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[v1,22/28] rust: str: add `fmt!` macro

Message ID	20221110164152.26136-23-ojeda@kernel.org
State	New
Headers	Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; 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_Roy_Baron?= <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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	Rust core additions \| [v1,00/28] Rust core additions [v1,01/28] rust: prelude: split re-exports into groups [v1,02/28] rust: print: add more `pr_!` levels [v1,03/28] rust: print: add `pr_cont!` macro [v1,04/28] rust: samples: add `rust_print` example [v1,05/28] rust: macros: add `concat_idents!` proc macro [v1,06/28] rust: macros: add `#[vtable]` proc macro [v1,07/28] rust: macros: take string literals in `module!` [v1,08/28] rust: error: declare errors using macro [v1,09/28] rust: error: add codes from `errno-base.h` [v1,10/28] rust: error: add `From` implementations for `Error` [v1,11/28] rust: prelude: add `error::code::` constant items [v1,12/28] rust: alloc: add `RawVec::try_with_capacity_in()` constructor [v1,13/28] rust: alloc: add `Vec::try_with_capacity{,_in}()` constructors [v1,14/28] rust: str: add `BStr` type [v1,15/28] rust: str: add `b_str!` macro [v1,16/28] rust: str: add `CStr` type [v1,17/28] rust: str: implement several traits for `CStr` [v1,18/28] rust: str: add `CStr` unit tests [v1,19/28] rust: str: add `c_str!` macro [v1,20/28] rust: str: add `Formatter` type [v1,21/28] rust: str: add `CString` type [v1,22/28] rust: str: add `fmt!` macro [v1,23/28] rust: std_vendor: add `dbg!` macro based on `std`'s one [v1,24/28] rust: static_assert: add `static_assert!` macro [v1,25/28] rust: add `build_error` crate [v1,26/28] rust: build_assert: add `build_{error,assert}!` macros [v1,27/28] rust: types: add `Either` type [v1,28/28] rust: types: add `Opaque` type

Commit Message

Miguel Ojeda Nov. 10, 2022, 4:41 p.m. UTC

  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(+)

Comments

Gary Guo Nov. 14, 2022, 2:58 p.m. UTC | #1

On Thu, 10 Nov 2022 17:41:34 +0100
Miguel Ojeda <ojeda@kernel.org> wrote:

> 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>

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 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)*) )
> +}

diff mbox series

Patch

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)*) )
+}