+
+ /* PowerVM's vty implementation has a bug where it inserts a
+ * \0 after every \r going to the guest. Existing guests have
+ * a workaround for this which removes every \0 immediately
+ * following a \r, so here we make ourselves bug-for-bug
+ * compatible, so that the guest won't drop a real \0-after-\r
+ * that happens to occur in a binary stream. */
+ if (buf[n - 1] == '\r') {
+ if (n < max) {
+ buf[n++] = '\0';
+ } else {
+ /* No room for the extra \0, roll back and try again
+ * next time */
+ dev->out--;
+ n--;
+ break;
+ }
+ }