Function format

test/test_emscripten_async_wget2.cpp:155–171

this is safe and convenient but not exactly efficient

// this is safe and convenient but not exactly efficient
inline std::string format(const char* fmt, ...){
  int size = 512;
  char* buffer = 0;
  buffer = new char[size];
  va_list vl;
  va_start(vl,fmt);
  int nsize = vsnprintf(buffer, size, fmt, vl);
  if (size <= nsize) {// fail delete buffer and try again
    delete buffer; buffer = 0;
    buffer = new char[nsize+1];//+1 for /0
    nsize = vsnprintf(buffer, size, fmt, vl);
  }
  std::string ret(buffer);
  va_end(vl);
  delete buffer;
  return ret;
}

int http::uid = 0;