From ac9ef7eef97d4c217a849e185ca5e06c560b9c83 Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Mon, 20 Dec 2010 01:18:21 +0100
Subject: [PATCH] plan9 subpartition support

---
 Makefile.util.def           |   1 +
 grub-core/Makefile.core.def |   5 ++
 grub-core/partmap/plan.c    | 118 ++++++++++++++++++++++++++++++++++++
 3 files changed, 124 insertions(+)
 create mode 100644 grub-core/partmap/plan.c

diff --git a/Makefile.util.def b/Makefile.util.def
index 74984e2e9..2b9d28cf0 100644
--- a/Makefile.util.def
+++ b/Makefile.util.def
@@ -91,6 +91,7 @@ library = {
   common = grub-core/partmap/gpt.c;
   common = grub-core/partmap/msdos.c;
   common = grub-core/partmap/sun.c;
+  common = grub-core/partmap/plan.c;
   common = grub-core/partmap/sunpc.c;
   common = grub-core/partmap/bsdlabel.c;
   common = grub-core/script/function.c;
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index ae604b3c6..9151e434b 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -1308,6 +1308,11 @@ module = {
   common = partmap/sun.c;
 };
 
+module = {
+  name = part_plan;
+  common = partmap/plan.c;
+};
+
 module = {
   name = part_bsd;
   common = partmap/bsdlabel.c;
diff --git a/grub-core/partmap/plan.c b/grub-core/partmap/plan.c
new file mode 100644
index 000000000..c62d04b73
--- /dev/null
+++ b/grub-core/partmap/plan.c
@@ -0,0 +1,118 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2010  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/partition.h>
+#include <grub/disk.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/dl.h>
+#include <grub/symbol.h>
+#include <grub/types.h>
+#include <grub/err.h>
+
+static struct grub_partition_map grub_plan_partition_map;
+
+static grub_err_t
+plan_partition_map_iterate (grub_disk_t disk,
+			    int (*hook) (grub_disk_t disk,
+					 const grub_partition_t partition))
+{
+  struct grub_partition p;
+  int ptr = 0;
+  grub_err_t err;
+
+  p.partmap = &grub_plan_partition_map;
+  p.msdostype = 0;
+
+  for (p.number = 0; ; p.number++)
+    {
+      char sig[sizeof ("part ") - 1];
+      char c;
+
+      p.offset = (ptr >> GRUB_DISK_SECTOR_BITS) + 1;
+      p.index = ptr & (GRUB_DISK_SECTOR_SIZE - 1);
+
+      err = grub_disk_read (disk, 1, ptr, sizeof (sig), sig);
+      if (err)
+	return err;
+      if (grub_memcmp (sig, "part ", sizeof ("part ") - 1) != 0)
+	break;
+      ptr += sizeof (sig);
+      do
+	{
+	  err = grub_disk_read (disk, 1, ptr, 1, &c);
+	  if (err)
+	    return err;
+	  ptr++;
+	}
+      while (grub_isdigit (c) || grub_isalpha (c));
+      if (c != ' ')
+	break;
+      p.start = 0;
+      while (1)
+	{
+	  err = grub_disk_read (disk, 1, ptr, 1, &c);
+	  if (err)
+	    return err;
+	  ptr++;
+	  if (!grub_isdigit (c))
+	    break;
+	  p.start = p.start * 10 + (c - '0');
+	}
+      if (c != ' ')
+	break;
+      p.len = 0;
+      while (1)
+	{
+	  err = grub_disk_read (disk, 1, ptr, 1, &c);
+	  if (err)
+	    return err;
+	  ptr++;
+	  if (!grub_isdigit (c))
+	    break;
+	  p.len = p.len * 10 + (c - '0');
+	}
+      if (c != '\n')
+	break;
+      p.len -= p.start;
+      if (hook (disk, &p))
+	return grub_errno;
+    }
+  if (p.number == 0)
+    return grub_error (GRUB_ERR_BAD_PART_TABLE, "not a plan partition table");
+
+  return GRUB_ERR_NONE;
+}
+
+/* Partition map type.  */
+static struct grub_partition_map grub_plan_partition_map =
+  {
+    .name = "plan",
+    .iterate = plan_partition_map_iterate,
+  };
+
+GRUB_MOD_INIT(part_plan)
+{
+  grub_partition_map_register (&grub_plan_partition_map);
+}
+
+GRUB_MOD_FINI(part_plan)
+{
+  grub_partition_map_unregister (&grub_plan_partition_map);
+}
+