Replace syscons terminal renderer by a new renderer that uses libteken.

Some time ago I started working on a library called libteken, which is
terminal emulator. It does not buffer any screen contents, but only
keeps terminal state, such as cursor position, attributes, etc. It
should implement all escape sequences that are implemented by the
cons25 terminal emulator, but also a fair amount of sequences that are
present in VT100 and xterm.

A lot of random notes, which could be of interest to users/developers:

- Even though I'm leaving the terminal type set to `cons25', users can
  do experiments with placing `xterm-color' in /etc/ttys. Because we
  only implement a subset of features of xterm, this may cause
  artifacts. We should consider extending libteken, because in my
  opinion xterm is the way to go. Some missing features:

  - Keypad application mode (DECKPAM)
  - Character sets (SCS)

- libteken is filled with a fair amount of assertions, but unfortunately
  we cannot go into the debugger anymore if we fail them. I've done
  development of this library almost entirely in userspace. In
  sys/dev/syscons/teken there are two applications that can be helpful
  when debugging the code:

  - teken_demo: a terminal emulator that can be started from a regular
    xterm that emulates a terminal using libteken. This application can
    be very useful to debug any rendering issues.

  - teken_stress: a stress testing application that emulates random
    terminal output. libteken has literally survived multiple terabytes
    of random input.

- libteken also includes support for UTF-8, but unfortunately our input
  layer and font renderer don't support this. If users want to
  experiment with UTF-8 support, they can enable `TEKEN_UTF8' in
  teken.h. If you recompile your kernel or the teken_demo application,
  you can hold some nice experiments.

- I've left PC98 the way it is right now. The PC98 platform has a custom
  syscons renderer, which supports some form of localised input. Maybe
  we should port PC98 to libteken by the time syscons supports UTF-8?

- I've removed the `dumb' terminal emulator. It has been broken for
  years. It hasn't survived the `struct proc' -> `struct thread'
  conversion.

- To prevent confusion among people that want to hack on libteken:
  unlike syscons, the state machines that parse the escape sequences are
  machine generated. This means that if you want to add new escape
  sequences, you have to add an entry to the `sequences' file. This will
  cause new entries to be added to `teken_state.h'.

- Any rendering artifacts that didn't occur prior to this commit are by
  accident. They should be reported to me, so I can fix them.

Discussed on:	current@, hackers@
Discussed with:	philip (at 25C3)

