/*
 * vt102.c:
 *
 * Copyright (c) 2008 James McKenzie <james@fishsoup.dhs.org>,
 * All rights reserved.
 *
 */

static char rcsid[] = "$Id$";

/*
 * $Log$
 * Revision 1.15  2008/02/07 00:43:27  james
 * *** empty log message ***
 *
 * Revision 1.14  2008/02/07 00:40:23  james
 * *** empty log message ***
 *
 * Revision 1.13  2008/02/07 00:39:59  james
 * *** empty log message ***
 *
 * Revision 1.12  2008/02/07 00:39:13  james
 * *** empty log message ***
 *
 * Revision 1.11  2008/02/06 20:26:58  james
 * *** empty log message ***
 *
 * Revision 1.10  2008/02/06 17:53:28  james
 * *** empty log message ***
 *
 * Revision 1.9  2008/02/06 15:53:22  james
 * *** empty log message ***
 *
 * Revision 1.8  2008/02/06 11:49:47  james
 * *** empty log message ***
 *
 * Revision 1.7  2008/02/06 11:30:37  james
 * *** empty log message ***
 *
 * Revision 1.6  2008/02/05 01:11:46  james
 * *** empty log message ***
 *
 * Revision 1.5  2008/02/04 20:23:55  james
 * *** empty log message ***
 *
 * Revision 1.4  2008/02/04 05:45:55  james
 * ::
 *
 * Revision 1.3  2008/02/04 02:05:06  james
 * *** empty log message ***
 *
 * Revision 1.2  2008/02/04 01:32:39  james
 * *** empty log message ***
 *
 * Revision 1.1  2008/02/03 23:36:41  james
 * *** empty log message ***
 *
 */


/* Termcap he say:

vt102|dec vt102:\
        :mi:\
        :al=\E[L:dc=\E[P:dl=\E[M:ei=\E[4l:im=\E[4h:tc=vt100:

vt100|vt100-am|dec vt100 (w/advanced video):\
        :am:bs:ms:xn:xo:\
        :co#80:it#8:li#24:vt#3:\
        :DO=\E[%dB:LE=\E[%dD:RA=\E[?7l:RI=\E[%dC:SA=\E[?7h:\
        :UP=\E[%dA:\
        :ac=``aaffggjjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~:\
        :ae=^O:as=^N:bl=^G:cb=\E[1K:cd=\E[J:ce=\E[K:cl=\E[H\E[J:\
        :cm=\E[%i%d;%dH:cr=^M:cs=\E[%i%d;%dr:ct=\E[3g:do=^J:\
        :eA=\E(B\E)0:ho=\E[H:kb=^H:kd=\EOB:ke=\E[?1l\E>:kl=\EOD:\
        :kr=\EOC:ks=\E[?1h\E=:ku=\EOA:le=^H:mb=\E[5m:md=\E[1m:\
        :me=\E[m\017:mr=\E[7m:nd=\E[C:rc=\E8:\
        :rs=\E>\E[?3l\E[?4l\E[?5l\E[?7h\E[?8h:sc=\E7:se=\E[m:\
        :sf=^J:so=\E[7m:sr=\EM:st=\EH:ta=^I:ue=\E[m:up=\E[A:\
        :us=\E[4m:tc=vt100+fnkeys:

vt100+fnkeys|dec vt100 numeric keypad:\
        :k0=\EOy:k5=\EOt:k6=\EOu:k7=\EOv:k8=\EOl:k9=\EOw:k;=\EOx:\
        :tc=vt100+pfkeys:

vt100+pfkeys|dec vt100 numeric keypad:\
        :@8=\EOM:k1=\EOP:k2=\EOQ:k3=\EOR:k4=\EOS:tc=vt100+keypad:

vt100+keypad|dec vt100 numeric keypad no fkeys:\
        :K1=\EOq:K2=\EOr:K3=\EOs:K4=\EOp:K5=\EOn:

*/

/*
so the parser needs to be able to at least do
CTRL-G
CTRL-H
CTRL-I
CTRL-J
CTRL-M
CTRL-N

