`.as_mut_buf` was used exactly once, in `.push_char` which could be
written in a simpler way, using the `&mut ~[u8]` that it already
retrieved. In the rare situation when someone really needs
`.as_mut_buf`-like functionality (getting a `*mut u8`), they can go via
`str::raw::as_owned_vec`.
This function had type &[u8] -> ~str, i.e. it allocates a string
internally, even though the non-allocating version that take &[u8] ->
&str and ~[u8] -> ~str are all that is necessary in most circumstances.
This involved changing a fair amount of code, rooted in how we access the local
IoFactory instance. I added a helper method to the rtio module to access the
optional local IoFactory. This is different than before in which it was assumed
that a local IoFactory was *always* present. Now, a separate io_error is raised
when an IoFactory is not present, yet I/O is requested.
This removes the PathLike trait associated with this "support module". This is
yet another "container of bytes" trait, so I didn't want to duplicate what
already exists throughout libstd. In actuality, we're going to pass of C strings
to the libuv APIs, so instead the arguments are now bound with the 'ToCStr'
trait instead.
Additionally, a layer of complexity was removed by immediately converting these
type-generic parameters into CStrings to get handed off to libuv apis.
d4a32386f3 broke these since slice_to() and slice_from() must get character
boundaries, and arbitrary needle lengths don't necessarily map to character
boundaries of the haystack.
This also adds new tests that would have caught this bug.
Moved OwnedStr doc comments from impl to trait.
Added a few #[inline] hints.
The doc comment changes make the source a bit harder to read, as
documentation and implementation no longer live right next to each
other. But this way they at least appear in the docs.
Fix uint overflow bugs in std::{at_vec, vec, str}
Closes#8742
Fix issue #8742, which summarized is: unsafe code in vec and str did assume
that a reservation for `X + Y` elements always succeeded, and didn't overflow.
Introduce the method `Vec::reserve_additional(n)` to make it easy to check for
overflow in `Vec::push` and `Vec::push_all`.
In std::str, simplify and remove a lot of the unsafe code and use `push_str`
instead. With improvements to `.push_str` and the new function
`vec::bytes::push_bytes`, it looks like this change has either no or positive
impact on performance.
I believe there are many places still where `v.reserve(A + B)` still can overflow.
This by itself is not an issue unless followed by (unsafe) code that steps aside
boundary checks.
