From: Asahi Lina <lina@asahilina.net>
Date: Fri, 14 Jul 2023 09:19:33 +0000 (+0900)
Subject: rust: kernel: str: Implement Debug for CString
X-Git-Tag: v6.8-rc1~126^2~12
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c3f41b00307f796756ec494b90c9e238800a0ff8;p=thirdparty%2Fkernel%2Flinux.git

rust: kernel: str: Implement Debug for CString

Make it possible to use a `CString` with the `pr_*` macros directly. That
is, instead of:

    pr_debug!("trying to open {:?}\n", &*filename);

we can now write:

    pr_debug!("trying to open {:?}\n", filename);

Signed-off-by: Asahi Lina <lina@asahilina.net>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Link: https://lore.kernel.org/r/20230714-cstring-debug-v1-1-4e7c3018dd4f@asahilina.net
[ Reworded to use Alice's commit message as discussed. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index c41607b2e4fe9..7d848b83add48 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -608,6 +608,12 @@ impl<'a> TryFrom<&'a CStr> for CString {
     }
 }
 
+impl fmt::Debug for CString {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&**self, f)
+    }
+}
+
 /// A convenience alias for [`core::format_args`].
 #[macro_export]
 macro_rules! fmt {