golang.org/x/sys v0.0.0-20210510120138-977fb7262007: unix.ByteSliceToString

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify golang.org/x/sys/unix.ByteSliceToString in pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.ByteSliceToString

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:bd7f9c91bdb80998a101e4761749d3bb4a7866e13e6283e624a0fae2d3f4b60d","contract":["unix.ByteSliceToString converts null-terminated byte slice to string terminating at first NUL byte","unix.ByteSliceToString converts byte slice without NUL terminator to full string","unix.ByteSliceToString returns empty string for byte slice starting with NUL byte","unix.ByteSliceToString returns empty string for empty or nil byte slice"],"goal":"verify golang.org/x/sys/unix.ByteSliceToString in pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.ByteSliceToString"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007","symbols":["golang.org/x/sys/unix.ByteSliceToString"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.20

require golang.org/x/sys v0.0.0-20210510120138-977fb7262007

golang.org/x/sys v0.0.0-20210510120138-977fb7262007 h1:gG67DSER+11cZvqIMb8S8bt0vZtiN6xWYARwirrOSfE=
golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

package main

import (
	"fmt"

	"golang.org/x/sys/unix"
)

func main() {
	buf := []byte{'h', 'e', 'l', 'l', 'o', 0, 'w', 'o', 'r', 'l', 'd'}
	str := unix.ByteSliceToString(buf)
	fmt.Printf("Converted string: %q\n", str)
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.ByteSliceToString in pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.0.0-20210510120138-977fb7262007"
  ],
  "symbols": [
    "golang.org/x/sys/unix.ByteSliceToString"
  ]
}

package main

import (
	"fmt"
	"os"

	"golang.org/x/sys/unix"
)

func main() {
	if err := runTests(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract test failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All contract assertions passed.")
}

func runTests() error {
	// 1. unix.ByteSliceToString converts null-terminated byte slice to string terminating at first NUL byte
	nulTerminated := []byte{'h', 'e', 'l', 'l', 'o', 0, 'w', 'o', 'r', 'l', 'd'}
	got := unix.ByteSliceToString(nulTerminated)
	if got != "hello" {
		return fmt.Errorf("expected %q, got %q", "hello", got)
	}

	// 2. unix.ByteSliceToString converts byte slice without NUL terminator to full string
	noNul := []byte{'h', 'e', 'l', 'l', 'o'}
	got = unix.ByteSliceToString(noNul)
	if got != "hello" {
		return fmt.Errorf("expected %q, got %q", "hello", got)
	}

	// 3. unix.ByteSliceToString returns empty string for byte slice starting with NUL byte
	startWithNul := []byte{0, 'h', 'e', 'l', 'l', 'o'}
	got = unix.ByteSliceToString(startWithNul)
	if got != "" {
		return fmt.Errorf("expected empty string, got %q", got)
	}

	// 4. unix.ByteSliceToString returns empty string for empty or nil byte slice
	emptySlice := []byte{}
	gotEmpty := unix.ByteSliceToString(emptySlice)
	if gotEmpty != "" {
		return fmt.Errorf("expected empty string for empty slice, got %q", gotEmpty)
	}

	var nilSlice []byte
	gotNil := unix.ByteSliceToString(nilSlice)
	if gotNil != "" {
		return fmt.Errorf("expected empty string for nil slice, got %q", gotNil)
	}

	return nil
}