Fix segmentation fault when calling with --errorlist and add a testcase for it.

lib/checkother.cpp

@@ -2629,7 +2629,10 @@ void CheckOther::zerodivError(const Token *tok)
 
 void CheckOther::mathfunctionCallError(const Token *tok)
 {
+    if (tok)
         reportError(tok, Severity::error, "wrongmathcall", "Passing value " + tok->tokAt(2)->str() + " to " + tok->str() + "() leads to undefined result");
+    else
+        reportError(tok, Severity::error, "wrongmathcall", "Passing value " " to " "() leads to undefined result");
 }
 
 void CheckOther::postIncrementError(const Token *tok, const std::string &var_name, const bool isIncrement)

lib/cppcheck.cpp

@@ -320,19 +320,7 @@ void CppCheck::parseFromArgs(int argc, const char* const argv[])
         // print all possible error messages..
         else if (strcmp(argv[i], "--errorlist") == 0)
         {
-            // call all "getErrorMessages" in all registered Check classes
+            getErrorMessages();
-            std::cout << ErrorLogger::ErrorMessage::getXMLHeader();
-            for (std::list<Check *>::iterator it = Check::instances().begin(); it != Check::instances().end(); ++it)
-            {
-                (*it)->getErrorMessages();
-            }
-
-            Tokenizer tokenizer(&_settings, 0);
-            tokenizer.getErrorMessages();
-
-            std::cout << ErrorLogger::ErrorMessage::getXMLFooter() << std::endl;
-
-            return;
         }
 
         // documentation..
@@ -674,3 +662,18 @@ void CppCheck::reportStatus(unsigned int /*index*/, unsigned int /*max*/)
 {
 
 }
+
+void CppCheck::getErrorMessages()
+{
+    // call all "getErrorMessages" in all registered Check classes
+    std::cout << ErrorLogger::ErrorMessage::getXMLHeader();
+    for (std::list<Check *>::iterator it = Check::instances().begin(); it != Check::instances().end(); ++it)
+    {
+        (*it)->getErrorMessages();
+    }
+
+    Tokenizer tokenizer(&_settings, 0);
+    tokenizer.getErrorMessages();
+
+    std::cout << ErrorLogger::ErrorMessage::getXMLFooter() << std::endl;
+}

lib/cppcheck.h

@@ -124,6 +124,12 @@ public:
         _settings.terminate();
     }
 
+    /**
+     * @brief Call all "getErrorMessages" in all registered Check classes.
+     * Also print out xml header and footer.
+     */
+    void getErrorMessages();
+
 private:
     void checkFile(const std::string &code, const char FileName[]);
 

test/testcppcheck.cpp

@@ -54,6 +54,7 @@ private:
 
         TEST_CASE(include);
         TEST_CASE(templateFormat);
+        TEST_CASE(getErrorMessages);
     }
 
     void linenumbers()
@@ -120,6 +121,13 @@ private:
         ASSERT_EQUALS("[some/{file}file.cpp:10]: (testSeverity) long testMessage", errmsg.toText());
         ASSERT_EQUALS("testId-some/{file}file.cpp,testSeverity.10?{long testMessage}", errmsg.toText("{id}-{file},{severity}.{line}?{{message}}"));
     }
+
+    void getErrorMessages()
+    {
+        errout.str("");
+        CppCheck cppCheck(*this);
+        cppCheck.getErrorMessages();
+    }
 };
 
 REGISTER_TEST(TestCppcheck)