CTRL-O
ESC7
ESC8
ESCH
ESCM
ESC> 

ESC[%dA
ESC[%dB
ESC[%dC
ESC[%dD
ESC[H
ESC[%d;%dH
ESC[J
ESC[K
ESC[1K
ESC[L
ESC[M
ESC[P

ESC[3g
ESC[4h
ESC[4l
ESC[m 
ESC[1m
ESC[4m
ESC[5m
ESC[7m
ESC[%d;%dr


ESC[?3l 
ESC[?4l 
ESC[?5l
ESC[?7h
ESC[?7h
ESC[?7l
ESC[?8h

ESC(B
ESC)0


TODO:

ESC(B
ESC)0

CTRL-O

ESC7
ESC8
ESCH
ESCM
ESC> 

*/

#include "project.h"



static inline int
csi_ender (int c)
{
  if ((c >= 'a') && (c <= 'z'))
    return 1;
  if ((c >= 'A') && (c <= 'Z'))
    return 1;
  return 0;
}

static inline int
csi_starter (int c)
{
  switch (c)
    {
    case '[':
    case '(':
    case ')':
      return 1;
    }
  return 0;
}

static inline int
in_margins (VT102 * v, CRT_Pos p)
{
  if (v->pos.x < v->top_margin.x)
    return 0;
  if (v->pos.y < v->top_margin.y)
    return 0;

  if (v->pos.x > v->bottom_margin.x)
    return 0;
  if (v->pos.y > v->bottom_margin.y)
    return 0;

  return 1;
}

void
vt102_log_line (VT102 * v, int line)
{
  static FILE *log;
  CRT_Pos e = { VT102_COLS - 1, line };
  CRT_Pos p = { 0, line };

  if (!log)
    log = fopen ("log", "a+");

  if (!log)
    return;


  for (; e.x > 0; --e.x)
    {
      if (v->crt.screen[CRT_ADDR_POS (&e)].chr != ' ')
        break;
    }

  for (; p.x <= e.x; ++p.x)
    {
      int c = v->crt.screen[CRT_ADDR_POS (&p)].chr;
      if (c < 32)
        c = ' ';
      if (c > 126)
        c = ' ';
      fputc (c, log);
    }
  fputc ('\n', log);
}

void
vt102_clip_cursor (VT102 * v, CRT_Pos tl, CRT_Pos br)
{
  if (v->pos.x < tl.x)
    v->pos.x = tl.x;
  if (v->pos.y < tl.y)
    v->pos.y = tl.y;

  if (v->pos.x > br.x)
    v->pos.x = br.x;
  if (v->pos.y > br.y)
    v->pos.y = br.y;
}


void
vt102_cursor_normalize (VT102 * v)
{
  CRT_Pos *top, *bottom;

  if (v->private_modes[VT102_PRIVATE_MODE_ORIGIN_MODE])
    {
      vt102_clip_cursor (v, v->top_margin, v->bottom_margin);
    }
  else
    {
      vt102_clip_cursor (v, v->screen_start, v->screen_end);
    }
}


void
vt102_cursor_carriage_return (VT102 * v)
{
   /*FISH*/ v->pos.x = v->top_margin.x;
  v->pending_wrap = 0;
}

void
vt102_cursor_advance_line (VT102 * v)
{
  int couldscroll = in_margins (v, v->pos);

/*have wraped off end of last line in scrolling region */
/* (|| not necessary, but shuts compiler up */
  if (((v->pos.y == v->bottom_margin.y) || (v->pos.y == v->screen_end.y)) &&
      (couldscroll))
    {
      vt102_log_line (v, v->pos.y);
      crt_scroll_up (&v->crt, v->top_margin, v->bottom_margin, 1);
      return;
    }

  v->pos.y++;
  v->pending_wrap = 0;
}


void
vt102_cursor_advance (VT102 * v)
{

  if (v->pos.x < v->bottom_margin.x)
    {
/*Normal advance*/
      v->pos.x++;
      v->pending_wrap = 0;
      return;
    }
  v->pending_wrap++;
}


void
vt102_do_pending_wrap (VT102 * v)
{
  int couldscroll = in_margins (v, v->pos);
  int autowrap = v->private_modes[VT102_PRIVATE_MODE_AUTO_WRAP];

  if (!v->pending_wrap)
    return;

