Add libteken (from FreeBSD) to third_party.

third_party/libteken/teken/teken_subr.h

Index: third_party/libteken/teken/teken_subr.h
diff --git a/third_party/libteken/teken/teken_subr.h b/third_party/libteken/teken/teken_subr.h
new file mode 100644
index 0000000000000000000000000000000000000000..5dea10bc59b3e60df404f8d798187f19e88383e3
--- /dev/null
+++ b/third_party/libteken/teken/teken_subr.h
@@ -0,0 +1,1306 @@
+/*-
+ * Copyright (c) 2008-2009 Ed Schouten <ed@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD: head/sys/teken/teken_subr.h 259761 2013-12-23 05:47:27Z ed $
+ */
+
+static void teken_subr_cursor_up(teken_t *, unsigned int);
+static void teken_subr_erase_line(teken_t *, unsigned int);
+static void teken_subr_regular_character(teken_t *, teken_char_t);
+static void teken_subr_reset_to_initial_state(teken_t *);
+static void teken_subr_save_cursor(teken_t *);
+
+static inline int
+teken_tab_isset(teken_t *t, unsigned int col)
+{
+	unsigned int b, o;
+
+	if (col >= T_NUMCOL)
+		return ((col % 8) == 0);
+
+	b = col / (sizeof(unsigned int) * 8);
+	o = col % (sizeof(unsigned int) * 8);
+
+	return (t->t_tabstops[b] & (1 << o));
+}
+
+static inline void
+teken_tab_clear(teken_t *t, unsigned int col)
+{
+	unsigned int b, o;
+
+	if (col >= T_NUMCOL)
+		return;
+
+	b = col / (sizeof(unsigned int) * 8);
+	o = col % (sizeof(unsigned int) * 8);
+
+	t->t_tabstops[b] &= ~(1 << o);
+}
+
+static inline void
+teken_tab_set(teken_t *t, unsigned int col)
+{
+	unsigned int b, o;
+
+	if (col >= T_NUMCOL)
+		return;
+
+	b = col / (sizeof(unsigned int) * 8);
+	o = col % (sizeof(unsigned int) * 8);
+
+	t->t_tabstops[b] |= 1 << o;
+}
+
+static void
+teken_tab_default(teken_t *t)
+{
+	unsigned int i;
+
+	memset(&t->t_tabstops, 0, T_NUMCOL / 8);
+
+	for (i = 8; i < T_NUMCOL; i += 8)
+		teken_tab_set(t, i);
+}
+
+static void
+teken_subr_do_scroll(teken_t *t, int amount)
+{
+	teken_rect_t tr;
+	teken_pos_t tp;
+
+	teken_assert(t->t_cursor.tp_row <= t->t_winsize.tp_row);
+	teken_assert(t->t_scrollreg.ts_end <= t->t_winsize.tp_row);
+	teken_assert(amount != 0);
+
+	/* Copy existing data 1 line up. */
+	if (amount > 0) {
+		/* Scroll down. */
+
+		/* Copy existing data up. */
+		if (t->t_scrollreg.ts_begin + amount < t->t_scrollreg.ts_end) {
+			tr.tr_begin.tp_row = t->t_scrollreg.ts_begin + amount;
+			tr.tr_begin.tp_col = 0;
+			tr.tr_end.tp_row = t->t_scrollreg.ts_end;
+			tr.tr_end.tp_col = t->t_winsize.tp_col;
+			tp.tp_row = t->t_scrollreg.ts_begin;
+			tp.tp_col = 0;
+			teken_funcs_copy(t, &tr, &tp);
+
+			tr.tr_begin.tp_row = t->t_scrollreg.ts_end - amount;
+		} else {
+			tr.tr_begin.tp_row = t->t_scrollreg.ts_begin;
+		}
+
+		/* Clear the last lines. */
+		tr.tr_begin.tp_col = 0;
+		tr.tr_end.tp_row = t->t_scrollreg.ts_end;
+		tr.tr_end.tp_col = t->t_winsize.tp_col;
+		teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+	} else {
+		/* Scroll up. */
+		amount = -amount;
+
+		/* Copy existing data down. */
+		if (t->t_scrollreg.ts_begin + amount < t->t_scrollreg.ts_end) {
+			tr.tr_begin.tp_row = t->t_scrollreg.ts_begin;
+			tr.tr_begin.tp_col = 0;
+			tr.tr_end.tp_row = t->t_scrollreg.ts_end - amount;
+			tr.tr_end.tp_col = t->t_winsize.tp_col;
+			tp.tp_row = t->t_scrollreg.ts_begin + amount;
+			tp.tp_col = 0;
+			teken_funcs_copy(t, &tr, &tp);
+
+			tr.tr_end.tp_row = t->t_scrollreg.ts_begin + amount;
+		} else {
+			tr.tr_end.tp_row = t->t_scrollreg.ts_end;
+		}
+
+		/* Clear the first lines. */
+		tr.tr_begin.tp_row = t->t_scrollreg.ts_begin;
+		tr.tr_begin.tp_col = 0;
+		tr.tr_end.tp_col = t->t_winsize.tp_col;
+		teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+	}
+}
+
+static ssize_t
+teken_subr_do_cpr(teken_t *t, unsigned int cmd, char response[16])
+{
+
+	switch (cmd) {
+	case 5: /* Operating status. */
