do not add empty filename to files in preprocess() (#350)

Author: firewave

simplecpp.cpp

@@ -3274,6 +3274,9 @@ void simplecpp::preprocess(simplecpp::TokenList &output, const simplecpp::TokenL
     sizeOfType.insert(std::make_pair("double *", sizeof(double *)));
     sizeOfType.insert(std::make_pair("long double *", sizeof(long double *)));
 
+    // use a dummy vector for the macros because as this is not part of the file and would add an empty entry - e.g. /usr/include/poll.h
+    std::vector<std::string> dummy;
+
     const bool hasInclude = (dui.std.size() == 5 && dui.std.compare(0,3,"c++") == 0 && dui.std >= "c++17");
     MacroMap macros;
     for (std::list<std::string>::const_iterator it = dui.defines.begin(); it != dui.defines.end(); ++it) {
@@ -3285,26 +3288,26 @@ void simplecpp::preprocess(simplecpp::TokenList &output, const simplecpp::TokenL
             continue;
         const std::string lhs(macrostr.substr(0,eq));
         const std::string rhs(eq==std::string::npos ? std::string("1") : macrostr.substr(eq+1));
-        const Macro macro(lhs, rhs, files);
+        const Macro macro(lhs, rhs, dummy);
         macros.insert(std::pair<TokenString,Macro>(macro.name(), macro));
     }
 
-    macros.insert(std::make_pair("__FILE__", Macro("__FILE__", "__FILE__", files)));
-    macros.insert(std::make_pair("__LINE__", Macro("__LINE__", "__LINE__", files)));
-    macros.insert(std::make_pair("__COUNTER__", Macro("__COUNTER__", "__COUNTER__", files)));
+    macros.insert(std::make_pair("__FILE__", Macro("__FILE__", "__FILE__", dummy)));
+    macros.insert(std::make_pair("__LINE__", Macro("__LINE__", "__LINE__", dummy)));
+    macros.insert(std::make_pair("__COUNTER__", Macro("__COUNTER__", "__COUNTER__", dummy)));
     struct tm ltime = {};
     getLocaltime(ltime);
-    macros.insert(std::make_pair("__DATE__", Macro("__DATE__", getDateDefine(&ltime), files)));
-    macros.insert(std::make_pair("__TIME__", Macro("__TIME__", getTimeDefine(&ltime), files)));
+    macros.insert(std::make_pair("__DATE__", Macro("__DATE__", getDateDefine(&ltime), dummy)));
+    macros.insert(std::make_pair("__TIME__", Macro("__TIME__", getTimeDefine(&ltime), dummy)));
 
     if (!dui.std.empty()) {
         std::string std_def = simplecpp::getCStdString(dui.std);
         if (!std_def.empty()) {
-            macros.insert(std::make_pair("__STDC_VERSION__", Macro("__STDC_VERSION__", std_def, files)));
+            macros.insert(std::make_pair("__STDC_VERSION__", Macro("__STDC_VERSION__", std_def, dummy)));
         } else {
             std_def = simplecpp::getCppStdString(dui.std);
             if (!std_def.empty())
-                macros.insert(std::make_pair("__cplusplus", Macro("__cplusplus", std_def, files)));
+                macros.insert(std::make_pair("__cplusplus", Macro("__cplusplus", std_def, dummy)));
         }
     }
 

test.cpp

@@ -2714,6 +2714,44 @@ static void token()
     ASSERT_TOKEN("+22", false, true, false);
 }
 
+static void preprocess_files()
+{
+    {
+        const char code[] = "#define A";
+        std::vector<std::string> files;
+
+        const simplecpp::TokenList tokens = makeTokenList(code, files);
+        ASSERT_EQUALS(1, files.size());
+        ASSERT_EQUALS("", *files.cbegin());
+
+        simplecpp::TokenList tokens2(files);
+        ASSERT_EQUALS(1, files.size());
+        ASSERT_EQUALS("", *files.cbegin());
+
+        std::map<std::string, simplecpp::TokenList*> filedata;
+        simplecpp::preprocess(tokens2, tokens, files, filedata, simplecpp::DUI(), nullptr);
+        ASSERT_EQUALS(1, files.size());
+        ASSERT_EQUALS("", *files.cbegin());
+    }
+    {
+        const char code[] = "#define A";
+        std::vector<std::string> files;
+
+        const simplecpp::TokenList tokens = makeTokenList(code, files, "test.cpp");
+        ASSERT_EQUALS(1, files.size());
+        ASSERT_EQUALS("test.cpp", *files.cbegin());
+
+        simplecpp::TokenList tokens2(files);
+        ASSERT_EQUALS(1, files.size());
+        ASSERT_EQUALS("test.cpp", *files.cbegin());
+
+        std::map<std::string, simplecpp::TokenList*> filedata;
+        simplecpp::preprocess(tokens2, tokens, files, filedata, simplecpp::DUI(), nullptr);
+        ASSERT_EQUALS(1, files.size());
+        ASSERT_EQUALS("test.cpp", *files.cbegin());
+    }
+}
+
 static void fuzz_crash()
 {
     {
@@ -2949,6 +2987,8 @@ int main(int argc, char **argv)
 
     TEST_CASE(token);
 
+    TEST_CASE(preprocess_files);
+
     TEST_CASE(fuzz_crash);
 
     return numberOfFailedAssertions > 0 ? EXIT_FAILURE : EXIT_SUCCESS;