Fixes from PR

- is_ebadf always returns false

Signed-off-by: Ayush Singh <ayushdevel1325@gmail.com>

library/std/src/sys/uefi/stdio.rs

@@ -33,18 +33,17 @@ impl io::Read for Stdin {
         }
 
         // Try reading any pending data
-        let inp = read(stdin)?;
+        let inp = simple_text_input_read(stdin)?;
 
         // Check if the key is printiable character
         if inp == 0x00 {
             return Err(io::const_io_error!(io::ErrorKind::Interrupted, "Special Key Press"));
         }
 
-        // The option unwrap is safe since iterator will have 1 element.
-        let ch: char = char::decode_utf16([inp])
-            .next()
-            .unwrap()
-            .map_err(|_| io::const_io_error!(io::ErrorKind::InvalidInput, "Invalid Input"))?;
+        let Some(Ok(ch)) = char::decode_utf16([inp]).next() else {
+            return Err(io::const_io_error!(io::ErrorKind::InvalidInput, "Invalid Input"));
+        };
+
         if ch.len_utf8() > buf.len() {
             self.pending = Some(ch);
             return Ok(0);
@@ -97,8 +96,8 @@ impl io::Write for Stderr {
 // UCS-2 character should occupy 3 bytes at most in UTF-8
 pub const STDIN_BUF_SIZE: usize = 3;
 
-pub fn is_ebadf(err: &io::Error) -> bool {
-    err.raw_os_error() == Some(r_efi::efi::Status::UNSUPPORTED.as_usize())
+pub fn is_ebadf(_err: &io::Error) -> bool {
+    false
 }
 
 pub fn panic_output() -> Option<impl io::Write> {
@@ -116,6 +115,7 @@ fn write(
     };
 
     let mut utf16: Vec<u16> = utf8.encode_utf16().collect();
+    // NULL terminate the string
     utf16.push(0);
 
     unsafe { simple_text_output(protocol, &mut utf16) }?;
@@ -131,7 +131,9 @@ unsafe fn simple_text_output(
     if res.is_error() { Err(io::Error::from_raw_os_error(res.as_usize())) } else { Ok(()) }
 }
 
-fn read(stdin: *mut r_efi::protocols::simple_text_input::Protocol) -> io::Result<u16> {
+fn simple_text_input_read(
+    stdin: *mut r_efi::protocols::simple_text_input::Protocol,
+) -> io::Result<u16> {
     loop {
         match read_key_stroke(stdin) {
             Ok(x) => return Ok(x.unicode_char),