Maarten van der Schrieck 91ee8ac894 extmod/os_dupterm: Let mp_os_dupterm_tx_strn() return num bytes written.
In case of multiple outputs, the minimum successful write length is
returned.  In line with this, in case any output has a write error, zero is
returned.

In case of no outputs, -1 is returned.

The return value can be used to assess whether writes were attempted, and
if so, whether they succeeded.

Signed-off-by: Maarten van der Schrieck <maarten@thingsconnected.nl>
2023-12-22 10:26:52 +11:00
..
2019-10-29 14:17:29 +11:00
2017-07-18 11:57:39 +10:00