text: // https://github.com/kripken/emscripten/issues/2334
  
  #include <fstream>
  #include <iostream>
  #include <string>
  
  #include <emscripten/emscripten.h>
  
  int main()
  {
      EM_ASM(
          FS.writeFile("testfile", "a=1\nb=2\n");
          FS.writeFile("testfile", new Uint8Array([99, 61, 51]) /* c=3 */, { flags: "a" });
      );
  
      std::ifstream file("testfile");
  
      while(!file.eof() && !file.fail())
      {
          std::string line;
          getline(file, line);
          std::string name;
  
          std::cout << "read " << line << std::endl;
  
          size_t equalsPos = 1;
  
          size_t notSpace = line.find_first_not_of(" \t", equalsPos);
  
          if(notSpace != std::string::npos && notSpace != equalsPos)
          {
              line.erase(std::remove_if(line.begin(), line.begin() + notSpace, isspace), line.end());
  
              equalsPos = line.find('=');
          }
  
          if(equalsPos == std::string::npos)
              continue;
  
          name = line.substr(0, equalsPos);
      }
  
      return 0;
  }
  