+		strcpy(response, "0n");
+		return (2);
+	case 6: { /* Cursor position. */
+		int len;
+
+		len = snprintf(response, 16, "%u;%uR",
+		    (t->t_cursor.tp_row - t->t_originreg.ts_begin) + 1,
+		    t->t_cursor.tp_col + 1);
+
+		if (len >= 16)
+			return (-1);
+		return (len);
+	}
+	case 15: /* Printer status. */
+		strcpy(response, "13n");
+		return (3);
+	case 25: /* UDK status. */
+		strcpy(response, "20n");
+		return (3);
+	case 26: /* Keyboard status. */
+		strcpy(response, "27;1n");
+		return (5);
+	default:
+		teken_printf("Unknown DSR\n");
+		return (-1);
+	}
+}
+
+static void
+teken_subr_alignment_test(teken_t *t)
+{
+	teken_rect_t tr;
+
+	t->t_cursor.tp_row = t->t_cursor.tp_col = 0;
+	t->t_scrollreg.ts_begin = 0;
+	t->t_scrollreg.ts_end = t->t_winsize.tp_row;
+	t->t_originreg = t->t_scrollreg;
+	t->t_stateflags &= ~(TS_WRAPPED|TS_ORIGIN);
+	teken_funcs_cursor(t);
+
+	tr.tr_begin.tp_row = 0;
+	tr.tr_begin.tp_col = 0;
+	tr.tr_end = t->t_winsize;
+	teken_funcs_fill(t, &tr, 'E', &t->t_defattr);
+}
+
+static void
+teken_subr_backspace(teken_t *t)
+{
+
+	if (t->t_stateflags & TS_CONS25) {
+		if (t->t_cursor.tp_col == 0) {
+			if (t->t_cursor.tp_row == t->t_originreg.ts_begin)
+				return;
+			t->t_cursor.tp_row--;
+			t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
+		} else {
+			t->t_cursor.tp_col--;
+		}
+	} else {
+		if (t->t_cursor.tp_col == 0)
+			return;
+
+		t->t_cursor.tp_col--;
+		t->t_stateflags &= ~TS_WRAPPED;
+	}
+
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_bell(teken_t *t)
+{
+
+	teken_funcs_bell(t);
+}
+
+static void
+teken_subr_carriage_return(teken_t *t)
+{
+
+	t->t_cursor.tp_col = 0;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_backward(teken_t *t, unsigned int ncols)
+{
+
+	if (ncols > t->t_cursor.tp_col)
+		t->t_cursor.tp_col = 0;
+	else
+		t->t_cursor.tp_col -= ncols;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_backward_tabulation(teken_t *t, unsigned int ntabs)
+{
+
+	do {
+		/* Stop when we've reached the beginning of the line. */
+		if (t->t_cursor.tp_col == 0)
+			break;
+
+		t->t_cursor.tp_col--;
+
+		/* Tab marker set. */
+		if (teken_tab_isset(t, t->t_cursor.tp_col))
+			ntabs--;
+	} while (ntabs > 0);
+
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_down(teken_t *t, unsigned int nrows)
+{
+
+	if (t->t_cursor.tp_row + nrows >= t->t_scrollreg.ts_end)
+		t->t_cursor.tp_row = t->t_scrollreg.ts_end - 1;
+	else
+		t->t_cursor.tp_row += nrows;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_forward(teken_t *t, unsigned int ncols)
+{
+
+	if (t->t_cursor.tp_col + ncols >= t->t_winsize.tp_col)
+		t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
+	else
+		t->t_cursor.tp_col += ncols;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_forward_tabulation(teken_t *t, unsigned int ntabs)
+{
+
+	do {
+		/* Stop when we've reached the end of the line. */
+		if (t->t_cursor.tp_col == t->t_winsize.tp_col - 1)
+			break;
+
+		t->t_cursor.tp_col++;
+
+		/* Tab marker set. */
+		if (teken_tab_isset(t, t->t_cursor.tp_col))
+			ntabs--;
+	} while (ntabs > 0);
+
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_next_line(teken_t *t, unsigned int ncols)
+{
+
+	t->t_cursor.tp_col = 0;
+	teken_subr_cursor_down(t, ncols);
+}
+
+static void
+teken_subr_cursor_position(teken_t *t, unsigned int row, unsigned int col)
+{
+
+	t->t_cursor.tp_row = t->t_originreg.ts_begin + row - 1;
+	if (t->t_cursor.tp_row >= t->t_originreg.ts_end)
+		t->t_cursor.tp_row = t->t_originreg.ts_end - 1;
+
+	t->t_cursor.tp_col = col - 1;
+	if (t->t_cursor.tp_col >= t->t_winsize.tp_col)
+		t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
+
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_position_report(teken_t *t, unsigned int cmd)
+{
+	char response[18] = "\x1B[";
+	ssize_t len;
+
