unix.rs
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unix.rs
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	use std::ffi::{CStr, OsString};
	use std::os::unix::prelude::OsStringExt;

	pub struct Vars {
	inner: std::vec::IntoIter<OsString>,
	}

	impl Iterator for Vars {
	type Item = String;
	fn next(&mut self) -> Option<String> { self.inner.next().map(\|var\| var.into_string().unwrap()) }
	fn size_hint(&self) -> (usize, Option<usize>) { self.inner.size_hint() }
	}

	#[cfg(target_os = "macos")]
	unsafe fn environ() -> mut const const libc::c_char { libc::_NSGetEnviron() as mut const const libc::c_char }

	#[cfg(not(target_os = "macos"))]
	unsafe fn environ() -> mut const *const libc::c_char {
	extern "C" {
	static mut environ: const const libc::c_char;
	}
	std::ptr::addr_of_mut!(environ)
	}

	pub fn env() -> Vec<String> {
	unsafe {
	let mut environ = *environ();
	let mut result = Vec::new();

	if !environ.is_null() {
	while !(*environ).is_null() {
	if let Some(key_value) = parse(CStr::from_ptr(*environ).to_bytes()) {
	result.push(key_value);
	}
	environ = environ.add(1);
	}
	}

	return Vars { inner: result.into_iter() }.collect();
	}

	fn parse(input: &[u8]) -> Option<OsString> {
	if input.is_empty() {
	return None;
	}
	Some(OsString::from_vec(input.to_vec()))
	}
	}