libc 0.2.189

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4

[[package]]
name = "libc"
version = "0.2.189"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3eaf3ede3fee6db1a4c2ee091bf8a8b4dccdc6d17f656fb07896ee72867612f2"

[[package]]
name = "sample-libc"
version = "1.0.0"
dependencies = [
 "libc",
]

[package]
name = "sample-libc"
version = "1.0.0"
edition = "2021"
publish = false

[dependencies]
libc = "=0.2.189"

[[bin]]
name = "contract"
path = "test/contract.rs"

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 pkg:cargo/libc@0.2.189
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/libc@0.2.189

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:sha256:9574d6cb2018a057a54afad64ae8a8f4b4379392191c0632dbb607b16b6e72e9","contract":["libc::getpid returns positive process identifier","libc::strlen returns correct length of null-terminated byte string","libc::abs computes absolute value of integers","libc::isdigit correctly classifies ASCII digits","libc::strcmp compares null-terminated byte strings"],"goal":"verify pkg:cargo/libc@0.2.189","kind":"HOW","packages":["pkg:cargo/libc@0.2.189"],"schemaVersion":1},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","distro":"alpine","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/libc@0.2.189"],"schemaVersion":1,"subject":"pkg:cargo/libc@0.2.189","verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify pkg:cargo/libc@0.2.189",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/libc@0.2.189"
  ]
}

//! Clean-room verification sample for libc.

pub use libc::*;

use std::ffi::CString;

fn main() {
    // 1. libc::getpid returns positive process identifier
    let pid = unsafe { libc::getpid() };
    assert!(pid > 0, "PID should be positive");

    // 2. libc::strlen returns correct length of null-terminated byte string
    let c_str = CString::new("hello world").expect("valid CString");
    let len = unsafe { libc::strlen(c_str.as_ptr()) };
    assert_eq!(len, 11);

    // 3. libc::abs computes absolute value of integers
    let neg: libc::c_int = -42;
    let pos = unsafe { libc::abs(neg) };
    assert_eq!(pos, 42);

    // 4. libc::isdigit correctly classifies ASCII digits
    let is_digit = unsafe { libc::isdigit(b'5' as libc::c_int) };
    assert_ne!(is_digit, 0);
    let not_digit = unsafe { libc::isdigit(b'a' as libc::c_int) };
    assert_eq!(not_digit, 0);

    // 5. libc::strcmp compares null-terminated byte strings
    let str1 = CString::new("abc").unwrap();
    let str2 = CString::new("abc").unwrap();
    let str3 = CString::new("abd").unwrap();
    assert_eq!(unsafe { libc::strcmp(str1.as_ptr(), str2.as_ptr()) }, 0);
    assert!(unsafe { libc::strcmp(str1.as_ptr(), str3.as_ptr()) } < 0);

    println!("All libc contract assertions passed successfully.");
}