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547e74a8be
freebsd-dev/sys/teken/teken.c
Jean-Sébastien Pédron 547e74a8be teken, vt(4): New callbacks to lock the terminal once 
... to process input, instead of inside each smaller operations such as
appending a character or moving the cursor forward.

In other words, before we were doing (oversimplified):

  teken_input()
    <for each input character>
      vtterm_putchar()
        VTBUF_LOCK()
        VTBUF_UNLOCK()
      vtterm_cursor_position()
        VTBUF_LOCK()
        VTBUF_UNLOCK()

Now, we are doing:

  vtterm_pre_input()
    VTBUF_LOCK()
  teken_input()
    <for each input character>
      vtterm_putchar()
      vtterm_cursor_position()
  vtterm_post_input()
    VTBUF_UNLOCK()

The situation was even worse when the vtterm_copy() and vtterm_fill()
callbacks were involved.

The new callbacks are:
  * struct terminal_class->tc_pre_input()
  * struct terminal_class->tc_post_input()

They are called in teken_input(), surrounding the while() loop.

The goal is to improve input processing speed of vt(4). As a benchmark,
here is the time taken to write a text file of 360 000 lines (26 MiB) on
`ttyv0`:

  * vt(4), unmodified:      1500 ms
  * vt(4), with this patch: 1200 ms
  * syscons(4):              700 ms

This is on a Haswell laptop with a GENERIC-NODEBUG kernel.

At the same time, the locking is changed in the vt_flush() function
which is responsible to draw the text on screen. So instead of
(indirectly) using VTBUF_LOCK() just to read and reset the dirty area
of the internal buffer, the lock is held for about the entire function,
including the drawing part.

The change is mostly visible while content is scrolling fast: before,
lines could appear garbled while scrolling because the internal buffer
was accessed without locks (once the scrolling was finished, the output
was correct). Now, the scrolling appears correct.

In the end, the locking model is closer to what syscons(4) does.

