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-rw-r--r--diff-lib.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/diff-lib.c b/diff-lib.c
index b73cc1859a..b0c383647d 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -116,6 +116,10 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
if (!ce_path_match(istate, ce, &revs->prune_data, NULL))
continue;
+ if (revs->diffopt.prefix &&
+ strncmp(ce->name, revs->diffopt.prefix, revs->diffopt.prefix_length))
+ continue;
+
if (ce_stage(ce)) {
struct combine_diff_path *dpath;
struct diff_filepair *pair;