loplugin:cstylecast: deal with remaining pointer casts

Change-Id: I07bf1403e6b992807541a499b786d47f835b2f81

25 files changed, 137 insertions, 137 deletions

diff --git a/vcl/unx/generic/app/i18n_cb.cxx b/vcl/unx/generic/app/i18n_cb.cxx
index 4f3b910ee6af..8de3dc88bc52 100644
--- a/vcl/unx/generic/app/i18n_cb.cxx
+++ b/vcl/unx/generic/app/i18n_cb.cxx
@@ -62,7 +62,7 @@ PreeditDoneCallback ( XIC, XPointer client_data, XPointer )
      if (pPreeditData->eState == ePreeditStatusActive )
     {
         if( pPreeditData->pFrame )
-            pPreeditData->pFrame->CallCallback( SALEVENT_ENDEXTTEXTINPUT, (void*)NULL );
+            pPreeditData->pFrame->CallCallback( SALEVENT_ENDEXTTEXTINPUT, nullptr );
     }
     pPreeditData->eState = ePreeditStatusStartPending;
 }
@@ -94,11 +94,11 @@ Preedit_DeleteText(preedit_text_t *ptext, int from, int howmuch)
         if (to < (int)ptext->nLength)
     {
         // cut out of the middle of the text
-        memmove( (void*)(ptext->pUnicodeBuffer + from),
-                (void*)(ptext->pUnicodeBuffer + to),
+        memmove( static_cast<void*>(ptext->pUnicodeBuffer + from),
+                static_cast<void*>(ptext->pUnicodeBuffer + to),
                 (ptext->nLength - to) * sizeof(sal_Unicode));
-        memmove( (void*)(ptext->pCharStyle + from),
-                (void*)(ptext->pCharStyle + to),
+        memmove( static_cast<void*>(ptext->pCharStyle + from),
+                static_cast<void*>(ptext->pCharStyle + to),
                 (ptext->nLength - to) * sizeof(XIMFeedback));
         ptext->nLength -= howmuch;
       }
@@ -127,9 +127,9 @@ enlarge_buffer ( preedit_text_t *ptext, int nnewlimit )
         nnewsize *= 2;
 
       ptext->nSize = nnewsize;
-      ptext->pUnicodeBuffer = static_cast<sal_Unicode*>(realloc((void*)ptext->pUnicodeBuffer,
+      ptext->pUnicodeBuffer = static_cast<sal_Unicode*>(realloc(static_cast<void*>(ptext->pUnicodeBuffer),
             nnewsize * sizeof(sal_Unicode)));
-      ptext->pCharStyle = static_cast<XIMFeedback*>(realloc((void*)ptext->pCharStyle,
+      ptext->pCharStyle = static_cast<XIMFeedback*>(realloc(static_cast<void*>(ptext->pCharStyle),
             nnewsize * sizeof(XIMFeedback)));
 }
 
@@ -203,19 +203,19 @@ Preedit_InsertText(preedit_text_t *pText, XIMText *pInsertText, int where)
     int to      = where + nInsertTextLength;
     int howmany = pText->nLength - where;
 
-    memmove((void*)(pText->pUnicodeBuffer + to),
-          (void*)(pText->pUnicodeBuffer + from),
+    memmove(static_cast<void*>(pText->pUnicodeBuffer + to),
+          static_cast<void*>(pText->pUnicodeBuffer + from),
             howmany * sizeof(sal_Unicode));
-    memmove((void*)(pText->pCharStyle + to),
-            (void*)(pText->pCharStyle + from),
+    memmove(static_cast<void*>(pText->pCharStyle + to),
+            static_cast<void*>(pText->pCharStyle + from),
             howmany * sizeof(XIMFeedback));
 
     to = from;
     howmany = nInsertTextLength;
 
-    memcpy((void*)(pText->pUnicodeBuffer + to), (void*)pInsertTextString,
+    memcpy(static_cast<void*>(pText->pUnicodeBuffer + to), static_cast<void*>(pInsertTextString),
            howmany * sizeof(sal_Unicode));
-    memcpy((void*)(pText->pCharStyle + to), (void*)pInsertTextCharStyle,
+    memcpy(static_cast<void*>(pText->pCharStyle + to), static_cast<void*>(pInsertTextCharStyle),
             howmany * sizeof(XIMFeedback));
 
     pText->nLength += howmany;
@@ -262,7 +262,7 @@ Preedit_FeedbackToSAL ( XIMFeedback* pfeedback, int nlength, std::vector<sal_uIn
         psalattr = &rSalAttr[0];
     }
       else
-        return (sal_uInt16*)NULL;
+        return nullptr;
 
       for (int npos = 0; npos < nlength; npos++)
     {
@@ -370,9 +370,9 @@ PreeditDrawCallback(XIC ic, XPointer client_data,
     pPreeditData->aInputEv.mbOnlyCursor = False;
 
     if ( pPreeditData->eState == ePreeditStatusActive && pPreeditData->pFrame )
-        pPreeditData->pFrame->CallCallback(SALEVENT_EXTTEXTINPUT, (void*)&pPreeditData->aInputEv);
+        pPreeditData->pFrame->CallCallback(SALEVENT_EXTTEXTINPUT, static_cast<void*>(&pPreeditData->aInputEv));
     if (pPreeditData->aText.nLength == 0 && pPreeditData->pFrame )
-        pPreeditData->pFrame->CallCallback( SALEVENT_ENDEXTTEXTINPUT, (void*)NULL );
+        pPreeditData->pFrame->CallCallback( SALEVENT_ENDEXTTEXTINPUT, nullptr );
 
     if (pPreeditData->aText.nLength == 0)
         pPreeditData->eState = ePreeditStatusStartPending;
@@ -390,7 +390,7 @@ GetPreeditSpotLocation(XIC ic, XPointer client_data)
     preedit_data_t* pPreeditData = reinterpret_cast<preedit_data_t*>(client_data);
 
     if( pPreeditData->pFrame )
-        pPreeditData->pFrame->CallCallback(SALEVENT_EXTTEXTINPUTPOS, (void*)&mPosEvent);
+        pPreeditData->pFrame->CallCallback(SALEVENT_EXTTEXTINPUTPOS, static_cast<void*>(&mPosEvent));
 
     XPoint point;
     point.x = mPosEvent.mnX + mPosEvent.mnWidth;
diff --git a/vcl/unx/generic/app/i18n_ic.cxx b/vcl/unx/generic/app/i18n_ic.cxx
index 2bd02caa5b84..c96b5adfdf5f 100644
--- a/vcl/unx/generic/app/i18n_ic.cxx
+++ b/vcl/unx/generic/app/i18n_ic.cxx
@@ -50,7 +50,7 @@ static void sendEmptyCommit( SalFrame* pFrame )
     aEmptyEv.mnCursorPos        = 0;
     aEmptyEv.mnCursorFlags      = 0;
     aEmptyEv.mbOnlyCursor       = False;
-    pFrame->CallCallback( SALEVENT_EXTTEXTINPUT, (void*)&aEmptyEv );
+    pFrame->CallCallback( SALEVENT_EXTTEXTINPUT, static_cast<void*>(&aEmptyEv) );
     if( ! aDel.isDeleted() )
         pFrame->CallCallback( SALEVENT_ENDEXTTEXTINPUT, NULL );
 }
@@ -128,7 +128,7 @@ get_font_set( Display *p_display )
 
