1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include "lint.h" 33 #include <sys/types.h> 34 #include <sys/mkdev.h> 35 #include <errno.h> 36 37 /* 38 * Create a formatted device number 39 */ 40 dev_t 41 __makedev(const int version, const major_t majdev, const minor_t mindev) 42 { 43 dev_t devnum; 44 switch (version) { 45 case OLDDEV: 46 if (majdev > OMAXMAJ || mindev > OMAXMIN) { 47 errno = EINVAL; 48 return ((o_dev_t)NODEV); 49 } 50 devnum = ((majdev << ONBITSMINOR) | mindev); 51 break; 52 53 case NEWDEV: 54 #if MAXMAJ != 0xfffffffful /* assumes major_t == uint32_t */ 55 if (majdev > MAXMAJ) { 56 errno = EINVAL; 57 return (NODEV); 58 } 59 #endif 60 #if MAXMIN != 0xfffffffful /* assumes minor_t == uint32_t */ 61 if (mindev > MAXMIN) { 62 errno = EINVAL; 63 return (NODEV); 64 } 65 #endif 66 if ((devnum = (((dev_t)majdev << NBITSMINOR) | 67 mindev)) == NODEV) { 68 errno = EINVAL; 69 return (NODEV); 70 } 71 break; 72 73 default: 74 errno = EINVAL; 75 return (NODEV); 76 } 77 78 return (devnum); 79 } 80 81 /* 82 * Return major number part of formatted device number 83 */ 84 major_t 85 __major(const int version, const dev_t devnum) 86 { 87 major_t maj; 88 89 switch (version) { 90 case OLDDEV: 91 maj = (devnum >> ONBITSMINOR); 92 if (devnum == NODEV || maj > OMAXMAJ) { 93 errno = EINVAL; 94 return ((major_t)NODEV); 95 } 96 break; 97 98 case NEWDEV: 99 maj = (devnum >> NBITSMINOR); 100 if (devnum == NODEV) { 101 errno = EINVAL; 102 return ((major_t)NODEV); 103 } 104 #if MAXMAJ != 0xfffffffful /* assumes major_t == uint32_t */ 105 if (maj > MAXMAJ) { 106 errno = EINVAL; 107 return ((major_t)NODEV); 108 } 109 #endif 110 break; 111 112 default: 113 errno = EINVAL; 114 return ((major_t)NODEV); 115 } 116 117 return (maj); 118 } 119 120 121 /* 122 * Return minor number part of formatted device number 123 */ 124 minor_t 125 __minor(const int version, const dev_t devnum) 126 { 127 switch (version) { 128 case OLDDEV: 129 if (devnum == NODEV) { 130 errno = EINVAL; 131 return ((minor_t)NODEV); 132 } 133 return (devnum & OMAXMIN); 134 135 case NEWDEV: 136 if (devnum == NODEV) { 137 errno = EINVAL; 138 return ((minor_t)NODEV); 139 } 140 return (devnum & MAXMIN); 141 142 default: 143 errno = EINVAL; 144 return ((minor_t)NODEV); 145 } 146 } 147