#if 0
  fprintf (stderr, "ca: (%d,%d) autowrap %d couldscroll %d\n", v->pos.x,
           v->pos.y, autowrap, couldscroll);
#endif

/*End of line but no autowrap, nothing to do*/
  if (!autowrap)
    return;

/*End of screen and not allowed to scroll, nothing to do*/
  if ((v->pos.y == v->screen_end.y) && (!couldscroll))
    return;

  if (couldscroll)
    {
      v->pos.x = v->top_margin.x;
    }
  else
    {
      v->pos.x = 0;
    }

  vt102_cursor_advance_line (v);
}


void
vt102_cursor_retard (VT102 * v)
{
  if (v->pos.x != v->top_margin.x)
    v->pos.x--;

  v->pending_wrap = 0;
}

void
vt102_reset_tabs (VT102 * v)
{
  int i;

  memset (v->tabs, 0, sizeof (v->tabs));

  for (i = 0; i < VT102_COLS; i += 8)
    {
      v->tabs[i]++;
    }
}
void
vt102_cursor_advance_tab (VT102 * v)
{
  if (v->pos.x == v->bottom_margin.x)
    return;
  while (v->pos.x < v->bottom_margin.x)
    {
      v->pos.x++;
      if (v->tabs[v->pos.x])
        break;
    }
  v->pending_wrap = 0;
}

vt102_cursor_home (VT102 * v)
{
  v->pos = v->top_margin;
  vt102_cursor_normalize (v);
  v->pending_wrap = 0;

}

vt102_cursor_absolute (VT102 * v, int x, int y)
{
  if (v->private_modes[VT102_PRIVATE_MODE_ORIGIN_MODE])
    {
      v->pos.x = x + v->top_margin.x;
      v->pos.y = y + v->top_margin.x;
    }
  else
    {
      v->pos.x = x;
      v->pos.y = y;
    }
  vt102_cursor_normalize (v);
  v->pending_wrap = 0;
}

vt102_cursor_relative (VT102 * v, int x, int y)
{
  v->pos.x += x;
  v->pos.y += y;
  vt102_cursor_normalize (v);
  v->pending_wrap = 0;
}



void
vt102_delete_from_line (VT102 * v, CRT_Pos p)
{
  int n = v->bottom_margin.x - p.x;

  if (n < 0)
    return;

  if (n)
    {

      memmove (&v->crt.screen[CRT_ADDR_POS (&p)],
               &v->crt.screen[CRT_ADDR_POS (&p) + 1], sizeof (CRT_CA) * n);
    }

  v->crt.screen[CRT_ADDR (p.y, v->bottom_margin.x)].chr = ' ';
/*But not attr due to vt102 bug*/
}

void
vt102_insert_into_line (VT102 * v, CRT_Pos p)
{
  int n = v->bottom_margin.x - p.x;

  if (n < 0)
    return;

  if (n)
    {

      memmove (&v->crt.screen[CRT_ADDR_POS (&p) + 1],
               &v->crt.screen[CRT_ADDR_POS (&p)], sizeof (CRT_CA) * n);
    }

  v->crt.screen[CRT_ADDR (p.y, v->bottom_margin.x)].chr = ' ';
  v->crt.screen[CRT_ADDR (p.y, v->bottom_margin.x)].attr = CRT_ATTR_NORMAL;
}



void
vt102_change_mode (VT102 * v, int private, char *ns, int set)
{
  int m;


  if (*ns)
    {
      m = atoi (ns);
    }
  else
    {
      m = 1;
    }

  if (m < 0)
    return;
  if (m >= VT102_NMODES)
    return;

  if (private)
    {
      v->private_modes[m] = set;
      switch (m)
        {
        case VT102_PRIVATE_MODE_CURSOR_MODE:
          if (v->application_keypad_mode)
            v->private_modes[m] = 0;
#if 0
          fprintf (stderr, "APPLICATION CURSOR MODE %d\n",
                   v->private_modes[m]);
#endif
          break;
        case VT102_PRIVATE_MODE_ORIGIN_MODE:
          vt102_cursor_home (v);
          break;
        }

