vendor/sysinfo/src/unix/utils.rs

// Take a look at the license at the top of the repository in the LICENSE file.

use libc::c_char;

pub(crate) fn cstr_to_rust(c: *const c_char) -> Option<String> {
    cstr_to_rust_with_size(c, None)
}

pub(crate) fn cstr_to_rust_with_size(c: *const c_char, size: Option<usize>) -> Option<String> {
    if c.is_null() {
        return None;
    }
    let (mut s, max) = match size {
        Some(len) => (Vec::with_capacity(len), len as isize),
        None => (Vec::new(), isize::MAX),
    };
    let mut i = 0;
    unsafe {
        loop {
            let value = *c.offset(i) as u8;
            if value == 0 {
                break;
            }
            s.push(value);
            i += 1;
            if i >= max {
                break;
            }
        }
        String::from_utf8(s).ok()
    }
}