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pack_dev.c revision 1.3 
      1 /*	$NetBSD: pack_dev.c,v 1.3 2002/01/31 22:43:42 tv Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998, 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Charles M. Hannum.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #if defined(__RCSID) && !defined(lint)
     41 __RCSID("$NetBSD: pack_dev.c,v 1.3 2002/01/31 22:43:42 tv Exp $");
     42 #endif /* not lint */
     43 
     44 #include <sys/types.h>
     45 #include <sys/stat.h>
     46 
     47 #include <err.h>
     48 #include <limits.h>
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <string.h>
     52 #include <unistd.h>
     53 
     54 #if HAVE_CONFIG_H
     55 #include "config.h"
     56 #endif
     57 
     58 #include "pack_dev.h"
     59 
     60 static	pack_t	pack_netbsd;
     61 static	pack_t	pack_freebsd;
     62 static	pack_t	pack_8_8;
     63 static	pack_t	pack_12_20;
     64 static	pack_t	pack_14_18;
     65 static	pack_t	pack_8_24;
     66 static	pack_t	pack_bsdos;
     67 static	int	compare_format(const void *, const void *);
     68 
     69 
     70 	/* exported */
     71 dev_t
     72 pack_native(int n, u_long numbers[])
     73 {
     74 	dev_t dev;
     75 
     76 	if (n == 2) {
     77 		dev = makedev(numbers[0], numbers[1]);
     78 		if (major(dev) != numbers[0])
     79 			errx(1, "invalid major number");
     80 		if (minor(dev) != numbers[1])
     81 			errx(1, "invalid minor number");
     82 	} else
     83 		errx(1, "too many fields for format");
     84 	return (dev);
     85 }
     86 
     87 
     88 #define	major_netbsd(x)		((int32_t)((((x) & 0x000fff00) >>  8)))
     89 #define	minor_netbsd(x)		((int32_t)((((x) & 0xfff00000) >> 12) | \
     90 					   (((x) & 0x000000ff) >>  0)))
     91 #define	makedev_netbsd(x,y)	((dev_t)((((x) <<  8) & 0x000fff00) | \
     92 					 (((y) << 12) & 0xfff00000) | \
     93 					 (((y) <<  0) & 0x000000ff)))
     94 
     95 static dev_t
     96 pack_netbsd(int n, u_long numbers[])
     97 {
     98 	dev_t dev;
     99 
    100 	if (n == 2) {
    101 		dev = makedev_netbsd(numbers[0], numbers[1]);
    102 		if (major_netbsd(dev) != numbers[0])
    103 			errx(1, "invalid major number");
    104 		if (minor_netbsd(dev) != numbers[1])
    105 			errx(1, "invalid minor number");
    106 	} else
    107 		errx(1, "too many fields for format");
    108 	return (dev);
    109 }
    110 
    111 
    112 #define	major_freebsd(x)	((int32_t)(((x) & 0x0000ff00) >> 8))
    113 #define	minor_freebsd(x)	((int32_t)(((x) & 0xffff00ff) >> 0))
    114 #define	makedev_freebsd(x,y)	((dev_t)((((x) << 8) & 0x0000ff00) | \
    115 					 (((y) << 0) & 0xffff00ff)))
    116 
    117 static dev_t
    118 pack_freebsd(int n, u_long numbers[])
    119 {
    120 	dev_t dev;
    121 
    122 	if (n == 2) {
    123 		dev = makedev_freebsd(numbers[0], numbers[1]);
    124 		if (major_freebsd(dev) != numbers[0])
    125 			errx(1, "invalid major number");
    126 		if (minor_freebsd(dev) != numbers[1])
    127 			errx(1, "invalid minor number");
    128 	} else
    129 		errx(1, "too many fields for format");
    130 	return (dev);
    131 }
    132 
    133 
    134 #define	major_8_8(x)		((int32_t)(((x) & 0x0000ff00) >> 8))
    135 #define	minor_8_8(x)		((int32_t)(((x) & 0x000000ff) >> 0))
    136 #define	makedev_8_8(x,y)	((dev_t)((((x) << 8) & 0x0000ff00) | \
    137 					 (((y) << 0) & 0x000000ff)))
    138 
    139 static dev_t
    140 pack_8_8(int n, u_long numbers[])
    141 {
    142 	dev_t dev;
    143 
    144 	if (n == 2) {
    145 		dev = makedev_8_8(numbers[0], numbers[1]);
    146 		if (major_8_8(dev) != numbers[0])
    147 			errx(1, "invalid major number");
    148 		if (minor_8_8(dev) != numbers[1])
    149 			errx(1, "invalid minor number");
    150 	} else
    151 		errx(1, "too many fields for format");
    152 	return (dev);
    153 }
    154 
    155 
    156 #define	major_12_20(x)		((int32_t)(((x) & 0xfff00000) >> 20))
    157 #define	minor_12_20(x)		((int32_t)(((x) & 0x000fffff) >>  0))
    158 #define	makedev_12_20(x,y)	((dev_t)((((x) << 20) & 0xfff00000) | \
    159 					 (((y) <<  0) & 0x000fffff)))
    160 
    161 static dev_t
    162 pack_12_20(int n, u_long numbers[])
    163 {
    164 	dev_t dev;
    165 
    166 	if (n == 2) {
    167 		dev = makedev_12_20(numbers[0], numbers[1]);
