fmt.cpp

template<typename... Args> safe_buffers std::string format(const char* fmt, Args... args)
{
	std::unique_ptr<char[]> buf(new char[4096]); 
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-security"
	const std::size_t len = snprintf(buf.get(), 4096, fmt, do_unveil(args)...) + 1;
	if (len > 4096) {
		buf.reset(new char[len]);
		snprintf(buf.get(), len, fmt, do_unveil(args)...);
	}
#pragma GCC diagnostic pop

	if (len > INT_MAX)
	{
		throw std::runtime_error("std::snprintf() failed");
	}

	return { buf.get(), buf.get() + len - 1};
}