--- libelwix/src/json.c	2018/04/19 16:13:48	1.6
+++ libelwix/src/json.c	2018/06/26 14:39:13	1.7
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: json.c,v 1.6 2018/04/19 16:13:48 misho Exp $
+* $Id: json.c,v 1.7 2018/06/26 14:39:13 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -1017,6 +1017,48 @@ json_add_pair(char * __restrict jstr, int jlen, int ws
 		return -1;
 	}
 	if ((len = json_add_string(jstr, jlen, 0, val)) == -1) {
+		jstr[eos] = 0;
+		return -1;
+	}
+
+	return len;
+}
+
+/*
+ * json_add_pair2() - Adds key/value pair with formated args
+ *
+ * @jstr = JSON string
+ * @jlen = JSON string length
+ * @wspace = whitespace include
+ * @key = Key string
+ * @fmt = Format string for values
+ * return: -1 error or !=-1 actual JSON string length
+ */
+int
+json_add_pair2(char * __restrict jstr, int jlen, int wspace, const char *key, const char *fmt, ...)
+{
+	int len = -1;
+	size_t eos;
+	va_list lst;
+	char szStr[BUFSIZ] = { [0 ... BUFSIZ - 1] = 0 };
+
+	if (!jstr || !key || !fmt)
+		return -1;
+	else
+		eos = strlen(jstr);
+
+	if (json_add_string(jstr, jlen, 0, key) == -1) {
+		jstr[eos] = 0;
+		return -1;
+	}
+	if (json_add_colon(jstr, jlen, wspace) == -1) {
+		jstr[eos] = 0;
+		return -1;
+	}
+	va_start(lst, fmt);
+	vsnprintf(szStr, sizeof szStr, fmt, lst);
+	va_end(lst);
+	if ((len = json_add_string(jstr, jlen, 0, szStr)) == -1) {
 		jstr[eos] = 0;
 		return -1;
 	}