1 files changed, 0 insertions, 811 deletions

diff --git a/sys/dev/syscons/scterm-sc.c b/sys/dev/syscons/scterm-sc.c
deleted file mode 100644
index b52bea8..0000000
--- a/sys/dev/syscons/scterm-sc.c
+++ /dev/null
@@ -1,811 +0,0 @@
-/*-
- * Copyright (c) 1999 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
- * Copyright (c) 1992-1998 Søren Schmidt
- * 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 as
- *    the first lines of this file unmodified.
- * 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 AUTHORS ``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 AUTHORS 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.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include "opt_syscons.h"
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/kernel.h>
-#include <sys/module.h>
-#include <sys/consio.h>
-
-#if defined(__sparc64__) || defined(__powerpc__)
-#include <machine/sc_machdep.h>
-#else
-#include <machine/pc/display.h>
-#endif
-
-#include <dev/syscons/syscons.h>
-#include <dev/syscons/sctermvar.h>
-
-#ifndef SC_DUMB_TERMINAL
-
-#define MAX_ESC_PAR	5
-
-/* attribute flags */
-typedef struct {
-	u_short		fg;			/* foreground color */
-	u_short		bg;			/* background color */
-} color_t;
-
-typedef struct {
-	int		flags;
-#define SCTERM_BUSY	(1 << 0)
-	int		esc;
-	int		num_param;
-	int		last_param;
-	int		param[MAX_ESC_PAR];
-	int		saved_xpos;
-	int		saved_ypos;
-	int		attr_mask;		/* current logical attr mask */
-#define NORMAL_ATTR	0x00
-#define BLINK_ATTR	0x01
-#define BOLD_ATTR	0x02
-#define UNDERLINE_ATTR	0x04
-#define REVERSE_ATTR	0x08
-#define FG_CHANGED	0x10
-#define BG_CHANGED	0x20
-	int		cur_attr;		/* current hardware attr word */
-	color_t		cur_color;		/* current hardware color */
-	color_t		std_color;		/* normal hardware color */
-	color_t		rev_color;		/* reverse hardware color */
-	color_t		dflt_std_color;		/* default normal color */
-	color_t		dflt_rev_color;		/* default reverse color */
-} term_stat;
-
-static sc_term_init_t	scterm_init;
-static sc_term_term_t	scterm_term;
-static sc_term_puts_t	scterm_puts;
-static sc_term_ioctl_t	scterm_ioctl;
-static sc_term_reset_t	scterm_reset;
-static sc_term_default_attr_t	scterm_default_attr;
-static sc_term_clear_t	scterm_clear;
-static sc_term_notify_t	scterm_notify;
-static sc_term_input_t	scterm_input;
-
-static sc_term_sw_t sc_term_sc = {
-	{ NULL, NULL },
-	"sc",					/* emulator name */
-	"syscons terminal",			/* description */
-	"*",					/* matching renderer, any :-) */
-	sizeof(term_stat),			/* softc size */
-	0,
-	scterm_init,
-	scterm_term,
-	scterm_puts,
-	scterm_ioctl,
-	scterm_reset,
-	scterm_default_attr,
-	scterm_clear,
-	scterm_notify,
-	scterm_input,
-};
-
-SCTERM_MODULE(sc, sc_term_sc);
-
-static term_stat	reserved_term_stat;
-static void		scterm_scan_esc(scr_stat *scp, term_stat *tcp,
-					u_char c);
-static int		mask2attr(term_stat *tcp);
-
-static int
-scterm_init(scr_stat *scp, void **softc, int code)
-{
-	term_stat *tcp;
-
-	if (*softc == NULL) {
-		if (reserved_term_stat.flags & SCTERM_BUSY)
-			return EINVAL;
-		*softc = &reserved_term_stat;
-	}
-	tcp = *softc;
-
-	switch (code) {
-	case SC_TE_COLD_INIT:
-		bzero(tcp, sizeof(*tcp));
-		tcp->flags = SCTERM_BUSY;
-		tcp->esc = 0;
-		tcp->saved_xpos = -1;
-		tcp->saved_ypos = -1;
-		tcp->attr_mask = NORMAL_ATTR;
-		/* XXX */
-		tcp->dflt_std_color.fg = SC_NORM_ATTR & 0x0f;
-		tcp->dflt_std_color.bg = (SC_NORM_ATTR >> 4) & 0x0f;