+	len = teken_subr_do_cpr(t, cmd, response + 2);
+	if (len < 0)
+		return;
+
+	teken_funcs_respond(t, response, len + 2);
+}
+
+static void
+teken_subr_cursor_previous_line(teken_t *t, unsigned int ncols)
+{
+
+	t->t_cursor.tp_col = 0;
+	teken_subr_cursor_up(t, ncols);
+}
+
+static void
+teken_subr_cursor_up(teken_t *t, unsigned int nrows)
+{
+
+	if (t->t_scrollreg.ts_begin + nrows >= t->t_cursor.tp_row)
+		t->t_cursor.tp_row = t->t_scrollreg.ts_begin;
+	else
+		t->t_cursor.tp_row -= nrows;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_delete_character(teken_t *t, unsigned int ncols)
+{
+	teken_rect_t tr;
+
+	tr.tr_begin.tp_row = t->t_cursor.tp_row;
+	tr.tr_end.tp_row = t->t_cursor.tp_row + 1;
+	tr.tr_end.tp_col = t->t_winsize.tp_col;
+
+	if (t->t_cursor.tp_col + ncols >= t->t_winsize.tp_col) {
+		tr.tr_begin.tp_col = t->t_cursor.tp_col;
+	} else {
+		/* Copy characters to the left. */
+		tr.tr_begin.tp_col = t->t_cursor.tp_col + ncols;
+		teken_funcs_copy(t, &tr, &t->t_cursor);
+
+		tr.tr_begin.tp_col = t->t_winsize.tp_col - ncols;
+	}
+
+	/* Blank trailing columns. */
+	teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_delete_line(teken_t *t, unsigned int nrows)
+{
+	teken_rect_t tr;
+
+	/* Ignore if outside scrolling region. */
+	if (t->t_cursor.tp_row < t->t_scrollreg.ts_begin ||
+	    t->t_cursor.tp_row >= t->t_scrollreg.ts_end)
+		return;
+
+	tr.tr_begin.tp_col = 0;
+	tr.tr_end.tp_row = t->t_scrollreg.ts_end;
+	tr.tr_end.tp_col = t->t_winsize.tp_col;
+
+	if (t->t_cursor.tp_row + nrows >= t->t_scrollreg.ts_end) {
+		tr.tr_begin.tp_row = t->t_cursor.tp_row;
+	} else {
+		teken_pos_t tp;
+
+		/* Copy rows up. */
+		tr.tr_begin.tp_row = t->t_cursor.tp_row + nrows;
+		tp.tp_row = t->t_cursor.tp_row;
+		tp.tp_col = 0;
+		teken_funcs_copy(t, &tr, &tp);
+
+		tr.tr_begin.tp_row = t->t_scrollreg.ts_end - nrows;
+	}
+
+	/* Blank trailing rows. */
+	teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_device_control_string(teken_t *t)
+{
+
+	teken_printf("Unsupported device control string\n");
+	t->t_stateflags |= TS_INSTRING;
+}
+
+static void
+teken_subr_device_status_report(teken_t *t, unsigned int cmd)
+{
+	char response[19] = "\x1B[?";
+	ssize_t len;
+
+	len = teken_subr_do_cpr(t, cmd, response + 3);
+	if (len < 0)
+		return;
+
+	teken_funcs_respond(t, response, len + 3);
+}
+
+static void
+teken_subr_double_height_double_width_line_top(teken_t *t __unused)
+{
+
+	teken_printf("double height double width top\n");
+}
+
+static void
+teken_subr_double_height_double_width_line_bottom(teken_t *t __unused)
+{
+
+	teken_printf("double height double width bottom\n");
+}
+
+static void
+teken_subr_erase_character(teken_t *t, unsigned int ncols)
+{
+	teken_rect_t tr;
+
+	tr.tr_begin = t->t_cursor;
+	tr.tr_end.tp_row = t->t_cursor.tp_row + 1;
+
+	if (t->t_cursor.tp_col + ncols >= t->t_winsize.tp_col)
+		tr.tr_end.tp_col = t->t_winsize.tp_col;
+	else
+		tr.tr_end.tp_col = t->t_cursor.tp_col + ncols;
+
+	teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_erase_display(teken_t *t, unsigned int mode)
+{
+	teken_rect_t r;
+
+	r.tr_begin.tp_col = 0;
+	r.tr_end.tp_col = t->t_winsize.tp_col;
+
+	switch (mode) {
+	case 1: /* Erase from the top to the cursor. */
+		teken_subr_erase_line(t, 1);
+
+		/* Erase lines above. */
+		if (t->t_cursor.tp_row == 0)
+			return;
+		r.tr_begin.tp_row = 0;
+		r.tr_end.tp_row = t->t_cursor.tp_row;
+		break;
+	case 2: /* Erase entire display. */
+		r.tr_begin.tp_row = 0;
+		r.tr_end.tp_row = t->t_winsize.tp_row;
+		break;
+	default: /* Erase from cursor to the bottom. */
+		teken_subr_erase_line(t, 0);
+
+		/* Erase lines below. */
+		if (t->t_cursor.tp_row == t->t_winsize.tp_row - 1)
+			return;
+		r.tr_begin.tp_row = t->t_cursor.tp_row + 1;
+		r.tr_end.tp_row = t->t_winsize.tp_row;
+		break;
