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-rw-r--r--diff.c2
-rw-r--r--diffcore-rename.c19
-rw-r--r--wt-status.c1
3 files changed, 19 insertions, 3 deletions
diff --git a/diff.c b/diff.c
index 1aca5df..0ee9ea1 100644
--- a/diff.c
+++ b/diff.c
@@ -17,7 +17,7 @@
#endif
static int diff_detect_rename_default;
-static int diff_rename_limit_default = -1;
+static int diff_rename_limit_default = 100;
static int diff_use_color_default;
int diff_auto_refresh_index = 1;
diff --git a/diffcore-rename.c b/diffcore-rename.c
index 6bde439..41b35c3 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -298,10 +298,25 @@ void diffcore_rename(struct diff_options *options)
else if (detect_rename == DIFF_DETECT_COPY)
register_rename_src(p->one, 1, p->score);
}
- if (rename_dst_nr == 0 || rename_src_nr == 0 ||
- (0 < rename_limit && rename_limit < rename_dst_nr))
+ if (rename_dst_nr == 0 || rename_src_nr == 0)
goto cleanup; /* nothing to do */
+ /*
+ * This basically does a test for the rename matrix not
+ * growing larger than a "rename_limit" square matrix, ie:
+ *
+ * rename_dst_nr * rename_src_nr > rename_limit * rename_limit
+ *
+ * but handles the potential overflow case specially (and we
+ * assume at least 32-bit integers)
+ */
+ if (rename_limit <= 0 || rename_limit > 32767)
+ rename_limit = 32767;
+ if (rename_dst_nr > rename_limit && rename_src_nr > rename_limit)
+ goto cleanup;
+ if (rename_dst_nr * rename_src_nr > rename_limit * rename_limit)
+ goto cleanup;
+
/* We really want to cull the candidates list early
* with cheap tests in order to avoid doing deltas.
* The first round matches up the up-to-date entries,
diff --git a/wt-status.c b/wt-status.c
index 5205420..10ce6ee 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -227,6 +227,7 @@ static void wt_status_print_updated(struct wt_status *s)
rev.diffopt.format_callback = wt_status_print_updated_cb;
rev.diffopt.format_callback_data = s;
rev.diffopt.detect_rename = 1;
+ rev.diffopt.rename_limit = 100;
wt_read_cache(s);
run_diff_index(&rev, 1);
}