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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package os

import (
        "syscall"
        "time"
)

func sameFile(sys1, sys2 interface{}) bool {
        stat1 := sys1.(*syscall.Stat_t)
        stat2 := sys2.(*syscall.Stat_t)
        return stat1.Dev == stat2.Dev && stat1.Ino == stat2.Ino
}

func fileInfoFromStat(st *syscall.Stat_t, name string) FileInfo {
        fs := &fileStat{
                name:    basename(name),
                size:    int64(st.Size),
                modTime: timestrucToTime(st.Mtime),
                sys:     st,
        }
        fs.mode = FileMode(st.Mode & 0777)
        switch st.Mode & syscall.S_IFMT {
        case syscall.S_IFBLK, syscall.S_IFCHR:
                fs.mode |= ModeDevice
        case syscall.S_IFDIR:
                fs.mode |= ModeDir
        case syscall.S_IFIFO:
                fs.mode |= ModeNamedPipe
        case syscall.S_IFLNK:
                fs.mode |= ModeSymlink
        case syscall.S_IFREG:
                // nothing to do
        case syscall.S_IFSOCK:
                fs.mode |= ModeSocket
        }
        if st.Mode&syscall.S_ISGID != 0 {
                fs.mode |= ModeSetgid
        }
        if st.Mode&syscall.S_ISUID != 0 {
                fs.mode |= ModeSetuid
        }
        return fs
}

func timestrucToTime(ts syscall.Timestruc) time.Time {
        return time.Unix(int64(ts.Sec), int64(ts.Nsec))
}

// For testing.
func atime(fi FileInfo) time.Time {
        return timestrucToTime(fi.(*fileStat).Sys().(*syscall.Stat_t).Atime)
}