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#include "environment.h"

#include <process.h>
#include <iostream>
#include <qdebug.h>
#include <QDir>
#include <QStringList>
#include <QMap>
#include <QDir>
#include <QFile>
#include <QFileInfo>

//#define CONFIGURE_DEBUG_EXECUTE
//#define CONFIGURE_DEBUG_CP_DIR

using namespace std;

#ifdef Q_OS_WIN32
#include <qt_windows.h>
#endif


QT_BEGIN_NAMESPACE

struct CompilerInfo{
    Compiler compiler;
    const char *compilerStr;
    const char *regKey;
    const char *executable;
} compiler_info[] = {
    // The compilers here are sorted in a reversed-preferred order
    {CC_BORLAND, "Borland C++",                                                    0, "bcc32.exe"},
    {CC_MINGW,   "MinGW (Minimalist GNU for Windows)",                             0, "mingw32-gcc.exe"},
    {CC_INTEL,   "Intel(R) C++ Compiler for 32-bit applications",                  0, "icl.exe"}, // xilink.exe, xilink5.exe, xilink6.exe, xilib.exe
    {CC_MSVC6,   "Microsoft (R) 32-bit C/C++ Optimizing Compiler (6.x)",           "Software\\Microsoft\\VisualStudio\\6.0\\Setup\\Microsoft Visual C++\\ProductDir", "cl.exe"}, // link.exe, lib.exe
    {CC_NET2002, "Microsoft (R) 32-bit C/C++ Optimizing Compiler.NET 2002 (7.0)",  "Software\\Microsoft\\VisualStudio\\7.0\\Setup\\VC\\ProductDir", "cl.exe"}, // link.exe, lib.exe
    {CC_NET2003, "Microsoft (R) 32-bit C/C++ Optimizing Compiler.NET 2003 (7.1)",  "Software\\Microsoft\\VisualStudio\\7.1\\Setup\\VC\\ProductDir", "cl.exe"}, // link.exe, lib.exe
    {CC_NET2005, "Microsoft (R) 32-bit C/C++ Optimizing Compiler.NET 2005 (8.0)",  "Software\\Microsoft\\VisualStudio\\SxS\\VC7\\8.0", "cl.exe"}, // link.exe, lib.exe
    {CC_NET2008, "Microsoft (R) 32-bit C/C++ Optimizing Compiler.NET 2008 (9.0)",  "Software\\Microsoft\\VisualStudio\\SxS\\VC7\\9.0", "cl.exe"}, // link.exe, lib.exe
    {CC_UNKNOWN, "Unknown", 0, 0},
};


// Initialize static variables
Compiler Environment::detectedCompiler = CC_UNKNOWN;

/*!
    Returns the pointer to the CompilerInfo for a \a compiler.
*/
CompilerInfo *Environment::compilerInfo(Compiler compiler)
{
    int i = 0;
    while(compiler_info[i].compiler != compiler && compiler_info[i].compiler != CC_UNKNOWN)
        ++i;
    return &(compiler_info[i]);
}

/*!
    Returns the path part of a registry key.
    Ei.
        For a key
            "Software\\Microsoft\\VisualStudio\\8.0\\Setup\\VC\\ProductDir"
        it returns
            "Software\\Microsoft\\VisualStudio\\8.0\\Setup\\VC\\"
*/
QString Environment::keyPath(const QString &rKey)
{
    int idx = rKey.lastIndexOf(QLatin1Char('\\'));
    if (idx == -1)
        return QString();
    return rKey.left(idx + 1);
}

/*!
    Returns the name part of a registry key.
    Ei.
        For a key
            "Software\\Microsoft\\VisualStudio\\8.0\\Setup\\VC\\ProductDir"
        it returns
            "ProductDir"
*/
QString Environment::keyName(const QString &rKey)
{
    int idx = rKey.lastIndexOf(QLatin1Char('\\'));
    if (idx == -1)
        return rKey;

