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terminal.c

/*
 * Copyright © 2008 Kristian Høgsberg
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>
#include <time.h>
#include <pty.h>
#include <ctype.h>
#include <cairo.h>
#include <glib.h>

#include <X11/keysym.h>

#include "wayland-util.h"
#include "wayland-client.h"
#include "wayland-glib.h"

#include "window.h"

static int option_fullscreen;

#define MOD_SHIFT 0x01
#define MOD_ALT         0x02
#define MOD_CTRL  0x04

#define ATTRMASK_BOLD         0x01
#define ATTRMASK_UNDERLINE    0x02
#define ATTRMASK_BLINK        0x04
#define ATTRMASK_INVERSE      0x08
#define ATTRMASK_CONCEALED    0x10

/* Buffer sizes */
#define MAX_RESPONSE          256
#define MAX_ESCAPE            255

/* Terminal modes */
#define MODE_SHOW_CURSOR      0x00000001
#define MODE_INVERSE          0x00000002
#define MODE_AUTOWRAP         0x00000004
#define MODE_AUTOREPEAT       0x00000008
#define MODE_LF_NEWLINE       0x00000010
#define MODE_IRM        0x00000020
#define MODE_DELETE_SENDS_DEL 0x00000040
#define MODE_ALT_SENDS_ESC    0x00000080

00070 union utf8_char {
      unsigned char byte[4];
      uint32_t ch;
};

enum utf8_state {
      utf8state_start,
      utf8state_accept,
      utf8state_reject,
      utf8state_expect3,
      utf8state_expect2,
      utf8state_expect1
};

00084 struct utf8_state_machine {
      enum utf8_state state;
      int len;
      union utf8_char s;
};

static void
init_state_machine(struct utf8_state_machine *machine)
{
      machine->state = utf8state_start;
      machine->len = 0;
      machine->s.ch = 0;
}

static enum utf8_state
utf8_next_char(struct utf8_state_machine *machine, char c)
{
      switch(machine->state) {
      case utf8state_start:
      case utf8state_accept:
      case utf8state_reject:
            machine->s.ch = 0;
            machine->len = 0;
            if(c == 0xC0 || c == 0xC1) {
                  /* overlong encoding, reject */
                  machine->state = utf8state_reject;
            } else if((c & 0x80) == 0) {
                  /* single byte, accept */
                  machine->s.byte[machine->len++] = c;
                  machine->state = utf8state_accept;
            } else if((c & 0xC0) == 0x80) {
                  /* parser out of sync, ignore byte */
                  machine->state = utf8state_start;
            } else if((c & 0xE0) == 0xC0) {
                  /* start of two byte sequence */
                  machine->s.byte[machine->len++] = c;
                  machine->state = utf8state_expect1;
            } else if((c & 0xF0) == 0xE0) {
                  /* start of three byte sequence */
                  machine->s.byte[machine->len++] = c;
                  machine->state = utf8state_expect2;
            } else if((c & 0xF8) == 0xF0) {
                  /* start of four byte sequence */
                  machine->s.byte[machine->len++] = c;
                  machine->state = utf8state_expect3;
            } else {
                  /* overlong encoding, reject */
                  machine->state = utf8state_reject;
            }
            break;
      case utf8state_expect3:
            machine->s.byte[machine->len++] = c;
            if((c & 0xC0) == 0x80) {
                  /* all good, continue */
                  machine->state = utf8state_expect2;
            } else {
                  /* missing extra byte, reject */
                  machine->state = utf8state_reject;
            }
            break;
      case utf8state_expect2:
            machine->s.byte[machine->len++] = c;
            if((c & 0xC0) == 0x80) {
                  /* all good, continue */
                  machine->state = utf8state_expect1;
            } else {
                  /* missing extra byte, reject */
                  machine->state = utf8state_reject;
            }
            break;
      case utf8state_expect1:
            machine->s.byte[machine->len++] = c;
            if((c & 0xC0) == 0x80) {
                  /* all good, accept */
                  machine->state = utf8state_accept;
            } else {
                  /* missing extra byte, reject */
                  machine->state = utf8state_reject;
            }
            break;
      default:
            machine->state = utf8state_reject;
            break;
      }
      
      return machine->state;
}

00172 struct char_sub {
      union utf8_char match;
      union utf8_char replace;
};
/* Set last char_sub match to NULL char */
typedef struct char_sub *character_set;

struct char_sub CS_US[] = {
      {{{0, }}, {{0, }}}
};
static struct char_sub CS_UK[] = {
      {{{'#', 0, }}, {{0xC2, 0xA3, 0, }}},
      {{{0, }}, {{0, }}}
};
static struct char_sub CS_SPECIAL[] = {
      {{{'`', 0, }}, {{0xE2, 0x99, 0xA6, 0}}}, /* diamond */
      {{{'a', 0, }}, {{0xE2, 0x96, 0x92, 0}}}, /* 50% cell */
      {{{'b', 0, }}, {{0xE2, 0x90, 0x89, 0}}}, /* HT */
      {{{'c', 0, }}, {{0xE2, 0x90, 0x8C, 0}}}, /* FF */
      {{{'d', 0, }}, {{0xE2, 0x90, 0x8D, 0}}}, /* CR */
      {{{'e', 0, }}, {{0xE2, 0x90, 0x8A, 0}}}, /* LF */
      {{{'f', 0, }}, {{0xC2, 0xB0, 0, }}}, /* Degree */
      {{{'g', 0, }}, {{0xC2, 0xB1, 0, }}}, /* Plus/Minus */
      {{{'h', 0, }}, {{0xE2, 0x90, 0xA4, 0}}}, /* NL */
      {{{'i', 0, }}, {{0xE2, 0x90, 0x8B, 0}}}, /* VT */
      {{{'j', 0, }}, {{0xE2, 0x94, 0x98, 0}}}, /* CN_RB */
      {{{'k', 0, }}, {{0xE2, 0x94, 0x90, 0}}}, /* CN_RT */
      {{{'l', 0, }}, {{0xE2, 0x94, 0x8C, 0}}}, /* CN_LT */
      {{{'m', 0, }}, {{0xE2, 0x94, 0x94, 0}}}, /* CN_RB */
      {{{'n', 0, }}, {{0xE2, 0x94, 0xBC, 0}}}, /* CROSS */
      {{{'o', 0, }}, {{0xE2, 0x94, 0x80, 0}}}, /* H */
      {{{'p', 0, }}, {{0xE2, 0x94, 0x80, 0}}}, /* H */
      {{{'q', 0, }}, {{0xE2, 0x94, 0x80, 0}}}, /* H */
      {{{'r', 0, }}, {{0xE2, 0x94, 0x80, 0}}}, /* H */
      {{{'s', 0, }}, {{0xE2, 0x94, 0x80, 0}}}, /* H */
      {{{'t', 0, }}, {{0xE2, 0x94, 0x9C, 0}}}, /* TR */
      {{{'u', 0, }}, {{0xE2, 0x94, 0xA4, 0}}}, /* TL */
      {{{'v', 0, }}, {{0xE2, 0x94, 0xB4, 0}}}, /* TU */
      {{{'w', 0, }}, {{0xE2, 0x94, 0xAC, 0}}}, /* TD */
      {{{'x', 0, }}, {{0xE2, 0x94, 0x82, 0}}}, /* V */
      {{{'y', 0, }}, {{0xE2, 0x89, 0xA4, 0}}}, /* LE */
      {{{'z', 0, }}, {{0xE2, 0x89, 0xA5, 0}}}, /* GE */
      {{{'{', 0, }}, {{0xCF, 0x80, 0, }}}, /* PI */
      {{{'|', 0, }}, {{0xE2, 0x89, 0xA0, 0}}}, /* NEQ */
      {{{'}', 0, }}, {{0xC2, 0xA3, 0, }}}, /* POUND */
      {{{'~', 0, }}, {{0xE2, 0x8B, 0x85, 0}}}, /* DOT */
      {{{0, }}, {{0, }}}
};

static void
apply_char_set(character_set cs, union utf8_char *utf8)
{
      int i = 0;
      
      while (cs[i].match.byte[0]) {
            if ((*utf8).ch == cs[i].match.ch) {
                  *utf8 = cs[i].replace;
                  break;
            }
            i++;
      }
}

