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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.

// +build darwin freebsd linux netbsd openbsd

package os

import (

        "io"

        "syscall"

)

const (

        blockSize = 4096

)

func (f *File) readdirnames(n int) (names []string, err error) {

        // If this file has no dirinfo, create one.

        if f.dirinfo == nil {

                f.dirinfo = new(dirInfo)

                // The buffer must be at least a block long.

                f.dirinfo.buf = make([]byte, blockSize)

        }

        d := f.dirinfo

        size := n

        if size <= 0 {

                size = 100

                n = -1

        }

        names = make([]string, 0, size) // Empty with room to grow.

        for n != 0 {

                // Refill the buffer if necessary

                if d.bufp >= d.nbuf {

                        d.bufp = 0

                        var errno error

                        d.nbuf, errno = syscall.ReadDirent(f.fd, d.buf)

                        if errno != nil {

                                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], n, names)

                d.bufp += nb

                n -= nc

        }

        if n >= 0 && len(names) == 0 {

                return names, io.EOF

        }

        return names, nil

}