    }
  else
    v->modes[m] = set;

#if 0
  fprintf (stderr, "mode set=%d private=%d num=%d\n", set, private, m);
#endif
}

void
vt102_parse_mode_string (VT102 * v, char *buf, int len)
{
  int private = 0;
  char last = buf[len - 1];
  char num[4];
  int o;

  memset (num, 0, sizeof (num));
  o = sizeof (num) - 1;

  len--;

  if (*buf == '?')
    {
      private++;
      buf++;
      len--;
    }

  if (len < 0)
    return;

  while (len--)
    {
      if (*buf == ';')
        {
          vt102_change_mode (v, private, &num[o], last == 'h');
          memset (num, 0, sizeof (num));
          o = sizeof (num) - 1;
          buf++;
          continue;
        }

      num[0] = num[1];
      num[1] = num[2];
      num[2] = *buf;

      if (o)
        o--;

      buf++;
    }

  vt102_change_mode (v, private, &num[o], last == 'h');

}


void
vt102_change_attr (VT102 * v, char *na)
{
  int a;


  if (*na)
    {
      a = atoi (na);
    }
  else
    {
      a = 0;
    }

  switch (a)
    {
    case 0:
      v->attr = CRT_ATTR_NORMAL;
      break;
    case 1:
      v->attr |= CRT_ATTR_BOLD;
      break;
    case 21:
    case 22:
      v->attr &= ~CRT_ATTR_BOLD;
      break;
    case 4:
      v->attr |= CRT_ATTR_UNDERLINE;
      break;
    case 24:
      v->attr &= ~CRT_ATTR_UNDERLINE;
      break;
    case 5:
      v->attr |= CRT_ATTR_BLINK;
      break;
    case 25:
      v->attr &= ~CRT_ATTR_BLINK;
      break;
    case 7:
      v->attr |= CRT_ATTR_REVERSE;
      break;
    case 27:
      v->attr &= ~CRT_ATTR_REVERSE;
      break;
    default:
      ;
#if 0
      fprintf (stderr, "unhandled SGR %d\n", a);
#endif
    }

}


void
vt102_parse_attr_string (VT102 * v, char *buf, int len)
{
  int private = 0;
  char last = buf[len - 1];
  char num[4];
  int o;

  memset (num, 0, sizeof (num));
  o = sizeof (num) - 1;

  len--;

  if (len < 0)
    return;

  while (len--)
    {
      if (*buf == ';')
        {
          vt102_change_attr (v, &num[o]);
          memset (num, 0, sizeof (num));
          o = sizeof (num) - 1;
          buf++;
          continue;
        }

      num[0] = num[1];
      num[1] = num[2];
      num[2] = *buf;

      if (o)
        o--;

      buf++;
    }
  vt102_change_attr (v, &num[o]);
}

void
vt102_save_state (VT102 * v)
{
  v->saved.pos = v->pos;
  v->saved.attr = v->attr;
  v->saved.origin_mode = v->private_modes[VT102_PRIVATE_MODE_ORIGIN_MODE];
}

void
vt102_restore_state (VT102 * v)
{
  v->pos = v->saved.pos;
  v->attr = v->saved.attr;
  v->private_modes[VT102_PRIVATE_MODE_ORIGIN_MODE] = v->saved.origin_mode;
  vt102_cursor_normalize (v);
  v->pending_wrap = 0;
}

