blob: e5b8357af70a185b3da8004994cf5ccb84062231 [file] [log] [blame]
// Copyright 2018 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 netbsd openbsd
package syscall_test
import (
"bytes"
"io/ioutil"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
"syscall"
"testing"
)
func TestDirent(t *testing.T) {
const (
direntBufSize = 2048
filenameMinSize = 11
)
d, err := ioutil.TempDir("", "dirent-test")
if err != nil {
t.Fatalf("tempdir: %v", err)
}
defer os.RemoveAll(d)
t.Logf("tmpdir: %s", d)
for i, c := range []byte("0123456789") {
name := string(bytes.Repeat([]byte{c}, filenameMinSize+i))
err = ioutil.WriteFile(filepath.Join(d, name), nil, 0644)
if err != nil {
t.Fatalf("writefile: %v", err)
}
}
buf := bytes.Repeat([]byte("DEADBEAF"), direntBufSize/8)
fd, err := syscall.Open(d, syscall.O_RDONLY, 0)
defer syscall.Close(fd)
if err != nil {
t.Fatalf("syscall.open: %v", err)
}
n, err := syscall.ReadDirent(fd, buf)
if err != nil {
t.Fatalf("syscall.readdir: %v", err)
}
buf = buf[:n]
names := make([]string, 0, 10)
for len(buf) > 0 {
var bc int
bc, _, names = syscall.ParseDirent(buf, -1, names)
buf = buf[bc:]
}
sort.Strings(names)
t.Logf("names: %q", names)
if len(names) != 10 {
t.Errorf("got %d names; expected 10", len(names))
}
for i, name := range names {
ord, err := strconv.Atoi(name[:1])
if err != nil {
t.Fatalf("names[%d] is non-integer %q: %v", i, names[i], err)
}
if expected := string(strings.Repeat(name[:1], filenameMinSize+ord)); name != expected {
t.Errorf("names[%d] is %q (len %d); expected %q (len %d)", i, name, len(name), expected, len(expected))
}
}
}