| // 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 dragonfly freebsd linux nacl netbsd openbsd solaris |
| |
| 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 |
| } |