00235 struct key_map {
      int sym;
      int num;
      char escape;
      char code;
};
/* Set last key_sub sym to NULL */
typedef struct key_map *keyboard_mode;

static struct key_map KM_NORMAL[] = {
      {XK_Left,  1, '[', 'D'},
      {XK_Right, 1, '[', 'C'},
      {XK_Up,    1, '[', 'A'},
      {XK_Down,  1, '[', 'B'},
      {XK_Home,  1, '[', 'H'},
      {XK_End,   1, '[', 'F'},
      {0, 0, 0, 0}
};
static struct key_map KM_APPLICATION[] = {
      {XK_Left,          1, 'O', 'D'},
      {XK_Right,         1, 'O', 'C'},
      {XK_Up,            1, 'O', 'A'},
      {XK_Down,          1, 'O', 'B'},
      {XK_Home,          1, 'O', 'H'},
      {XK_End,           1, 'O', 'F'},
      {XK_KP_Enter,      1, 'O', 'M'},
      {XK_KP_Multiply,   1, 'O', 'j'},
      {XK_KP_Add,        1, 'O', 'k'},
      {XK_KP_Separator,  1, 'O', 'l'},
      {XK_KP_Subtract,   1, 'O', 'm'},
      {XK_KP_Divide,     1, 'O', 'o'},
      {0, 0, 0, 0}
};

static int
function_key_response(char escape, int num, uint32_t modifiers,
                  char code, char *response)
{
      int mod_num = 0;
      int len;

      if (modifiers & XKB_COMMON_SHIFT_MASK) mod_num   |= 1;
      if (modifiers & XKB_COMMON_MOD1_MASK) mod_num    |= 2;
      if (modifiers & XKB_COMMON_CONTROL_MASK) mod_num |= 4;

      if (mod_num != 0)
            len = snprintf(response, MAX_RESPONSE, "\e[%d;%d%c",
                         num, mod_num + 1, code);
      else if (code != '~')
            len = snprintf(response, MAX_RESPONSE, "\e%c%c",
                         escape, code);
      else
            len = snprintf(response, MAX_RESPONSE, "\e%c%d%c",
                         escape, num, code);

      if (len >= MAX_RESPONSE)      return MAX_RESPONSE - 1;
      else                    return len;
}

/* returns the number of bytes written into response,
 * which must have room for MAX_RESPONSE bytes */
static int
apply_key_map(keyboard_mode mode, int sym, uint32_t modifiers, char *response)
{
      struct key_map map;
      int len = 0;
      int i = 0;
      
      while (mode[i].sym) {
            map = mode[i++];
            if (sym == map.sym) {
                  len = function_key_response(map.escape, map.num,
                                        modifiers, map.code,
                                        response);
                  break;
            }
      }
      
      return len;
}

00316 struct terminal_color { double r, g, b, a; };
00317 struct attr {
      unsigned char fg, bg;
      char a;        /* attributes format:
                      * 76543210
                  *    cilub */
      char s;        /* in selection */
};
00324 struct color_scheme {
      struct terminal_color palette[16];
      char border;
      struct attr default_attr;
};

static void
attr_init(struct attr *data_attr, struct attr attr, int n)
{
      int i;
      for (i = 0; i < n; i++) {
            data_attr[i] = attr;
      }
}

enum escape_state {
      escape_state_normal = 0,
      escape_state_escape,
      escape_state_dcs,
      escape_state_csi,
      escape_state_osc,
      escape_state_inner_escape,
      escape_state_ignore,
      escape_state_special
};

#define ESC_FLAG_WHAT   0x01
#define ESC_FLAG_GT     0x02
#define ESC_FLAG_BANG   0x04
#define ESC_FLAG_CASH   0x08
#define ESC_FLAG_SQUOTE 0x10
#define ESC_FLAG_DQUOTE 0x20
#define ESC_FLAG_SPACE  0x40

00358 struct terminal {
      struct window *window;
      struct display *display;
      union utf8_char *data;
      char *tab_ruler;
      struct attr *data_attr;
      struct attr curr_attr;
      uint32_t mode;
      char origin_mode;
      char saved_origin_mode;
      struct attr saved_attr;
      union utf8_char last_char;
      int margin_top, margin_bottom;
      character_set cs, g0, g1;
      character_set saved_cs, saved_g0, saved_g1;
      keyboard_mode key_mode;
      int data_pitch, attr_pitch;  /* The width in bytes of a line */
      int width, height, start, row, column;
      int saved_row, saved_column;
      int fd, master;
      GIOChannel *channel;
      uint32_t modifiers;
      char escape[MAX_ESCAPE+1];
      int escape_length;
      enum escape_state state;
      enum escape_state outer_state;
      int escape_flags;
      struct utf8_state_machine state_machine;
      int margin;
      int fullscreen;
      int focused;
      struct color_scheme *color_scheme;
      struct terminal_color color_table[256];
      cairo_font_extents_t extents;
      cairo_scaled_font_t *font_normal, *font_bold;

      struct wl_selection *selection;
      struct wl_selection_offer *selection_offer;
      uint32_t selection_offer_has_text;
      int32_t dragging, selection_active;
      int selection_start_x, selection_start_y;
      int selection_end_x, selection_end_y;
};

/* Create default tab stops, every 8 characters */
static void
terminal_init_tabs(struct terminal *terminal)
{
      int i = 0;
      
      while (i < terminal->width) {
            if (i % 8 == 0)
                  terminal->tab_ruler[i] = 1;
            else
                  terminal->tab_ruler[i] = 0;
            i++;
      }
}

static void
terminal_init(struct terminal *terminal)
{
      terminal->curr_attr = terminal->color_scheme->default_attr;
      terminal->origin_mode = 0;
      terminal->mode = MODE_SHOW_CURSOR |
                   MODE_AUTOREPEAT |
                   MODE_ALT_SENDS_ESC |
                   MODE_AUTOWRAP;

      terminal->row = 0;
      terminal->column = 0;

      terminal->g0 = CS_US;
      terminal->g1 = CS_US;
      terminal->cs = terminal->g0;
      terminal->key_mode = KM_NORMAL;

      terminal->saved_g0 = terminal->g0;
      terminal->saved_g1 = terminal->g1;
      terminal->saved_cs = terminal->cs;

      terminal->saved_attr = terminal->curr_attr;
      terminal->saved_origin_mode = terminal->origin_mode;
      terminal->saved_row = terminal->row;
      terminal->saved_column = terminal->column;

      if (terminal->tab_ruler != NULL) terminal_init_tabs(terminal);
}

static void
init_color_table(struct terminal *terminal)
{
      int c, r;
      struct terminal_color *color_table = terminal->color_table;

      for (c = 0; c < 256; c ++) {
            if (c < 16) {
                  color_table[c] = terminal->color_scheme->palette[c];
            } else if (c < 232) {
                  r = c - 16;
                  color_table[c].b = ((double)(r % 6) / 6.0); r /= 6;
                  color_table[c].g = ((double)(r % 6) / 6.0); r /= 6;
                  color_table[c].r = ((double)(r % 6) / 6.0);
                  color_table[c].a = 1.0;
            } else {
                  r = (c - 232) * 10 + 8;
                  color_table[c].r = ((double) r) / 256.0;
                  color_table[c].g = color_table[c].r;
                  color_table[c].b = color_table[c].r;
                  color_table[c].a = 1.0;
            }
      }
}

static union utf8_char *
terminal_get_row(struct terminal *terminal, int row)
{
      int index;