void
vt102_parse_esc (VT102 * v, int c)
{
  switch (c)
    {
    case 'E':
      if (v->pos.y == v->bottom_margin.y)
        {
          vt102_log_line (v, v->pos.y);
          crt_scroll_up (&v->crt, v->top_margin, v->bottom_margin, 1);
        }
      else
        {
          vt102_cursor_relative (v, 0, 1);
        }
      break;
    case 'H':
      v->tabs[v->pos.x]++;
      break;
    case 'M':
      if (v->pos.y == v->top_margin.y)
        {
          crt_scroll_down (&v->crt, v->top_margin, v->bottom_margin, 1);
        }
      else
        {
          vt102_cursor_relative (v, 0, -1);
        }
      break;
    case '7':
      vt102_save_state (v);
      break;
    case '8':
      vt102_restore_state (v);
      break;
    case '=':
      v->application_keypad_mode = 1;
      break;
    case '>':
      v->application_keypad_mode = 0;
      break;
    default:
#if 0
      fprintf (stderr, "unhandled ESC \\033 \\%03o (ESC %c)\n", c,
               (c < 32) ? '?' : c);
#endif
      ;
    }
}
void
vt102_parse_csi (VT102 * v, char *buf, int len)
{
  char last;
  char *ptr;
  char *arg = buf + 1;
  int narg;

  buf[len] = 0;

  last = buf[len - 1];
#if 0
  buf[len - 1] = 0;
#endif

  if (len > 2)
    {
      narg = atoi (arg);
    }
  else
    {
      narg = 1;
    }

  switch (buf[0])
    {
    case '[':
      switch (last)
        {
        case 'A':
          vt102_cursor_relative (v, 0, -narg);
          break;
        case 'B':
          vt102_cursor_relative (v, 0, narg);
          break;
        case 'C':
          vt102_cursor_relative (v, narg, 0);
          break;
        case 'D':
          vt102_cursor_relative (v, -narg, 0);
          break;
        case 'E':
          vt102_cursor_relative (v, 0, narg);
          vt102_cursor_carriage_return (v);
          break;
        case 'F':
          vt102_cursor_relative (v, 0, -narg);
          vt102_cursor_carriage_return (v);
          break;
        case 'G':
          vt102_cursor_absolute (v, narg - 1, v->pos.y);
          break;
        case 'H':
        case 'f':
          {
            int x, y;

            y = narg - 1;

            ptr = index (arg, ';');
            if (ptr)
              x = atoi (ptr + 1) - 1;
            else
              x = 0;

            vt102_cursor_absolute (v, x, y);
          }
          break;
        case 'J':
          switch (narg)
            {
            case 1:
              crt_erase (&v->crt, v->pos, v->screen_end, 1);
              break;
            case 2:
              crt_erase (&v->crt, v->screen_start, v->screen_end, 1);
              break;
            }
          break;
        case 'K':
          {
            CRT_Pos ls = { 0, v->pos.y };
            CRT_Pos le = { VT102_COLS - 1, v->pos.y };
            if (len == 2)
              narg = 0;         /*Different default */

            switch (narg)
              {
              case 0:
                crt_erase (&v->crt, v->pos, le, 1);
                break;
              case 1:
                crt_erase (&v->crt, ls, v->pos, 1);
                break;
              case 2:
                crt_erase (&v->crt, ls, le, 1);
                break;
              }
          }
          break;

        case 'P':
          while (narg--)
            vt102_delete_from_line (v, v->pos);
          break;
        case 'L':
          if ((v->pos.y >= v->top_margin.y)
              && (v->pos.y <= v->bottom_margin.y))
            {
              while (narg--)
                crt_scroll_down (&v->crt, v->pos, v->bottom_margin, 1);
            }
          break;

        case 'M':
          if ((v->pos.y >= v->top_margin.y)
              && (v->pos.y <= v->bottom_margin.y))
            {
              while (narg--)
                crt_scroll_up (&v->crt, v->pos, v->bottom_margin, 0);
            }
          break;

        case 'g':
          if (len == 2)
            narg = 0;           /*Different default */

          switch (narg)
            {
            case 0:
              v->tabs[v->pos.x] = 0;
              break;
            case 3:
              memset (v->tabs, 0, sizeof (v->tabs));
              break;
            }
          break;

        case 'h':
        case 'l':
          vt102_parse_mode_string (v, &buf[1], len - 1);
          break;

