RedBear-OS/local/archived/patches-2026-06-migration/base/P3-inputd-keymap-bridge.patch

diff --git a/drivers/inputd/src/lib.rs b/drivers/inputd/src/lib.rs
index b68e8211..eb14de51 100644
--- a/drivers/inputd/src/lib.rs
+++ b/drivers/inputd/src/lib.rs
@@ -1,5 +1,5 @@
 use std::fs::{File, OpenOptions};
-use std::io::{self, Read, Write};
+use std::io::{self, ErrorKind, Read, Write};
 use std::mem::size_of;
 use std::os::fd::{AsFd, AsRawFd, BorrowedFd, FromRawFd, RawFd};
 use std::os::unix::fs::OpenOptionsExt;
@@ -31,6 +31,24 @@ unsafe fn any_as_u8_slice_mut<T: Sized>(p: &mut T) -> &mut [u8] {
     slice::from_raw_parts_mut((p as *mut T) as *mut u8, size_of::<T>())
 }
 
+fn validate_input_name(kind: &str, name: &str) -> io::Result<()> {
+    if name.is_empty() {
+        return Err(io::Error::new(
+            io::ErrorKind::InvalidInput,
+            format!("input {kind} name must not be empty"),
+        ));
+    }
+
+    if name.contains('/') {
+        return Err(io::Error::new(
+            io::ErrorKind::InvalidInput,
+            format!("input {kind} name must not contain '/'"),
+        ));
+    }
+
+    Ok(())
+}
+
 pub struct ConsumerHandle(File);
 
 pub enum ConsumerHandleEvent<'a> {
@@ -64,25 +82,53 @@ impl ConsumerHandle {
         let fd = self.0.as_raw_fd();
         let written = libredox::call::fpath(fd as usize, &mut buffer)?;
 
-        assert!(written <= buffer.len());
+        if written > buffer.len() {
+            return Err(io::Error::new(
+                io::ErrorKind::InvalidData,
+                "inputd: display path exceeded buffer size",
+            ));
+        }
 
-        let mut display_path = PathBuf::from(
-            std::str::from_utf8(&buffer[..written])
-                .expect("init: display path UTF-8 check failed")
-                .to_owned(),
-        );
-        display_path.set_file_name(format!(
-            "v2/{}",
-            display_path.file_name().unwrap().to_str().unwrap()
-        ));
-        let display_path = display_path.to_str().unwrap();
+        let path_str = std::str::from_utf8(&buffer[..written]).map_err(|e| {
+            io::Error::new(
+                io::ErrorKind::InvalidData,
+                format!("inputd: display path is not valid UTF-8: {e}"),
+            )
+        })?;
+        let mut display_path = PathBuf::from(path_str.to_owned());
+
+        let file_name = display_path
+            .file_name()
+            .and_then(|n| n.to_str())
+            .ok_or_else(|| {
+                io::Error::new(
+                    io::ErrorKind::InvalidData,
+                    format!(
+                        "inputd: display path has no valid file name: {}",
+                        display_path.display()
+                    ),
+                )
+            })?;
+        display_path.set_file_name(format!("v2/{file_name}"));
+        let display_path_str = display_path.to_str().ok_or_else(|| {
+            io::Error::new(
+                io::ErrorKind::InvalidData,
+                format!(
+                    "inputd: constructed display path is not valid UTF-8: {}",
+                    display_path.display()
+                ),
+            )
+        })?;
 
         let display_file =
-            libredox::call::open(display_path, (O_CLOEXEC | O_NONBLOCK | O_RDWR) as _, 0)
+            libredox::call::open(display_path_str, (O_CLOEXEC | O_NONBLOCK | O_RDWR) as _, 0)
                 .map(|socket| unsafe { File::from_raw_fd(socket as RawFd) })
-                .unwrap_or_else(|err| {
-                    panic!("failed to open display {}: {}", display_path, err);
-                });
+                .map_err(|err| {
+                    io::Error::new(
+                        io::ErrorKind::Other,
+                        format!("inputd: failed to open display {display_path_str}: {err}"),
+                    )
+                })?;
 
