1 files changed, 19 insertions, 0 deletions
diff --git a/text.c b/text.c
index 7cdfd03..3b73a62 100644
--- a/text.c
+++ b/text.c
@@ -1111,3 +1111,22 @@ int text_search_range_backward(Text *txt, size_t pos, size_t len, Regex *r, size
 	free(buf);
 	return ret;
 }
+
+bool text_range_valid(Filerange *r) {
+	return r->start != EPOS && r->end != EPOS && r->start <= r->end;
+}
+
+Filerange text_range_empty(void) {
+	return (Filerange){ .start = EPOS, .end = EPOS };
+}
+
+Filerange text_range_union(Filerange *r1, Filerange *r2) {
+	if (!text_range_valid(r1))
+		return *r2;
+	if (!text_range_valid(r2))
+		return *r1;
+	return (Filerange) {
+		.start = MIN(r1->start, r2->start),
+		.end = MAX(r1->end, r2->end),
+	};
+}