freebsd-dev/lib/libc/gen/disklabel.c

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/*
* Copyright (c) 1983, 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)disklabel.c 8.2 (Berkeley) 5/3/95";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include <sys/param.h>
#define DKTYPENAMES
#define FSTYPENAMES
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#include <sys/disklabel.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
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static int
gettype(char *t, const char **names)
{
const char **nm;
for (nm = names; *nm; nm++)
if (strcasecmp(t, *nm) == 0)
return (nm - names);
if (isdigit((unsigned char)*t))
return (atoi(t));
return (0);
}
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struct disklabel *
getdiskbyname(const char *name)
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{
static struct disklabel disk;
struct disklabel *dp = &disk;
struct partition *pp;
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char *buf;
char *db_array[2] = { _PATH_DISKTAB, 0 };
char *cp, *cq; /* can't be register */
char p, max, psize[3], pbsize[3],
pfsize[3], poffset[3], ptype[3];
u_int32_t *dx;
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if (cgetent(&buf, db_array, (char *) name) < 0)
return NULL;
bzero((char *)&disk, sizeof(disk));
/*
* typename
*/
cq = dp->d_typename;
cp = buf;
while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 &&
(*cq = *cp) && *cq != '|' && *cq != ':')
cq++, cp++;
*cq = '\0';
if (cgetstr(buf, "ty", &cq) > 0 && strcmp(cq, "removable") == 0)
dp->d_flags |= D_REMOVABLE;
else if (cq && strcmp(cq, "simulated") == 0)
dp->d_flags |= D_RAMDISK;
if (cgetcap(buf, "sf", ':') != NULL)
dp->d_flags |= D_BADSECT;
#define getnumdflt(field, dname, dflt) \
{ long f; (field) = (cgetnum(buf, dname, &f) == -1) ? (dflt) : f; }
getnumdflt(dp->d_secsize, "se", DEV_BSIZE);
getnumdflt(dp->d_ntracks, "nt", 0);
getnumdflt(dp->d_nsectors, "ns", 0);
getnumdflt(dp->d_ncylinders, "nc", 0);
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if (cgetstr(buf, "dt", &cq) > 0)
dp->d_type = gettype(cq, dktypenames);
else
getnumdflt(dp->d_type, "dt", 0);
getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks);
getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders);
getnumdflt(dp->d_rpm, "rm", 3600);
getnumdflt(dp->d_interleave, "il", 1);
getnumdflt(dp->d_trackskew, "sk", 0);
getnumdflt(dp->d_cylskew, "cs", 0);
getnumdflt(dp->d_headswitch, "hs", 0);
getnumdflt(dp->d_trkseek, "ts", 0);
getnumdflt(dp->d_bbsize, "bs", BBSIZE);
getnumdflt(dp->d_sbsize, "sb", 0);
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strcpy(psize, "px");
strcpy(pbsize, "bx");
strcpy(pfsize, "fx");
strcpy(poffset, "ox");
strcpy(ptype, "tx");
max = 'a' - 1;
pp = &dp->d_partitions[0];
for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) {
long l;
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psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p;
if (cgetnum(buf, psize, &l) == -1)
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pp->p_size = 0;
else {
pp->p_size = l;
cgetnum(buf, poffset, &l);
pp->p_offset = l;
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getnumdflt(pp->p_fsize, pfsize, 0);
if (pp->p_fsize) {
long bsize;
if (cgetnum(buf, pbsize, &bsize) == 0)
pp->p_frag = bsize / pp->p_fsize;
else
pp->p_frag = 8;
}
getnumdflt(pp->p_fstype, ptype, 0);
if (pp->p_fstype == 0 && cgetstr(buf, ptype, &cq) > 0)
pp->p_fstype = gettype(cq, fstypenames);
max = p;
}
}
dp->d_npartitions = max + 1 - 'a';
(void)strcpy(psize, "dx");
dx = dp->d_drivedata;
for (p = '0'; p < '0' + NDDATA; p++, dx++) {
psize[1] = p;
getnumdflt(*dx, psize, 0);
}
dp->d_magic = DISKMAGIC;
dp->d_magic2 = DISKMAGIC;
free(buf);
return (dp);
}