    QString res(rKey.mid(idx + 1));
    if (res == "Default" || res == ".")
        res = "";
    return res;
}

/*!
    Returns a registry keys value in string form.
    If the registry key does not exist, or cannot be accessed, a
    QString() is returned.
*/
QString Environment::readRegistryKey(HKEY parentHandle, const QString &rSubkey)
{
#ifndef Q_OS_WIN32
    return QString();
#else
    QString rSubkeyName = keyName(rSubkey);
    QString rSubkeyPath = keyPath(rSubkey);

    HKEY handle = 0;
    LONG res = RegOpenKeyEx(parentHandle, (wchar_t*)rSubkeyPath.utf16(), 0, KEY_READ, &handle);
    if (res != ERROR_SUCCESS)
        return QString();

    // get the size and type of the value
    DWORD dataType;
    DWORD dataSize;
    res = RegQueryValueEx(handle, (wchar_t*)rSubkeyName.utf16(), 0, &dataType, 0, &dataSize);
    if (res != ERROR_SUCCESS) {
        RegCloseKey(handle);
        return QString();
    }

    // get the value
    QByteArray data(dataSize, 0);
    res = RegQueryValueEx(handle, (wchar_t*)rSubkeyName.utf16(), 0, 0,
                           reinterpret_cast<unsigned char*>(data.data()), &dataSize);
    if (res != ERROR_SUCCESS) {
        RegCloseKey(handle);
        return QString();
    }

    QString result;
    switch (dataType) {
        case REG_EXPAND_SZ:
        case REG_SZ: {
            result = QString::fromWCharArray(((const wchar_t *)data.constData()));
            break;
        }

        case REG_MULTI_SZ: {
            QStringList l;
            int i = 0;
            for (;;) {
                QString s = QString::fromWCharArray((const wchar_t *)data.constData() + i);
                i += s.length() + 1;

                if (s.isEmpty())
                    break;
                l.append(s);
            }
            result = l.join(", ");
            break;
        }

        case REG_NONE:
        case REG_BINARY: {
            result = QString::fromWCharArray((const wchar_t *)data.constData(), data.size() / 2);
            break;
        }

        case REG_DWORD_BIG_ENDIAN:
        case REG_DWORD: {
            Q_ASSERT(data.size() == sizeof(int));
            int i;
            memcpy((char*)&i, data.constData(), sizeof(int));
            result = QString::number(i);
            break;
        }

        default:
            qWarning("QSettings: unknown data %d type in windows registry", dataType);
            break;
    }

    RegCloseKey(handle);
    return result;
#endif
}

/*!
    Returns the qmakespec for the compiler detected on the system.
*/
QString Environment::detectQMakeSpec()
{
    QString spec;
    switch (detectCompiler()) {
    case CC_NET2008:
        spec = "win32-msvc2008";
        break;
    case CC_NET2005:
        spec = "win32-msvc2005";
        break;
    case CC_NET2003:
        spec = "win32-msvc2003";
        break;
    case CC_NET2002:
        spec = "win32-msvc2002";
        break;
    case CC_MSVC4:
    case CC_MSVC5:
    case CC_MSVC6:
        spec = "win32-msvc";
        break;
    case CC_INTEL:
        spec = "win32-icc";
        break;
    case CC_MINGW:
        spec = "win32-g++";
        break;
    case CC_BORLAND:
        spec = "win32-borland";
        break;
    default:
        break;
    }

    return spec;
}

/*!
    Returns the enum of the compiler which was detected on the system.
    The compilers are detected in the order as entered into the
    compiler_info list.

