1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __SCCSID("@(#)disklabel.c 8.2 (Berkeley) 5/3/95");
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/param.h>
37 #define DKTYPENAMES
38 #define FSTYPENAMES
39 #include <sys/disklabel.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
48 static int
gettype(char * t,const char ** names)49 gettype(char *t, const char **names)
50 {
51 const char **nm;
52
53 for (nm = names; *nm; nm++)
54 if (strcasecmp(t, *nm) == 0)
55 return (nm - names);
56 if (isdigit((unsigned char)*t))
57 return (atoi(t));
58 return (0);
59 }
60
61 struct disklabel *
getdiskbyname(const char * name)62 getdiskbyname(const char *name)
63 {
64 static struct disklabel disk;
65 struct disklabel *dp = &disk;
66 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 if (cgetstr(buf, "ty", &cq) > 0) {
89 if (strcmp(cq, "removable") == 0)
90 dp->d_flags |= D_REMOVABLE;
91 else if (cq && strcmp(cq, "simulated") == 0)
92 dp->d_flags |= D_RAMDISK;
93 free(cq);
94 }
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 free(cq);
109 } else
110 getnumdflt(dp->d_type, "dt", 0);
111 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks);
112 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders);
113 getnumdflt(dp->d_rpm, "rm", 3600);
114 getnumdflt(dp->d_interleave, "il", 1);
115 getnumdflt(dp->d_trackskew, "sk", 0);
116 getnumdflt(dp->d_cylskew, "cs", 0);
117 getnumdflt(dp->d_headswitch, "hs", 0);
118 getnumdflt(dp->d_trkseek, "ts", 0);
119 getnumdflt(dp->d_bbsize, "bs", BBSIZE);
120 getnumdflt(dp->d_sbsize, "sb", 0);
121 strcpy(psize, "px");
122 strcpy(pbsize, "bx");
123 strcpy(pfsize, "fx");
124 strcpy(poffset, "ox");
125 strcpy(ptype, "tx");
126 max = 'a' - 1;
127 pp = &dp->d_partitions[0];
128 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) {
129 long l;
130 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p;
131 if (cgetnum(buf, psize, &l) == -1)
132 pp->p_size = 0;
133 else {
134 pp->p_size = l;
135 cgetnum(buf, poffset, &l);
136 pp->p_offset = l;
137 getnumdflt(pp->p_fsize, pfsize, 0);
138 if (pp->p_fsize) {
139 long bsize;
140
141 if (cgetnum(buf, pbsize, &bsize) == 0)
142 pp->p_frag = bsize / pp->p_fsize;
143 else
144 pp->p_frag = 8;
145 }
146 getnumdflt(pp->p_fstype, ptype, 0);
147 if (pp->p_fstype == 0)
148 if (cgetstr(buf, ptype, &cq) >= 0) {
149 pp->p_fstype = gettype(cq, fstypenames);
150 free(cq);
151 }
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