2 files changed, 112 insertions, 8 deletions

diff --git a/src/corelib/io/qtemporaryfile.cpp b/src/corelib/io/qtemporaryfile.cpp
index bd039c8559..47fa257ae5 100644
--- a/src/corelib/io/qtemporaryfile.cpp
+++ b/src/corelib/io/qtemporaryfile.cpp
@@ -292,14 +292,20 @@ class QTemporaryFileEngine : public QFSFileEngine
     Q_DECLARE_PRIVATE(QFSFileEngine)
 public:
     QTemporaryFileEngine(const QString &file, bool fileIsTemplate = true)
-        : QFSFileEngine(file), filePathIsTemplate(fileIsTemplate)
+        : QFSFileEngine(), filePathIsTemplate(fileIsTemplate)
     {
+        Q_D(QFSFileEngine);
+        d->filePath = file;
+
+        if (!filePathIsTemplate)
+            QFSFileEngine::setFileName(file);
     }
 
     ~QTemporaryFileEngine();
 
     bool isReallyOpen();
     void setFileName(const QString &file);
+    void setFileTemplate(const QString &fileTemplate);
 
     bool open(QIODevice::OpenMode flags);
     bool remove();
@@ -336,6 +342,13 @@ void QTemporaryFileEngine::setFileName(const QString &file)
     QFSFileEngine::setFileName(file);
 }
 
+void QTemporaryFileEngine::setFileTemplate(const QString &fileTemplate)
+{
+    Q_D(QFSFileEngine);
+    if (filePathIsTemplate)
+        d->filePath = fileTemplate;
+}
+
 bool QTemporaryFileEngine::open(QIODevice::OpenMode openMode)
 {
     Q_D(QFSFileEngine);
@@ -382,12 +395,19 @@ bool QTemporaryFileEngine::open(QIODevice::OpenMode openMode)
         return false;
     }
 
+    QString template_ = d->filePath;
     d->filePath = QString::fromLocal8Bit(filename);
-    filePathIsTemplate = false;
     d->nativeInitFileName();
-    d->closeFileHandle = true;
     delete [] filename;
-    return QFSFileEngine::open(openMode);
+
+    if (QFSFileEngine::open(openMode)) {
+        filePathIsTemplate = false;
+        return true;
+    }
+
+    d->filePath = template_;
+    d->nativeFilePath.clear();
+    return false;
 #endif
 }
 
@@ -533,7 +553,8 @@ QTemporaryFile::QTemporaryFile()
 QTemporaryFile::QTemporaryFile(const QString &templateName)
     : QFile(*new QTemporaryFilePrivate, 0)
 {
-    setFileTemplate(templateName);
+    Q_D(QTemporaryFile);
+    d->templateName = templateName;
 }
 
 /*!
@@ -567,7 +588,8 @@ QTemporaryFile::QTemporaryFile(QObject *parent)
 QTemporaryFile::QTemporaryFile(const QString &templateName, QObject *parent)
     : QFile(*new QTemporaryFilePrivate, parent)
 {
-    setFileTemplate(templateName);
+    Q_D(QTemporaryFile);
+    d->templateName = templateName;
 }
 #endif
 
@@ -671,10 +693,10 @@ QString QTemporaryFile::fileTemplate() const
 */
 void QTemporaryFile::setFileTemplate(const QString &name)
 {
-    Q_ASSERT(!isOpen());
     Q_D(QTemporaryFile);
-    fileEngine()->setFileName(name);
     d->templateName = name;
+    if (d->fileEngine)
+        static_cast<QTemporaryFileEngine*>(d->fileEngine)->setFileTemplate(name);
 }
 
