While working on #13764 I noticed that DateTime::to_string() would just
return an empty String if the format included an invalid specifier
(eg `%Q`). This seems to be a mistake. POSIX date(1), which I believe
we are basing our implementation on, only replaces valid specifiers,
and any invalid ones get included as literals in the output.
For example, on Linux `date "+%Quiz"` returns "%Quiz", but we were
returning "".
This new class with an admittedly long OOP-y name provides a circular
queue in shared memory. The queue is a lock-free synchronous queue
implemented with atomics, and its implementation is significantly
simplified by only accounting for one producer (and multiple consumers).
It is intended to be used as a producer-consumer communication
datastructure across processes. The original motivation behind this
class is efficient short-period transfer of audio data in userspace.
This class includes formal proofs of several correctness properties of
the main queue operations `enqueue` and `dequeue`. These proofs are not
100% complete in their existing form as the invariants they depend on
are "handwaved". This seems fine to me right now, as any proof is better
than no proof :^). Anyways, the proofs should build confidence that the
implemented algorithms, which are only roughly based on existing work,
operate correctly in even the worst-case concurrency scenarios.
For now, EventLoop and Application still have a make_inspectable
parameter, so that when working on an application you can temporarily
hard-code it to be inspectable rather than having to set the env var
each time.
Similar reasoning to making Core::Stream::read() return Bytes, except
that every user of read_line() creates a StringView from the result, so
let's just return one right away.
A mistake I've repeatedly made is along these lines:
```c++
auto nread = TRY(source_file->read(buffer));
TRY(destination_file->write(buffer));
```
It's a little clunky to have to create a Bytes or StringView from the
buffer's data pointer and the nread, and easy to forget and just use
the buffer. So, this patch changes the read() function to return a
Bytes of the data that were just read.
The other read_foo() methods will be modified in the same way in
subsequent commits.
Fixes#13687
This is a single function, which behaves like the various LibC exec()
functions depending on the passed parameters. No direct equivalent is
made for execl() - you have to wrap your arguments in a Span of some
kind.
On Serenity, this calls the syscall directly, whereas Lagom forwards to
the appropriate LibC function.
If the .config directory (or its children, like lib) was deleted,
ConfigFile would crash because it would try to open or create a file in
a directory that didn't exist. Therefore, for user and library configs
(but not system configs), ensure that the parent directories exist. This
allows the user to delete the entire .config folder and all apps still
work. (Except those which can't handle missing config. That's a separate
issue though.)
Fixes#13555
Note: Some changes to pledges and unveils are necessary for this to
work. The only one who can recreate .config at the moment is
ConfigServer, as others probably don't pledge the user home directory.
Core::Directory represents an existing directory on the system, and it
holds an actual file descriptor so that the user can be sure the
directory stays in existence.
This adds the ability to hide certain options from certain help texts.
`--complete` is always hidden, whereas `--help` and `--version` are
hidden from Markdown help text only.
Note that in all cases these three options are hidden from the short
usage line.
Previously, size properties were a JSON object of the form { "width": x,
"height": y }. Now they are a JSON array [x, y]. Reasons for this
change:
- Much more concise.
- More intuitive, as existing multi-dimensional properties (like
margins) already use this array format.
When completing `ls -l` to add another short option, the invariant
length should be zero as we are not replacing anything with our
suggestion.
Also skip the initial dash if there already is one.
Fixes#13301.
The names stdout / stderr are bound to conflict with existing
declarations when compiling against other LibC's. The build on OpenBSD
is broken for this reason at the moment.
Lets rename the members to more generic names to resolve the situation.
This removes them from the main invocation example in --help, as well as
hides them from autocomplete results (we were previously special-casing
"help" and "version").
This converts the return value of File::read_link() from String to
ErrorOr<String>.
The rest of the change is to support the potential of an Error being
returned and subsequent release of the value when no Error is returned.
Unfortunately at this stage none of the places affected can utililize
our TRY() macro.
In a few places we intentionally drop privileges to reduce the potential
security surface area of networked program, with the pattern of:
```
if (setgid(getgid()) || setuid(getuid()) {
return 1;
}
```
We can make this a bit nicer to use by creating a wrapper.
This MIME type can be associated with every file, text/plain only with
plaintext files.
This makes browsers (e.g Firefox) properly displaying download progress
when downloading files in WebServer :^)
This helps make the overall codebase consistent. `class_name()` in
`Kernel` is always `StringView`, but not elsewhere.
Additionally, this results in the `strlen` (which needs to be done
when printing or other operations) always being computed at
compile-time.
Day and month name constants are defined in numerous places. This
pulls them together into a single place and eliminates the
duplication. It also ensures they are `constexpr`.
This is not strictly required, as we are comparing hashes, not the
password it self. However given this is generic code that could be
used anywhere in the system, it seems prudent to be cautious and
make sure we don't inadvertently leak any information about the hash
via timing attacks in future usages of `LibCore::Account`.
Reported-by: Jessica Hamilton <jessica.l.hamilton@gmail.com>
Also use the daylight global to determine the current time zone name,
i.e. tzname[0] is standard time, tzname[1] is daylight savings time.
Note that altzone isn't required to be defined on all systems, so we
have to #ifdef to check if it exists in order for Lagom to build.
The local file header signature of a ZIP entry is normally 0x04034B50
and stored in little-endian byte order. Therefore, if the archive
starts with an entry we can identify a ZIP file by checking if the
first two bytes are 0x504B (PK).
Also checks for the .zip file extension, which is is also used by file
if no byte signature was detected.
