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Stop trying to maintain a per-file _POSIX_C_SOURCE. Instead,
require POSIX.1-2008 globally. A lot of core source files depend
on that already.
Some care must be taken on a few select files where we need a bit
more than POSIX. Some files need XSI extensions (_XOPEN_SOURCE) and
some files need BSD extensions (_DEFAULT_SOURCE). In both cases,
these feature test macros imply _POSIX_C_SOURCE. Make sure to not
define both these macros and _POSIX_C_SOURCE explicitly to avoid
POSIX requirement conflicts (e.g. _POSIX_C_SOURCE says POSIX.1-2001
but _XOPEN_SOURCE says POSIX.1-2008).
Additionally, there is one special case in render/vulkan/vulkan.c.
That file needs major()/minor(), and these are system-specific.
On FreeBSD, _POSIX_C_SOURCE hides system-specific symbols so we need
to make sure it's not defined for this file. On Linux, we can
explicitly include <sys/sysmacros.h> and ensure that apart from
symbols defined there the file only uses POSIX toys.
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wlr_xcursor_theme_get_cursor() now does some fallback logic. We
don't want that for checking whether a cursor has already been
loaded.
Fixes: dbedcdb418f4 ("xcursor: add fallbacks for legacy names")
Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3783
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Some XCursor themes still use the legacy names instead of the newer
cursor naming spec [1]. Fall back to the legacy name if the standard
one could not be found.
[1]: https://www.freedesktop.org/wiki/Specifications/cursor-spec/
Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3746
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xcursor.c was copied over from libwayland-cursor. A lot of
cosmetic imporvements have been merged upstream. Copy-paste the
new version.
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Adjust the code style for wlroots, and use calloc() for structs.
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Stop listing all available cursors each time a cursor theme is
loaded. They can be obtained from the CLI instead, e.g.
ls /usr/share/icons/Adwaita/cursors
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