-		tcp->dflt_rev_color.fg = SC_NORM_REV_ATTR & 0x0f;
-		tcp->dflt_rev_color.bg = (SC_NORM_REV_ATTR >> 4) & 0x0f;
-		tcp->std_color = tcp->dflt_std_color;
-		tcp->rev_color = tcp->dflt_rev_color;
-		tcp->cur_color = tcp->std_color;
-		tcp->cur_attr = mask2attr(tcp);
-		++sc_term_sc.te_refcount;
-		break;
-
-	case SC_TE_WARM_INIT:
-		tcp->esc = 0;
-		tcp->saved_xpos = -1;
-		tcp->saved_ypos = -1;
-#if 0
-		tcp->std_color = tcp->dflt_std_color;
-		tcp->rev_color = tcp->dflt_rev_color;
-#endif
-		tcp->cur_color = tcp->std_color;
-		tcp->cur_attr = mask2attr(tcp);
-		break;
-	}
-
-	return 0;
-}
-
-static int
-scterm_term(scr_stat *scp, void **softc)
-{
-	if (*softc == &reserved_term_stat) {
-		*softc = NULL;
-		bzero(&reserved_term_stat, sizeof(reserved_term_stat));
-	}
-	--sc_term_sc.te_refcount;
-	return 0;
-}
-
-static void
-scterm_scan_esc(scr_stat *scp, term_stat *tcp, u_char c)
-{
-	static u_char ansi_col[16] = {
-		FG_BLACK,     FG_RED,          FG_GREEN,      FG_BROWN,
-		FG_BLUE,      FG_MAGENTA,      FG_CYAN,       FG_LIGHTGREY,
-		FG_DARKGREY,  FG_LIGHTRED,     FG_LIGHTGREEN, FG_YELLOW,
-		FG_LIGHTBLUE, FG_LIGHTMAGENTA, FG_LIGHTCYAN,  FG_WHITE
-	};
-	static int cattrs[] = {
-		0,					/* block */
-		CONS_BLINK_CURSOR,			/* blinking block */
-		CONS_CHAR_CURSOR,			/* underline */
-		CONS_CHAR_CURSOR | CONS_BLINK_CURSOR,	/* blinking underline */
-		CONS_RESET_CURSOR,			/* reset to default */
-		CONS_HIDDEN_CURSOR,			/* hide cursor */
-	};
-	static int tcattrs[] = {
-		CONS_RESET_CURSOR | CONS_LOCAL_CURSOR,	/* normal */
-		CONS_HIDDEN_CURSOR | CONS_LOCAL_CURSOR,	/* invisible */
-		CONS_BLINK_CURSOR | CONS_LOCAL_CURSOR,	/* very visible */
-	};
-	sc_softc_t *sc;
-	int v0, v1, v2;
-	int i, n;
-
-	i = n = 0;
-	sc = scp->sc; 
-	if (tcp->esc == 1) {	/* seen ESC */
-		switch (c) {
-
-		case '7':	/* Save cursor position */
-			tcp->saved_xpos = scp->xpos;
-			tcp->saved_ypos = scp->ypos;
-			break;
-
-		case '8':	/* Restore saved cursor position */
-			if (tcp->saved_xpos >= 0 && tcp->saved_ypos >= 0)
-				sc_move_cursor(scp, tcp->saved_xpos,
-					       tcp->saved_ypos);
-			break;
-
-		case '[':	/* Start ESC [ sequence */
-			tcp->esc = 2;
-			tcp->last_param = -1;
-			for (i = tcp->num_param; i < MAX_ESC_PAR; i++)
-				tcp->param[i] = 1;
-			tcp->num_param = 0;
-			return;
-
-		case 'M':	/* Move cursor up 1 line, scroll if at top */
-			sc_term_up_scroll(scp, 1, sc->scr_map[0x20],
-					  tcp->cur_attr, 0, 0);
-			break;
-#ifdef notyet
-		case 'Q':
-			tcp->esc = 4;
-			return;
-#endif
-		case 'c':       /* reset */
-			tcp->attr_mask = NORMAL_ATTR;
-			tcp->cur_color = tcp->std_color
-				       = tcp->dflt_std_color;
-			tcp->rev_color = tcp->dflt_rev_color;
-			tcp->cur_attr = mask2attr(tcp);
-			sc_change_cursor_shape(scp,
-			    CONS_RESET_CURSOR | CONS_LOCAL_CURSOR, -1, -1);
-			sc_clear_screen(scp);
-			break;
-
-		case '(':	/* iso-2022: designate 94 character set to G0 */
-			tcp->esc = 5;
-			return;
-		}
-	} else if (tcp->esc == 2) {	/* seen ESC [ */
-		if (c >= '0' && c <= '9') {
-			if (tcp->num_param < MAX_ESC_PAR) {
-				if (tcp->last_param != tcp->num_param) {
-					tcp->last_param = tcp->num_param;
-					tcp->param[tcp->num_param] = 0;
-				} else {
-					tcp->param[tcp->num_param] *= 10;
-				}
-				tcp->param[tcp->num_param] += c - '0';
-				return;
-			}
-		}
-		tcp->num_param = tcp->last_param + 1;
-		switch (c) {
-
-		case ';':
