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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)disklabel.c 8.2 (Berkeley) 5/3/95 30 * $FreeBSD: src/lib/libc/gen/disklabel.c,v 1.9.2.1 2001/03/05 08:40:47 obrien Exp $ 31 * $DragonFly: src/lib/libc/gen/disklabel.c,v 1.13 2007/06/18 05:13:34 dillon Exp $ 32 */ 33 34 #include <sys/param.h> 35 #define DKTYPENAMES 36 #include <sys/disklabel32.h> 37 #include <sys/dtype.h> 38 #include <vfs/ufs/dinode.h> 39 #include <vfs/ufs/fs.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 #include <disktab.h> 48 49 static int gettype (const char *, const char **); 50 51 struct disklabel32 * 52 getdiskbyname(const char *name) 53 { 54 static struct disklabel32 disk; 55 struct disklabel32 *dp = &disk; 56 struct partition32 *pp; 57 char *buf; 58 char *db_array[2] = { _PATH_DISKTAB, 0 }; 59 char *cp, *cq; /* can't be register */ 60 char p, max, psize[3], pbsize[3], 61 pfsize[3], poffset[3], ptype[3]; 62 u_int32_t *dx; 63 64 if (cgetent(&buf, db_array, (char *)name) < 0) 65 return NULL; 66 67 bzero((char *)&disk, sizeof(disk)); 68 /* 69 * typename 70 */ 71 cq = dp->d_typename; 72 cp = buf; 73 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 && 74 (*cq = *cp) && *cq != '|' && *cq != ':') 75 cq++, cp++; 76 *cq = '\0'; 77 78 #define getnumdflt(field, dname, dflt) \ 79 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; } 80 81 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 82 getnumdflt(dp->d_ntracks, "nt", 0); 83 getnumdflt(dp->d_nsectors, "ns", 0); 84 getnumdflt(dp->d_ncylinders, "nc", 0); 85 86 if (cgetstr(buf, "dt", &cq) > 0) 87 dp->d_type = gettype(cq, dktypenames); 88 else 89 getnumdflt(dp->d_type, "dt", 0); 90 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 91 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 92 getnumdflt(dp->d_rpm, "rm", 3600); 93 getnumdflt(dp->d_interleave, "il", 1); 94 getnumdflt(dp->d_trackskew, "sk", 0); 95 getnumdflt(dp->d_cylskew, "cs", 0); 96 getnumdflt(dp->d_headswitch, "hs", 0); 97 getnumdflt(dp->d_trkseek, "ts", 0); 98 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 99 getnumdflt(dp->d_sbsize, "sb", SBSIZE); 100 strcpy(psize, "px"); 101 strcpy(pbsize, "bx"); 102 strcpy(pfsize, "fx"); 103 strcpy(poffset, "ox"); 104 strcpy(ptype, "tx"); 105 max = 'a' - 1; 106 pp = &dp->d_partitions[0]; 107 for (p = 'a'; p < 'a' + MAXPARTITIONS32; p++, pp++) { 108 long l; 109 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 110 if (cgetnum(buf, psize, &l) == -1) 111 pp->p_size = 0; 112 else { 113 pp->p_size = l; 114 cgetnum(buf, poffset, &l); 115 pp->p_offset = l; 116 getnumdflt(pp->p_fsize, pfsize, 0); 117 if (pp->p_fsize) { 118 long bsize; 119 120 if (cgetnum(buf, pbsize, &bsize) == 0) 121 pp->p_frag = bsize / pp->p_fsize; 122 else 123 pp->p_frag = 8; 124 } 125 getnumdflt(pp->p_fstype, ptype, 0); 126 if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0) 127 pp->p_fstype = gettype(cq, fstypenames); 128 max = p; 129 } 130 } 131 dp->d_npartitions = max + 1 - 'a'; 132 strcpy(psize, "dx"); 133 dx = dp->d_drivedata; 134 for (p = '0'; p < '0' + NDDATA32; p++, dx++) { 135 psize[1] = p; 136 getnumdflt(*dx, psize, 0); 137 } 138 dp->d_magic = DISKMAGIC32; 139 dp->d_magic2 = DISKMAGIC32; 140 free(buf); 141 return (dp); 142 } 143 144 static int 145 gettype(const char *t, const char **names) 146 { 147 const char **nm; 148 149 for (nm = names; *nm; nm++) 150 if (strcasecmp(t, *nm) == 0) 151 return (nm - names); 152 if (isdigit((unsigned char)*t)) 153 return (atoi(t)); 154 return (0); 155 } 156