golang.org/x/sys v0.0.0-20191026070338-33540a1f6037: unix.ByteSliceFromString

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.ByteSliceFromString in pkg:golang/golang.org/x/sys@v0.0.0-20191026070338-33540a1f6037
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.0.0-20191026070338-33540a1f6037
Demonstrate these symbols/APIs:
  - golang.org/x/sys/unix.ByteSliceFromString

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:db96e83b6fe06608ca27b6ac50b68a470c9e42341f6de4276ed2e82ba23bd8bf","contract":["unix.ByteSliceFromString converts a valid non-empty string into a NUL-terminated byte slice","unix.ByteSliceFromString converts an empty string into a single NUL byte slice","unix.ByteSliceFromString returns unix.EINVAL when given a string containing an embedded NUL byte"],"goal":"verify golang.org/x/sys/unix.ByteSliceFromString in pkg:golang/golang.org/x/sys@v0.0.0-20191026070338-33540a1f6037","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.0.0-20191026070338-33540a1f6037"],"schemaVersion":1,"symbols":["golang.org/x/sys/unix.ByteSliceFromString"]},"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@v0.0.0-20191026070338-33540a1f6037"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.0.0-20191026070338-33540a1f6037","symbols":["golang.org/x/sys/unix.ByteSliceFromString"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.20

require golang.org/x/sys v0.0.0-20191026070338-33540a1f6037

golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 h1:YyJpGZS1sBuBCzLAR1VEpK193GlqGZbnPFnPV/5Rsb4=
golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.ByteSliceFromString in pkg:golang/golang.org/x/sys@v0.0.0-20191026070338-33540a1f6037",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.0.0-20191026070338-33540a1f6037"
  ],
  "symbols": [
    "golang.org/x/sys/unix.ByteSliceFromString"
  ]
}

package main

import (
	"bytes"
	"fmt"
	"os"

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

func main() {
	b, err := unix.ByteSliceFromString("hello")
	if err != nil {
		fmt.Fprintf(os.Stderr, "unexpected error for valid string: %v\n", err)
		os.Exit(1)
	}
	if !bytes.Equal(b, []byte{'h', 'e', 'l', 'l', 'o', 0}) {
		fmt.Fprintf(os.Stderr, "unexpected slice: %v\n", b)
		os.Exit(1)
	}

	empty, err := unix.ByteSliceFromString("")
	if err != nil {
		fmt.Fprintf(os.Stderr, "unexpected error for empty string: %v\n", err)
		os.Exit(1)
	}
	if !bytes.Equal(empty, []byte{0}) {
		fmt.Fprintf(os.Stderr, "unexpected slice for empty string: %v\n", empty)
		os.Exit(1)
	}

	_, err = unix.ByteSliceFromString("hel\x00lo")
	if err != unix.EINVAL {
		fmt.Fprintf(os.Stderr, "expected EINVAL for embedded NUL, got: %v\n", err)
		os.Exit(1)
	}
}