linux-kernel - [PATCH v7 2/6] rust: str: implement `Index` for `BStr`

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Message-Id: <20250218-module-params-v3-v7-2-5e1afabcac1b@kernel.org>
Date: Tue, 18 Feb 2025 14:00:44 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <benno.lossin@...ton.me>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
 Luis Chamberlain <mcgrof@...nel.org>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Adam Bratschi-Kaye <ark.email@...il.com>, linux-kbuild@...r.kernel.org, 
 Petr Pavlu <petr.pavlu@...e.com>, Sami Tolvanen <samitolvanen@...gle.com>, 
 Daniel Gomez <da.gomez@...sung.com>, Simona Vetter <simona.vetter@...ll.ch>, 
 Greg KH <gregkh@...uxfoundation.org>, linux-modules@...r.kernel.org
Subject: [PATCH v7 2/6] rust: str: implement `Index` for `BStr`

The `Index` implementation on `BStr` was lost when we switched `BStr` from
a type alias of `[u8]` to a newtype. This patch adds back `Index` by
implementing `Index` for `BStr` when `Index` would be implemented for
`[u8]`.

Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
---
 rust/kernel/str.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 002dcddf7c768..ba6b1a5c4f99d 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -114,6 +114,17 @@ fn eq(&self, other: &Self) -> bool {
     }
 }
 
+impl<Idx> Index<Idx> for BStr
+where
+    [u8]: Index<Idx, Output = [u8]>,
+{
+    type Output = Self;
+
+    fn index(&self, index: Idx) -> &Self::Output {
+        BStr::from_bytes(&self.0[index])
+    }
+}
+
 /// Creates a new [`BStr`] from a string literal.
 ///
 /// `b_str!` converts the supplied string literal to byte string, so non-ASCII

-- 
2.47.0