      index = (row + terminal->start) % terminal->height;

      return &terminal->data[index * terminal->width];
}

static struct attr*
terminal_get_attr_row(struct terminal *terminal, int row)
{
      int index;

      index = (row + terminal->start) % terminal->height;

      return &terminal->data_attr[index * terminal->width];
}

00492 union decoded_attr {
      struct attr attr;
      uint32_t key;
};

static int
terminal_compare_position(struct terminal *terminal,
                    int x, int y, int32_t ref_row, int32_t ref_col)
{
      struct rectangle allocation;
      int top_margin, side_margin, col, row, ref_x;

      window_get_child_allocation(terminal->window, &allocation);
      side_margin = allocation.x + (allocation.width - terminal->width * terminal->extents.max_x_advance) / 2;
      top_margin = allocation.y + (allocation.height - terminal->height * terminal->extents.height) / 2;

      col = (x - side_margin) / terminal->extents.max_x_advance;
      row = (y - top_margin) / terminal->extents.height;

      ref_x = side_margin + ref_col * terminal->extents.max_x_advance +
            terminal->extents.max_x_advance / 2;

      if (row < ref_row)
            return -1;
      if (row == ref_row) {
            if (col < ref_col)
                  return -1;
            if (col == ref_col && x < ref_x)
                  return -1;
      }

      return 1;
}

static void
terminal_decode_attr(struct terminal *terminal, int row, int col,
                 union decoded_attr *decoded)
{
      struct attr attr;
      int foreground, background, tmp;
      int start_cmp, end_cmp;

      start_cmp =
            terminal_compare_position(terminal,
                                terminal->selection_start_x,
                                terminal->selection_start_y,
                                row, col);
      end_cmp =
            terminal_compare_position(terminal,
                                terminal->selection_end_x,
                                terminal->selection_end_y,
                                row, col);
      decoded->attr.s = 0;
      if (start_cmp < 0 && end_cmp > 0)
            decoded->attr.s = 1;
      else if (end_cmp < 0 && start_cmp > 0)
            decoded->attr.s = 1;

      /* get the attributes for this character cell */
      attr = terminal_get_attr_row(terminal, row)[col];
      if ((attr.a & ATTRMASK_INVERSE) ||
          decoded->attr.s ||
          ((terminal->mode & MODE_SHOW_CURSOR) &&
           terminal->focused && terminal->row == row &&
           terminal->column == col)) {
            foreground = attr.bg;
            background = attr.fg;
            if (attr.a & ATTRMASK_BOLD) {
                  if (foreground <= 16) foreground |= 0x08;
                  if (background <= 16) background &= 0x07;
            }
      } else {
            foreground = attr.fg;
            background = attr.bg;
      }

      if (terminal->mode & MODE_INVERSE) {
            tmp = foreground;
            foreground = background;
            background = tmp;
            if (attr.a & ATTRMASK_BOLD) {
                  if (foreground <= 16) foreground |= 0x08;
                  if (background <= 16) background &= 0x07;
            }
      }

      decoded->attr.fg = foreground;
      decoded->attr.bg = background;
      decoded->attr.a = attr.a;
}


static void
terminal_scroll_buffer(struct terminal *terminal, int d)
{
      int i;

      d = d % (terminal->height + 1);
      terminal->start = (terminal->start + d) % terminal->height;
      if (terminal->start < 0) terminal->start = terminal->height + terminal->start;
      if(d < 0) {
            d = 0 - d;
            for(i = 0; i < d; i++) {
                  memset(terminal_get_row(terminal, i), 0, terminal->data_pitch);
                  attr_init(terminal_get_attr_row(terminal, i),
                      terminal->curr_attr, terminal->width);
            }
      } else {
            for(i = terminal->height - d; i < terminal->height; i++) {
                  memset(terminal_get_row(terminal, i), 0, terminal->data_pitch);
                  attr_init(terminal_get_attr_row(terminal, i),
                      terminal->curr_attr, terminal->width);
            }
      }
}

static void
terminal_scroll_window(struct terminal *terminal, int d)
{
      int i;
      int window_height;
      int from_row, to_row;
      
      // scrolling range is inclusive
      window_height = terminal->margin_bottom - terminal->margin_top + 1;
      d = d % (window_height + 1);
      if(d < 0) {
            d = 0 - d;
            to_row = terminal->margin_bottom;
            from_row = terminal->margin_bottom - d;
            
            for (i = 0; i < (window_height - d); i++) {
                  memcpy(terminal_get_row(terminal, to_row - i),
                         terminal_get_row(terminal, from_row - i),
                         terminal->data_pitch);
                  memcpy(terminal_get_attr_row(terminal, to_row - i),
                         terminal_get_attr_row(terminal, from_row - i),
                         terminal->attr_pitch);
            }
            for (i = terminal->margin_top; i < (terminal->margin_top + d); i++) {
                  memset(terminal_get_row(terminal, i), 0, terminal->data_pitch);
                  attr_init(terminal_get_attr_row(terminal, i),
                        terminal->curr_attr, terminal->width);
            }
      } else {
            to_row = terminal->margin_top;
            from_row = terminal->margin_top + d;
            
            for (i = 0; i < (window_height - d); i++) {
                  memcpy(terminal_get_row(terminal, to_row + i),
                         terminal_get_row(terminal, from_row + i),
                         terminal->data_pitch);
                  memcpy(terminal_get_attr_row(terminal, to_row + i),
                         terminal_get_attr_row(terminal, from_row + i),
                         terminal->attr_pitch);
            }
            for (i = terminal->margin_bottom - d + 1; i <= terminal->margin_bottom; i++) {
                  memset(terminal_get_row(terminal, i), 0, terminal->data_pitch);
                  attr_init(terminal_get_attr_row(terminal, i),
                        terminal->curr_attr, terminal->width);
            }
      }
}

static void
terminal_scroll(struct terminal *terminal, int d)
{
      if(terminal->margin_top == 0 && terminal->margin_bottom == terminal->height - 1)
            terminal_scroll_buffer(terminal, d);
      else
            terminal_scroll_window(terminal, d);
}

static void
terminal_shift_line(struct terminal *terminal, int d)
{
      union utf8_char *row;
      struct attr *attr_row;
      
      row = terminal_get_row(terminal, terminal->row);
      attr_row = terminal_get_attr_row(terminal, terminal->row);

      if ((terminal->width + d) <= terminal->column)
            d = terminal->column + 1 - terminal->width;
      if ((terminal->column + d) >= terminal->width)
            d = terminal->width - terminal->column - 1;
      
      if (d < 0) {
            d = 0 - d;
            memmove(&row[terminal->column],
                    &row[terminal->column + d],
                  (terminal->width - terminal->column - d) * sizeof(union utf8_char));
            memmove(&attr_row[terminal->column], &attr_row[terminal->column + d],
                    (terminal->width - terminal->column - d) * sizeof(struct attr));
            memset(&row[terminal->width - d], 0, d * sizeof(union utf8_char));
            attr_init(&attr_row[terminal->width - d], terminal->curr_attr, d);
      } else {
            memmove(&row[terminal->column + d], &row[terminal->column],
                  (terminal->width - terminal->column - d) * sizeof(union utf8_char));
            memmove(&attr_row[terminal->column + d], &attr_row[terminal->column],
                  (terminal->width - terminal->column - d) * sizeof(struct attr));
            memset(&row[terminal->column], 0, d * sizeof(union utf8_char));
            attr_init(&attr_row[terminal->column], terminal->curr_attr, d);
      }
}

static void
terminal_resize(struct terminal *terminal, int width, int height)
{
      size_t size;
      union utf8_char *data;
      struct attr *data_attr;
      char *tab_ruler;
      int data_pitch, attr_pitch;
      int i, l, total_rows;
      struct rectangle allocation;
      struct winsize ws;
      int32_t pixel_width, pixel_height;

