1 files changed, 120 insertions, 0 deletions
diff --git a/library/std/src/sys/hermit/stdio.rs b/library/std/src/sys/hermit/stdio.rs
new file mode 100644
index 00000000000..f3654ee3871
--- /dev/null
+++ b/library/std/src/sys/hermit/stdio.rs
@@ -0,0 +1,120 @@
+use crate::io;
+use crate::io::{IoSlice, IoSliceMut};
+use crate::sys::hermit::abi;
+
+pub struct Stdin;
+pub struct Stdout;
+pub struct Stderr;
+
+impl Stdin {
+    pub fn new() -> io::Result<Stdin> {
+        Ok(Stdin)
+    }
+}
+
+impl io::Read for Stdin {
+    fn read(&mut self, data: &mut [u8]) -> io::Result<usize> {
+        self.read_vectored(&mut [IoSliceMut::new(data)])
+    }
+
+    fn read_vectored(&mut self, _data: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        Ok(0)
+    }
+
+    #[inline]
+    fn is_read_vectored(&self) -> bool {
+        true
+    }
+}
+
+impl Stdout {
+    pub fn new() -> io::Result<Stdout> {
+        Ok(Stdout)
+    }
+}
+
+impl io::Write for Stdout {
+    fn write(&mut self, data: &[u8]) -> io::Result<usize> {
+        let len;
+
+        unsafe { len = abi::write(1, data.as_ptr() as *const u8, data.len()) }
+
+        if len < 0 {
+            Err(io::Error::new(io::ErrorKind::Other, "Stdout is not able to print"))
+        } else {
+            Ok(len as usize)
+        }
+    }
+
+    fn write_vectored(&mut self, data: &[IoSlice<'_>]) -> io::Result<usize> {
+        let len;
+
+        unsafe { len = abi::write(1, data.as_ptr() as *const u8, data.len()) }
+
+        if len < 0 {
+            Err(io::Error::new(io::ErrorKind::Other, "Stdout is not able to print"))
+        } else {
+            Ok(len as usize)
+        }
+    }
+
+    #[inline]
+    fn is_write_vectored(&self) -> bool {
+        true
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+impl Stderr {
+    pub fn new() -> io::Result<Stderr> {
+        Ok(Stderr)
+    }
+}
+
+impl io::Write for Stderr {
+    fn write(&mut self, data: &[u8]) -> io::Result<usize> {
+        let len;
+
+        unsafe { len = abi::write(2, data.as_ptr() as *const u8, data.len()) }
+
+        if len < 0 {
+            Err(io::Error::new(io::ErrorKind::Other, "Stderr is not able to print"))
+        } else {
+            Ok(len as usize)
+        }
+    }
+
+    fn write_vectored(&mut self, data: &[IoSlice<'_>]) -> io::Result<usize> {
+        let len;
+
+        unsafe { len = abi::write(2, data.as_ptr() as *const u8, data.len()) }
+
+        if len < 0 {
+            Err(io::Error::new(io::ErrorKind::Other, "Stderr is not able to print"))
+        } else {
+            Ok(len as usize)
+        }
+    }
+
+    #[inline]
+    fn is_write_vectored(&self) -> bool {
+        true
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+pub const STDIN_BUF_SIZE: usize = 0;
+
+pub fn is_ebadf(_err: &io::Error) -> bool {
+    true
+}
+
+pub fn panic_output() -> Option<impl io::Write> {
+    Stderr::new().ok()
+}