disklabel.c revision 39684 
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#ifndef lint
35#if 0
36static char sccsid[] = "@(#)disklabel.c	8.2 (Berkeley) 5/3/95";
37#endif
38static const char rcsid[] =
39	"$Id: disklabel.c,v 1.6 1997/03/11 11:52:25 peter Exp $";
40#endif /* not lint */
41
42#include <sys/param.h>
43#define DKTYPENAMES
44#include <sys/disklabel.h>
45#include <ufs/ufs/dinode.h>
46#include <ufs/ffs/fs.h>
47
48#include <errno.h>
49#include <fcntl.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54#include <ctype.h>
55
56static int	gettype __P((char *, char **));
57
58struct disklabel *
59getdiskbyname(name)
60	const char *name;
61{
62	static struct	disklabel disk;
63	register struct	disklabel *dp = &disk;
64	register struct partition *pp;
65	char	*buf;
66	char  	*db_array[2] = { _PATH_DISKTAB, 0 };
67	char	*cp, *cq;	/* can't be register */
68	char	p, max, psize[3], pbsize[3],
69		pfsize[3], poffset[3], ptype[3];
70	u_int32_t *dx;
71
72	if (cgetent(&buf, db_array, (char *) name) < 0)
73		return NULL;
74
75	bzero((char *)&disk, sizeof(disk));
76	/*
77	 * typename
78	 */
79	cq = dp->d_typename;
80	cp = buf;
81	while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 &&
82	    (*cq = *cp) && *cq != '|' && *cq != ':')
83		cq++, cp++;
84	*cq = '\0';
85	/*
86	 * boot name (optional)  xxboot, bootxx
87	 */
88	cgetstr(buf, "b0", &dp->d_boot0);
89	cgetstr(buf, "b1", &dp->d_boot1);
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", SBSIZE);
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
164static int
165gettype(t, names)
166	char *t;
167	char **names;
168{
169	register char **nm;
170
171	for (nm = names; *nm; nm++)
172		if (strcasecmp(t, *nm) == 0)
173			return (nm - names);
174	if (isdigit(*t))
175		return (atoi(t));
176	return (0);
177}
178