fdisk: add MAC label detection

This patch is based on the old Suse util-linux-2.11q-fs_mac.diff patch.

Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/fdisk/fdiskmaclabel.c b/fdisk/fdiskmaclabel.c
new file mode 100644
index 000000000..06d4a6ed2
--- /dev/null
+++ b/fdisk/fdiskmaclabel.c
@@ -0,0 +1,86 @@
+/*
+  Changes:
+  Sat Mar 20 09:51:38 EST 1999 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+	Internationalization
+*/
+#include <stdio.h>              /* stderr */
+#include <string.h>             /* strstr */
+#include <unistd.h>             /* write */
+
+#include <endian.h>
+
+#include "common.h"
+#include "fdisk.h"
+#include "fdiskmaclabel.h"
+#include "nls.h"
+
+#define MAC_BITMASK 0xffff0000
+
+
+static	int     other_endian = 0;
+static  short	volumes=1;
+
+/*
+ * only dealing with free blocks here
+ */
+
+static void
+mac_info( void ) {
+    puts(
+	_("\n\tThere is a valid Mac label on this disk.\n"
+	"\tUnfortunately fdisk(1) cannot handle these disks.\n"
+	"\tUse either pdisk or parted to modify the partition table.\n"
+	"\tNevertheless some advice:\n"
+	"\t1. fdisk will destroy its contents on write.\n"
+	"\t2. Be sure that this disk is NOT a still vital\n"
+	"\t   part of a volume group. (Otherwise you may\n"
+	"\t   erase the other disks as well, if unmirrored.)\n")
+    );
+}
+
+void
+mac_nolabel( void )
+{
+    maclabel->magic = 0;
+    mac_label = 0;
+    partitions = 4;
+    memset( MBRbuffer, 0, sizeof(MBRbuffer) );	/* avoid fdisk cores */
+    return;
+}
+
+int
+check_mac_label( void )
+{
+	/*
+	Conversion: only 16 bit should compared
+	e.g.: HFS Label is only 16bit long
+	*/
+	int magic_masked = 0 ;
+	magic_masked =  maclabel->magic & MAC_BITMASK ;
+
+	switch (magic_masked) {
+		case MAC_LABEL_MAGIC :
+		case MAC_LABEL_MAGIC_2:
+		case MAC_LABEL_MAGIC_3:
+			goto IS_MAC;
+			break;
+		default:
+			mac_label = 0;
+			other_endian = 0;
+			return 0;
+
+
+	}
+
+IS_MAC:
+    other_endian = (maclabel->magic == MAC_LABEL_MAGIC_SWAPPED); // =?
+    update_units();
+    mac_label = 1;
+    partitions= 1016; // =?
+    volumes = 15;	// =?
+    mac_info();
+    mac_nolabel();		/* %% */
+    mac_label = 1;		/* %% */
+    return 1;
+}
+