* Define a function for the XML-reading workaround in order to clean up a bit.

For the moment we keep to copies of it -- one for the use within the various
  musrfit programs, one that can be used in user functions.

* musrt0 is now again activated in musrgui/musredit by default.

src/classes/PUserFcnBase.cpp

@@ -30,6 +30,7 @@
  ***************************************************************************/
 
 #include <vector>
+#include <fstream>
 using namespace std;
 
 #include "PUserFcnBase.h"
@@ -56,5 +57,47 @@ PUserFcnBase::~PUserFcnBase()
 {
 }
 
+//--------------------------------------------------------------------------
+// This function is a replacement for the ParseFile method of TSAXParser.
+// It is needed because in certain environments ParseFile does not work but ParseBuffer does.
+//--------------------------------------------------------------------------
+/**
+ * <p> Replacement for the ParseFile method of TSAXParser
+ *     that can be used in user functions.
+ *
+ * <p><b>return:</b>
+ * - 1 if file cannot be read
+ * - 0 if the file has been parsed successfully
+ * - parse error code otherwise
+ *
+ * \param saxParser pointer to a TSAXParser object
+ * \param startup_path_name full path to the XML file to be read
+ */
+Int_t parseXmlFile(TSAXParser *saxParser, const char *startup_path_name)
+{
+  Int_t status;
+  fstream xmlFile;
+  UInt_t xmlSize = 0;
+  Char_t *xmlBuffer = 0;
+
+  xmlFile.open(startup_path_name, ios::in | ios::ate); // open file for reading and go to the end of the file
+  if (xmlFile.is_open()) { // check if file has been opened successfully
+    xmlSize = xmlFile.tellg(); // get the position within the stream == size of the file (since we are at the end)
+    xmlFile.seekg(0, ios::beg); // go back to the beginning of the stream
+    xmlBuffer = new Char_t[xmlSize]; // allocate buffer memory for the whole XML file
+    xmlFile.read(xmlBuffer, xmlSize); // read in the whole XML file into the buffer
+    xmlFile.close(); // close the XML file
+  }
+  if (!xmlBuffer) { // file has not been read into the buffer
+    status = 1;
+  } else {
+    status = saxParser->ParseBuffer(xmlBuffer, xmlSize); // parse buffer
+    delete[] xmlBuffer; // free the buffer memory
+    xmlBuffer = 0;
+  }
+
+  return status;
+}
+
 // place a void pointer vector for global user function objects which might be needed
 vector<void *> gGlobalUserFcn;