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 #include <sys/param.h> 35 #define DKTYPENAMES 36 #define FSTYPENAMES 37 #include <sys/disklabel.h> 38 39 #include <fcntl.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 #include <ctype.h> 45 46 static int 47 gettype(char *t, const char **names) 48 { 49 const char **nm; 50 51 for (nm = names; *nm; nm++) 52 if (strcasecmp(t, *nm) == 0) 53 return (nm - names); 54 if (isdigit((unsigned char)*t)) 55 return (atoi(t)); 56 return (0); 57 } 58 59 struct disklabel * 60 getdiskbyname(const char *name) 61 { 62 static struct disklabel disk; 63 struct disklabel *dp = &disk; 64 struct partition *pp; 65 char *buf; 66 char *db_array[2] = { _PATH_DISKTAB, 0 }; 67 char *cp, *cq; /* can't be register */ 68 char p, max, psize[3], pbsize[3], 69 pfsize[3], poffset[3], ptype[3]; 70 u_int32_t *dx; 71 72 if (cgetent(&buf, db_array, (char *) name) < 0) 73 return NULL; 74 75 bzero((char *)&disk, sizeof(disk)); 76 /* 77 * typename 78 */ 79 cq = dp->d_typename; 80 cp = buf; 81 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 && 82 (*cq = *cp) && *cq != '|' && *cq != ':') 83 cq++, cp++; 84 *cq = '\0'; 85 86 if (cgetstr(buf, "ty", &cq) > 0) { 87 if (strcmp(cq, "removable") == 0) 88 dp->d_flags |= D_REMOVABLE; 89 else if (cq && strcmp(cq, "simulated") == 0) 90 dp->d_flags |= D_RAMDISK; 91 free(cq); 92 } 93 if (cgetcap(buf, "sf", ':') != NULL) 94 dp->d_flags |= D_BADSECT; 95 96 #define getnumdflt(field, dname, dflt) \ 97 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; } 98 99 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 100 getnumdflt(dp->d_ntracks, "nt", 0); 101 getnumdflt(dp->d_nsectors, "ns", 0); 102 getnumdflt(dp->d_ncylinders, "nc", 0); 103 104 if (cgetstr(buf, "dt", &cq) > 0) { 105 dp->d_type = gettype(cq, dktypenames); 106 free(cq); 107 } else 108 getnumdflt(dp->d_type, "dt", 0); 109 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 110 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 111 getnumdflt(dp->d_rpm, "rm", 3600); 112 getnumdflt(dp->d_interleave, "il", 1); 113 getnumdflt(dp->d_trackskew, "sk", 0); 114 getnumdflt(dp->d_cylskew, "cs", 0); 115 getnumdflt(dp->d_headswitch, "hs", 0); 116 getnumdflt(dp->d_trkseek, "ts", 0); 117 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 118 getnumdflt(dp->d_sbsize, "sb", 0); 119 strcpy(psize, "px"); 120 strcpy(pbsize, "bx"); 121 strcpy(pfsize, "fx"); 122 strcpy(poffset, "ox"); 123 strcpy(ptype, "tx"); 124 max = 'a' - 1; 125 pp = &dp->d_partitions[0]; 126 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { 127 long l; 128 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 129 if (cgetnum(buf, psize, &l) == -1) 130 pp->p_size = 0; 131 else { 132 pp->p_size = l; 133 cgetnum(buf, poffset, &l); 134 pp->p_offset = l; 135 getnumdflt(pp->p_fsize, pfsize, 0); 136 if (pp->p_fsize) { 137 long bsize; 138 139 if (cgetnum(buf, pbsize, &bsize) == 0) 140 pp->p_frag = bsize / pp->p_fsize; 141 else 142 pp->p_frag = 8; 143 } 144 getnumdflt(pp->p_fstype, ptype, 0); 145 if (pp->p_fstype == 0) 146 if (cgetstr(buf, ptype, &cq) >= 0) { 147 pp->p_fstype = gettype(cq, fstypenames); 148 free(cq); 149 } 150 max = p; 151 } 152 } 153 dp->d_npartitions = max + 1 - 'a'; 154 (void)strcpy(psize, "dx"); 155 dx = dp->d_drivedata; 156 for (p = '0'; p < '0' + NDDATA; p++, dx++) { 157 psize[1] = p; 158 getnumdflt(*dx, psize, 0); 159 } 160 dp->d_magic = DISKMAGIC; 161 dp->d_magic2 = DISKMAGIC; 162 free(buf); 163 return (dp); 164 } 165