/* This file is part of the KDE libraries
   Copyright (C) 1999 Sirtaj Singh Kang <taj@kde.org>
   Copyright (C) 1999,2007 Stephan Kulow <coolo@kde.org>
   Copyright (C) 1999 Waldo Bastian <bastian@kde.org>
   Copyright (C) 2009 David Faure <faure@kde.org>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.

   This 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

/*
 * Author: Stephan Kulow <coolo@kde.org> and Sirtaj Singh Kang <taj@kde.org>
 * Generated: Thu Mar  5 16:05:28 EST 1998
 */

#include "kstandarddirs.h"
#include "kconfig.h"
#include "kconfiggroup.h"
#include "kdebug.h"
#include "kglobal.h"
#include "kshell.h"
#include "kuser.h"
#include "kde_file.h"
#include "kkernel_win.h"
#include "kkernel_mac.h"
#include "klocalizedstring.h"
#include <kservice_export.h>

#include <config-kstandarddirs.h>
#include <config-kdelibs4support.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <dirent.h>
#include <pwd.h>
#include <grp.h>
#ifdef Q_OS_WIN
#include <windows.h>
#ifdef _WIN32_WCE
#include <basetyps.h>
#endif
#ifdef Q_OS_WIN64
// FIXME: did not find a reliable way to fix with kdewin mingw header
#define interface struct
#endif
#include <shlobj.h>
#include <QtCore/QVarLengthArray>
#endif

#include <QtCore/QMutex>
#include <QtCore/QRegExp>
#include <QtCore/QDir>
#include <QtCore/QFileInfo>
#include <QtCore/QSettings>
#include <QCoreApplication>

#ifndef MAXPATHLEN
# define MAXPATHLEN 4096
#endif

#ifdef Q_OS_WIN
static const Qt::CaseSensitivity cs = Qt::CaseInsensitive;
#else
static const Qt::CaseSensitivity cs = Qt::CaseSensitive;
#endif

class Q_DECL_HIDDEN KStandardDirs::KStandardDirsPrivate
{
public:
    KStandardDirsPrivate(KStandardDirs *qq)
        : m_restrictionsActive(false),
          m_checkRestrictions(true),
          m_cacheMutex(QMutex::Recursive), // resourceDirs is recursive
          q(qq)
    { }

    bool hasDataRestrictions(const QString &relPath) const;
    QStringList resourceDirs(const char *type, const QString &subdirForRestrictions);

    bool m_restrictionsActive : 1;
    bool m_checkRestrictions : 1;
    QMap<QByteArray, bool> m_restrictions;

    QStringList xdgdata_prefixes;
    QStringList xdgconf_prefixes;
    QStringList m_prefixes;

    // Directory dictionaries
    QMap<QByteArray, QStringList> m_absolutes; // For each resource type, the list of absolute paths, from most local (most priority) to most global
    QMap<QByteArray, QStringList> m_relatives; // Same with relative paths
    // The search path is "all relative paths" < "all absolute paths", from most priority to least priority.

    // Caches (protected by mutex in const methods, cf ctor docu)
    QMap<QByteArray, QStringList> m_dircache;
    QMap<QByteArray, QString> m_savelocations;
    QMutex m_cacheMutex;

    KStandardDirs *q;
};

/* If you add a new resource type here, make sure to
 * 1) regenerate using "kdesdk/scripts/generate_string_table.pl types < tmpfile" with the data below
 *        in tmpfile (no empty line at the beginning or at the end!)
 * 2) update the KStandardDirs class documentation
 * 3) update the list in kde-config.cpp
 * 4) update the installPath() function below

data
.
html
doc/HTML
icon
icons
config
config
pixmap
pixmaps
sound
sounds
locale
locale
services
kservices5
servicetypes
kservicetypes5
wallpaper
wallpapers
templates
templates
exe
bin
module
%lib/plugins/kf5
qtplugins
%lib/plugins
kcfg
config.kcfg
emoticons
emoticons
xdgdata
.
xdgdata-apps
applications
xdgdata-icon
icons
xdgdata-pixmap
pixmaps
xdgdata-dirs
desktop-directories
xdgdata-mime
mime
xdgconf
.
xdgconf-menu
menus
xdgconf-autostart
autostart
*/

static const char types_string[] =
    "data\0"
    ".\0"
    "html\0"
    "doc/HTML\0"
    "icon\0"
    "icons\0"
    "config\0"
    "pixmap\0"
    "pixmaps\0"
    "sound\0"
    "sounds\0"
    "locale\0"
    "services\0"
    "kservices5\0"
    "servicetypes\0"
    "kservicetypes5\0"
    "wallpaper\0"
    "wallpapers\0"
    "templates\0"
    "exe\0"
    "bin\0"
    "module\0"
    "%lib/plugins/kf5\0"
    "qtplugins\0"
    "%lib/plugins\0"
    "kcfg\0"
    "config.kcfg\0"
    "emoticons\0"
    "xdgdata\0"
    "xdgdata-apps\0"
    "applications\0"
    "xdgdata-icon\0"
    "xdgdata-pixmap\0"
    "xdgdata-dirs\0"
    "desktop-directories\0"
    "xdgdata-mime\0"
    "mime\0"
    "xdgconf\0"
    "xdgconf-menu\0"
    "menus\0"
    "xdgconf-autostart\0"
    "autostart\0"
    "\0";

static const int types_indices[] = {
       0,    5,    7,   12,   21,   26,   32,   32,
      39,   46,   54,   60,   67,   67,   74,   83,
      94,  107,  122,  132,  143,  143,  153,  157,
     161,  168,  185,  195,  208,  213,  225,  225,
     235,    5,  243,  256,  269,   26,  282,   46,
     297,  310,  330,  343,  348,    5,  356,  369,
     375,  393,   -1
};

static void tokenize(QStringList &token, const QString &str,
                     const QString &delim);

enum BasePrefix { XdgConf, XdgData, KdePrefixes };
static BasePrefix basePrefixForResource(const char *type)
{
    // KF5: We now use xdgdata_prefixes for every resource in share/*,
    // i.e. everything except exe, lib, config and xdgconf...

    // TODO: exe: replaced with $PATH
    //       lib: unused as is, right?
    //     module: based on lib, but mostly replaced with QT_PLUGIN_PATH (+"/kf5")

    const QByteArray typeBa(type);
    if (typeBa.startsWith("xdgconf") || typeBa == "config") {
        return XdgConf;
    } else if (typeBa == "exe" || typeBa == "lib") {
        return KdePrefixes;
    } else { // was: if (typeBa.startsWith("xdgdata") || typeBa == "data")
        return XdgData;
    }
}

#ifdef Q_OS_WIN
QString getKde4Prefix();
#endif

static QString relativeInstallPath(const char *type)
{
    Q_ASSERT(type != nullptr);

    switch (type[0]) {
    case 'c':
        if (strcmp("config", type) == 0) {
            return QFile::decodeName(CONFIG_INSTALL_DIR "/");
        }
        break;
    case 'k':
        if (strcmp("kcfg", type) == 0) {
            return QFile::decodeName(KCFG_INSTALL_DIR "/");
        }
        if (strcmp("kdedir", type) == 0) {
            return QString::fromLatin1("");    // not null!
        }
        break;
    case 'd':
        if (strcmp("data", type) == 0) {
            return QFile::decodeName(DATA_INSTALL_DIR "/");
        }
        break;
    case 'e':
        if (strcmp("exe", type) == 0) {
            return QFile::decodeName(BIN_INSTALL_DIR "/");
        }
        break;
    case 'h':
        if (strcmp("html", type) == 0) {
            return QFile::decodeName(HTML_INSTALL_DIR "/");
        }
        break;
    case 'i':
        if (strcmp("icon", type) == 0) {
            return QFile::decodeName(ICON_INSTALL_DIR "/");
        }
        if (strcmp("include", type) == 0) {
            return QFile::decodeName(INCLUDE_INSTALL_DIR "/");
        }
        break;
    case 'l':
        if (strcmp("lib", type) == 0) {
            return QFile::decodeName(LIB_INSTALL_DIR "/");
        }
        if (strcmp("libexec", type) == 0) {
            return QFile::decodeName(LIB_INSTALL_DIR "/libexec/");
        }
        if (strcmp("locale", type) == 0) {
            return QFile::decodeName(LOCALE_INSTALL_DIR "/");
        }
        break;
    case 'm':
        if (strcmp("module", type) == 0) {
            return QFile::decodeName(PLUGIN_INSTALL_DIR "/");
        }
        break;
    case 'q':
        if (strcmp("qtplugins", type) == 0) {
            return QFile::decodeName(PLUGIN_INSTALL_DIR "/");
        }
        break;
    case 's':
        if (strcmp("services", type) == 0) {
            return QFile::decodeName(SERVICES_INSTALL_DIR "/");
        }
        if (strcmp("servicetypes", type) == 0) {
            return QFile::decodeName(SERVICETYPES_INSTALL_DIR "/");
        }
        if (strcmp("sound", type) == 0) {
            return QFile::decodeName(SOUND_INSTALL_DIR "/");
        }
        break;
    case 't':
        if (strcmp("templates", type) == 0) {
            return QFile::decodeName(TEMPLATES_INSTALL_DIR "/");
        }
        break;
    case 'w':
        if (strcmp("wallpaper", type) == 0) {
            return QFile::decodeName(WALLPAPER_INSTALL_DIR "/");
        }
        break;
    case 'x':
        if (strcmp("xdgconf-menu", type) == 0) {
            return QFile::decodeName(SYSCONF_INSTALL_DIR "/xdg/menus/");
        }
        if (strcmp("xdgdata-apps", type) == 0) {
            return QFile::decodeName(XDG_APPS_INSTALL_DIR "/");
        }
        if (strcmp("xdgdata-dirs", type) == 0) {
            return QFile::decodeName(XDG_DIRECTORY_INSTALL_DIR "/");
        }
        break;
    }
    return QString();
}

