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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"
func fileInfoFromStat(fi *FileInfo, d *Dir) *FileInfo {
fi.Dev = uint64(d.Qid.Vers) | uint64(d.Qid.Type<<32)
fi.Ino = d.Qid.Path
fi.Mode = uint32(d.Mode) & 0777
if (d.Mode & syscall.DMDIR) == syscall.DMDIR {
fi.Mode |= syscall.S_IFDIR
} else {
fi.Mode |= syscall.S_IFREG
}
fi.Size = int64(d.Length)
fi.Atime_ns = 1e9 * int64(d.Atime)
fi.Mtime_ns = 1e9 * int64(d.Mtime)
fi.Name = d.Name
fi.FollowedSymlink = false
return fi
}
// arg is an open *File or a path string.
func dirstat(arg interface{}) (d *Dir, err error) {
var name string
nd := syscall.STATFIXLEN + 16*4
for i := 0; i < 2; i++ { /* should work by the second try */
buf := make([]byte, nd)
var n int
var e syscall.Error
switch syscallArg := arg.(type) {
case *File:
name = syscallArg.name
n, e = syscall.Fstat(syscallArg.fd, buf)
case string:
name = syscallArg
n, e = syscall.Stat(name, buf)
}
if e != nil {
return nil, &PathError{"stat", name, e}
}
if n < syscall.STATFIXLEN {
return nil, &PathError{"stat", name, Eshortstat}
}
ntmp, _ := gbit16(buf)
nd = int(ntmp)
if nd <= n {
d, e := UnmarshalDir(buf[:n])
if e != nil {
return nil, &PathError{"stat", name, e}
}
return d, e
}
}
return nil, &PathError{"stat", name, Ebadstat}
}
// Stat returns a FileInfo structure describing the named file and an error, if any.
func Stat(name string) (fi *FileInfo, err error) {
d, err := dirstat(name)
if iserror(err) {
return nil, err
}
return fileInfoFromStat(new(FileInfo), d), err
}
// Lstat returns the FileInfo structure describing the named file and an
// error, if any. If the file is a symbolic link (though Plan 9 does not have symbolic links),
// the returned FileInfo describes the symbolic link. Lstat makes no attempt to follow the link.
func Lstat(name string) (fi *FileInfo, err error) {
d, err := dirstat(name)
if iserror(err) {
return nil, err
}
return fileInfoFromStat(new(FileInfo), d), err
}
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