-			if (tcp->num_param < MAX_ESC_PAR)
-				return;
-			break;
-
-		case '=':
-			tcp->esc = 3;
-			tcp->last_param = -1;
-			for (i = tcp->num_param; i < MAX_ESC_PAR; i++)
-				tcp->param[i] = 1;
-			tcp->num_param = 0;
-			return;
-
-		case 'A':	/* up n rows */
-			sc_term_up(scp, tcp->param[0], 0);
-			break;
-
-		case 'B':	/* down n rows */
-			sc_term_down(scp, tcp->param[0], 0);
-			break;
-
-		case 'C':	/* right n columns */
-			sc_term_right(scp, tcp->param[0]);
-			break;
-
-		case 'D':	/* left n columns */
-			sc_term_left(scp, tcp->param[0]);
-			break;
-
-		case 'E':	/* cursor to start of line n lines down */
-			n = tcp->param[0];
-			if (n < 1)
-				n = 1;
-			sc_move_cursor(scp, 0, scp->ypos + n);
-			break;
-
-		case 'F':	/* cursor to start of line n lines up */
-			n = tcp->param[0];
-			if (n < 1)
-				n = 1;
-			sc_move_cursor(scp, 0, scp->ypos - n);
-			break;
-
-		case 'f':	/* Cursor move */
-		case 'H':
-			if (tcp->num_param == 0)
-				sc_move_cursor(scp, 0, 0);
-			else if (tcp->num_param == 2)
-				sc_move_cursor(scp, tcp->param[1] - 1,
-					       tcp->param[0] - 1);
-			break;
-
-		case 'J':	/* Clear all or part of display */
-			if (tcp->num_param == 0)
-				n = 0;
-			else
-				n = tcp->param[0];
-			sc_term_clr_eos(scp, n, sc->scr_map[0x20],
-					tcp->cur_attr);
-			break;
-
-		case 'K':	/* Clear all or part of line */
-			if (tcp->num_param == 0)
-				n = 0;
-			else
-				n = tcp->param[0];
-			sc_term_clr_eol(scp, n, sc->scr_map[0x20],
-					tcp->cur_attr);
-			break;
-
-		case 'L':	/* Insert n lines */
-			sc_term_ins_line(scp, scp->ypos, tcp->param[0],
-					 sc->scr_map[0x20], tcp->cur_attr, 0);
-			break;
-
-		case 'M':	/* Delete n lines */
-			sc_term_del_line(scp, scp->ypos, tcp->param[0],
-					 sc->scr_map[0x20], tcp->cur_attr, 0);
-			break;
-
-		case 'P':	/* Delete n chars */
-			sc_term_del_char(scp, tcp->param[0],
-					 sc->scr_map[0x20], tcp->cur_attr);
-			break;
-
-		case '@':	/* Insert n chars */
-			sc_term_ins_char(scp, tcp->param[0],
-					 sc->scr_map[0x20], tcp->cur_attr);
-			break;
-
-		case 'S':	/* scroll up n lines */
-			sc_term_del_line(scp, 0, tcp->param[0],
-					 sc->scr_map[0x20], tcp->cur_attr, 0);
-			break;
-
-		case 'T':	/* scroll down n lines */
-			sc_term_ins_line(scp, 0, tcp->param[0],
-					 sc->scr_map[0x20], tcp->cur_attr, 0);
-			break;
-
-		case 'X':	/* erase n characters in line */
-			n = tcp->param[0];
-			if (n < 1)
-				n = 1;
-			if (n > scp->xsize - scp->xpos)
-				n = scp->xsize - scp->xpos;
-			sc_vtb_erase(&scp->vtb, scp->cursor_pos, n,
-				     sc->scr_map[0x20], tcp->cur_attr);
-			mark_for_update(scp, scp->cursor_pos);
-			mark_for_update(scp, scp->cursor_pos + n - 1);
-			break;
-
-		case 'Z':	/* move n tabs backwards */
-			sc_term_backtab(scp, tcp->param[0]);
-			break;
-
-		case '`':	/* move cursor to column n */
-			sc_term_col(scp, tcp->param[0]);
-			break;
-
-		case 'a':	/* move cursor n columns to the right */
-			sc_term_right(scp, tcp->param[0]);
-			break;
-
-		case 'd':	/* move cursor to row n */
-			sc_term_row(scp, tcp->param[0]);
-			break;
-
-		case 'e':	/* move cursor n rows down */
-			sc_term_down(scp, tcp->param[0], 0);
-			break;
-
-		case 'm':	/* change attribute */
-			if (tcp->num_param == 0) {
-				tcp->attr_mask = NORMAL_ATTR;
-				tcp->cur_color = tcp->std_color;
-				tcp->cur_attr = mask2attr(tcp);
-				break;
-			}
-			for (i = 0; i < tcp->num_param; i++) {
