Fix ticket #598 (Preprocessor: Multiline comments add line change to wrong location)

http://sourceforge.net/apps/trac/cppcheck/ticket/598

src/preprocessor.cpp

@@ -368,8 +368,7 @@ std::string Preprocessor::removeComments(const std::string &str)
                 ch = str[i];
                 if (ch == '\n')
                 {
-                    code << "\n";
+                    ++newlines;
-                    previous = '\n';
                     ++lineno;
                 }
             }

test/testpreprocessor.cpp

@@ -98,6 +98,7 @@ private:
         TEST_CASE(multiline2);
         TEST_CASE(multiline3);
         TEST_CASE(multiline4);
+        TEST_CASE(multiline5);
 
         TEST_CASE(if_defined);      // "#if defined(AAA)" => "#ifdef AAA"
         TEST_CASE(if_not_defined);  // "#if !defined(AAA)" => "#ifndef AAA"
@@ -718,6 +719,27 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void multiline5()
+    {
+        errout.str("");
+        const char filedata[] = "#define ABC int a /*\n"
+                                "*/= 4;\n"
+                                "int main(){\n"
+                                "ABC\n"
+                                "}\n";
+
+        // Preprocess => actual result..
+        std::istringstream istr(filedata);
+        std::map<std::string, std::string> actual;
+        Preprocessor preprocessor;
+        preprocessor.preprocess(istr, actual, "file.c");
+
+        // Compare results..
+        ASSERT_EQUALS(1, static_cast<unsigned int>(actual.size()));
+        ASSERT_EQUALS("\n\nint main(){\nint a = 4;\n}\n", actual[""]);
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void if_defined()
     {
         const char filedata[] = "#if defined(AAA)\n"