Differential Revision:	https://reviews.freebsd.org/D15302
2018-05-16 09:01:02 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
#if defined(__FreeBSD__) && defined(_KERNEL)
#include <sys/param.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/systm.h>
#define teken_assert(x) MPASS(x)
#else /* !(__FreeBSD__ && _KERNEL) */
#include <sys/types.h>
#include <assert.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#define teken_assert(x) assert(x)
#endif /* __FreeBSD__ && _KERNEL */
/* debug messages */
#define teken_printf(x,...)
/* Private flags for t_stateflags. */
#define TS_FIRSTDIGIT 0x0001 /* First numeric digit in escape sequence. */
#define TS_INSERT 0x0002 /* Insert mode. */
#define TS_AUTOWRAP 0x0004 /* Autowrap. */
#define TS_ORIGIN 0x0008 /* Origin mode. */
#define TS_WRAPPED 0x0010 /* Next character should be printed on col 0. */
#define TS_8BIT 0x0020 /* UTF-8 disabled. */
#define TS_CONS25 0x0040 /* cons25 emulation. */
#define TS_INSTRING 0x0080 /* Inside string. */
#define TS_CURSORKEYS 0x0100 /* Cursor keys mode. */
/* Character that blanks a cell. */
#define BLANK ' '
#include "teken.h"
#include "teken_wcwidth.h"
#include "teken_scs.h"
static teken_state_t teken_state_init;
/*
* Wrappers for hooks.
*/
static inline void
teken_funcs_bell(const teken_t *t)
{
teken_assert(t->t_funcs->tf_bell != NULL);
t->t_funcs->tf_bell(t->t_softc);
}
static inline void
teken_funcs_cursor(const teken_t *t)
{
teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
teken_assert(t->t_funcs->tf_cursor != NULL);
t->t_funcs->tf_cursor(t->t_softc, &t->t_cursor);
}
static inline void
teken_funcs_putchar(const teken_t *t, const teken_pos_t *p, teken_char_t c,
const teken_attr_t *a)
{
teken_assert(p->tp_row < t->t_winsize.tp_row);
teken_assert(p->tp_col < t->t_winsize.tp_col);
teken_assert(t->t_funcs->tf_putchar != NULL);
t->t_funcs->tf_putchar(t->t_softc, p, c, a);
}
static inline void
teken_funcs_fill(const teken_t *t, const teken_rect_t *r,
const teken_char_t c, const teken_attr_t *a)
{
teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
teken_assert(t->t_funcs->tf_fill != NULL);
t->t_funcs->tf_fill(t->t_softc, r, c, a);
}
static inline void
teken_funcs_copy(const teken_t *t, const teken_rect_t *r, const teken_pos_t *p)
{
teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
teken_assert(p->tp_row + (r->tr_end.tp_row - r->tr_begin.tp_row) <= t->t_winsize.tp_row);
teken_assert(p->tp_col + (r->tr_end.tp_col - r->tr_begin.tp_col) <= t->t_winsize.tp_col);
teken_assert(t->t_funcs->tf_copy != NULL);
t->t_funcs->tf_copy(t->t_softc, r, p);
}
static inline void
teken_funcs_pre_input(const teken_t *t)
{
teken_assert(t->t_funcs->tf_pre_input != NULL);
t->t_funcs->tf_pre_input(t->t_softc);
}
static inline void
teken_funcs_post_input(const teken_t *t)
{
teken_assert(t->t_funcs->tf_post_input != NULL);
t->t_funcs->tf_post_input(t->t_softc);
}
static inline void
teken_funcs_param(const teken_t *t, int cmd, unsigned int value)
{
teken_assert(t->t_funcs->tf_param != NULL);
t->t_funcs->tf_param(t->t_softc, cmd, value);