+	}
+
+	teken_funcs_fill(t, &r, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_erase_line(teken_t *t, unsigned int mode)
+{
+	teken_rect_t r;
+
+	r.tr_begin.tp_row = t->t_cursor.tp_row;
+	r.tr_end.tp_row = t->t_cursor.tp_row + 1;
+
+	switch (mode) {
+	case 1: /* Erase from the beginning of the line to the cursor. */
+		r.tr_begin.tp_col = 0;
+		r.tr_end.tp_col = t->t_cursor.tp_col + 1;
+		break;
+	case 2: /* Erase entire line. */
+		r.tr_begin.tp_col = 0;
+		r.tr_end.tp_col = t->t_winsize.tp_col;
+		break;
+	default: /* Erase from cursor to the end of the line. */
+		r.tr_begin.tp_col = t->t_cursor.tp_col;
+		r.tr_end.tp_col = t->t_winsize.tp_col;
+		break;
+	}
+
+	teken_funcs_fill(t, &r, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_g0_scs_special_graphics(teken_t *t __unused)
+{
+
+	t->t_scs[0] = teken_scs_special_graphics;
+}
+
+static void
+teken_subr_g0_scs_uk_national(teken_t *t __unused)
+{
+
+	t->t_scs[0] = teken_scs_uk_national;
+}
+
+static void
+teken_subr_g0_scs_us_ascii(teken_t *t __unused)
+{
+
+	t->t_scs[0] = teken_scs_us_ascii;
+}
+
+static void
+teken_subr_g1_scs_special_graphics(teken_t *t __unused)
+{
+
+	t->t_scs[1] = teken_scs_special_graphics;
+}
+
+static void
+teken_subr_g1_scs_uk_national(teken_t *t __unused)
+{
+
+	t->t_scs[1] = teken_scs_uk_national;
+}
+
+static void
+teken_subr_g1_scs_us_ascii(teken_t *t __unused)
+{
+
+	t->t_scs[1] = teken_scs_us_ascii;
+}
+
+static void
+teken_subr_horizontal_position_absolute(teken_t *t, unsigned int col)
+{
+
+	t->t_cursor.tp_col = col - 1;
+	if (t->t_cursor.tp_col >= t->t_winsize.tp_col)
+		t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
+
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_horizontal_tab(teken_t *t)
+{
+
+	teken_subr_cursor_forward_tabulation(t, 1);
+}
+
+static void
+teken_subr_horizontal_tab_set(teken_t *t)
+{
+
+	teken_tab_set(t, t->t_cursor.tp_col);
+}
+
+static void
+teken_subr_index(teken_t *t)
+{
+
+	if (t->t_cursor.tp_row < t->t_scrollreg.ts_end - 1) {
+		t->t_cursor.tp_row++;
+		t->t_stateflags &= ~TS_WRAPPED;
+		teken_funcs_cursor(t);
+	} else {
+		teken_subr_do_scroll(t, 1);
+	}
+}
+
+static void
+teken_subr_insert_character(teken_t *t, unsigned int ncols)
+{
+	teken_rect_t tr;
+
+	tr.tr_begin = t->t_cursor;
+	tr.tr_end.tp_row = t->t_cursor.tp_row + 1;
+
+	if (t->t_cursor.tp_col + ncols >= t->t_winsize.tp_col) {
+		tr.tr_end.tp_col = t->t_winsize.tp_col;
+	} else {
+		teken_pos_t tp;
+
+		/* Copy characters to the right. */
+		tr.tr_end.tp_col = t->t_winsize.tp_col - ncols;
+		tp.tp_row = t->t_cursor.tp_row;
+		tp.tp_col = t->t_cursor.tp_col + ncols;
+		teken_funcs_copy(t, &tr, &tp);
+
+		tr.tr_end.tp_col = t->t_cursor.tp_col + ncols;
+	}
+
+	/* Blank current location. */
+	teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_insert_line(teken_t *t, unsigned int nrows)
+{
+	teken_rect_t tr;
+
+	/* Ignore if outside scrolling region. */
+	if (t->t_cursor.tp_row < t->t_scrollreg.ts_begin ||
+	    t->t_cursor.tp_row >= t->t_scrollreg.ts_end)
+		return;
+
+	tr.tr_begin.tp_row = t->t_cursor.tp_row;
+	tr.tr_begin.tp_col = 0;
+	tr.tr_end.tp_col = t->t_winsize.tp_col;
+
+	if (t->t_cursor.tp_row + nrows >= t->t_scrollreg.ts_end) {
+		tr.tr_end.tp_row = t->t_scrollreg.ts_end;
+	} else {
+		teken_pos_t tp;
+
+		/* Copy lines down. */
+		tr.tr_end.tp_row = t->t_scrollreg.ts_end - nrows;
+		tp.tp_row = t->t_cursor.tp_row + nrows;
+		tp.tp_col = 0;
+		teken_funcs_copy(t, &tr, &tp);
+
+		tr.tr_end.tp_row = t->t_cursor.tp_row + nrows;
+	}
+
+	/* Blank current location. */
+	teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_keypad_application_mode(teken_t *t)
+{
+
+	teken_funcs_param(t, TP_KEYPADAPP, 1);
+}
+
+static void
+teken_subr_keypad_numeric_mode(teken_t *t)
+{
+
+	teken_funcs_param(t, TP_KEYPADAPP, 0);
