/*
** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
** Distributed under the terms of the MIT License.
*/


#include <fs_info.h>

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>

#include <errno_private.h>
#include <syscalls.h>
#include <syscall_utils.h>


dev_t
dev_for_path(const char *path)
{
	struct stat stat;
	int status = _kern_read_stat(AT_FDCWD, path, true, &stat, sizeof(struct stat));
	if (status == B_OK)
		return stat.st_dev;

	RETURN_AND_SET_ERRNO(status);
}


dev_t
next_dev(int32 *_cookie)
{
	return _kern_next_device(_cookie);
		// For some reason, this one returns its error code directly
}


int
fs_stat_dev(dev_t device, fs_info *info)
{
	status_t status = _kern_read_fs_info(device, info);

	if (info != NULL) {
		if (info->volume_name[0] == 0) {
			// Give a default name to unnamed volumes
			off_t divisor = 1ULL << 40;
			off_t diskSize = info->total_blocks * info->block_size;

			char unit = 'T';
			if (diskSize < divisor) {
				divisor = 1UL << 30;
				unit = 'G';
				if (diskSize < divisor) {
					divisor = 1UL << 20;
					unit = 'M';
				}
			}

			double size = double((10 * diskSize + divisor - 1) / divisor);

			sprintf(info->volume_name, "%g %ciB %s volume", size / 10, unit, info->fsh_name);
		}
	}

	RETURN_AND_SET_ERRNO(status);
}