On Thu, 20 Dec 2007, Linus Torvalds wrote:
>
> And here's the git patch to avoid this optimization when there is
> context.
Actually, the code to finding one '\n' is still needed to avoid the
(pathological) case of getting a "\No newline", so scrap that one which
was too aggressive, and use this (simpler) one instead.
Not that it matters in real life, since nobody uses -U0, and "git blame"
won't care. But let's get it right anyway ;)
This whole function has had more bugs than it has lines.
Linus
---
xdiff-interface.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/xdiff-interface.c b/xdiff-interface.c
index 9ee877c..711029e 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -115,15 +115,18 @@ static void trim_common_tail(mmfile_t *a, mmfile_t *b, long ctx)
char *bp = b->ptr + b->size;
long smaller = (a->size < b->size) ? a->size : b->size;
+ if (ctx)
+ return;
+
while (blk + trimmed <= smaller && !memcmp(ap - blk, bp - blk, blk)) {
trimmed += blk;
ap -= blk;
bp -= blk;
}
- while (recovered < trimmed && 0 <= ctx)
+ while (recovered < trimmed)
if (ap[recovered++] == '\n')
- ctx--;
+ break;
a->size -= (trimmed - recovered);
b->size -= (trimmed - recovered);
}
--
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