py: Add mp_obj_str_builder_end_with_len.

This allows to create str's with a smaller length than initially asked
for.

1 files changed, 1 insertions, 0 deletions

diff --git a/py/obj.h b/py/obj.h
index c391611c10..64ed061c8b 100644
--- a/py/obj.h
+++ b/py/obj.h
@@ -460,6 +460,7 @@ void mp_init_emergency_exception_buf(void);
 // str
 mp_obj_t mp_obj_str_builder_start(const mp_obj_type_t *type, uint len, byte **data);
 mp_obj_t mp_obj_str_builder_end(mp_obj_t o_in);
+mp_obj_t mp_obj_str_builder_end_with_len(mp_obj_t o_in, mp_uint_t len);
 bool mp_obj_str_equal(mp_obj_t s1, mp_obj_t s2);
 uint mp_obj_str_get_hash(mp_obj_t self_in);
 uint mp_obj_str_get_len(mp_obj_t self_in);