golang.org/x/sys v0.23.0: 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@v0.23.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/sys@v0.23.0
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:sha256:04a58bd78e405726c373a95b8584c2ca7ee25234fcffd2f7bb5c6dc8681bba0d","contract":["unix.ByteSliceFromString converts a non-empty string into a NUL-terminated byte slice","unix.ByteSliceFromString converts an empty string into a single NUL byte slice","unix.ByteSliceFromString rejects a string containing an embedded NUL byte with unix.EINVAL"],"goal":"verify golang.org/x/sys/unix.ByteSliceFromString in pkg:golang/golang.org/x/sys@v0.23.0","kind":"HOW","packages":["pkg:golang/golang.org/x/sys@v0.23.0"],"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@v0.23.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/sys@v0.23.0","symbols":["golang.org/x/sys/unix.ByteSliceFromString"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.22.0

require golang.org/x/sys v0.23.0

golang.org/x/sys v0.23.0 h1:YfKFowiIMvtgl1UERQoTPPToxltDeZfbj4H7dVUCwmM=
golang.org/x/sys v0.23.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

package main

import (
	"fmt"

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

func main() {
	b, err := unix.ByteSliceFromString("example")
	if err != nil {
		fmt.Printf("error: %v\n", err)
		return
	}
	fmt.Printf("length: %d\n", len(b))
}

{
  "schemaVersion": 1,
  "goal": "verify golang.org/x/sys/unix.ByteSliceFromString in pkg:golang/golang.org/x/sys@v0.23.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/sys@v0.23.0"
  ],
  "symbols": [
    "golang.org/x/sys/unix.ByteSliceFromString"
  ]
}

package main

import (
	"bytes"
	"fmt"
	"os"

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

func main() {
	s, err := unix.ByteSliceFromString("unix")
	if err != nil {
		fmt.Fprintf(os.Stderr, "unexpected error: %v\n", err)
		os.Exit(1)
	}
	if !bytes.Equal(s, []byte{'u', 'n', 'i', 'x', 0}) {
		fmt.Fprintf(os.Stderr, "unexpected byte slice: %v\n", s)
		os.Exit(1)
	}

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

	invalid, err := unix.ByteSliceFromString("a\x00b")
	if err != unix.EINVAL || invalid != nil {
		fmt.Fprintf(os.Stderr, "expected EINVAL and nil slice, got %v and %v\n", err, invalid)
		os.Exit(1)
	}
}