55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
// 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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"syscall"
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)
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const (
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blockSize = 4096
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)
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// Readdirnames reads the contents of the directory associated with file and
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// returns an array of up to count names, in directory order. Subsequent
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// calls on the same file will yield further names.
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// A negative count means to read until EOF.
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// Readdirnames returns the array and an Error, if any.
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func (file *File) Readdirnames(count int) (names []string, err 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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// The buffer must be at least a block long.
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file.dirinfo.buf = make([]byte, blockSize)
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}
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d := file.dirinfo
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size := count
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if size < 0 {
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size = 100
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}
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names = make([]string, 0, size) // Empty with room to grow.
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for count != 0 {
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// Refill the buffer if necessary
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if d.bufp >= d.nbuf {
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d.bufp = 0
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var errno int
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d.nbuf, errno = syscall.ReadDirent(file.fd, d.buf)
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if errno != 0 {
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return names, NewSyscallError("readdirent", errno)
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}
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if d.nbuf <= 0 {
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break // EOF
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}
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}
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// Drain the buffer
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var nb, nc int
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nb, nc, names = syscall.ParseDirent(d.buf[d.bufp:d.nbuf], count, names)
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d.bufp += nb
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count -= nc
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}
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return names, nil
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}
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