QString KStandardDirs::installPath(const char *type)
{
    const QString relPath = relativeInstallPath(type);
    if (relPath.isNull()) {
        return QString();
    } else if (QDir::isAbsolutePath(relPath)) {
        return relPath;
    } else {
#ifdef Q_OS_WIN
        return getKde4Prefix() + relPath;
#else
        return QFile::decodeName(CMAKE_INSTALL_PREFIX "/") + relPath;
#endif
    }
}

KStandardDirs::KStandardDirs()
    : d(new KStandardDirsPrivate(this))
{
    addKDEDefaults();
}

KStandardDirs::~KStandardDirs()
{
    delete d;
}

bool KStandardDirs::isRestrictedResource(const char *type, const QString &relPath) const
{
    if (!d->m_restrictionsActive) {
        return false;
    }

    if (d->m_restrictions.value(type, false)) {
        return true;
    }

    if (strcmp(type, "data") == 0 && d->hasDataRestrictions(relPath)) {
        return true;
    }

    return false;
}

bool KStandardDirs::KStandardDirsPrivate::hasDataRestrictions(const QString &relPath) const
{
    QString key;
    const int i = relPath.indexOf(QLatin1Char('/'));
    if (i != -1) {
        key = QString::fromLatin1("data_") + relPath.left(i);
    } else {
        key = QString::fromLatin1("data_") + relPath;
    }

    return m_restrictions.value(key.toLatin1(), false);
}

QStringList KStandardDirs::allTypes() const
{
    QStringList list;
    for (int i = 0; types_indices[i] != -1; i += 2) {
        list.append(QLatin1String(types_string + types_indices[i]));
    }
    // Those are added manually by addKDEDefaults
    list.append(QString::fromLatin1("lib"));
    //list.append(QString::fromLatin1("home")); // undocumented on purpose, said Waldo in r113855.

    // Those are handled by resourceDirs() itself
    list.append(QString::fromLatin1("socket"));
    list.append(QString::fromLatin1("tmp"));
    list.append(QString::fromLatin1("cache"));
    // Those are handled by installPath()
    list.append(QString::fromLatin1("include"));

    // If you add anything here, make sure kde-config.cpp has a description for it.

    return list;
}

static void priorityAdd(QStringList &prefixes, const QString &dir, bool priority)
{
    if (priority && !prefixes.isEmpty()) {
        // Add in front but behind the most-local prefix
        QStringList::iterator it = prefixes.begin();
        ++it;
        prefixes.insert(it, dir);
    } else {
        prefixes.append(dir);
    }
}

void KStandardDirs::addPrefix(const QString &_dir)
{
    addPrefix(_dir, false);
}

void KStandardDirs::addPrefix(const QString &_dir, bool priority)
{
    if (_dir.isEmpty()) {
        return;
    }

    QString dir = _dir;
    if (dir.at(dir.length() - 1) != QLatin1Char('/')) {
        dir += QLatin1Char('/');
    }

    if (!d->m_prefixes.contains(dir, cs)) {
        priorityAdd(d->m_prefixes, dir, priority);
        d->m_dircache.clear();
    }
}

void KStandardDirs::addXdgConfigPrefix(const QString &_dir)
{
    addXdgConfigPrefix(_dir, false);
}

void KStandardDirs::addXdgConfigPrefix(const QString &_dir, bool priority)
{
    if (_dir.isEmpty()) {
        return;
    }

    QString dir = _dir;
    if (dir.at(dir.length() - 1) != QLatin1Char('/')) {
        dir += QLatin1Char('/');
    }

    if (!d->xdgconf_prefixes.contains(dir, cs)) {
        priorityAdd(d->xdgconf_prefixes, dir, priority);
        d->m_dircache.clear();
    }
}

void KStandardDirs::addXdgDataPrefix(const QString &_dir)
{
    addXdgDataPrefix(_dir, false);
}

void KStandardDirs::addXdgDataPrefix(const QString &_dir, bool priority)
{
    if (_dir.isEmpty()) {
        return;
    }

    QString dir = _dir;
    if (dir.at(dir.length() - 1) != QLatin1Char('/')) {
        dir += QLatin1Char('/');
    }

    if (!d->xdgdata_prefixes.contains(dir, cs)) {
        priorityAdd(d->xdgdata_prefixes, dir, priority);
        d->m_dircache.clear();
    }
}

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
QString KStandardDirs::kfsstnd_prefixes()
{
    return d->m_prefixes.join(QString(QLatin1Char(':')));
}

bool KStandardDirs::addResourceType(const char *type,
                                    const QString &relativename,
                                    bool priority)
{
    return addResourceType(type, nullptr, relativename, priority);
}
#endif

bool KStandardDirs::addResourceType(const char *type,
                                    const char *basetype,
                                    const QString &relativename,
                                    bool priority)
{
    if (relativename.isEmpty()) {
        return false;
    }

    QString copy = relativename;
    if (basetype) {
        copy = QLatin1Char('%') + QString::fromLatin1(basetype) + QLatin1Char('/');
        if (relativename != QLatin1String("/")) {
            copy += relativename;
        }
    }

    if (!copy.endsWith(QLatin1Char('/'))) {
        copy += QLatin1Char('/');
    }

    QByteArray typeBa = type;
    QStringList &rels = d->m_relatives[typeBa]; // find or insert

    if (!rels.contains(copy, cs)) {
        if (priority) {
            rels.prepend(copy);
        } else {
            rels.append(copy);
        }
        // clean the caches
        d->m_dircache.remove(typeBa);
        d->m_savelocations.remove(typeBa);
        return true;
    }
    return false;
}

bool KStandardDirs::addResourceDir(const char *type,
                                   const QString &absdir,
                                   bool priority)
{
    if (absdir.isEmpty() || !type) {
        return false;
    }
    // find or insert entry in the map
    QString copy = absdir;
    if (copy.at(copy.length() - 1) != QLatin1Char('/')) {
        copy += QLatin1Char('/');
    }

    QByteArray typeBa = type;
    QStringList &paths = d->m_absolutes[typeBa];
    if (!paths.contains(copy, cs)) {
        if (priority) {
            paths.prepend(copy);
        } else {
            paths.append(copy);
        }
        // clean the caches
        d->m_dircache.remove(typeBa);
        d->m_savelocations.remove(typeBa);
        return true;
    }
    return false;
}

QString KStandardDirs::findResource(const char *type,
                                    const QString &_filename) const
{
    if (!QDir::isRelativePath(_filename)) {
        // absolute dirs are absolute dirs, right? :-/
        return KLocalizedString::localizedFilePath(_filename); // -- almost.
    }

#if 0
    kDebug(180) << "Find resource: " << type;
    for (QStringList::ConstIterator pit = m_prefixes.begin();
            pit != m_prefixes.end();
            ++pit) {
        kDebug(180) << "Prefix: " << *pit;
    }
#endif

    QString filename(_filename);
#ifdef Q_OS_WIN
    if (strcmp(type, "exe") == 0) {
        if (!filename.endsWith(QLatin1String(".exe"), Qt::CaseInsensitive)) {
            filename += QLatin1String(".exe");
        }
    }
#endif
    const QString dir = findResourceDir(type, filename);
    if (dir.isEmpty()) {
        return dir;
    } else {
        return KLocalizedString::localizedFilePath(dir + filename);
    }
}

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
static quint32 updateHash(const QString &file, quint32 hash)
{
    KDE_struct_stat buff;
    if ((KDE::access(file, R_OK) == 0) && (KDE::stat(file, &buff) == 0) && (S_ISREG(buff.st_mode))) {
        hash = hash + static_cast<quint32>(buff.st_ctime);
    }
    return hash;
}

quint32 KStandardDirs::calcResourceHash(const char *type,
                                        const QString &filename,
                                        SearchOptions options) const
{
    quint32 hash = 0;

    if (!QDir::isRelativePath(filename)) {
        // absolute dirs are absolute dirs, right? :-/
        return updateHash(filename, hash);
    }
    QStringList candidates = d->resourceDirs(type, filename);

    foreach (const QString &candidate, candidates) {
        hash = updateHash(candidate + filename, hash);
        if (!(options & Recursive) && hash) {
            return hash;
        }
    }
    return hash;
}
#endif

