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Improve the safety comment for the `inc_len()` call in `CString::try_from_fmt()` to clarify why `bytes_written()` is guaranteed not to exceed the buffer capacity. The current comment states that bytes written is bounded by size, but does not explain that this invariant is maintained because: 1. The `Formatter` is created with `size` as its capacity limit 2. The `?` operators on `write_fmt` and `write_str` ensure early return if writing exceeds this limit Suggested-by: Gary Guo <gary@garyguo.net> Link: https://lore.kernel.org/rust-for-linux/20221114145329.0f47a3ab@GaryWorkstation/ Link: https://github.com/Rust-for-Linux/linux/issues/936 Signed-off-by: Nakamura Shuta <nakamura.shuta@gmail.com> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Link: https://patch.msgid.link/20260119062925.1647-1-nakamura.shuta@gmail.com [ Updated tags: it was a suggestion from Gary from the mailing list (the linked issue is mostly about adding a `debug_assert_eq!`). - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org> |
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