/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "lint.h"

#include <sys/types.h>

#include <sys/mkdev.h>

#include <errno.h>

/*

 * Create a formatted device number

 */

dev_t

__makedev(const int version, const major_t majdev, const minor_t mindev)

{

	dev_t devnum;

	switch (version) {

	case OLDDEV:

		if (majdev > OMAXMAJ || mindev > OMAXMIN) {

			errno = EINVAL;

			return ((o_dev_t)NODEV);

		}

		devnum = ((majdev << ONBITSMINOR) | mindev);

		break;

	case NEWDEV:

#if MAXMAJ != 0xfffffffful	/* assumes major_t == uint32_t */

		if (majdev > MAXMAJ) {

			errno = EINVAL;

			return (NODEV);

		}

#endif

#if MAXMIN != 0xfffffffful	/* assumes minor_t == uint32_t */

		if (mindev > MAXMIN) {

			errno = EINVAL;

			return (NODEV);

		}

#endif

		if ((devnum = (((dev_t)majdev << NBITSMINOR) |

		    mindev)) == NODEV) {

			errno = EINVAL;

			return (NODEV);

		}

		break;

	default:

		errno = EINVAL;

		return (NODEV);

	}

	return (devnum);

}

/*

 * Return major number part of formatted device number

 */

major_t

__major(const int version, const dev_t devnum)

{

	major_t maj;

	switch (version) {

	case OLDDEV:

		maj = (devnum >> ONBITSMINOR);

		if (devnum == NODEV || maj > OMAXMAJ) {

			errno = EINVAL;

			return ((major_t)NODEV);

		}

		break;

	case NEWDEV:

		maj = (devnum >> NBITSMINOR);

		if (devnum == NODEV) {

			errno = EINVAL;

			return ((major_t)NODEV);

		}

#if MAXMAJ != 0xfffffffful	/* assumes major_t == uint32_t */

		if (maj > MAXMAJ) {

			errno = EINVAL;

			return ((major_t)NODEV);

		}

#endif

		break;

	default:

		errno = EINVAL;

		return ((major_t)NODEV);

	}

	return (maj);

}

/*

 * Return minor number part of formatted device number

 */

minor_t

__minor(const int version, const dev_t devnum)

{

	switch (version) {

	case OLDDEV:

		if (devnum == NODEV) {

			errno = EINVAL;

			return ((minor_t)NODEV);

		}

		return (devnum & OMAXMIN);

	case NEWDEV:

		if (devnum == NODEV) {

			errno = EINVAL;

			return ((minor_t)NODEV);

		}

		return (devnum & MAXMIN);

	default:

		errno = EINVAL;

		return ((minor_t)NODEV);

	}

}