         Ok(display_file)
     }
@@ -152,8 +198,12 @@ impl DisplayHandle {
 
         if nread == 0 {
             Ok(None)
+        } else if nread != size_of::<VtEvent>() {
+            Err(io::Error::new(
+                io::ErrorKind::InvalidData,
+                format!("inputd: partial vt event read: got {nread}, expected {}", size_of::<VtEvent>()),
+            ))
         } else {
-            assert_eq!(nread, size_of::<VtEvent>());
             Ok(Some(event))
         }
     }
@@ -197,6 +247,160 @@ pub struct VtEvent {
     pub vt: usize,
 }
 
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct HotplugEventHeader {
+    pub kind: u32,
+    pub device_id: u32,
+    pub name_len: u32,
+    pub _reserved: u32,
+}
+
+#[derive(Debug, Clone)]
+pub struct HotplugEvent {
+    pub kind: u32,
+    pub device_id: u32,
+    pub name: String,
+}
+
+/// Handle for opening a named producer on the input scheme.
+/// Opens /scheme/input/producer/{name}
+pub struct NamedProducerHandle {
+    fd: File,
+}
+
+impl NamedProducerHandle {
+    pub fn new(name: &str) -> io::Result<Self> {
+        validate_input_name("producer", name)?;
+
+        let path = format!("/scheme/input/producer/{name}");
+        File::open(path).map(|fd| Self { fd })
+    }
+
+    pub fn write_event(&mut self, event: &orbclient::Event) -> io::Result<()> {
+        self.fd.write(unsafe { any_as_u8_slice(event) })?;
+        Ok(())
+    }
+}
+
+pub struct DeviceConsumerHandle {
+    fd: File,
+}
+
+impl DeviceConsumerHandle {
+    pub fn new(device_name: &str) -> io::Result<Self> {
+        validate_input_name("device", device_name)?;
+
+        let fd = OpenOptions::new()
+            .read(true)
+            .custom_flags(O_NONBLOCK as i32)
+            .open(format!("/scheme/input/{device_name}"))?;
+
+        Ok(Self { fd })
+    }
+
+    pub fn event_handle(&self) -> BorrowedFd<'_> {
+        self.fd.as_fd()
+    }
+
+    pub fn read_event(&mut self) -> io::Result<Option<orbclient::Event>> {
+        let mut raw = [0_u8; size_of::<orbclient::Event>()];
+
+        match self.fd.read(&mut raw) {
+            Ok(0) => Ok(None),
+            Ok(read) => {
+                assert_eq!(read, raw.len());
+                Ok(Some(unsafe {
+                    core::ptr::read_unaligned(raw.as_ptr().cast::<orbclient::Event>())
+                }))
+            }
+            Err(err) if err.kind() == ErrorKind::WouldBlock => Ok(None),
+            Err(err) => Err(err),
+        }
+    }
+}
+
+pub struct HotplugHandle {
+    fd: File,
+    partial: Vec<u8>,
+}
+
+impl HotplugHandle {
+    pub fn new() -> io::Result<Self> {
+        let fd = OpenOptions::new()
+            .read(true)
+            .custom_flags(O_NONBLOCK as i32)
+            .open("/scheme/input/events")?;
+
+        Ok(Self {
+            fd,
+            partial: Vec::new(),
+        })
+    }
+
+    pub fn event_handle(&self) -> BorrowedFd<'_> {
+        self.fd.as_fd()
+    }
+
+    pub fn read_event(&mut self) -> io::Result<Option<HotplugEvent>> {
+        let mut buf = [0_u8; 1024];
+
+        loop {
+            if let Some(event) = Self::try_parse_event(&mut self.partial)? {
+                return Ok(Some(event));
+            }
+
+            match self.fd.read(&mut buf) {
+                Ok(0) => return Ok(None),
+                Ok(read) => self.partial.extend_from_slice(&buf[..read]),
+                Err(err) if err.kind() == ErrorKind::WouldBlock => return Ok(None),
+                Err(err) => return Err(err),
+            }
+        }
+    }
+
+    fn try_parse_event(partial: &mut Vec<u8>) -> io::Result<Option<HotplugEvent>> {
+        if partial.len() < size_of::<HotplugEventHeader>() {
+            return Ok(None);
+        }
+
+        let header =
+            unsafe { core::ptr::read_unaligned(partial.as_ptr().cast::<HotplugEventHeader>()) };
+        let name_len = usize::try_from(header.name_len).map_err(|_| {
+            io::Error::new(
+                io::ErrorKind::InvalidData,
+                "invalid input hotplug name length",
+            )
+        })?;
+        let total_len = size_of::<HotplugEventHeader>()
+            .checked_add(name_len)
+            .ok_or_else(|| {
+                io::Error::new(io::ErrorKind::InvalidData, "input hotplug event too large")
+            })?;
+
+        if partial.len() < total_len {
+            return Ok(None);
+        }
+
+        let name = std::str::from_utf8(&partial[size_of::<HotplugEventHeader>()..total_len])
+            .map_err(|_| {
+                io::Error::new(
+                    io::ErrorKind::InvalidData,
+                    "input hotplug name is not UTF-8",
+                )
+            })?
+            .to_owned();
+
+        partial.drain(..total_len);
+
+        Ok(Some(HotplugEvent {
+            kind: header.kind,
+            device_id: header.device_id,
+            name,
+        }))
+    }
+}
+
 pub struct ProducerHandle(File);
 
