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interpret_branch_name(): handle auto-namelen for @{-1}
The interpret_branch_name() function takes a ptr/len pair for the name, but you can pass "0" for "namelen", which will cause it to check the length with strlen(). However, before we do that auto-namelen magic, we call interpret_nth_prior_checkout(), which gets fed the bogus "0". This was broken by 8cd4249 (interpret_branch_name: always respect "namelen" parameter, 2014-01-15). Though to be fair to that commit, it was broken in the _opposite_ direction before, where we would always treat "name" as a string even if a length was passed. You can see the bug with "git log -g @{-1}". That code path always passes "0", and without this patch it cannot figure out which branch's reflog to show. We can fix it by a small reordering of the code. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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