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ptest() was using this idea already. As far as I can see, this is safe. Ttestsuite passes. One downside is that a temporary from e.g. printf invocation won't be freed until the next printf call. function old new delta awk_printf 481 468 -13 as_regex 137 111 -26 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-39) Total: -39 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>