    If more than one compiler is found, CC_UNKNOWN is returned.
*/
Compiler Environment::detectCompiler()
{
#ifndef Q_OS_WIN32
    return MSVC6; // Always generate MSVC 6.0 versions on other platforms
#else
    if(detectedCompiler != CC_UNKNOWN)
        return detectedCompiler;

    int installed = 0;

    // Check for compilers in registry first, to see which version is in PATH
    QString paths = qgetenv("PATH");
    QStringList pathlist = paths.toLower().split(";");
    for(int i = 0; compiler_info[i].compiler; ++i) {
        QString productPath = readRegistryKey(HKEY_LOCAL_MACHINE, compiler_info[i].regKey).toLower();
        if (productPath.length()) {
            QStringList::iterator it;
            for(it = pathlist.begin(); it != pathlist.end(); ++it) {
                if((*it).contains(productPath)) {
                    ++installed;
                    detectedCompiler = compiler_info[i].compiler;
                    break;
                }
            }
        }
    }

    // Now just go looking for the executables, and accept any executable as the lowest version
    if (!installed) {
        for(int i = 0; compiler_info[i].compiler; ++i) {
            QString executable = QString(compiler_info[i].executable).toLower();
            if (executable.length() && Environment::detectExecutable(executable)) {
                ++installed;
                detectedCompiler = compiler_info[i].compiler;
                break;
            }
        }
    }

    if (installed > 1) {
        cout << "Found more than one known compiler! Using \"" << compilerInfo(detectedCompiler)->compilerStr << "\"" << endl;
        detectedCompiler = CC_UNKNOWN;
    }
    return detectedCompiler;
#endif
};

/*!
    Returns true if the \a executable could be loaded, else false.
    This means that the executable either is in the current directory
    or in the PATH.
*/
bool Environment::detectExecutable(const QString &executable)
{
    PROCESS_INFORMATION procInfo;
    memset(&procInfo, 0, sizeof(procInfo));

    STARTUPINFO startInfo;
    memset(&startInfo, 0, sizeof(startInfo));
    startInfo.cb = sizeof(startInfo);

    bool couldExecute = CreateProcess(0, (wchar_t*)executable.utf16(),
                                      0, 0, false,
                                      CREATE_NO_WINDOW | CREATE_SUSPENDED,
                                      0, 0, &startInfo, &procInfo);

    if (couldExecute) {
        CloseHandle(procInfo.hThread);
        TerminateProcess(procInfo.hProcess, 0);
        CloseHandle(procInfo.hProcess);
    }
    return couldExecute;
}

/*!
    Creates a commandling from \a program and it \a arguments,
    escaping characters that needs it.
*/
static QString qt_create_commandline(const QString &program, const QStringList &arguments)
{
    QString programName = program;
    if (!programName.startsWith("\"") && !programName.endsWith("\"") && programName.contains(" "))
        programName = "\"" + programName + "\"";
    programName.replace("/", "\\");

    QString args;
    // add the prgram as the first arrg ... it works better
    args = programName + " ";
    for (int i=0; i<arguments.size(); ++i) {
        QString tmp = arguments.at(i);
        // in the case of \" already being in the string the \ must also be escaped
        tmp.replace( "\\\"", "\\\\\"" );
        // escape a single " because the arguments will be parsed
        tmp.replace( "\"", "\\\"" );
        if (tmp.isEmpty() || tmp.contains(' ') || tmp.contains('\t')) {
            // The argument must not end with a \ since this would be interpreted
            // as escaping the quote -- rather put the \ behind the quote: e.g.
            // rather use "foo"\ than "foo\"
            QString endQuote("\"");
            int i = tmp.length();
            while (i>0 && tmp.at(i-1) == '\\') {
                --i;
                endQuote += "\\";
            }
            args += QString(" \"") + tmp.left(i) + endQuote;
        } else {
            args += ' ' + tmp;
        }
    }
    return args;
}

