/*
 * $Id: ioccom.h,v 1.4 2006-01-08 12:06:14 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Neither the name of Olaf Barthel nor the names of contributors
 *     may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************
 *
 * Documentation and source code for this library, and the most recent library
 * build are available from <http://sourceforge.net/projects/clib2>.
 *
 *****************************************************************************
 */

#ifndef _SYS_IOCCOM_H
#define _SYS_IOCCOM_H

/****************************************************************************/

/* The following is not part of the ISO 'C' (1994) standard. */

/****************************************************************************/

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/****************************************************************************/

#define	IOCPARM_MASK	0x1fff		/* parameter length, at most 13 bits */
#define	IOCPARM_LEN(x)	(((x) >> 16) & IOCPARM_MASK)
#define	IOCBASECMD(x)	((x) & ~(IOCPARM_MASK << 16))
#define	IOCGROUP(x)		(((x) >> 8) & 0xff)

#define	IOCPARM_MAX	NBPG	/* max size of ioctl args, mult. of NBPG */

#define	IOC_VOID	(0x20000000UL)		/* no parameters */
#define	IOC_OUT		(0x40000000UL)		/* copy parameters out */
#define	IOC_IN		(0x80000000UL)		/* copy parameters in */
#define	IOC_INOUT	(IOC_IN|IOC_OUT)	/* copy paramters in and out */
#define	IOC_DIRMASK	(0xe0000000UL)		/* mask for IN/OUT/VOID */

#define	_IOC(inout,group,num,len) \
	(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))

#define	_IO(g,n)		_IOC(IOC_VOID,	(g), (n), 0)
#define	_IOR(g,n,t)		_IOC(IOC_OUT,	(g), (n), sizeof(t))
#define	_IOW(g,n,t)		_IOC(IOC_IN,	(g), (n), sizeof(t))
#define	_IOWR(g,n,t)	_IOC(IOC_INOUT,	(g), (n), sizeof(t))

/****************************************************************************/

#ifdef __cplusplus
}
#endif /* __cplusplus */

/****************************************************************************/

#endif /* _SYS_IOCCOM_H */
