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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 (
"syscall"
)
const (
blockSize = 4096
)
// Readdirnames reads the contents of the directory associated with file and
// returns an array of up to count names, in directory order. Subsequent
// calls on the same file will yield further names.
// A negative count means to read until EOF.
// Readdirnames returns the array and an Error, if any.
func (file *File) Readdirnames(count int) (names []string, err Error) {
// If this file has no dirinfo, create one.
if file.dirinfo == nil {
file.dirinfo = new(dirInfo)
// The buffer must be at least a block long.
file.dirinfo.buf = make([]byte, blockSize)
}
d := file.dirinfo
size := count
if size < 0 {
size = 100
}
names = make([]string, 0, size) // Empty with room to grow.
for count != 0 {
// Refill the buffer if necessary
if d.bufp >= d.nbuf {
d.bufp = 0
var errno int
d.nbuf, errno = syscall.ReadDirent(file.fd, d.buf)
if errno != 0 {
return names, NewSyscallError("readdirent", errno)
}
if d.nbuf <= 0 {
break // EOF
}
}
// Drain the buffer
var nb, nc int
nb, nc, names = syscall.ParseDirent(d.buf[d.bufp:d.nbuf], count, names)
d.bufp += nb
count -= nc
}
return names, nil
}
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