Source file
src/os/dir_plan9.go
Documentation: os
1
2
3
4
5 package os
6
7 import (
8 "io"
9 "syscall"
10 )
11
12 func (file *File) readdir(n int, mode readdirMode) (names []string, dirents []DirEntry, infos []FileInfo, err error) {
13
14 if file.dirinfo == nil {
15 file.dirinfo = new(dirInfo)
16 }
17 d := file.dirinfo
18 size := n
19 if size <= 0 {
20 size = 100
21 n = -1
22 }
23 for n != 0 {
24
25 if d.bufp >= d.nbuf {
26 nb, err := file.Read(d.buf[:])
27
28
29 d.bufp, d.nbuf = 0, nb
30
31 if err != nil {
32 if err == io.EOF {
33 break
34 }
35 return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: err}
36 }
37 if nb < syscall.STATFIXLEN {
38 return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: syscall.ErrShortStat}
39 }
40 }
41
42
43 b := d.buf[d.bufp:]
44 m := int(uint16(b[0])|uint16(b[1])<<8) + 2
45 if m < syscall.STATFIXLEN {
46 return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: syscall.ErrShortStat}
47 }
48
49 dir, err := syscall.UnmarshalDir(b[:m])
50 if err != nil {
51 return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: err}
52 }
53
54 if mode == readdirName {
55 names = append(names, dir.Name)
56 } else {
57 f := fileInfoFromStat(dir)
58 if mode == readdirDirEntry {
59 dirents = append(dirents, dirEntry{f})
60 } else {
61 infos = append(infos, f)
62 }
63 }
64 d.bufp += m
65 n--
66 }
67
68 if n > 0 && len(names)+len(dirents)+len(infos) == 0 {
69 return nil, nil, nil, io.EOF
70 }
71 return names, dirents, infos, nil
72 }
73
74 type dirEntry struct {
75 fs *fileStat
76 }
77
78 func (de dirEntry) Name() string { return de.fs.Name() }
79 func (de dirEntry) IsDir() bool { return de.fs.IsDir() }
80 func (de dirEntry) Type() FileMode { return de.fs.Mode().Type() }
81 func (de dirEntry) Info() (FileInfo, error) { return de.fs, nil }
82
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