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Communicate the safety invariants of these methods with `unsafe fn`
rather than privacy.
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When concatenating two WTF-8 strings, surrogate pairs at the boundaries
need to be joined. However, since UTF-8 strings cannot contain surrogate
halves, this check can be skipped when one string is UTF-8. Specialize
`OsString::push` to use a more efficient concatenation in this case.
Unfortunately, a specialization for `T: AsRef<str>` conflicts with
`T: AsRef<OsStr>`, so stamp out string types with a macro.
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* Order items as the average of the two adaptors. Enables easier diffs.
* Consistently apply #[inline].
* Implement FromInner<Vec<u8>> for bytes::Buf.
* Implement Clone::clone_from for wtf8::Buf.
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Since the stabilization in #127679 has reached stage0, 1.82-beta, we can
start using `&raw` freely, and even the soft-deprecated `ptr::addr_of!`
and `ptr::addr_of_mut!` can stop allowing the unstable feature.
I intentionally did not change any documentation or tests, but the rest
of those macro uses are all now using `&raw const` or `&raw mut` in the
standard library.
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The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
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#126333
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PathBuf: replace transmuting by accessor functions
The existing `repr(transparent)` was anyway insufficient as `OsString` was not `repr(transparent)`. And furthermore, on Windows it was blatantly wrong as `OsString` wraps `Wtf8Buf` which is a `repr(Rust)` type with 2 fields:
https://github.com/rust-lang/rust/blob/51a7396ad3d78d9326ee1537b9ff29ab3919556f/library/std/src/sys_common/wtf8.rs#L131-L146
So let's just be honest about what happens and add accessor methods that make this abstraction-breaking act of PathBuf visible on the APIs that it pierces through.
Fixes https://github.com/rust-lang/rust/issues/124409
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On Windows and UEFI this improves performance and error messaging.
On other platforms we optimize the fast path a bit more.
This also prepares for later relaxing the checks on certain platforms.
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