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#include "qplatformdefs.h"

#include "qfsfileengine_iterator_p.h"

#include <QtCore/qvariant.h>

#ifndef QT_NO_FSFILEENGINE

QT_BEGIN_NAMESPACE

class QFSFileEngineIteratorPlatformSpecificData

{

public:

    inline QFSFileEngineIteratorPlatformSpecificData()

        : dir(0), dirEntry(0), done(false)

#if defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_CYGWIN)

          , mt_file(0)

#endif

    { }

    DIR *dir;

    dirent *dirEntry;

    bool done;

#if defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_CYGWIN)

    // for readdir_r

    dirent *mt_file;

#endif

};

void QFSFileEngineIterator::advance()

{

    currentEntry = platform->dirEntry ? QFile::decodeName(QByteArray(platform->dirEntry->d_name)) : QString();

    if (!platform->dir)

        return;

#if defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_CYGWIN)

    if (::readdir_r(platform->dir, platform->mt_file, &platform->dirEntry) != 0)

        platform->done = true;

#else

    // ### add local lock to prevent breaking reentrancy

    platform->dirEntry = ::readdir(platform->dir);

#endif // _POSIX_THREAD_SAFE_FUNCTIONS

    if (!platform->dirEntry) {

        ::closedir(platform->dir);

        platform->dir = 0;

        platform->done = true;

#if defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_CYGWIN)

        delete [] platform->mt_file;

        platform->mt_file = 0;

#endif

    }

}

void QFSFileEngineIterator::newPlatformSpecifics()

{

    platform = new QFSFileEngineIteratorPlatformSpecificData;

}

void QFSFileEngineIterator::deletePlatformSpecifics()

{

    if (platform->dir) {

        ::closedir(platform->dir);

#if defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_CYGWIN)

        delete [] platform->mt_file;

        platform->mt_file = 0;

#endif

    }

    delete platform;

    platform = 0;

}

bool QFSFileEngineIterator::hasNext() const

{

    if (!platform->done && !platform->dir) {

        QFSFileEngineIterator *that = const_cast<QFSFileEngineIterator *>(this);

        if ((that->platform->dir = ::opendir(QFile::encodeName(path()).data())) == 0) {

            that->platform->done = true;

        } else {

            // ### Race condition; we should use fpathconf and dirfd().

            long maxPathName = ::pathconf(QFile::encodeName(path()).data(), _PC_NAME_MAX);

            if ((int) maxPathName == -1)

                maxPathName = FILENAME_MAX;

            maxPathName += sizeof(dirent) + 1;

#if defined(_POSIX_THREAD_SAFE_FUNCTIONS) && !defined(Q_OS_CYGWIN)

            if (that->platform->mt_file)

                delete [] that->platform->mt_file;

            that->platform->mt_file = (dirent *)new char[maxPathName];

#endif

            that->advance();

        }

    }

    return !platform->done;

}

QT_END_NAMESPACE

#endif // QT_NO_FSFILEENGINE