    168 		if (major_12_20(dev) != numbers[0])
    169 			errx(1, "invalid major number");
    170 		if (minor_12_20(dev) != numbers[1])
    171 			errx(1, "invalid minor number");
    172 	} else
    173 		errx(1, "too many fields for format");
    174 	return (dev);
    175 }
    176 
    177 
    178 #define	major_14_18(x)		((int32_t)(((x) & 0xfffc0000) >> 18))
    179 #define	minor_14_18(x)		((int32_t)(((x) & 0x0003ffff) >>  0))
    180 #define	makedev_14_18(x,y)	((dev_t)((((x) << 18) & 0xfffc0000) | \
    181 					 (((y) <<  0) & 0x0003ffff)))
    182 
    183 static dev_t
    184 pack_14_18(int n, u_long numbers[])
    185 {
    186 	dev_t dev;
    187 
    188 	if (n == 2) {
    189 		dev = makedev_14_18(numbers[0], numbers[1]);
    190 		if (major_14_18(dev) != numbers[0])
    191 			errx(1, "invalid major number");
    192 		if (minor_14_18(dev) != numbers[1])
    193 			errx(1, "invalid minor number");
    194 	} else
    195 		errx(1, "too many fields for format");
    196 	return (dev);
    197 }
    198 
    199 
    200 #define	major_8_24(x)		((int32_t)(((x) & 0xff000000) >> 24))
    201 #define	minor_8_24(x)		((int32_t)(((x) & 0x00ffffff) >>  0))
    202 #define	makedev_8_24(x,y)	((dev_t)((((x) << 24) & 0xff000000) | \
    203 					 (((y) <<  0) & 0x00ffffff)))
    204 
    205 static dev_t
    206 pack_8_24(int n, u_long numbers[])
    207 {
    208 	dev_t dev;
    209 
    210 	if (n == 2) {
    211 		dev = makedev_8_24(numbers[0], numbers[1]);
    212 		if (major_8_24(dev) != numbers[0])
    213 			errx(1, "invalid major number");
    214 		if (minor_8_24(dev) != numbers[1])
    215 			errx(1, "invalid minor number");
    216 	} else
    217 		errx(1, "too many fields for format");
    218 	return (dev);
    219 }
    220 
    221 
    222 #define	major_12_12_8(x)	((int32_t)(((x) & 0xfff00000) >> 20))
    223 #define	unit_12_12_8(x)		((int32_t)(((x) & 0x000fff00) >>  8))
    224 #define	subunit_12_12_8(x)	((int32_t)(((x) & 0x000000ff) >>  0))
    225 #define	makedev_12_12_8(x,y,z)	((dev_t)((((x) << 20) & 0xfff00000) | \
    226 					 (((y) <<  8) & 0x000fff00) | \
    227 					 (((z) <<  0) & 0x000000ff)))
    228 
    229 static dev_t
    230 pack_bsdos(int n, u_long numbers[])
    231 {
    232 	dev_t dev;
    233 
    234 	if (n == 2) {
    235 		dev = makedev_12_20(numbers[0], numbers[1]);
    236 		if (major_12_20(dev) != numbers[0])
    237 			errx(1, "invalid major number");
    238 		if (minor_12_20(dev) != numbers[1])
    239 			errx(1, "invalid minor number");
    240 	} else if (n == 3) {
    241 		dev = makedev_12_12_8(numbers[0], numbers[1], numbers[2]);
    242 		if (major_12_12_8(dev) != numbers[0])
    243 			errx(1, "invalid major number");
    244 		if (unit_12_12_8(dev) != numbers[1])
    245 			errx(1, "invalid unit number");
    246 		if (subunit_12_12_8(dev) != numbers[2])
    247 			errx(1, "invalid subunit number");
    248 	} else
    249 		errx(1, "too many fields for format");
    250 	return (dev);
    251 }
    252 
    253 
    254 		/* list of formats and pack functions */
    255 		/* this list must be sorted lexically */
    256 struct format {
    257 	const char	*name;
    258 	pack_t		*pack;
    259 } formats[] = {
    260 	{"386bsd",  pack_8_8},
    261 	{"4bsd",    pack_8_8},
    262 	{"bsdos",   pack_bsdos},
    263 	{"freebsd", pack_freebsd},
    264 	{"hpux",    pack_8_24},
    265 	{"isc",     pack_8_8},
    266 	{"linux",   pack_8_8},
    267 	{"native",  pack_native},
    268 	{"netbsd",  pack_netbsd},
    269 	{"osf1",    pack_12_20},
    270 	{"sco",     pack_8_8},
    271 	{"solaris", pack_14_18},
    272 	{"sunos",   pack_8_8},
    273 	{"svr3",    pack_8_8},
    274 	{"svr4",    pack_14_18},
    275 	{"ultrix",  pack_8_8},
    276 };
    277 
    278 static int
    279 compare_format(const void *key, const void *element)
    280 {
    281 	const char		*name;
    282 	const struct format	*format;
    283 
    284 	name = key;
    285 	format = element;
    286 
    287 	return (strcmp(name, format->name));
    288 }
    289 
    290 
    291 pack_t *
    292 pack_find(const char *name)
    293 {
    294 	struct format	*format;
    295 
    296 	format = bsearch(name, formats,
    297 	    sizeof(formats)/sizeof(formats[0]),
    298 	    sizeof(formats[0]), compare_format);
    299 	if (format == 0)
    300 		return (NULL);
    301 	return (format->pack);
    302 }
    303