QStringList KStandardDirs::findDirs(const char *type,
                                    const QString &reldir) const
{
    QDir testdir;
    QStringList list;
    if (!QDir::isRelativePath(reldir)) {
        testdir.setPath(reldir);
        if (testdir.exists()) {
            if (reldir.endsWith(QLatin1Char('/'))) {
                list.append(reldir);
            } else {
                list.append(reldir + QLatin1Char('/'));
            }
        }
        return list;
    }

    const QStringList candidates = d->resourceDirs(type, reldir);

    for (QStringList::ConstIterator it = candidates.begin();
            it != candidates.end(); ++it) {
        testdir.setPath(*it + reldir);
        if (testdir.exists()) {
            list.append(testdir.absolutePath() + QLatin1Char('/'));
        }
    }

    return list;
}

QString KStandardDirs::findResourceDir(const char *type,
                                       const QString &_filename) const
{
#ifndef NDEBUG
    if (_filename.isEmpty()) {
        kWarning() << "filename for type " << type << " in KStandardDirs::findResourceDir is not supposed to be empty!!";
        return QString();
    }
#endif

    QString filename(_filename);
#ifdef Q_OS_WIN
    if (strcmp(type, "exe") == 0) {
        if (!filename.endsWith(QLatin1String(".exe"), Qt::CaseInsensitive)) {
            filename += QLatin1String(".exe");
        }
    }
#endif
    const QStringList candidates = d->resourceDirs(type, filename);

    for (QStringList::ConstIterator it = candidates.begin();
            it != candidates.end(); ++it) {
        if (exists(*it + filename)) {
            return *it;
        }
    }

#ifndef NDEBUG
    if (false && strcmp(type, "locale")) {
        kDebug(180) << "KStdDirs::findResDir(): can't find \"" << filename << "\" in type \"" << type << "\".";
    }
#endif

    return QString();
}

bool KStandardDirs::exists(const QString &fullPath)
{
#ifdef Q_OS_WIN
    // access() and stat() give a stupid error message to the user
    // if the path is not accessible at all (e.g. no disk in A:/ and
    // we do stat("A:/.directory")
    if (fullPath.endsWith(QLatin1Char('/'))) {
        return QDir(fullPath).exists();
    }
    return QFileInfo(fullPath).exists();
#else
    KDE_struct_stat buff;
    QByteArray cFullPath = QFile::encodeName(fullPath);
    if (access(cFullPath, R_OK) == 0 && KDE_stat(cFullPath, &buff) == 0) {
        if (!fullPath.endsWith(QLatin1Char('/'))) {
            if (S_ISREG(buff.st_mode)) {
                return true;
            }
        } else if (S_ISDIR(buff.st_mode)) {
            return true;
        }
    }
    return false;
#endif
}

static void lookupDirectory(const QString &path, const QString &relPart,
                            const QRegExp &regexp,
                            QStringList &list,
                            QStringList &relList,
                            bool recursive, bool unique)
{
    const QString pattern = regexp.pattern();
    if (recursive || pattern.contains(QLatin1Char('?')) || pattern.contains(QLatin1Char('*'))) {
        if (path.isEmpty()) { //for sanity
            return;
        }
#ifdef Q_OS_WIN
        QString path_ = path + QLatin1String("*.*");
        WIN32_FIND_DATA findData;
        HANDLE hFile = FindFirstFile((LPWSTR)path_.utf16(), &findData);
        if (hFile == INVALID_HANDLE_VALUE) {
            return;
        }
        do {
            const int len = wcslen(findData.cFileName);
            if (!(findData.cFileName[0] == '.' &&
                    findData.cFileName[1] == '\0') &&
                    !(findData.cFileName[0] == '.' &&
                      findData.cFileName[1] == '.' &&
                      findData.cFileName[2] == '\0') &&
                    (findData.cFileName[len - 1] != '~')) {
                QString fn = QString::fromUtf16((const unsigned short *)findData.cFileName);
                if (!recursive && !regexp.exactMatch(fn)) {
                    continue;    // No match
                }
                QString pathfn = path + fn;
                bool bIsDir = ((findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY);
                if (recursive) {
                    if (bIsDir) {
                        lookupDirectory(pathfn + QLatin1Char('/'),
                                        relPart + fn + QLatin1Char('/'),
                                        regexp, list, relList, recursive, unique);
                    }
                    if (!regexp.exactMatch(fn)) {
                        continue;    // No match
                    }
                }
                if (!bIsDir) {
                    if (!unique || !relList.contains(relPart + fn, cs)) {
                        list.append(pathfn);
                        relList.append(relPart + fn);
                    }
                }
            }
        } while (FindNextFile(hFile, &findData) != 0);
        FindClose(hFile);
#else
        // We look for a set of files.
        DIR *dp = opendir(QFile::encodeName(path));
        if (!dp) {
            return;
        }

        assert(path.endsWith(QLatin1Char('/')));

        struct dirent *ep;

        while ((ep = readdir(dp)) != nullptr) {
            QString fn(QFile::decodeName(ep->d_name));
            if (fn == QString::fromLatin1(".") || fn == QString::fromLatin1("..") || fn.at(fn.length() - 1) == QLatin1Char('~')) {
                continue;
            }

            if (!recursive && !regexp.exactMatch(fn)) {
                continue;    // No match
            }

            bool isDir;
            bool isReg;

            QString pathfn = path + fn;
#if HAVE_DIRENT_D_TYPE
            isDir = ep->d_type == DT_DIR;
            isReg = ep->d_type == DT_REG;

            if (ep->d_type == DT_UNKNOWN || ep->d_type == DT_LNK)
#endif
            {
                KDE_struct_stat buff;
                if (KDE::stat(pathfn, &buff) != 0) {
                    kDebug(180) << "Error stat'ing " << pathfn << " : " << perror;
                    continue; // Couldn't stat (e.g. no read permissions)
                }
                isReg = S_ISREG(buff.st_mode);
                isDir = S_ISDIR(buff.st_mode);
            }

            if (recursive) {
                if (isDir) {
                    lookupDirectory(pathfn + QLatin1Char('/'), relPart + fn + QLatin1Char('/'), regexp, list, relList, recursive, unique);
                }
                if (!regexp.exactMatch(fn)) {
                    continue;    // No match
                }
            }
            if (isReg) {
                if (!unique || !relList.contains(relPart + fn, cs)) {
                    list.append(pathfn);
                    relList.append(relPart + fn);
                }
            }
        }
        closedir(dp);
#endif
    } else {
        // We look for a single file.
        QString fn = pattern;
        QString pathfn = path + fn;
        KDE_struct_stat buff;
        if (KDE::stat(pathfn, &buff) != 0) {
            return;    // File not found
        }
        if (S_ISREG(buff.st_mode)) {
            if (!unique || !relList.contains(relPart + fn, cs)) {
                list.append(pathfn);
                relList.append(relPart + fn);
            }
        }
    }
}

static void lookupPrefix(const QString &prefix, const QString &relpath,
                         const QString &relPart,
                         const QRegExp &regexp,
                         QStringList &list,
                         QStringList &relList,
                         bool recursive, bool unique)
{
    if (relpath.isEmpty()) {
        if (recursive) {
            Q_ASSERT(prefix != QLatin1String("/"));    // we don't want to recursively list the whole disk!
        }
        lookupDirectory(prefix, relPart, regexp, list,
                        relList, recursive, unique);
        return;
    }
    QString path;
    QString rest;

    int slash = relpath.indexOf(QLatin1Char('/'));
    if (slash < 0) {
        rest = relpath.left(relpath.length() - 1);
    } else {
        path = relpath.left(slash);
        rest = relpath.mid(slash + 1);
    }

    if (prefix.isEmpty()) { //for sanity
        return;
    }
#ifndef Q_OS_WIN
    // what does this assert check ?
    assert(prefix.endsWith(QLatin1Char('/')));
#endif
    if (path.contains(QLatin1Char('*')) || path.contains(QLatin1Char('?'))) {

        QRegExp pathExp(path, Qt::CaseSensitive, QRegExp::Wildcard);