      if (width < 1)
            width = 1;
      if (height < 1)
            height = 1;
      if (terminal->width == width && terminal->height == height)
            return;

      if (!terminal->fullscreen) {
            pixel_width = width *
                  terminal->extents.max_x_advance + 2 * terminal->margin;
            pixel_height = height *
                  terminal->extents.height + 2 * terminal->margin;
            window_set_child_size(terminal->window,
                              pixel_width, pixel_height);
      }

      window_schedule_redraw (terminal->window);

      data_pitch = width * sizeof(union utf8_char);
      size = data_pitch * height;
      data = malloc(size);
      attr_pitch = width * sizeof(struct attr);
      data_attr = malloc(attr_pitch * height);
      tab_ruler = malloc(width);
      memset(data, 0, size);
      memset(tab_ruler, 0, width);
      attr_init(data_attr, terminal->curr_attr, width * height);
      if (terminal->data && terminal->data_attr) {
            if (width > terminal->width)
                  l = terminal->width;
            else
                  l = width;

            if (terminal->height > height) {
                  total_rows = height;
            } else {
                  total_rows = terminal->height;
            }

            for (i = 0; i < total_rows; i++) {
                  memcpy(&data[width * i],
                         terminal_get_row(terminal, i),
                         l * sizeof(union utf8_char));
                  memcpy(&data_attr[width * i],
                         terminal_get_attr_row(terminal, i),
                         l * sizeof(struct attr));
            }

            free(terminal->data);
            free(terminal->data_attr);
            free(terminal->tab_ruler);
      }

      terminal->data_pitch = data_pitch;
      terminal->attr_pitch = attr_pitch;
      terminal->margin_bottom =
            height - (terminal->height - terminal->margin_bottom);
      terminal->width = width;
      terminal->height = height;
      terminal->data = data;
      terminal->data_attr = data_attr;
      terminal->tab_ruler = tab_ruler;
      terminal_init_tabs(terminal);

      /* Update the window size */
      ws.ws_row = terminal->height;
      ws.ws_col = terminal->width;
      window_get_child_allocation(terminal->window, &allocation);
      ws.ws_xpixel = allocation.width;
      ws.ws_ypixel = allocation.height;
      ioctl(terminal->master, TIOCSWINSZ, &ws);
}

struct color_scheme DEFAULT_COLORS = {
      {
            {0,    0,    0,    1}, /* black */
            {0.66, 0,    0,    1}, /* red */
            {0  ,  0.66, 0,    1}, /* green */
            {0.66, 0.33, 0,    1}, /* orange (nicer than muddy yellow) */
            {0  ,  0  ,  0.66, 1}, /* blue */
            {0.66, 0  ,  0.66, 1}, /* magenta */
            {0,    0.66, 0.66, 1}, /* cyan */
            {0.66, 0.66, 0.66, 1}, /* light grey */
            {0.22, 0.33, 0.33, 1}, /* dark grey */
            {1,    0.33, 0.33, 1}, /* high red */
            {0.33, 1,    0.33, 1}, /* high green */
            {1,    1,    0.33, 1}, /* high yellow */
            {0.33, 0.33, 1,    1}, /* high blue */
            {1,    0.33, 1,    1}, /* high magenta */
            {0.33, 1,    1,    1}, /* high cyan */
            {1,    1,    1,    1}  /* white */
      },
      0,                             /* black border */
      {7, 0, 0, }                    /* bg:black (0), fg:light gray (7)  */
};

static void
terminal_set_color(struct terminal *terminal, cairo_t *cr, int index)
{
      cairo_set_source_rgba(cr,
                        terminal->color_table[index].r,
                        terminal->color_table[index].g,
                        terminal->color_table[index].b,
                        terminal->color_table[index].a);
}

static void
terminal_send_selection(struct terminal *terminal, int fd)
{
      int row, col;
      union utf8_char *p_row;
      union decoded_attr attr;
      FILE *fp;
      int len;

      fp = fdopen(fd, "w");
      for (row = 0; row < terminal->height; row++) {
            p_row = terminal_get_row(terminal, row);
            for (col = 0; col < terminal->width; col++) {
                  /* get the attributes for this character cell */
                  terminal_decode_attr(terminal, row, col, &attr);
                  if (!attr.attr.s)
                        continue;
                  len = strnlen((char *) p_row[col].byte, 4);
                  fwrite(p_row[col].byte, 1, len, fp);
            }
      }
      fclose(fp);
}

00841 struct glyph_run {
      struct terminal *terminal;
      cairo_t *cr;
      int count;
      union decoded_attr attr;
      cairo_glyph_t glyphs[256], *g;
};

static void
glyph_run_init(struct glyph_run *run, struct terminal *terminal, cairo_t *cr)
{
      run->terminal = terminal;
      run->cr = cr;
      run->g = run->glyphs;
      run->count = 0;
      run->attr.key = 0;
}

static void
glyph_run_flush(struct glyph_run *run, union decoded_attr attr)
{
      cairo_scaled_font_t *font;

      if (run->count > ARRAY_LENGTH(run->glyphs) - 10 ||
          (attr.key != run->attr.key)) {
            if (run->attr.attr.a & (ATTRMASK_BOLD | ATTRMASK_BLINK))
                  font = run->terminal->font_bold;
            else
                  font = run->terminal->font_normal;
            cairo_set_scaled_font(run->cr, font);
            terminal_set_color(run->terminal, run->cr,
                           run->attr.attr.fg);

            if (!(run->attr.attr.a & ATTRMASK_CONCEALED))
                  cairo_show_glyphs (run->cr, run->glyphs, run->count);
            run->g = run->glyphs;
            run->count = 0;
      }
      run->attr = attr;
}

static void
glyph_run_add(struct glyph_run *run, int x, int y, union utf8_char *c)
{
      int num_glyphs;
      cairo_scaled_font_t *font;

      num_glyphs = ARRAY_LENGTH(run->glyphs) - run->count;

      if (run->attr.attr.a & (ATTRMASK_BOLD | ATTRMASK_BLINK))
            font = run->terminal->font_bold;
      else
            font = run->terminal->font_normal;

      cairo_move_to(run->cr, x, y);
      cairo_scaled_font_text_to_glyphs (font, x, y,
                                (char *) c->byte, 4,
                                &run->g, &num_glyphs,
                                NULL, NULL, NULL);
      run->g += num_glyphs;
      run->count += num_glyphs;
}

static void
terminal_draw_contents(struct terminal *terminal)
{
      struct rectangle allocation;
      cairo_t *cr;
      int top_margin, side_margin;
      int row, col;
      union utf8_char *p_row;
      union decoded_attr attr;
      int text_x, text_y;
      cairo_surface_t *surface;
      double d;
      struct glyph_run run;
      cairo_font_extents_t extents;

      surface = window_get_surface(terminal->window);
      window_get_child_allocation(terminal->window, &allocation);
      cr = cairo_create(surface);
      cairo_rectangle(cr, allocation.x, allocation.y,
                  allocation.width, allocation.height);
      cairo_clip(cr);
      cairo_push_group(cr);

      cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
      terminal_set_color(terminal, cr, terminal->color_scheme->border);
      cairo_paint(cr);

      cairo_set_scaled_font(cr, terminal->font_normal);

      extents = terminal->extents;
      side_margin = (allocation.width - terminal->width * extents.max_x_advance) / 2;
      top_margin = (allocation.height - terminal->height * extents.height) / 2;

      cairo_set_line_width(cr, 1.0);
      cairo_translate(cr, allocation.x + side_margin,
                  allocation.y + top_margin);
      /* paint the background */
      for (row = 0; row < terminal->height; row++) {
            for (col = 0; col < terminal->width; col++) {
                  /* get the attributes for this character cell */
                  terminal_decode_attr(terminal, row, col, &attr);

                  if (attr.attr.bg == terminal->color_scheme->border)
                        continue;

                  terminal_set_color(terminal, cr, attr.attr.bg);
                  cairo_move_to(cr, col * extents.max_x_advance,
                              row * extents.height);
                  cairo_rel_line_to(cr, extents.max_x_advance, 0);
                  cairo_rel_line_to(cr, 0, extents.height);
                  cairo_rel_line_to(cr, -extents.max_x_advance, 0);
                  cairo_close_path(cr);
                  cairo_fill(cr);
            }
      }

      cairo_set_operator(cr, CAIRO_OPERATOR_OVER);

