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29 * @(#)disklabel.c 8.2 (Berkeley) 5/3/95
30 * $FreeBSD: src/lib/libc/gen/disklabel.c,v 1.9.2.1 2001/03/05 08:40:47 obrien Exp $
31 * $DragonFly: src/lib/libc/gen/disklabel.c,v 1.13 2007/06/18 05:13:34 dillon Exp $
34 #include <sys/param.h>
36 #include <sys/disklabel32.h>
37 #include <sys/dtype.h>
38 #include <vfs/ufs/dinode.h>
39 #include <vfs/ufs/fs.h>
49 static int gettype (const char *, const char **);
52 getdiskbyname(const char *name)
54 static struct disklabel32 disk;
55 struct disklabel32 *dp = &disk;
56 struct partition32 *pp;
58 char *db_array[2] = { _PATH_DISKTAB, 0 };
59 char *cp, *cq; /* can't be register */
60 char p, max, psize[3], pbsize[3],
61 pfsize[3], poffset[3], ptype[3];
64 if (cgetent(&buf, db_array, (char *)name) < 0)
67 bzero((char *)&disk, sizeof(disk));
73 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 &&
74 (*cq = *cp) && *cq != '|' && *cq != ':')
78 #define getnumdflt(field, dname, dflt) \
79 { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; }
81 getnumdflt(dp->d_secsize, "se", DEV_BSIZE);
82 getnumdflt(dp->d_ntracks, "nt", 0);
83 getnumdflt(dp->d_nsectors, "ns", 0);
84 getnumdflt(dp->d_ncylinders, "nc", 0);
86 if (cgetstr(buf, "dt", &cq) > 0)
87 dp->d_type = gettype(cq, dktypenames);
89 getnumdflt(dp->d_type, "dt", 0);
90 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks);
91 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders);
92 getnumdflt(dp->d_rpm, "rm", 3600);
93 getnumdflt(dp->d_interleave, "il", 1);
94 getnumdflt(dp->d_trackskew, "sk", 0);
95 getnumdflt(dp->d_cylskew, "cs", 0);
96 getnumdflt(dp->d_headswitch, "hs", 0);
97 getnumdflt(dp->d_trkseek, "ts", 0);
98 getnumdflt(dp->d_bbsize, "bs", BBSIZE);
99 getnumdflt(dp->d_sbsize, "sb", SBSIZE);
101 strcpy(pbsize, "bx");
102 strcpy(pfsize, "fx");
103 strcpy(poffset, "ox");
106 pp = &dp->d_partitions[0];
107 for (p = 'a'; p < 'a' + MAXPARTITIONS32; p++, pp++) {
109 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p;
110 if (cgetnum(buf, psize, &l) == -1)
114 cgetnum(buf, poffset, &l);
116 getnumdflt(pp->p_fsize, pfsize, 0);
120 if (cgetnum(buf, pbsize, &bsize) == 0)
121 pp->p_frag = bsize / pp->p_fsize;
125 getnumdflt(pp->p_fstype, ptype, 0);
126 if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0)
127 pp->p_fstype = gettype(cq, fstypenames);
131 dp->d_npartitions = max + 1 - 'a';
133 dx = dp->d_drivedata;
134 for (p = '0'; p < '0' + NDDATA32; p++, dx++) {
136 getnumdflt(*dx, psize, 0);
138 dp->d_magic = DISKMAGIC32;
139 dp->d_magic2 = DISKMAGIC32;
145 gettype(const char *t, const char **names)
149 for (nm = names; *nm; nm++)
150 if (strcasecmp(t, *nm) == 0)
152 if (isdigit((unsigned char)*t))