FreeBSD/Linux Kernel Cross Reference
sys/teken/teken.c

     /*-
      * 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)
    #elif defined(__FreeBSD__) && defined(_STANDALONE)
    #include <stand.h>
    #include <sys/limits.h>
    #include <assert.h>
    #define teken_assert(x)         assert(x)
    #else /* !(__FreeBSD__ && _STANDALONE) */
    #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__ && _STANDALONE */
    
    /* 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. */
    #define TS_CONS25KEYS   0x0400  /* Fuller cons25 emul (fix function keys). */
    
    /* 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)
   {
   
           if (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)
   {
   
           if (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;
   }
   
   void
   teken_set_cons25keys(teken_t *t)
   {
   
           t->t_stateflags |= TS_CONS25KEYS;
   }
   
   /*
    * 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 >= '' && c <= '9') {
                   if (t->t_stateflags & TS_FIRSTDIGIT) {
                           /* First digit. */
                           t->t_stateflags &= ~TS_FIRSTDIGIT;
                           t->t_nums[t->t_curnum] = c - '';
                   } 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 - '';
                   }
                   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_YELLOW
   #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_YELLOW | 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 | TS_CONS25KEYS)) ==
               (TS_CONS25 | TS_CONS25KEYS))
                   return (NULL);  /* Don't override good kbd(4) strings. */
           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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