Hash :
9e93e5e5
Author :
Date :
2025-04-13T10:25:02
symbols: Restrict the number of actions and keysyms per level
In preparation to support capitalization in `xkb_state_key_get_syms()`,
this commit reduces the number of supported actions and keysyms per
level, going from UINT_MAX to UINT16_MAX. This is most likely still more
than enough and could be even reduced further, but deemed unnecessary
at the moment: alignment of `struct xkb_level` is driven by the fields
`a` and `s`.
- Switched the item count type from `unsigned int` to `uint16_t`.
- Introduced `xkb_{action,keysym}_count_t` type for the respective item
count for exact typing.
- Added relevant bounds checks.
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.
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
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.
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.
See Compatibility notes.
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:
Many thanks are due to Dan Nicholson for his heroic work in getting xkbcommon off the ground initially.