When checking for an encoded character, make sure the string isn't blank, first.

(Closes issue #13470)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@142748 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/app.c

@@ -1748,6 +1748,11 @@ int ast_get_encoded_char(const char *stream, char *result, size_t *consumed)
 	int i;
 	*consumed = 1;
 	*result = 0;
+	if (ast_strlen_zero(stream)) {
+		*consumed = 0;
+		return -1;
+	}
+
 	if (*stream == '\\') {
 		*consumed = 2;
 		switch (*(stream + 1)) {