-				switch (n = tcp->param[i]) {
-				case 0:	/* back to normal */
-					tcp->attr_mask = NORMAL_ATTR;
-					tcp->cur_color = tcp->std_color;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 1:	/* bold */
-					tcp->attr_mask |= BOLD_ATTR;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 4:	/* underline */
-					tcp->attr_mask |= UNDERLINE_ATTR;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 5:	/* blink */
-					tcp->attr_mask |= BLINK_ATTR;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 7: /* reverse */
-					tcp->attr_mask |= REVERSE_ATTR;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 22: /* remove bold (or dim) */
-					tcp->attr_mask &= ~BOLD_ATTR;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 24: /* remove underline */
-					tcp->attr_mask &= ~UNDERLINE_ATTR;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 25: /* remove blink */
-					tcp->attr_mask &= ~BLINK_ATTR;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 27: /* remove reverse */
-					tcp->attr_mask &= ~REVERSE_ATTR;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 30: case 31: /* set ansi fg color */
-				case 32: case 33: case 34:
-				case 35: case 36: case 37:
-					tcp->attr_mask |= FG_CHANGED;
-					tcp->cur_color.fg = ansi_col[n - 30];
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 39: /* restore fg color back to normal */
-					tcp->attr_mask &= ~(FG_CHANGED|BOLD_ATTR);
-					tcp->cur_color.fg = tcp->std_color.fg;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				case 40: case 41: /* set ansi bg color */
-				case 42: case 43: case 44:
-				case 45: case 46: case 47:
-					tcp->attr_mask |= BG_CHANGED;
-					tcp->cur_color.bg = ansi_col[n - 40];
-					tcp->cur_attr = mask2attr(tcp);
-		    			break;
-				case 49: /* restore bg color back to normal */
-					tcp->attr_mask &= ~BG_CHANGED;
-					tcp->cur_color.bg = tcp->std_color.bg;
-					tcp->cur_attr = mask2attr(tcp);
-					break;
-				}
-			}
-			break;
-
-		case 's':	/* Save cursor position */
-			tcp->saved_xpos = scp->xpos;
-			tcp->saved_ypos = scp->ypos;
-			break;
-
-		case 'u':	/* Restore saved cursor position */
-			if (tcp->saved_xpos >= 0 && tcp->saved_ypos >= 0)
-				sc_move_cursor(scp, tcp->saved_xpos,
-					       tcp->saved_ypos);
-			break;
-
-		case 'x':
-			if (tcp->num_param == 0)
-				n = 0;
-			else
-				n = tcp->param[0];
-			switch (n) {
-			case 0: /* reset colors and attributes back to normal */
-				tcp->attr_mask = NORMAL_ATTR;
-				tcp->cur_color = tcp->std_color
-					       = tcp->dflt_std_color;
-				tcp->rev_color = tcp->dflt_rev_color;
-				tcp->cur_attr = mask2attr(tcp);
-				break;
-			case 1:	/* set ansi background */
-				tcp->attr_mask &= ~BG_CHANGED;
-				tcp->cur_color.bg = tcp->std_color.bg
-						  = ansi_col[tcp->param[1] & 0x0f];
-				tcp->cur_attr = mask2attr(tcp);
-				break;
-			case 2:	/* set ansi foreground */
-				tcp->attr_mask &= ~FG_CHANGED;
-				tcp->cur_color.fg = tcp->std_color.fg
-						  = ansi_col[tcp->param[1] & 0x0f];
-				tcp->cur_attr = mask2attr(tcp);
-				break;
-			case 3: /* set adapter attribute directly */
-				tcp->attr_mask &= ~(FG_CHANGED | BG_CHANGED);
-				tcp->cur_color.fg = tcp->std_color.fg
-						  = tcp->param[1] & 0x0f;
-				tcp->cur_color.bg = tcp->std_color.bg
-						  = (tcp->param[1] >> 4) & 0x0f;
-				tcp->cur_attr = mask2attr(tcp);
-				break;
-			case 5: /* set ansi reverse background */
