expand: Escape minus sign in arithmetic expansion

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

The minus sign generated from arithmetic expansion is currently
unquoted which causes anomalies when the result is used in where
the quoting matters.

This patch fixes it by explicitly calling memtodest for the minus
sign.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

diff --git a/src/expand.c b/src/expand.c
index c565646..a8bc142 100644
--- a/src/expand.c
+++ b/src/expand.c
@@ -490,6 +490,11 @@ expari(int flag)
 	result = arith(p + 1);
 	popstackmark(&sm);
 
+	if (result < 0) {
+		memtodest("-", 1, flag);
+		result = -result;
+	}
+
 	len = cvtnum(result);
 
 	if (likely(!(flag & EXP_QUOTED)))
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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