Implemented simple IO for getting keyboard input.

targets/_any/include/os/tools/ringbuffer.hpp

@@ -0,0 +1,44 @@
+
+#pragma once
+
+#if !defined(BAD_APPLE_OS_OS_TOOLS_RINGBUFFER_HPP_INCLUDED)
+#define BAD_APPLE_OS_OS_TOOLS_RINGBUFFER_HPP_INCLUDED
+
+#include <array>
+#include <cstddef>
+
+namespace baos
+{
+template<typename T, std::size_t SIZE>
+class RingBuffer
+{
+private:
+    std::array<T, SIZE> mElements;
+    std::size_t mBufferedElements = 0;
+    std::size_t mPosition = 0;
+public:
+    [[nodiscard]] bool full() const noexcept { return mBufferedElements == SIZE; }
+    [[nodiscard]] bool empty() const noexcept { return mBufferedElements == 0; }
+    bool append(T element) noexcept
+    {
+        if (full()) {
+            return false;
+        }
+        mElements[mPosition] = std::move(element);
+        ++mBufferedElements;
+        mPosition = (mPosition + 1) % SIZE;
+        return true;
+    }
+    bool next(T& outElement) noexcept
+    {
+        if (empty()) {
+            return false;
+        }
+        outElement = std::move(mElements[(mPosition + SIZE - mBufferedElements) % SIZE]);
+        --mBufferedElements;
+        return true;
+    }
+};
+}
+
+#endif // !defined(BAD_APPLE_OS_OS_TOOLS_RINGBUFFER_HPP_INCLUDED)