Function ttydisc_rubword

freebsd/kern/tty_ttydisc.c:822–852

}

static void
ttydisc_rubword(struct tty *tp)
{
	char c;
	int quote, alnum;

	/* Strip whitespace first. */
	for (;;) {
		if (ttyinq_peekchar(&tp->t_inq, &c, &quote) != 0)
			return;
		if (!CTL_WHITE(c))
			break;
		ttydisc_rubchar(tp);
	}

	/*
	 * Record whether the last character from the previous iteration
	 * was alphanumeric or not. We need this to implement ALTWERASE.
	 */
	alnum = CTL_ALNUM(c);
	for (;;) {
		ttydisc_rubchar(tp);

		if (ttyinq_peekchar(&tp->t_inq, &c, &quote) != 0)
			return;
		if (CTL_WHITE(c))
			return;
		if (CMP_FLAG(l, ALTWERASE) && CTL_ALNUM(c) != alnum)
			return;
	}
}

int
ttydisc_rint(struct tty *tp, char c, int flags)