-				tcp->rev_color.bg = ansi_col[tcp->param[1] & 0x0f];
-				tcp->cur_attr = mask2attr(tcp);
-				break;
-			case 6: /* set ansi reverse foreground */
-				tcp->rev_color.fg = ansi_col[tcp->param[1] & 0x0f];
-				tcp->cur_attr = mask2attr(tcp);
-				break;
-			case 7: /* set adapter reverse attribute directly */
-				tcp->rev_color.fg = tcp->param[1] & 0x0f;
-				tcp->rev_color.bg = (tcp->param[1] >> 4) & 0x0f;
-				tcp->cur_attr = mask2attr(tcp);
-				break;
-			}
-			break;
-
-		case 'z':	/* switch to (virtual) console n */
-			if (tcp->num_param == 1)
-				sc_switch_scr(sc, tcp->param[0]);
-			break;
-		}
-	} else if (tcp->esc == 3) {	/* seen ESC [0-9]+ = */
-		if (c >= '0' && c <= '9') {
-			if (tcp->num_param < MAX_ESC_PAR) {
-				if (tcp->last_param != tcp->num_param) {
-					tcp->last_param = tcp->num_param;
-					tcp->param[tcp->num_param] = 0;
-				} else {
-					tcp->param[tcp->num_param] *= 10;
-				}
-				tcp->param[tcp->num_param] += c - '0';
-				return;
-			}
-		}
-		tcp->num_param = tcp->last_param + 1;
-		switch (c) {
-
-		case ';':
-			if (tcp->num_param < MAX_ESC_PAR)
-				return;
-			break;
-
-		case 'A':   /* set display border color */
-			if (tcp->num_param == 1) {
-				scp->border=tcp->param[0] & 0xff;
-				if (scp == sc->cur_scp)
-					sc_set_border(scp, scp->border);
-			}
-			break;
-
-		case 'B':   /* set bell pitch and duration */
-			if (tcp->num_param == 2) {
-				scp->bell_pitch = tcp->param[0];
-				scp->bell_duration = 
-				    (tcp->param[1] * hz + 99) / 100;
-			}
-			break;
-
-		case 'C':   /* set global/parmanent cursor type & shape */
-			i = spltty();
-			n = tcp->num_param;
-			v0 = tcp->param[0];
-			v1 = tcp->param[1];
-			v2 = tcp->param[2];
-			switch (n) {
-			case 1:	/* flags only */
-				if (v0 < sizeof(cattrs)/sizeof(cattrs[0]))
-					v0 = cattrs[v0];
-				else	/* backward compatibility */
-					v0 = cattrs[v0 & 0x3];
-				sc_change_cursor_shape(scp, v0, -1, -1);
-				break;
-			case 2:
-				v2 = 0;
-				v0 &= 0x1f;	/* backward compatibility */
-				v1 &= 0x1f;
-				/* FALL THROUGH */
-			case 3:	/* base and height */
-				if (v2 == 0)	/* count from top */
-					sc_change_cursor_shape(scp, -1,
-					    scp->font_size - v1 - 1,
-					    v1 - v0 + 1);
-				else if (v2 == 1) /* count from bottom */
-					sc_change_cursor_shape(scp, -1,
-					    v0, v1 - v0 + 1);
-				break;
-			}
-			splx(i);
-			break;
-
-		case 'F':   /* set adapter foreground */
-			if (tcp->num_param == 1) {
-				tcp->attr_mask &= ~FG_CHANGED;
-				tcp->cur_color.fg = tcp->std_color.fg
-						  = tcp->param[0] & 0x0f;
-				tcp->cur_attr = mask2attr(tcp);
-			}
-			break;
-
-		case 'G':   /* set adapter background */
-			if (tcp->num_param == 1) {
-				tcp->attr_mask &= ~BG_CHANGED;
-				tcp->cur_color.bg = tcp->std_color.bg
-						  = tcp->param[0] & 0x0f;
-				tcp->cur_attr = mask2attr(tcp);
-			}
-			break;
-
-		case 'H':   /* set adapter reverse foreground */
-			if (tcp->num_param == 1) {
-				tcp->rev_color.fg = tcp->param[0] & 0x0f;
-				tcp->cur_attr = mask2attr(tcp);
-			}
-			break;
-
-		case 'I':   /* set adapter reverse background */
-			if (tcp->num_param == 1) {
-				tcp->rev_color.bg = tcp->param[0] & 0x0f;
-				tcp->cur_attr = mask2attr(tcp);
-			}
-			break;
-
-		case 'S':   /* set local/temporary cursor type & shape */
-			i = spltty();
-			n = tcp->num_param;
-			v0 = tcp->param[0];
-			switch (n) {
-			case 0:
-				v0 = 0;
-				/* FALL THROUGH */
-			case 1:
-				if (v0 < sizeof(tcattrs)/sizeof(tcattrs[0]))
-					sc_change_cursor_shape(scp,
-					    tcattrs[v0], -1, -1);
-				break;
-			}
-			splx(i);
-			break;
-		}
-#ifdef notyet
-	} else if (tcp->esc == 4) {	/* seen ESC Q */
-		/* to be filled */
-#endif
-	} else if (tcp->esc == 5) {	/* seen ESC ( */
-		switch (c) {
-		case 'B':   /* iso-2022: desginate ASCII into G0 */
-			break;
-		/* other items to be filled */
-		default:
-			break;
-		}
-	}
-	tcp->esc = 0;
-}
-
-static void
-scterm_puts(scr_stat *scp, u_char *buf, int len)
-{
-	term_stat *tcp;
-
-	tcp = scp->ts;
-outloop:
-	scp->sc->write_in_progress++;
-
-	if (tcp->esc) {
-		scterm_scan_esc(scp, tcp, *buf);
-		buf++;
-		len--;
-	} else {
-		switch (*buf) {
-		case 0x1b:
-			tcp->esc = 1;
-			tcp->num_param = 0;
-			buf++;
-			len--;
-			break;
-		default:
-			sc_term_gen_print(scp, &buf, &len, tcp->cur_attr);
-			break;
-		}
-	}
-
-	sc_term_gen_scroll(scp, scp->sc->scr_map[0x20], tcp->cur_attr);
-
-	scp->sc->write_in_progress--;
-	if (len)
-		goto outloop;
-}
-
-static int
-scterm_ioctl(scr_stat *scp, struct tty *tp, u_long cmd, caddr_t data,
-	     struct thread *td)
-{
-	term_stat *tcp = scp->ts;
-	vid_info_t *vi;
-
-	switch (cmd) {
-	case GIO_ATTR:      	/* get current attributes */
-		/* FIXME: */
-		*(int*)data = (tcp->cur_attr >> 8) & 0xff;
-		return 0;
-	case CONS_GETINFO:  	/* get current (virtual) console info */
-		vi = (vid_info_t *)data;
-		if (vi->size != sizeof(struct vid_info))
-			return EINVAL;
-		vi->mv_norm.fore = tcp->std_color.fg;
-		vi->mv_norm.back = tcp->std_color.bg;
-		vi->mv_rev.fore = tcp->rev_color.fg;
-		vi->mv_rev.back = tcp->rev_color.bg;
-		/*
-		 * The other fields are filled by the upper routine. XXX
-		 */
-		return ENOIOCTL;
-	}
-	return ENOIOCTL;
-}
-
-static int
-scterm_reset(scr_stat *scp, int code)
-{
-	/* FIXME */
-	return 0;
-}
-
-static void
-scterm_default_attr(scr_stat *scp, int color, int rev_color)
-{
-	term_stat *tcp = scp->ts;
-
-	tcp->dflt_std_color.fg = color & 0x0f;
-	tcp->dflt_std_color.bg = (color >> 4) & 0x0f;
-	tcp->dflt_rev_color.fg = rev_color & 0x0f;
-	tcp->dflt_rev_color.bg = (rev_color >> 4) & 0x0f;
-	tcp->std_color = tcp->dflt_std_color;
-	tcp->rev_color = tcp->dflt_rev_color;
-	tcp->cur_color = tcp->std_color;
-	tcp->cur_attr = mask2attr(tcp);
-}
-
-static void
-scterm_clear(scr_stat *scp)
-{
-	term_stat *tcp = scp->ts;
-
-	sc_move_cursor(scp, 0, 0);
-	sc_vtb_clear(&scp->vtb, scp->sc->scr_map[0x20], tcp->cur_attr);
-	mark_all(scp);
-}
-
-static void
-scterm_notify(scr_stat *scp, int event)
-{
-	switch (event) {
-	case SC_TE_NOTIFY_VTSWITCH_IN:
-		break;
-	case SC_TE_NOTIFY_VTSWITCH_OUT:
-		break;
-	}
-}
-
-static int
-scterm_input(scr_stat *scp, int c, struct tty *tp)
-{
-	return FALSE;
-}
-
-/*
- * Calculate hardware attributes word using logical attributes mask and
- * hardware colors
- */
-
-/* FIXME */
-static int
-mask2attr(term_stat *tcp)
-{
-	int attr, mask = tcp->attr_mask;
-
-	if (mask & REVERSE_ATTR) {
-		attr = ((mask & FG_CHANGED) ?
-			tcp->cur_color.bg : tcp->rev_color.fg) |
-			(((mask & BG_CHANGED) ?
-			tcp->cur_color.fg : tcp->rev_color.bg) << 4);
-	} else
-		attr = tcp->cur_color.fg | (tcp->cur_color.bg << 4);
-
-	/* XXX: underline mapping for Hercules adapter can be better */
-	if (mask & (BOLD_ATTR | UNDERLINE_ATTR))
-		attr ^= 0x08;
-	if (mask & BLINK_ATTR)
-		attr ^= 0x80;
-
-	return (attr << 8);
-}
-
-#endif /* SC_DUMB_TERMINAL */