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use core::slice;
use gentoo_utils::{
Parseable,
atom::{Atom, Version},
};
use mon::{Parser, ParserFinishedError, input::InputIter};
use std::{
cmp::Ordering,
io::{BufRead, BufReader, Write},
process::{ChildStdin, ChildStdout, Command, Stdio},
sync::{LazyLock, Mutex},
};
struct PyProcess {
stdin: Mutex<ChildStdin>,
stdout: Mutex<BufReader<ChildStdout>>,
buffer: Mutex<String>,
}
#[allow(clippy::missing_safety_doc, clippy::needless_return)]
#[unsafe(no_mangle)]
pub unsafe extern "C" fn LLVMFuzzerTestOneInput(input: *const u8, len: usize) -> i32 {
static PY_PROCESS: LazyLock<PyProcess> = LazyLock::new(|| {
#[allow(clippy::zombie_processes)]
let mut proc = Command::new("vercmp.py")
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::inherit())
.spawn()
.expect("failed to spawn vercmp.py");
let stdin = Mutex::new(proc.stdin.take().unwrap());
let stdout = Mutex::new(BufReader::new(proc.stdout.take().unwrap()));
PyProcess {
stdin,
stdout,
buffer: Mutex::new(String::new()),
}
});
let control = Version::parser()
.parse_finished(InputIter::new("1.2.0a_alpha1_beta2-r1-8"))
.unwrap();
let slice = unsafe { slice::from_raw_parts(input, len) };
if slice.iter().any(|b| !b.is_ascii_graphic()) {
return -1;
}
let str = match str::from_utf8(slice) {
Ok(str) => str,
Err(_) => return -1,
};
let version_str = match str.split_ascii_whitespace().nth(0) {
Some(lhs) => lhs,
None => return -1,
};
dbg!(version_str);
let version = match Version::parser().parse_finished(InputIter::new(version_str)) {
Ok(a) => a,
Err(_) => return -1,
};
let gentoo_utils = control.cmp(&version);
let portage_result = portage_vercmp(&PY_PROCESS, &control, &version);
match portage_result {
Ok(portage) if portage == gentoo_utils => {
eprintln!("agreement on {control} cmp {version} == {portage:?}");
}
Ok(portage) => {
panic!(
"disagreement on {control} == {version}:\nportage:{portage:?} gentoo_utils:{gentoo_utils:?}"
)
}
Err(_) => {
panic!("parsed invalid versions: {control} | {version}")
}
}
return 0;
}
fn portage_vercmp(pyproc: &PyProcess, a: &Version, b: &Version) -> Result<Ordering, ()> {
let mut stdin = pyproc.stdin.lock().expect("failed to get stdin lock");
let mut stdout = pyproc.stdout.lock().expect("failed to get stdout lock");
let mut buffer = pyproc.buffer.lock().expect("failed to get buffer lock");
writeln!(&mut stdin, "{a} {b}").expect("failed to write line to python process");
stdin.flush().unwrap();
buffer.clear();
stdout
.read_line(&mut buffer)
.expect("failed to read line from python process");
match buffer.as_str().trim() {
"0" => Ok(Ordering::Equal),
"1" => Ok(Ordering::Greater),
"-1" => Ok(Ordering::Less),
"err" => Err(()),
other => panic!("unexpected result from python: {other}"),
}
}
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