refactor(cliprdr): hand-implement Error trait

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

Cargo.lock

@@ -2464,7 +2464,6 @@ dependencies = [
  "ironrdp-core",
  "ironrdp-pdu",
  "ironrdp-svc",
- "thiserror 1.0.69",
  "tracing",
 ]
 

crates/ironrdp-cliprdr/Cargo.toml

@@ -19,7 +19,6 @@ test = false
 ironrdp-core = { path = "../ironrdp-core", version = "0.1" } # public
 ironrdp-pdu = { path = "../ironrdp-pdu", version = "0.5" } # public
 ironrdp-svc = { path = "../ironrdp-svc", version = "0.4" } # public
-thiserror = "1.0" # FIXME: handwrite the Error trait implementations.
 tracing = { version = "0.1", features = ["log"] }
 bitflags = "2.9"
 

crates/ironrdp-cliprdr/src/lib.rs

@@ -22,7 +22,6 @@ use pdu::{
     ClipboardPdu, ClipboardProtocolVersion, FileContentsResponse, FormatDataRequest, FormatListResponse,
     OwnedFormatDataResponse,
 };
-use thiserror::Error;
 use tracing::{error, info};
 
 #[rustfmt::skip] // do not reorder
@@ -31,15 +30,23 @@ use crate::pdu::FormatList;
 /// PDUs for sending to the server on the CLIPRDR channel.
 pub type CliprdrSvcMessages<R> = SvcProcessorMessages<Cliprdr<R>>;
 
-#[derive(Debug, Error)]
+#[derive(Debug)]
 enum ClipboardError {
-    #[error("received clipboard PDU is not implemented")]
     UnimplementedPdu { pdu: &'static str },
-
-    #[error("sent format list was rejected")]
     FormatListRejected,
 }
 
+impl core::fmt::Display for ClipboardError {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        match self {
+            ClipboardError::UnimplementedPdu { pdu } => {
+                write!(f, "received clipboard PDU `{pdu}` is not implemented")
+            }
+            ClipboardError::FormatListRejected => write!(f, "sent format list was rejected"),
+        }
+    }
+}
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 enum CliprdrState {
     Initialization,