}
static inline void
teken_funcs_respond(const teken_t *t, const void *buf, size_t len)
{
teken_assert(t->t_funcs->tf_respond != NULL);
t->t_funcs->tf_respond(t->t_softc, buf, len);
}
#include "teken_subr.h"
#include "teken_subr_compat.h"
/*
* Programming interface.
*/
void
teken_init(teken_t *t, const teken_funcs_t *tf, void *softc)
{
teken_pos_t tp = { .tp_row = 24, .tp_col = 80 };
t->t_funcs = tf;
t->t_softc = softc;
t->t_nextstate = teken_state_init;
t->t_stateflags = 0;
t->t_utf8_left = 0;
t->t_defattr.ta_format = 0;
t->t_defattr.ta_fgcolor = TC_WHITE;
t->t_defattr.ta_bgcolor = TC_BLACK;
teken_subr_do_reset(t);
teken_set_winsize(t, &tp);
}
static void
teken_input_char(teken_t *t, teken_char_t c)
{
/*
* There is no support for DCS and OSC. Just discard strings
* until we receive characters that may indicate string
* termination.
*/
if (t->t_stateflags & TS_INSTRING) {
switch (c) {
case '\x1B':
t->t_stateflags &= ~TS_INSTRING;
break;
case '\a':
t->t_stateflags &= ~TS_INSTRING;
return;
default:
return;
}
}
switch (c) {
case '\0':
break;
case '\a':
teken_subr_bell(t);
break;
case '\b':
teken_subr_backspace(t);
break;
case '\n':
case '\x0B':
teken_subr_newline(t);
break;
case '\x0C':
teken_subr_newpage(t);
break;
case '\x0E':
if (t->t_stateflags & TS_CONS25)
t->t_nextstate(t, c);
else
t->t_curscs = 1;
break;
case '\x0F':
if (t->t_stateflags & TS_CONS25)
t->t_nextstate(t, c);
else
t->t_curscs = 0;
break;
case '\r':
teken_subr_carriage_return(t);
break;
case '\t':
teken_subr_horizontal_tab(t);
break;
default:
t->t_nextstate(t, c);
break;
}
/* Post-processing assertions. */
teken_assert(t->t_cursor.tp_row >= t->t_originreg.ts_begin);
teken_assert(t->t_cursor.tp_row < t->t_originreg.ts_end);
teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
teken_assert(t->t_saved_cursor.tp_row < t->t_winsize.tp_row);
teken_assert(t->t_saved_cursor.tp_col < t->t_winsize.tp_col);
teken_assert(t->t_scrollreg.ts_end <= t->t_winsize.tp_row);
teken_assert(t->t_scrollreg.ts_begin < t->t_scrollreg.ts_end);
/* Origin region has to be window size or the same as scrollreg. */
teken_assert((t->t_originreg.ts_begin == t->t_scrollreg.ts_begin &&
t->t_originreg.ts_end == t->t_scrollreg.ts_end) ||
(t->t_originreg.ts_begin == 0 &&
t->t_originreg.ts_end == t->t_winsize.tp_row));
}
static void
teken_input_byte(teken_t *t, unsigned char c)
{
/*
* UTF-8 handling.
*/
if ((c & 0x80) == 0x00 || t->t_stateflags & TS_8BIT) {
/* One-byte sequence. */
t->t_utf8_left = 0;
teken_input_char(t, c);
} else if ((c & 0xe0) == 0xc0) {
/* Two-byte sequence. */
t->t_utf8_left = 1;
t->t_utf8_partial = c & 0x1f;
} else if ((c & 0xf0) == 0xe0) {
/* Three-byte sequence. */
t->t_utf8_left = 2;
t->t_utf8_partial = c & 0x0f;
} else if ((c & 0xf8) == 0xf0) {
/* Four-byte sequence. */
t->t_utf8_left = 3;
t->t_utf8_partial = c & 0x07;
} else if ((c & 0xc0) == 0x80) {
if (t->t_utf8_left == 0)
return;
t->t_utf8_left--;
t->t_utf8_partial = (t->t_utf8_partial << 6) | (c & 0x3f);
if (t->t_utf8_left == 0) {
teken_printf("Got UTF-8 char %x\n", t->t_utf8_partial);
