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
44static int
45gettype(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
57struct disklabel *
58getdiskbyname(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