From: Heng Li <lh3@me.com>
Date: Fri, 20 Apr 2018 12:09:28 +0000 (-0400)
Subject: use more robust comparison in examples
X-Git-Url: http://www.kaiwu.me/postgresql/commit/static/gitweb.js?a=commitdiff_plain;h=e004dd2f1c2455cbd41b9b7ea317c76e6731f995;p=klib.git

use more robust comparison in examples
---

diff --git a/kavl.h b/kavl.h
index ee6c105..1041b86 100644
--- a/kavl.h
+++ b/kavl.h
@@ -34,7 +34,7 @@ struct my_node {
   char key;
   KAVL_HEAD(struct my_node) head;
 };
-#define my_cmp(p, q) ((p)->key - (q)->key)
+#define my_cmp(p, q) (((q)->key < (p)->key) - ((p)->key < (q)->key))
 KAVL_INIT(my, struct my_node, head, my_cmp)
 
 int main(void) {
diff --git a/test/kavl_test.c b/test/kavl_test.c
index 74123ce..e0a8221 100644
--- a/test/kavl_test.c
+++ b/test/kavl_test.c
@@ -11,7 +11,7 @@ struct my_node {
 	KAVL_HEAD(struct my_node) head;
 };
 
-#define my_cmp(p, q) ((p)->key - (q)->key)
+#define my_cmp(p, q) (((p)->key > (q)->key) - ((p)->key < (q)->key))
 KAVL_INIT(my, struct my_node, head, my_cmp)
 
 int check(struct my_node *p, int *hh)