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#![deny(unsafe_op_in_unsafe_fn)]
use crate::ffi::{CStr, OsStr, OsString};
use crate::fmt;
use crate::os::wasi::ffi::OsStrExt;
use crate::vec;
pub struct Args {
iter: vec::IntoIter<OsString>,
}
impl !Send for Args {}
impl !Sync for Args {}
/// Returns the command line arguments
pub fn args() -> Args {
Args { iter: maybe_args().unwrap_or(Vec::new()).into_iter() }
}
fn maybe_args() -> Option<Vec<OsString>> {
unsafe {
let (argc, buf_size) = wasi::args_sizes_get().ok()?;
let mut argv = Vec::with_capacity(argc);
let mut buf = Vec::with_capacity(buf_size);
wasi::args_get(argv.as_mut_ptr(), buf.as_mut_ptr()).ok()?;
argv.set_len(argc);
let mut ret = Vec::with_capacity(argc);
for ptr in argv {
let s = CStr::from_ptr(ptr.cast());
ret.push(OsStr::from_bytes(s.to_bytes()).to_owned());
}
Some(ret)
}
}
impl fmt::Debug for Args {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.iter.as_slice().fmt(f)
}
}
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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