+}
+
+static void
+teken_subr_newline(teken_t *t)
+{
+
+	t->t_cursor.tp_row++;
+
+	if (t->t_cursor.tp_row >= t->t_scrollreg.ts_end) {
+		teken_subr_do_scroll(t, 1);
+		t->t_cursor.tp_row = t->t_scrollreg.ts_end - 1;
+	}
+
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_newpage(teken_t *t)
+{
+
+	if (t->t_stateflags & TS_CONS25) {
+		teken_rect_t tr;
+
+		/* Clear screen. */
+		tr.tr_begin.tp_row = t->t_originreg.ts_begin;
+		tr.tr_begin.tp_col = 0;
+		tr.tr_end.tp_row = t->t_originreg.ts_end;
+		tr.tr_end.tp_col = t->t_winsize.tp_col;
+		teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+
+		/* Cursor at top left. */
+		t->t_cursor.tp_row = t->t_originreg.ts_begin;
+		t->t_cursor.tp_col = 0;
+		t->t_stateflags &= ~TS_WRAPPED;
+		teken_funcs_cursor(t);
+	} else {
+		teken_subr_newline(t);
+	}
+}
+
+static void
+teken_subr_next_line(teken_t *t)
+{
+
+	t->t_cursor.tp_col = 0;
+	teken_subr_newline(t);
+}
+
+static void
+teken_subr_operating_system_command(teken_t *t)
+{
+
+	teken_printf("Unsupported operating system command\n");
+	t->t_stateflags |= TS_INSTRING;
+}
+
+static void
+teken_subr_pan_down(teken_t *t, unsigned int nrows)
+{
+
+	teken_subr_do_scroll(t, (int)nrows);
+}
+
+static void
+teken_subr_pan_up(teken_t *t, unsigned int nrows)
+{
+
+	teken_subr_do_scroll(t, -(int)nrows);
+}
+
+static void
+teken_subr_primary_device_attributes(teken_t *t, unsigned int request)
+{
+
+	if (request == 0) {
+		const char response[] = "\x1B[?1;2c";
+
+		teken_funcs_respond(t, response, sizeof response - 1);
+	} else {
+		teken_printf("Unknown DA1\n");
+	}
+}
+
+static void
+teken_subr_do_putchar(teken_t *t, const teken_pos_t *tp, teken_char_t c,
+    int width)
+{
+
+	if (t->t_stateflags & TS_INSERT &&
+	    tp->tp_col < t->t_winsize.tp_col - width) {
+		teken_rect_t ctr;
+		teken_pos_t ctp;
+
+		/* Insert mode. Move existing characters to the right. */
+		ctr.tr_begin = *tp;
+		ctr.tr_end.tp_row = tp->tp_row + 1;
+		ctr.tr_end.tp_col = t->t_winsize.tp_col - width;
+		ctp.tp_row = tp->tp_row;
+		ctp.tp_col = tp->tp_col + width;
+		teken_funcs_copy(t, &ctr, &ctp);
+	}
+
+	teken_funcs_putchar(t, tp, c, &t->t_curattr);
+
+	if (width == 2 && tp->tp_col + 1 < t->t_winsize.tp_col) {
+		teken_pos_t tp2;
+		teken_attr_t attr;
+
+		/* Print second half of CJK fullwidth character. */
+		tp2.tp_row = tp->tp_row;
+		tp2.tp_col = tp->tp_col + 1;
+		attr = t->t_curattr;
+		attr.ta_format |= TF_CJK_RIGHT;
+		teken_funcs_putchar(t, &tp2, c, &attr);
+	}
+}
+
+static void
+teken_subr_regular_character(teken_t *t, teken_char_t c)
+{
+	int width;
+
+	if (t->t_stateflags & TS_8BIT) {
+		if (!(t->t_stateflags & TS_CONS25) && (c <= 0x1b || c == 0x7f))
+			return;
+		c = teken_scs_process(t, c);
+		width = 1;
+	} else {
+		c = teken_scs_process(t, c);
+		width = teken_wcwidth(c);
+		/* XXX: Don't process zero-width characters yet. */
+		if (width <= 0)
+			return;
+	}
+
+	if (t->t_stateflags & TS_CONS25) {
+		teken_subr_do_putchar(t, &t->t_cursor, c, width);
+		t->t_cursor.tp_col += width;
+
+		if (t->t_cursor.tp_col >= t->t_winsize.tp_col) {
+			if (t->t_cursor.tp_row == t->t_scrollreg.ts_end - 1) {
+				/* Perform scrolling. */
+				teken_subr_do_scroll(t, 1);
+			} else {
+				/* No scrolling needed. */
+				if (t->t_cursor.tp_row <
+				    t->t_winsize.tp_row - 1)
+					t->t_cursor.tp_row++;
+			}
+			t->t_cursor.tp_col = 0;
+		}
+	} else if (t->t_stateflags & TS_AUTOWRAP &&
+	    ((t->t_stateflags & TS_WRAPPED &&
+	    t->t_cursor.tp_col + 1 == t->t_winsize.tp_col) ||
+	    t->t_cursor.tp_col + width > t->t_winsize.tp_col)) {
+		teken_pos_t tp;
+
+		/*
+		 * Perform line wrapping, if:
+		 * - Autowrapping is enabled, and
+		 *   - We're in the wrapped state at the last column, or
+		 *   - The character to be printed does not fit anymore.
