// 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 darwin
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// +build arm arm64
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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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"unsafe"
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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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dir uintptr // Pointer to DIR structure from dirent.h
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}
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func (d *dirInfo) close() {
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if d.dir == 0 {
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return
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}
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closedir(d.dir)
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d.dir = 0
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}
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func (f *File) readdirnames(n int) (names []string, err error) {
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if f.dirinfo == nil {
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dir, call, errno := f.pfd.OpenDir()
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if errno != nil {
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return nil, wrapSyscallError(call, errno)
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}
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f.dirinfo = &dirInfo{
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dir: dir,
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}
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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)
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var dirent syscall.Dirent
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var entptr uintptr
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for len(names) < size {
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if res := readdir_r(d.dir, uintptr(unsafe.Pointer(&dirent)), uintptr(unsafe.Pointer(&entptr))); res != 0 {
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return names, wrapSyscallError("readdir", syscall.Errno(res))
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}
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if entptr == 0 { // EOF
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break
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}
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if dirent.Ino == 0 {
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continue
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}
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name := (*[len(syscall.Dirent{}.Name)]byte)(unsafe.Pointer(&dirent.Name))[:]
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for i, c := range name {
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if c == 0 {
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name = name[:i]
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break
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}
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}
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// Check for useless names before allocating a string.
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if string(name) == "." || string(name) == ".." {
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continue
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}
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names = append(names, string(name))
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runtime.KeepAlive(f)
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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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// Implemented in syscall/syscall_darwin.go.
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//go:linkname closedir syscall.closedir
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func closedir(dir uintptr) (err error)
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//go:linkname readdir_r syscall.readdir_r
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func readdir_r(dir, entry, result uintptr) (res int)
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