Fix api to treat an uninitialized value as AWK_UNDEFINED.

2 files changed, 10 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index a7b66969..99aee7af 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2014-11-09         Andrew J. Schorr     <aschorr@telemetry-investments.com>
+
+	* gawkapi.c (node_to_awk_value): When the type wanted is AWK_UNDEFINED
+	and a it's a Node_val set to Nnull_string, return AWK_UNDEFINED instead
+	of AWK_NUMBER 0.
+
 2014-11-03         Norihiro Tanaka       <noritnk@kcn.ne.jp>
 
 	* re.c (research): Use dfa superset to improve matching speed.
diff --git a/gawkapi.c b/gawkapi.c
index bcf8d90a..06f31929 100644
--- a/gawkapi.c
+++ b/gawkapi.c
@@ -441,7 +441,10 @@ node_to_awk_value(NODE *node, awk_value_t *val, awk_valtype_t wanted)
 
 		case AWK_UNDEFINED:
 			/* return true and actual type for request of undefined */
-			if ((node->flags & NUMBER) != 0) {
+			if (node == Nnull_string) {
+				val->val_type = AWK_UNDEFINED;
+				ret = awk_true;
+			} else if ((node->flags & NUMBER) != 0) {
 				val->val_type = AWK_NUMBER;
 				val->num_value = get_number_d(node);
 				ret = awk_true;