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pack_dev.c revision 1.1 
      1 /*	$NetBSD: pack_dev.c,v 1.1 2001/10/08 04:45:30 lukem 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 #ifndef lint
     41 __RCSID("$NetBSD: pack_dev.c,v 1.1 2001/10/08 04:45:30 lukem 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 <unistd.h>
     52 #include <string.h>
     53 
     54 #include "pack_dev.h"
     55 
     56 static	pack_t	pack_netbsd;
     57 static	pack_t	pack_freebsd;
     58 static	pack_t	pack_8_8;
     59 static	pack_t	pack_12_20;
     60 static	pack_t	pack_14_18;
     61 static	pack_t	pack_8_24;
     62 static	pack_t	pack_bsdos;
     63 static	int	compare_format(const void *, const void *);
     64 
     65 
     66 	/* exported */
     67 dev_t
     68 pack_native(int n, u_long numbers[])
     69 {
     70 	dev_t dev;
     71 
     72 	if (n == 2) {
     73 		dev = makedev(numbers[0], numbers[1]);
     74 		if (major(dev) != numbers[0])
     75 			errx(1, "invalid major number");
     76 		if (minor(dev) != numbers[1])
     77 			errx(1, "invalid minor number");
     78 	} else
     79 		errx(1, "too many fields for format");
     80 	return (dev);
     81 }
     82 
     83 
     84 #define	major_netbsd(x)		((int32_t)((((x) & 0x000fff00) >>  8)))
     85 #define	minor_netbsd(x)		((int32_t)((((x) & 0xfff00000) >> 12) | \
     86 					   (((x) & 0x000000ff) >>  0)))
     87 #define	makedev_netbsd(x,y)	((dev_t)((((x) <<  8) & 0x000fff00) | \
     88 					 (((y) << 12) & 0xfff00000) | \
     89 					 (((y) <<  0) & 0x000000ff)))
     90 
     91 static dev_t
     92 pack_netbsd(int n, u_long numbers[])
     93 {
     94 	dev_t dev;
     95 
     96 	if (n == 2) {
     97 		dev = makedev_netbsd(numbers[0], numbers[1]);
     98 		if (major_netbsd(dev) != numbers[0])
     99 			errx(1, "invalid major number");
    100 		if (minor_netbsd(dev) != numbers[1])
    101 			errx(1, "invalid minor number");
    102 	} else
    103 		errx(1, "too many fields for format");
    104 	return (dev);
    105 }
    106 
    107 
    108 #define	major_freebsd(x)	((int32_t)(((x) & 0x0000ff00) >> 8))
    109 #define	minor_freebsd(x)	((int32_t)(((x) & 0xffff00ff) >> 0))
    110 #define	makedev_freebsd(x,y)	((dev_t)((((x) << 8) & 0x0000ff00) | \
    111 					 (((y) << 0) & 0xffff00ff)))
    112 
    113 static dev_t
    114 pack_freebsd(int n, u_long numbers[])
    115 {
    116 	dev_t dev;
    117 
    118 	if (n == 2) {
    119 		dev = makedev_freebsd(numbers[0], numbers[1]);
    120 		if (major_freebsd(dev) != numbers[0])
    121 			errx(1, "invalid major number");
    122 		if (minor_freebsd(dev) != numbers[1])
    123 			errx(1, "invalid minor number");
    124 	} else
    125 		errx(1, "too many fields for format");
    126 	return (dev);
    127 }
    128 
    129 
    130 #define	major_8_8(x)		((int32_t)(((x) & 0x0000ff00) >> 8))
    131 #define	minor_8_8(x)		((int32_t)(((x) & 0x000000ff) >> 0))
    132 #define	makedev_8_8(x,y)	((dev_t)((((x) << 8) & 0x0000ff00) | \
    133 					 (((y) << 0) & 0x000000ff)))
    134 
    135 static dev_t
    136 pack_8_8(int n, u_long numbers[])
    137 {
    138 	dev_t dev;
    139 
    140 	if (n == 2) {
    141 		dev = makedev_8_8(numbers[0], numbers[1]);
    142 		if (major_8_8(dev) != numbers[0])
    143 			errx(1, "invalid major number");
    144 		if (minor_8_8(dev) != numbers[1])
    145 			errx(1, "invalid minor number");
    146 	} else
    147 		errx(1, "too many fields for format");
    148 	return (dev);
    149 }
    150 
    151 
    152 #define	major_12_20(x)		((int32_t)(((x) & 0xfff00000) >> 20))
    153 #define	minor_12_20(x)		((int32_t)(((x) & 0x000fffff) >>  0))
    154 #define	makedev_12_20(x,y)	((dev_t)((((x) << 20) & 0xfff00000) | \
    155 					 (((y) <<  0) & 0x000fffff)))
    156 
    157 static dev_t
    158 pack_12_20(int n, u_long numbers[])
    159 {
    160 	dev_t dev;
    161 
    162 	if (n == 2) {
    163 		dev = makedev_12_20(numbers[0], numbers[1]);
    164 		if (major_12_20(dev) != numbers[0])
    165 			errx(1, "invalid major number");
    166 		if (minor_12_20(dev) != numbers[1])
    167 			errx(1, "invalid minor number");
    168 	} else
