kc3-lang/libxkbcommon

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    Commit

  • Hash : 5ef19bcf
    Author : Pierre Le Marre
    Date : 2025-02-13T17:58:21 

    xkbcomp: Fix incorrect memory comparison

Spotted by clang-tidy:

```
../src/keymap-priv.c:146:16: warning: comparing object representation of
                             type 'union xkb_action' which does not have
                             a unique object representation; consider
                             comparing the members of the object manually
                             [bugprone-suspicious-memory-comparison]
````

Indeed, from “EXP42-C. Do not compare padding data”[^1]:

> unnamed members of objects of structure and union type do not participate
> in initialization. Unnamed members of structure objects have indeterminate
> representation even after initialization.

Fixed by using a dedicated comparison function for `union xkb_action`.

[^1]: https://wiki.sei.cmu.edu/confluence/display/c/EXP42-C.+Do+not+compare+padding+data

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    Description

    keymap handling library for toolkits and window systems
    Users
    		 thodg_m kc3_lang_org thodg_w www_kmx_io thodg thodg_l
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  • README.md

  • libxkbcommon

    libxkbcommon is a keyboard keymap compiler and support library which processes a reduced subset of keymaps as defined by the XKB (X Keyboard Extension) specification. It also contains a module for handling Compose and dead keys and a separate registry library for listing available keyboard layouts.

    Quick Guide

    Building

    libxkbcommon is built with Meson:

    meson setup build
meson compile -C build
meson test -C build # Run the tests.

    To build for use with Wayland, you can disable X11 support while still using the X11 keyboard configuration resource files thusly:

    meson setup build \
    -Denable-x11=false \
    -Dxkb-config-root=/usr/share/X11/xkb \
    -Dx-locale-root=/usr/share/X11/locale
meson compile -C build
    Complete list of user options @include meson_options.txt

    API

    While libxkbcommon’s API is somewhat derived from the classic XKB API as found in X11/extensions/XKB.h and friends, it has been substantially reworked to expose fewer internal details to clients.

    See the API Documentation.

    Dataset

    libxkbcommon does not distribute a keyboard layout dataset itself, other than for testing purposes. The most common dataset is xkeyboard-config, which is used by all current distributions for their X11 XKB data. Further information on xkeyboard-config is available at its homepage and at its repository.

    The dataset for Compose is distributed in libX11, as part of the X locale data.

    Relation to X11

    See Compatibility notes.

    Development

    An extremely rudimentary homepage can be found at

    https://xkbcommon.org

    xkbcommon is maintained in git at

    https://github.com/xkbcommon/libxkbcommon

    Patches are always welcome, and may be sent to either xorg-devel@lists.x.org or wayland-devel@lists.freedesktop.org or in a GitHub pull request.

    Bug reports (and usage questions) are also welcome, and may be filed at GitHub.

    The maintainers are:

    Credits

    Many thanks are due to Dan Nicholson for his heroic work in getting xkbcommon off the ground initially.

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