fix(autocmd): safely parse buflocal buffer numbers (#40436)

* refactor(autocmd): safely parse buflocal buffer numbers

Replace unsafe atoi with a robust integer conversion when extracting
the buffer number out of a "<buffer=123>" pattern in
aupat\_get\_buflocal\_nr.

This prevents potential silent integer overflows and ensures variables
fit safely within INT\_MAX boundaries before truncation.

* fix(autocmd): use getdigits_int to safely parse buffer numbers

* fix(autocmd): raise error for invalid buffer-local pattern values

When defining an autocommand, an invalid buffer-local pattern format
(such as `<buffer=foo>` or `<buffer=0>`) would previously fall through
silently and default to a generic `<buffer>` tag behavior.

Fix this regression by trapping invalid buffer numbers
early from `aupat_get_buflocal_nr()` and throwing a proper E680 error
to match Vim's runtime validation behavior.

0 files changed, 0 insertions, 0 deletions