Working on lexer first

os.cpp

@@ -0,0 +1,27 @@
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdio.h>
+#include <windows.h>
+#include "types.h"
+
+function S32 os_main();
+
+LRESULT CALLBACK 
+WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam){
+  return DefWindowProcW(hwnd, uMsg, wParam, lParam);;
+}
+
+int
+WinMain(HINSTANCE hInstance, HINSTANCE a, LPSTR b, int nShowCmd){
+  wchar_t *CLASS_NAME  = L"Cool window class";
+  wchar_t *WINDOW_NAME = L"Have a good day!";
+  
+  WNDCLASSW wc = { };
+  wc.lpfnWndProc   = WindowProc;
+  wc.hInstance     = hInstance;
+  wc.lpszClassName = CLASS_NAME;
+  RegisterClassW(&wc);
+  
+  HWND window_handle = CreateWindowExW(0, CLASS_NAME, WINDOW_NAME, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 0, 0, hInstance, 0);
+  ShowWindow(window_handle, nShowCmd);
+  return os_main();
+}