 SalI18N_InputContext::SalI18N_InputContext ( SalFrame *pFrame ) :
         mbUseable( True ),
-        maContext( (XIC)NULL ),
+        maContext( nullptr ),
         mnSupportedStatusStyle(
                                XIMStatusCallbacks   |
                                XIMStatusNothing     |
@@ -262,7 +262,7 @@ SalI18N_InputContext::SalI18N_InputContext ( SalFrame *pFrame ) :
             {
                 // spot location
                 SalExtTextInputPosEvent aPosEvent;
-                pFrame->CallCallback(SALEVENT_EXTTEXTINPUTPOS, (void*)&aPosEvent);
+                pFrame->CallCallback(SALEVENT_EXTTEXTINPUTPOS, static_cast<void*>(&aPosEvent));
 
                 static XPoint aSpot;
                 aSpot.x = aPosEvent.mnX + aPosEvent.mnWidth;
@@ -356,7 +356,7 @@ SalI18N_InputContext::SalI18N_InputContext ( SalFrame *pFrame ) :
 
     if ( maContext != NULL)
     {
-        maDestroyCallback.callback    = (XIMProc)IC_IMDestroyCallback;
+        maDestroyCallback.callback    = static_cast<XIMProc>(IC_IMDestroyCallback);
         maDestroyCallback.client_data = reinterpret_cast<XPointer>(this);
         XSetICValues( maContext,
                       XNDestroyCallback,      &maDestroyCallback,
@@ -541,8 +541,8 @@ SalI18N_InputContext::CommitKeyEvent(sal_Unicode* pText, sal_Size nLength)
         aTextEvent.mnCursorFlags = 0;
         aTextEvent.mbOnlyCursor  = False;
 
-        maClientData.pFrame->CallCallback(SALEVENT_EXTTEXTINPUT,    (void*)&aTextEvent);
-        maClientData.pFrame->CallCallback(SALEVENT_ENDEXTTEXTINPUT, (void*)NULL);
+        maClientData.pFrame->CallCallback(SALEVENT_EXTTEXTINPUT,    static_cast<void*>(&aTextEvent));
+        maClientData.pFrame->CallCallback(SALEVENT_ENDEXTTEXTINPUT, nullptr);
     }
 #if OSL_DEBUG_LEVEL > 1
     else
@@ -559,7 +559,7 @@ SalI18N_InputContext::UpdateSpotLocation()
         return -1;
 
     SalExtTextInputPosEvent aPosEvent;
-    maClientData.pFrame->CallCallback(SALEVENT_EXTTEXTINPUTPOS, (void*)&aPosEvent);
+    maClientData.pFrame->CallCallback(SALEVENT_EXTTEXTINPUTPOS, static_cast<void*>(&aPosEvent));
 
     XPoint aSpot;
     aSpot.x = aPosEvent.mnX + aPosEvent.mnWidth;
diff --git a/vcl/unx/generic/app/i18n_im.cxx b/vcl/unx/generic/app/i18n_im.cxx
index ce8dee888aae..d9dfc831e6bb 100644
--- a/vcl/unx/generic/app/i18n_im.cxx
+++ b/vcl/unx/generic/app/i18n_im.cxx
@@ -245,11 +245,11 @@ SalI18N_InputMethod::PosixLocale()
 
 SalI18N_InputMethod::SalI18N_InputMethod( )
     : mbUseable( bUseInputMethodDefault )
-    , maMethod( (XIM)NULL )
-    , mpStyles( (XIMStyles*)NULL )
+    , maMethod( nullptr )
+    , mpStyles( nullptr )
 {
-    maDestroyCallback.callback = (XIMProc)NULL;
-    maDestroyCallback.client_data = (XPointer)NULL;
+    maDestroyCallback.callback = nullptr;
+    maDestroyCallback.client_data = nullptr;
     const char *pUseInputMethod = getenv( "SAL_USEINPUTMETHOD" );
     if ( pUseInputMethod != NULL )
         mbUseable = pUseInputMethod[0] != '\0' ;
@@ -338,7 +338,7 @@ SalI18N_InputMethod::CreateMethod ( Display *pDisplay )
     {
         maMethod = XOpenIM(pDisplay, NULL, NULL, NULL);
 
-        if ((maMethod == (XIM)NULL) && (getenv("XMODIFIERS") != NULL))
+        if ((maMethod == nullptr) && (getenv("XMODIFIERS") != NULL))
         {
                 OUString envVar("XMODIFIERS");
                 osl_clearEnvironment(envVar.pData);
@@ -346,7 +346,7 @@ SalI18N_InputMethod::CreateMethod ( Display *pDisplay )
                 maMethod = XOpenIM(pDisplay, NULL, NULL, NULL);
         }
 
-        if ( maMethod != (XIM)NULL )
+        if ( maMethod != nullptr )
         {
             if (   XGetIMValues(maMethod, XNQueryInputStyle, &mpStyles, NULL)
                 != NULL)
@@ -367,7 +367,7 @@ SalI18N_InputMethod::CreateMethod ( Display *pDisplay )
         fprintf(stderr, "input method creation failed\n");
     #endif
 
-    maDestroyCallback.callback    = (XIMProc)IM_IMDestroyCallback;
+    maDestroyCallback.callback    = static_cast<XIMProc>(IM_IMDestroyCallback);
     maDestroyCallback.client_data = reinterpret_cast<XPointer>(this);
     if (mbUseable && maMethod != NULL)
         XSetIMValues(maMethod, XNDestroyCallback, &maDestroyCallback, NULL);
diff --git a/vcl/unx/generic/app/i18n_keysym.cxx b/vcl/unx/generic/app/i18n_keysym.cxx
index 2ce0e08ef439..f464c498e689 100644
--- a/vcl/unx/generic/app/i18n_keysym.cxx
+++ b/vcl/unx/generic/app/i18n_keysym.cxx
@@ -307,11 +307,11 @@ const keymap_t* p_keymap[INITIAL_KEYMAPS] = {
     &keymap00, &keymap01, &keymap02, &keymap03,                         /* 00 -- 03 */
     &keymap04, &keymap05, &keymap06, &keymap07,                         /* 04 -- 07 */
     &keymap08, &keymap09, &keymap10, &keymap11,                         /* 08 -- 11 */
-    &keymap12, &keymap13, &keymap14, (keymap_t*)NULL,                   /* 12 -- 15 */
-    (keymap_t*)NULL, (keymap_t*)NULL, (keymap_t*)NULL, &keymap19,       /* 16 -- 19 */
-    (keymap_t*)NULL, (keymap_t*)NULL, (keymap_t*)NULL, (keymap_t*)NULL, /* 20 -- 23 */
-    (keymap_t*)NULL, (keymap_t*)NULL, (keymap_t*)NULL, (keymap_t*)NULL, /* 24 -- 27 */
-    (keymap_t*)NULL, (keymap_t*)NULL, (keymap_t*)NULL, (keymap_t*)NULL, /* 28 -- 31 */
+    &keymap12, &keymap13, &keymap14, nullptr,                   /* 12 -- 15 */
+    nullptr, nullptr, nullptr, &keymap19,       /* 16 -- 19 */
+    nullptr, nullptr, nullptr, nullptr, /* 20 -- 23 */
+    nullptr, nullptr, nullptr, nullptr, /* 24 -- 27 */
+    nullptr, nullptr, nullptr, nullptr, /* 28 -- 31 */
     &keymap32                                                           /* 32 */
 };
 
diff --git a/vcl/unx/generic/app/i18n_status.cxx b/vcl/unx/generic/app/i18n_status.cxx
index 36f0ebcf6254..bb77762ad2d1 100644
--- a/vcl/unx/generic/app/i18n_status.cxx
+++ b/vcl/unx/generic/app/i18n_status.cxx
@@ -198,7 +198,7 @@ Point XIMStatusWindow::updatePosition()
         const SystemEnvData* pParentEnvData = m_pLastParent->GetSystemData();
 
         SalExtTextInputPosEvent aPosEvent;
-        m_pLastParent->CallCallback( SALEVENT_EXTTEXTINPUTPOS, (void*)&aPosEvent );
+        m_pLastParent->CallCallback( SALEVENT_EXTTEXTINPUTPOS, static_cast<void*>(&aPosEvent) );
         int x, y;
         ::Window aChild;
         XTranslateCoordinates( static_cast<Display*>(pParentEnvData->pDisplay),
diff --git a/vcl/unx/generic/app/saldisp.cxx b/vcl/unx/generic/app/saldisp.cxx
index d95e30bca6d7..b8e266cb9ef3 100644
--- a/vcl/unx/generic/app/saldisp.cxx
+++ b/vcl/unx/generic/app/saldisp.cxx
@@ -559,7 +559,7 @@ void SalDisplay::Init()
     for( Cursor & aCsr : aPointerCache_ )
         aCsr = None;
 
