Given that the previous design would require the use of a default
allocator to have `ArgIterator.init()` work in WASI, and since in
Zig we're trying to avoid default allocators, I've changed the design
slightly in that now `init()` is a compile error in WASI, and instead
in its message it points to `initWithAllocator(*mem.Allocator)`.
The latter by virtue of requiring an allocator as an argument can
safely be used in WASI as well as on other OSes (where the allocator
argument is simply unused). When using `initWithAllocator` it is then
natural to remember to call `deinit()` after being done with the
iterator. Also, to make use of this, I've also added `argsWithAllocator`
function which is equivalent to `args` minus the requirement of supplying
an allocator and being fallible.
Finally, I've also modified the WASI only test `process.ArgWasiIterator`
to test all OSes.
This commit pulls WASI specific implementation of args extraction
from the runtime from `process.argsAlloc` and `process.argsFree`
into a new iterator struct `process.ArgIteratorWasi`. It also
integrates the struct with platform-independent `process.ArgIterator`.
I'm not sure why I disabled them when landing extended Wasm/WASI
support, but they pass the parser tests just fine now, so I'm gonna
go ahead and re-enable them.
* change miscellaneous things to more idiomatic zig style
* change the digest length to 24 bytes instead of 48. This is
still 70 more bits than UUIDs. For an analysis of probability of
collisions, see:
https://en.wikipedia.org/wiki/Universally_unique_identifier#Collisions
* fix the API having the possibility of mismatched allocators
* fix some error paths to behave properly
* modify the guarantees about when file contents are loaded for input files
* pwrite instead of seek + write
* implement isProblematicTimestamp
* fix tests with regards to a working isProblematicTimestamp function.
this requires sleeping until the current timestamp becomes
unproblematic.
* introduce std.fs.File.INode, a cross platform type abstraction
so that cache hash implementation does not need to reach into std.os.
