this also deletes C string literals from the language, and then makes
the std lib changes and compiler changes necessary to get the behavior
tests and std lib tests passing again.
It had the downside of running all the comptime blocks and resolving
all the usingnamespaces of each system, when just trying to discover if
the current system is a particular one.
For Darwin, where it's nice to use `std.Target.current.isDarwin()`, this
demonstrates the utility that #425 would provide.
* Added `std.c.unlinkat` and `std.os.unlinkat`.
* Removed `std.fs.MAX_BUF_BYTES` (this declaration never made it to
master branch)
* Added `std.fs.Dir.deleteTree` to be used on an open directory handle.
* `std.fs.deleteTree` has better behavior for both relative and
absolute paths. For absolute paths, it opens the base directory
and uses that handle for subsequent operations. For relative paths,
it does a similar strategy, using the cwd handle.
* The error set of `std.fs.deleteTree` is improved to no longer have
these possible errors:
- OutOfMemory
- FileTooBig
- IsDir
- DirNotEmpty
- PathAlreadyExists
- NoSpaceLeft
* Added `std.fs.Dir.posix_cwd` which is a statically initialized
directory representing the current working directory.
* The error set of `std.Dir.open` is improved to no longer have these
possible errors:
- FileTooBig
- IsDir
- NoSpaceLeft
- PathAlreadyExists
- OutOfMemory
* Added more alternative functions to `std.fs` for when the path
parameter is a null terminated string. This can sometimes be more
effecient on systems which have an ABI based on null terminated
strings.
* Added `std.fs.Dir.openDir`, `std.fs.Dir.deleteFile`, and
`std.fs.Dir.deleteDir` which all operate on an open directory handle.
* `std.fs.Walker.Entry` now has a `dir` field, which can be used to do
operations directly on `std.fs.Walker.Entry.basename`, avoiding
`error.NameTooLong` for deeply nested paths.
* Added more docs to `std.os.OpenError`
This commit does the POSIX components for these changes. I plan to
follow up shortly with a commit for Windows.
* `std.os.execve` had the wrong name; it should have been
`std.os.execvpe`. This is now corrected.
* introduce `std.os.execveC` which does not look at PATH, and uses
null terminated parameters, matching POSIX ABIs. It does not
require an allocator.
* fix typo nonsense doc comment in `std.fs.MAX_PATH_BYTES`.
* introduce `std.os.execvpeC`, which is like `execvpe` except it
uses null terminated parameters, matching POSIX ABIs, and thus
does not require an allocator.
* `std.os.execvpe` implementation is reworked to only convert
parameters and then delegate to `std.os.execvpeC`.
* `std.os.execvpeC` improved to handle `ENOTDIR`. See #3415
