[PATCH v3 20/21] rust: allow extracting the buffer from a CString

[alistair23@gmail.com]

From: Alistair Francis <alistair@alistair23.me>

The kernel CString is a wrapper around 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@alistair23.me>
Reviewed-by: Gary Guo <gary@garyguo.net>
---
 rust/kernel/str.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index a556788bcc5e..3fd8a218547f 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -870,6 +870,12 @@ 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`]
+    #[inline]
+    pub fn into_vec(self) -> KVec<u8> {
+        self.buf
+    }
 }
 
 impl Deref for CString {
-- 
2.55.0