1 /* $NetBSD: disklabel.c,v 1.11 1995/06/07 13:14:09 cgd Exp $ */ 2 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)disklabel.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 static char rcsid[] = "$NetBSD: disklabel.c,v 1.11 1995/06/07 13:14:09 cgd Exp $"; 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include <sys/param.h> 45 #define DKTYPENAMES 46 #include <sys/disklabel.h> 47 #include <ufs/ffs/fs.h> 48 49 #include <ctype.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 static void error __P((int)); 58 static int gettype __P((char *, char **)); 59 60 struct disklabel * 61 getdiskbyname(name) 62 const char *name; 63 { 64 static struct disklabel disk; 65 register struct disklabel *dp = &disk; 66 register 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 * boot name (optional) xxboot, bootxx 89 */ 90 cgetstr(buf, "b0", &dp->d_boot0); 91 cgetstr(buf, "b1", &dp->d_boot1); 92 93 if (cgetstr(buf, "ty", &cq) > 0 && strcmp(cq, "removable") == 0) 94 dp->d_flags |= D_REMOVABLE; 95 else if (cq && strcmp(cq, "simulated") == 0) 96 dp->d_flags |= D_RAMDISK; 97 if (cgetcap(buf, "sf", ':') != NULL) 98 dp->d_flags |= D_BADSECT; 99 100 #define getnumdflt(field, dname, dflt) \ 101 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; } 102 #define getnum(field, dname) \ 103 { long f; cgetnum(buf, dname, &f); field = f; } 104 105 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 106 getnum(dp->d_ntracks, "nt"); 107 getnum(dp->d_nsectors, "ns"); 108 getnum(dp->d_ncylinders, "nc"); 109 110 if (cgetstr(buf, "dt", &cq) > 0) 111 dp->d_type = gettype(cq, dktypenames); 112 else 113 getnumdflt(dp->d_type, "dt", 0); 114 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 115 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 116 getnumdflt(dp->d_rpm, "rm", 3600); 117 getnumdflt(dp->d_interleave, "il", 1); 118 getnumdflt(dp->d_trackskew, "sk", 0); 119 getnumdflt(dp->d_cylskew, "cs", 0); 120 getnumdflt(dp->d_headswitch, "hs", 0); 121 getnumdflt(dp->d_trkseek, "ts", 0); 122 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 123 getnumdflt(dp->d_sbsize, "sb", SBSIZE); 124 strcpy(psize, "px"); 125 strcpy(pbsize, "bx"); 126 strcpy(pfsize, "fx"); 127 strcpy(poffset, "ox"); 128 strcpy(ptype, "tx"); 129 max = 'a' - 1; 130 pp = &dp->d_partitions[0]; 131 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { 132 long f; 133 134 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 135 if (cgetnum(buf, psize, &f) == -1) 136 pp->p_size = 0; 137 else { 138 pp->p_size = f; 139 getnum(pp->p_offset, poffset); 140 getnumdflt(pp->p_fsize, pfsize, 0); 141 if (pp->p_fsize) { 142 long bsize; 143 144 if (cgetnum(buf, pbsize, &bsize) == 0) 145 pp->p_frag = bsize / pp->p_fsize; 146 else 147 pp->p_frag = 8; 148 } 149 getnumdflt(pp->p_fstype, ptype, 0); 150 if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0) 151 pp->p_fstype = gettype(cq, fstypenames); 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 } 167 168 static int 169 gettype(t, names) 170 char *t; 171 char **names; 172 { 173 register char **nm; 174 175 for (nm = names; *nm; nm++) 176 if (strcasecmp(t, *nm) == 0) 177 return (nm - names); 178 if (isdigit(*t)) 179 return (atoi(t)); 180 return (0); 181 } 182 183 static void 184 error(err) 185 int err; 186 { 187 char *p; 188 189 (void)write(STDERR_FILENO, "disktab: ", 9); 190 (void)write(STDERR_FILENO, _PATH_DISKTAB, sizeof(_PATH_DISKTAB) - 1); 191 (void)write(STDERR_FILENO, ": ", 2); 192 p = strerror(err); 193 (void)write(STDERR_FILENO, p, strlen(p)); 194 (void)write(STDERR_FILENO, "\n", 1); 195 } 196