      /* paint the foreground */
      glyph_run_init(&run, terminal, cr);
      for (row = 0; row < terminal->height; row++) {
            p_row = terminal_get_row(terminal, row);
            for (col = 0; col < terminal->width; col++) {
                  /* get the attributes for this character cell */
                  terminal_decode_attr(terminal, row, col, &attr);

                  glyph_run_flush(&run, attr);

                  text_x = col * extents.max_x_advance;
                  text_y = extents.ascent + row * extents.height;
                  if (attr.attr.a & ATTRMASK_UNDERLINE) {
                        terminal_set_color(terminal, cr, attr.attr.fg);
                        cairo_move_to(cr, text_x, (double)text_y + 1.5);
                        cairo_line_to(cr, text_x + extents.max_x_advance, (double) text_y + 1.5);
                        cairo_stroke(cr);
                  }

                  glyph_run_add(&run, text_x, text_y, &p_row[col]);
            }
      }

      attr.key = ~0;
      glyph_run_flush(&run, attr);

      if ((terminal->mode & MODE_SHOW_CURSOR) && !terminal->focused) {
            d = 0.5;

            cairo_set_line_width(cr, 1);
            cairo_move_to(cr, terminal->column * extents.max_x_advance + d,
                        terminal->row * extents.height + d);
            cairo_rel_line_to(cr, extents.max_x_advance - 2 * d, 0);
            cairo_rel_line_to(cr, 0, extents.height - 2 * d);
            cairo_rel_line_to(cr, -extents.max_x_advance + 2 * d, 0);
            cairo_close_path(cr);

            cairo_stroke(cr);
      }

      cairo_pop_group_to_source(cr);
      cairo_paint(cr);
      cairo_destroy(cr);
      cairo_surface_destroy(surface);
}

static void
resize_handler(struct window *window,
             int32_t pixel_width, int32_t pixel_height, void *data)
{
      struct terminal *terminal = data;
      int32_t width, height;

      width = (pixel_width - 2 * terminal->margin) /
            (int32_t) terminal->extents.max_x_advance;
      height = (pixel_height - 2 * terminal->margin) /
            (int32_t) terminal->extents.height;

      if (terminal->fullscreen)
            window_set_child_size(terminal->window,
                              pixel_width, pixel_height);

      terminal_resize(terminal, width, height);
}

static void
terminal_draw(struct terminal *terminal)
{
      window_draw(terminal->window);
      terminal_draw_contents(terminal);
      window_flush(terminal->window);
}

static void
redraw_handler(struct window *window, void *data)
{
      struct terminal *terminal = data;

      terminal_draw(terminal);
}

static void
terminal_data(struct terminal *terminal, const char *data, size_t length);

static void
handle_char(struct terminal *terminal, union utf8_char utf8);

static void
handle_sgr(struct terminal *terminal, int code);

static void
handle_term_parameter(struct terminal *terminal, int code, int sr)
{
      int i;

      if (terminal->escape_flags & ESC_FLAG_WHAT) {
            switch(code) {
            case 1:  /* DECCKM */
                  if (sr)     terminal->key_mode = KM_APPLICATION;
                  else  terminal->key_mode = KM_NORMAL;
                  break;
            case 2:  /* DECANM */
                  /* No VT52 support yet */
                  terminal->g0 = CS_US;
                  terminal->g1 = CS_US;
                  terminal->cs = terminal->g0;
                  break;
            case 3:  /* DECCOLM */
                  if (sr)
                        terminal_resize(terminal, 132, 24);
                  else
                        terminal_resize(terminal, 80, 24);
                  
                  /* set columns, but also home cursor and clear screen */
                  terminal->row = 0; terminal->column = 0;
                  for (i = 0; i < terminal->height; i++) {
                        memset(terminal_get_row(terminal, i),
                            0, terminal->data_pitch);
                        attr_init(terminal_get_attr_row(terminal, i),
                            terminal->curr_attr, terminal->width);
                  }
                  break;
            case 5:  /* DECSCNM */
                  if (sr)     terminal->mode |=  MODE_INVERSE;
                  else  terminal->mode &= ~MODE_INVERSE;
                  break;
            case 6:  /* DECOM */
                  terminal->origin_mode = sr;
                  if (terminal->origin_mode)
                        terminal->row = terminal->margin_top;
                  else
                        terminal->row = 0;
                  terminal->column = 0;
                  break;
            case 7:  /* DECAWM */
                  if (sr)     terminal->mode |=  MODE_AUTOWRAP;
                  else  terminal->mode &= ~MODE_AUTOWRAP;
                  break;
            case 8:  /* DECARM */
                  if (sr)     terminal->mode |=  MODE_AUTOREPEAT;
                  else  terminal->mode &= ~MODE_AUTOREPEAT;
                  break;
            case 25:
                  if (sr)     terminal->mode |=  MODE_SHOW_CURSOR;
                  else  terminal->mode &= ~MODE_SHOW_CURSOR;
                  break;
            case 1037:   /* deleteSendsDel */
                  if (sr)     terminal->mode |=  MODE_DELETE_SENDS_DEL;
                  else  terminal->mode &= ~MODE_DELETE_SENDS_DEL;
                  break;
            case 1039:   /* altSendsEscape */
                  if (sr)     terminal->mode |=  MODE_ALT_SENDS_ESC;
                  else  terminal->mode &= ~MODE_ALT_SENDS_ESC;
                  break;
            default:
                  fprintf(stderr, "Unknown parameter: ?%d\n", code);
                  break;
            }
      } else {
            switch(code) {
            case 4:  /* IRM */
                  if (sr)     terminal->mode |=  MODE_IRM;
                  else  terminal->mode &= ~MODE_IRM;
                  break;
            case 20: /* LNM */
                  if (sr)     terminal->mode |=  MODE_LF_NEWLINE;
                  else  terminal->mode &= ~MODE_LF_NEWLINE;
                  break;
            default:
                  fprintf(stderr, "Unknown parameter: %d\n", code);
                  break;
            }
      }
}

static void
handle_dcs(struct terminal *terminal)
{
}

static void
handle_osc(struct terminal *terminal)
{
      char *p;
      int code;

      terminal->escape[terminal->escape_length++] = '\0';
      p = &terminal->escape[2];
      code = strtol(p, &p, 10);
      if (*p == ';') p++;

      switch (code) {
      case 0: /* Icon name and window title */
      case 1: /* Icon label */
      case 2: /* Window title*/
            window_set_title(terminal->window, p);
            break;
      default:
            fprintf(stderr, "Unknown OSC escape code %d\n", code);
            break;
      }
}

static void
handle_escape(struct terminal *terminal)
{
      union utf8_char *row;
      struct attr *attr_row;
      char *p;
      int i, count, x, y, top, bottom;
      int args[10], set[10] = { 0, };
      char response[MAX_RESPONSE] = {0, };
      struct rectangle allocation;

      terminal->escape[terminal->escape_length++] = '\0';
      i = 0;
      p = &terminal->escape[2];
      while ((isdigit(*p) || *p == ';') && i < 10) {
            if (*p == ';') {
                  if (!set[i]) {
                        args[i] = 0;
                        set[i] = 1;
                  }
                  p++;
                  i++;
            } else {
                  args[i] = strtol(p, &p, 10);
                  set[i] = 1;
            }
      }
      