#ifdef Q_OS_WIN
        QString prefix_ = prefix + QLatin1String("*.*");
        WIN32_FIND_DATA findData;
        HANDLE hFile = FindFirstFile((LPWSTR)prefix_.utf16(), &findData);
        if (hFile == INVALID_HANDLE_VALUE) {
            return;
        }
        do {
            const int len = wcslen(findData.cFileName);
            if (!(findData.cFileName[0] == '.' &&
                    findData.cFileName[1] == '\0') &&
                    !(findData.cFileName[0] == '.' &&
                      findData.cFileName[1] == '.' &&
                      findData.cFileName[2] == '\0') &&
                    (findData.cFileName[len - 1] != '~')) {
                const QString fn = QString::fromUtf16((const unsigned short *)findData.cFileName);
                if (!pathExp.exactMatch(fn)) {
                    continue;    // No match
                }
                if ((findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)
                    lookupPrefix(prefix + fn + QLatin1Char('/'),
                                 rest, relPart + fn + QLatin1Char('/'),
                                 regexp, list, relList, recursive, unique);
            }
        } while (FindNextFile(hFile, &findData) != 0);
        FindClose(hFile);
#else
        DIR *dp = opendir(QFile::encodeName(prefix));
        if (!dp) {
            return;
        }

        struct dirent *ep;

        while ((ep = readdir(dp)) != nullptr) {
            QString fn(QFile::decodeName(ep->d_name));
            if (fn == QLatin1String(".") || fn == QLatin1String("..") || fn.at(fn.length() - 1) == QLatin1Char('~')) {
                continue;
            }

            if (!pathExp.exactMatch(fn)) {
                continue;    // No match
            }
            QString rfn = relPart + fn;
            fn = prefix + fn;

            bool isDir;

#if HAVE_DIRENT_D_TYPE
            isDir = ep->d_type == DT_DIR;

            if (ep->d_type == DT_UNKNOWN || ep->d_type == DT_LNK)
#endif
            {
                QString pathfn = path + fn;
                KDE_struct_stat buff;
                if (KDE::stat(fn, &buff) != 0) {
                    kDebug(180) << "Error stat'ing " << fn << " : " << perror;
                    continue; // Couldn't stat (e.g. no read permissions)
                }
                isDir = S_ISDIR(buff.st_mode);
            }
            if (isDir) {
                lookupPrefix(fn + QLatin1Char('/'), rest, rfn + QLatin1Char('/'), regexp, list, relList, recursive, unique);
            }
        }

        closedir(dp);
#endif
    } else {
        // Don't stat, if the dir doesn't exist we will find out
        // when we try to open it.
        lookupPrefix(prefix + path + QLatin1Char('/'), rest,
                     relPart + path + QLatin1Char('/'), regexp, list,
                     relList, recursive, unique);
    }
}

QStringList
KStandardDirs::findAllResources(const char *type,
                                const QString &filter,
                                SearchOptions options,
                                QStringList &relList) const
{
    QString filterPath;
    QString filterFile;

    if (!filter.isEmpty()) {
        int slash = filter.lastIndexOf(QLatin1Char('/'));
        if (slash < 0) {
            filterFile = filter;
        } else {
            filterPath = filter.left(slash + 1);
            filterFile = filter.mid(slash + 1);
        }
    }

    QStringList candidates;
    if (!QDir::isRelativePath(filter)) { // absolute path
#ifdef Q_OS_WIN
        candidates << filterPath.left(3); //e.g. "C:\"
        filterPath = filterPath.mid(3);
#else
        candidates << QString::fromLatin1("/");
        filterPath = filterPath.mid(1);
#endif
    } else {
        candidates = d->resourceDirs(type, filter);
    }

    if (filterFile.isEmpty()) {
        filterFile = QString(QLatin1Char('*'));
    }

    QRegExp regExp(filterFile, Qt::CaseSensitive, QRegExp::Wildcard);

    QStringList list;
    foreach (const QString &candidate, candidates) {
        lookupPrefix(candidate, filterPath, QString(), regExp, list,
                     relList, options & Recursive, options & NoDuplicates);
    }

    return list;
}

QStringList
KStandardDirs::findAllResources(const char *type,
                                const QString &filter,
                                SearchOptions options) const
{
    QStringList relList;
    return findAllResources(type, filter, options, relList);
}

// ####### KDE4: should this be removed, in favor of QDir::canonicalPath()?
// aseigo: QDir::canonicalPath returns QString() if the dir doesn't exist
//         and this method is often used with the expectation for it to work
//         even if the directory doesn't exist. so ... no, we can't drop this
//         yet
QString
KStandardDirs::realPath(const QString &dirname)
{
#ifdef Q_OS_WIN
    const QString strRet = realFilePath(dirname);
    if (!strRet.endsWith(QLatin1Char('/'))) {
        return strRet + QLatin1Char('/');
    }
    return strRet;
#else
    if (dirname.isEmpty() || (dirname.size() == 1 && dirname.at(0) == QLatin1Char('/'))) {
        return dirname;
    }

    if (dirname.at(0) != QLatin1Char('/')) {
        qWarning("realPath called with a relative path '%s', please fix", qPrintable(dirname));
        return dirname;
    }

    char realpath_buffer[MAXPATHLEN + 1];
    memset(realpath_buffer, 0, MAXPATHLEN + 1);

    /* If the path contains symlinks, get the real name */
    if (realpath(QFile::encodeName(dirname).constData(), realpath_buffer) != nullptr) {
        // success, use result from realpath
        int len = strlen(realpath_buffer);
        realpath_buffer[len] = '/';
        realpath_buffer[len + 1] = 0;
        return QFile::decodeName(realpath_buffer);
    }

    // Does not exist yet; resolve symlinks in parent dirs then.
    // This ensures that once the directory exists, it will still be resolved
    // the same way, so that the general rule that KStandardDirs always returns
    // canonical paths stays true, and app code can compare paths more easily.
    QString dir = dirname;
    if (!dir.endsWith(QLatin1Char('/'))) {
        dir += QLatin1Char('/');
    }
    QString relative;
    while (!KStandardDirs::exists(dir)) {
        //qDebug() << "does not exist:" << dir;
        const int pos = dir.lastIndexOf(QLatin1Char('/'), -2);
        Q_ASSERT(pos >= 0); // what? even "/" doesn't exist?
        relative.prepend(dir.mid(pos + 1)); // keep "subdir/"
        dir = dir.left(pos + 1);
        Q_ASSERT(dir.endsWith(QLatin1Char('/')));
    }
    Q_ASSERT(!relative.isEmpty()); // infinite recursion ahead
    if (!relative.isEmpty()) {
        //qDebug() << "done, resolving" << dir << "and adding" << relative;
        dir = realPath(dir) + relative;
    }
    return dir;
#endif
}

// ####### KDE4: should this be removed, in favor of QFileInfo::canonicalFilePath()?
// aseigo: QDir::canonicalPath returns QString() if the dir doesn't exist
//         and this method is often used with the expectation for it to work
//         even if the directory doesn't exist. so ... no, we can't drop this
//         yet
QString
KStandardDirs::realFilePath(const QString &filename)
{
#ifdef Q_OS_WIN
    LPCWSTR lpIn = (LPCWSTR)filename.utf16();
    QVarLengthArray<WCHAR, MAX_PATH> buf(MAX_PATH);
    DWORD len = GetFullPathNameW(lpIn, buf.size(), buf.data(), NULL);
    if (len > (DWORD)buf.size()) {
        buf.resize(len);
        len = GetFullPathNameW(lpIn, buf.size(), buf.data(), NULL);
    }
    if (len == 0) {
        return QString();
    }
    return QString::fromUtf16((const unsigned short *)buf.data()).replace(QLatin1Char('\\'), QLatin1Char('/'));
#else
    char realpath_buffer[MAXPATHLEN + 1];
    memset(realpath_buffer, 0, MAXPATHLEN + 1);

    /* If the path contains symlinks, get the real name */
    if (realpath(QFile::encodeName(filename).constData(), realpath_buffer) != nullptr) {
        // success, use result from realpath
        return QFile::decodeName(realpath_buffer);
    }

    return filename;
#endif
}

QStringList KStandardDirs::resourceDirs(const char *type) const
{
    return d->resourceDirs(type, QString());
}

QStringList KStandardDirs::KStandardDirsPrivate::resourceDirs(const char *type, const QString &subdirForRestrictions)
{
    QMutexLocker lock(&m_cacheMutex);
    const bool dataRestrictionActive = m_restrictionsActive
                                       && (strcmp(type, "data") == 0)
                                       && hasDataRestrictions(subdirForRestrictions);

    QMap<QByteArray, QStringList>::const_iterator dirCacheIt = m_dircache.constFind(type);

    QStringList candidates;

    if (dirCacheIt != m_dircache.constEnd() && !dataRestrictionActive) {
        //qDebug() << this << "resourceDirs(" << type << "), in cache already";
        candidates = *dirCacheIt;
    } else { // filling cache
        //qDebug() << this << "resourceDirs(" << type << "), not in cache";
        q->addResourceDir("socket", QStandardPaths::writableLocation(QStandardPaths::RuntimeLocation));
        q->addResourceDir("tmp", QStandardPaths::writableLocation(QStandardPaths::TempLocation));
        q->addResourceDir("cache", QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation));

