mirror of
https://github.com/autc04/Retro68.git
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85 lines
2.1 KiB
Go
85 lines
2.1 KiB
Go
// Copyright 2019 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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//go:build darwin || freebsd || netbsd || openbsd
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package syscall_test
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import (
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"fmt"
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"os"
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"path/filepath"
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"sort"
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"strings"
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"syscall"
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"testing"
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"unsafe"
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)
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func TestGetdirentries(t *testing.T) {
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for _, count := range []int{10, 1000} {
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t.Run(fmt.Sprintf("n=%d", count), func(t *testing.T) {
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testGetdirentries(t, count)
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})
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}
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}
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func testGetdirentries(t *testing.T, count int) {
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if count > 100 && testing.Short() && os.Getenv("GO_BUILDER_NAME") == "" {
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t.Skip("skipping in -short mode")
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}
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d := t.TempDir()
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var names []string
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for i := 0; i < count; i++ {
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names = append(names, fmt.Sprintf("file%03d", i))
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}
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// Make files in the temp directory
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for _, name := range names {
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err := os.WriteFile(filepath.Join(d, name), []byte("data"), 0)
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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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// Read files using Getdirentries
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var names2 []string
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fd, err := syscall.Open(d, syscall.O_RDONLY, 0)
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if err != nil {
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t.Fatalf("Open: %v", err)
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}
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defer syscall.Close(fd)
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var base uintptr
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var buf [2048]byte
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for {
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n, err := syscall.Getdirentries(fd, buf[:], &base)
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if err != nil {
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t.Fatalf("Getdirentries: %v", err)
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}
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if n == 0 {
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break
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}
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data := buf[:n]
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for len(data) > 0 {
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// If multiple Dirents are written into buf, sometimes when we reach the final one,
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// we have cap(buf) < Sizeof(Dirent). So use an appropriate slice to copy from data.
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var dirent syscall.Dirent
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copy((*[unsafe.Sizeof(dirent)]byte)(unsafe.Pointer(&dirent))[:], data)
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data = data[dirent.Reclen:]
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name := make([]byte, dirent.Namlen)
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for i := 0; i < int(dirent.Namlen); i++ {
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name[i] = byte(dirent.Name[i])
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}
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names2 = append(names2, string(name))
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}
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}
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names = append(names, ".", "..") // Getdirentries returns these also
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sort.Strings(names)
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sort.Strings(names2)
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if strings.Join(names, ":") != strings.Join(names2, ":") {
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t.Errorf("names don't match\n names: %q\nnames2: %q", names, names2)
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}
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}
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