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-rw-r--r--range-diff.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/range-diff.c b/range-diff.c
index 3958720f00..48b0e1b4ce 100644
--- a/range-diff.c
+++ b/range-diff.c
@@ -460,8 +460,13 @@ int show_range_diff(const char *range1, const char *range2,
struct diff_options opts;
struct strbuf indent = STRBUF_INIT;
- memcpy(&opts, diffopt, sizeof(opts));
- opts.output_format = DIFF_FORMAT_PATCH;
+ if (diffopt)
+ memcpy(&opts, diffopt, sizeof(opts));
+ else
+ diff_setup(&opts);
+
+ if (!opts.output_format)
+ opts.output_format = DIFF_FORMAT_PATCH;
opts.flags.suppress_diff_headers = 1;
opts.flags.dual_color_diffed_diffs = dual_color;
opts.output_prefix = output_prefix_cb;