-    mpFactory           = (AttributeProvider*)NULL;
+    mpFactory           = nullptr;
     m_bXinerama         = false;
 
     int nDisplayScreens = ScreenCount( pDisp_ );
@@ -2354,7 +2354,7 @@ SalVisual::SalVisual()
 
 SalVisual::SalVisual( const XVisualInfo* pXVI )
 {
-    *(XVisualInfo*)this = *pXVI;
+    *static_cast<XVisualInfo*>(this) = *pXVI;
     if( GetClass() == TrueColor )
     {
         nRedShift_      = sal_Shift( red_mask );
diff --git a/vcl/unx/generic/app/salinst.cxx b/vcl/unx/generic/app/salinst.cxx
index 9c00f6d5a468..47b64290e40e 100644
--- a/vcl/unx/generic/app/salinst.cxx
+++ b/vcl/unx/generic/app/salinst.cxx
@@ -162,7 +162,7 @@ void* X11SalInstance::GetConnectionIdentifier( ConnectionIdentifierType& rReturn
     static const char* pDisplay = getenv( "DISPLAY" );
     rReturnedType   = AsciiCString;
     rReturnedBytes  = pDisplay ? strlen( pDisplay )+1 : 1;
-    return pDisplay ? (void*)pDisplay : (void*)"";
+    return pDisplay ? const_cast<char *>(pDisplay) : const_cast<char *>("");
 }
 
 SalFrame *X11SalInstance::CreateFrame( SalFrame *pParent, sal_uLong nSalFrameStyle )
diff --git a/vcl/unx/generic/dtrans/X11_service.cxx b/vcl/unx/generic/dtrans/X11_service.cxx
index 360b29d087ad..3b8f45bb6991 100644
--- a/vcl/unx/generic/dtrans/X11_service.cxx
+++ b/vcl/unx/generic/dtrans/X11_service.cxx
@@ -85,12 +85,12 @@ css::uno::Reference< XInterface > X11SalInstance::CreateClipboard( const Sequenc
 
 css::uno::Reference< XInterface > X11SalInstance::CreateDragSource()
 {
-    return css::uno::Reference < XInterface >( ( OWeakObject * ) new SelectionManagerHolder() );
+    return css::uno::Reference < XInterface >( static_cast<OWeakObject *>(new SelectionManagerHolder()) );
 }
 
 css::uno::Reference< XInterface > X11SalInstance::CreateDropTarget()
 {
-    return css::uno::Reference < XInterface >( ( OWeakObject * ) new DropTarget() );
+    return css::uno::Reference < XInterface >( static_cast<OWeakObject *>(new DropTarget()) );
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/generic/window/salframe.cxx b/vcl/unx/generic/window/salframe.cxx
index 1591ffe520ef..d2511917ee85 100644
--- a/vcl/unx/generic/window/salframe.cxx
+++ b/vcl/unx/generic/window/salframe.cxx
@@ -3041,7 +3041,7 @@ void X11SalFrame::beginUnicodeSequence()
         aEv.mnCursorFlags   = 0;
         aEv.mbOnlyCursor    = false;
 
-        CallCallback(SALEVENT_EXTTEXTINPUT, (void*)&aEv);
+        CallCallback(SALEVENT_EXTTEXTINPUT, static_cast<void*>(&aEv));
     }
 }
 
@@ -3070,7 +3070,7 @@ bool X11SalFrame::appendUnicodeSequence( sal_Unicode c )
             aEv.mnCursorFlags   = 0;
             aEv.mbOnlyCursor    = false;
 
-            CallCallback(SALEVENT_EXTTEXTINPUT, (void*)&aEv);
+            CallCallback(SALEVENT_EXTTEXTINPUT, static_cast<void*>(&aEv));
             bRet = true;
         }
         else
@@ -3101,7 +3101,7 @@ bool X11SalFrame::endUnicodeSequence()
             aEv.mnCursorPos     = 0;
             aEv.mnCursorFlags   = 0;
             aEv.mbOnlyCursor    = false;
-            CallCallback(SALEVENT_EXTTEXTINPUT, (void*)&aEv);
+            CallCallback(SALEVENT_EXTTEXTINPUT, static_cast<void*>(&aEv));
         }
     }
     bool bWasInput = !rSeq.isEmpty();
diff --git a/vcl/unx/gtk/a11y/atkcomponent.cxx b/vcl/unx/gtk/a11y/atkcomponent.cxx
index f40cfe004733..08fd93afa6a7 100644
--- a/vcl/unx/gtk/a11y/atkcomponent.cxx
+++ b/vcl/unx/gtk/a11y/atkcomponent.cxx
@@ -321,14 +321,14 @@ component_wrapper_add_focus_handler (AtkComponent    *component,
     signal_id = g_signal_lookup( "focus-event", ATK_TYPE_OBJECT );
 
     ret = g_signal_handler_find( component, match_type, signal_id, 0, NULL,
-                                 (gpointer) &handler, NULL);
+                                 static_cast<gpointer>(&handler), NULL);
     if (!ret)
     {
         return g_signal_connect_closure_by_id (component,
                                                signal_id, 0,
                                                g_cclosure_new (
                                                G_CALLBACK (handler), NULL,
-                                               (GClosureNotify) NULL),
+                                               nullptr),
                                                FALSE);
     }
     else
diff --git a/vcl/unx/gtk/a11y/atkfactory.cxx b/vcl/unx/gtk/a11y/atkfactory.cxx
index fb0cc7741799..581f4d0091ac 100644
--- a/vcl/unx/gtk/a11y/atkfactory.cxx
+++ b/vcl/unx/gtk/a11y/atkfactory.cxx
@@ -58,14 +58,14 @@ atk_noop_object_wrapper_get_type()
         static const GTypeInfo typeInfo =
         {
             sizeof (AtkNoOpObjectClass),
-            (GBaseInitFunc) NULL,
-            (GBaseFinalizeFunc) NULL,
+            nullptr,
+            nullptr,
             reinterpret_cast<GClassInitFunc>(atk_noop_object_wrapper_class_init),
-            (GClassFinalizeFunc) NULL,
+            nullptr,
             NULL,
             sizeof (AtkObjectWrapper),
             0,
-            (GInstanceInitFunc) NULL,
+            nullptr,
             NULL
         } ;
 
diff --git a/vcl/unx/gtk/a11y/atkhypertext.cxx b/vcl/unx/gtk/a11y/atkhypertext.cxx
index e11f4987b6e5..47872486a55a 100644
--- a/vcl/unx/gtk/a11y/atkhypertext.cxx
+++ b/vcl/unx/gtk/a11y/atkhypertext.cxx
@@ -173,7 +173,7 @@ hyper_link_get_type()
 
         static const GInterfaceInfo atk_action_info = {
             reinterpret_cast<GInterfaceInitFunc>(actionIfaceInit),
-            (GInterfaceFinalizeFunc) NULL,
+            nullptr,
             NULL
         };
 
diff --git a/vcl/unx/gtk/a11y/atkregistry.cxx b/vcl/unx/gtk/a11y/atkregistry.cxx
index 10b76c3bffba..ee34ee1209c5 100644
--- a/vcl/unx/gtk/a11y/atkregistry.cxx
+++ b/vcl/unx/gtk/a11y/atkregistry.cxx
@@ -32,7 +32,7 @@ ooo_wrapper_registry_get(const Reference< XAccessible >& rxAccessible)
     if( uno_to_gobject )
     {
         gpointer cached =
-            g_hash_table_lookup(uno_to_gobject, (gpointer) rxAccessible.get());
+            g_hash_table_lookup(uno_to_gobject, static_cast<gpointer>(rxAccessible.get()));
 
         if( cached )
             return ATK_OBJECT( cached );
@@ -49,7 +49,7 @@ ooo_wrapper_registry_add(const Reference< XAccessible >& rxAccessible, AtkObject
    if( !uno_to_gobject )
         uno_to_gobject = g_hash_table_new (NULL, NULL);
 
-   g_hash_table_insert( uno_to_gobject, (gpointer) rxAccessible.get(), obj );
+   g_hash_table_insert( uno_to_gobject, static_cast<gpointer>(rxAccessible.get()), obj );
 }
 