    169 		errx(1, "too many fields for format");
    170 	return (dev);
    171 }
    172 
    173 
    174 #define	major_14_18(x)		((int32_t)(((x) & 0xfffc0000) >> 18))
    175 #define	minor_14_18(x)		((int32_t)(((x) & 0x0003ffff) >>  0))
    176 #define	makedev_14_18(x,y)	((dev_t)((((x) << 18) & 0xfffc0000) | \
    177 					 (((y) <<  0) & 0x0003ffff)))
    178 
    179 static dev_t
    180 pack_14_18(int n, u_long numbers[])
    181 {
    182 	dev_t dev;
    183 
    184 	if (n == 2) {
    185 		dev = makedev_14_18(numbers[0], numbers[1]);
    186 		if (major_14_18(dev) != numbers[0])
    187 			errx(1, "invalid major number");
    188 		if (minor_14_18(dev) != numbers[1])
    189 			errx(1, "invalid minor number");
    190 	} else
    191 		errx(1, "too many fields for format");
    192 	return (dev);
    193 }
    194 
    195 
    196 #define	major_8_24(x)		((int32_t)(((x) & 0xff000000) >> 24))
    197 #define	minor_8_24(x)		((int32_t)(((x) & 0x00ffffff) >>  0))
    198 #define	makedev_8_24(x,y)	((dev_t)((((x) << 24) & 0xff000000) | \
    199 					 (((y) <<  0) & 0x00ffffff)))
    200 
    201 static dev_t
    202 pack_8_24(int n, u_long numbers[])
    203 {
    204 	dev_t dev;
    205 
    206 	if (n == 2) {
    207 		dev = makedev_8_24(numbers[0], numbers[1]);
    208 		if (major_8_24(dev) != numbers[0])
    209 			errx(1, "invalid major number");
    210 		if (minor_8_24(dev) != numbers[1])
    211 			errx(1, "invalid minor number");
    212 	} else
    213 		errx(1, "too many fields for format");
    214 	return (dev);
    215 }
    216 
    217 
    218 #define	major_12_12_8(x)	((int32_t)(((x) & 0xfff00000) >> 20))
    219 #define	unit_12_12_8(x)		((int32_t)(((x) & 0x000fff00) >>  8))
    220 #define	subunit_12_12_8(x)	((int32_t)(((x) & 0x000000ff) >>  0))
    221 #define	makedev_12_12_8(x,y,z)	((dev_t)((((x) << 20) & 0xfff00000) | \
    222 					 (((y) <<  8) & 0x000fff00) | \
    223 					 (((z) <<  0) & 0x000000ff)))
    224 
    225 static dev_t
    226 pack_bsdos(int n, u_long numbers[])
    227 {
    228 	dev_t dev;
    229 
    230 	if (n == 2) {
    231 		dev = makedev_12_20(numbers[0], numbers[1]);
    232 		if (major_12_20(dev) != numbers[0])
    233 			errx(1, "invalid major number");
    234 		if (minor_12_20(dev) != numbers[1])
    235 			errx(1, "invalid minor number");
    236 	} else if (n == 3) {
    237 		dev = makedev_12_12_8(numbers[0], numbers[1], numbers[2]);
    238 		if (major_12_12_8(dev) != numbers[0])
    239 			errx(1, "invalid major number");
    240 		if (unit_12_12_8(dev) != numbers[1])
    241 			errx(1, "invalid unit number");
    242 		if (subunit_12_12_8(dev) != numbers[2])
    243 			errx(1, "invalid subunit number");
    244 	} else
    245 		errx(1, "too many fields for format");
    246 	return (dev);
    247 }
    248 
    249 
    250 		/* list of formats and pack functions */
    251 		/* this list must be sorted lexically */
    252 struct format {
    253 	const char	*name;
    254 	pack_t		*pack;
    255 } formats[] = {
    256 	{"386bsd",  pack_8_8},
    257 	{"4bsd",    pack_8_8},
    258 	{"bsdos",   pack_bsdos},
    259 	{"freebsd", pack_freebsd},
    260 	{"hpux",    pack_8_24},
    261 	{"isc",     pack_8_8},
    262 	{"linux",   pack_8_8},
    263 	{"native",  pack_native},
    264 	{"netbsd",  pack_netbsd},
    265 	{"osf1",    pack_12_20},
    266 	{"sco",     pack_8_8},
    267 	{"solaris", pack_14_18},
    268 	{"sunos",   pack_8_8},
    269 	{"svr3",    pack_8_8},
    270 	{"svr4",    pack_14_18},
    271 	{"ultrix",  pack_8_8},
    272 };
    273 
    274 static int
    275 compare_format(const void *key, const void *element)
    276 {
    277 	const char		*name;
    278 	const struct format	*format;
    279 
    280 	name = key;
    281 	format = element;
    282 
    283 	return (strcmp(name, format->name));
    284 }
    285 
    286 
    287 pack_t *
    288 pack_find(const char *name)
    289 {
    290 	struct format	*format;
    291 
    292 	format = bsearch(name, formats,
    293 	    sizeof(formats)/sizeof(formats[0]),
    294 	    sizeof(formats[0]), compare_format);
    295 	if (format == 0)
    296 		return (NULL);
    297 	return (format->pack);
    298 }
    299