/*
 * partition.c - parse a linux-like mtd partition definition and register
 *               the new partitions
 *
 * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program 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.
 *
 */

/**
 * @file
 * @brief partition handling and addpart and delpart command
 */

#include <common.h>
#include <command.h>
#include <complete.h>
#include <driver.h>
#include <malloc.h>
#include <partition.h>
#include <errno.h>
#include <xfuncs.h>
#include <fs.h>
#include <linux/stat.h>
#include <libgen.h>
#include <getopt.h>
#include <linux/err.h>

#define SIZE_REMAINING ((ulong)-1)

#define PART_ADD_DEVNAME (1 << 0)

static int mtd_part_do_parse_one(char *devname, const char *partstr,
				 char **endp, loff_t *offset,
				 loff_t devsize, size_t *retsize,
				 unsigned int pflags)
{
	loff_t size;
	char *end;
	char buf[PATH_MAX] = {};
	unsigned long flags = 0;
	int ret = 0;
	struct cdev *cdev;

	memset(buf, 0, PATH_MAX);

	if (*partstr == '-') {
		size = SIZE_REMAINING;
		end = (char *)partstr + 1;
	} else {
		size = strtoull_suffix(partstr, &end, 0);
	}

	if (*end == '@')
		*offset = strtoull_suffix(end+1, &end, 0);

	if (size == SIZE_REMAINING)
		size = devsize - *offset;

	partstr = end;

	if (*partstr == '(') {
		partstr++;
		end = strchr((char *) partstr, ')');
		if (!end) {
			printf("could not find matching ')'\n");
			return -EINVAL;
		}

		if (pflags & PART_ADD_DEVNAME)
			sprintf(buf, "%s.", devname);
		memcpy(buf + strlen(buf), partstr, end - partstr);

		end++;
	}

	if (size + *offset > devsize) {
		printf("%s: partition end is beyond device\n", buf);
		return -EINVAL;
	}

	partstr = end;

	if (*partstr == 'r' && *(partstr + 1) == 'o') {
		flags |= DEVFS_PARTITION_READONLY;
		end = (char *)(partstr + 2);
	}

	if (endp)
		*endp = end;

	*retsize = size;

	cdev = devfs_add_partition(devname, *offset, size, flags, buf);
	if (IS_ERR(cdev)) {
		ret = PTR_ERR(cdev);
		printf("cannot create %s: %s\n", buf, strerror(-ret));
	}

	return ret;
}

static int do_addpart(int argc, char *argv[])
{
	char *devname;
	char *endp;
	loff_t offset = 0;
	loff_t devsize;
	struct stat s;
	int opt;
	unsigned int flags = PART_ADD_DEVNAME;

	while ((opt = getopt(argc, argv, "n")) > 0) {
		switch (opt) {
		case 'n':
			flags &= ~PART_ADD_DEVNAME;
			break;
		}
	}

	if (argc != optind + 2)
		return COMMAND_ERROR_USAGE;

	if (stat(argv[optind], &s)) {
		perror("addpart");
		return 1;
	}
	devsize = s.st_size;

	devname = basename(argv[optind]);

	endp = argv[optind + 1];

	while (1) {
		size_t size = 0;

		if (mtd_part_do_parse_one(devname, endp, &endp, &offset,
					devsize, &size, flags))
			return 1;

		offset += size;

		if (!*endp)
			break;

		if (*endp != ',') {
			printf("parse error\n");
			return 1;
		}
		endp++;
	}

	return 0;
}

BAREBOX_CMD_HELP_START(addpart)

BAREBOX_CMD_HELP_TEXT("Options:")
BAREBOX_CMD_HELP_OPT ("-n", "do not use the device name as prefix of the partition name")
BAREBOX_CMD_HELP_TEXT("")
BAREBOX_CMD_HELP_TEXT("Create partitions on device DEVICE using the partition description")
BAREBOX_CMD_HELP_TEXT("from PART.")
BAREBOX_CMD_HELP_TEXT("PART contains a partition description compatible to the Kernel mtd")
BAREBOX_CMD_HELP_TEXT("commandline partition description:")
BAREBOX_CMD_HELP_TEXT("SIZE1[@OFFSET1](NAME1)[RO],SIZE2[@OFFSET2](NAME2)[RO],...")
BAREBOX_CMD_HELP_TEXT("The size and the offset can be given in decimal (without any prefix) and")
BAREBOX_CMD_HELP_TEXT("in hex (prefixed with 0x). Both can have an optional suffix K, M or G.")
BAREBOX_CMD_HELP_TEXT("The size of the last partition can be specified as '-' for the remaining")
BAREBOX_CMD_HELP_TEXT("space on the device.")
BAREBOX_CMD_HELP_END

BAREBOX_CMD_START(addpart)
	.cmd = do_addpart,
	BAREBOX_CMD_DESC("add a partition description to a device")
	BAREBOX_CMD_OPTS("[-n] DEVICE PART")
	BAREBOX_CMD_GROUP(CMD_GRP_PART)
	BAREBOX_CMD_HELP(cmd_addpart_help)
BAREBOX_CMD_END

static int do_delpart(int argc, char *argv[])
{
	int i, err;

	for (i = 1; i < argc; i++) {
		err = devfs_del_partition(basename(argv[i]));
		if (err) {
			printf("cannot delete %s: %s\n", argv[i], strerror(-err));
			break;
		}
	}

	return 1;
}

BAREBOX_CMD_HELP_START(delpart)
BAREBOX_CMD_HELP_TEXT("Delete partitions previously added to a device with addpart.")
BAREBOX_CMD_HELP_END

BAREBOX_CMD_START(delpart)
	.cmd = do_delpart,
	BAREBOX_CMD_DESC("delete partition(s)")
	BAREBOX_CMD_OPTS("PART...")
	BAREBOX_CMD_GROUP(CMD_GRP_PART)
	BAREBOX_CMD_HELP(cmd_delpart_help)
	BAREBOX_CMD_COMPLETE(devfs_partition_complete)
BAREBOX_CMD_END