/*
 *  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/symbol.h>
#include <grub/types.h>
#include <grub/partition.h>
#include <grub/disk.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/err.h>

GRUB_MOD_LICENSE("GPLv3+");

static struct grub_partition_map grub_plan_partition_map;

static grub_err_t
plan_partition_map_iterate(grub_disk_t disk,
	grub_partition_iterate_hook_t hook,
	void* hook_data)
{
	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, hook_data))
			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);
}

