From f53205fcfa3664184b4a8f18b12f4911f2a948d3 Mon Sep 17 00:00:00 2001
From: jilles <jilles@FreeBSD.org>
Date: Sat, 24 Aug 2013 20:06:00 +0000
Subject: sh: Reject ++ and -- in arithmetic.

POSIX does not require ++ and -- in arithmetic. It is probably more useful
to reject them than to treat ++x and --x as x silently.

Note that the behaviour of increment and decrement can be obtained via
(x+=1), ((x+=1)-1), (x-=1) and ((x-=1)+1).

PR:		bin/176444
---
 tools/regression/bin/sh/expansion/arith13.0 | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 tools/regression/bin/sh/expansion/arith13.0

(limited to 'tools/regression')

diff --git a/tools/regression/bin/sh/expansion/arith13.0 b/tools/regression/bin/sh/expansion/arith13.0
new file mode 100644
index 0000000..207e488
--- /dev/null
+++ b/tools/regression/bin/sh/expansion/arith13.0
@@ -0,0 +1,6 @@
+# $FreeBSD$
+# Pre-increment and pre-decrement in arithmetic expansion are not in POSIX.
+# Require either an error or a correct implementation.
+
+! (eval 'x=4; [ $((++x)) != 5 ] || [ $x != 5 ]') 2>/dev/null &&
+! (eval 'x=2; [ $((--x)) != 1 ] || [ $x != 1 ]') 2>/dev/null
-- 
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