 /*****************************************************************************/
@@ -58,7 +58,7 @@ void
 ooo_wrapper_registry_remove(XAccessible *pAccessible)
 {
     if( uno_to_gobject )
-        g_hash_table_remove( uno_to_gobject, (gpointer) pAccessible );
+        g_hash_table_remove( uno_to_gobject, static_cast<gpointer>(pAccessible) );
 }
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/unx/gtk/a11y/atktextattributes.cxx b/vcl/unx/gtk/a11y/atktextattributes.cxx
index 283ff59db9e8..484336773906 100644
--- a/vcl/unx/gtk/a11y/atktextattributes.cxx
+++ b/vcl/unx/gtk/a11y/atktextattributes.cxx
@@ -988,7 +988,7 @@ TabStopList2String( const uno::Any& rAny, bool default_tabs )
             if( ret )
             {
                 gchar * old_tab_str = ret;
-                ret = g_strconcat(old_tab_str, " ", tab_str, (const char*)NULL);
+                ret = g_strconcat(old_tab_str, " ", tab_str, nullptr);
                 g_free( old_tab_str );
             }
             else
diff --git a/vcl/unx/gtk/a11y/atkutil.cxx b/vcl/unx/gtk/a11y/atkutil.cxx
index 03f08e4f30c6..cc2fe84c39bd 100644
--- a/vcl/unx/gtk/a11y/atkutil.cxx
+++ b/vcl/unx/gtk/a11y/atkutil.cxx
@@ -742,14 +742,14 @@ ooo_atk_util_get_type()
         static const GTypeInfo typeInfo =
         {
             static_cast<guint16>(type_query.class_size),
-            (GBaseInitFunc) NULL,
-            (GBaseFinalizeFunc) NULL,
+            nullptr,
+            nullptr,
             reinterpret_cast<GClassInitFunc>(ooo_atk_util_class_init),
-            (GClassFinalizeFunc) NULL,
+            nullptr,
             NULL,
             static_cast<guint16>(type_query.instance_size),
             0,
-            (GInstanceInitFunc) NULL,
+            nullptr,
             NULL
         } ;
 
diff --git a/vcl/unx/gtk/a11y/atkwindow.cxx b/vcl/unx/gtk/a11y/atkwindow.cxx
index b845389c6437..635645f234e3 100644
--- a/vcl/unx/gtk/a11y/atkwindow.cxx
+++ b/vcl/unx/gtk/a11y/atkwindow.cxx
@@ -293,14 +293,14 @@ ooo_window_wrapper_get_type()
         static const GTypeInfo typeInfo =
         {
             static_cast<guint16>(type_query.class_size),
-            (GBaseInitFunc) NULL,
-            (GBaseFinalizeFunc) NULL,
+            nullptr,
+            nullptr,
             reinterpret_cast<GClassInitFunc>(ooo_window_wrapper_class_init),
-            (GClassFinalizeFunc) NULL,
+            nullptr,
             NULL,
             static_cast<guint16>(type_query.instance_size),
             0,
-            (GInstanceInitFunc) NULL,
+            nullptr,
             NULL
         } ;
 
diff --git a/vcl/unx/gtk/a11y/atkwrapper.cxx b/vcl/unx/gtk/a11y/atkwrapper.cxx
index 30cfa9c05074..ad27b6a3c6ff 100644
--- a/vcl/unx/gtk/a11y/atkwrapper.cxx
+++ b/vcl/unx/gtk/a11y/atkwrapper.cxx
@@ -665,10 +665,10 @@ atk_object_wrapper_get_type()
       static const GTypeInfo typeInfo =
       {
         sizeof (AtkObjectWrapperClass),
-        (GBaseInitFunc) NULL,
-        (GBaseFinalizeFunc) NULL,
+        nullptr,
+        nullptr,
         reinterpret_cast<GClassInitFunc>(atk_object_wrapper_class_init),
-        (GClassFinalizeFunc) NULL,
+        nullptr,
         NULL,
         sizeof (AtkObjectWrapper),
         0,
diff --git a/vcl/unx/gtk/app/gtkdata.cxx b/vcl/unx/gtk/app/gtkdata.cxx
index df1546ac9e43..df4470ba09ba 100644
--- a/vcl/unx/gtk/app/gtkdata.cxx
+++ b/vcl/unx/gtk/app/gtkdata.cxx
@@ -964,7 +964,7 @@ void GtkData::PostUserEvent()
         g_source_set_priority (m_pUserEvent, G_PRIORITY_HIGH);
         g_source_set_can_recurse (m_pUserEvent, TRUE);
         g_source_set_callback (m_pUserEvent, call_userEventFn,
-                               (gpointer) this, NULL);
+                               static_cast<gpointer>(this), NULL);
         g_source_attach (m_pUserEvent, g_main_context_default ());
     }
 }
diff --git a/vcl/unx/gtk/fpicker/SalGtkFilePicker.cxx b/vcl/unx/gtk/fpicker/SalGtkFilePicker.cxx
index 6c98ca6f72bf..d6e082fd4eb4 100644
--- a/vcl/unx/gtk/fpicker/SalGtkFilePicker.cxx
+++ b/vcl/unx/gtk/fpicker/SalGtkFilePicker.cxx
@@ -122,7 +122,7 @@ SalGtkFilePicker::SalGtkFilePicker( const uno::Reference< uno::XComponentContext
             GTK_FILE_CHOOSER_ACTION_OPEN,
             GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
             GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
-            (char *)NULL );
+            nullptr );
 
     gtk_dialog_set_default_response( GTK_DIALOG (m_pDialog), GTK_RESPONSE_ACCEPT );
 
@@ -240,7 +240,7 @@ SalGtkFilePicker::SalGtkFilePicker( const uno::Reference< uno::XComponentContext
         cell = gtk_cell_renderer_text_new ();
         gtk_tree_view_column_set_expand (column, true);
         gtk_tree_view_column_pack_start (column, cell, false);
-        gtk_tree_view_column_set_attributes (column, cell, "text", i, (char *)NULL);
+        gtk_tree_view_column_set_attributes (column, cell, "text", i, nullptr);
         gtk_tree_view_append_column (GTK_TREE_VIEW(m_pFilterView), column);
     }
 
@@ -272,7 +272,7 @@ SalGtkFilePicker::SalGtkFilePicker( const uno::Reference< uno::XComponentContext
     pango_layout_get_pixel_extents (layout, NULL, &row_height);
     g_object_unref (layout);
 
-    g_object_get (cell, "ypad", &ypad, (char *)NULL);
+    g_object_get (cell, "ypad", &ypad, nullptr);
     guint height = (row_height.height + 2*ypad) * 5;
     gtk_widget_set_size_request (m_pFilterView, -1, height);
     gtk_widget_set_size_request (m_pPreview, 1, height);
@@ -896,11 +896,11 @@ sal_Int16 SAL_CALL SalGtkFilePicker::execute() throw( uno::RuntimeException, std
 
     mnHID_FolderChange =
         g_signal_connect( GTK_FILE_CHOOSER( m_pDialog ), "current-folder-changed",
-            G_CALLBACK( folder_changed_cb ), ( gpointer )this );
+            G_CALLBACK( folder_changed_cb ), static_cast<gpointer>(this) );
 
     mnHID_SelectionChange =
         g_signal_connect( GTK_FILE_CHOOSER( m_pDialog ), "selection-changed",
-            G_CALLBACK( selection_changed_cb ), ( gpointer )this );
+            G_CALLBACK( selection_changed_cb ), static_cast<gpointer>(this) );
 
     int btn = GTK_RESPONSE_NO;
 
