// 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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// +build aix darwin,!arm,!arm64 dragonfly freebsd js,wasm linux nacl netbsd openbsd solaris
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package os
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import (
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"io"
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"runtime"
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"syscall"
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)
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// Auxiliary information if the File describes a directory
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type dirInfo struct {
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buf []byte // buffer for directory I/O
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nbuf int // length of buf; return value from Getdirentries
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bufp int // location of next record in buf.
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}
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const (
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// More than 5760 to work around https://golang.org/issue/24015.
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blockSize = 8192
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)
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func (d *dirInfo) close() {}
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func (f *File) readdirnames(n int) (names []string, err error) {
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// If this file has no dirinfo, create one.
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if f.dirinfo == nil {
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f.dirinfo = new(dirInfo)
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// The buffer must be at least a block long.
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f.dirinfo.buf = make([]byte, blockSize)
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}
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d := f.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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names = make([]string, 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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d.bufp = 0
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var errno error
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d.nbuf, errno = f.pfd.ReadDirent(d.buf)
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runtime.KeepAlive(f)
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if errno != nil {
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return names, wrapSyscallError("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], n, names)
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d.bufp += nb
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n -= nc
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}
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if n >= 0 && len(names) == 0 {
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return names, io.EOF
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}
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return names, nil
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}
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