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