@@ -1352,7 +1352,7 @@ void SAL_CALL SalGtkFilePicker::setLabel( sal_Int16 nControlId, const OUString&
     }
     else if( tType == GTK_TYPE_TOGGLE_BUTTON || tType == GTK_TYPE_BUTTON || tType == GTK_TYPE_LABEL )
         g_object_set( pWidget, "label", aTxt.getStr(),
-                      "use_underline", true, (char *)NULL );
+                      "use_underline", true, nullptr );
     else
         OSL_TRACE("Can't set label on list");
 }
@@ -1535,7 +1535,7 @@ sal_Bool SAL_CALL SalGtkFilePicker::setShowState( sal_Bool bShowState ) throw( u
             {
                 mHID_Preview = g_signal_connect(
                     GTK_FILE_CHOOSER( m_pDialog ), "update-preview",
-                    G_CALLBACK( update_preview_cb ), ( gpointer )this );
+                    G_CALLBACK( update_preview_cb ), static_cast<gpointer>(this) );
             }
             gtk_widget_show( m_pPreview );
         }
@@ -1823,7 +1823,7 @@ GtkFileFilter* SalGtkFilePicker::implAddFilter( const OUString& rFilter, const O
                 gtk_file_filter_add_custom (filter, GTK_FILE_FILTER_URI,
                     case_insensitive_filter,
                     g_strdup( OUStringToOString(aToken, RTL_TEXTENCODING_UTF8).getStr() ),
-                    (GDestroyNotify) g_free );
+                    g_free );
 
                 OSL_TRACE( "fustering with %s", OUStringToOString( aToken, RTL_TEXTENCODING_UTF8 ).getStr());
             }
diff --git a/vcl/unx/gtk/fpicker/SalGtkFolderPicker.cxx b/vcl/unx/gtk/fpicker/SalGtkFolderPicker.cxx
index 0754101b3631..3a2fc6caf93f 100644
--- a/vcl/unx/gtk/fpicker/SalGtkFolderPicker.cxx
+++ b/vcl/unx/gtk/fpicker/SalGtkFolderPicker.cxx
@@ -54,7 +54,7 @@ SalGtkFolderPicker::SalGtkFolderPicker( const uno::Reference< uno::XComponentCon
     m_pDialog = gtk_file_chooser_dialog_new(
         OUStringToOString( getResString( FOLDERPICKER_TITLE ), RTL_TEXTENCODING_UTF8 ).getStr(),
         NULL, GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER, GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
-        GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, (char *)NULL );
+        GTK_STOCK_OK, GTK_RESPONSE_ACCEPT, nullptr );
 
     gtk_dialog_set_default_response( GTK_DIALOG (m_pDialog), GTK_RESPONSE_ACCEPT );
 #if ENABLE_GNOME_VFS || ENABLE_GIO
diff --git a/vcl/unx/gtk/gdi/salnativewidgets-gtk.cxx b/vcl/unx/gtk/gdi/salnativewidgets-gtk.cxx
index a34c143b99f9..463d9fe00ced 100644
--- a/vcl/unx/gtk/gdi/salnativewidgets-gtk.cxx
+++ b/vcl/unx/gtk/gdi/salnativewidgets-gtk.cxx
@@ -529,10 +529,10 @@ void GtkData::initNWF()
     gint vertical_padding = 1;
     gtk_widget_style_get( gWidgetData[0].gMenuWidget,
             "horizontal-padding", &horizontal_padding,
-            (char *)NULL);
+            nullptr);
     gtk_widget_style_get( gWidgetData[0].gMenuWidget,
             "vertical-padding", &vertical_padding,
-            (char *)NULL);
+            nullptr);
     gint xthickness = gWidgetData[0].gMenuWidget->style->xthickness;
     gint ythickness = gWidgetData[0].gMenuWidget->style->ythickness;
     pSVData->maNWFData.mnMenuFormatBorderX = xthickness + horizontal_padding;
@@ -774,7 +774,7 @@ bool GtkSalGraphics::hitTestNativeControl( ControlType        nType,
                               "has-secondary-forward-stepper", &has_forward2,
                               "has-backward-stepper", &has_backward,
                               "has-secondary-backward-stepper", &has_backward2,
-                              (char *)NULL );
+                              nullptr );
         Rectangle aForward;
         Rectangle aBackward;
 
@@ -1199,7 +1199,7 @@ bool GtkSalGraphics::getNativeControlRegion(  ControlType nType,
                 gWidgetData[m_nXScreen].gMenuItemCheckMenuWidget : gWidgetData[m_nXScreen].gMenuItemRadioMenuWidget;
             gtk_widget_style_get( pWidget,
                                   "indicator_size", &indicator_size,
-                                  (char *)NULL );
+                                  nullptr );
             rNativeBoundingRegion = rControlRegion;
             Rectangle aIndicatorRect( Point( 0,
                                              (rControlRegion.GetHeight()-indicator_size)/2),
@@ -1263,7 +1263,7 @@ bool GtkSalGraphics::getNativeControlRegion(  ControlType nType,
                               "indicator_spacing", &indicator_spacing,
                               "focus-line-width", &focusWidth,
                               "focus-padding", &focusPad,
-                              (char *)NULL);
+                              nullptr);
         indicator_size += 2*indicator_spacing + 2*(focusWidth + focusWidth);
         rNativeBoundingRegion = rControlRegion;
         Rectangle aIndicatorRect( Point( 0,
@@ -1295,7 +1295,7 @@ bool GtkSalGraphics::getNativeControlRegion(  ControlType nType,
         gtk_widget_style_get( widget,
                               "slider-width", &slider_width,
                               "slider-length", &slider_length,
-                              (char *)NULL);
+                              nullptr);
         Rectangle aRect( rControlRegion );
         if( nPart == PART_THUMB_HORZ )
         {
@@ -1642,10 +1642,10 @@ bool GtkSalGraphics::NWPaintGTKButtonReal(
     gtk_widget_style_get( gWidgetData[m_nXScreen].gBtnWidget,    "focus-line-width",    &focusWidth,
                                 "focus-padding",     &focusPad,
                                  "interior_focus",    &interiorFocus,
-                                (char *)NULL );
+                                nullptr );
     gtk_widget_style_get( gWidgetData[m_nXScreen].gBtnWidget,
                                 "default_border",    &pBorder,
-                                (char *)NULL );
+                                nullptr );
 
     // Make sure the border values exist, otherwise use some defaults
     if ( pBorder )
@@ -1748,7 +1748,7 @@ static Rectangle NWGetButtonArea( SalX11Screen nScreen,
                                 "focus-padding",     &focusPad,
                                  "interior_focus",    &interiorFocus,
                                 "default_border",    &pBorder,
-                                (char *)NULL );
+                                nullptr );
 
     // Make sure the border values exist, otherwise use some defaults
     if ( pBorder )
@@ -1821,7 +1821,7 @@ bool GtkSalGraphics::NWPaintGTKRadio( GdkDrawable* gdkDrawable,
     NWConvertVCLStateToGTKState( nState, &stateType, &shadowType );
 
     gint indicator_size;
-    gtk_widget_style_get( gWidgetData[m_nXScreen].gRadioWidget, "indicator_size", &indicator_size, (char *)NULL);
+    gtk_widget_style_get( gWidgetData[m_nXScreen].gRadioWidget, "indicator_size", &indicator_size, nullptr);
 
     x = rControlRectangle.Left() + (rControlRectangle.GetWidth()-indicator_size)/2;
     y = rControlRectangle.Top() + (rControlRectangle.GetHeight()-indicator_size)/2;
@@ -1878,7 +1878,7 @@ bool GtkSalGraphics::NWPaintGTKCheck( GdkDrawable* gdkDrawable,
     NWConvertVCLStateToGTKState( nState, &stateType, &shadowType );
 
     gint indicator_size;
-    gtk_widget_style_get( gWidgetData[m_nXScreen].gCheckWidget, "indicator_size", &indicator_size, (char *)NULL);
+    gtk_widget_style_get( gWidgetData[m_nXScreen].gCheckWidget, "indicator_size", &indicator_size, nullptr);
 
     x = rControlRectangle.Left() + (rControlRectangle.GetWidth()-indicator_size)/2;
     y = rControlRectangle.Top() + (rControlRectangle.GetHeight()-indicator_size)/2;
@@ -1976,7 +1976,7 @@ bool GtkSalGraphics::NWPaintGTKScrollbar( ControlType, ControlPart nPart,
                                       "stepper_size", &stepper_size,
                                       "trough_border", &trough_border,
                                       "stepper_spacing", &stepper_spacing,
-                                      "min_slider_length", &min_slider_length, (char *)NULL );
+                                      "min_slider_length", &min_slider_length, nullptr );
     gboolean has_forward;
     gboolean has_forward2;
     gboolean has_backward;
@@ -1985,7 +1985,7 @@ bool GtkSalGraphics::NWPaintGTKScrollbar( ControlType, ControlPart nPart,
     gtk_widget_style_get( gWidgetData[m_nXScreen].gScrollHorizWidget, "has-forward-stepper", &has_forward,
                                       "has-secondary-forward-stepper", &has_forward2,
                                       "has-backward-stepper", &has_backward,
-                                         "has-secondary-backward-stepper", &has_backward2, (char *)NULL );
+                                         "has-secondary-backward-stepper", &has_backward2, nullptr );
     gint magic = trough_border ? 1 : 0;
     gint nFirst = 0;
 