 /*!
diff --git a/tests/auto/qtemporaryfile/tst_qtemporaryfile.cpp b/tests/auto/qtemporaryfile/tst_qtemporaryfile.cpp
index 2541b48d88..73486e709b 100644
--- a/tests/auto/qtemporaryfile/tst_qtemporaryfile.cpp
+++ b/tests/auto/qtemporaryfile/tst_qtemporaryfile.cpp
@@ -89,6 +89,8 @@ private slots:
     void renameFdLeak();
     void reOpenThroughQFile();
     void keepOpenMode();
+    void resetTemplateAfterError();
+    void setTemplateAfterOpen();
 
 public:
 };
@@ -472,5 +474,85 @@ void tst_QTemporaryFile::keepOpenMode()
     }
 }
 
+void tst_QTemporaryFile::resetTemplateAfterError()
+{
+    // calling setFileTemplate on a failed open
+
+    QString tempPath = QDir::tempPath();
+
+    QString const fileTemplate("destination/qt_temp_file_test.XXXXXX");
+    QString const fileTemplate2(tempPath + "/qt_temp_file_test.XXXXXX");
+
+    QVERIFY2( QDir(tempPath).exists() || QDir().mkpath(tempPath), "Test precondition" );
+    QVERIFY2( !QFile::exists("destination"), "Test precondition" );
+    QVERIFY2( !QFile::exists(fileTemplate2) || QFile::remove(fileTemplate2), "Test precondition" );
+
+    QFile file(fileTemplate2);
+    QByteArray fileContent("This file is intentionally NOT left empty.");
+
+    QVERIFY( file.open(QIODevice::ReadWrite | QIODevice::Truncate) );
+    QCOMPARE( file.write(fileContent), (qint64)fileContent.size() );
+    QVERIFY( file.flush() );
+
+    QString fileName;
+    {
+        QTemporaryFile temp;
+
+        QVERIFY( temp.fileName().isEmpty() );
+        QVERIFY( !temp.fileTemplate().isEmpty() );
+
+        temp.setFileTemplate( fileTemplate );
+
+        QVERIFY( temp.fileName().isEmpty() );
+        QCOMPARE( temp.fileTemplate(), fileTemplate );
+
+        QVERIFY( !temp.open() );
+
+        QVERIFY( temp.fileName().isEmpty() );
+        QCOMPARE( temp.fileTemplate(), fileTemplate );
+
+        temp.setFileTemplate( fileTemplate2 );
+        QVERIFY( temp.open() );
+
+        fileName = temp.fileName();
+        QVERIFY( QFile::exists(fileName) );
+        QVERIFY( !fileName.isEmpty() );
+        QVERIFY2( fileName != fileTemplate2,
+            ("Generated name shouldn't be same as template: " + fileTemplate2).toLocal8Bit().constData() );
+    }
+
+    QVERIFY( !QFile::exists(fileName) );
+
+    file.seek(0);
+    QCOMPARE( QString(file.readAll()), QString(fileContent) );
+    QVERIFY( file.remove() );
+}
+
+void tst_QTemporaryFile::setTemplateAfterOpen()
+{
+    QTemporaryFile temp;
+
+    QVERIFY( temp.fileName().isEmpty() );
+    QVERIFY( !temp.fileTemplate().isEmpty() );
+
+    QVERIFY( temp.open() );
+
+    QString const fileName = temp.fileName();
+    QString const newTemplate("funny-path/funny-name-XXXXXX.tmp");
+
+    QVERIFY( !fileName.isEmpty() );
+    QVERIFY( QFile::exists(fileName) );
+    QVERIFY( !temp.fileTemplate().isEmpty() );
+    QVERIFY( temp.fileTemplate() != newTemplate );
+
+    temp.close(); // QTemporaryFile::setFileTemplate will assert on isOpen() up to 4.5.2
+    temp.setFileTemplate(newTemplate);
+    QCOMPARE( temp.fileTemplate(), newTemplate );
+
+    QVERIFY( temp.open() );
+    QCOMPARE( temp.fileName(), fileName );
+    QCOMPARE( temp.fileTemplate(), newTemplate );
+}
+
 QTEST_MAIN(tst_QTemporaryFile)
 #include "tst_qtemporaryfile.moc"