Function ttyinq_write

freebsd/kern/tty_inq.c:280–326

}

size_t
ttyinq_write(struct ttyinq *ti, const void *buf, size_t nbytes, int quote)
{
	const char *cbuf = buf;
	struct ttyinq_block *tib;
	unsigned int boff;
	size_t l;

	while (nbytes > 0) {
		boff = ti->ti_end % TTYINQ_DATASIZE;

		if (ti->ti_end == 0) {
			/* First time we're being used or drained. */
			MPASS(ti->ti_begin == 0);
			tib = ti->ti_firstblock;
			if (tib == NULL) {
				/* Queue has no blocks. */
				break;
			}
			ti->ti_lastblock = tib;
		} else if (boff == 0) {
			/* We reached the end of this block on last write. */
			tib = ti->ti_lastblock->tib_next;
			if (tib == NULL) {
				/* We've reached the watermark. */
				break;
			}
			ti->ti_lastblock = tib;
		} else {
			tib = ti->ti_lastblock;
		}

		/* Don't copy more than was requested. */
		l = MIN(nbytes, TTYINQ_DATASIZE - boff);
		MPASS(l > 0);
		memcpy(tib->tib_data + boff, cbuf, l);

		/* Set the quoting bits for the proper region. */
		ttyinq_set_quotes(tib, boff, l, quote);

		cbuf += l;
		nbytes -= l;
		ti->ti_end += l;
	}

	return (cbuf - (const char *)buf);
}

int
ttyinq_write_nofrag(struct ttyinq *ti, const void *buf, size_t nbytes, int quote)