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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)disklabel.c	8.2 (Berkeley) 5/3/95";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
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
48static int
49gettype(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
61struct disklabel *
62getdiskbyname(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 && strcmp(cq, "removable") == 0)
89		dp->d_flags |= D_REMOVABLE;
90	else  if (cq && strcmp(cq, "simulated") == 0)
91		dp->d_flags |= D_RAMDISK;
92	if (cgetcap(buf, "sf", ':') != NULL)
93		dp->d_flags |= D_BADSECT;
94
95#define getnumdflt(field, dname, dflt) \
96        { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; }
97
98	getnumdflt(dp->d_secsize, "se", DEV_BSIZE);
99	getnumdflt(dp->d_ntracks, "nt", 0);
100	getnumdflt(dp->d_nsectors, "ns", 0);
101	getnumdflt(dp->d_ncylinders, "nc", 0);
102
103	if (cgetstr(buf, "dt", &cq) > 0)
104		dp->d_type = gettype(cq, dktypenames);
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 && cgetstr(buf, ptype, &cq) > 0)
144				pp->p_fstype = gettype(cq, fstypenames);
145			max = p;
146		}
147	}
148	dp->d_npartitions = max + 1 - 'a';
149	(void)strcpy(psize, "dx");
150	dx = dp->d_drivedata;
151	for (p = '0'; p < '0' + NDDATA; p++, dx++) {
152		psize[1] = p;
153		getnumdflt(*dx, psize, 0);
154	}
155	dp->d_magic = DISKMAGIC;
156	dp->d_magic2 = DISKMAGIC;
157	free(buf);
158	return (dp);
159}
160