c-scape 0.22.3

A libc bottom-half implementation in Rust
Documentation 
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use core::ffi::CStr;
use rustix::fd::BorrowedFd;
use rustix::fs::AtFlags;

use libc::{c_char, c_int};

use crate::convert_res;

#[no_mangle]
unsafe extern "C" fn link(oldpath: *const c_char, newpath: *const c_char) -> c_int {
    libc!(libc::link(oldpath, newpath));

    linkat(libc::AT_FDCWD, oldpath, libc::AT_FDCWD, newpath, 0)
}

#[no_mangle]
unsafe extern "C" fn linkat(
    olddirfd: c_int,
    oldpath: *const c_char,
    newdirfd: c_int,
    newpath: *const c_char,
    flags: c_int,
) -> c_int {
    libc!(libc::linkat(olddirfd, oldpath, newdirfd, newpath, flags));

    let flags = AtFlags::from_bits(flags as _).unwrap();
    match convert_res(rustix::fs::linkat(
        BorrowedFd::borrow_raw(olddirfd),
        CStr::from_ptr(oldpath.cast()),
        BorrowedFd::borrow_raw(newdirfd),
        CStr::from_ptr(newpath.cast()),
        flags,
    )) {
        Some(()) => 0,
        None => -1,
    }
}