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/param.h>
33 #define DKTYPENAMES
34 #define FSTYPENAMES
35 #include <sys/disklabel.h>
36
37 #include <fcntl.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42 #include <ctype.h>
43
44 static int
gettype(char * t,const char ** names)45 gettype(char *t, const char **names)
46 {
47 const char **nm;
48
49 for (nm = names; *nm; nm++)
50 if (strcasecmp(t, *nm) == 0)
51 return (nm - names);
52 if (isdigit((unsigned char)*t))
53 return (atoi(t));
54 return (0);
55 }
56
57 struct disklabel *
getdiskbyname(const char * name)58 getdiskbyname(const char *name)
59 {
60 static struct disklabel disk;
61 struct disklabel *dp = &disk;
62 struct partition *pp;
63 char *buf;
64 char *db_array[2] = { _PATH_DISKTAB, 0 };
65 char *cp, *cq; /* can't be register */
66 char p, max, psize[3], pbsize[3],
67 pfsize[3], poffset[3], ptype[3];
68 u_int32_t *dx;
69
70 if (cgetent(&buf, db_array, (char *) name) < 0)
71 return NULL;
72
73 bzero((char *)&disk, sizeof(disk));
74 /*
75 * typename
76 */
77 cq = dp->d_typename;
78 cp = buf;
79 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 &&
80 (*cq = *cp) && *cq != '|' && *cq != ':')
81 cq++, cp++;
82 *cq = '\0';
83
84 if (cgetstr(buf, "ty", &cq) > 0) {
85 if (strcmp(cq, "removable") == 0)
86 dp->d_flags |= D_REMOVABLE;
87 else if (cq && strcmp(cq, "simulated") == 0)
88 dp->d_flags |= D_RAMDISK;
89 free(cq);
90 }
91 if (cgetcap(buf, "sf", ':') != NULL)
92 dp->d_flags |= D_BADSECT;
93
94 #define getnumdflt(field, dname, dflt) \
95 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; }
96
97 getnumdflt(dp->d_secsize, "se", DEV_BSIZE);
98 getnumdflt(dp->d_ntracks, "nt", 0);
99 getnumdflt(dp->d_nsectors, "ns", 0);
100 getnumdflt(dp->d_ncylinders, "nc", 0);
101
102 if (cgetstr(buf, "dt", &cq) > 0) {
103 dp->d_type = gettype(cq, dktypenames);
104 free(cq);
105 } else
106 getnumdflt(dp->d_type, "dt", 0);
107 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks);
108 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders);
109 getnumdflt(dp->d_rpm, "rm", 3600);
110 getnumdflt(dp->d_interleave, "il", 1);
111 getnumdflt(dp->d_trackskew, "sk", 0);
112 getnumdflt(dp->d_cylskew, "cs", 0);
113 getnumdflt(dp->d_headswitch, "hs", 0);
114 getnumdflt(dp->d_trkseek, "ts", 0);
115 getnumdflt(dp->d_bbsize, "bs", BBSIZE);
116 getnumdflt(dp->d_sbsize, "sb", 0);
117 strcpy(psize, "px");
118 strcpy(pbsize, "bx");
119 strcpy(pfsize, "fx");
120 strcpy(poffset, "ox");
121 strcpy(ptype, "tx");
122 max = 'a' - 1;
123 pp = &dp->d_partitions[0];
124 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) {
125 long l;
126 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p;
127 if (cgetnum(buf, psize, &l) == -1)
128 pp->p_size = 0;
129 else {
130 pp->p_size = l;
131 cgetnum(buf, poffset, &l);
132 pp->p_offset = l;
133 getnumdflt(pp->p_fsize, pfsize, 0);
134 if (pp->p_fsize) {
135 long bsize;
136
137 if (cgetnum(buf, pbsize, &bsize) == 0)
138 pp->p_frag = bsize / pp->p_fsize;
139 else
140 pp->p_frag = 8;
141 }
142 getnumdflt(pp->p_fstype, ptype, 0);
143 if (pp->p_fstype == 0)
144 if (cgetstr(buf, ptype, &cq) >= 0) {
145 pp->p_fstype = gettype(cq, fstypenames);
146 free(cq);
147 }
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