test.cpp: check for existence before opening file

test.cpp

@@ -16,12 +16,14 @@
  * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "simplecpp.h"
+
 #include <iostream>
 #include <limits>
 #include <fstream>
 #include <sstream>
+#include <stdexcept>
 #include <vector>
-#include "simplecpp.h"
 
 enum Input {
     Stringstream,
@@ -109,6 +111,8 @@ static simplecpp::TokenList makeTokenListFromFstream(const char code[], std::siz
 {
     const std::string tmpfile = writeFile(code, size, filename);
     std::ifstream fin(tmpfile);
+    if (!fin.is_open())
+        throw std::runtime_error("could not open " + tmpfile);
     simplecpp::TokenList tokenList(fin, filenames, tmpfile, outputList);
     remove(tmpfile.c_str());
     return tokenList;
@@ -117,6 +121,9 @@ static simplecpp::TokenList makeTokenListFromFstream(const char code[], std::siz
 static simplecpp::TokenList makeTokenListFromFile(const char code[], std::size_t size, std::vector<std::string> &filenames, const std::string &filename, simplecpp::OutputList *outputList)
 {
     const std::string tmpfile = writeFile(code, size, filename);
+    std::ifstream fin(tmpfile);
+    if (!fin.is_open())
+        throw std::runtime_error("could not open " + tmpfile);
     simplecpp::TokenList tokenList(tmpfile, filenames, outputList);
     remove(tmpfile.c_str());
     return tokenList;