1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1987, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __SCCSID("@(#)disklabel.c 8.2 (Berkeley) 5/3/95"); 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #define DKTYPENAMES 38 #define FSTYPENAMES 39 #include <sys/disklabel.h> 40 41 #include <fcntl.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <ctype.h> 47 48 static int 49 gettype(char *t, const char **names) 50 { 51 const char **nm; 52 53 for (nm = names; *nm; nm++) 54 if (strcasecmp(t, *nm) == 0) 55 return (nm - names); 56 if (isdigit((unsigned char)*t)) 57 return (atoi(t)); 58 return (0); 59 } 60 61 struct disklabel * 62 getdiskbyname(const char *name) 63 { 64 static struct disklabel disk; 65 struct disklabel *dp = &disk; 66 struct partition *pp; 67 char *buf; 68 char *db_array[2] = { _PATH_DISKTAB, 0 }; 69 char *cp, *cq; /* can't be register */ 70 char p, max, psize[3], pbsize[3], 71 pfsize[3], poffset[3], ptype[3]; 72 u_int32_t *dx; 73 74 if (cgetent(&buf, db_array, (char *) name) < 0) 75 return NULL; 76 77 bzero((char *)&disk, sizeof(disk)); 78 /* 79 * typename 80 */ 81 cq = dp->d_typename; 82 cp = buf; 83 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 && 84 (*cq = *cp) && *cq != '|' && *cq != ':') 85 cq++, cp++; 86 *cq = '\0'; 87 88 if (cgetstr(buf, "ty", &cq) > 0) { 89 if (strcmp(cq, "removable") == 0) 90 dp->d_flags |= D_REMOVABLE; 91 else if (cq && strcmp(cq, "simulated") == 0) 92 dp->d_flags |= D_RAMDISK; 93 free(cq); 94 } 95 if (cgetcap(buf, "sf", ':') != NULL) 96 dp->d_flags |= D_BADSECT; 97 98 #define getnumdflt(field, dname, dflt) \ 99 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; } 100 101 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 102 getnumdflt(dp->d_ntracks, "nt", 0); 103 getnumdflt(dp->d_nsectors, "ns", 0); 104 getnumdflt(dp->d_ncylinders, "nc", 0); 105 106 if (cgetstr(buf, "dt", &cq) > 0) { 107 dp->d_type = gettype(cq, dktypenames); 108 free(cq); 109 } else 110 getnumdflt(dp->d_type, "dt", 0); 111 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 112 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 113 getnumdflt(dp->d_rpm, "rm", 3600); 114 getnumdflt(dp->d_interleave, "il", 1); 115 getnumdflt(dp->d_trackskew, "sk", 0); 116 getnumdflt(dp->d_cylskew, "cs", 0); 117 getnumdflt(dp->d_headswitch, "hs", 0); 118 getnumdflt(dp->d_trkseek, "ts", 0); 119 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 120 getnumdflt(dp->d_sbsize, "sb", 0); 121 strcpy(psize, "px"); 122 strcpy(pbsize, "bx"); 123 strcpy(pfsize, "fx"); 124 strcpy(poffset, "ox"); 125 strcpy(ptype, "tx"); 126 max = 'a' - 1; 127 pp = &dp->d_partitions[0]; 128 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { 129 long l; 130 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 131 if (cgetnum(buf, psize, &l) == -1) 132 pp->p_size = 0; 133 else { 134 pp->p_size = l; 135 cgetnum(buf, poffset, &l); 136 pp->p_offset = l; 137 getnumdflt(pp->p_fsize, pfsize, 0); 138 if (pp->p_fsize) { 139 long bsize; 140 141 if (cgetnum(buf, pbsize, &bsize) == 0) 142 pp->p_frag = bsize / pp->p_fsize; 143 else 144 pp->p_frag = 8; 145 } 146 getnumdflt(pp->p_fstype, ptype, 0); 147 if (pp->p_fstype == 0) 148 if (cgetstr(buf, ptype, &cq) >= 0) { 149 pp->p_fstype = gettype(cq, fstypenames); 150 free(cq); 151 } 152 max = p; 153 } 154 } 155 dp->d_npartitions = max + 1 - 'a'; 156 (void)strcpy(psize, "dx"); 157 dx = dp->d_drivedata; 158 for (p = '0'; p < '0' + NDDATA; p++, dx++) { 159 psize[1] = p; 160 getnumdflt(*dx, psize, 0); 161 } 162 dp->d_magic = DISKMAGIC; 163 dp->d_magic2 = DISKMAGIC; 164 free(buf); 165 return (dp); 166 } 167