Replace CStr::from_ptr() with CStr::from_bytes_with_nul()
#82
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MarijnS95
commented
Sep 10, 2024
MarijnS95
commented
Sep 10, 2024
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Sorry for noticing your PR a bit late. Just ping me next time, it's ok. Let me know when you are ready for review. |
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@Nercury nice timing; I was updating it as we speak after noticing I left this sit idle :). It's ready for review now. |
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Whoopsie it has merge conflict now. |
`CStr::from_ptr()` is `unsafe` because it reads a raw pointer, and searches for a terminating nul character in the pointed region of memory. This is unnecessary as both calls already initialize a given number of characters and terminate with a nul, allowing us to pass a sized and initialized slice (without casting `*const MaybeUninit<u8>` to `*const u8`) directly to `CStr::from_bytes_with_nul()` (available since Rust 1.10, unlike `CStr::from_bytes_until_nul()` which was only stabilized in 1.69). Unfortunately all `std` helper APIs to initialize slices of `MaybeUninit` are still unstable, making this less ideal to write at the moment.
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For #81 (comment)
CStr::from_ptr()isunsafebecause it reads a raw pointer, and searches for a terminating nul character in the pointed region of memory.This is unnecessary as both calls already initialize a given number of characters and terminate with a nul, allowing us to pass a sized and initialized slice (without casting
*const MaybeUninit<u8>to*const u8) directly toCStr::from_bytes_with_nul()(available since Rust 1.10, unlikeCStr::from_bytes_until_nul()which was only stabilized in 1.69). Unfortunately allstdhelper APIs to initialize slices ofMaybeUninitare still unstable, making this less ideal to write at the moment.