 impl ProducerHandle {
@@ -208,4 +412,58 @@ impl ProducerHandle {
         self.0.write(&event)?;
         Ok(())
     }
+
+    pub fn query_keymap_char(&self, scancode: u8, shift: bool, altgr: bool) -> Option<char> {
+        use std::io::Read;
+        let path = format!("/scheme/keymap/translate/{}/{}/{}", scancode, shift as u8, altgr as u8);
+        let mut f = match std::fs::File::open(&path) {
+            Ok(f) => f,
+            Err(_) => return None,
+        };
+        let mut buf = [0u8; 4];
+        match f.read(&mut buf) {
+            Ok(n) if n > 0 => {
+                let s = std::str::from_utf8(&buf[..n]).ok()?;
+                s.chars().next()
+            }
+            _ => None,
+        }
+    }
+
+    pub fn send_led_state(caps: bool, num: bool, scroll: bool) -> io::Result<()> {
+        let led_byte = (caps as u8) | ((num as u8) << 1) | ((scroll as u8) << 2);
+        let path = format!("/scheme/input/control/leds/{}", led_byte);
+        std::fs::write(&path, &[])?;
+        Ok(())
+    }
+}
+
+/// Convenience wrapper that tries a named producer first,
+/// falling back to the legacy anonymous producer on failure.
+pub enum InputProducer {
+    Named(NamedProducerHandle),
+    Legacy(ProducerHandle),
+}
+
+impl InputProducer {
+    /// Open a named producer (`/scheme/input/producer/{name}`).
+    /// Falls back to the legacy anonymous producer on failure.
+    pub fn new_named_or_fallback(name: &str) -> io::Result<Self> {
+        match NamedProducerHandle::new(name) {
+            Ok(named) => Ok(InputProducer::Named(named)),
+            Err(_) => ProducerHandle::new().map(InputProducer::Legacy),
+        }
+    }
+
+    /// Open the legacy anonymous producer directly.
+    pub fn new_legacy() -> io::Result<Self> {
+        ProducerHandle::new().map(InputProducer::Legacy)
+    }
+
+    pub fn write_event(&mut self, event: orbclient::Event) -> io::Result<()> {
+        match self {
+            InputProducer::Named(h) => h.write_event(&event),
+            InputProducer::Legacy(h) => h.write_event(event),
+        }
+    }
 }