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From:   Miguel Ojeda <ojeda@kernel.org>
To:     Miguel Ojeda <ojeda@kernel.org>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
        =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= <bjorn3_gh@protonmail.com>
Cc:     rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
        patches@lists.linux.dev
Subject: [PATCH v1 22/28] rust: str: add `fmt!` macro
Date:   Thu, 10 Nov 2022 17:41:34 +0100
Message-Id: <20221110164152.26136-23-ojeda@kernel.org>
In-Reply-To: <20221110164152.26136-1-ojeda@kernel.org>
References: <20221110164152.26136-1-ojeda@kernel.org>
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From: Wedson Almeida Filho <wedsonaf@gmail.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@gmail.com>
[Reworded, adapted for upstream and applied latest changes]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/kernel/str.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 877148b77e71..ffac633423db 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -592,3 +592,9 @@ 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