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#include <stdio.h>
#include "partx.h"
#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
#define XBSD_MAXPARTITIONS 16
#define BSD_FS_UNUSED 0
struct bsd_disklabel {
unsigned int d_magic; /* the magic number */
short int d_type; /* drive type */
short int d_subtype; /* controller/d_type specific */
char d_typename[16]; /* type name, e.g. "eagle" */
char d_packname[16]; /* pack identifier */
unsigned int d_secsize; /* # of bytes per sector */
unsigned int d_nsectors; /* # of data sectors per track */
unsigned int d_ntracks; /* # of tracks per cylinder */
unsigned int d_ncylinders; /* # of data cylinders per unit */
unsigned int d_secpercyl; /* # of data sectors per cylinder */
unsigned int d_secperunit; /* # of data sectors per unit */
unsigned short d_sparespertrack;/* # of spare sectors per track */
unsigned short d_sparespercyl; /* # of spare sectors per cylinder */
unsigned int d_acylinders; /* # of alt. cylinders per unit */
unsigned short d_rpm; /* rotational speed */
unsigned short d_interleave; /* hardware sector interleave */
unsigned short d_trackskew; /* sector 0 skew, per track */
unsigned short d_cylskew; /* sector 0 skew, per cylinder */
unsigned int d_headswitch; /* head switch time, usec */
unsigned int d_trkseek; /* track-to-track seek, usec */
unsigned int d_flags; /* generic flags */
unsigned int d_drivedata[5]; /* drive-type specific information */
unsigned int d_spare[5]; /* reserved for future use */
unsigned int d_magic2; /* the magic number (again) */
unsigned short d_checksum; /* xor of data incl. partitions */
/* filesystem and partition information: */
unsigned short d_npartitions; /* number of partitions in following */
unsigned int d_bbsize; /* size of boot area at sn0, bytes */
unsigned int d_sbsize; /* max size of fs superblock, bytes */
struct bsd_partition { /* the partition table */
unsigned int p_size; /* number of sectors in partition */
unsigned int p_offset; /* starting sector */
unsigned int p_fsize; /* filesystem basic fragment size */
unsigned char p_fstype; /* filesystem type, see below */
unsigned char p_frag; /* filesystem fragments per block */
unsigned short p_cpg; /* filesystem cylinders per group */
} d_partitions[XBSD_MAXPARTITIONS];/* actually may be more */
};
int
read_bsd_pt(int fd, struct slice all, struct slice *sp, int ns) {
struct bsd_disklabel *l;
struct bsd_partition *p;
unsigned int offset = all.start;
int max_partitions;
unsigned char *bp;
int n = 0;
bp = getblock(fd, offset+1); /* 1 sector suffices */
if (bp == NULL)
return -1;
l = (struct bsd_disklabel *) bp;
if (l->d_magic != BSD_DISKMAGIC)
return -1;
max_partitions = 16;
if (l->d_npartitions < max_partitions)
max_partitions = l->d_npartitions;
for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) {
if (p->p_fstype == BSD_FS_UNUSED)
/* nothing */;
else if (n < ns) {
sp[n].start = p->p_offset;
sp[n].size = p->p_size;
n++;
} else {
fprintf(stderr,
"bsd_partition: too many slices\n");
break;
}
}
return n;
}
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