teken_input_char(t, t->t_utf8_partial);
}
}
}
void
teken_input(teken_t *t, const void *buf, size_t len)
{
const char *c = buf;
teken_funcs_pre_input(t);
while (len-- > 0)
teken_input_byte(t, *c++);
teken_funcs_post_input(t);
}
const teken_pos_t *
teken_get_cursor(const teken_t *t)
{
return (&t->t_cursor);
}
void
teken_set_cursor(teken_t *t, const teken_pos_t *p)
{
/* XXX: bounds checking with originreg! */
teken_assert(p->tp_row < t->t_winsize.tp_row);
teken_assert(p->tp_col < t->t_winsize.tp_col);
t->t_cursor = *p;
}
const teken_attr_t *
teken_get_curattr(const teken_t *t)
{
return (&t->t_curattr);
}
void
teken_set_curattr(teken_t *t, const teken_attr_t *a)
{
t->t_curattr = *a;
}
const teken_attr_t *
teken_get_defattr(const teken_t *t)
{
return (&t->t_defattr);
}
void
teken_set_defattr(teken_t *t, const teken_attr_t *a)
{
t->t_curattr = t->t_saved_curattr = t->t_defattr = *a;
}
const teken_pos_t *
teken_get_winsize(const teken_t *t)
{
return (&t->t_winsize);
}
static void
teken_trim_cursor_pos(teken_t *t, const teken_pos_t *new)
{
const teken_pos_t *cur;
cur = &t->t_winsize;
if (cur->tp_row < new->tp_row || cur->tp_col < new->tp_col)
return;
if (t->t_cursor.tp_row >= new->tp_row)
t->t_cursor.tp_row = new->tp_row - 1;
if (t->t_cursor.tp_col >= new->tp_col)
t->t_cursor.tp_col = new->tp_col - 1;
}
void
teken_set_winsize(teken_t *t, const teken_pos_t *p)
{
teken_trim_cursor_pos(t, p);
t->t_winsize = *p;
teken_subr_do_reset(t);
}
void
teken_set_winsize_noreset(teken_t *t, const teken_pos_t *p)
{
teken_trim_cursor_pos(t, p);
t->t_winsize = *p;
teken_subr_do_resize(t);
}
void
teken_set_8bit(teken_t *t)
{
t->t_stateflags |= TS_8BIT;
}
void
teken_set_cons25(teken_t *t)
{
t->t_stateflags |= TS_CONS25;
}
/*
* State machine.
*/
static void
teken_state_switch(teken_t *t, teken_state_t *s)
{
t->t_nextstate = s;
t->t_curnum = 0;
t->t_stateflags |= TS_FIRSTDIGIT;
}
static int
teken_state_numbers(teken_t *t, teken_char_t c)
{
teken_assert(t->t_curnum < T_NUMSIZE);
if (c >= '0' && c <= '9') {
if (t->t_stateflags & TS_FIRSTDIGIT) {
/* First digit. */
t->t_stateflags &= ~TS_FIRSTDIGIT;
t->t_nums[t->t_curnum] = c - '0';
} else if (t->t_nums[t->t_curnum] < UINT_MAX / 100) {
/*
* There is no need to continue parsing input
* once the value exceeds the size of the
* terminal. It would only allow for integer
* overflows when performing arithmetic on the
* cursor position.
*
* Ignore any further digits if the value is
* already UINT_MAX / 100.
*/
t->t_nums[t->t_curnum] =
t->t_nums[t->t_curnum] * 10 + c - '0';
}
return (1);
} else if (c == ';') {
if (t->t_stateflags & TS_FIRSTDIGIT)
t->t_nums[t->t_curnum] = 0;
/* Only allow a limited set of arguments. */
if (++t->t_curnum == T_NUMSIZE) {
teken_state_switch(t, teken_state_init);
return (1);
}
t->t_stateflags |= TS_FIRSTDIGIT;
return (1);
} else {
if (t->t_stateflags & TS_FIRSTDIGIT && t->t_curnum > 0) {
/* Finish off the last empty argument. */
t->t_nums[t->t_curnum] = 0;
t->t_curnum++;
} else if ((t->t_stateflags & TS_FIRSTDIGIT) == 0) {