        QDir testdir;

        bool restrictionActive = false;
        if (m_restrictionsActive) {
            if (dataRestrictionActive) {
                restrictionActive = true;
            }
            if (m_restrictions.value("all", false)) {
                restrictionActive = true;
            } else if (m_restrictions.value(type, false)) {
                restrictionActive = true;
            }
        }

        const QStringList dirs = m_relatives.value(type);
        QString typeInstallPath;
        if (strcmp(type, "xdgdata-apps") == 0) {
            // If the resource is xdgdata-apps, we never actually want the
            // install directory (which is probably a subdirectory of
            // CMAKE_INSTALL_PREFIX/share/applications/), but instead we want
            // CMAKE_INSTALL_PREFIX/share/applications/ itself.
#ifdef Q_OS_WIN
            typeInstallPath = getKde4Prefix() + QLatin1String("share/applications/");
#else
            typeInstallPath = QFile::decodeName(CMAKE_INSTALL_PREFIX "/") + QLatin1String("share/applications/");
#endif
        } else {
            typeInstallPath = installPath(type); // could be empty
        }
        const QString installdir = typeInstallPath.isEmpty() ? QString() : realPath(typeInstallPath);
        const QString installprefix = installPath("kdedir");
        if (!dirs.isEmpty()) {
            bool local = true;

            for (QStringList::ConstIterator it = dirs.constBegin();
                    it != dirs.constEnd(); ++it) {
                if ((*it).startsWith(QLatin1Char('%'))) {
                    // grab the "data" from "%data/apps"
                    const int pos = (*it).indexOf(QLatin1Char('/'));
                    QString rel = (*it).mid(1, pos - 1);
                    QString rest = (*it).mid(pos + 1);
                    const QStringList basedirs = resourceDirs(rel.toUtf8().constData(), subdirForRestrictions);
                    for (QStringList::ConstIterator it2 = basedirs.begin();
                            it2 != basedirs.end(); ++it2) {
                        const QString path = realPath(*it2 + rest);
                        testdir.setPath(path);
                        if ((local || testdir.exists()) && !candidates.contains(path, cs)) {
                            candidates.append(path);
                        }
                        local = false;
                    }
                }
            }

            const QStringList *prefixList = nullptr;
            const BasePrefix basePrefix = basePrefixForResource(type);
            if (basePrefix == XdgConf) {
                prefixList = &(xdgconf_prefixes);
            } else if (basePrefix == XdgData) {
                prefixList = &(xdgdata_prefixes);
            } else if (basePrefix == KdePrefixes) {
                prefixList = &m_prefixes;
            }

            for (QStringList::ConstIterator pit = prefixList->begin();
                    pit != prefixList->end();
                    ++pit) {
                if ((*pit).compare(installprefix, cs) != 0 || installdir.isEmpty()) {
                    for (QStringList::ConstIterator it = dirs.constBegin();
                            it != dirs.constEnd(); ++it) {
                        if ((*it).startsWith(QLatin1Char('%'))) {
                            continue;
                        }
                        const QString path = realPath(*pit + *it);
                        testdir.setPath(path);
                        if (local && restrictionActive) {
                            continue;
                        }
                        if ((local || testdir.exists()) && !candidates.contains(path, cs)) {
                            candidates.append(path);
                        }
                    }
                    local = false;
                } else {
                    // we have a custom install path, so use this instead of <installprefix>/<relative dir>
                    testdir.setPath(installdir);
                    if (testdir.exists() && ! candidates.contains(installdir, cs)) {
                        candidates.append(installdir);
                    }
                }
            }
        }

        // make sure we find the path where it's installed
        if (!installdir.isEmpty()) {
            bool ok = true;
            foreach (const QString &s, candidates) {
                if (installdir.startsWith(s, cs)) {
                    ok = false;
                    break;
                }
            }
            if (ok) {
                candidates.append(installdir);
            }
        }

        const QStringList absDirs = m_absolutes.value(type);
        for (QStringList::ConstIterator it = absDirs.constBegin();
                it != absDirs.constEnd(); ++it) {
            testdir.setPath(*it);
            if (testdir.exists()) {
                const QString filename = realPath(*it);
                if (!candidates.contains(filename, cs)) {
                    candidates.append(filename);
                }
            }
        }

        // Insert result into the cache for next time.
        // Exception: data_subdir restrictions are per-subdir, so we can't store such results
        if (!dataRestrictionActive) {
            //qDebug() << this << "Inserting" << type << candidates << "into dircache";
            m_dircache.insert(type, candidates);
        }
    }

#if 0
    kDebug(180) << "found dirs for resource" << type << ":" << candidates;
#endif

    return candidates;
}

#ifdef Q_OS_WIN
static QStringList executableExtensions()
{
    QStringList ret = QString::fromLocal8Bit(qgetenv("PATHEXT")).split(QLatin1Char(';'));
    if (!ret.contains(QLatin1String(".exe"), Qt::CaseInsensitive)) {
        // If %PATHEXT% does not contain .exe, it is either empty, malformed, or distorted in ways that we cannot support, anyway.
        ret.clear();
        ret << QLatin1String(".exe")
            << QLatin1String(".com")
            << QLatin1String(".bat")
            << QLatin1String(".cmd");
    }
    return ret;
}
#endif

QStringList KStandardDirs::systemPaths(const QString &pstr)
{
    QStringList tokens;
    QString p = pstr;

    if (p.isEmpty()) {
        p = QString::fromLocal8Bit(qgetenv("PATH"));
    }

    QString delimiters(QLatin1Char(KPATH_SEPARATOR));
    delimiters += QLatin1Char('\b');
    tokenize(tokens, p, delimiters);

    QStringList exePaths;

    // split path using : or \b as delimiters
    for (int i = 0; i < tokens.count(); i++) {
        exePaths << KShell::tildeExpand(tokens[ i ]);
    }

    return exePaths;
}

#ifdef Q_OS_MAC
static QString getBundle(const QString &path, bool ignore)
{
    //kDebug(180) << "getBundle(" << path << ", " << ignore << ") called";
    QFileInfo info;
    QString bundle = path;
    bundle += QLatin1String(".app/Contents/MacOS/") + bundle.section(QLatin1Char('/'), -1);
    info.setFile(bundle);
    FILE *file;
    if (file = fopen(info.absoluteFilePath().toUtf8().constData(), "r")) {
        fclose(file);
        struct stat _stat;
        if ((stat(info.absoluteFilePath().toUtf8().constData(), &_stat)) < 0) {
            return QString();
        }
        if (ignore || (_stat.st_mode & S_IXUSR)) {
            if (((_stat.st_mode & S_IFMT) == S_IFREG) || ((_stat.st_mode & S_IFMT) == S_IFLNK)) {
                //kDebug(180) << "getBundle(): returning " << bundle;
                return bundle;
            }
        }
    }
    return QString();
}
#endif

static QString checkExecutable(const QString &path, bool ignoreExecBit)
{
#ifdef Q_OS_MAC
    QString bundle = getBundle(path, ignoreExecBit);
    if (!bundle.isEmpty()) {
        //kDebug(180) << "findExe(): returning " << bundle;
        return bundle;
    }
#endif
    QFileInfo info(path);
    QFileInfo orig = info;
#if defined(Q_OS_DARWIN) || defined(Q_OS_MAC)
    FILE *file;
    if (file = fopen(orig.absoluteFilePath().toUtf8().constData(), "r")) {
        fclose(file);
        struct stat _stat;
        if ((stat(orig.absoluteFilePath().toUtf8().constData(), &_stat)) < 0) {
            return QString();
        }
        if (ignoreExecBit || (_stat.st_mode & S_IXUSR)) {
            if (((_stat.st_mode & S_IFMT) == S_IFREG) || ((_stat.st_mode & S_IFMT) == S_IFLNK)) {
                orig.makeAbsolute();
                return orig.filePath();
            }
        }
    }
    return QString();
#else
    if (info.exists() && info.isSymLink()) {
        info = QFileInfo(info.canonicalFilePath());
    }
    if (info.exists() && (ignoreExecBit || info.isExecutable()) && info.isFile()) {
        // return absolute path, but without symlinks resolved in order to prevent
        // problems with executables that work differently depending on name they are
        // run as (for example gunzip)
        orig.makeAbsolute();
        return QDir::cleanPath(orig.filePath());
    }
    //kDebug(180) << "checkExecutable(): failed, returning empty string";
    return QString();
#endif
}

// KDE5 TODO: remove IgnoreExecBit almost unused
QString KStandardDirs::findExe(const QString &appname,
                               const QString &pstr,
                               SearchOptions options)
{
    //kDebug(180) << "findExe(" << appname << ", pstr, " << ignoreExecBit << ") called";

#ifdef Q_OS_WIN
    QStringList executable_extensions = executableExtensions();
    if (!executable_extensions.contains(appname.section(QLatin1Char('.'), -1, -1, QString::SectionIncludeLeadingSep), Qt::CaseInsensitive)) {
        QString found_exe;
        foreach (const QString &extension, executable_extensions) {
            found_exe = findExe(appname + extension, pstr, options);
            if (!found_exe.isEmpty()) {
                return found_exe;
            }
        }
        return QString();
    }
#endif
    QFileInfo info;

