1 files changed, 13 insertions, 40 deletions

diff --git a/library/std/src/sys/stdio/teeos.rs b/library/std/src/sys/stdio/teeos.rs
index 67e251812da..27b3292bf8f 100644
--- a/library/std/src/sys/stdio/teeos.rs
+++ b/library/std/src/sys/stdio/teeos.rs
@@ -1,12 +1,16 @@
 #![deny(unsafe_op_in_unsafe_fn)]
 
+#[expect(dead_code)]
+#[path = "unsupported.rs"]
+mod unsupported_stdio;
+
 use core::arch::asm;
 
 use crate::io;
 
-pub struct Stdin;
+pub type Stdin = unsupported_stdio::Stdin;
 pub struct Stdout;
-pub struct Stderr;
+pub type Stderr = Stdout;
 
 const KCALL_DEBUG_CMD_PUT_BYTES: i64 = 2;
 
@@ -25,27 +29,6 @@ unsafe fn debug_call(cap_ref: u64, call_no: i64, arg1: u64, arg2: u64) -> i32 {
     ret as i32
 }
 
-fn print_buf(s: &[u8]) -> io::Result<usize> {
-    // Corresponds to `HM_DEBUG_PUT_BYTES_LIMIT`.
-    const MAX_LEN: usize = 512;
-    let len = if s.len() > MAX_LEN { MAX_LEN } else { s.len() };
-    let result = unsafe { debug_call(0, KCALL_DEBUG_CMD_PUT_BYTES, s.as_ptr() as u64, len as u64) };
-
-    if result == 0 { Ok(len) } else { Err(io::Error::from(io::ErrorKind::InvalidInput)) }
-}
-
-impl Stdin {
-    pub const fn new() -> Stdin {
-        Stdin
-    }
-}
-
-impl io::Read for Stdin {
-    fn read(&mut self, _buf: &mut [u8]) -> io::Result<usize> {
-        Ok(0)
-    }
-}
-
 impl Stdout {
     pub const fn new() -> Stdout {
         Stdout
@@ -54,23 +37,13 @@ impl Stdout {
 
 impl io::Write for Stdout {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        print_buf(buf)
-    }
-
-    fn flush(&mut self) -> io::Result<()> {
-        Ok(())
-    }
-}
+        // Corresponds to `HM_DEBUG_PUT_BYTES_LIMIT`.
+        const MAX_LEN: usize = 512;
+        let len = buf.len().min(MAX_LEN);
+        let result =
+            unsafe { debug_call(0, KCALL_DEBUG_CMD_PUT_BYTES, buf.as_ptr() as u64, len as u64) };
 
-impl Stderr {
-    pub const fn new() -> Stderr {
-        Stderr
-    }
-}
-
-impl io::Write for Stderr {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        print_buf(buf)
+        if result == 0 { Ok(len) } else { Err(io::Error::from(io::ErrorKind::InvalidInput)) }
     }
 
     fn flush(&mut self) -> io::Result<()> {
@@ -78,7 +51,7 @@ impl io::Write for Stderr {
     }
 }
 
-pub const STDIN_BUF_SIZE: usize = 0;
+pub const STDIN_BUF_SIZE: usize = unsupported_stdio::STDIN_BUF_SIZE;
 
 pub fn is_ebadf(err: &io::Error) -> bool {
     err.raw_os_error() == Some(libc::EBADF as i32)