diff options
Diffstat (limited to 'py/binary.c')
| -rw-r--r-- | py/binary.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/py/binary.c b/py/binary.c index 699324bc6..d22e0f342 100644 --- a/py/binary.c +++ b/py/binary.c @@ -294,9 +294,10 @@ void mp_binary_set_val(char struct_type, char val_type, mp_obj_t val_in, byte ** #endif { val = mp_obj_get_int(val_in); - // sign extend if needed - if (BYTES_PER_WORD < 8 && size > sizeof(val) && is_signed(val_type) && (mp_int_t)val < 0) { - memset(p + sizeof(val), 0xff, size - sizeof(val)); + // zero/sign extend if needed + if (BYTES_PER_WORD < 8 && size > sizeof(val)) { + int c = (is_signed(val_type) && (mp_int_t)val < 0) ? 0xff : 0x00; + memset(p + sizeof(val), c, size - sizeof(val)); } } } |