vis

commit 051bd8d56e3e9ee1a67613bd3a9760e55bf9470b
parent 4427d0f460356f192c1f449ca2eaefacaeea9ea3
Author: Marc André Tanner <mat@brain-dump.org>
Date:   Fri, 24 Jul 2015 21:47:55 +0200

text: add text_range_overlap

Diffstat:
M
text.c
 | 
6
++++++
M
text.h
 | 
2
++

2 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/text.c b/text.c
@@ -1496,3 +1496,9 @@ Filerange text_range_new(size_t a, size_t b) {
 		.end = MAX(a, b),
 	};
 }
+
+bool text_range_overlap(Filerange *r1, Filerange *r2) {
+	if (!text_range_valid(r1) || !text_range_valid(r2))
+		return false;
+	return r1->start <= r2->end && r2->start <= r1->end;
+}
diff --git a/text.h b/text.h
@@ -26,6 +26,8 @@ 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 overlap */
+bool text_range_overlap(Filerange*, Filerange*);
 
 typedef struct Text Text;
 typedef struct Piece Piece;