@@ -2253,7 +2253,7 @@ static Rectangle NWGetScrollButtonRect(    SalX11Screen nScreen, ControlPart nPa
                                       "slider-width", &slider_width,
                                       "stepper-size", &stepper_size,
                                       "trough-border", &trough_border,
-                                         "stepper-spacing", &stepper_spacing, (char *)NULL );
+                                         "stepper-spacing", &stepper_spacing, nullptr );
 
     gboolean has_forward;
     gboolean has_forward2;
@@ -2264,7 +2264,7 @@ static Rectangle NWGetScrollButtonRect(    SalX11Screen nScreen, ControlPart nPa
                                       "has-forward-stepper", &has_forward,
                                       "has-secondary-forward-stepper", &has_forward2,
                                       "has-backward-stepper", &has_backward,
-                                         "has-secondary-backward-stepper", &has_backward2, (char *)NULL );
+                                         "has-secondary-backward-stepper", &has_backward2, nullptr );
     gint       buttonWidth;
     gint       buttonHeight;
     Rectangle  buttonRect;
@@ -2369,7 +2369,7 @@ static Rectangle NWGetEditBoxPixmapRect(SalX11Screen nScreen,
     // Grab some entry style attributes
     gtk_widget_style_get( gWidgetData[nScreen].gEditBoxWidget,
                                     "focus-line-width",    &focusWidth,
-                                     "interior-focus",    &interiorFocus, (char *)NULL );
+                                     "interior-focus",    &interiorFocus, nullptr );
 
     if ( !interiorFocus )
     {
@@ -2435,7 +2435,7 @@ static void NWPaintOneEditBox(    SalX11Screen nScreen,
     gtk_widget_style_get( widget,
         "interior-focus",   &bInteriorFocus,
         "focus-line-width", &nFocusLineWidth,
-        (char *)NULL);
+        nullptr);
     if ( !bInteriorFocus )
     {
         xborder += nFocusLineWidth;
@@ -2527,7 +2527,7 @@ bool GtkSalGraphics::NWPaintGTKSpinBox( ControlType nType, ControlPart nPart,
         }
 
         NWSetWidgetState( gWidgetData[m_nXScreen].gSpinButtonWidget, nState, stateType );
-        gtk_widget_style_get( gWidgetData[m_nXScreen].gSpinButtonWidget, "shadow_type", &shadowType, (char *)NULL );
+        gtk_widget_style_get( gWidgetData[m_nXScreen].gSpinButtonWidget, "shadow_type", &shadowType, nullptr );
 
         if ( shadowType != GTK_SHADOW_NONE )
         {
@@ -2734,7 +2734,7 @@ static Rectangle NWGetComboBoxButtonRect( SalX11Screen nScreen,
     // Grab some button style attributes
     gtk_widget_style_get( gWidgetData[nScreen].gDropdownWidget,
                                       "focus-line-width",    &nFocusWidth,
-                                    "focus-padding",     &nFocusPad, (char *)NULL );
+                                    "focus-padding",     &nFocusPad, nullptr );
 
     nArrowWidth = MIN_ARROW_SIZE + (GTK_MISC(gWidgetData[nScreen].gArrowWidget)->xpad * 2);
     nButtonWidth = nArrowWidth +
@@ -2961,7 +2961,7 @@ bool GtkSalGraphics::NWPaintGTKListBox( GdkDrawable* gdkDrawable,
             "interior_focus",    &bInteriorFocus,
             "focus_line_width",    &nFocusLineWidth,
             "focus_padding",    &nFocusPadding,
-            (char *)NULL);
+            nullptr);
     }
 
     for( clipList::const_iterator it = rClipList.begin(); it != rClipList.end(); ++it )
@@ -3200,7 +3200,7 @@ bool GtkSalGraphics::NWPaintGTKMenubar(
         {
             gtk_widget_style_get( gWidgetData[m_nXScreen].gMenuItemMenubarWidget,
                                   "selected_shadow_type", &selected_shadow_type,
-                                  (char *)NULL);
+                                  nullptr);
         }
     }
 
@@ -3291,7 +3291,7 @@ bool GtkSalGraphics::NWPaintGTKPopupMenu(
     {
         gtk_widget_style_get( gWidgetData[m_nXScreen].gMenuItemMenuWidget,
                               "selected_shadow_type", &selected_shadow_type,
-                              (char *)NULL);
+                              nullptr);
     }
 
     NWSetWidgetState( gWidgetData[m_nXScreen].gMenuWidget, nState, stateType );
@@ -3685,7 +3685,7 @@ static Rectangle NWGetListBoxButtonRect( SalX11Screen nScreen,
 
     gtk_widget_style_get( gWidgetData[nScreen].gOptionMenuWidget,
             "indicator_size",    &pIndicatorSize,
-            "indicator_spacing",&pIndicatorSpacing, (char *)NULL);
+            "indicator_spacing",&pIndicatorSpacing, nullptr);
 
     if ( pIndicatorSize )
         width = pIndicatorSize->width;
@@ -3748,7 +3748,7 @@ static Rectangle NWGetListBoxIndicatorRect( SalX11Screen nScreen,
 
     gtk_widget_style_get( gWidgetData[nScreen].gOptionMenuWidget,
             "indicator_size",    &pIndicatorSize,
-            "indicator_spacing",&pIndicatorSpacing, (char *)NULL);
+            "indicator_spacing",&pIndicatorSpacing, nullptr);
 
     if ( pIndicatorSize )
     {
@@ -3868,7 +3868,7 @@ void GtkSalGraphics::refreshFontconfig( GtkSettings *pSettings )
 {
     guint latest_fontconfig_timestamp = 0;
     static guint our_fontconfig_timestamp = 0;
-    g_object_get( pSettings, "gtk-fontconfig-timestamp", &latest_fontconfig_timestamp, (char *)NULL );
+    g_object_get( pSettings, "gtk-fontconfig-timestamp", &latest_fontconfig_timestamp, nullptr );
     if (latest_fontconfig_timestamp != our_fontconfig_timestamp)
     {
         bool bFirstTime = our_fontconfig_timestamp == 0;
@@ -4147,11 +4147,11 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
     // get cursor blink time
     gboolean blink = false;
 
-    g_object_get( pSettings, "gtk-cursor-blink", &blink, (char *)NULL );
+    g_object_get( pSettings, "gtk-cursor-blink", &blink, nullptr );
     if( blink )
     {
         gint blink_time = static_cast<gint>(STYLE_CURSOR_NOBLINKTIME);
-        g_object_get( pSettings, "gtk-cursor-blink-time", &blink_time, (char *)NULL );
+        g_object_get( pSettings, "gtk-cursor-blink-time", &blink_time, nullptr );
         // set the blink_time if there is a setting and it is reasonable
         // else leave the default value
         if( blink_time > 100 && blink_time != gint(STYLE_CURSOR_NOBLINKTIME) )
@@ -4167,7 +4167,7 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
                   "gtk-double-click-distance", &iDoubleClickDistance,
                   "gtk-dnd-drag-threshold", &iDragThreshold,
                   "gtk-menu-popup-delay", &iMenuPopupDelay,
-                  (char *)NULL );
+                  nullptr );
     aMouseSettings.SetDoubleClickTime( iDoubleClickTime );
     aMouseSettings.SetDoubleClickWidth( iDoubleClickDistance );
     aMouseSettings.SetDoubleClickHeight( iDoubleClickDistance );
@@ -4179,13 +4179,13 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
     gboolean showmenuicons = true, primarybuttonwarps = false;
     g_object_get( pSettings,
         "gtk-menu-images", &showmenuicons,
-        (char *)NULL );
+        nullptr );
     if( g_object_class_find_property(
             G_OBJECT_GET_CLASS(pSettings), "gtk-primary-button-warps-slider") )
     {
         g_object_get( pSettings,
             "gtk-primary-button-warps-slider", &primarybuttonwarps,
-            (char *)NULL );
+            nullptr );
     }
     aStyleSet.SetPreferredUseImagesInMenus(showmenuicons);
     aStyleSet.SetPrimaryButtonWarpsSlider(primarybuttonwarps);
@@ -4200,14 +4200,14 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
                           "slider-width", &slider_width,
                           "trough-border", &trough_border,
                           "min-slider-length", &min_slider_length,
-                          (char *)NULL );
+                          nullptr );
     gint magic = trough_border ? 1 : 0;
     aStyleSet.SetScrollBarSize( slider_width + 2*trough_border );
     aStyleSet.SetMinThumbSize( min_slider_length - magic );
 
