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When pretty-printing a commit in the email format, we have to fill in the "after subject" field of the pretty_print_context with any extra headers the user provided (e.g., from "--to" or "--cc" options) plus any special MIME headers. We return an out-pointer that sometimes points to a newly heap-allocated string and sometimes not. To avoid leaking, we store the allocated version in a buffer with static lifetime, which is ugly. Worse, as we extend the header feature, we'll end up having to repeat this ugly pattern. Instead, let's have our out-pointer pass ownership back to the caller, and duplicate the string when necessary. This does mean one extra allocation per commit when you use extra headers, but in the context of format-patch which is showing diffs, I don't think that's even measurable. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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