        case 'm':
          vt102_parse_attr_string (v, &buf[1], len - 1);
          break;
        case 'r':
          v->top_margin = v->screen_start;
          v->bottom_margin = v->screen_end;

          if ((len > 2) && (ptr = index (arg, ';')))
            {
              ptr++;
              v->top_margin.y = narg - 1;
              v->bottom_margin.y = atoi (ptr) - 1;
            }

          if (v->top_margin.y < v->screen_start.y)
            v->top_margin.y = v->screen_start.y;
          if (v->top_margin.y > v->screen_end.y)
            v->top_margin.y = v->screen_end.y;
          if (v->bottom_margin.y < v->screen_start.y)
            v->bottom_margin.y = v->screen_start.y;
          if (v->bottom_margin.y > v->screen_end.y)
            v->bottom_margin.y = v->screen_end.y;

          vt102_cursor_home (v);
          break;
        case 's':
          v->saved.pos = v->pos;
          break;
        case 'u':
          v->pos = v->saved.pos;
          vt102_cursor_normalize (v);
          v->pending_wrap = 0;
          break;

        default:
#if 0
          fprintf (stderr, "unhandled CSI  \\033%s\n", buf, buf[0]);
#endif
          ;
        }
      break;
    default:
#if 0
      fprintf (stderr, "unhandled CSI  \\033%s\n", buf, buf[0]);
#endif
      ;
    }



}

void
vt102_status_line (VT102 * v, char *str)
{
  int i = VT102_COLS;
  CRT_CA *ca = &v->crt.screen[CRT_ADDR (VT102_STATUS_ROW, 0)];

  while (i--)
    {
      ca->attr = CRT_ATTR_REVERSE;
      ca->chr = *str;
      if (*str)
        str++;
      ca++;
    }

}


void
vt102_parse_char (VT102 * v, int c)
{
  VT102_parser *p = &v->parser;


#if 0
  fprintf (stderr, "char %c pc %d %d %d   %d %d\n", (c < 32) ? 32 : c, c,
           p->in_csi, p->in_escape, v->pos.x, v->pos.y);
#endif
  if (p->in_csi)
    {
      p->csi_buf[p->csi_ptr++] = c;
      if (csi_ender (c) || (p->csi_ptr == VT102_CSI_LEN))
        {
          vt102_parse_csi (v, p->csi_buf, p->csi_ptr);
          p->in_csi = 0;
        }
    }
  else if (p->in_escape)
    {
      if (csi_starter (c))
        {
          p->csi_ptr = 0;
          p->csi_buf[p->csi_ptr++] = c;
          p->in_csi++;
          p->in_escape = 0;
        }
      else
        {
          p->in_escape = 0;
          vt102_parse_esc (v, c);
        }
    }
  else
    {

      switch (c)
        {
         /*NUL*/ case 0:
         /*SOH*/ case 1:
         /*STX*/ case 2:
         /*ETX*/ case 3:
         /*EOT*/ case 4:
          break;
         /*ENQ*/ case 5:
          tty_write (v->tty, "vt102", 5);
          break;
         /*ACK*/ case 6:
         /*BEL*/ case 7:
          break;
         /*BS*/ case 8:
          vt102_cursor_retard (v);
          break;
         /*HT*/ case 9:
          vt102_cursor_advance_tab (v);
          break;
         /*LF*/ case 10:
         /*VT*/ case 11:
         /*FF*/ case 12:
          vt102_cursor_advance_line (v);
          if (!v->modes[VT102_MODE_NEWLINE_MODE])
            break;
         /*CR*/ case 13:
          vt102_cursor_carriage_return (v);
          break;
         /*SO*/ case 14:
         /*SI*/ case 15:
         /*DLE*/ case 16:
        /*DC1 */ case 17:
        /*DC2 */ case 18:
        /*DC3 */ case 19:
        /*DC4 */ case 20:
         /*NAK*/ case 21:
         /*SYN*/ case 22:
         /*ETB*/ case 23:
         /*CAN*/ case 24:
         /*EM*/ case 25:
         /*SUB*/ case 26:
          break;
         /*ESC*/ case 27:
          p->in_escape++;
          return;
         /*FS*/ case 28:
         /*GS*/ case 29:
         /*RS*/ case 30:
         /*US*/ case 31:
         /*DEL*/ case 127:
          break;
        /*regular character */ default:
          vt102_do_pending_wrap (v);