     // preferred icon style
     gchar* pIconThemeName = NULL;
-    g_object_get( pSettings, "gtk-icon-theme-name", &pIconThemeName, (char *)NULL );
+    g_object_get( pSettings, "gtk-icon-theme-name", &pIconThemeName, nullptr );
     aStyleSet.SetPreferredIconTheme( OUString::createFromAscii( pIconThemeName ) );
     g_free( pIconThemeName );
 
@@ -4322,7 +4322,7 @@ static void NWAddWidgetToCacheWindow( GtkWidget* widget, SalX11Screen nScreen )
         {
             rData.gCacheWindow = gtk_window_new( GTK_WINDOW_TOPLEVEL );
             g_object_set_data( G_OBJECT( rData.gCacheWindow ), "libo-version",
-                               (gpointer)LIBO_VERSION_DOTTED );
+                               const_cast<char *>(LIBO_VERSION_DOTTED) );
 
             GdkScreen* pScreen = gdk_display_get_screen( gdk_display_get_default(),
                                                          nScreen.getXScreen() );
@@ -4487,7 +4487,7 @@ static void NWEnsureGTKToolbar( SalX11Screen nScreen )
         gtk_widget_ensure_style( gWidgetData[nScreen].gToolbarWidget );
         gtk_widget_style_get( gWidgetData[nScreen].gToolbarWidget,
                               "button_relief", &aRelief,
-                              (char *)NULL);
+                              nullptr);
 
         gtk_button_set_relief( GTK_BUTTON(gWidgetData[nScreen].gToolbarButtonWidget), aRelief );
         GTK_WIDGET_UNSET_FLAGS( gWidgetData[nScreen].gToolbarButtonWidget, GTK_CAN_FOCUS );
diff --git a/vcl/unx/gtk/window/gtksalframe.cxx b/vcl/unx/gtk/window/gtksalframe.cxx
index 874f250b0b16..e590a8ab1bcd 100644
--- a/vcl/unx/gtk/window/gtksalframe.cxx
+++ b/vcl/unx/gtk/window/gtksalframe.cxx
@@ -956,14 +956,14 @@ ooo_fixed_get_type()
         static const GTypeInfo tinfo =
         {
             sizeof (GtkFixedClass),
-            (GBaseInitFunc) NULL,      /* base init */
-            (GBaseFinalizeFunc) NULL,  /* base finalize */
-            (GClassInitFunc) NULL,     /* class init */
-            (GClassFinalizeFunc) NULL, /* class finalize */
+            nullptr,      /* base init */
+            nullptr,  /* base finalize */
+            nullptr,     /* class init */
+            nullptr, /* class finalize */
             NULL,                      /* class data */
             sizeof (GtkFixed),         /* instance size */
             0,                         /* nb preallocs */
-            (GInstanceInitFunc) NULL,  /* instance init */
+            nullptr,  /* instance init */
             NULL                       /* value table */
         };
 
@@ -1296,7 +1296,7 @@ void GtkSalFrame::Init( SalFrame* pParent, sal_uLong nStyle )
         m_pWindow = gtk_widget_new( GTK_TYPE_WINDOW, "type", eWinType,
                                     "visible", FALSE, NULL );
     g_object_set_data( G_OBJECT( m_pWindow ), "SalFrame", this );
-    g_object_set_data( G_OBJECT( m_pWindow ), "libo-version", (gpointer)LIBO_VERSION_DOTTED);
+    g_object_set_data( G_OBJECT( m_pWindow ), "libo-version", const_cast<char *>(LIBO_VERSION_DOTTED));
 
     // force wm class hint
     m_nExtStyle = ~0;
@@ -4048,7 +4048,7 @@ void GtkSalFrame::IMHandler::doCallEndExtTextInput()
 void GtkSalFrame::IMHandler::updateIMSpotLocation()
 {
     SalExtTextInputPosEvent aPosEvent;
-    m_pFrame->CallCallback( SALEVENT_EXTTEXTINPUTPOS, (void*)&aPosEvent );
+    m_pFrame->CallCallback( SALEVENT_EXTTEXTINPUTPOS, static_cast<void*>(&aPosEvent) );
     GdkRectangle aArea;
     aArea.x = aPosEvent.mnX;
     aArea.y = aPosEvent.mnY;
@@ -4070,7 +4070,7 @@ void GtkSalFrame::IMHandler::sendEmptyCommit()
     aEmptyEv.mnCursorPos        = 0;
     aEmptyEv.mnCursorFlags      = 0;
     aEmptyEv.mbOnlyCursor       = False;
-    m_pFrame->CallCallback( SALEVENT_EXTTEXTINPUT, (void*)&aEmptyEv );
+    m_pFrame->CallCallback( SALEVENT_EXTTEXTINPUT, static_cast<void*>(&aEmptyEv) );
     if( ! aDel.isDeleted() )
         m_pFrame->CallCallback( SALEVENT_ENDEXTTEXTINPUT, NULL );
 }
@@ -4289,7 +4289,7 @@ void GtkSalFrame::IMHandler::signalIMCommit( GtkIMContext* pContext, gchar* pTex
         }
         if( ! bSingleCommit )
         {
-            pThis->m_pFrame->CallCallback( SALEVENT_EXTTEXTINPUT, (void*)&pThis->m_aInputEvent);
+            pThis->m_pFrame->CallCallback( SALEVENT_EXTTEXTINPUT, static_cast<void*>(&pThis->m_aInputEvent));
             if( ! aDel.isDeleted() )
                 pThis->doCallEndExtTextInput();
         }
@@ -4413,7 +4413,7 @@ void GtkSalFrame::IMHandler::signalIMPreeditChanged( GtkIMContext*, gpointer im_
     SolarMutexGuard aGuard;
     vcl::DeletionListener aDel( pThis->m_pFrame );
 
-    pThis->m_pFrame->CallCallback( SALEVENT_EXTTEXTINPUT, (void*)&pThis->m_aInputEvent);
+    pThis->m_pFrame->CallCallback( SALEVENT_EXTTEXTINPUT, static_cast<void*>(&pThis->m_aInputEvent));
     if( bEndPreedit && ! aDel.isDeleted() )
         pThis->doCallEndExtTextInput();
     if( ! aDel.isDeleted() )
diff --git a/vcl/unx/gtk/window/hudawareness.cxx b/vcl/unx/gtk/window/hudawareness.cxx
index 947f404f9d52..760103314d7c 100644
--- a/vcl/unx/gtk/window/hudawareness.cxx
+++ b/vcl/unx/gtk/window/hudawareness.cxx
@@ -61,7 +61,7 @@ hud_awareness_register (GDBusConnection       *connection,
   HudAwarenessHandle *handle;
   guint object_id;
 