/*!
    Creates a QByteArray of the \a environment.
*/
static QByteArray qt_create_environment(const QStringList &environment)
{
    QByteArray envlist;
    if (environment.isEmpty())
        return envlist;

    int pos = 0;
    // add PATH if necessary (for DLL loading)
    QByteArray path = qgetenv("PATH");
    if (environment.filter(QRegExp("^PATH=",Qt::CaseInsensitive)).isEmpty() && !path.isNull()) {
            QString tmp = QString(QLatin1String("PATH=%1")).arg(QString::fromLocal8Bit(path));
            uint tmpSize = sizeof(wchar_t) * (tmp.length() + 1);
            envlist.resize(envlist.size() + tmpSize);
            memcpy(envlist.data() + pos, tmp.utf16(), tmpSize);
            pos += tmpSize;
    }
    // add the user environment
    for (QStringList::ConstIterator it = environment.begin(); it != environment.end(); it++ ) {
            QString tmp = *it;
            uint tmpSize = sizeof(wchar_t) * (tmp.length() + 1);
            envlist.resize(envlist.size() + tmpSize);
            memcpy(envlist.data() + pos, tmp.utf16(), tmpSize);
            pos += tmpSize;
    }
    // add the 2 terminating 0 (actually 4, just to be on the safe side)
    envlist.resize(envlist.size() + 4);
    envlist[pos++] = 0;
    envlist[pos++] = 0;
    envlist[pos++] = 0;
    envlist[pos++] = 0;

    return envlist;
}

/*!
    Executes the command described in \a arguments, in the
    environment inherited from the parent process, with the
    \a additionalEnv settings applied.
    \a removeEnv removes the specified environment variables from
    the environment of the executed process.

    Returns the exit value of the process, or -1 if the command could
    not be executed.

    This function uses _(w)spawnvpe to spawn a process by searching
    through the PATH environment variable.
*/
int Environment::execute(QStringList arguments, const QStringList &additionalEnv, const QStringList &removeEnv)
{
#ifdef CONFIGURE_DEBUG_EXECUTE
    qDebug() << "About to Execute: " << arguments;
    qDebug() << "   " << QDir::currentPath();
    qDebug() << "   " << additionalEnv;
    qDebug() << "   " << removeEnv;
#endif
    // Create the full environment from the current environment and
    // the additionalEnv strings, then remove all variables defined
    // in removeEnv
    QMap<QString, QString> fullEnvMap;
    LPWSTR envStrings = GetEnvironmentStrings();
    if (envStrings) {
        int strLen = 0;
        for (LPWSTR envString = envStrings; *(envString); envString += strLen + 1) {
            strLen = wcslen(envString);
            QString str = QString((const QChar*)envString, strLen);
            if (!str.startsWith("=")) { // These are added by the system
                int sepIndex = str.indexOf('=');
                fullEnvMap.insert(str.left(sepIndex).toUpper(), str.mid(sepIndex +1));
            }
        }
    }
    FreeEnvironmentStrings(envStrings);

    // Add additionalEnv variables
    for (int i = 0; i < additionalEnv.count(); ++i) {
        const QString &str = additionalEnv.at(i);
        int sepIndex = str.indexOf('=');
        fullEnvMap.insert(str.left(sepIndex).toUpper(), str.mid(sepIndex +1));
    }

    // Remove removeEnv variables
    for (int j = 0; j < removeEnv.count(); ++j)
        fullEnvMap.remove(removeEnv.at(j).toUpper());

    // Add all variables to a QStringList
    QStringList fullEnv;
    QMapIterator<QString, QString> it(fullEnvMap);
    while (it.hasNext()) {
        it.next();
        fullEnv += QString(it.key() + "=" + it.value());
    }

    // ----------------------------
    QString program = arguments.takeAt(0);
    QString args = qt_create_commandline(program, arguments);
    QByteArray envlist = qt_create_environment(fullEnv);

    DWORD exitCode = -1;
    PROCESS_INFORMATION procInfo;
    memset(&procInfo, 0, sizeof(procInfo));

