/*
** 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);
}