+		 */
+		if (t->t_cursor.tp_row == t->t_scrollreg.ts_end - 1) {
+			/* Perform scrolling. */
+			teken_subr_do_scroll(t, 1);
+			tp.tp_row = t->t_scrollreg.ts_end - 1;
+		} else {
+			/* No scrolling needed. */
+			tp.tp_row = t->t_cursor.tp_row + 1;
+			if (tp.tp_row == t->t_winsize.tp_row) {
+				/*
+				 * Corner case: regular character
+				 * outside scrolling region, but at the
+				 * bottom of the screen.
+				 */
+				teken_subr_do_putchar(t, &t->t_cursor,
+				    c, width);
+				return;
+			}
+		}
+
+		tp.tp_col = 0;
+		teken_subr_do_putchar(t, &tp, c, width);
+
+		t->t_cursor.tp_row = tp.tp_row;
+		t->t_cursor.tp_col = width;
+		t->t_stateflags &= ~TS_WRAPPED;
+	} else {
+		/* No line wrapping needed. */
+		teken_subr_do_putchar(t, &t->t_cursor, c, width);
+		t->t_cursor.tp_col += width;
+
+		if (t->t_cursor.tp_col >= t->t_winsize.tp_col) {
+			t->t_stateflags |= TS_WRAPPED;
+			t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
+		} else {
+			t->t_stateflags &= ~TS_WRAPPED;
+		}
+	}
+
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_reset_dec_mode(teken_t *t, unsigned int cmd)
+{
+
+	switch (cmd) {
+	case 1: /* Cursor keys mode. */
+		t->t_stateflags &= ~TS_CURSORKEYS;
+		break;
+	case 2: /* DECANM: ANSI/VT52 mode. */
+		teken_printf("DECRST VT52\n");
+		break;
+	case 3: /* 132 column mode. */
+		teken_funcs_param(t, TP_132COLS, 0);
+		teken_subr_reset_to_initial_state(t);
+		break;
+	case 5: /* Inverse video. */
+		teken_printf("DECRST inverse video\n");
+		break;
+	case 6: /* Origin mode. */
+		t->t_stateflags &= ~TS_ORIGIN;
+		t->t_originreg.ts_begin = 0;
+		t->t_originreg.ts_end = t->t_winsize.tp_row;
+		t->t_cursor.tp_row = t->t_cursor.tp_col = 0;
+		t->t_stateflags &= ~TS_WRAPPED;
+		teken_funcs_cursor(t);
+		break;
+	case 7: /* Autowrap mode. */
+		t->t_stateflags &= ~TS_AUTOWRAP;
+		break;
+	case 8: /* Autorepeat mode. */
+		teken_funcs_param(t, TP_AUTOREPEAT, 0);
+		break;
+	case 25: /* Hide cursor. */
+		teken_funcs_param(t, TP_SHOWCURSOR, 0);
+		break;
+	case 40: /* Disallow 132 columns. */
+		teken_printf("DECRST allow 132\n");
+		break;
+	case 45: /* Disable reverse wraparound. */
+		teken_printf("DECRST reverse wraparound\n");
+		break;
+	case 47: /* Switch to alternate buffer. */
+		teken_printf("Switch to alternate buffer\n");
+		break;
+	case 1000: /* Mouse input. */
+		teken_funcs_param(t, TP_MOUSE, 0);
+		break;
+	default:
+		teken_printf("Unknown DECRST: %u\n", cmd);
+	}
+}
+
+static void
+teken_subr_reset_mode(teken_t *t, unsigned int cmd)
+{
+
+	switch (cmd) {
+	case 4:
+		t->t_stateflags &= ~TS_INSERT;
+		break;
+	default:
+		teken_printf("Unknown reset mode: %u\n", cmd);
+	}
+}
+
+static void
+teken_subr_do_resize(teken_t *t)
+{
+
+	t->t_scrollreg.ts_begin = 0;
+	t->t_scrollreg.ts_end = t->t_winsize.tp_row;
+	t->t_originreg = t->t_scrollreg;
+}
+
+static void
+teken_subr_do_reset(teken_t *t)
+{
+
+	t->t_curattr = t->t_defattr;
+	t->t_cursor.tp_row = t->t_cursor.tp_col = 0;
+	t->t_scrollreg.ts_begin = 0;
+	t->t_scrollreg.ts_end = t->t_winsize.tp_row;
+	t->t_originreg = t->t_scrollreg;
+	t->t_stateflags &= TS_8BIT|TS_CONS25;
+	t->t_stateflags |= TS_AUTOWRAP;
+
+	t->t_scs[0] = teken_scs_us_ascii;
+	t->t_scs[1] = teken_scs_us_ascii;
+	t->t_curscs = 0;
+
+	teken_subr_save_cursor(t);
+	teken_tab_default(t);
+}
+
+static void
+teken_subr_reset_to_initial_state(teken_t *t)
+{
+
+	teken_subr_do_reset(t);
+	teken_subr_erase_display(t, 2);
+	teken_funcs_param(t, TP_SHOWCURSOR, 1);
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_restore_cursor(teken_t *t)
+{
+
+	t->t_cursor = t->t_saved_cursor;
+	t->t_curattr = t->t_saved_curattr;
+	t->t_scs[t->t_curscs] = t->t_saved_curscs;
+	t->t_stateflags &= ~TS_WRAPPED;
+
+	/* Get out of origin mode when the cursor is moved outside. */
+	if (t->t_cursor.tp_row < t->t_originreg.ts_begin ||
