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posix-fs.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2002-2005 The ScummVM project
 *
 * 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.
 *
 * $Header: /cvsroot/scummvm/scummvm/backends/fs/posix/posix-fs.cpp,v 1.25.2.1 2005/10/18 02:11:16 sev Exp $
 */

#if defined(UNIX) || defined(__DC__)

#include "common/stdafx.h"

#include "../fs.h"

#ifdef MACOSX
#include <sys/types.h>
#endif
#include <sys/param.h>
#include <sys/stat.h>
#ifndef __DC__
#include <dirent.h>
#endif
#include <stdio.h>
#include <unistd.h>

/*
 * Implementation of the ScummVM file system API based on POSIX.
 */

class POSIXFilesystemNode : public AbstractFilesystemNode {
protected:
      String _displayName;
      bool _isDirectory;
      bool _isValid;
      String _path;

public:
      POSIXFilesystemNode();
      POSIXFilesystemNode(const String &path);
      POSIXFilesystemNode(const POSIXFilesystemNode *node);

      virtual String displayName() const { return _displayName; }
      virtual bool isValid() const { return _isValid; }
      virtual bool isDirectory() const { return _isDirectory; }
      virtual String path() const { return _path; }

      virtual FSList listDir(ListMode mode = kListDirectoriesOnly) const;
      virtual AbstractFilesystemNode *parent() const;
};


static const char *lastPathComponent(const Common::String &str) {
      const char *start = str.c_str();
      const char *cur = start + str.size() - 2;

      while (cur > start && *cur != '/') {
            --cur;
      }

      return cur+1;
}

AbstractFilesystemNode *FilesystemNode::getRoot() {
      return new POSIXFilesystemNode();
}

AbstractFilesystemNode *FilesystemNode::getNodeForPath(const String &path) {
      return new POSIXFilesystemNode(path);
}

POSIXFilesystemNode::POSIXFilesystemNode() {
#ifndef __DC__
      char buf[MAXPATHLEN];
      getcwd(buf, MAXPATHLEN);

      _path = buf;
      _displayName = lastPathComponent(_path);
      _path += '/';
#else
      _path = "/";
      _displayName = _path;
#endif
      _isValid = true;
      _isDirectory = true;
}

POSIXFilesystemNode::POSIXFilesystemNode(const String &p) {
      int len = 0, offset = p.size();
      struct stat st;

      assert(offset > 0);

      _path = p;

      // Extract last component from path
      const char *str = p.c_str();
      while (offset > 0 && str[offset-1] == '/')
            offset--;
      while (offset > 0 && str[offset-1] != '/') {
            len++;
            offset--;
      }
      _displayName = String(str + offset, len);

      // Check whether it is a directory, and whether the file actually exists
#ifdef __DC__
      _isValid = true;
      _isDirectory = true;
#else
      _isValid = (0 == stat(_path.c_str(), &st));
      _isDirectory = S_ISDIR(st.st_mode);
#endif
}

POSIXFilesystemNode::POSIXFilesystemNode(const POSIXFilesystemNode *node) {
      _displayName = node->_displayName;
      _isValid = node->_isValid;
      _isDirectory = node->_isDirectory;
      _path = node->_path;
}

FSList POSIXFilesystemNode::listDir(ListMode mode) const {
      assert(_isDirectory);
      DIR *dirp = opendir(_path.c_str());
      struct stat st;

      struct dirent *dp;
      FSList myList;

      if (dirp == NULL)
            return myList;

      // ... loop over dir entries using readdir
      while ((dp = readdir(dirp)) != NULL) {
            // Skip 'invisible' files
            if (dp->d_name[0] == '.')
                  continue;

            POSIXFilesystemNode entry;
            entry._displayName = dp->d_name;
            entry._path = _path;
            if (entry._path.lastChar() != '/')
                  entry._path += '/';
            entry._path += dp->d_name;

#ifdef __DC__
            entry._isDirectory = dp->d_size < 0;
#else
            if (stat(entry._path.c_str(), &st))
                  continue;
            entry._isDirectory = S_ISDIR(st.st_mode);
#endif

            // Honor the chosen mode
            if ((mode == kListFilesOnly && entry._isDirectory) ||
                  (mode == kListDirectoriesOnly && !entry._isDirectory))
                  continue;

            if (entry._isDirectory)
                  entry._path += "/";
            myList.push_back(wrap(new POSIXFilesystemNode(&entry)));
      }
      closedir(dirp);
      return myList;
}

AbstractFilesystemNode *POSIXFilesystemNode::parent() const {
      if (_path == "/")
            return 0;

      POSIXFilesystemNode *p = new POSIXFilesystemNode();
      const char *start = _path.c_str();
      const char *end = lastPathComponent(_path);

      p->_path = String(start, end - start);
      p->_displayName = lastPathComponent(p->_path);

      p->_isValid = true;
      p->_isDirectory = true;

      return p;
}

#endif // defined(UNIX)

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