TDEFileReplace: fixed unresponsive GUI and application crash when circular references are found on the file system.

Added a message to advice the user of the possible circular reference. This relates to bug 2264.

Manually cherry-picked from commit d7398464 (tdeutils).

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

tdefilereplace/tdefilereplacepart.cpp

@@ -52,6 +52,9 @@
 #include "commandengine.h"
 #include "whatthis.h"
 
+// Change this as well if increasing the max value allowed for the m_spbMaxDepth spinbox
+static const int CIRCULAR_LINK_DETECTION_LEVEL = 256;
+
 using namespace whatthisNameSpace;
 
 //PUBLIC CONSTRUCTORS
@@ -71,6 +74,7 @@ TDEFileReplacePart::TDEFileReplacePart(TQWidget* parentWidget, const char* , TQO
   m_optionMask = TQDir::Files;
   m_w = widget();
   m_option = 0;
+  m_circ_ref_warning_shown = false;
 
   loadOptionsFromRC();
   initView();
@@ -130,7 +134,10 @@ void TDEFileReplacePart::slotSearchingOperation()
   uint filesNumber = 0;
 
   if(m_option->m_recursive)
-    recursiveFileSearch(currentDirectory, currentFilter, filesNumber);
+    {
+    m_circ_ref_warning_shown = false;
+    recursiveFileSearch(currentDirectory, currentFilter, filesNumber, 0);
+    }
   else
     fileSearch(currentDirectory, currentFilter);
 
@@ -196,7 +203,8 @@ void TDEFileReplacePart::slotReplacingOperation()
   if(m_option->m_recursive)
     {
       int filesNumber = 0;
-      recursiveFileReplace(currentDirectory, filesNumber);
+      m_circ_ref_warning_shown = false;
+      recursiveFileReplace(currentDirectory, filesNumber, 0);
     }
   else
     {
@@ -962,11 +970,24 @@ void TDEFileReplacePart::fileReplace()
     }
 }
 
-void TDEFileReplacePart::recursiveFileReplace(const TQString& directoryName, int& filesNumber)
+void TDEFileReplacePart::recursiveFileReplace(const TQString& directoryName, int& filesNumber, int depth)
 {
   //if m_stop == true then interrupts recursion
   if(m_stop)
     return;
+  else if (!depth > CIRCULAR_LINK_DETECTION_LEVEL)
+    {
+      if (!m_circ_ref_warning_shown)
+        {
+          KMessageBox::information(m_w,
+              i18n("It seems you have a circular reference in your file system."
+                  "The search has been limited to this sublevel to prevent"
+                  "TDEFileReplace from crashing."),
+              i18n("Circular reference detected"));
+          m_circ_ref_warning_shown = true;
+        }
+      return;
+    }  
   else
     {
       TQDir d(directoryName);
@@ -995,13 +1016,13 @@ void TDEFileReplacePart::recursiveFileReplace(const TQString& directoryName, int
           TQFileInfo qi(filePath);
 
           m_view->displayScannedFiles(filesNumber);
+          kapp->processEvents();
 
           //if filePath is a directory then recursion
           if(qi.isDir())
-            recursiveFileReplace(filePath, filesNumber);
+            recursiveFileReplace(filePath, filesNumber, depth+1);
           else
             {
-	      kapp->processEvents();
               if(m_option->m_backup)
                 replaceAndBackup(d.canonicalPath(), fileName);
               else
@@ -1285,6 +1306,19 @@ void TDEFileReplacePart::recursiveFileSearch(const TQString& directoryName, cons
   // if m_stop == true then interrupt recursion
   if(m_stop)
     return;
+  else if (depth > CIRCULAR_LINK_DETECTION_LEVEL)
+    {
+      if (!m_circ_ref_warning_shown)
+        {
+          KMessageBox::information(m_w,
+              i18n("It seems you have a circular reference in your file system. "
+                  "The search has been limited to this sublevel to prevent "
+                  "TDEFileReplace from crashing."),
+              i18n("Circular reference detected"));
+          m_circ_ref_warning_shown = true;
+        }
+      return;
+    }  
   else
     {
       TQDir d(directoryName);
@@ -1312,12 +1346,12 @@ void TDEFileReplacePart::recursiveFileSearch(const TQString& directoryName, cons
 
           m_view->displayScannedFiles(filesNumber);
 
+          kapp->processEvents();
           // Searchs recursively if "filePath" is a directory
           if(fileInfo.isDir())
-            recursiveFileSearch(filePath+"/"+fileName, filters, filesNumber);
+            recursiveFileSearch(filePath+"/"+fileName, filters, filesNumber, depth+1);
           else
             {
-              kapp->processEvents();
               search(filePath, fileName);
               filesNumber++;
               m_view->displayScannedFiles(filesNumber);

tdefilereplace/tdefilereplacepart.h

@@ -42,8 +42,9 @@ class TDEFileReplacePart: public KParts::ReadOnlyPart
     TDEAboutApplication* m_aboutDlg;
     KeyValueMap m_replacementMap;
     RCOptions* m_option;
-    bool m_stop,
-         m_searchingOperation;
+    bool m_stop;
+    bool m_searchingOperation;
+    bool m_circ_ref_warning_shown;
     int m_optionMask;
 
   public://Constructors
@@ -133,7 +134,7 @@ class TDEFileReplacePart: public KParts::ReadOnlyPart
      * Replacing methods
      */
     void fileReplace();
-    void recursiveFileReplace(const TQString& dirName, int& filesNumber);
+    void recursiveFileReplace(const TQString& dirName, int& filesNumber, int depth);
     void replaceAndBackup(const TQString& currentDir, const TQString& oldFileName);
     void replaceAndOverwrite(const TQString& currentDir, const TQString& oldFileName);
     void replacingLoop(TQString& line, TDEListViewItem** item, bool& atLeastOneStringFound, int& occur, bool regularExpression, bool& askConfirmReplace);
@@ -142,7 +143,7 @@ class TDEFileReplacePart: public KParts::ReadOnlyPart
      * Searching methods
      */
     void fileSearch(const TQString& dirName, const TQString& filters);
-    void recursiveFileSearch(const TQString& dirName, const TQString& filters, uint& filesNumber);
+    void recursiveFileSearch(const TQString& dirName, const TQString& filters, uint& filesNumber, int depth);
     void search(const TQString& currentDir, const TQString& fileName);
 
     /**