      switch (*p) {
      case '@':    /* ICH */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            terminal_shift_line(terminal, count);
            break;
      case 'A':    /* CUU */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            if (terminal->row - count >= terminal->margin_top)
                  terminal->row -= count;
            else
                  terminal->row = terminal->margin_top;
            break;
      case 'B':    /* CUD */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            if (terminal->row + count <= terminal->margin_bottom)
                  terminal->row += count;
            else
                  terminal->row = terminal->margin_bottom;
            break;
      case 'C':    /* CUF */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            if ((terminal->column + count) < terminal->width)
                  terminal->column += count;
            else
                  terminal->column = terminal->width - 1;
            break;
      case 'D':    /* CUB */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            if ((terminal->column - count) >= 0)
                  terminal->column -= count;
            else
                  terminal->column = 0;
            break;
      case 'E':    /* CNL */
            count = set[0] ? args[0] : 1;
            if (terminal->row + count <= terminal->margin_bottom)
                  terminal->row += count;
            else
                  terminal->row = terminal->margin_bottom;
            terminal->column = 0;
            break;
      case 'F':    /* CPL */
            count = set[0] ? args[0] : 1;
            if (terminal->row - count >= terminal->margin_top)
                  terminal->row -= count;
            else
                  terminal->row = terminal->margin_top;
            terminal->column = 0;
            break;
      case 'G':    /* CHA */
            y = set[0] ? args[0] : 1;
            y = y <= 0 ? 1 : y > terminal->width ? terminal->width : y;
            
            terminal->column = y - 1;
            break;
      case 'f':    /* HVP */
      case 'H':    /* CUP */
            x = (set[1] ? args[1] : 1) - 1;
            x = x < 0 ? 0 :
                (x >= terminal->width ? terminal->width - 1 : x);
            
            y = (set[0] ? args[0] : 1) - 1;
            if (terminal->origin_mode) {
                  y += terminal->margin_top;
                  y = y < terminal->margin_top ? terminal->margin_top :
                      (y > terminal->margin_bottom ? terminal->margin_bottom : y);
            } else {
                  y = y < 0 ? 0 :
                      (y >= terminal->height ? terminal->height - 1 : y);
            }
            
            terminal->row = y;
            terminal->column = x;
            break;
      case 'I':    /* CHT */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            while (count > 0 && terminal->column < terminal->width) {
                  if (terminal->tab_ruler[terminal->column]) count--;
                  terminal->column++;
            }
            terminal->column--;
            break;
      case 'J':    /* ED */
            row = terminal_get_row(terminal, terminal->row);
            attr_row = terminal_get_attr_row(terminal, terminal->row);
            if (!set[0] || args[0] == 0 || args[0] > 2) {
                  memset(&row[terminal->column],
                         0, (terminal->width - terminal->column) * sizeof(union utf8_char));
                  attr_init(&attr_row[terminal->column],
                         terminal->curr_attr, terminal->width - terminal->column);
                  for (i = terminal->row + 1; i < terminal->height; i++) {
                        memset(terminal_get_row(terminal, i),
                            0, terminal->data_pitch);
                        attr_init(terminal_get_attr_row(terminal, i),
                            terminal->curr_attr, terminal->width);
                  }
            } else if (args[0] == 1) {
                  memset(row, 0, (terminal->column+1) * sizeof(union utf8_char));
                  attr_init(attr_row, terminal->curr_attr, terminal->column+1);
                  for (i = 0; i < terminal->row; i++) {
                        memset(terminal_get_row(terminal, i),
                            0, terminal->data_pitch);
                        attr_init(terminal_get_attr_row(terminal, i),
                            terminal->curr_attr, terminal->width);
                  }
            } else if (args[0] == 2) {
                  for (i = 0; i < terminal->height; i++) {
                        memset(terminal_get_row(terminal, i),
                            0, terminal->data_pitch);
                        attr_init(terminal_get_attr_row(terminal, i),
                            terminal->curr_attr, terminal->width);
                  }
            }
            break;
      case 'K':    /* EL */
            row = terminal_get_row(terminal, terminal->row);
            attr_row = terminal_get_attr_row(terminal, terminal->row);
            if (!set[0] || args[0] == 0 || args[0] > 2) {
                  memset(&row[terminal->column], 0,
                      (terminal->width - terminal->column) * sizeof(union utf8_char));
                  attr_init(&attr_row[terminal->column], terminal->curr_attr,
                      terminal->width - terminal->column);
            } else if (args[0] == 1) {
                  memset(row, 0, (terminal->column+1) * sizeof(union utf8_char));
                  attr_init(attr_row, terminal->curr_attr, terminal->column+1);
            } else if (args[0] == 2) {
                  memset(row, 0, terminal->data_pitch);
                  attr_init(attr_row, terminal->curr_attr, terminal->width);
            }
            break;
      case 'L':    /* IL */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            if (terminal->row >= terminal->margin_top &&
                  terminal->row < terminal->margin_bottom)
            {
                  top = terminal->margin_top;
                  terminal->margin_top = terminal->row;
                  terminal_scroll(terminal, 0 - count);
                  terminal->margin_top = top;
            } else if (terminal->row == terminal->margin_bottom) {
                  memset(terminal_get_row(terminal, terminal->row),
                         0, terminal->data_pitch);
                  attr_init(terminal_get_attr_row(terminal, terminal->row),
                        terminal->curr_attr, terminal->width);
            }
            break;
      case 'M':    /* DL */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            if (terminal->row >= terminal->margin_top &&
                  terminal->row < terminal->margin_bottom)
            {
                  top = terminal->margin_top;
                  terminal->margin_top = terminal->row;
                  terminal_scroll(terminal, count);
                  terminal->margin_top = top;
            } else if (terminal->row == terminal->margin_bottom) {
                  memset(terminal_get_row(terminal, terminal->row),
                         0, terminal->data_pitch);
            }
            break;
      case 'P':    /* DCH */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            terminal_shift_line(terminal, 0 - count);
            break;
      case 'S':    /* SU */
            terminal_scroll(terminal, set[0] ? args[0] : 1);
            break;
      case 'T':    /* SD */
            terminal_scroll(terminal, 0 - (set[0] ? args[0] : 1));
            break;
      case 'X':    /* ECH */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            if ((terminal->column + count) > terminal->width)
                  count = terminal->width - terminal->column;
            row = terminal_get_row(terminal, terminal->row);
            attr_row = terminal_get_attr_row(terminal, terminal->row);
            memset(&row[terminal->column], 0, count * sizeof(union utf8_char));
            attr_init(&attr_row[terminal->column], terminal->curr_attr, count);
            break;
      case 'Z':    /* CBT */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            while (count > 0 && terminal->column >= 0) {
                  if (terminal->tab_ruler[terminal->column]) count--;
                  terminal->column--;
            }
            terminal->column++;
            break;
      case '`':    /* HPA */
            y = set[0] ? args[0] : 1;
            y = y <= 0 ? 1 : y > terminal->width ? terminal->width : y;
            
            terminal->column = y - 1;
            break;
      case 'b':    /* REP */
            count = set[0] ? args[0] : 1;
            if (count == 0) count = 1;
            if (terminal->last_char.byte[0])
                  for (i = 0; i < count; i++)
                        handle_char(terminal, terminal->last_char);
            terminal->last_char.byte[0] = 0;
            break;
      case 'c':    /* Primary DA */
            write(terminal->master, "\e[?6c", 5);
            break;
      case 'd':    /* VPA */
            x = set[0] ? args[0] : 1;
            x = x <= 0 ? 1 : x > terminal->height ? terminal->height : x;
            
