py: Add mp_obj_str_builder_end_with_len.
This allows to create str's with a smaller length than initially asked
for.
diff --git a/py/objstr.c b/py/objstr.c
index 63d394e..321340e 100644
--- a/py/objstr.c
+++ b/py/objstr.c
@@ -1744,6 +1744,16 @@
return o;
}
+mp_obj_t mp_obj_str_builder_end_with_len(mp_obj_t o_in, mp_uint_t len) {
+ mp_obj_str_t *o = o_in;
+ o->data = m_renew(byte, (byte*)o->data, o->len + 1, len + 1);
+ o->len = len;
+ o->hash = qstr_compute_hash(o->data, o->len);
+ byte *p = (byte*)o->data;
+ p[o->len] = '\0'; // for now we add null for compatibility with C ASCIIZ strings
+ return o;
+}
+
mp_obj_t mp_obj_new_str_of_type(const mp_obj_type_t *type, const byte* data, uint len) {
mp_obj_str_t *o = m_new_obj(mp_obj_str_t);
o->base.type = type;