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