111 lines
3 KiB
Rust
111 lines
3 KiB
Rust
// Copyright 2016 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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//! Global initialization and retrieval of command line arguments.
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//!
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//! On some platforms these are stored during runtime startup,
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//! and on some they are retrieved from the system on demand.
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#![allow(dead_code)] // runtime init functions not used during testing
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use ffi::OsString;
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use marker::PhantomData;
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use vec;
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/// One-time global initialization.
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pub unsafe fn init(argc: isize, argv: *const *const u8) { imp::init(argc, argv) }
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/// One-time global cleanup.
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pub unsafe fn cleanup() { imp::cleanup() }
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/// Returns the command line arguments
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pub fn args() -> Args {
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imp::args()
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}
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pub struct Args {
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iter: vec::IntoIter<OsString>,
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_dont_send_or_sync_me: PhantomData<*mut ()>,
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}
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impl Args {
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pub fn inner_debug(&self) -> &[OsString] {
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self.iter.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> { self.iter.next() }
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fn size_hint(&self) -> (usize, Option<usize>) { self.iter.size_hint() }
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}
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impl ExactSizeIterator for Args {
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fn len(&self) -> usize { self.iter.len() }
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}
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impl DoubleEndedIterator for Args {
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fn next_back(&mut self) -> Option<OsString> { self.iter.next_back() }
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}
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mod imp {
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use os::unix::prelude::*;
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use mem;
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use ffi::{CStr, OsString};
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use marker::PhantomData;
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use libc;
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use super::Args;
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use sys_common::mutex::Mutex;
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static mut GLOBAL_ARGS_PTR: usize = 0;
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static LOCK: Mutex = Mutex::new();
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pub unsafe fn init(argc: isize, argv: *const *const u8) {
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let args = (0..argc).map(|i| {
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CStr::from_ptr(*argv.offset(i) as *const libc::c_char).to_bytes().to_vec()
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}).collect();
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LOCK.lock();
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let ptr = get_global_ptr();
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assert!((*ptr).is_none());
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(*ptr) = Some(box args);
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LOCK.unlock();
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}
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pub unsafe fn cleanup() {
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LOCK.lock();
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*get_global_ptr() = None;
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LOCK.unlock();
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}
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pub fn args() -> Args {
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let bytes = clone().unwrap_or(Vec::new());
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let v: Vec<OsString> = bytes.into_iter().map(|v| {
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OsStringExt::from_vec(v)
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}).collect();
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Args { iter: v.into_iter(), _dont_send_or_sync_me: PhantomData }
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}
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fn clone() -> Option<Vec<Vec<u8>>> {
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unsafe {
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LOCK.lock();
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let ptr = get_global_ptr();
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let ret = (*ptr).as_ref().map(|s| (**s).clone());
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LOCK.unlock();
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return ret
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}
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}
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fn get_global_ptr() -> *mut Option<Box<Vec<Vec<u8>>>> {
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unsafe { mem::transmute(&GLOBAL_ARGS_PTR) }
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}
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}
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