diff --git a/main.cpp b/main.cpp
@@ -6,12 +6,14 @@
#define SIMPLECPP_TOKENLIST_ALLOW_PTR 0
#include "simplecpp.h"

#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
-#include <sys/stat.h>
#include <string>
#include <utility>
#include <vector>

@@ -28,7 +30,12 @@ int main(int argc, char **argv)
{
    bool error = false;
    const char *filename = nullptr;
-    bool use_istream = false;
    bool fail_on_error = false;
    bool linenrs = false;

@@ -86,9 +93,28 @@ int main(int argc, char **argv)
                        break;
                    }
                    dui.includes.emplace_back(std::move(value));
-                } else if (std::strcmp(arg, "-is")==0) {
                    found = true;
-                    use_istream = true;
                }
                break;
            case 's':
@@ -117,8 +143,8 @@ int main(int argc, char **argv)
                break;
            case 'f':
                if (std::strcmp(arg, "-f")==0) {
-                    found = true;
                    fail_on_error = true;
                }
                break;
            case 'l':
@@ -157,7 +183,7 @@ int main(int argc, char **argv)
        std::cout << "  -UNAME          Undefine NAME." << std::endl;
        std::cout << "  -std=STD        Specify standard." << std::endl;
        std::cout << "  -q              Quiet mode (no output)." << std::endl;
-        std::cout << "  -is             Use std::istream interface." << std::endl;
        std::cout << "  -e              Output errors only." << std::endl;
        std::cout << "  -f              Fail when errors were encountered (exitcode 1)." << std::endl;
        std::cout << "  -l              Print lines numbers." << std::endl;
@@ -197,8 +223,21 @@ int main(int argc, char **argv)
    simplecpp::TokenList outputTokens(files);
    {
        simplecpp::TokenList *rawtokens;
-        if (use_istream) {
-            rawtokens = new simplecpp::TokenList(f, files,filename,&outputList);
        } else {
            f.close();
            rawtokens = new simplecpp::TokenList(filename,files,&outputList);