osdir.hh

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/**
 * Copyright (C) 2002 Bart Vanhauwaert
 *
 * Permission to use, copy, modify, distribute and sell this software
 * for any purpose is hereby granted without fee. This license
 * includes (but is not limited to) standalone compilation or as part
 * of a larger project.
 *
 * This software is provided "as is" without express or implied warranty.
 *
 * For a full statement on warranty and terms and conditions for
 * copying, distribution and modification, please see the comment block
 * at the end of this file.
 *
 * Version 1
 *
 */

#ifndef OSLINK_OSDIR_HEADER_H_
#define OSLINK_OSDIR_HEADER_H_

#if defined(unix) || defined(__unix) || defined(__unix__)
#define OSLINK_OSDIR_POSIX
#elif defined(_WIN32)
#define OSLINK_OSDIR_WINDOWS
#else
#define OSLINK_OSDIR_NOTSUPPORTED
#endif

#include <string>

#if defined(OSLINK_OSDIR_NOTSUPPORTED)

namespace oslink
{
    class directory
    {
        public:
            directory(const std::string&)       { }
            operator void*() const              { return (void*)0; }
            std::string next()                  { return ""; }
    };
}

#elif defined(OSLINK_OSDIR_POSIX)

#include <sys/types.h>
#include <dirent.h>

namespace oslink
{
    class directory
    {
        public:
            directory(const std::string& aName)
                : handle(opendir(aName.c_str())), willfail(false)
                {
                    if (!handle)
                        willfail = true;
                    else
                    {
                        dirent* entry = readdir(handle);
                        if (entry)
                            current = entry->d_name;
                        else
                            willfail = true;
                    }
                }
            ~directory()
                {
                    if (handle)
                        closedir(handle);
                }
            operator void*() const
                {
                    return willfail ? (void*)0:(void*)(-1);
                }
            std::string next()
                {
                    std::string prev(current);
                    dirent* entry = readdir(handle);
                    if (entry)
                        current = entry->d_name;
                    else
                        willfail = true;
                    return prev;
                }
        private:
            DIR* handle;
            bool willfail;
            std::string current;
    };
}

#elif defined(OSLINK_OSDIR_WINDOWS)

#include <windows.h>
#include <winbase.h>

namespace oslink
{
    class directory
    {
        public:
            directory(const std::string& aName)
                : handle(INVALID_HANDLE_VALUE), willfail(false)
                {
                    // First check the attributes trying to access a non-directory with 
                    // FindFirstFile takes ages
                    DWORD attrs = GetFileAttributes(aName.c_str());
                    if ( (attrs == 0xFFFFFFFF) || ((attrs && FILE_ATTRIBUTE_DIRECTORY) == 0) )
                    {
                        willfail = true;
                        return;
                    }
                    std::string Full(aName);
                    // Circumvent a problem in FindFirstFile with c:\\* as parameter 
                    if ( (Full.length() > 0) && (Full[Full.length()-1] != '\\') )
                        Full += "\\";
                    WIN32_FIND_DATA entry;
                    handle = FindFirstFile( (Full+"*").c_str(), &entry);
                    if (handle == INVALID_HANDLE_VALUE)
                        willfail = true;
                    else
                        current = entry.cFileName;
                }
            ~directory()
                {
                    if (handle != INVALID_HANDLE_VALUE)
                        FindClose(handle);
                }

            operator void*() const              
                {
                    return willfail ? (void*)0:(void*)(-1);
                }
            std::string next()
                {
                    std::string prev = current;
                    WIN32_FIND_DATA entry;
                    int ok = FindNextFile(handle, &entry);
                    if (!ok)
                        willfail = true;
                    else
                        current = entry.cFileName;
                    return current; 
                }
        private:
            HANDLE  handle;
            bool    willfail;
            std::string current;
    };
}


#endif

#endif

/**
 *
 * The "library", below, refers to the collection of software functions
 * and/or data contained in this file, prepared so as to be conveniently
 * compiled and linked with application programs (which use some of those
 * functions and data) to form executables.
 *
 *                             NO WARRANTY
 *
 * 1. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
 * WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
 * EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
 * OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
 * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
 * LIBRARY IS WITH YOU.  SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
 *
 * 2. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
 * WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
 * AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
 * FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
 * CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
 * LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
 * RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
 * FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
 * SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * END OF TERMS AND CONDITIONS
 *
 */