julian
81bc2e357c
Field bug (ICS XP-K200L over USB): text printed, barcode + cut missing; same bytes over TCP fine. sendRawUsb did ONE write() on an O_NONBLOCK usblp fd and never checked bytesWritten — the kernel accepts only what fits the printer's ~8 KB USB buffer and returns a short write, so the tail of any job bigger than one buffer (the barcode mid-payload, the cut at the end) was silently discarded. The regular-file test stand-in can't short-write, which is why tests never caught it. writeAllUsb now pushes 4 KB chunks until every byte is accepted, continues after partial writes, retries EAGAIN/zero-byte with a short pause, and fails at the deadline with an (N/M bytes) diagnostic. Driven by fake-handle tests (short writes, EAGAIN interleave, wedged-printer timeout, non-EAGAIN passthrough). Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V