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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use ffi::OsString;
use super::abi::usercalls::{copy_user_buffer, alloc, ByteBuffer};
use sync::atomic::{AtomicUsize, Ordering};
use sys::os_str::Buf;
use sys_common::FromInner;
use slice;
static ARGS: AtomicUsize = AtomicUsize::new(0);
type ArgsStore = Vec<OsString>;
pub unsafe fn init(argc: isize, argv: *const *const u8) {
if argc != 0 {
let args = alloc::User::<[ByteBuffer]>::from_raw_parts(argv as _, argc as _);
let args = args.iter()
.map( |a| OsString::from_inner(Buf { inner: copy_user_buffer(a) }) )
.collect::<ArgsStore>();
ARGS.store(Box::into_raw(Box::new(args)) as _, Ordering::Relaxed);
}
}
pub unsafe fn cleanup() {
let args = ARGS.swap(0, Ordering::Relaxed);
if args != 0 {
drop(Box::<ArgsStore>::from_raw(args as _))
}
}
pub fn args() -> Args {
let args = unsafe { (ARGS.load(Ordering::Relaxed) as *const ArgsStore).as_ref() };
if let Some(args) = args {
Args(args.iter())
} else {
Args([].iter())
}
}
pub struct Args(slice::Iter<'static, OsString>);
impl Args {
pub fn inner_debug(&self) -> &[OsString] {
self.0.as_slice()
}
}
impl Iterator for Args {
type Item = OsString;
fn next(&mut self) -> Option<OsString> {
self.0.next().cloned()
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.0.size_hint()
}
}
impl ExactSizeIterator for Args {
fn len(&self) -> usize {
self.0.len()
}
}
impl DoubleEndedIterator for Args {
fn next_back(&mut self) -> Option<OsString> {
self.0.next_back().cloned()
}
}
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