1 files changed, 6 insertions, 6 deletions

diff --git a/text-util.c b/text-util.c
index 4d3406b..6794a78 100644
--- a/text-util.c
+++ b/text-util.c
@@ -3,11 +3,11 @@
 #include <wchar.h>
 #include <errno.h>
 
-bool text_range_valid(Filerange *r) {
+bool text_range_valid(const Filerange *r) {
 	return r->start != EPOS && r->end != EPOS && r->start <= r->end;
 }
 
-size_t text_range_size(Filerange *r) {
+size_t text_range_size(const Filerange *r) {
 	return text_range_valid(r) ? r->end - r->start : 0;
 }
 
@@ -15,7 +15,7 @@ Filerange text_range_empty(void) {
 	return (Filerange){ .start = EPOS, .end = EPOS };
 }
 
-Filerange text_range_union(Filerange *r1, Filerange *r2) {
+Filerange text_range_union(const Filerange *r1, const Filerange *r2) {
 	if (!text_range_valid(r1))
 		return *r2;
 	if (!text_range_valid(r2))
@@ -33,19 +33,19 @@ Filerange text_range_new(size_t a, size_t b) {
 	};
 }
 
-bool text_range_equal(Filerange *r1, Filerange *r2) {
+bool text_range_equal(const Filerange *r1, const 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) {
+bool text_range_overlap(const Filerange *r1, const Filerange *r2) {
 	if (!text_range_valid(r1) || !text_range_valid(r2))
 		return false;
 	return r1->start <= r2->end && r2->start <= r1->end;
 }
 
-bool text_range_contains(Filerange *r, size_t pos) {
+bool text_range_contains(const Filerange *r, size_t pos) {
 	return text_range_valid(r) && r->start <= pos && pos <= r->end;
 }