    // absolute or relative path?
    if (QDir::isAbsolutePath(appname)) {
        //kDebug(180) << "findExe(): absolute path given";
        QString path = checkExecutable(appname, options & IgnoreExecBit);
        return path;
    }

    //kDebug(180) << "findExe(): relative path given";

    QString p = installPath("libexec") + appname;
    QString result = checkExecutable(p, options & IgnoreExecBit);
    if (!result.isEmpty()) {
        //kDebug(180) << "findExe(): returning " << result;
        return result;
    }

    //kDebug(180) << "findExe(): checking system paths";
    const QStringList exePaths = systemPaths(pstr);
    for (QStringList::ConstIterator it = exePaths.begin(); it != exePaths.end(); ++it) {
        p = (*it) + QLatin1Char('/');
        p += appname;

        // Check for executable in this tokenized path
        result = checkExecutable(p, options & IgnoreExecBit);
        if (!result.isEmpty()) {
            //kDebug(180) << "findExe(): returning " << result;
            return result;
        }
    }

    // Not found in PATH, look into the KDE-specific bin dir ("exe" resource)
    p = installPath("exe");
    p += appname;
    result = checkExecutable(p, options & IgnoreExecBit);
    if (!result.isEmpty()) {
        //kDebug(180) << "findExe(): returning " << result;
        return result;
    }

    // If we reach here, the executable wasn't found.
    // So return empty string.

    //kDebug(180) << "findExe(): failed, nothing matched";
    return QString();
}

// TODO: very rarely used. Only known example is kdevelop looking for all qmakes/cmakes in the path.
int KStandardDirs::findAllExe(QStringList &list, const QString &appname,
                              const QString &pstr, SearchOptions options)
{
#ifdef Q_OS_WIN
    QStringList executable_extensions = executableExtensions();
    if (!executable_extensions.contains(appname.section(QLatin1Char('.'), -1, -1, QString::SectionIncludeLeadingSep), Qt::CaseInsensitive)) {
        int total = 0;
        foreach (const QString &extension, executable_extensions) {
            total += findAllExe(list, appname + extension, pstr, options);
        }
        return total;
    }
#endif
    QFileInfo info;
    QString p;
    list.clear();

    const QStringList exePaths = systemPaths(pstr);
    for (QStringList::ConstIterator it = exePaths.begin(); it != exePaths.end(); ++it) {
        p = (*it) + QLatin1Char('/');
        p += appname;

#ifdef Q_OS_MAC
        QString bundle = getBundle(p, (options & IgnoreExecBit));
        if (!bundle.isEmpty()) {
            //kDebug(180) << "findExe(): returning " << bundle;
            list.append(bundle);
        }
#endif

        info.setFile(p);

        if (info.exists() && ((options & IgnoreExecBit) || info.isExecutable())
                && info.isFile()) {
            list.append(p);
        }
    }

    return list.count();
}

static inline QString equalizePath(QString &str)
{
#ifdef Q_OS_WIN
    // filter pathes through QFileInfo to have always
    // the same case for drive letters
    QFileInfo f(str);
    if (f.isAbsolute()) {
        return f.absoluteFilePath();
    } else
#endif
        return str;
}

static void tokenize(QStringList &tokens, const QString &str,
                     const QString &delim)
{
    const int len = str.length();
    QString token;

    for (int index = 0; index < len; index++) {
        if (delim.contains(str[index])) {
            tokens.append(equalizePath(token));
            token.clear();
        } else {
            token += str[index];
        }
    }
    if (!token.isEmpty()) {
        tokens.append(equalizePath(token));
    }
}

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
QString KStandardDirs::kde_default(const char *type)
{
    return QString(QLatin1Char('%')) + QString::fromLatin1(type) + QLatin1Char('/');
}
#endif

QString KStandardDirs::saveLocation(const char *type,
                                    const QString &suffix,
                                    bool create) const
{
    QMutexLocker lock(&d->m_cacheMutex);
    QString path = d->m_savelocations.value(type);
    if (path.isEmpty()) {
        QStringList dirs = d->m_relatives.value(type);
        if (dirs.isEmpty() && (
                    (strcmp(type, "socket") == 0) ||
                    (strcmp(type, "tmp") == 0) ||
                    (strcmp(type, "cache") == 0))) {
            (void) resourceDirs(type); // Generate socket|tmp|cache resource.
            dirs = d->m_relatives.value(type); // Search again.
        }
        if (!dirs.isEmpty()) {
            path = dirs.first();

            if (path.startsWith(QLatin1Char('%'))) {
                // grab the "data" from "%data/apps"
                const int pos = path.indexOf(QLatin1Char('/'));
                QString rel = path.mid(1, pos - 1);
                QString rest = path.mid(pos + 1);
                QString basepath = saveLocation(rel.toUtf8().constData(), QString(), create);
                path = basepath + rest;
            } else {
                if (path == QLatin1String("./")) {
                    path.clear();
                }
                // Check for existence of typed directory + suffix
                const BasePrefix basePrefix = basePrefixForResource(type);
                if (basePrefix == XdgConf) {
                    path = realPath(localxdgconfdir() + path);
                } else if (basePrefix == XdgData) {
                    path = realPath(localxdgdatadir() + path);
                } else {
                    path = realPath(localkdedir() + path);
                }
            }
        } else {
            dirs = d->m_absolutes.value(type);
            if (dirs.isEmpty()) {
                qFatal("KStandardDirs: The resource type %s is not registered", type);
            } else {
                path = realPath(dirs.first());
            }
        }

        d->m_savelocations.insert(type, path.endsWith(QLatin1Char('/')) ? path : path + QLatin1Char('/'));
    }
    QString fullPath = path + suffix;

    KDE_struct_stat st;
    if (KDE::stat(fullPath, &st) != 0 || !(S_ISDIR(st.st_mode))) {
        if (!create) {
#ifndef NDEBUG
            // Too much noise from kbuildsycoca4 -- it's fine if this happens from KConfig
            // when parsing global files without a local equivalent.
            //kDebug(180) << QString("save location %1 doesn't exist").arg(fullPath);
#endif
            return fullPath;
        }
        if (!makeDir(fullPath, 0700)) {
            return fullPath;
        }
        d->m_dircache.remove(type);
    }
    if (!fullPath.endsWith(QLatin1Char('/'))) {
        fullPath += QLatin1Char('/');
    }
    return fullPath;
}

QString KStandardDirs::relativeLocation(const char *type, const QString &absPath) const
{
    QString fullPath = absPath;
    int i = absPath.lastIndexOf(QLatin1Char('/'));
    if (i != -1) {
        fullPath = realFilePath(absPath); // Normalize
    }

    const QStringList candidates = resourceDirs(type);

    for (QStringList::ConstIterator it = candidates.begin();
            it != candidates.end(); ++it) {
        if (fullPath.startsWith(*it, cs)) {
            return fullPath.mid((*it).length());
        }
    }
    return absPath;
}

bool KStandardDirs::makeDir(const QString &dir, int mode)
{
    // we want an absolute path
    if (QDir::isRelativePath(dir)) {
        return false;
    }

#ifdef Q_OS_WIN
    return QDir().mkpath(dir);
#else
    QString target = dir;
    uint len = target.length();

    // append trailing slash if missing
    if (dir.at(len - 1) != QLatin1Char('/')) {
        target += QLatin1Char('/');
    }

    QString base;
    uint i = 1;

    while (i < len) {
        KDE_struct_stat st;
        int pos = target.indexOf(QLatin1Char('/'), i);
        base += target.mid(i - 1, pos - i + 1);
        QByteArray baseEncoded = QFile::encodeName(base);
        // bail out if we encountered a problem
        if (KDE_stat(baseEncoded, &st) != 0) {
            // Directory does not exist....
            // Or maybe a dangling symlink ?
            if (KDE_lstat(baseEncoded, &st) == 0) {
                (void)unlink(baseEncoded);    // try removing
            }

            if (KDE_mkdir(baseEncoded, static_cast<mode_t>(mode)) != 0) {
                baseEncoded.prepend("trying to create local folder ");
                perror(baseEncoded.constData());
                return false; // Couldn't create it :-(
            }
        }
        i = pos + 1;
    }
    return true;
#endif
}

static QString readEnvPath(const char *env)
{
    QByteArray c_path;
#ifndef _WIN32_WCE
    c_path = qgetenv(env);
    if (c_path.isEmpty()) {
        return QString();
    }
#else
    bool ok;
    QString retval = getWin32RegistryValue(HKEY_LOCAL_MACHINE, "Software\\kde", "KDEDIRS", &ok);
    if (!ok) {
        return QString();
    } else {
        c_path = retval.toLatin1();
    }
#endif
    return QDir::fromNativeSeparators(QFile::decodeName(c_path));
}