/* Also count the last argument. */
t->t_curnum++;
}
}
return (0);
}
#define k TC_BLACK
#define b TC_BLUE
#define y TC_BROWN
#define c TC_CYAN
#define g TC_GREEN
#define m TC_MAGENTA
#define r TC_RED
#define w TC_WHITE
#define K (TC_BLACK | TC_LIGHT)
#define B (TC_BLUE | TC_LIGHT)
#define Y (TC_BROWN | TC_LIGHT)
#define C (TC_CYAN | TC_LIGHT)
#define G (TC_GREEN | TC_LIGHT)
#define M (TC_MAGENTA | TC_LIGHT)
#define R (TC_RED | TC_LIGHT)
#define W (TC_WHITE | TC_LIGHT)
/**
* The xterm-256 color map has steps of 0x28 (in the range 0-0xff), except
* for the first step which is 0x5f. Scale to the range 0-6 by dividing
* by 0x28 and rounding down. The range of 0-5 cannot represent the
* larger first step.
*
* This table is generated by the follow rules:
* - if all components are equal, the result is black for (0, 0, 0) and
* (2, 2, 2), else white; otherwise:
* - subtract the smallest component from all components
* - if this gives only one nonzero component, then that is the color
* - else if one component is 2 or more larger than the other nonzero one,
* then that component gives the color
* - else there are 2 nonzero components. The color is that of a small
* equal mixture of these components (cyan, yellow or magenta). E.g.,
* (0, 5, 6) (Turquoise2) is a much purer cyan than (0, 2, 3)
* (DeepSkyBlue4), but we map both to cyan since we can't represent
* delicate shades of either blue or cyan and blue would be worse.
* Here it is important that components of 1 never occur. Blue would
* be twice as large as green in (0, 1, 2).
*/
static const teken_color_t teken_256to8tab[] = {
/* xterm normal colors: */
k, r, g, y, b, m, c, w,
/* xterm bright colors: */
k, r, g, y, b, m, c, w,
/* Red0 submap. */
k, b, b, b, b, b,
g, c, c, b, b, b,
g, c, c, c, b, b,
g, g, c, c, c, b,
g, g, g, c, c, c,
g, g, g, g, c, c,
/* Red2 submap. */
r, m, m, b, b, b,
y, k, b, b, b, b,
y, g, c, c, b, b,
g, g, c, c, c, b,
g, g, g, c, c, c,
g, g, g, g, c, c,
/* Red3 submap. */
r, m, m, m, b, b,
y, r, m, m, b, b,
y, y, w, b, b, b,
y, y, g, c, c, b,
g, g, g, c, c, c,
g, g, g, g, c, c,
/* Red4 submap. */
r, r, m, m, m, b,
r, r, m, m, m, b,
y, y, r, m, m, b,
y, y, y, w, b, b,
y, y, y, g, c, c,
g, g, g, g, c, c,
/* Red5 submap. */
r, r, r, m, m, m,
r, r, r, m, m, m,
r, r, r, m, m, m,
y, y, y, r, m, m,
y, y, y, y, w, b,
y, y, y, y, g, c,
/* Red6 submap. */
r, r, r, r, m, m,
r, r, r, r, m, m,
r, r, r, r, m, m,
r, r, r, r, m, m,
y, y, y, y, r, m,
y, y, y, y, y, w,
/* Grey submap. */
k, k, k, k, k, k,
k, k, k, k, k, k,
w, w, w, w, w, w,
w, w, w, w, w, w,
};
/*
* This table is generated from the previous one by setting TC_LIGHT for
* entries whose luminosity in the xterm256 color map is 60% or larger.
* Thus the previous table is currently not really needed. It will be
* used for different fine tuning of the tables.
*/
static const teken_color_t teken_256to16tab[] = {
/* xterm normal colors: */
k, r, g, y, b, m, c, w,
/* xterm bright colors: */
K, R, G, Y, B, M, C, W,
/* Red0 submap. */
k, b, b, b, b, b,
g, c, c, b, b, b,
g, c, c, c, b, b,
