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use crate::ffi::CStr;
use crate::io;
use crate::sys::cvt_wasi;
use crate::ffi::OsString;
use crate::marker::PhantomData;
use crate::os::wasi::ffi::OsStringExt;
use crate::vec;
pub unsafe fn init(_argc: isize, _argv: *const *const u8) {
}
pub unsafe fn cleanup() {
}
pub struct Args {
iter: vec::IntoIter<OsString>,
_dont_send_or_sync_me: PhantomData<*mut ()>,
}
/// Returns the command line arguments
pub fn args() -> Args {
maybe_args().unwrap_or_else(|_| {
Args {
iter: Vec::new().into_iter(),
_dont_send_or_sync_me: PhantomData
}
})
}
fn maybe_args() -> io::Result<Args> {
unsafe {
let (mut argc, mut argv_buf_size) = (0, 0);
cvt_wasi(libc::__wasi_args_sizes_get(&mut argc, &mut argv_buf_size))?;
let mut argc = vec![0 as *mut libc::c_char; argc];
let mut argv_buf = vec![0; argv_buf_size];
cvt_wasi(libc::__wasi_args_get(argc.as_mut_ptr(), argv_buf.as_mut_ptr()))?;
let args = argc.into_iter()
.map(|ptr| CStr::from_ptr(ptr).to_bytes().to_vec())
.map(|bytes| OsString::from_vec(bytes))
.collect::<Vec<_>>();
Ok(Args {
iter: args.into_iter(),
_dont_send_or_sync_me: PhantomData,
})
}
}
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()
}
}
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