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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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6812
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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6812
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/* Copyright (c) 1988 AT&T */
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/* All Rights Reserved */
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#pragma ident "%Z%%M% %I% %E% SMI"
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#include "lint.h"
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#include <sys/types.h>
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#include <sys/mkdev.h>
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#include <errno.h>
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/*
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* Create a formatted device number
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*/
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dev_t
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__makedev(const int version, const major_t majdev, const minor_t mindev)
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{
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dev_t devnum;
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switch (version) {
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case OLDDEV:
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if (majdev > OMAXMAJ || mindev > OMAXMIN) {
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errno = EINVAL;
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return ((o_dev_t)NODEV);
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}
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devnum = ((majdev << ONBITSMINOR) | mindev);
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break;
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case NEWDEV:
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#if MAXMAJ != 0xfffffffful /* assumes major_t == uint32_t */
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if (majdev > MAXMAJ) {
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errno = EINVAL;
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return (NODEV);
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}
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#endif
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#if MAXMIN != 0xfffffffful /* assumes minor_t == uint32_t */
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if (mindev > MAXMIN) {
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errno = EINVAL;
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return (NODEV);
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}
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#endif
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if ((devnum = (((dev_t)majdev << NBITSMINOR) |
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mindev)) == NODEV) {
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errno = EINVAL;
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return (NODEV);
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}
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break;
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default:
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errno = EINVAL;
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return (NODEV);
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}
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return (devnum);
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}
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/*
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* Return major number part of formatted device number
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*/
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major_t
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__major(const int version, const dev_t devnum)
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{
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major_t maj;
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switch (version) {
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case OLDDEV:
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maj = (devnum >> ONBITSMINOR);
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if (devnum == NODEV || maj > OMAXMAJ) {
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errno = EINVAL;
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return ((major_t)NODEV);
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}
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break;
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case NEWDEV:
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maj = (devnum >> NBITSMINOR);
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if (devnum == NODEV) {
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errno = EINVAL;
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return ((major_t)NODEV);
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}
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#if MAXMAJ != 0xfffffffful /* assumes major_t == uint32_t */
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if (maj > MAXMAJ) {
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errno = EINVAL;
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return ((major_t)NODEV);
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}
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#endif
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break;
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default:
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errno = EINVAL;
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return ((major_t)NODEV);
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}
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return (maj);
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}
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/*
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* Return minor number part of formatted device number
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*/
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minor_t
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__minor(const int version, const dev_t devnum)
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{
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switch (version) {
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case OLDDEV:
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if (devnum == NODEV) {
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errno = EINVAL;
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return ((minor_t)NODEV);
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}
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return (devnum & OMAXMIN);
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case NEWDEV:
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if (devnum == NODEV) {
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errno = EINVAL;
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return ((minor_t)NODEV);
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}
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return (devnum & MAXMIN);
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default:
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errno = EINVAL;
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return ((minor_t)NODEV);
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}
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}
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