libdatrwxx [WP]: make report_violation fit for multiline messages

src/libs/libdatrwxx/report.cc

@@ -56,34 +56,37 @@ namespace datrw {
                           const std::string& condition)
     {
 
-    cerr << "ERROR message from " << datrw::libversion << ":" << endl;
-    cerr << "  A problem occured while "
-              "reading or writing time series data!" << endl;
-    if (message.empty())
-    {
-      cerr << "  No message" << endl;
-    }
-    else
-    {
-      cerr << "  " << message << endl;
-    }
-    if (!condition.empty())
-    {
-      cerr << "  Violation of condition" << endl
-        << "    \"" << condition << "\"" << endl;
-    }
-    if (!file.empty())
-    {
-      cerr << "  triggered in \"" << file << "\" at line #" << line << endl;
-    }
-      cerr << endl;
-      cerr << "ERROR: " << datrw::libversion << " ";
-      cerr << "reports violation of condition:" << endl;
-      cerr << "    \"" << condition << "\"" << endl; 
-      cerr << "  while reading or writing time series data" << endl;
-      cerr << "  in " << file  << " at line " << line << endl; 
-      cerr << "  " << message << endl;
-    }
+      cerr << "ERROR message from " << datrw::libversion << ":" << endl;
+      cerr << "  A problem occured while "
+        "reading or writing time series data!" << endl;
+      if (!condition.empty())
+      {
+        cerr << "  Violation of condition" << endl
+          << "    \"" << condition << "\"" << endl;
+      }
+      if (!file.empty())
+      {
+        cerr << "  triggered in \"" << file << "\" at line #" << line << endl;
+      }
+      if (message.empty())
+      {
+        cerr << "  No message" << endl;
+      }
+      else
+      {
+        const std::string delimiter("\n");
+        std::string::size_type posend=0, pos=0;
+        std::string::size_type len=0;
+        while (posend!=std::string::npos) 
+        {
+          posend=message.find(delimiter, pos);
+          len=posend-pos;
+          cerr << "| " << message.substr(pos, len) << endl;
+          if (posend!=std::string::npos) { len+=delimiter.length(); }
+          pos+=len;
+        } // while (posend!=std::string::npos)
+      } // if (message.empty())
+    } // void report_violation(...)
 
     /*----------------------------------------------------------------------*/