Fix ticket #181 (#pragma causes wrong line numbers)

http://apps.sourceforge.net/trac/cppcheck/ticket/181

src/preprocessor.cpp

@@ -449,17 +449,20 @@ std::string Preprocessor::getcode(const std::string &filedata, std::string cfg)
         }
 
         if (line.find("#file \"") == 0 ||
-            line.find("#endfile") == 0)
+            line.find("#endfile") == 0 ||
+            line.find("#define") == 0)
         {
             // We must not remove #file tags or line numbers
             // are corrupted. File tags are removed by the tokenizer.
         }
         else if (!match ||
-                 line.find("#if") == 0 ||
-                 line.find("#else") == 0 ||
-                 line.find("#elif") == 0 ||
-                 line.find("#endif") == 0)
+                 line[0] == '#')
+        {
+            // Remove #if, #else, #pragma etc, leaving only
+            // #define, #file and #endfile. and also lines
+            // which are not part of this configuration.
             line = "";
+        }
 
         ret << line << "\n";
     }

test/testpreprocessor.cpp

@@ -108,6 +108,7 @@ private:
 
         TEST_CASE(stringify);
         TEST_CASE(ifdefwithfile);
+        TEST_CASE(pragma);
     }
 
 
@@ -750,6 +751,23 @@ private:
         ASSERT_EQUALS("\n\"abc\"", actual);
     }
 
+    void pragma()
+    {
+        const char filedata[] = "#pragma once\n"
+                                "void f()\n"
+                                "{\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("\nvoid f()\n{\n}\n", actual[""]);
+    }
 };
 
 REGISTER_TEST(TestPreprocessor)