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+Input/output stream
+===================
+
+To enable interaction with interpreter, basic input/output stream abstraction
+is needed. This implementation uses platform specific functions defined
+by architecture abstraction layer.
+
+
+Input stream
+------------
+
+Input stream provides functionality of reading unsigned 8bit integers
+representing input characters. Implementation utilized `lsp_stream_getchar_t`
+function pointer provided during input stream initialization. Together with
+`lsp_in_stream_read`, used for reading next available input character, input
+stream contains single character buffer used for implementation of
+`lsp_in_stream_peek` functionality.
+
+
+Output stream
+-------------
+
+Output stream provides functionality regarding writing character data.
+It uses `lsp_stream_putchar_t` function pointer provided during output stream
+initialization. Available functions include:
+
+    * `lsp_out_stream_write`
+
+        Write single character to output stream.
+
+    * `lsp_out_stream_write_str`
+
+        Write null terminated character sequence.
+
+    * `lsp_out_stream_write_int`
+
+        Write string representation of signed integer.
+
+
+Source code
+-----------
+
+stream.h
+''''''''
+
+.. literalinclude:: ../src_c/stream.h
+    :language: c
+
+
+stream.c
+''''''''
+
+.. literalinclude:: ../src_c/stream.c
+    :language: c