-  memset ((void *)&vtable, 0, sizeof (vtable));
+  memset (static_cast<void *>(&vtable), 0, sizeof (vtable));
   vtable.method_call = hud_awareness_method_call;
 
   if G_UNLIKELY (iface == NULL)
diff --git a/vcl/unx/gtk3/gdi/gtk3salnativewidgets-gtk.cxx b/vcl/unx/gtk3/gdi/gtk3salnativewidgets-gtk.cxx
index 3b0662692d73..09bfac55a89e 100644
--- a/vcl/unx/gtk3/gdi/gtk3salnativewidgets-gtk.cxx
+++ b/vcl/unx/gtk3/gdi/gtk3salnativewidgets-gtk.cxx
@@ -167,7 +167,7 @@ Rectangle GtkSalGraphics::NWGetScrollButtonRect( ControlPart nPart, Rectangle aA
                                  "slider-width", &slider_width,
                                  "stepper-size", &stepper_size,
                                  "trough-border", &trough_border,
-                                 "stepper-spacing", &stepper_spacing, (char *)NULL );
+                                 "stepper-spacing", &stepper_spacing, nullptr );
 
     gboolean has_forward;
     gboolean has_forward2;
@@ -178,7 +178,7 @@ Rectangle GtkSalGraphics::NWGetScrollButtonRect( ControlPart nPart, Rectangle aA
                                  "has-forward-stepper", &has_forward,
                                  "has-secondary-forward-stepper", &has_forward2,
                                  "has-backward-stepper", &has_backward,
-                                 "has-secondary-backward-stepper", &has_backward2, (char *)NULL );
+                                 "has-secondary-backward-stepper", &has_backward2, nullptr );
     gint       buttonWidth;
     gint       buttonHeight;
     Rectangle  buttonRect;
@@ -285,7 +285,7 @@ void GtkSalGraphics::PaintScrollbar(GtkStyleContext *context,
                                  "stepper_size", &stepper_size,
                                  "trough_border", &trough_border,
                                  "stepper_spacing", &stepper_spacing,
-                                 "min_slider_length", &min_slider_length, (char *)NULL );
+                                 "min_slider_length", &min_slider_length, nullptr );
     gboolean has_forward;
     gboolean has_forward2;
     gboolean has_backward;
@@ -295,7 +295,7 @@ void GtkSalGraphics::PaintScrollbar(GtkStyleContext *context,
                                  "has-forward-stepper", &has_forward,
                                  "has-secondary-forward-stepper", &has_forward2,
                                  "has-backward-stepper", &has_backward,
-                                 "has-secondary-backward-stepper", &has_backward2, (char *)NULL );
+                                 "has-secondary-backward-stepper", &has_backward2, nullptr );
     gint magic = trough_border ? 1 : 0;
     gint nFirst = 0;
     gint slider_side = slider_width + (trough_border * 2);
@@ -1229,7 +1229,7 @@ bool GtkSalGraphics::getNativeControlRegion( ControlType nType, ControlPart nPar
         gtk_style_context_get_style( mpCheckButtonStyle,
                                      "indicator-size", &indicator_size,
                                      "indicator-spacing", &indicator_spacing,
-                                     (char *)NULL );
+                                     nullptr );
 
         GtkBorder border;
         gtk_style_context_get_border(mpCheckButtonStyle, GTK_STATE_FLAG_NORMAL, &border);
@@ -1255,7 +1255,7 @@ bool GtkSalGraphics::getNativeControlRegion( ControlType nType, ControlPart nPar
 
             gtk_style_context_get_style( mpMenuItemStyle,
                                          "indicator-size", &indicator_size,
-                                         (char *)NULL );
+                                         nullptr );
 
             point = MAX(0, rControlRegion.GetHeight() - indicator_size);
             aEditRect = Rectangle( Point( 0, point / 2),
@@ -1697,11 +1697,11 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
     // get cursor blink time
     gboolean blink = false;
 
-    g_object_get( pSettings, "gtk-cursor-blink", &blink, (char *)NULL );
+    g_object_get( pSettings, "gtk-cursor-blink", &blink, nullptr );
     if( blink )
     {
         gint blink_time = static_cast<gint>(STYLE_CURSOR_NOBLINKTIME);
-        g_object_get( pSettings, "gtk-cursor-blink-time", &blink_time, (char *)NULL );
+        g_object_get( pSettings, "gtk-cursor-blink-time", &blink_time, nullptr );
         // set the blink_time if there is a setting and it is reasonable
         // else leave the default value
         if( blink_time > 100 && blink_time != gint(STYLE_CURSOR_NOBLINKTIME) )
@@ -1717,7 +1717,7 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
                   "gtk-double-click-distance", &iDoubleClickDistance,
                   "gtk-dnd-drag-threshold", &iDragThreshold,
                   "gtk-menu-popup-delay", &iMenuPopupDelay,
-                  (char *)NULL );
+                  nullptr );
     aMouseSettings.SetDoubleClickTime( iDoubleClickTime );
     aMouseSettings.SetDoubleClickWidth( iDoubleClickDistance );
     aMouseSettings.SetDoubleClickHeight( iDoubleClickDistance );
@@ -1730,7 +1730,7 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
     g_object_get( pSettings,
         "gtk-menu-images", &showmenuicons,
         "gtk-primary-button-warps-slider", &primarybuttonwarps,
-        (char *)NULL );
+        nullptr );
     aStyleSet.SetPreferredUseImagesInMenus(showmenuicons);
     aStyleSet.SetPrimaryButtonWarpsSlider(primarybuttonwarps);
 
@@ -1744,14 +1744,14 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
                                  "slider-width", &slider_width,
                                  "trough-border", &trough_border,
                                  "min-slider-length", &min_slider_length,
-                                 (char *)NULL );
+                                 nullptr );
     gint magic = trough_border ? 1 : 0;
     aStyleSet.SetScrollBarSize( slider_width + 2*trough_border );
     aStyleSet.SetMinThumbSize( min_slider_length - magic );
 
     // preferred icon style
     gchar* pIconThemeName = NULL;
-    g_object_get( pSettings, "gtk-icon-theme-name", &pIconThemeName, (char *)NULL );
+    g_object_get( pSettings, "gtk-icon-theme-name", &pIconThemeName, nullptr );
     aStyleSet.SetPreferredIconTheme( OUString::createFromAscii( pIconThemeName ) );
     g_free( pIconThemeName );
 
@@ -1762,7 +1762,7 @@ void GtkSalGraphics::updateSettings( AllSettings& rSettings )
     // finally update the collected settings
     rSettings.SetStyleSettings( aStyleSet );
     gchar* pThemeName = NULL;
-    g_object_get( pSettings, "gtk-theme-name", &pThemeName, (char *)NULL );
+    g_object_get( pSettings, "gtk-theme-name", &pThemeName, nullptr );
     #if OSL_DEBUG_LEVEL > 1
     fprintf( stderr, "Theme name is \"%s\"\n", pThemeName );
     #endif
diff --git a/vcl/unx/kde4/KDESalFrame.cxx b/vcl/unx/kde4/KDESalFrame.cxx
index 540773dde5f0..6c464ac810a5 100644
--- a/vcl/unx/kde4/KDESalFrame.cxx
+++ b/vcl/unx/kde4/KDESalFrame.cxx
@@ -72,7 +72,7 @@ static Color toColor( const QColor &rColor )
 */
 static OUString readEntryUntranslated( KConfigGroup *pGroup, const char *pKey )
 {
-    return OUString::createFromAscii( (const char *) pGroup->readEntryUntranslated( pKey ).toAscii() );
+    return OUString::createFromAscii( static_cast<const char *>(pGroup->readEntryUntranslated( pKey ).toAscii()) );
 }
 
 /** Helper function to add information to Font from QFont.
@@ -85,7 +85,7 @@ static vcl::Font toFont( const QFont &rQFont, const ::com::sun::star::lang::Loca
     QFontInfo qFontInfo( rQFont );
 
     // set family name
-    aInfo.m_aFamilyName = OUString( (const char *) rQFont.family().toUtf8(), strlen( (const char *) rQFont.family().toUtf8() ), RTL_TEXTENCODING_UTF8 );
+    aInfo.m_aFamilyName = OUString( static_cast<const char *>(rQFont.family().toUtf8()), strlen( static_cast<const char *>(rQFont.family().toUtf8()) ), RTL_TEXTENCODING_UTF8 );
 
     // set italic
     aInfo.m_eItalic = ( qFontInfo.italic()? ITALIC_NORMAL: ITALIC_NONE );