// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os
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import (
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"io"
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"syscall"
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)
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func (file *File) readdir(n int) ([]FileInfo, error) {
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// If this file has no dirinfo, create one.
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if file.dirinfo == nil {
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file.dirinfo = new(dirInfo)
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}
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d := file.dirinfo
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size := n
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if size <= 0 {
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size = 100
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n = -1
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}
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fi := make([]FileInfo, 0, size) // Empty with room to grow.
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for n != 0 {
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// Refill the buffer if necessary.
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if d.bufp >= d.nbuf {
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nb, err := file.Read(d.buf[:])
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// Update the buffer state before checking for errors.
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d.bufp, d.nbuf = 0, nb
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if err != nil {
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if err == io.EOF {
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break
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}
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return fi, &PathError{"readdir", file.name, err}
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}
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if nb < syscall.STATFIXLEN {
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return fi, &PathError{"readdir", file.name, syscall.ErrShortStat}
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}
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}
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// Get a record from the buffer.
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b := d.buf[d.bufp:]
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m := int(uint16(b[0])|uint16(b[1])<<8) + 2
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if m < syscall.STATFIXLEN {
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return fi, &PathError{"readdir", file.name, syscall.ErrShortStat}
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}
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dir, err := syscall.UnmarshalDir(b[:m])
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if err != nil {
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return fi, &PathError{"readdir", file.name, err}
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}
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fi = append(fi, fileInfoFromStat(dir))
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d.bufp += m
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n--
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}
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if n >= 0 && len(fi) == 0 {
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return fi, io.EOF
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}
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return fi, nil
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}
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func (file *File) readdirnames(n int) (names []string, err error) {
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fi, err := file.Readdir(n)
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names = make([]string, len(fi))
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for i := range fi {
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names[i] = fi[i].Name()
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}
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return
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}
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