            terminal->row = x - 1;
            break;
      case 'g':    /* TBC */
            if (!set[0] || args[0] == 0) {
                  terminal->tab_ruler[terminal->column] = 0;
            } else if (args[0] == 3) {
                  memset(terminal->tab_ruler, 0, terminal->width);
            }
            break;
      case 'h':    /* SM */
            for(i = 0; i < 10 && set[i]; i++) {
                  handle_term_parameter(terminal, args[i], 1);
            }
            break;
      case 'l':    /* RM */
            for(i = 0; i < 10 && set[i]; i++) {
                  handle_term_parameter(terminal, args[i], 0);
            }
            break;
      case 'm':    /* SGR */
            for(i = 0; i < 10; i++) {
                  if (i <= 7 && set[i] && set[i + 1] &&
                        set[i + 2] && args[i + 1] == 5)
                  {
                        if (args[i] == 38) {
                              handle_sgr(terminal, args[i + 2] + 256);
                              break;
                        } else if (args[i] == 48) {
                              handle_sgr(terminal, args[i + 2] + 512);
                              break;
                        }
                  }
                  if(set[i]) {
                        handle_sgr(terminal, args[i]);
                  } else if(i == 0) {
                        handle_sgr(terminal, 0);
                        break;
                  } else {
                        break;
                  }
            }
            break;
      case 'n':    /* DSR */
            i = set[0] ? args[0] : 0;
            if (i == 0 || i == 5) {
                  write(terminal->master, "\e[0n", 4);
            } else if (i == 6) {
                  snprintf(response, MAX_RESPONSE, "\e[%d;%dR",
                           terminal->origin_mode ?
                             terminal->row+terminal->margin_top : terminal->row+1,
                         terminal->column+1);
                  write(terminal->master, response, strlen(response));
            }
            break;
      case 'r':
            if(!set[0]) {
                  terminal->margin_top = 0;
                  terminal->margin_bottom = terminal->height-1;
                  terminal->row = 0;
                  terminal->column = 0;
            } else {
                  top = (set[0] ? args[0] : 1) - 1;
                  top = top < 0 ? 0 :
                        (top >= terminal->height ? terminal->height - 1 : top);
                  bottom = (set[1] ? args[1] : 1) - 1;
                  bottom = bottom < 0 ? 0 :
                           (bottom >= terminal->height ? terminal->height - 1 : bottom);
                  if(bottom > top) {
                        terminal->margin_top = top;
                        terminal->margin_bottom = bottom;
                  } else {
                        terminal->margin_top = 0;
                        terminal->margin_bottom = terminal->height-1;
                  }
                  if(terminal->origin_mode)
                        terminal->row = terminal->margin_top;
                  else
                        terminal->row = 0;
                  terminal->column = 0;
            }
            break;
      case 's':
            terminal->saved_row = terminal->row;
            terminal->saved_column = terminal->column;
            break;
      case 't':    /* windowOps */
            if (!set[0]) break;
            switch (args[0]) {
            case 4:  /* resize px */
                  if (set[1] && set[2]) {
                        window_set_child_size(terminal->window,
                                          args[2], args[1]);
                        resize_handler(terminal->window,
                                     args[2], args[1], terminal);
                  }
                  break;
            case 8:  /* resize ch */
                  if (set[1] && set[2]) {
                        terminal_resize(terminal, args[2], args[1]);
                  }
                  break;
            case 13: /* report position */
                  window_get_child_allocation(terminal->window, &allocation);
                  snprintf(response, MAX_RESPONSE, "\e[3;%d;%dt",
                         allocation.x, allocation.y);
                  write(terminal->master, response, strlen(response));
                  break;
            case 14: /* report px */
                  window_get_child_allocation(terminal->window, &allocation);
                  snprintf(response, MAX_RESPONSE, "\e[4;%d;%dt",
                         allocation.height, allocation.width);
                  write(terminal->master, response, strlen(response));
                  break;
            case 18: /* report ch */
                  snprintf(response, MAX_RESPONSE, "\e[9;%d;%dt",
                         terminal->height, terminal->width);
                  write(terminal->master, response, strlen(response));
                  break;
            case 21: /* report title */
                  snprintf(response, MAX_RESPONSE, "\e]l%s\e\\",
                         window_get_title(terminal->window));
                  write(terminal->master, response, strlen(response));
                  break;
            default:
                  if (args[0] >= 24)
                        terminal_resize(terminal, terminal->width, args[0]);
                  else
                        fprintf(stderr, "Unimplemented windowOp %d\n", args[0]);
                  break;
            }
      case 'u':
            terminal->row = terminal->saved_row;
            terminal->column = terminal->saved_column;
            break;
      default:
            fprintf(stderr, "Unknown CSI escape: %c\n", *p);
            break;
      }     
}

static void
handle_non_csi_escape(struct terminal *terminal, char code)
{
      switch(code) {
      case 'M':    /* RI */
            terminal->row -= 1;
            if(terminal->row < terminal->margin_top) {
                  terminal->row = terminal->margin_top;
                  terminal_scroll(terminal, -1);
            }
            break;
      case 'E':    /* NEL */
            terminal->column = 0;
            // fallthrough
      case 'D':    /* IND */
            terminal->row += 1;
            if(terminal->row > terminal->margin_bottom) {
                  terminal->row = terminal->margin_bottom;
                  terminal_scroll(terminal, +1);
            }
            break;
      case 'c':    /* RIS */
            terminal_init(terminal);
            break;
      case 'H':    /* HTS */
            terminal->tab_ruler[terminal->column] = 1;
            break;
      case '7':    /* DECSC */
            terminal->saved_row = terminal->row;
            terminal->saved_column = terminal->column;
            terminal->saved_attr = terminal->curr_attr;
            terminal->saved_origin_mode = terminal->origin_mode;
            terminal->saved_cs = terminal->cs;
            terminal->saved_g0 = terminal->g0;
            terminal->saved_g1 = terminal->g1;
            break;
      case '8':    /* DECRC */
            terminal->row = terminal->saved_row;
            terminal->column = terminal->saved_column;
            terminal->curr_attr = terminal->saved_attr;
            terminal->origin_mode = terminal->saved_origin_mode;
            terminal->cs = terminal->saved_cs;
            terminal->g0 = terminal->saved_g0;
            terminal->g1 = terminal->saved_g1;
            break;
      case '=':    /* DECPAM */
            terminal->key_mode = KM_APPLICATION;
            break;
      case '>':    /* DECPNM */
            terminal->key_mode = KM_NORMAL;
            break;
      default:
            fprintf(stderr, "Unknown escape code: %c\n", code);
            break;
      }
}

static void
handle_special_escape(struct terminal *terminal, char special, char code)
{
      int i, numChars;

      if (special == '#') {
            switch(code) {
            case '8':
                  /* fill with 'E', no cheap way to do this */
                  memset(terminal->data, 0, terminal->data_pitch * terminal->height);
                  numChars = terminal->width * terminal->height;
                  for(i = 0; i < numChars; i++) {
                        terminal->data[i].byte[0] = 'E';
                  }
                  break;
            default:
                  fprintf(stderr, "Unknown HASH escape #%c\n", code);
                  break;
            }
      } else if (special == '(' || special == ')') {
            switch(code) {
            case '0':
                  if (special == '(')
                        terminal->g0 = CS_SPECIAL;
                  else
                        terminal->g1 = CS_SPECIAL;
                  break;
            case 'A':
                  if (special == '(')
                        terminal->g0 = CS_UK;
                  else
                        terminal->g1 = CS_UK;
                  break;
            case 'B':
                  if (special == '(')
                        terminal->g0 = CS_US;
                  else
                        terminal->g1 = CS_US;
                  break;
            default:
                  fprintf(stderr, "Unknown character set %c\n", code);
                  break;
            }
      } else {
            fprintf(stderr, "Unknown special escape %c%c\n", special, code);
      }
}

