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+Result status codes
+===================
+
+This project adopts widely used convention of returning integer encoded status
+codes as function results.
+
+Each function, that needs to notify it's execution status (success or error),
+returns ``lsp_status_t`` (alias for ``lsp_int8_t``).
+
+Available status codes are:
+
+    * ``LSP_SUCCESS``
+
+        Execution successful.
+
+    * ``LSP_EOF``
+
+        End of file encountered during reading/writing.
+
+    * ``LSP_ERR``
+
+        Generic error (unknown error).
+
+    * ``LSP_ERR_MEM``
+
+        Memory error (usually out of memory).
+
+    * ``LSP_ERR_CTX``
+
+        Context error (usually symbol resolution error).
+
+    * ``LSP_ERR_READ``
+
+        Reader error.
+
+    * ``LSP_ERR_WRITE``
+
+        Writer error.
+
+    * ``LSP_ERR_EVAL``
+
+        Evaluation error.
+
+    * ``LSP_ERR_APPLY``
+
+        Application error.
+
+    * ``LSP_ERR_ARG_COUNT``
+
+        Invalid argument count.
+
+    * ``LSP_ERR_ARG_TYPE``
+
+        Invalid argument type.
+
+    * ``LSP_ERR_ARG_VALUE``
+
+        Invalid argument value.
+
+    * ``LSP_ERR_USER``
+
+        Special status value representing beginning of user status codes.
+
+User has ability to raise user error with ``error`` builtin function. This
+error is additionally described with integer value in range [0, 126] and
+encoded as status code.
+
+
+Source code
+-----------
+
+status.h
+''''''''
+
+.. literalinclude:: ../src_c/status.h
+    :language: c