disklabel.c revision 101993 
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#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)disklabel.c	8.2 (Berkeley) 5/3/95";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/gen/disklabel.c 101993 2002-08-16 15:33:20Z bmilekic $");
39
40#include <sys/param.h>
41#define DKTYPENAMES
42#define FSTYPENAMES
43#include <sys/disklabel.h>
44
45#include <fcntl.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <unistd.h>
50#include <ctype.h>
51
52static int
53gettype(char *t, const char **names)
54{
55	const char **nm;
56
57	for (nm = names; *nm; nm++)
58		if (strcasecmp(t, *nm) == 0)
59			return (nm - names);
60	if (isdigit((unsigned char)*t))
61		return (atoi(t));
62	return (0);
63}
64
65struct disklabel *
66getdiskbyname(const char *name)
67{
68	static struct	disklabel disk;
69	struct	disklabel *dp = &disk;
70	struct partition *pp;
71	char	*buf;
72	char  	*db_array[2] = { _PATH_DISKTAB, 0 };
73	char	*cp, *cq;	/* can't be register */
74	char	p, max, psize[3], pbsize[3],
75		pfsize[3], poffset[3], ptype[3];
76	u_int32_t *dx;
77
78	if (cgetent(&buf, db_array, (char *) name) < 0)
79		return NULL;
80
81	bzero((char *)&disk, sizeof(disk));
82	/*
83	 * typename
84	 */
85	cq = dp->d_typename;
86	cp = buf;
87	while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 &&
88	    (*cq = *cp) && *cq != '|' && *cq != ':')
89		cq++, cp++;
90	*cq = '\0';
91
92	if (cgetstr(buf, "ty", &cq) > 0 && strcmp(cq, "removable") == 0)
93		dp->d_flags |= D_REMOVABLE;
94	else  if (cq && strcmp(cq, "simulated") == 0)
95		dp->d_flags |= D_RAMDISK;
96	if (cgetcap(buf, "sf", ':') != NULL)
97		dp->d_flags |= D_BADSECT;
98
99#define getnumdflt(field, dname, dflt) \
100        { long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; }
101
102	getnumdflt(dp->d_secsize, "se", DEV_BSIZE);
103	getnumdflt(dp->d_ntracks, "nt", 0);
104	getnumdflt(dp->d_nsectors, "ns", 0);
105	getnumdflt(dp->d_ncylinders, "nc", 0);
106
107	if (cgetstr(buf, "dt", &cq) > 0)
108		dp->d_type = gettype(cq, dktypenames);
109	else
110		getnumdflt(dp->d_type, "dt", 0);
111	getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks);
112	getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders);
113	getnumdflt(dp->d_rpm, "rm", 3600);
114	getnumdflt(dp->d_interleave, "il", 1);
115	getnumdflt(dp->d_trackskew, "sk", 0);
116	getnumdflt(dp->d_cylskew, "cs", 0);
117	getnumdflt(dp->d_headswitch, "hs", 0);
118	getnumdflt(dp->d_trkseek, "ts", 0);
119	getnumdflt(dp->d_bbsize, "bs", BBSIZE);
120	getnumdflt(dp->d_sbsize, "sb", 0);
121	strcpy(psize, "px");
122	strcpy(pbsize, "bx");
123	strcpy(pfsize, "fx");
124	strcpy(poffset, "ox");
125	strcpy(ptype, "tx");
126	max = 'a' - 1;
127	pp = &dp->d_partitions[0];
128	for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) {
129		long l;
130		psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p;
131		if (cgetnum(buf, psize, &l) == -1)
132			pp->p_size = 0;
133		else {
134			pp->p_size = l;
135			cgetnum(buf, poffset, &l);
136			pp->p_offset = l;
137			getnumdflt(pp->p_fsize, pfsize, 0);
138			if (pp->p_fsize) {
139				long bsize;
140
141				if (cgetnum(buf, pbsize, &bsize) == 0)
142					pp->p_frag = bsize / pp->p_fsize;
143				else
144					pp->p_frag = 8;
145			}
146			getnumdflt(pp->p_fstype, ptype, 0);
147			if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0)
148				pp->p_fstype = gettype(cq, fstypenames);
149			max = p;
150		}
151	}
152	dp->d_npartitions = max + 1 - 'a';
153	(void)strcpy(psize, "dx");
154	dx = dp->d_drivedata;
155	for (p = '0'; p < '0' + NDDATA; p++, dx++) {
156		psize[1] = p;
157		getnumdflt(*dx, psize, 0);
158	}
159	dp->d_magic = DISKMAGIC;
160	dp->d_magic2 = DISKMAGIC;
161	free(buf);
162	return (dp);
163}
164