1 /* 2 * Copyright (c) 1983, 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char rcsid[] = "$OpenBSD: disklabel.c,v 1.5 2000/07/19 15:25:13 deraadt Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/param.h> 39 #define DKTYPENAMES 40 #include <sys/disklabel.h> 41 #include <ufs/ffs/fs.h> 42 43 #include <ctype.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 static int gettype __P((char *, char **)); 52 53 struct disklabel * 54 getdiskbyname(name) 55 const char *name; 56 { 57 static struct disklabel disk; 58 register struct disklabel *dp = &disk; 59 register struct partition *pp; 60 char *buf; 61 char *db_array[2] = { _PATH_DISKTAB, 0 }; 62 char *cp, *cq; /* can't be register */ 63 char p, max, psize[3], pbsize[3], 64 pfsize[3], poffset[3], ptype[3]; 65 u_int32_t *dx; 66 67 if (cgetent(&buf, db_array, (char *) name) < 0) 68 return NULL; 69 70 bzero((char *)&disk, sizeof(disk)); 71 /* 72 * typename 73 */ 74 cq = dp->d_typename; 75 cp = buf; 76 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 && 77 (*cq = *cp) && *cq != '|' && *cq != ':') 78 cq++, cp++; 79 *cq = '\0'; 80 /* 81 * boot name (optional) xxboot, bootxx 82 */ 83 cgetstr(buf, "b0", &dp->d_boot0); 84 cgetstr(buf, "b1", &dp->d_boot1); 85 86 if (cgetstr(buf, "ty", &cq) > 0 && strcmp(cq, "removable") == 0) 87 dp->d_flags |= D_REMOVABLE; 88 else if (cq && strcmp(cq, "simulated") == 0) 89 dp->d_flags |= D_RAMDISK; 90 if (cgetcap(buf, "sf", ':') != NULL) 91 dp->d_flags |= D_BADSECT; 92 93 #define getnumdflt(field, dname, dflt) \ 94 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; } 95 #define getnum(field, dname) \ 96 { long f; cgetnum(buf, dname, &f); field = f; } 97 98 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 99 getnum(dp->d_ntracks, "nt"); 100 getnum(dp->d_nsectors, "ns"); 101 getnum(dp->d_ncylinders, "nc"); 102 103 if (cgetstr(buf, "dt", &cq) > 0) 104 dp->d_type = gettype(cq, dktypenames); 105 else 106 getnumdflt(dp->d_type, "dt", 0); 107 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 108 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 109 getnumdflt(dp->d_rpm, "rm", 3600); 110 getnumdflt(dp->d_interleave, "il", 1); 111 getnumdflt(dp->d_trackskew, "sk", 0); 112 getnumdflt(dp->d_cylskew, "cs", 0); 113 getnumdflt(dp->d_headswitch, "hs", 0); 114 getnumdflt(dp->d_trkseek, "ts", 0); 115 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 116 getnumdflt(dp->d_sbsize, "sb", SBSIZE); 117 strcpy(psize, "px"); 118 strcpy(pbsize, "bx"); 119 strcpy(pfsize, "fx"); 120 strcpy(poffset, "ox"); 121 strcpy(ptype, "tx"); 122 max = 'a' - 1; 123 pp = &dp->d_partitions[0]; 124 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { 125 long f; 126 127 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 128 if (cgetnum(buf, psize, &f) == -1) 129 pp->p_size = 0; 130 else { 131 pp->p_size = f; 132 getnum(pp->p_offset, poffset); 133 getnumdflt(pp->p_fsize, pfsize, 0); 134 if (pp->p_fsize) { 135 long bsize; 136 137 if (cgetnum(buf, pbsize, &bsize) == 0) 138 pp->p_frag = bsize / pp->p_fsize; 139 else 140 pp->p_frag = 8; 141 } 142 getnumdflt(pp->p_fstype, ptype, 0); 143 if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0) 144 pp->p_fstype = gettype(cq, fstypenames); 145 max = p; 146 } 147 } 148 dp->d_npartitions = max + 1 - 'a'; 149 (void)strcpy(psize, "dx"); 150 dx = dp->d_drivedata; 151 for (p = '0'; p < '0' + NDDATA; p++, dx++) { 152 psize[1] = p; 153 getnumdflt(*dx, psize, 0); 154 } 155 dp->d_magic = DISKMAGIC; 156 dp->d_magic2 = DISKMAGIC; 157 free(buf); 158 return (dp); 159 } 160 161 static int 162 gettype(t, names) 163 char *t; 164 char **names; 165 { 166 register char **nm; 167 168 for (nm = names; *nm; nm++) 169 if (strcasecmp(t, *nm) == 0) 170 return (nm - names); 171 if (isdigit((u_char)*t)) 172 return (atoi(t)); 173 return (0); 174 } 175