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xdiff/xhistogram: rework handling of recursed results

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Previously we were over-complicating matters by trying to combine the
recursed results. Now, terminate immediately if a recursive call failed
and return its result.

Signed-off-by: Tay Ray Chuan <rctay89@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Tay Ray Chuan 2011-08-01 12:20:08 +08:00 committed by Junio C Hamano
parent 739864b1ff
commit 19f7a9c577
1 changed files with 9 additions and 6 deletions
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7
xdiff/xhistogram.c
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@ -339,21 +339,24 @@ static int histogram_diff(xpparam_t const *xpp, xdfenv_t *env,
if (find_lcs(&index, &lcs, line1, count1, line2, count2))
result = fall_back_to_classic_diff(&index, line1, count1, line2, count2);
else {
result = 0;
if (lcs.begin1 == 0 && lcs.begin2 == 0) {
int ptr;
for (ptr = 0; ptr < count1; ptr++)
env->xdf1.rchg[line1 + ptr - 1] = 1;
for (ptr = 0; ptr < count2; ptr++)
env->xdf2.rchg[line2 + ptr - 1] = 1;
result = 0;
} else {
result = histogram_diff(xpp, env,
line1, lcs.begin1 - line1,
line2, lcs.begin2 - line2);
if (result)
goto cleanup;
result = histogram_diff(xpp, env,
lcs.end1 + 1, LINE_END(1) - lcs.end1,
lcs.end2 + 1, LINE_END(2) - lcs.end2);
result *= -1;
if (result)
goto cleanup;
}
}