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 * @(#)disklabel.c 8.2 (Berkeley) 5/3/95 34 * $FreeBSD: src/lib/libc/gen/disklabel.c,v 1.9.2.1 2001/03/05 08:40:47 obrien Exp $ 35 * $DragonFly: src/lib/libc/gen/disklabel.c,v 1.11 2007/05/19 00:51:56 dillon Exp $ 36 */ 37 38 #include <sys/param.h> 39 #define DKTYPENAMES 40 #include <sys/disklabel.h> 41 #include <vfs/ufs/dinode.h> 42 #include <vfs/ufs/fs.h> 43 44 #include <fcntl.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 #include <ctype.h> 50 #include <disktab.h> 51 52 static int gettype (const char *, const char **); 53 54 struct disklabel * 55 getdiskbyname(const char *name) 56 { 57 static struct disklabel disk; 58 struct disklabel *dp = &disk; 59 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 #define getnumdflt(field, dname, dflt) \ 82 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; } 83 84 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 85 getnumdflt(dp->d_ntracks, "nt", 0); 86 getnumdflt(dp->d_nsectors, "ns", 0); 87 getnumdflt(dp->d_ncylinders, "nc", 0); 88 89 if (cgetstr(buf, "dt", &cq) > 0) 90 dp->d_type = gettype(cq, dktypenames); 91 else 92 getnumdflt(dp->d_type, "dt", 0); 93 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 94 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 95 getnumdflt(dp->d_rpm, "rm", 3600); 96 getnumdflt(dp->d_interleave, "il", 1); 97 getnumdflt(dp->d_trackskew, "sk", 0); 98 getnumdflt(dp->d_cylskew, "cs", 0); 99 getnumdflt(dp->d_headswitch, "hs", 0); 100 getnumdflt(dp->d_trkseek, "ts", 0); 101 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 102 getnumdflt(dp->d_sbsize, "sb", SBSIZE); 103 strcpy(psize, "px"); 104 strcpy(pbsize, "bx"); 105 strcpy(pfsize, "fx"); 106 strcpy(poffset, "ox"); 107 strcpy(ptype, "tx"); 108 max = 'a' - 1; 109 pp = &dp->d_partitions[0]; 110 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { 111 long l; 112 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 113 if (cgetnum(buf, psize, &l) == -1) 114 pp->p_size = 0; 115 else { 116 pp->p_size = l; 117 cgetnum(buf, poffset, &l); 118 pp->p_offset = l; 119 getnumdflt(pp->p_fsize, pfsize, 0); 120 if (pp->p_fsize) { 121 long bsize; 122 123 if (cgetnum(buf, pbsize, &bsize) == 0) 124 pp->p_frag = bsize / pp->p_fsize; 125 else 126 pp->p_frag = 8; 127 } 128 getnumdflt(pp->p_fstype, ptype, 0); 129 if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0) 130 pp->p_fstype = gettype(cq, fstypenames); 131 max = p; 132 } 133 } 134 dp->d_npartitions = max + 1 - 'a'; 135 strcpy(psize, "dx"); 136 dx = dp->d_drivedata; 137 for (p = '0'; p < '0' + NDDATA; p++, dx++) { 138 psize[1] = p; 139 getnumdflt(*dx, psize, 0); 140 } 141 dp->d_magic = DISKMAGIC; 142 dp->d_magic2 = DISKMAGIC; 143 free(buf); 144 return (dp); 145 } 146 147 static int 148 gettype(const char *t, const char **names) 149 { 150 const char **nm; 151 152 for (nm = names; *nm; nm++) 153 if (strcasecmp(t, *nm) == 0) 154 return (nm - names); 155 if (isdigit((unsigned char)*t)) 156 return (atoi(t)); 157 return (0); 158 } 159