    STARTUPINFO startInfo;
    memset(&startInfo, 0, sizeof(startInfo));
    startInfo.cb = sizeof(startInfo);

    bool couldExecute = CreateProcess(0, (wchar_t*)args.utf16(),
                                      0, 0, true, CREATE_UNICODE_ENVIRONMENT,
                                      envlist.isEmpty() ? 0 : envlist.data(),
                                      0, &startInfo, &procInfo);

    if (couldExecute) {
        WaitForSingleObject(procInfo.hProcess, INFINITE);
        GetExitCodeProcess(procInfo.hProcess, &exitCode);
        CloseHandle(procInfo.hThread);
        CloseHandle(procInfo.hProcess);
    }


    if (exitCode == -1) {
        switch(GetLastError()) {
        case E2BIG:
            cerr << "execute: Argument list exceeds 1024 bytes" << endl;
            foreach(QString arg, arguments)
                cerr << "   (" << arg.toLocal8Bit().constData() << ")" << endl;
            break;
        case ENOENT:
            cerr << "execute: File or path is not found (" << program.toLocal8Bit().constData() << ")" << endl;
            break;
        case ENOEXEC:
            cerr << "execute: Specified file is not executable or has invalid executable-file format (" << program.toLocal8Bit().constData() << ")" << endl;
            break;
        case ENOMEM:
            cerr << "execute: Not enough memory is available to execute new process." << endl;
            break;
        default:
            cerr << "execute: Unknown error" << endl;
            foreach(QString arg, arguments)
                cerr << "   (" << arg.toLocal8Bit().constData() << ")" << endl;
            break;
        }
    }
    return exitCode;
}

bool Environment::cpdir(const QString &srcDir, const QString &destDir)
{
    QString cleanSrcName = QDir::cleanPath(srcDir);
    QString cleanDstName = QDir::cleanPath(destDir);
#ifdef CONFIGURE_DEBUG_CP_DIR
    qDebug() << "Attempt to cpdir " << cleanSrcName << "->" << cleanDstName;
#endif
    if(!QFile::exists(cleanDstName) && !QDir().mkpath(cleanDstName)) {
	qDebug() << "cpdir: Failure to create " << cleanDstName;
	return false;
    }

    bool result = true;
    QDir dir = QDir(cleanSrcName);
    QFileInfoList allEntries = dir.entryInfoList(QDir::AllDirs | QDir::Files | QDir::NoDotAndDotDot);
    for (int i = 0; result && (i < allEntries.count()); ++i) {
        QFileInfo entry = allEntries.at(i);
	bool intermediate = true;
        if (entry.isDir()) {
            intermediate = cpdir(QString("%1/%2").arg(cleanSrcName).arg(entry.fileName()),
                            QString("%1/%2").arg(cleanDstName).arg(entry.fileName()));
        } else {
            QString destFile = QString("%1/%2").arg(cleanDstName).arg(entry.fileName());
#ifdef CONFIGURE_DEBUG_CP_DIR
	    qDebug() << "About to cp (file)" << entry.absoluteFilePath() << "->" << destFile;
#endif
	    QFile::remove(destFile);
            intermediate = QFile::copy(entry.absoluteFilePath(), destFile);
            SetFileAttributes((wchar_t*)destFile.utf16(), FILE_ATTRIBUTE_NORMAL);
        }
	if(!intermediate) {
	    qDebug() << "cpdir: Failure for " << entry.fileName() << entry.isDir();
	    result = false;
	}
    }
    return result;
}

bool Environment::rmdir(const QString &name)
{
    bool result = true;
    QString cleanName = QDir::cleanPath(name);

    QDir dir = QDir(cleanName);
    QFileInfoList allEntries = dir.entryInfoList(QDir::AllDirs | QDir::Files | QDir::NoDotAndDotDot);
    for (int i = 0; result && (i < allEntries.count()); ++i) {
        QFileInfo entry = allEntries.at(i);
        if (entry.isDir()) {
            result &= rmdir(entry.absoluteFilePath());
        } else {
            result &= QFile::remove(entry.absoluteFilePath());
        }
    }
    result &= dir.rmdir(cleanName);
    return result;
}

QT_END_NAMESPACE
