comctl32/listbox: Use a helper to retrieve item string by index.

dlls/comctl32/listbox.c

@@ -158,6 +158,11 @@ static ULONG_PTR get_item_data( const LB_DESCR *descr, UINT index )
     return (descr->style & LBS_NODATA) ? 0 : descr->items[index].data;
 }
 
+static WCHAR *get_item_string( const LB_DESCR *descr, UINT index )
+{
+    return HAS_STRINGS(descr) ? descr->items[index].str : NULL;
+}
+
 static BOOL is_item_selected( const LB_DESCR *descr, UINT index )
 {
     if (!(descr->style & (LBS_MULTIPLESEL | LBS_EXTENDEDSEL)))
@@ -526,11 +531,11 @@ static void LISTBOX_PaintItem( LB_DESCR *descr, HDC hdc, const RECT *rect,
 			       INT index, UINT action, BOOL ignoreFocus )
 {
     BOOL selected = FALSE, focused;
-    LB_ITEMDATA *item = NULL;
+    WCHAR *item_str = NULL;
 
     if (index < descr->nb_items)
     {
-        item = &descr->items[index];
+        item_str = get_item_string(descr, index);
         selected = is_item_selected(descr, index);
     }
 
@@ -573,7 +578,7 @@ static void LISTBOX_PaintItem( LB_DESCR *descr, HDC hdc, const RECT *rect,
         dis.itemData     = get_item_data(descr, index);
         dis.rcItem       = *rect;
         TRACE("[%p]: drawitem %d (%s) action=%02x state=%02x rect=%s\n",
-              descr->self, index, item ? debugstr_w(item->str) : "", action,
+              descr->self, index, debugstr_w(item_str), action,
               dis.itemState, wine_dbgstr_rect(rect) );
         SendMessageW(descr->owner, WM_DRAWITEM, dis.CtlID, (LPARAM)&dis);
         SelectClipRgn( hdc, hrgn );
@@ -595,22 +600,22 @@ static void LISTBOX_PaintItem( LB_DESCR *descr, HDC hdc, const RECT *rect,
         }
 
         TRACE("[%p]: painting %d (%s) action=%02x rect=%s\n",
-              descr->self, index, item ? debugstr_w(item->str) : "", action,
+              descr->self, index, debugstr_w(item_str), action,
               wine_dbgstr_rect(rect) );
-        if (!item)
+        if (!item_str)
             ExtTextOutW( hdc, rect->left + 1, rect->top,
                            ETO_OPAQUE | ETO_CLIPPED, rect, NULL, 0, NULL );
         else if (!(descr->style & LBS_USETABSTOPS))
             ExtTextOutW( hdc, rect->left + 1, rect->top,
-                         ETO_OPAQUE | ETO_CLIPPED, rect, item->str,
-                         strlenW(item->str), NULL );
+                         ETO_OPAQUE | ETO_CLIPPED, rect, item_str,
+                         strlenW(item_str), NULL );
         else
 	{
 	    /* Output empty string to paint background in the full width. */
             ExtTextOutW( hdc, rect->left + 1, rect->top,
                          ETO_OPAQUE | ETO_CLIPPED, rect, NULL, 0, NULL );
             TabbedTextOutW( hdc, rect->left + 1 , rect->top,
-                            item->str, strlenW(item->str),
+                            item_str, strlenW(item_str),
                             descr->nb_tabs, descr->tabs, 0);
 	}
         if (selected)
@@ -773,14 +778,16 @@ static LRESULT LISTBOX_GetText( LB_DESCR *descr, INT index, LPWSTR buffer, BOOL
 
     if (HAS_STRINGS(descr))
     {
+        WCHAR *str = get_item_string(descr, index);
+
         if (!buffer)
-            return strlenW(descr->items[index].str);
+            return strlenW(str);
 
-        TRACE("index %d (0x%04x) %s\n", index, index, debugstr_w(descr->items[index].str));
+        TRACE("index %d (0x%04x) %s\n", index, index, debugstr_w(str));
 
         __TRY  /* hide a Delphi bug that passes a read-only buffer */
         {
-            strcpyW( buffer, descr->items[index].str );
+            strcpyW(buffer, str);
             len = strlenW(buffer);
         }
         __EXCEPT_PAGE_FAULT
@@ -829,7 +836,7 @@ static INT LISTBOX_FindStringPos( LB_DESCR *descr, LPCWSTR str, BOOL exact )
     {
         index = (min + max) / 2;
         if (HAS_STRINGS(descr))
-            res = LISTBOX_lstrcmpiW( descr->locale, descr->items[index].str, str );
+            res = LISTBOX_lstrcmpiW( descr->locale, get_item_string(descr, index), str );
         else
         {
             COMPAREITEMSTRUCT cis;
@@ -872,7 +879,7 @@ static INT LISTBOX_FindFileStrPos( LB_DESCR *descr, LPCWSTR str )
     while (min != max)
     {
         INT index = (min + max) / 2;
-        LPCWSTR p = descr->items[index].str;
+        LPCWSTR p = get_item_string(descr, index);
         if (*p == '[')  /* drive or directory */
         {
             if (*str != '[') res = -1;
@@ -1646,7 +1653,7 @@ static void LISTBOX_DeleteItem( LB_DESCR *descr, INT index )
 {
     /* save the item data before it gets freed by LB_RESETCONTENT */
     ULONG_PTR item_data = get_item_data(descr, index);
-    LPWSTR item_str = descr->items[index].str;
+    LPWSTR item_str = get_item_string(descr, index);
 
     if (!descr->nb_items)
         SendMessageW( descr->self, LB_RESETCONTENT, 0, 0 );
@@ -1668,7 +1675,6 @@ static void LISTBOX_DeleteItem( LB_DESCR *descr, INT index )
         dis.itemData = item_data;
         SendMessageW( descr->owner, WM_DELETEITEM, id, (LPARAM)&dis );
     }
-    if (HAS_STRINGS(descr))
     HeapFree( GetProcessHeap(), 0, item_str );
 }
 
@@ -2672,7 +2678,7 @@ static LRESULT CALLBACK LISTBOX_WindowProc( HWND hwnd, UINT msg, WPARAM wParam,
             return LB_ERR;
         }
         if (!HAS_STRINGS(descr)) return sizeof(ULONG_PTR);
-        return strlenW( descr->items[wParam].str );
+        return strlenW(get_item_string(descr, wParam));
 
     case LB_GETCURSEL:
         if (descr->nb_items == 0)