//

// Copyright (C) 2014 Mikael Berthe <mikael@lilotux.net>

//

// This program 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 2 of the License, or (at

// your option) any later version.

// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris

package main

import "os"

import "syscall"

// ByInode is a FileObjList type with a sort interface

type ByInode FileObjList

func (a ByInode) Len() int      { return len(a) }

func (a ByInode) Swap(i, j int) { a[i], a[j] = a[j], a[i] }

func (a ByInode) Less(i, j int) bool {

	// Sort by device id first

	iDevice := a[i].Sys().(*syscall.Stat_t).Dev

	jDevice := a[j].Sys().(*syscall.Stat_t).Dev

	switch {

	case iDevice < jDevice:

		return true

	case iDevice > jDevice:

		return false

	}

	iInode := a[i].Sys().(*syscall.Stat_t).Ino

	jInode := a[j].Sys().(*syscall.Stat_t).Ino

	return iInode < jInode

}

// OSHasInodes returns true iff the O.S. uses inodes for its filesystems.

func OSHasInodes() bool {

	return true

}

// GetDevIno returns the device and inode IDs of a given file.

func GetDevIno(fi os.FileInfo) (uint64, uint64) {

	dev := fi.Sys().(*syscall.Stat_t).Dev

	ino := fi.Sys().(*syscall.Stat_t).Ino

	return uint64(dev), uint64(ino)

}