linux-kernel - [PATCH v2 22/28] rust: str: add `fmt!` macro

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Message-Id: <20221202161502.385525-23-ojeda@kernel.org>
Date:   Fri,  2 Dec 2022 17:14:53 +0100
From:   ojeda@...nel.org
To:     Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>
Cc:     rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev
Subject: [PATCH v2 22/28] rust: str: add `fmt!` macro

From: Wedson Almeida Filho <wedsonaf@...il.com>

Add the `fmt!` macro, which is a convenience alias for the Rust
`core::format_args!` macro.

For instance, it may be used to create a `CString`:

    CString::try_from_fmt(fmt!("{}{}", "abc", 42))?

Signed-off-by: Wedson Almeida Filho <wedsonaf@...il.com>
Reviewed-by: Gary Guo <gary@...yguo.net>
[Reworded, adapted for upstream and applied latest changes]
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
 rust/kernel/str.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 17dc8d273302..b771310fa4a4 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -583,3 +583,9 @@ impl Deref for CString {
         unsafe { CStr::from_bytes_with_nul_unchecked(self.buf.as_slice()) }
     }
 }
+
+/// A convenience alias for [`core::format_args`].
+#[macro_export]
+macro_rules! fmt {
+    ($($f:tt)*) => ( core::format_args!($($f)*) )
+}
-- 
2.38.1