g, g, c, c, c, b,
g, g, g, c, c, c,
g, g, g, g, c, c,
/* Red2 submap. */
r, m, m, b, b, b,
y, K, b, b, B, B,
y, g, c, c, B, B,
g, g, c, c, C, B,
g, G, G, C, C, C,
g, G, G, G, C, C,
/* Red3 submap. */
r, m, m, m, b, b,
y, r, m, m, B, B,
y, y, w, B, B, B,
y, y, G, C, C, B,
g, G, G, C, C, C,
g, G, G, G, C, C,
/* Red4 submap. */
r, r, m, m, m, b,
r, r, m, m, M, B,
y, y, R, M, M, B,
y, y, Y, W, B, B,
y, Y, Y, G, C, C,
g, G, G, G, C, C,
/* Red5 submap. */
r, r, r, m, m, m,
r, R, R, M, M, M,
r, R, R, M, M, M,
y, Y, Y, R, M, M,
y, Y, Y, Y, W, B,
y, Y, Y, Y, G, C,
/* Red6 submap. */
r, r, r, r, m, m,
r, R, R, R, M, M,
r, R, R, R, M, M,
r, R, R, R, M, M,
y, Y, Y, Y, R, M,
y, Y, Y, Y, Y, W,
/* Grey submap. */
k, k, k, k, k, k,
K, K, K, K, K, K,
w, w, w, w, w, w,
W, W, W, W, W, W,
};
#undef k
#undef b
#undef y
#undef c
#undef g
#undef m
#undef r
#undef w
#undef K
#undef B
#undef Y
#undef C
#undef G
#undef M
#undef R
#undef W
teken_color_t
teken_256to8(teken_color_t c)
{
return (teken_256to8tab[c % 256]);
}
teken_color_t
teken_256to16(teken_color_t c)
{
return (teken_256to16tab[c % 256]);
}
static const char * const special_strings_cons25[] = {
[TKEY_UP] = "\x1B[A", [TKEY_DOWN] = "\x1B[B",
[TKEY_LEFT] = "\x1B[D", [TKEY_RIGHT] = "\x1B[C",
[TKEY_HOME] = "\x1B[H", [TKEY_END] = "\x1B[F",
[TKEY_INSERT] = "\x1B[L", [TKEY_DELETE] = "\x7F",
[TKEY_PAGE_UP] = "\x1B[I", [TKEY_PAGE_DOWN] = "\x1B[G",
[TKEY_F1] = "\x1B[M", [TKEY_F2] = "\x1B[N",
[TKEY_F3] = "\x1B[O", [TKEY_F4] = "\x1B[P",
[TKEY_F5] = "\x1B[Q", [TKEY_F6] = "\x1B[R",
[TKEY_F7] = "\x1B[S", [TKEY_F8] = "\x1B[T",
[TKEY_F9] = "\x1B[U", [TKEY_F10] = "\x1B[V",
[TKEY_F11] = "\x1B[W", [TKEY_F12] = "\x1B[X",
};
static const char * const special_strings_ckeys[] = {
[TKEY_UP] = "\x1BOA", [TKEY_DOWN] = "\x1BOB",
[TKEY_LEFT] = "\x1BOD", [TKEY_RIGHT] = "\x1BOC",
[TKEY_HOME] = "\x1BOH", [TKEY_END] = "\x1BOF",
};
static const char * const special_strings_normal[] = {
[TKEY_UP] = "\x1B[A", [TKEY_DOWN] = "\x1B[B",
[TKEY_LEFT] = "\x1B[D", [TKEY_RIGHT] = "\x1B[C",
[TKEY_HOME] = "\x1B[H", [TKEY_END] = "\x1B[F",
[TKEY_INSERT] = "\x1B[2~", [TKEY_DELETE] = "\x1B[3~",
[TKEY_PAGE_UP] = "\x1B[5~", [TKEY_PAGE_DOWN] = "\x1B[6~",
[TKEY_F1] = "\x1BOP", [TKEY_F2] = "\x1BOQ",
[TKEY_F3] = "\x1BOR", [TKEY_F4] = "\x1BOS",
[TKEY_F5] = "\x1B[15~", [TKEY_F6] = "\x1B[17~",
[TKEY_F7] = "\x1B[18~", [TKEY_F8] = "\x1B[19~",
[TKEY_F9] = "\x1B[20~", [TKEY_F10] = "\x1B[21~",
[TKEY_F11] = "\x1B[23~", [TKEY_F12] = "\x1B[24~",
};
const char *
teken_get_sequence(const teken_t *t, unsigned int k)
{
/* Cons25 mode. */
if (t->t_stateflags & TS_CONS25 &&
k < sizeof special_strings_cons25 / sizeof(char *))
return (special_strings_cons25[k]);
/* Cursor keys mode. */
if (t->t_stateflags & TS_CURSORKEYS &&
k < sizeof special_strings_ckeys / sizeof(char *))
return (special_strings_ckeys[k]);
/* Default xterm sequences. */
if (k < sizeof special_strings_normal / sizeof(char *))
return (special_strings_normal[k]);
return (NULL);
}
#include "teken_state.h"
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