Passing an unrecognised project name triggered a buffer overflow while
building the available-projects error list: collect_db_project_names did
snprintf(out+offset, out_sz-offset, ...) with no bound, so once the
listed names exceeded the 4 KB projects buffer, (out_sz - offset)
underflowed (unsigned) to a huge size and snprintf wrote past the buffer.
Fixed in 21c73b5 (PR #352) with an offset>=out_sz bounds check + clamp.
This test fills a temp CBM_CACHE_DIR with 40 long-named .db files
(~5 KB of names) and issues a bad-project search_graph call; the test
build runs under -fsanitize=address so the old underflow would abort here.
Closes#235.
Martin Vogel
de069d117e