/*
* 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);
}
}