This only queries a single NTP server, only does a point-to-point
request, doens't do any filtering, doesn't display the response
in any useful format, and is generally very bare-bones.
But maybe, over time it can learn to query more servers, do
filtering, run as a service that keeps state over time to
improve filtering, adjust system time, and maybe learn to
run as an NTP server then.
And also mark strlcpy() and strlcat() with __attribute__((warn_unused_result)).
Since our code is warning-free, this ensures we never misuse those functions.
(Or are very sure about doing it when turning off the warning for a particular
piece of code.)
In case we know exactly how many bytes we're copying (and not copying a string
while limiting its length to that of a buffer), memcpy() is a more appropriate
function to call.
Also, fix null-terminating the %c pointer.
This is a strcpy()-like method with actually sane semantics:
* It accepts a non-empty buffer along with its size in bytes.
* It copies as much of the string as fits into the buffer.
* It always null-terminates the result.
* It returns, as a non-discardable boolean, whether the whole string has been
copied.
Intended usage looks like this:
bool fits = string.copy_characters_to_buffer(buffer, sizeof(buffer));
and then either
if (!fits) {
fprintf(stderr, "The name does not fit!!11");
return nullptr;
}
or, if you're sure the buffer is large enough,
// I'm totally sure it fits because [reasons go here].
ASSERT(fits);
or if you're feeling extremely adventurous,
(void)fits;
but don't do that, please.
Now that LibJS's .prettierrc has been moved to the repository root (as
we start having .js files in /res), we don't need to keep a second,
identical copy for the LibWeb tests.
DateTime::create() takes a date/time in local time, but it set
tm_isdst to 0, which meant it was in local winter time always.
Set tm_isdst to -1 so that times during summer time are treated
in summer time, and times in winter time are treated as winter
time (when appropriate). When the time is adjusted backward by
one hour, the same time can be in winter time or summer time,
so this isn't 100% reliable, but for most of the year it should
work fine.
Since LibJS uses DateTime, this means that the Date tuple
ctor (which creates a timestamp from year/month/day/hours/etc
in local time) and getTime() should now have consistent (and
correct) output, which should fix#3327.
In Serenity itself, dst handling (and timezones) are unimplemented
and this doens't have any effect yet, but in Lagom this has an effect.
Add an ExpandableHeap and switch kmalloc to use it, which allows
for the kmalloc heap to grow as needed.
In order to make heap expansion to work, we keep around a 1 MiB backup
memory region, because creating a region would require space in the
same heap. This means, the heap will grow as soon as the reported
utilization is less than 1 MiB. It will also return memory if an entire
subheap is no longer needed, although that is rarely possible.
The move constructor of a lambda just copies it anyway.
Even if the first move() left an 'empty' closure behind, then
'm_editor->on_cursor_change' would only be able to see an empty
closure, which is certainly not what was intended.
Under the hood, a lambda is just a struct full of pointers/references/copies and whatever else
the compiler deems necessary. In the case of 'update_demo', the struct lives on the stack
frame of FontEditorWidget::FontEditorWidget(). Hence it is still alive when it's called
during the constructor.
However, when 'fixed_width_checkbox.on_checked' fires, that stack frame is no longer alive,
and thus the *reference* to the (struct of) the lambda is invalid\! This meant that
'update_demo' silently read invalid data, tried to call '.update()' on some innocent arbitrary
memory address, and it crashed somewhere unrelated.
Passing 'update_demo' by value (like with all the other event handlers) fixes this issue.
Note that this solution only works because 'update_demo' itself has no state; otherwise
the various copies of 'update_demo' might notice that they are, in fact, independent copies
of the original lambda. But that doesn't matter here.
GIFLoader now uses a single frame buffer to cache the last decoded
frame. This drastically reduces memory usage at the small expense of
re-decoding frames on each loop.
RestoreBackground disposal mode is now a transparent fill to allow
background to show through.
RestorePrevious disposal mode now restores the previous frame.
