1 files changed, 93 insertions, 0 deletions
diff --git a/library/std/src/sys/hermit/args.rs b/library/std/src/sys/hermit/args.rs
new file mode 100644
index 00000000000..72c1b8511ca
--- /dev/null
+++ b/library/std/src/sys/hermit/args.rs
@@ -0,0 +1,93 @@
+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 super::Args;
+    use crate::ffi::{CStr, OsString};
+    use crate::marker::PhantomData;
+    use crate::ptr;
+    use crate::sys_common::os_str_bytes::*;
+
+    use crate::sys_common::mutex::Mutex;
+
+    static mut ARGC: isize = 0;
+    static mut ARGV: *const *const u8 = ptr::null();
+    static LOCK: Mutex = Mutex::new();
+
+    pub unsafe fn init(argc: isize, argv: *const *const u8) {
+        let _guard = LOCK.lock();
+        ARGC = argc;
+        ARGV = argv;
+    }
+
+    pub unsafe fn cleanup() {
+        let _guard = LOCK.lock();
+        ARGC = 0;
+        ARGV = ptr::null();
+    }
+
+    pub fn args() -> Args {
+        Args { iter: clone().into_iter(), _dont_send_or_sync_me: PhantomData }
+    }
+
+    fn clone() -> Vec<OsString> {
+        unsafe {
+            let _guard = LOCK.lock();
+            (0..ARGC)
+                .map(|i| {
+                    let cstr = CStr::from_ptr(*ARGV.offset(i) as *const i8);
+                    OsStringExt::from_vec(cstr.to_bytes().to_vec())
+                })
+                .collect()
+        }
+    }
+}