listxattr() is defined:
pub fn listxattr<P>(path: P, list: &mut [c::c_char]) -> io::Result<usize>
where
P: path::Arg,which seems reasonable enough. It's c_char under there, of course. Unfortunately, at least on my platform (x86_64) this type is equivalent to &mut [i8] which is a bit more of an oddity.
The issue here is that there are an awful lot of APIs for converting between string types in Rust, and pretty much none of them consider [i8] as a string representation.
In particular: the name field of rustix::fs::getxattr() wants a &CStr. I'm not sure of a good way to get from one to the other.
The core slice type has split_inclusive() which is a very nice way to iterate the returned values. You get the string plus the nul terminator, which you can then pass to CStr:from_bytes_with_nul.... if it were a [u8] slice.
But since it's [i8] you end up having to do an unsafe transmute or an extremely explicit character-by-character conversion.
Of course, because of the embedded nuls, this API can't return CString. But how about some variant of [u8] instead?
listxattr()is defined:which seems reasonable enough. It's
c_charunder there, of course. Unfortunately, at least on my platform (x86_64) this type is equivalent to&mut [i8]which is a bit more of an oddity.The issue here is that there are an awful lot of APIs for converting between string types in Rust, and pretty much none of them consider
[i8]as a string representation.In particular: the
namefield ofrustix::fs::getxattr()wants a&CStr. I'm not sure of a good way to get from one to the other.The core slice type has
split_inclusive()which is a very nice way to iterate the returned values. You get the string plus the nul terminator, which you can then pass toCStr:from_bytes_with_nul.... if it were a[u8]slice.But since it's
[i8]you end up having to do an unsafe transmute or an extremely explicit character-by-character conversion.Of course, because of the embedded nuls, this API can't return
CString. But how about some variant of[u8]instead?