linux-kernel - [RFC v2 19/20] rust: allow extracting the buffer from a CString

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Message-ID: <20250227030952.2319050-20-alistair@alistair23.me>
Date: Thu, 27 Feb 2025 13:09:51 +1000
From: Alistair Francis <alistair@...stair23.me>
To: linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lukas@...ner.de,
	linux-pci@...r.kernel.org,
	bhelgaas@...gle.com,
	Jonathan.Cameron@...wei.com,
	rust-for-linux@...r.kernel.org,
	akpm@...ux-foundation.org
Cc: boqun.feng@...il.com,
	bjorn3_gh@...tonmail.com,
	wilfred.mallawa@....com,
	aliceryhl@...gle.com,
	ojeda@...nel.org,
	alistair23@...il.com,
	a.hindborg@...nel.org,
	tmgross@...ch.edu,
	gary@...yguo.net,
	alex.gaynor@...il.com,
	benno.lossin@...ton.me,
	Alistair Francis <alistair@...stair23.me>
Subject: [RFC v2 19/20] rust: allow extracting the buffer from a CString

The kernel CString is a wrapper aroud a KVec. This patch allows
retrieving the underlying buffer and consuming the CString. This allows
users to create a CString from a string and then retrieve the underlying
buffer.

Signed-off-by: Alistair Francis <alistair@...stair23.me>
---
 rust/kernel/str.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 28e2201604d6..76862e91b81a 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -855,6 +855,11 @@ pub fn try_from_fmt(args: fmt::Arguments<'_>) -> Result<Self, Error> {
         // exist in the buffer.
         Ok(Self { buf })
     }
+
+    /// Return the internal buffer while consuming the original [`CString`]
+    pub fn take_buffer(self) -> KVec<u8> {
+        self.buf
+    }
 }
 
 impl Deref for CString {
-- 
2.48.1