econd half of the crash fix for codecs on Symbian

Ensure that we do not try to use any codecs if we don't have a
cleanup stack available on Symbian.

Task-number: QT-3255
Reviewed-by: Iain

2 files changed, 37 insertions, 2 deletions

diff --git a/src/corelib/codecs/qtextcodec.cpp b/src/corelib/codecs/qtextcodec.cpp
index 1a08cca1cb..18538e342e 100644
--- a/src/corelib/codecs/qtextcodec.cpp
+++ b/src/corelib/codecs/qtextcodec.cpp
@@ -103,6 +103,7 @@ Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
     (QTextCodecFactoryInterface_iid, QLatin1String("/codecs")))
 #endif
 
+
 static char qtolower(register char c)
 { if (c >= 'A' && c <= 'Z') return c + 0x20; return c; }
 static bool qisalnum(register char c)
@@ -217,6 +218,19 @@ QTextCodecCleanup::~QTextCodecCleanup()
 
 Q_GLOBAL_STATIC(QTextCodecCleanup, createQTextCodecCleanup)
 
+bool QTextCodec::validCodecs()
+{
+#ifdef Q_OS_SYMBIAN
+    // If we don't have a trap handler, we're outside of the main() function,
+    // ie. in global constructors or destructors. Don't use codecs in this
+    // case as it would lead to crashes because we don't have a cleanup stack on Symbian
+    return (User::TrapHandler() != NULL);
+#else
+    return true;
+#endif
+}
+
+
 #if defined(Q_OS_WIN32) || defined(Q_OS_WINCE)
 class QWindowsLocalCodec: public QTextCodec
 {
@@ -672,6 +686,9 @@ static void setup()
         return;
 
 #ifdef Q_OS_SYMBIAN
+    // If we don't have a trap handler, we're outside of the main() function,
+    // ie. in global constructors or destructors. Don't create codecs in this
+    // case as it would lead to crashes because of a missing cleanup stack on Symbian
     if (User::TrapHandler() == NULL)
         return;
 #endif
@@ -969,6 +986,9 @@ QTextCodec *QTextCodec::codecForName(const QByteArray &name)
 #endif
     setup();
 
+    if (!validCodecs())
+        return 0;
+
     static QHash <QByteArray, QTextCodec *> cache;
     if (clearCaches & 0x1) {
         cache.clear();
@@ -1010,6 +1030,9 @@ QTextCodec* QTextCodec::codecForMib(int mib)
 #endif
     setup();
 
+    if (!validCodecs())
+        return 0;
+
     static QHash <int, QTextCodec *> cache;
     if (clearCaches & 0x2) {
         cache.clear();
@@ -1057,6 +1080,10 @@ QList<QByteArray> QTextCodec::availableCodecs()
     setup();
 
     QList<QByteArray> codecs;
+
+    if (!validCodecs())
+        return codecs;
+
     for (int i = 0; i < all->size(); ++i) {
         codecs += all->at(i)->name();
         codecs += all->at(i)->aliases();
@@ -1095,6 +1122,10 @@ QList<int> QTextCodec::availableMibs()
     setup();
 
     QList<int> codecs;
+
+    if (!validCodecs())
+        return codecs;
+
     for (int i = 0; i < all->size(); ++i)
         codecs += all->at(i)->mibEnum();
 
@@ -1145,6 +1176,9 @@ void QTextCodec::setCodecForLocale(QTextCodec *c)
 
 QTextCodec* QTextCodec::codecForLocale()
 {
+    if (!validCodecs())
+        return 0;
+
     if (localeMapper)
         return localeMapper;
 
diff --git a/src/corelib/codecs/qtextcodec.h b/src/corelib/codecs/qtextcodec.h
index 169fe82dfd..e82f8a4172 100644
--- a/src/corelib/codecs/qtextcodec.h
+++ b/src/corelib/codecs/qtextcodec.h
@@ -145,12 +145,13 @@ public:
 private:
     friend class QTextCodecCleanup;
     static QTextCodec *cftr;
+    static bool validCodecs();
 };
 Q_DECLARE_OPERATORS_FOR_FLAGS(QTextCodec::ConversionFlags)
 
-inline QTextCodec* QTextCodec::codecForTr() { return cftr; }
+        inline QTextCodec* QTextCodec::codecForTr() { return validCodecs() ? cftr : 0; }
 inline void QTextCodec::setCodecForTr(QTextCodec *c) { cftr = c; }
-inline QTextCodec* QTextCodec::codecForCStrings() { return QString::codecForCStrings; }
+inline QTextCodec* QTextCodec::codecForCStrings() { return validCodecs() ? QString::codecForCStrings : 0; }
 inline void QTextCodec::setCodecForCStrings(QTextCodec *c) { QString::codecForCStrings = c; }
 
 class Q_CORE_EXPORT QTextEncoder {