#ifdef __linux__
static QString executablePrefix()
{
    char path_buffer[MAXPATHLEN + 1];
    path_buffer[MAXPATHLEN] = 0;
    int length = readlink("/proc/self/exe", path_buffer, MAXPATHLEN);
    if (length == -1) {
        return QString();
    }

    path_buffer[length] = '\0';

    QString path = QFile::decodeName(path_buffer);

    if (path.isEmpty()) {
        return QString();
    }

    int pos = path.lastIndexOf(QLatin1Char('/')); // Skip filename
    if (pos <= 0) {
        return QString();
    }
    pos = path.lastIndexOf(QLatin1Char('/'), pos - 1); // Skip last directory
    if (pos <= 0) {
        return QString();
    }

    return path.left(pos);
}
#endif

void KStandardDirs::addResourcesFrom_krcdirs()
{
    QString localFile = QDir::currentPath() + QLatin1String("/.krcdirs");
    if (!QFile::exists(localFile)) {
        return;
    }

    QSettings iniFile(localFile, QSettings::IniFormat);
    iniFile.beginGroup(QString::fromLatin1("KStandardDirs"));
    const QStringList resources = iniFile.allKeys();
    foreach (const QString &key, resources) {
        QDir path(iniFile.value(key).toString());
        if (!path.exists()) {
            continue;
        }

        if (path.makeAbsolute()) {
            addResourceDir(key.toLatin1(), path.path(), false);
        }
    }
}

void KStandardDirs::addKDEDefaults()
{
    addResourcesFrom_krcdirs();

    QStringList kdedirList;
    // begin KDEDIRS
    QString kdedirs = readEnvPath("KDEDIRS");

    if (!kdedirs.isEmpty()) {
        tokenize(kdedirList, kdedirs, QString(QLatin1Char(KPATH_SEPARATOR)));
    }
    kdedirList.append(installPath("kdedir"));

    QString execPrefix(QFile::decodeName(EXEC_INSTALL_PREFIX));
    if (!execPrefix.isEmpty() && !kdedirList.contains(execPrefix, cs)) {
        kdedirList.append(execPrefix);
    }
#ifdef __linux__
    const QString linuxExecPrefix = executablePrefix();
    if (!linuxExecPrefix.isEmpty()) {
        kdedirList.append(linuxExecPrefix);
    }
#endif

#if 0 // No longer applicable in KDE Frameworks 5
    // We treat root differently to prevent a "su" shell messing up the
    // file permissions in the user's home directory.
    QString localKdeDir = readEnvPath(getuid() ? "KDEHOME" : "KDEROOTHOME");
    if (!localKdeDir.isEmpty()) {
        if (!localKdeDir.endsWith(QLatin1Char('/'))) {
            localKdeDir += QLatin1Char('/');
        }
    } else {
#if defined(Q_OS_MAC)
        localKdeDir =  QDir::homePath() + QLatin1String("/Library/Preferences/KDE/");
#elif defined(Q_OS_WIN)
#ifndef _WIN32_WCE
        WCHAR wPath[MAX_PATH + 1];
        if (SHGetFolderPathW(NULL, CSIDL_APPDATA, NULL, SHGFP_TYPE_CURRENT, wPath) == S_OK) {
            localKdeDir = QDir::fromNativeSeparators(QString::fromUtf16((const ushort *) wPath)) + QLatin1Char('/') + QString::fromLatin1(KDE_DEFAULT_HOME) + QLatin1Char('/');
        } else {
#endif
            localKdeDir =  QDir::homePath() + QLatin1Char('/') + QString::fromLatin1(KDE_DEFAULT_HOME) + QLatin1Char('/');
#ifndef _WIN32_WCE
        }
#endif
#else
        localKdeDir =  QDir::homePath() + QLatin1Char('/') + QString::fromLatin1(KDE_DEFAULT_HOME) + QLatin1Char('/');
#endif
    }

    if (localKdeDir != QLatin1String("-/")) {
        localKdeDir = KShell::tildeExpand(localKdeDir);
        addPrefix(localKdeDir);
    }
#endif

#ifdef Q_OS_MAC
    // Adds the "Contents" directory of the current application bundle to
    // the search path. This way bundled resources can be found.
    QDir bundleDir(mac_app_filename());
    if (bundleDir.dirName() == QLatin1String("MacOS")) { // just to be sure we're in a bundle
        bundleDir.cdUp();
        // now dirName should be "Contents". In there we can find our normal
        // dir-structure, beginning with "share"
        addPrefix(bundleDir.absolutePath());
    }
#endif

    QStringList::ConstIterator end(kdedirList.end());
    for (QStringList::ConstIterator it = kdedirList.constBegin();
            it != kdedirList.constEnd(); ++it) {
        const QString dir = KShell::tildeExpand(*it);
        addPrefix(dir);
    }
    // end KDEDIRS

    // begin XDG_CONFIG_XXX
    QStringList xdgdirList;
    QString xdgdirs = readEnvPath("XDG_CONFIG_DIRS");
    if (!xdgdirs.isEmpty()) {
        tokenize(xdgdirList, xdgdirs, QString(QLatin1Char(KPATH_SEPARATOR)));
    } else {
        xdgdirList.clear();
        xdgdirList.append(QString::fromLatin1("/etc/xdg"));
#ifdef Q_OS_WIN
        xdgdirList.append(installPath("kdedir") + QString::fromLatin1("etc/xdg"));
#else
        xdgdirList.append(QFile::decodeName(KDESYSCONFDIR "/xdg"));
#endif
    }

    QString localXdgDir = QStandardPaths::writableLocation(QStandardPaths::GenericConfigLocation);
    addXdgConfigPrefix(localXdgDir);

    for (QStringList::ConstIterator it = xdgdirList.constBegin();
            it != xdgdirList.constEnd(); ++it) {
        QString dir = KShell::tildeExpand(*it);
        addXdgConfigPrefix(dir);
    }
    // end XDG_CONFIG_XXX

    // begin XDG_DATA_XXX
    QStringList kdedirDataDirs;
    for (QStringList::ConstIterator it = kdedirList.constBegin();
            it != kdedirList.constEnd(); ++it) {
        QString dir = *it;
        if (!dir.endsWith(QLatin1Char('/'))) {
            dir += QLatin1Char('/');
        }
        kdedirDataDirs.append(dir + QLatin1String("share/"));
    }

    xdgdirList.clear();
    xdgdirs = readEnvPath("XDG_DATA_DIRS");
    if (!xdgdirs.isEmpty()) {
        tokenize(xdgdirList, xdgdirs, QString(QLatin1Char(KPATH_SEPARATOR)));
        // Ensure the kdedirDataDirs are in there too,
        // otherwise resourceDirs() will add kdedir/share/applications/kde5
        // as returned by installPath(), and that's incorrect.
        Q_FOREACH (const QString &dir, kdedirDataDirs) {
            if (!xdgdirList.contains(dir, cs)) {
                xdgdirList.append(dir);
            }
        }
    } else {
        xdgdirList = kdedirDataDirs;
#ifndef Q_OS_WIN
        xdgdirList.append(QString::fromLatin1("/usr/local/share/"));
        xdgdirList.append(QString::fromLatin1("/usr/share/"));
#endif
    }

    localXdgDir = QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation);
    addXdgDataPrefix(localXdgDir);

    for (QStringList::ConstIterator it = xdgdirList.constBegin();
            it != xdgdirList.constEnd(); ++it) {
        QString dir = KShell::tildeExpand(*it);
        addXdgDataPrefix(dir);
    }
    // end XDG_DATA_XXX

    addResourceType("lib", nullptr, LIB_INSTALL_DIR "/");

    addResourceType("qtplugins", "lib", "plugins");

    uint index = 0;
    while (types_indices[index] != -1) {
        addResourceType(types_string + types_indices[index], nullptr, types_string + types_indices[index + 1], true);
        index += 2;
    }

    // config resource: the XDG paths (xdg/config) have more priority than the KDE4 paths (share/config)
    addResourceType("config", "xdgconf", "/", true);

    addResourceType("exe", "lib", "libexec", true);

    addResourceDir("home", QDir::homePath(), false);

    addResourceType("autostart", "xdgconf-autostart", "/"); // merge them, start with xdg autostart
    addResourceType("autostart", nullptr, "share/autostart"); // KDE ones are higher priority - KDE 5: deprecated, use xdgconf-autostart

    QString appName = QCoreApplication::applicationName();
    addResourceType("appdata", "data", appName + QLatin1Char('/'), true);
}

static QStringList lookupProfiles(const QString &mapFile)
{
    QStringList profiles;

    if (mapFile.isEmpty() || !QFile::exists(mapFile)) {
        profiles << QString::fromLatin1("default");
        return profiles;
    }

    struct passwd *pw = getpwuid(geteuid());
    if (!pw) {
        profiles << QString::fromLatin1("default");
        return profiles; // Not good
    }

