DEFINE_POINTER_ARRAY_CLEAR_FUNC() generates a helper of the form
helper_array_clear(T *array, size_t n) that drops each element but does
not free the array itself, parallel to DEFINE_POINTER_ARRAY_FREE_FUNC()
for cases where the array has automatic storage duration.
CLEANUP_ELEMENTS() pairs with these helpers to provide a _cleanup_-like
attribute for fixed-size arrays: the bound is taken from ELEMENTSOF(),
and the helper is invoked across the elements at scope exit. Compared to
CLEANUP_ARRAY(), the storage is neither freed nor zeroed.
Migrate various logic across the tree over to the new macros.
sd-device: use DEFINE_POINTER_ARRAY_CLEAR_FUNC() for sd_device_unref_array_clear()
Replace the local device_unref_many() helper with the macro-generated
equivalent.
format-table: switch help-table arrays to CLEANUP_ELEMENTS()
Generate table_unref_array_clear() via DEFINE_POINTER_ARRAY_CLEAR_FUNC()
and convert the help-table arrays in bootctl, cryptenroll, nspawn,
repart and vmspawn to CLEANUP_ELEMENTS(). The arrays no longer need a
trailing NULL slot, so the size matches ELEMENTSOF() of the groups
array.
firewall-util: switch netlink message arrays to CLEANUP_ELEMENTS()
Generate sd_netlink_message_unref_array_clear() via
DEFINE_POINTER_ARRAY_CLEAR_FUNC() in place of the NULL-terminated
sd_netlink_message_unref_many(), and convert the two stack arrays of
sd_netlink_message pointers to CLEANUP_ELEMENTS().
Daan De Meyer
9d2f5b4611