/***************************************************************************
                          lib/ibSpb.c
                             -------------------

    copyright            : (C) 2017 by Dave Penkler
    email                : dpenkler@gmail.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "ib_internal.h"

int internal_ibspb(ibConf_t *conf, short *sp_bytes)
{
	int retval;
	ibBoard_t *board;
	struct gpib_spoll_bytes_ioctl spb;
	if (conf->is_interface) {
		setIberr(EARG);
		return -1;
	}

	board = interfaceBoard(conf);

	spb.pad = conf->settings.pad;
	spb.sad = conf->settings.sad;

	retval = ioctl(board->fileno, IBSPOLL_BYTES, &spb);
	if (retval < 0)	{
		switch (errno) {
			default:
				setIbcnt(errno);
				setIberr(EDVR);
				break;
		}
		return -1;
	}
	*sp_bytes = spb.num_bytes;
	return 0;
}

int ibspb(int ud, short *sp_bytes)
{
	ibConf_t *conf;
	int retval;

	conf = general_enter_library(ud, 1, 1);
	if (conf == NULL)
		return general_exit_library(ud, 1, 0, 0, 0, 0, 1);

	retval = internal_ibspb(conf, sp_bytes);
	if (retval < 0)
		return general_exit_library(ud, 1, 0, 0, 0, 0, 1);

	return general_exit_library(ud, 0, 0, 0, 0, 0, 1);
}
