read file

src/main.cpp

diff --git a/src/main.cpp b/src/main.cpp
index 87f8949..478f3ce 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,10 +1,27 @@
 // #include <iostream>
 #include "rapidjson/document.h"
 #include <cstdio>
+#include <fstream>
+#include <string>
+#include <exception>
+
+std::string read_file(const char* filename) {
+    std::ifstream input_file(filename);
+    if(input_file.good()) {
+        std::string json_str(
+            (std::istreambuf_iterator<char>(input_file)),
+            std::istreambuf_iterator<char>()
+        );
+        return json_str;
+    } else {
+        std::printf("Error reading file %s", filename);
+        throw std::exception();
+    }
+}
 
 int main(int, char* argv[]) {
     const char* filename = argv[1];
-    // std::cout << filename << std::cou;
-    // std::printf("Hello, world!\n");
-    std::printf("%s", filename);
+    std::string json = read_file(filename);
+    // std::printf("%s\n", json.c_str());
+    // std::printf("%s", json.c_str());
 }