+	    t->t_cursor.tp_row >= t->t_originreg.ts_end) {
+		t->t_stateflags &= ~TS_ORIGIN;
+		t->t_originreg.ts_begin = 0;
+		t->t_originreg.ts_end = t->t_winsize.tp_row;
+	}
+
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_reverse_index(teken_t *t)
+{
+
+	if (t->t_cursor.tp_row > t->t_scrollreg.ts_begin) {
+		t->t_cursor.tp_row--;
+		t->t_stateflags &= ~TS_WRAPPED;
+		teken_funcs_cursor(t);
+	} else {
+		teken_subr_do_scroll(t, -1);
+	}
+}
+
+static void
+teken_subr_save_cursor(teken_t *t)
+{
+
+	t->t_saved_cursor = t->t_cursor;
+	t->t_saved_curattr = t->t_curattr;
+	t->t_saved_curscs = t->t_scs[t->t_curscs];
+}
+
+static void
+teken_subr_secondary_device_attributes(teken_t *t, unsigned int request)
+{
+
+	if (request == 0) {
+		const char response[] = "\x1B[>0;10;0c";
+		teken_funcs_respond(t, response, sizeof response - 1);
+	} else {
+		teken_printf("Unknown DA2\n");
+	}
+}
+
+static void
+teken_subr_set_dec_mode(teken_t *t, unsigned int cmd)
+{
+
+	switch (cmd) {
+	case 1: /* Cursor keys mode. */
+		t->t_stateflags |= TS_CURSORKEYS;
+		break;
+	case 2: /* DECANM: ANSI/VT52 mode. */
+		teken_printf("DECSET VT52\n");
+		break;
+	case 3: /* 132 column mode. */
+		teken_funcs_param(t, TP_132COLS, 1);
+		teken_subr_reset_to_initial_state(t);
+		break;
+	case 5: /* Inverse video. */
+		teken_printf("DECSET inverse video\n");
+		break;
+	case 6: /* Origin mode. */
+		t->t_stateflags |= TS_ORIGIN;
+		t->t_originreg = t->t_scrollreg;
+		t->t_cursor.tp_row = t->t_scrollreg.ts_begin;
+		t->t_cursor.tp_col = 0;
+		t->t_stateflags &= ~TS_WRAPPED;
+		teken_funcs_cursor(t);
+		break;
+	case 7: /* Autowrap mode. */
+		t->t_stateflags |= TS_AUTOWRAP;
+		break;
+	case 8: /* Autorepeat mode. */
+		teken_funcs_param(t, TP_AUTOREPEAT, 1);
+		break;
+	case 25: /* Display cursor. */
+		teken_funcs_param(t, TP_SHOWCURSOR, 1);
+		break;
+	case 40: /* Allow 132 columns. */
+		teken_printf("DECSET allow 132\n");
+		break;
+	case 45: /* Enable reverse wraparound. */
+		teken_printf("DECSET reverse wraparound\n");
+		break;
+	case 47: /* Switch to alternate buffer. */
+		teken_printf("Switch away from alternate buffer\n");
+		break;
+	case 1000: /* Mouse input. */
+		teken_funcs_param(t, TP_MOUSE, 1);
+		break;
+	default:
+		teken_printf("Unknown DECSET: %u\n", cmd);
+	}
+}
+
+static void
+teken_subr_set_mode(teken_t *t, unsigned int cmd)
+{
+
+	switch (cmd) {
+	case 4:
+		teken_printf("Insert mode\n");
+		t->t_stateflags |= TS_INSERT;
+		break;
+	default:
+		teken_printf("Unknown set mode: %u\n", cmd);
+	}
+}
+
+static void
+teken_subr_set_graphic_rendition(teken_t *t, unsigned int ncmds,
+    unsigned int cmds[])
+{
+	unsigned int i, n;
+
+	/* No attributes means reset. */
+	if (ncmds == 0) {
+		t->t_curattr = t->t_defattr;
+		return;
+	}
+
+	for (i = 0; i < ncmds; i++) {
+		n = cmds[i];
+
+		switch (n) {
+		case 0: /* Reset. */
+			t->t_curattr = t->t_defattr;
+			break;
+		case 1: /* Bold. */
+			t->t_curattr.ta_format |= TF_BOLD;
+			break;
+		case 4: /* Underline. */
+			t->t_curattr.ta_format |= TF_UNDERLINE;
+			break;
+		case 5: /* Blink. */
+			t->t_curattr.ta_format |= TF_BLINK;
+			break;
+		case 7: /* Reverse. */
+			t->t_curattr.ta_format |= TF_REVERSE;
+			break;
+		case 22: /* Remove bold. */
+			t->t_curattr.ta_format &= ~TF_BOLD;
+			break;
+		case 24: /* Remove underline. */
+			t->t_curattr.ta_format &= ~TF_UNDERLINE;
+			break;
+		case 25: /* Remove blink. */
+			t->t_curattr.ta_format &= ~TF_BLINK;
+			break;
+		case 27: /* Remove reverse. */
+			t->t_curattr.ta_format &= ~TF_REVERSE;
+			break;
+		case 30: /* Set foreground color: black */
+		case 31: /* Set foreground color: red */
+		case 32: /* Set foreground color: green */
+		case 33: /* Set foreground color: brown */
+		case 34: /* Set foreground color: blue */
+		case 35: /* Set foreground color: magenta */
+		case 36: /* Set foreground color: cyan */
