linux-kernel - [PATCH] rust: str: add to_ascii_{upper,lower}case() to CString

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Date: Mon, 22 Jan 2024 19:45:57 +0100
From: Danilo Krummrich <dakr@...hat.com>
To: ojeda@...nel.org,
	alex.gaynor@...il.com,
	wedsonaf@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
	a.hindborg@...sung.com,
	aliceryhl@...gle.com
Cc: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Danilo Krummrich <dakr@...hat.com>
Subject: [PATCH] rust: str: add to_ascii_{upper,lower}case() to CString

Add functions to convert a CString to upper- / lowercase assuming all
characters are ASCII encoded.

Signed-off-by: Danilo Krummrich <dakr@...hat.com>
---
 rust/kernel/str.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 7d848b83add4..d21151d89861 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -581,6 +581,16 @@ pub fn try_from_fmt(args: fmt::Arguments<'_>) -> Result<Self, Error> {
         // exist in the buffer.
         Ok(Self { buf })
     }
+
+    /// Converts the whole CString to lowercase.
+    pub fn to_ascii_lowercase(&mut self) {
+        self.buf.make_ascii_lowercase();
+    }
+
+    /// Converts the whole CString to uppercase.
+    pub fn to_ascii_uppercase(&mut self) {
+        self.buf.make_ascii_uppercase();
+    }
 }
 
 impl Deref for CString {

base-commit: 610347effc2ecb5ededf5037e82240b151f883ab
-- 
2.43.0