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// Copyright 2009 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 (
"io"
"io/fs"
"syscall"
)
func (file *File) readdir(n int, mode readdirMode) (names []string, dirents []DirEntry, infos []FileInfo, err error) {
// If this file has no dirinfo, create one.
if file.dirinfo == nil {
file.dirinfo = new(dirInfo)
}
d := file.dirinfo
size := n
if size <= 0 {
size = 100
n = -1
}
for n != 0 {
// Refill the buffer if necessary.
if d.bufp >= d.nbuf {
nb, err := file.Read(d.buf[:])
// Update the buffer state before checking for errors.
d.bufp, d.nbuf = 0, nb
if err != nil {
if err == io.EOF {
break
}
return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: err}
}
if nb < syscall.STATFIXLEN {
return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: syscall.ErrShortStat}
}
}
// Get a record from the buffer.
b := d.buf[d.bufp:]
m := int(uint16(b[0])|uint16(b[1])<<8) + 2
if m < syscall.STATFIXLEN {
return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: syscall.ErrShortStat}
}
dir, err := syscall.UnmarshalDir(b[:m])
if err != nil {
return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: err}
}
if mode == readdirName {
names = append(names, dir.Name)
} else {
f := fileInfoFromStat(dir)
if mode == readdirDirEntry {
dirents = append(dirents, dirEntry{f})
} else {
infos = append(infos, f)
}
}
d.bufp += m
n--
}
if n > 0 && len(names)+len(dirents)+len(infos) == 0 {
return nil, nil, nil, io.EOF
}
return names, dirents, infos, nil
}
type dirEntry struct {
fs *fileStat
}
func (de dirEntry) Name() string { return de.fs.Name() }
func (de dirEntry) IsDir() bool { return de.fs.IsDir() }
func (de dirEntry) Type() FileMode { return de.fs.Mode().Type() }
func (de dirEntry) Info() (FileInfo, error) { return de.fs, nil }
func (de dirEntry) String() string {
return fs.FormatDirEntry(de)
}