1 files changed, 83 insertions, 0 deletions
diff --git a/partx/bsd.c b/partx/bsd.c
new file mode 100644
index 0000000..4532c32
--- /dev/null
+++ b/partx/bsd.c
@@ -0,0 +1,83 @@
+#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;
+}