    QByteArray user = pw->pw_name;

    gid_t sup_gids[512];
    int sup_gids_nr = getgroups(512, sup_gids);

    KConfig mapCfgFile(mapFile);
    KConfigGroup mapCfg(&mapCfgFile, "Users");
    if (mapCfg.hasKey(user.constData())) {
        profiles = mapCfg.readEntry(user.constData(), QStringList());
        return profiles;
    }

    const KConfigGroup generalGrp(&mapCfgFile, "General");
    const QStringList groups = generalGrp.readEntry("groups", QStringList());

    const KConfigGroup groupsGrp(&mapCfgFile, "Groups");

    for (QStringList::ConstIterator it = groups.begin();
            it != groups.end(); ++it) {
        QByteArray grp = (*it).toUtf8();
        // Check if user is in this group
        struct group *grp_ent = getgrnam(grp);
        if (!grp_ent) {
            continue;
        }
        gid_t gid = grp_ent->gr_gid;
        if (pw->pw_gid == gid) {
            // User is in this group --> add profiles
            profiles += groupsGrp.readEntry(*it, QStringList());
        } else {
            for (int i = 0; i < sup_gids_nr; i++) {
                if (sup_gids[i] == gid) {
                    // User is in this group --> add profiles
                    profiles += groupsGrp.readEntry(*it, QStringList());
                    break;
                }
            }
        }
    }

    if (profiles.isEmpty()) {
        profiles << QString::fromLatin1("default");
    }
    return profiles;
}

extern KDELIBS4SUPPORT_DEPRECATED_EXPORT bool kde_kiosk_admin;

bool KStandardDirs::addCustomized(KConfig *config)
{
    if (!d->m_checkRestrictions) { // there are already customized entries
        return false;    // we just quit and hope they are the right ones
    }

    // save the numbers of config directories. If this changes,
    // we will return true to give KConfig a chance to reparse
    int configdirs = resourceDirs("config").count();

    if (true) {
        // reading the prefixes in
        QString group = QLatin1String("Directories");
        KConfigGroup cg(config, group);

        QString kioskAdmin = cg.readEntry("kioskAdmin");
        if (!kioskAdmin.isEmpty() && !kde_kiosk_admin) {
            int i = kioskAdmin.indexOf(QLatin1Char(':'));
            QString user = kioskAdmin.left(i);
            QString host = kioskAdmin.mid(i + 1);

            KUser thisUser;
            char hostname[ 256 ];
            hostname[ 0 ] = '\0';
            if (!gethostname(hostname, 255)) {
                hostname[sizeof(hostname) - 1] = '\0';
            }

            if ((user == thisUser.loginName()) &&
                    (host.isEmpty() || (host == QLatin1String(hostname)))) {
                kde_kiosk_admin = true;
            }
        }

        bool readProfiles = true;

        if (kde_kiosk_admin && !qgetenv("KDE_KIOSK_NO_PROFILES").isEmpty()) {
            readProfiles = false;
        }

        QString userMapFile = cg.readEntry("userProfileMapFile");
        QString profileDirsPrefix = cg.readEntry("profileDirsPrefix");
        if (!profileDirsPrefix.isEmpty() && !profileDirsPrefix.endsWith(QLatin1Char('/'))) {
            profileDirsPrefix.append(QLatin1Char('/'));
        }

        QStringList profiles;
        if (readProfiles) {
            profiles = lookupProfiles(userMapFile);
        }
        QString profile;

        bool priority = false;
        while (true) {
            KConfigGroup cg(config, group);
            const QStringList list = cg.readEntry("prefixes", QStringList());
            for (QStringList::ConstIterator it = list.begin(); it != list.end(); ++it) {
                addPrefix(*it, priority);
                addXdgConfigPrefix(*it + QLatin1String("/etc/xdg"), priority);
                addXdgDataPrefix(*it + QLatin1String("/share"), priority);
            }
            // If there are no prefixes defined, check if there is a directory
            // for this profile under <profileDirsPrefix>
            if (list.isEmpty() && !profile.isEmpty() && !profileDirsPrefix.isEmpty()) {
                QString dir = profileDirsPrefix + profile;
                addPrefix(dir, priority);
                addXdgConfigPrefix(dir + QLatin1String("/etc/xdg"), priority);
                addXdgDataPrefix(dir + QLatin1String("/share"), priority);
            }

            // iterating over all entries in the group Directories
            // to find entries that start with dir_$type
            const QMap<QString, QString> entries = config->entryMap(group);
            for (QMap<QString, QString>::ConstIterator it2 = entries.begin();
                    it2 != entries.end(); ++it2) {
                const QString key = it2.key();
                if (key.startsWith(QLatin1String("dir_"))) {
                    // generate directory list, there may be more than 1.
                    const QStringList dirs = (*it2).split(QString(QLatin1Char(',')));
                    QStringList::ConstIterator sIt(dirs.begin());
                    QString resType = key.mid(4);
                    for (; sIt != dirs.end(); ++sIt) {
                        addResourceDir(resType.toLatin1(), *sIt, priority);
                    }
                }
            }
            if (profiles.isEmpty()) {
                break;
            }
            profile = profiles.back();
            group = QString::fromLatin1("Directories-%1").arg(profile);
            profiles.pop_back();
            priority = true;
        }
    }

    // Process KIOSK restrictions.
    if (!kde_kiosk_admin || qgetenv("KDE_KIOSK_NO_RESTRICTIONS").isEmpty()) {
        KConfigGroup cg(config, "KDE Resource Restrictions");
        const QMap<QString, QString> entries = cg.entryMap();
        for (QMap<QString, QString>::ConstIterator it2 = entries.begin();
                it2 != entries.end(); ++it2) {
            const QString key = it2.key();
            if (!cg.readEntry(key, true)) {
                d->m_restrictionsActive = true;
                const QByteArray cKey = key.toLatin1();
                d->m_restrictions.insert(cKey, true);
                d->m_dircache.remove(cKey);
                d->m_savelocations.remove(cKey);
            }
        }
    }

    // check if the number of config dirs changed
    bool configDirsChanged = (resourceDirs("config").count() != configdirs);
    // If the config dirs changed, we check kiosk restrictions again.
    d->m_checkRestrictions = configDirsChanged;
    // return true if the number of config dirs changed: reparse config file
    return configDirsChanged;
}

#ifndef KDELIBS4SUPPORT_NO_DEPRECATED
QString KStandardDirs::localkdedir() const
{
    // Return the prefix to use for saving
    return d->m_prefixes.first();
}

QString KStandardDirs::localxdgdatadir() const
{
    // Return the prefix to use for saving
    return d->xdgdata_prefixes.first();
}

QString KStandardDirs::localxdgconfdir() const
{
    // Return the prefix to use for saving
    return d->xdgconf_prefixes.first();
}
#endif // KDELIBS4SUPPORT_NO_DEPRECATED

// just to make code more readable without macros
QString KStandardDirs::locate(const char *type,
                              const QString &filename)
{
    return KGlobal::dirs()->findResource(type, filename);
}

QString KStandardDirs::locateLocal(const char *type,
                                   const QString &filename)
{
    return KGlobal::dirs()->locateLocal(type, filename, true);
}

QString KStandardDirs::locateLocal(const char *type,
                                   const QString &filename, bool createDir)
{
    // try to find slashes. If there are some, we have to
    // create the subdir first
    int slash = filename.lastIndexOf(QLatin1Char('/')) + 1;
    if (!slash) { // only one filename
        return KGlobal::dirs()->saveLocation(type, QString(), createDir) + filename;
    }

    // split path from filename
    QString dir = filename.left(slash);
    QString file = filename.mid(slash);
    return KGlobal::dirs()->saveLocation(type, dir, createDir) + file;
}

bool KStandardDirs::checkAccess(const QString &pathname, int mode)
{
    int accessOK = KDE::access(pathname, mode);
    if (accessOK == 0) {
        return true;    // OK, I can really access the file
    }

    // else
    // if we want to write the file would be created. Check, if the
    // user may write to the directory to create the file.
    if ((mode & W_OK) == 0) {
        return false;    // Check for write access is not part of mode => bail out
    }

    if (!KDE::access(pathname, F_OK)) { // if it already exists
        return false;
    }

    //strip the filename (everything until '/' from the end
    QString dirName(pathname);
    int pos = dirName.lastIndexOf(QLatin1Char('/'));
    if (pos == -1) {
        return false;    // No path in argument. This is evil, we won't allow this
    } else if (pos == 0) { // don't turn e.g. /root into an empty string
        pos = 1;
    }

    dirName.truncate(pos); // strip everything starting from the last '/'

    accessOK = KDE::access(dirName, W_OK);
    // -?- Can I write to the accessed diretory
    if (accessOK == 0) {
        return true;    // Yes
    } else {
        return false;    // No
    }
}

