1 files changed, 16 insertions, 0 deletions
diff --git a/lib/ldb/include/ldb.h b/lib/ldb/include/ldb.h
index 5d83a27..98859d4 100644
--- a/lib/ldb/include/ldb.h
+++ b/lib/ldb/include/ldb.h
@@ -2326,6 +2326,22 @@ do { \
 } while (0)
 #endif
 
+#ifndef NUMERIC_CMP
+/*
+ * NUMERIC_CMP is a safe replacement for `a - b` in comparison
+ * functions. It will work on integers, pointers, and floats.
+ *
+ * Rather than
+ *
+ *      return a - b;
+ *
+ * use
+ *
+ *     return NUMERIC_CMP(a, b);
+ */
+#define NUMERIC_CMP(a, b) (((a) > (b)) - ((a) < (b)))
+#endif
+
 
 
 /**