1 files changed, 6 insertions, 6 deletions

diff --git a/src/intervals.h b/src/intervals.h
index db91b3f21a0..a0da6f37801 100644
--- a/src/intervals.h
+++ b/src/intervals.h
@@ -85,10 +85,10 @@ struct interval
 #define LEAF_INTERVAL_P(i) ((i)->left == NULL && (i)->right == NULL)
 
 /* True if this interval has no parent and is therefore the root.  */
-#define ROOT_INTERVAL_P(i) (NULL_PARENT (i))
+#define ROOT_INTERVAL_P(i) NULL_PARENT (i)
 
 /* True if this interval is the only interval in the interval tree.  */
-#define ONLY_INTERVAL_P(i) (ROOT_INTERVAL_P ((i)) && LEAF_INTERVAL_P ((i)))
+#define ONLY_INTERVAL_P(i) (ROOT_INTERVAL_P (i) && LEAF_INTERVAL_P (i))
 
 /* True if this interval has both left and right children.  */
 #define BOTH_KIDS_P(i) ((i)->left != NULL && (i)->right != NULL)
@@ -98,13 +98,13 @@ struct interval
 #define TOTAL_LENGTH(i) ((i) == NULL ? 0 : (i)->total_length)
 
 /* The size of text represented by this interval alone.  */
-#define LENGTH(i) ((i) == NULL ? 0 : (TOTAL_LENGTH ((i))                \
-                                      - TOTAL_LENGTH ((i)->right)       \
-                                      - TOTAL_LENGTH ((i)->left)))
+#define LENGTH(i) ((i)->total_length                    \
+                   - TOTAL_LENGTH ((i)->right)          \
+                   - TOTAL_LENGTH ((i)->left))
 
 /* The position of the character just past the end of I.  Note that
    the position cache i->position must be valid for this to work.  */
-#define INTERVAL_LAST_POS(i) ((i)->position + LENGTH ((i)))
+#define INTERVAL_LAST_POS(i) ((i)->position + LENGTH (i))
 
 /* The total size of the left subtree of this interval.  */
 #define LEFT_TOTAL_LENGTH(i) ((i)->left ? (i)->left->total_length : 0)