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authorLibravatar Jeff King <peff@peff.net>2014-06-30 12:57:51 -0400
committerLibravatar Junio C Hamano <gitster@pobox.com>2014-06-30 13:43:16 -0700
commit35480f0b23f2c1824109ddae24392a70d19c6b9c (patch)
treeee2080bb4c9813223cacd5ef0287d437eb00058f /t/t7509-commit.sh
parentsha1_file: replace PATH_MAX buffer with strbuf in prepare_packed_git_one() (diff)
downloadtgif-35480f0b23f2c1824109ddae24392a70d19c6b9c.tar.xz
add strip_suffix function
Many callers of ends_with want to not only find out whether a string has a suffix, but want to also strip it off. Doing that separately has two minor problems: 1. We often run over the string twice (once to find the suffix, and then once more to find its length to subtract the suffix length). 2. We have to specify the suffix length again, which means either a magic number, or repeating ourselves with strlen("suffix"). Just as we have skip_prefix to avoid these cases with starts_with, we can add a strip_suffix to avoid them with ends_with. Note that we add two forms of strip_suffix here: one that takes a string, with the resulting length as an out-parameter; and one that takes a pointer/length pair, and reuses the length as an out-parameter. The latter is more efficient when the caller already has the length (e.g., when using strbufs), but it can be easy to confuse the two, as they take the same number and types of parameters. For that reason, the "mem" form puts its length parameter next to the buffer (since they are a pair), and the string form puts it at the end (since it is an out-parameter). The compiler can notice when you get the order wrong, which should help prevent writing one when you meant the other. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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