From b507ce0382876bb693498cf86208a53917b3cb29 Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Wed, 16 Sep 2009 16:12:29 +0200
Subject: [PATCH] libblkid: add MINIX partitions support

Signed-off-by: Karel Zak <kzak@redhat.com>
---
 shlibs/blkid/src/partitions/Makefile.am  |  3 +-
 shlibs/blkid/src/partitions/dos.c        |  1 +
 shlibs/blkid/src/partitions/minix.c      | 99 ++++++++++++++++++++++++
 shlibs/blkid/src/partitions/partitions.c |  3 +-
 shlibs/blkid/src/partitions/partitions.h |  1 +
 5 files changed, 105 insertions(+), 2 deletions(-)
 create mode 100644 shlibs/blkid/src/partitions/minix.c

diff --git a/shlibs/blkid/src/partitions/Makefile.am b/shlibs/blkid/src/partitions/Makefile.am
index 906ba68c..30ce0ee3 100644
--- a/shlibs/blkid/src/partitions/Makefile.am
+++ b/shlibs/blkid/src/partitions/Makefile.am
@@ -16,4 +16,5 @@ libblkid_partitions_la_SOURCES = partitions.c \
 				sgi.c \
 				mac.c \
 				dos.c \
-				dos.h
+				dos.h \
+				minix.c
diff --git a/shlibs/blkid/src/partitions/dos.c b/shlibs/blkid/src/partitions/dos.c
index d03e18e6..21728a5a 100644
--- a/shlibs/blkid/src/partitions/dos.c
+++ b/shlibs/blkid/src/partitions/dos.c
@@ -26,6 +26,7 @@ static const struct dos_subtypes {
 	{ BLKID_OPENBSD_PARTITION, &bsd_pt_idinfo },
 	{ BLKID_UNIXWARE_PARTITION, &unixware_pt_idinfo },
 	{ BLKID_SOLARIS_X86_PARTITION, &solaris_x86_pt_idinfo },
+	{ BLKID_MINIX_PARTITION, &minix_pt_idinfo }
 };
 
 static inline int is_extended(struct dos_partition *p)
diff --git a/shlibs/blkid/src/partitions/minix.c b/shlibs/blkid/src/partitions/minix.c
new file mode 100644
index 00000000..e2f9140f
--- /dev/null
+++ b/shlibs/blkid/src/partitions/minix.c
@@ -0,0 +1,99 @@
+/*
+ * Minix partition parsing code
+ *
+ * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "partitions.h"
+#include "dos.h"
+
+/*
+ * Minix subpartitions are always within primary dos partition.
+ */
+#define MINIX_MAXPARTITIONS 4
+
+static int probe_minix_pt(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	struct dos_partition *p;
+	blkid_parttable tab = NULL;
+	blkid_partition parent;
+	blkid_partlist ls;
+	unsigned char *data;
+	int i;
+
+	data = blkid_probe_get_sector(pr, 0);
+	if (!data)
+		goto nothing;
+
+	ls = blkid_probe_get_partlist(pr);
+	if (!ls)
+		goto err;
+
+	/* Parent is required, because Minix uses the same PT as DOS and
+	 * difference is only in primary partition (parent) type.
+	 */
+	parent = blkid_partlist_get_parent(ls);
+	if (!parent)
+		goto nothing;
+
+	if (blkid_partition_get_type(parent) != BLKID_MINIX_PARTITION)
+		goto nothing;
+
+	if (blkid_partitions_need_typeonly(pr))
+		/* caller does not ask for details about partitions */
+		return 0;
+
+	p = (struct dos_partition *) (data + BLKID_MSDOS_PT_OFFSET);
+
+	tab = blkid_partlist_new_parttable(ls, "minix", BLKID_MSDOS_PT_OFFSET);
+	if (!tab)
+		goto err;
+
+	for (i = 0; i < MINIX_MAXPARTITIONS; i++, p++) {
+		uint32_t start, size;
+
+		if (p->sys_type != BLKID_MINIX_PARTITION)
+			continue;
+
+		start = dos_partition_start(p);
+		size = dos_partition_size(p);
+
+		if (parent && !blkid_is_nested_dimension(parent, start, size)) {
+			DBG(DEBUG_LOWPROBE, printf(
+				"WARNING: minix partition (%d) overflow "
+				"detected, ignore\n", i));
+			continue;
+		}
+
+		if (!blkid_partlist_add_partition(ls, tab,
+					p->sys_type, start, size))
+			goto err;
+	}
+
+	return 0;
+
+nothing:
+	return 1;
+err:
+	return -1;
+}
+
+/* same as DOS */
+const struct blkid_idinfo minix_pt_idinfo =
+{
+	.name		= "minix",
+	.probefunc	= probe_minix_pt,
+	.magics		=
+	{
+		{ .magic = "\x55\xAA", .len = 2, .sboff = 510 },
+		{ NULL }
+	}
+};
+
diff --git a/shlibs/blkid/src/partitions/partitions.c b/shlibs/blkid/src/partitions/partitions.c
index 064ec69a..0f74d5a0 100644
--- a/shlibs/blkid/src/partitions/partitions.c
+++ b/shlibs/blkid/src/partitions/partitions.c
@@ -109,7 +109,8 @@ static const struct blkid_idinfo *idinfos[] =
 	&mac_pt_idinfo,
 	&bsd_pt_idinfo,
 	&unixware_pt_idinfo,
-	&solaris_x86_pt_idinfo
+	&solaris_x86_pt_idinfo,
+	&minix_pt_idinfo
 };
 
 /*
diff --git a/shlibs/blkid/src/partitions/partitions.h b/shlibs/blkid/src/partitions/partitions.h
index 205311a5..668f8e93 100644
--- a/shlibs/blkid/src/partitions/partitions.h
+++ b/shlibs/blkid/src/partitions/partitions.h
@@ -43,5 +43,6 @@ extern const struct blkid_idinfo sun_pt_idinfo;
 extern const struct blkid_idinfo sgi_pt_idinfo;
 extern const struct blkid_idinfo mac_pt_idinfo;
 extern const struct blkid_idinfo dos_pt_idinfo;
+extern const struct blkid_idinfo minix_pt_idinfo;
 
 #endif /* BLKID_PARTITIONS_H */
-- 
2.39.5