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authorJeff King <peff@peff.net>2015-09-24 21:05:45 (GMT)
committerJunio C Hamano <gitster@pobox.com>2015-09-25 17:18:18 (GMT)
commitaf49c6d0918bf04aad89bd885a4eef5767a33d0e (patch)
tree5037171be3cd4be197a9fafdbbcec9b305b96f99 /builtin/fsck.c
parent399ad553ce87fca77a9bc5a0e734a361a9e8a5a3 (diff)
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add reentrant variants of sha1_to_hex and find_unique_abbrev
The sha1_to_hex and find_unique_abbrev functions always write into reusable static buffers. There are a few problems with this: - future calls overwrite our result. This is especially annoying with find_unique_abbrev, which does not have a ring of buffers, so you cannot even printf() a result that has two abbreviated sha1s. - if you want to put the result into another buffer, we often strcpy, which looks suspicious when auditing for overflows. This patch introduces sha1_to_hex_r and find_unique_abbrev_r, which write into a user-provided buffer. Of course this is just punting on the overflow-auditing, as the buffer obviously needs to be GIT_SHA1_HEXSZ + 1 bytes. But it is much easier to audit, since that is a well-known size. We retain the non-reentrant forms, which just become thin wrappers around the reentrant ones. This patch also adds a strbuf variant of find_unique_abbrev, which will be handy in later patches. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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