I/o handling routines for reading and writing to a card is generalized and imnplemented here

src/lib/rt/src/rt_io_bus.h

+/* 
+ * Proview   $Id: rt_io_bus.h,v 1.1 2008-02-29 13:06:03 claes Exp $
+ * Copyright (C) 2005 SSAB Oxelsund AB.
+ *
+ * This program is free software; you can redistribute it and/or 
+ * modify it under the terms of the GNU General Public License as 
+ * published by the Free Software Foundation, either version 2 of 
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful 
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License 
+ * along with the program, if not, write to the Free Software 
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef rt_io_bus_h
+#define rt_io_bus_h
+
+/* rt_io_bus.h -- includefile for io bus. */
+
+#ifndef pwr_h
+#include "pwr.h"
+#endif
+
+#ifndef pwr_class_h
+#include "pwr_class.h"
+#endif
+
+#ifndef PWR_BASECLASSES_H
+#include "pwr_baseclasses.h"
+#endif
+
+#ifndef rt_io_supervise_h
+#include "rt_io_supervise.h"
+#endif
+
+#ifndef rt_io_methods_h
+#include "rt_io_methods.h"
+#endif
+
+#ifndef NULL
+#define NULL (void *) 0
+#endif
+
+
+/*----------------------------------------------------------------------------*\
+  Io functions
+\*----------------------------------------------------------------------------*/
+
+
+int is_diag( pwr_tAttrRef *aref);
+
+pwr_tInt32 GetChanSize(pwr_eDataRepEnum rep);
+
+unsigned short swap16(unsigned short in);
+
+unsigned int swap32(unsigned int in);
+
+void io_card_read( 
+  io_tCtx	         ctx,
+  io_sRack	         *rp, 
+  io_sCard	         *cp, 
+  void                   *input_area, 
+  void                   *diag_area,
+  pwr_tByteOrderingEnum  byte_order,
+  pwr_tFloatRepEnum      float_rep
+);
+
+void io_card_write( 
+  io_tCtx	         ctx,
+  io_sCard	         *cp, 
+  void                   *output_area, 
+  pwr_tByteOrderingEnum  byte_order,
+  pwr_tFloatRepEnum      float_rep
+);
+
+#endif