commit - c620ba7f923e0e2cca34aeafbc93133ed727a052
commit + 54fa822893d2fcc170a2d3051d1640bf5303894e
blob - 073e0a21c0a312a7c09f13092e23da0decdec43a
blob + 94cc6fad7ecce1ff97127e1643d5ed82cb5ea3f0
--- include/diff/diff_main.h
+++ include/diff/diff_main.h
@@ -25,6 +25,43 @@
 
 #include <diff/arraylist.h>
 
+#ifndef MAX
+#define MAX(A,B) ((A)>(B)?(A):(B))
+#endif
+#ifndef MIN
+#define MIN(A,B) ((A)<(B)?(A):(B))
+#endif
+
+struct range {
+	int start;
+	int end;
+};
+
+static inline bool range_empty(const struct range *r)
+{
+	return r->start == r->end;
+}
+
+static inline bool ranges_touch(const struct range *a, const struct range *b)
+{
+	return (a->end >= b->start) && (a->start <= b->end);
+}
+
+static inline void ranges_merge(struct range *a, const struct range *b)
+{
+	*a = (struct range){
+		.start = MIN(a->start, b->start),
+		.end = MAX(a->end, b->end),
+	};
+}
+
+static inline int range_len(const struct range *r)
+{
+	if (!r)
+		return 0;
+	return r->end - r->start;
+}
+
 /* List of all possible return codes of a diff invocation. */
 enum diff_rc {
 	DIFF_RC_USE_DIFF_ALGO_FALLBACK = -1,
blob - d12e4c0b5d67538e6f0dbd89b84c22447ec44d25
blob + 986d06cbf5ec125bca1bfbce84d7cd3378501735
--- lib/diff_output_unidiff.c
+++ lib/diff_output_unidiff.c
@@ -42,32 +42,6 @@ static inline enum chunk_type chunk_type(const struct 
 	return CHUNK_SAME;
 }
 
-#define MAX(A,B) ((A)>(B)?(A):(B))
-#define MIN(A,B) ((A)<(B)?(A):(B))
-
-struct range {
-	int start;
-	int end;
-};
-
-static bool range_empty(const struct range *r)
-{
-	return r->start == r->end;
-}
-
-static bool ranges_touch(const struct range *a, const struct range *b)
-{
-	return (a->end >= b->start) && (a->start <= b->end);
-}
-
-static void ranges_merge(struct range *a, const struct range *b)
-{
-	*a = (struct range){
-		.start = MIN(a->start, b->start),
-		.end = MAX(a->end, b->end),
-	};
-}
-
 struct chunk_context {
 	struct range chunk;
 	struct range left, right;