Resguardo inicial

linux-7.2.3/rust/kernel/alloc/kvec/errors.rs

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Errors for the [`Vec`] type.
+
+use crate::{
+    fmt,
+    prelude::*, //
+};
+
+/// Error type for [`Vec::push_within_capacity`].
+pub struct PushError<T>(pub T);
+
+impl<T> fmt::Debug for PushError<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Not enough capacity")
+    }
+}
+
+impl<T> From<PushError<T>> for Error {
+    #[inline]
+    fn from(_: PushError<T>) -> Error {
+        // Returning ENOMEM isn't appropriate because the system is not out of memory. The vector
+        // is just full and we are refusing to resize it.
+        EINVAL
+    }
+}
+
+/// Error type for [`Vec::remove`].
+pub struct RemoveError;
+
+impl fmt::Debug for RemoveError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Index out of bounds")
+    }
+}
+
+impl From<RemoveError> for Error {
+    #[inline]
+    fn from(_: RemoveError) -> Error {
+        EINVAL
+    }
+}
+
+/// Error type for [`Vec::insert_within_capacity`].
+pub enum InsertError<T> {
+    /// The value could not be inserted because the index is out of bounds.
+    IndexOutOfBounds(T),
+    /// The value could not be inserted because the vector is out of capacity.
+    OutOfCapacity(T),
+}
+
+impl<T> fmt::Debug for InsertError<T> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            InsertError::IndexOutOfBounds(_) => write!(f, "Index out of bounds"),
+            InsertError::OutOfCapacity(_) => write!(f, "Not enough capacity"),
+        }
+    }
+}
+
+impl<T> From<InsertError<T>> for Error {
+    #[inline]
+    fn from(_: InsertError<T>) -> Error {
+        EINVAL
+    }
+}