          case 'r':
            mode|=R_OK;
            break;
          case 'w':
            mode|=W_OK;
            break;
          case 'x':
            mode|=X_OK;
            break;
      }

    return access(tryme.c_str(),mode);
  }


  bool FileIO::file_exists(const std::string& file) const
  {
    return !no_file_;
  }


  const std::string& FileIO::path(void) const
  {
    return path_;
  }

}}} // of namespace utility, yat, and theplu