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range_set: fix coalescing bug when range is a subset of another

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When coalescing ranges, sort_and_merge_range_set() unconditionally
assumes that the end of a range being folded into a preceding range
should become the end of the coalesced range. This assumption, however,
is invalid when one range is a subset of another.  For example, given
ranges 1-5 and 2-3 added via range_set_append_unsafe(),
sort_and_merge_range_set() incorrectly coalesces them to range 1-3
rather than the correct union range 1-5. Fix this bug.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Sunshine 2013-07-09 01:55:05 -04:00 committed by Junio C Hamano
parent 18d472db6f
commit 3755b53af7
2 changed files with 4 additions and 3 deletions
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3
line-log.c
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@ -116,7 +116,8 @@ static void sort_and_merge_range_set(struct range_set *rs)
for (i = 1; i < rs->nr; i++) {
if (rs->ranges[i].start <= rs->ranges[o-1].end) {
rs->ranges[o-1].end = rs->ranges[i].end;
if (rs->ranges[o-1].end < rs->ranges[i].end)
rs->ranges[o-1].end = rs->ranges[i].end;
} else {
rs->ranges[o].start = rs->ranges[i].start;
rs->ranges[o].end = rs->ranges[i].end;

4
t/t4211-line-log.sh
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@ -50,8 +50,8 @@ canned_test "-M -L ':f:b.c' parallel-change" parallel-change-f-to-main
canned_test "-L 4,12:a.c -L :main:a.c simple" multiple
canned_test "-L 4,18:a.c -L :main:a.c simple" multiple-overlapping
canned_test "-L :main:a.c -L 4,18:a.c simple" multiple-overlapping
canned_test_failure "-L 4:a.c -L 8,12:a.c simple" multiple-superset
canned_test_failure "-L 8,12:a.c -L 4:a.c simple" multiple-superset
canned_test "-L 4:a.c -L 8,12:a.c simple" multiple-superset
canned_test "-L 8,12:a.c -L 4:a.c simple" multiple-superset
test_bad_opts "-L" "switch.*requires a value"
test_bad_opts "-L b.c" "argument.*not of the form"