// Copyright 2018 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,!arm,!arm64 dragonfly freebsd netbsd openbsd
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package syscall_test
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import (
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"bytes"
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"io/ioutil"
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"os"
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"path/filepath"
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"sort"
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"strconv"
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"strings"
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"syscall"
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"testing"
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)
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func TestDirent(t *testing.T) {
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const (
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direntBufSize = 2048
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filenameMinSize = 11
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)
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d, err := ioutil.TempDir("", "dirent-test")
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if err != nil {
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t.Fatalf("tempdir: %v", err)
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}
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defer os.RemoveAll(d)
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t.Logf("tmpdir: %s", d)
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for i, c := range []byte("0123456789") {
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name := string(bytes.Repeat([]byte{c}, filenameMinSize+i))
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err = ioutil.WriteFile(filepath.Join(d, name), nil, 0644)
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if err != nil {
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t.Fatalf("writefile: %v", err)
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}
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}
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buf := bytes.Repeat([]byte("DEADBEAF"), direntBufSize/8)
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fd, err := syscall.Open(d, syscall.O_RDONLY, 0)
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defer syscall.Close(fd)
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if err != nil {
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t.Fatalf("syscall.open: %v", err)
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}
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n, err := syscall.ReadDirent(fd, buf)
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if err != nil {
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t.Fatalf("syscall.readdir: %v", err)
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}
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buf = buf[:n]
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names := make([]string, 0, 10)
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for len(buf) > 0 {
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var bc int
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bc, _, names = syscall.ParseDirent(buf, -1, names)
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buf = buf[bc:]
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}
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sort.Strings(names)
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t.Logf("names: %q", names)
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if len(names) != 10 {
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t.Errorf("got %d names; expected 10", len(names))
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}
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for i, name := range names {
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ord, err := strconv.Atoi(name[:1])
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if err != nil {
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t.Fatalf("names[%d] is non-integer %q: %v", i, names[i], err)
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}
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if expected := string(strings.Repeat(name[:1], filenameMinSize+ord)); name != expected {
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t.Errorf("names[%d] is %q (len %d); expected %q (len %d)", i, name, len(name), expected, len(expected))
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}
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}
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}
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