+		case 37: /* Set foreground color: white */
+			t->t_curattr.ta_fgcolor = n - 30;
+			break;
+		case 38: /* Set foreground color: 256 color mode */
+			if (i + 2 >= ncmds || cmds[i + 1] != 5)
+				continue;
+			t->t_curattr.ta_fgcolor = cmds[i + 2];
+			i += 2;
+			break;
+		case 39: /* Set default foreground color. */
+			t->t_curattr.ta_fgcolor = t->t_defattr.ta_fgcolor;
+			break;
+		case 40: /* Set background color: black */
+		case 41: /* Set background color: red */
+		case 42: /* Set background color: green */
+		case 43: /* Set background color: brown */
+		case 44: /* Set background color: blue */
+		case 45: /* Set background color: magenta */
+		case 46: /* Set background color: cyan */
+		case 47: /* Set background color: white */
+			t->t_curattr.ta_bgcolor = n - 40;
+			break;
+		case 48: /* Set background color: 256 color mode */
+			if (i + 2 >= ncmds || cmds[i + 1] != 5)
+				continue;
+			t->t_curattr.ta_bgcolor = cmds[i + 2];
+			i += 2;
+			break;
+		case 49: /* Set default background color. */
+			t->t_curattr.ta_bgcolor = t->t_defattr.ta_bgcolor;
+			break;
+		case 90: /* Set bright foreground color: black */
+		case 91: /* Set bright foreground color: red */
+		case 92: /* Set bright foreground color: green */
+		case 93: /* Set bright foreground color: brown */
+		case 94: /* Set bright foreground color: blue */
+		case 95: /* Set bright foreground color: magenta */
+		case 96: /* Set bright foreground color: cyan */
+		case 97: /* Set bright foreground color: white */
+			t->t_curattr.ta_fgcolor = n - 90 + 8;
+			break;
+		case 100: /* Set bright background color: black */
+		case 101: /* Set bright background color: red */
+		case 102: /* Set bright background color: green */
+		case 103: /* Set bright background color: brown */
+		case 104: /* Set bright background color: blue */
+		case 105: /* Set bright background color: magenta */
+		case 106: /* Set bright background color: cyan */
+		case 107: /* Set bright background color: white */
+			t->t_curattr.ta_bgcolor = n - 100 + 8;
+			break;
+		default:
+			teken_printf("unsupported attribute %u\n", n);
+		}
+	}
+}
+
+static void
+teken_subr_set_top_and_bottom_margins(teken_t *t, unsigned int top,
+    unsigned int bottom)
+{
+
+	/* Adjust top row number. */
+	if (top > 0)
+		top--;
+	/* Adjust bottom row number. */
+	if (bottom == 0 || bottom > t->t_winsize.tp_row)
+		bottom = t->t_winsize.tp_row;
+
+	/* Invalid arguments. */
+	if (top >= bottom - 1) {
+		top = 0;
+		bottom = t->t_winsize.tp_row;
+	}
+
+	/* Apply scrolling region. */
+	t->t_scrollreg.ts_begin = top;
+	t->t_scrollreg.ts_end = bottom;
+	if (t->t_stateflags & TS_ORIGIN)
+		t->t_originreg = t->t_scrollreg;
+
+	/* Home cursor to the top left of the scrolling region. */
+	t->t_cursor.tp_row = t->t_originreg.ts_begin;
+	t->t_cursor.tp_col = 0;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_single_height_double_width_line(teken_t *t __unused)
+{
+
+	teken_printf("single height double width???\n");
+}
+
+static void
+teken_subr_single_height_single_width_line(teken_t *t __unused)
+{
+
+	teken_printf("single height single width???\n");
+}
+
+static void
+teken_subr_string_terminator(teken_t *t __unused)
+{
+
+	/*
+	 * Strings are already terminated in teken_input_char() when ^[
+	 * is inserted.
+	 */
+}
+
+static void
+teken_subr_tab_clear(teken_t *t, unsigned int cmd)
+{
+
+	switch (cmd) {
+	case 0:
+		teken_tab_clear(t, t->t_cursor.tp_col);
+		break;
+	case 3:
+		memset(&t->t_tabstops, 0, T_NUMCOL / 8);
+		break;
+	}
+}
+
+static void
+teken_subr_vertical_position_absolute(teken_t *t, unsigned int row)
+{
+
+	t->t_cursor.tp_row = t->t_originreg.ts_begin + row - 1;
+	if (t->t_cursor.tp_row >= t->t_originreg.ts_end)
+		t->t_cursor.tp_row = t->t_originreg.ts_end - 1;
+
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}