cap-primitives 0.4.0

Capability-oriented primitives
Documentation 
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//! `get_path` translation code for macOS derived from Rust's
//! library/std/src/sys/unix/fs.rs at revision
//! 108e90ca78f052c0c1c49c42a22c85620be19712.

use posish::fs::getpath;
use std::{fs, os::unix::ffi::OsStringExt, path::PathBuf};

pub(crate) fn file_path(file: &fs::File) -> Option<PathBuf> {
    // The use of PATH_MAX is generally not encouraged, but it
    // is inevitable in this case because macOS defines `fcntl` with
    // `F_GETPATH` in terms of `MAXPATHLEN`, and there are no
    // alternatives. If a better method is invented, it should be used
    // instead.
    let mut buf = vec![0; libc::PATH_MAX as usize];
    getpath(file, &mut buf).ok()?;
    let l = buf.iter().position(|&c| c == 0).unwrap();
    buf.truncate(l as usize);
    buf.shrink_to_fit();
    Some(PathBuf::from(std::ffi::OsString::from_vec(buf)))
}