From: Wedson Almeida Filho <wedsonaf@gmail.com>
Date: Thu, 10 Nov 2022 16:41:34 +0000 (+0100)
Subject: rust: str: add `fmt!` macro
X-Git-Tag: v6.2-rc1~166^2~6
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ef32054942ee8d78cbcc2c97212e55b6f5f668f7;p=thirdparty%2Fkernel%2Flinux.git

rust: str: add `fmt!` macro

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>
Reviewed-by: Gary Guo <gary@garyguo.net>
[Reworded, adapted for upstream and applied latest changes]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 17dc8d2733029..b771310fa4a49 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)*) )
+}