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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"
"syscall"
)
func (file *File) readdir(n int) ([]FileInfo, 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
}
fi := make([]FileInfo, 0, size) // Empty with room to grow.
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 fi, &PathError{"readdir", file.name, err}
}
if nb < syscall.STATFIXLEN {
return fi, &PathError{"readdir", file.name, 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 fi, &PathError{"readdir", file.name, syscall.ErrShortStat}
}
dir, err := syscall.UnmarshalDir(b[:m])
if err != nil {
return fi, &PathError{"readdir", file.name, err}
}
fi = append(fi, fileInfoFromStat(dir))
d.bufp += m
n--
}
if n >= 0 && len(fi) == 0 {
return fi, io.EOF
}
return fi, nil
}
func (file *File) readdirnames(n int) (names []string, err error) {
fi, err := file.Readdir(n)
names = make([]string, len(fi))
for i := range fi {
names[i] = fi[i].Name()
}
return
}
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