          if (v->modes[VT102_MODE_INSERT])
            vt102_insert_into_line (v, v->pos);

          v->crt.screen[CRT_ADDR_POS (&v->pos)].chr = c;
          v->crt.screen[CRT_ADDR_POS (&v->pos)].attr = v->attr;
          vt102_cursor_advance (v);
        }
    }

  v->crt.pos = v->pos;
  v->crt.hide_cursor =
    v->private_modes[VT102_PRIVATE_MODE_SHOW_CURSOR] ? 0 : 1;

  if (v->current_line.y != v->pos.y)
    {
      vt102_log_line (v, v->current_line.y);
      v->current_line = v->pos;
    }

  vt102_status_line (v, "VT102 foo bar baz I'm the urban spaceman baby");
}

vt102_parse (VT102 * v, char *buf, int len)
{
  while (len--)
    vt102_parse_char (v, *(buf++));
}


void
vt102_parser_reset (VT102_parser * p)
{
  p->in_csi = 0;
  p->in_escape = 0;
  p->csi_ptr = 0;
}


void
vt102_send (VT102 * v, uint8_t key)
{
  uint8_t c;
#if 0
  fprintf (stderr, "vts: %d(%c)\n", key, (key > 31) ? key : ' ');
#endif
  if ((key > 31) && (key < 127))
    {
      tty_write (v->tty, &key, 1);
      return;
    }

  switch (key)
    {
     /*NUL*/ case 0:
     /*SOH*/ case 1:
     /*STX*/ case 2:
     /*ETX*/ case 3:
     /*EOT*/ case 4:
     /*ENQ*/ case 5:
     /*ACK*/ case 6:
     /*BEL*/ case 7:
     /*BS*/ case 8:
     /*HT*/ case 9:
     /*LF*/ case 10:
     /*VT*/ case 11:
     /*FF*/ case 12:
      tty_write (v->tty, &key, 1);
      break;
     /*CR*/ case 13:
      tty_write (v->tty, &key, 1);
      if (v->modes[VT102_MODE_NEWLINE_MODE])
        {
          c = 10;
          tty_write (v->tty, &c, 1);
        }
      break;
     /*SO*/ case 14:
     /*SI*/ case 15:
     /*DLE*/ case 16:
    /*DC1 */ case 17:
    /*DC2 */ case 18:
    /*DC3 */ case 19:
    /*DC4 */ case 20:
     /*NAK*/ case 21:
     /*SYN*/ case 22:
     /*ETB*/ case 23:
     /*CAN*/ case 24:
     /*EM*/ case 25:
     /*SUB*/ case 26:
      tty_write (v->tty, &key, 1);
      break;
     /*ESC*/ case 27:
     /*FS*/ case 28:
     /*GS*/ case 29:
     /*RS*/ case 30:
     /*US*/ case 31:
     /*DEL*/ case 127:
      tty_write (v->tty, &key, 1);
      break;

    case KEY_UP:
    case KEY_DOWN:
    case KEY_RIGHT:
    case KEY_LEFT:
    case KEY_HOME:
    case KEY_MIDDLE:
    case KEY_END:

      if (v->private_modes[VT102_PRIVATE_MODE_CURSOR_MODE])
        {
          uint8_t buf[] = { 033, 'O', 'A' + (key - KEY_UP) };
          tty_write (v->tty, &buf, sizeof (buf));
        }
      else
        {
          uint8_t buf[] = { 033, '[', 'A' + (key - KEY_UP) };
          tty_write (v->tty, &buf, sizeof (buf));
        }
      break;
    case KEY_STAR:
    case KEY_PLUS:
    case KEY_COMMA:
    case KEY_PERIOD:
    case KEY_DIVIDE:
    case KEY_0:
    case KEY_1:
    case KEY_2:
    case KEY_3:
    case KEY_4:
    case KEY_5:
    case KEY_6:
    case KEY_7:
    case KEY_8:
    case KEY_9:
      if (v->application_keypad_mode)
        {
          uint8_t buf[] = { 033, 'O', 'a' + (key - KEY_154) };
          tty_write (v->tty, &buf, sizeof (buf));
        }
      else
        {
          static char kpoff[KEY_NUM] = {
            [KEY_STAR] = '*',
            [KEY_PLUS] = '+',
            [KEY_COMMA] = ',',
            [KEY_MINUS] = '-',
            [KEY_PERIOD] = '.',
            [KEY_DIVIDE] = '/',
            [KEY_0] = '0',
            [KEY_1] = '1',
            [KEY_2] = '2',
            [KEY_3] = '3',
            [KEY_4] = '4',
            [KEY_5] = '5',
            [KEY_6] = '6',
            [KEY_7] = '7',
            [KEY_8] = '8',
            [KEY_9] = '9'
          };

          tty_write (v->tty, &kpoff[key], 1);
        }
      break;
    case KEY_ENTER:
      if (v->application_keypad_mode)
        {
          uint8_t buf[] = { 033, 'O', 'M' };
          tty_write (v->tty, &buf, sizeof (buf));
        }
      else
        {
          c = 13;
          tty_write (v->tty, &c, 1);
          if (v->modes[VT102_MODE_NEWLINE_MODE])
            {
              c = 10;
              tty_write (v->tty, &c, 1);
            }
        }
      break;
    case KEY_PF1:
    case KEY_PF2:
    case KEY_PF3:
    case KEY_PF4:
      {
        uint8_t buf[] = { 033, 'O', 'P' + (key - KEY_PF1) };
        tty_write (v->tty, &buf, sizeof (buf));
      }
      break;
    case KEY_INSERT:
    case KEY_DELETE:
    case KEY_PGUP:
    case KEY_PGDN:
      {
        uint8_t buf[] = { 033, '[', '0' + (key - KEY_180), '~' };
        tty_write (v->tty, &buf, sizeof (buf));
      }
      break;
    }

}

void
vt102_reset (VT102 * v)
{
  VT102_parser *p = &v->parser;

  vt102_parser_reset (p);
  crt_cls (&v->crt);


  v->application_keypad_mode = 0;

  v->current_line = v->pos;
  v->pending_wrap = 0;

  v->screen_start.x = 0;
  v->screen_start.y = 0;
  v->screen_end.x = VT102_COLS - 1;
  v->screen_end.y = VT102_ROWS - 1;

  v->top_margin = v->screen_start;
  v->bottom_margin = v->screen_end;

  memset (v->modes, 0, VT102_NMODES);
  memset (v->private_modes, 0, VT102_NMODES);

  v->private_modes[VT102_PRIVATE_MODE_AUTO_WRAP] = 1;
  v->private_modes[VT102_PRIVATE_MODE_AUTO_REPEAT] = 1;
  v->private_modes[VT102_PRIVATE_MODE_SHOW_CURSOR] = 1;
  v->modes[VT102_MODE_LOCAL_ECHO_OFF] = 1;

  vt102_cursor_home (v);
  vt102_reset_tabs (v);
  v->current_line = v->pos;

  vt102_save_state (v);

  vt102_status_line (v, "VT102 foo bar baz I'm the urban spaceman baby");

}

int
vt102_dispatch (VT102 * v)
{
  char buf[1024];
  int red;

  red = tty_read (v->tty, buf, sizeof (buf));

  if (red < 0)
    return -1;
  if (!red)
    return 0;


  vt102_parse (v, buf, red);

  return 0;
}

VT102 *
vt102_new (TTY * t)
{
  VT102 *v;

  v = (VT102 *) malloc (sizeof (VT102));

  vt102_reset (v);

  v->tty = t;

  return v;
}

void
vt102_free (VT102 * v)
{
  free (v);
}