1 /*
2 * Copyright (c) 1983, 1987, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char sccsid[] = "@(#)disklabel.c 8.2 (Berkeley) 05/03/95";
10 #endif /* not lint */
11
12 #include <sys/param.h>
13 #define DKTYPENAMES
14 #include <sys/disklabel.h>
15 #include <ufs/ufs/dinode.h>
16 #include <ufs/ffs/fs.h>
17
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <unistd.h>
24
25 static int error __P((int));
26 static int gettype __P((char *, char **));
27
28 struct disklabel *
getdiskbyname(name)29 getdiskbyname(name)
30 const char *name;
31 {
32 static struct disklabel disk;
33 register struct disklabel *dp = &disk;
34 register struct partition *pp;
35 char *buf;
36 char *db_array[2] = { _PATH_DISKTAB, 0 };
37 char *cp, *cq; /* can't be register */
38 char p, max, psize[3], pbsize[3],
39 pfsize[3], poffset[3], ptype[3];
40 u_int32_t *dx;
41
42 if (cgetent(&buf, db_array, (char *) name) < 0)
43 return NULL;
44
45 bzero((char *)&disk, sizeof(disk));
46 /*
47 * typename
48 */
49 cq = dp->d_typename;
50 cp = buf;
51 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 &&
52 (*cq = *cp) && *cq != '|' && *cq != ':')
53 cq++, cp++;
54 *cq = '\0';
55 /*
56 * boot name (optional) xxboot, bootxx
57 */
58 cgetstr(buf, "b0", &dp->d_boot0);
59 cgetstr(buf, "b1", &dp->d_boot1);
60
61 if (cgetstr(buf, "ty", &cq) > 0 && strcmp(cq, "removable") == 0)
62 dp->d_flags |= D_REMOVABLE;
63 else if (cq && strcmp(cq, "simulated") == 0)
64 dp->d_flags |= D_RAMDISK;
65 if (cgetcap(buf, "sf", ':') != NULL)
66 dp->d_flags |= D_BADSECT;
67
68 #define getnumdflt(field, dname, dflt) \
69 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; }
70
71 getnumdflt(dp->d_secsize, "se", DEV_BSIZE);
72 cgetnum(buf, "nt",(long *) &dp->d_ntracks);
73 cgetnum(buf, "ns",(long *) &dp->d_nsectors);
74 cgetnum(buf, "nc",(long *) &dp->d_ncylinders);
75
76 if (cgetstr(buf, "dt", &cq) > 0)
77 dp->d_type = gettype(cq, dktypenames);
78 else
79 getnumdflt(dp->d_type, "dt", 0);
80 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks);
81 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders);
82 getnumdflt(dp->d_rpm, "rm", 3600);
83 getnumdflt(dp->d_interleave, "il", 1);
84 getnumdflt(dp->d_trackskew, "sk", 0);
85 getnumdflt(dp->d_cylskew, "cs", 0);
86 getnumdflt(dp->d_headswitch, "hs", 0);
87 getnumdflt(dp->d_trkseek, "ts", 0);
88 getnumdflt(dp->d_bbsize, "bs", BBSIZE);
89 getnumdflt(dp->d_sbsize, "sb", SBSIZE);
90 strcpy(psize, "px");
91 strcpy(pbsize, "bx");
92 strcpy(pfsize, "fx");
93 strcpy(poffset, "ox");
94 strcpy(ptype, "tx");
95 max = 'a' - 1;
96 pp = &dp->d_partitions[0];
97 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) {
98 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p;
99 if (cgetnum(buf, psize,(long *) &pp->p_size) == -1)
100 pp->p_size = 0;
101 else {
102 cgetnum(buf, poffset, (long *) &pp->p_offset);
103 getnumdflt(pp->p_fsize, pfsize, 0);
104 if (pp->p_fsize) {
105 long bsize;
106
107 if (cgetnum(buf, pbsize, &bsize) == 0)
108 pp->p_frag = bsize / pp->p_fsize;
109 else
110 pp->p_frag = 8;
111 }
112 getnumdflt(pp->p_fstype, ptype, 0);
113 if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0)
114 pp->p_fstype = gettype(cq, fstypenames);
115 max = p;
116 }
117 }
118 dp->d_npartitions = max + 1 - 'a';
119 (void)strcpy(psize, "dx");
120 dx = dp->d_drivedata;
121 for (p = '0'; p < '0' + NDDATA; p++, dx++) {
122 psize[1] = p;
123 getnumdflt(*dx, psize, 0);
124 }
125 dp->d_magic = DISKMAGIC;
126 dp->d_magic2 = DISKMAGIC;
127 free(buf);
128 return (dp);
129 }
130
131 static int
gettype(t,names)132 gettype(t, names)
133 char *t;
134 char **names;
135 {
136 register char **nm;
137
138 for (nm = names; *nm; nm++)
139 if (strcasecmp(t, *nm) == 0)
140 return (nm - names);
141 if (isdigit(*t))
142 return (atoi(t));
143 return (0);
144 }
145
146 static int
error(err)147 error(err)
148 int err;
149 {
150 char *p;
151
152 (void)write(STDERR_FILENO, "disktab: ", 9);
153 (void)write(STDERR_FILENO, _PATH_DISKTAB, sizeof(_PATH_DISKTAB) - 1);
154 (void)write(STDERR_FILENO, ": ", 2);
155 p = strerror(err);
156 (void)write(STDERR_FILENO, p, strlen(p));
157 (void)write(STDERR_FILENO, "\n", 1);
158 }
159