main.cpp: error out when file/path provided by -I or -include=, or the input do not exist

Author: firewave

main.cpp

@@ -9,6 +9,7 @@
 #include <cstring>
 #include <fstream>
 #include <iostream>
+#include <sys/stat.h>
 #include <string>
 #include <vector>
 
@@ -95,6 +96,32 @@ int main(int argc, char **argv)
         return 1;
     }
 
+    // TODO: move this logic into simplecpp?
+    {
+        bool inc_missing = false;
+        for (const std::string& inc : dui.includes) {
+            std::fstream f(inc, std::ios::in|std::ios::out); // check if this is an existing file
+            if (!f.is_open()) {
+                inc_missing = true;
+                std::cout << "error: could not open include '" << inc << "'" << std::endl;
+            }
+        }
+        if (inc_missing)
+            return 1;
+    }
+    {
+        bool inc_missing = false;
+        for (const std::string& inc : dui.includePaths) {
+            struct stat file_stat;
+            if ((stat(inc.c_str(), &file_stat) == -1) || ((file_stat.st_mode & S_IFMT) != S_IFDIR)) {
+                inc_missing = true;
+                std::cout << "error: could not find include path '" << inc << "'" << std::endl;
+            }
+        }
+        if (inc_missing)
+            return 1;
+    }
+
     if (!filename) {
         std::cout << "Syntax:" << std::endl;
         std::cout << "simplecpp [options] filename" << std::endl;
@@ -117,7 +144,7 @@ int main(int argc, char **argv)
     std::vector<std::string> files;
     simplecpp::TokenList *rawtokens;
     if (use_istream) {
-        std::ifstream f(filename);
+        std::ifstream f(filename, std::ios::in|std::ios::out);
         if (!f.is_open()) {
             std::cout << "error: could not open file '" << filename << "'" << std::endl;
             return 1;