[src/trunk]: src/bin/expr Detect properly overflow in expr(1) for 0 + INT

[kamil <kamil%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/dc547b85e119
branches:  trunk
changeset: 319838:dc547b85e119
user:      kamil <kamil%NetBSD.org@localhost>
date:      Wed Jun 13 17:35:15 2018 +0000

description:
Detect properly overflow in expr(1) for 0 + INT

diffstat:

 bin/expr/expr.y |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (29 lines):

diff -r 032e7a1ce265 -r dc547b85e119 bin/expr/expr.y
--- a/bin/expr/expr.y   Wed Jun 13 17:32:29 2018 +0000
+++ b/bin/expr/expr.y   Wed Jun 13 17:35:15 2018 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: expr.y,v 1.40 2018/06/12 18:12:18 kamil Exp $ */
+/* $NetBSD: expr.y,v 1.41 2018/06/13 17:35:15 kamil Exp $ */
 
 /*_
  * Copyright (c) 2000 The NetBSD Foundation, Inc.
@@ -32,7 +32,7 @@
 %{
 #include <sys/cdefs.h>
 #ifndef lint
-__RCSID("$NetBSD: expr.y,v 1.40 2018/06/12 18:12:18 kamil Exp $");
+__RCSID("$NetBSD: expr.y,v 1.41 2018/06/13 17:35:15 kamil Exp $");
 #endif /* not lint */
 
 #include <sys/types.h>
@@ -309,8 +309,8 @@
                /*
                 * Check for over-& underflow.
                 */
-               if ((l > 0 && r <= INT64_MAX - l) ||
-                   (l < 0 && r >= INT64_MIN - l)) {
+               if ((l >= 0 && r <= INT64_MAX - l) ||
+                   (l <= 0 && r >= INT64_MIN - l)) {
                        res = l + r;
                } else {
                        yyerror("integer overflow or underflow occurred for "