Luca Boccassi
c0b3b855b7
`print_list()` and `print_info()` used `RETRIEVE()` to `strndup()` the entire `COREDUMP` field into a heap-allocated string, only to check whether it exists. With `sd_journal_set_data_threshold(j, 0)` in `print_info()`, this copies the full coredump binary (potentially hundreds of MB) to heap just to print "Storage: journal". This PR: 1. Makes `sd_journal_get_data()` output parameters optional (`NULL`-safe), so callers can do pure existence checks without receiving the data. 2. Short-circuits `maybe_decompress_payload()` after `decompress_startswith()` succeeds when neither output pointer is requested, skipping full blob decompression for compressed journal entries. 3. Switches coredumpctl to pass `NULL, NULL` for the existence checks instead of heap-copying via `RETRIEVE()`.
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