Philip Withnall 7ab9359af0 gtimezone: Fix assertion failure when called with a huge offset
This looks like a regression from commit 3356934db5, but prior to that
commit there was always an assertion failure when calling
`g_time_zone_new_offset()` with an offset which is too large (such as 44
hours), ever since the function was added in commit cf24867b93.

It would be ideal if we could return a `NULL` timezone to indicate the
error, but that’s not part of the API for `g_time_zone_new_offset()`, so
we have to go with the dated and not-ideal approach of returning the UTC
timezone and letting the caller figure it out.

Another potential approach would be to reduce the `offset` modulo 24
hours. This makes the error less easily detectable than if returning
UTC, though, and still returns an invalid result: `+44:00` is not the
same timezone as `+20:00` (it’s one day further ahead).

Add a unit test.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Fixes: #2620
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GLib

GLib is the low-level core library that forms the basis for projects such as GTK and GNOME. It provides data structure handling for C, portability wrappers, and interfaces for such runtime functionality as an event loop, threads, dynamic loading, and an object system.

The official download locations are: https://download.gnome.org/sources/glib

The official web site is: https://www.gtk.org/

Installation

See the file 'INSTALL.in'

Supported versions

Only the most recent unstable and stable release series are supported. All older versions are not supported upstream and may contain bugs, some of which may be exploitable security vulnerabilities.

See SECURITY.md for more details.

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  • How to reproduce the bug.
    • If you can reproduce it with one of the test programs that are built in the tests/ subdirectory, that will be most convenient. Otherwise, please include a short test program that exhibits the behavior. As a last resort, you can also provide a pointer to a larger piece of software that can be downloaded.
  • If the bug was a crash, the exact text that was printed out when the crash occurred.
  • Further information such as stack traces may be useful, but is not necessary.

Contributing to GLib

Please follow the contribution guide to know how to start contributing to GLib.

Patches should be submitted as merge requests to gitlab.gnome.org. If the patch fixes an existing issue, please refer to the issue in your commit message with the following notation (for issue 123):

Closes: #123

Otherwise, create a new merge request that introduces the change. Filing a separate issue is not required.

Default branch renamed to main

The default development branch of GLib has been renamed to main. To update your local checkout, use:

git checkout master
git branch -m master main
git fetch
git branch --unset-upstream
git branch -u origin/main
git symbolic-ref refs/remotes/origin/HEAD refs/remotes/origin/main
Description
Low-level core library that forms the basis for projects such as GTK+ and GNOME.
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