--- esP.py-	2016-09-09 00:00:00.000000000 +0900
+++ esP.py	2016-09-09 01:00:00.000000000 +0900
@@ -3,6 +3,12 @@
 import sys
 import yaml
 
+def printf(s, v):
+	sys.stdout.write(s % v)
+
+def atoi(s):
+	return eval(s)
+
 def is_num(s):
 	try:
 		float(s)
@@ -413,7 +419,7 @@ def do_expr(expr, info):
 	if k == 'name':
 		return get_env(info).get(v)
 	if k == 'br_s':
-		if v == '(':
+		if v in [ '(', '[' ]:  # '[' for do_arr()
 			e = expr[2][0]
 			return do_expr(e, info)
 		if v == '{':
@@ -442,6 +448,13 @@ def do_blk(blk, info):
 		if 'ret' in call_inf:
 			return
 
+def get_sys_func(name):
+	try:
+		func = eval(name)
+	except NameError:
+		return None
+	return func
+
 def do_fcall(name, args, info):
 	if info.get('verb') >= 1:
 		print('do_fcall() name={} args={}'.format(name, args))
@@ -451,6 +464,9 @@ def do_fcall(name, args, info):
 	f = lambda (k, nm): k == 'fdef' and nm == name
 	fdef = next( ( e for e in lst if f( e[:2] ) ), None )
 	if fdef is None:
+		func = get_sys_func(name)
+		if func:
+			return func(*args)
 		err_exit("not found fdef '{}'".format(name))
 
 	(args_info, ret_type, body) = fdef[2:]