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 sccsid[] = "@(#)disklabel.c 8.2 (Berkeley) 5/3/95"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #define DKTYPENAMES 42 #include <sys/disklabel.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 51 static int 52 gettype(char *t, const char **names) 53 { 54 const char **nm; 55 56 for (nm = names; *nm; nm++) 57 if (strcasecmp(t, *nm) == 0) 58 return (nm - names); 59 if (isdigit((unsigned char)*t)) 60 return (atoi(t)); 61 return (0); 62 } 63 64 struct disklabel * 65 getdiskbyname(const char *name) 66 { 67 static struct disklabel disk; 68 struct disklabel *dp = &disk; 69 struct partition *pp; 70 char *buf; 71 char *db_array[2] = { _PATH_DISKTAB, 0 }; 72 char *cp, *cq; /* can't be register */ 73 char p, max, psize[3], pbsize[3], 74 pfsize[3], poffset[3], ptype[3]; 75 u_int32_t *dx; 76 77 if (cgetent(&buf, db_array, (char *) name) < 0) 78 return NULL; 79 80 bzero((char *)&disk, sizeof(disk)); 81 /* 82 * typename 83 */ 84 cq = dp->d_typename; 85 cp = buf; 86 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 && 87 (*cq = *cp) && *cq != '|' && *cq != ':') 88 cq++, cp++; 89 *cq = '\0'; 90 91 if (cgetstr(buf, "ty", &cq) > 0 && strcmp(cq, "removable") == 0) 92 dp->d_flags |= D_REMOVABLE; 93 else if (cq && strcmp(cq, "simulated") == 0) 94 dp->d_flags |= D_RAMDISK; 95 if (cgetcap(buf, "sf", ':') != NULL) 96 dp->d_flags |= D_BADSECT; 97 98 #define getnumdflt(field, dname, dflt) \ 99 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; } 100 101 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 102 getnumdflt(dp->d_ntracks, "nt", 0); 103 getnumdflt(dp->d_nsectors, "ns", 0); 104 getnumdflt(dp->d_ncylinders, "nc", 0); 105 106 if (cgetstr(buf, "dt", &cq) > 0) 107 dp->d_type = gettype(cq, dktypenames); 108 else 109 getnumdflt(dp->d_type, "dt", 0); 110 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 111 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 112 getnumdflt(dp->d_rpm, "rm", 3600); 113 getnumdflt(dp->d_interleave, "il", 1); 114 getnumdflt(dp->d_trackskew, "sk", 0); 115 getnumdflt(dp->d_cylskew, "cs", 0); 116 getnumdflt(dp->d_headswitch, "hs", 0); 117 getnumdflt(dp->d_trkseek, "ts", 0); 118 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 119 getnumdflt(dp->d_sbsize, "sb", 0); 120 strcpy(psize, "px"); 121 strcpy(pbsize, "bx"); 122 strcpy(pfsize, "fx"); 123 strcpy(poffset, "ox"); 124 strcpy(ptype, "tx"); 125 max = 'a' - 1; 126 pp = &dp->d_partitions[0]; 127 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { 128 long l; 129 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 130 if (cgetnum(buf, psize, &l) == -1) 131 pp->p_size = 0; 132 else { 133 pp->p_size = l; 134 cgetnum(buf, poffset, &l); 135 pp->p_offset = l; 136 getnumdflt(pp->p_fsize, pfsize, 0); 137 if (pp->p_fsize) { 138 long bsize; 139 140 if (cgetnum(buf, pbsize, &bsize) == 0) 141 pp->p_frag = bsize / pp->p_fsize; 142 else 143 pp->p_frag = 8; 144 } 145 getnumdflt(pp->p_fstype, ptype, 0); 146 if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0) 147 pp->p_fstype = gettype(cq, fstypenames); 148 max = p; 149 } 150 } 151 dp->d_npartitions = max + 1 - 'a'; 152 (void)strcpy(psize, "dx"); 153 dx = dp->d_drivedata; 154 for (p = '0'; p < '0' + NDDATA; p++, dx++) { 155 psize[1] = p; 156 getnumdflt(*dx, psize, 0); 157 } 158 dp->d_magic = DISKMAGIC; 159 dp->d_magic2 = DISKMAGIC; 160 free(buf); 161 return (dp); 162 } 163