Rollup merge of #73963 - hellow554:unsafe_path, r=Mark-Simulacrum
deny(unsafe_op_in_unsafe_fn) in libstd/path.rs The libstd/path.rs part of #73904 . Wraps the two calls to an unsafe fn Initializer::nop() in an unsafe block.
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44be933ff7
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@ -58,6 +58,7 @@
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//! [`push`]: PathBuf::push
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#![stable(feature = "rust1", since = "1.0.0")]
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#![deny(unsafe_op_in_unsafe_fn)]
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#[cfg(test)]
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mod tests;
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@ -294,7 +295,8 @@ fn os_str_as_u8_slice(s: &OsStr) -> &[u8] {
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unsafe { &*(s as *const OsStr as *const [u8]) }
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}
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unsafe fn u8_slice_as_os_str(s: &[u8]) -> &OsStr {
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&*(s as *const [u8] as *const OsStr)
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// SAFETY: see the comment of `os_str_as_u8_slice`
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unsafe { &*(s as *const [u8] as *const OsStr) }
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}
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// Detect scheme on Redox
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@ -314,24 +316,21 @@ fn has_physical_root(s: &[u8], prefix: Option<Prefix<'_>>) -> bool {
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// basic workhorse for splitting stem and extension
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fn split_file_at_dot(file: &OsStr) -> (Option<&OsStr>, Option<&OsStr>) {
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unsafe {
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if os_str_as_u8_slice(file) == b".." {
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return (Some(file), None);
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}
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if os_str_as_u8_slice(file) == b".." {
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return (Some(file), None);
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}
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// The unsafety here stems from converting between &OsStr and &[u8]
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// and back. This is safe to do because (1) we only look at ASCII
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// contents of the encoding and (2) new &OsStr values are produced
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// only from ASCII-bounded slices of existing &OsStr values.
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let mut iter = os_str_as_u8_slice(file).rsplitn(2, |b| *b == b'.');
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let after = iter.next();
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let before = iter.next();
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if before == Some(b"") {
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(Some(file), None)
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} else {
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(before.map(|s| u8_slice_as_os_str(s)), after.map(|s| u8_slice_as_os_str(s)))
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}
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// The unsafety here stems from converting between &OsStr and &[u8]
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// and back. This is safe to do because (1) we only look at ASCII
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// contents of the encoding and (2) new &OsStr values are produced
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// only from ASCII-bounded slices of existing &OsStr values.
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let mut iter = os_str_as_u8_slice(file).rsplitn(2, |b| *b == b'.');
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let after = iter.next();
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let before = iter.next();
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if before == Some(b"") {
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(Some(file), None)
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} else {
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unsafe { (before.map(|s| u8_slice_as_os_str(s)), after.map(|s| u8_slice_as_os_str(s))) }
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}
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}
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@ -1702,7 +1701,7 @@ impl Path {
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// The following (private!) function allows construction of a path from a u8
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// slice, which is only safe when it is known to follow the OsStr encoding.
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unsafe fn from_u8_slice(s: &[u8]) -> &Path {
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Path::new(u8_slice_as_os_str(s))
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unsafe { Path::new(u8_slice_as_os_str(s)) }
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}
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// The following (private!) function reveals the byte encoding used for OsStr.
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fn as_u8_slice(&self) -> &[u8] {
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