Split sources, made separate headers

Makefile will autogenerate library header, excluding lines containing "@exclude"

src/fdistream.hpp

@@ -0,0 +1,37 @@
+#ifndef FDISTREAM_H_
+#define FDISTREAM_H_
+
+#include <iostream>
+#include "fdiobuf.hpp" // @exclude
+
+namespace sc {
+    namespace io {
+        class fdistream : public std::istream {
+            public:
+                fdistream() : std::istream(&_inbuf), _inbuf(-1) {}
+                fdistream(int fd) : std::istream(&_inbuf), _inbuf(fd) {}
+
+                // no copying
+                fdistream(const fdistream&) = delete;
+                fdistream& operator=(const fdistream&) = delete;
+
+                // moving allowed
+                fdistream(fdistream&& other);
+                fdistream& operator=(fdistream&& other);
+
+                // cleanup: fdistream is RAII class for open file descriptor
+                virtual ~fdistream();
+
+                int fd() const { return _inbuf.fd(); }
+                void fd(int fd) { _inbuf.fd(fd); }
+
+                bool is_open() const { return _inbuf.fd() != -1; }
+                void close();
+
+            protected:
+                fdiobuf _inbuf;
+        };
+    }
+}
+
+#endif // FDISTREAM_H_