text-util: introduce text_range_equal

2 files changed, 8 insertions, 0 deletions

diff --git a/text-util.c b/text-util.c
index 38e49e1..2b48719 100644
--- a/text-util.c
+++ b/text-util.c
@@ -31,6 +31,12 @@ Filerange text_range_new(size_t a, size_t b) {
 	};
 }
 
+bool text_range_equal(Filerange *r1, Filerange *r2) {
+	if (!text_range_valid(r1) && !text_range_valid(r2))
+		return true;
+	return r1->start == r2->start && r1->end == r2->end;
+}
+
 bool text_range_overlap(Filerange *r1, Filerange *r2) {
 	if (!text_range_valid(r1) || !text_range_valid(r2))
 		return false;
diff --git a/text-util.h b/text-util.h
index 8e9eedb..80affd5 100644
--- a/text-util.h
+++ b/text-util.h
@@ -15,6 +15,8 @@ Filerange text_range_empty(void);
 Filerange text_range_union(Filerange*, Filerange*);
 /* create new range [min(a,b), max(a,b)] */
 Filerange text_range_new(size_t a, size_t b);
+/* test whether two ranges are equal */
+bool text_range_equal(Filerange*, Filerange*);
 /* test whether two ranges overlap */
 bool text_range_overlap(Filerange*, Filerange*);
 /* test whether a given position is within a certain range */