static void
handle_sgr(struct terminal *terminal, int code)
{
      switch(code) {
      case 0:
            terminal->curr_attr = terminal->color_scheme->default_attr;
            break;
      case 1:
            terminal->curr_attr.a |= ATTRMASK_BOLD;
            if (terminal->curr_attr.fg < 8)
                  terminal->curr_attr.fg += 8;
            break;
      case 4:
            terminal->curr_attr.a |= ATTRMASK_UNDERLINE;
            break;
      case 5:
            terminal->curr_attr.a |= ATTRMASK_BLINK;
            break;
      case 8:
            terminal->curr_attr.a |= ATTRMASK_CONCEALED;
            break;
      case 2:
      case 21:
      case 22:
            terminal->curr_attr.a &= ~ATTRMASK_BOLD;
            if (terminal->curr_attr.fg < 16 && terminal->curr_attr.fg >= 8)
                  terminal->curr_attr.fg -= 8;
            break;
      case 24:
            terminal->curr_attr.a &= ~ATTRMASK_UNDERLINE;
            break;
      case 25:
            terminal->curr_attr.a &= ~ATTRMASK_BLINK;
            break;
      case 7:
      case 26:
            terminal->curr_attr.a |= ATTRMASK_INVERSE;
            break;
      case 27:
            terminal->curr_attr.a &= ~ATTRMASK_INVERSE;
            break;
      case 28:
            terminal->curr_attr.a &= ~ATTRMASK_CONCEALED;
            break;
      case 39:
            terminal->curr_attr.fg = terminal->color_scheme->default_attr.fg;
            break;
      case 49:
            terminal->curr_attr.bg = terminal->color_scheme->default_attr.bg;
            break;
      default:
            if(code >= 30 && code <= 37) {
                  terminal->curr_attr.fg = code - 30;
                  if (terminal->curr_attr.a & ATTRMASK_BOLD)
                        terminal->curr_attr.fg += 8;
            } else if(code >= 40 && code <= 47) {
                  terminal->curr_attr.bg = code - 40;
            } else if (code >= 90 && code <= 97) {
                  terminal->curr_attr.fg = code - 90 + 8;
            } else if (code >= 100 && code <= 107) {
                  terminal->curr_attr.bg = code - 100 + 8;
            } else if(code >= 256 && code < 512) {
                  terminal->curr_attr.fg = code - 256;
            } else if(code >= 512 && code < 768) {
                  terminal->curr_attr.bg = code - 512;
            } else {
                  fprintf(stderr, "Unknown SGR code: %d\n", code);
            }
            break;
      }
}

/* Returns 1 if c was special, otherwise 0 */
static int
handle_special_char(struct terminal *terminal, char c)
{
      union utf8_char *row;
      struct attr *attr_row;
      
      row = terminal_get_row(terminal, terminal->row);
      attr_row = terminal_get_attr_row(terminal, terminal->row);
      
      switch(c) {
      case '\r':
            terminal->column = 0;
            break;
      case '\n':
            if (terminal->mode & MODE_LF_NEWLINE) {
                  terminal->column = 0;
            }
            /* fallthrough */
      case '\v':
      case '\f':
            terminal->row++;
            if(terminal->row > terminal->margin_bottom) {
                  terminal->row = terminal->margin_bottom;
                  terminal_scroll(terminal, +1);
            }

            break;
      case '\t':
            while (terminal->column < terminal->width) {
                  if (terminal->tab_ruler[terminal->column]) break;
                  if (terminal->mode & MODE_IRM)
                        terminal_shift_line(terminal, +1);
                  row[terminal->column].byte[0] = ' ';
                  row[terminal->column].byte[1] = '\0';
                  attr_row[terminal->column] = terminal->curr_attr;
                  terminal->column++;
            }
            if (terminal->column >= terminal->width) {
                  terminal->column = terminal->width - 1;
            }

            break;
      case '\b':
            if (terminal->column >= terminal->width) {
                  terminal->column = terminal->width - 2;
            } else if (terminal->column > 0) {
                  terminal->column--;
            } else if (terminal->mode & MODE_AUTOWRAP) {
                  terminal->column = terminal->width - 1;
                  terminal->row -= 1;
                  if (terminal->row < terminal->margin_top) {
                        terminal->row = terminal->margin_top;
                        terminal_scroll(terminal, -1);
                  }
            }

            break;
      case '\a':
            /* Bell */
            break;
      case '\x0E': /* SO */
            terminal->cs = terminal->g1;
            break;
      case '\x0F': /* SI */
            terminal->cs = terminal->g0;
            break;
      default:
            return 0;
      }
      
      return 1;
}

static void
handle_char(struct terminal *terminal, union utf8_char utf8)
{
      union utf8_char *row;
      struct attr *attr_row;
      
      if (handle_special_char(terminal, utf8.byte[0])) return;

      apply_char_set(terminal->cs, &utf8);
      
      /* There are a whole lot of non-characters, control codes,
       * and formatting codes that should probably be ignored,
       * for example: */
      if (strncmp((char*) utf8.byte, "\xEF\xBB\xBF", 3) == 0) {
            /* BOM, ignore */
            return;
      } 
      
      /* Some of these non-characters should be translated, e.g.: */
      if (utf8.byte[0] < 32) {
            utf8.byte[0] = utf8.byte[0] + 64;
      }
      
      /* handle right margin effects */
      if (terminal->column >= terminal->width) {
            if (terminal->mode & MODE_AUTOWRAP) {
                  terminal->column = 0;
                  terminal->row += 1;
                  if (terminal->row > terminal->margin_bottom) {
                        terminal->row = terminal->margin_bottom;
                        terminal_scroll(terminal, +1);
                  }
            } else {
                  terminal->column--;
            }
      }
      
      row = terminal_get_row(terminal, terminal->row);
      attr_row = terminal_get_attr_row(terminal, terminal->row);
      
      if (terminal->mode & MODE_IRM)
            terminal_shift_line(terminal, +1);
      row[terminal->column] = utf8;
      attr_row[terminal->column++] = terminal->curr_attr;

      if (utf8.ch != terminal->last_char.ch)
            terminal->last_char = utf8;
}

static void
escape_append_utf8(struct terminal *terminal, union utf8_char utf8)
{
      int len, i;

      if ((utf8.byte[0] & 0x80) == 0x00)       len = 1;
      else if ((utf8.byte[0] & 0xE0) == 0xC0)  len = 2;
      else if ((utf8.byte[0] & 0xF0) == 0xE0)  len = 3;
      else if ((utf8.byte[0] & 0xF8) == 0xF0)  len = 4;
      else                                     len = 1;  /* Invalid, cannot happen */

      if (terminal->escape_length + len <= MAX_ESCAPE) {
            for (i = 0; i < len; i++)
                  terminal->escape[terminal->escape_length + i] = utf8.byte[i];
            terminal->escape_length += len;
      } else if (terminal->escape_length < MAX_ESCAPE) {
            terminal->escape[terminal->escape_length++] = 0;
      }
}

static void
terminal_data(struct terminal *terminal, const char *data, size_t length)
{
      int i;
      union utf8_char utf8;
      enum utf8_state parser_state;

      for (i = 0; i < length; i++) {
            parser_state =
                  utf8_next_char(&terminal->state_machine, data[i]);
            switch(parser_state) {
            case utf8state_accept:
                  utf8.ch = terminal->state_machine.s.ch;
                  break;
            case utf8state_reject:
                  /* the unicode replacement character */
                  utf8.byte[0] = 0xEF;
                  utf8.byte[1] = 0xBF;
                  utf8.byte[2] = 0xBD;
                  utf8.byte[3] = 0x00;
                  break;
            default:
                  continue;
            }

            /* assume escape codes never use non-ASCII characters */
            switch (terminal->state) {
            case escape_state_escape:
                  escape_append_utf8(terminal, utf8);
                  switch (utf8.byte[0]) {
                  case 'P':  /* DCS */
                        terminal->state = escape_state_dcs;
                        break;
                  case '[':  /* CSI */
                        terminal->state = escape_state_csi;
                        break;
                  case ']':  /* OSC */
                        terminal->state = escape_state_osc;
                        break;
                  case '#':
                  case '(':
                  case ')':  /* special */
                        terminal->state = escape_state_special;
                        break;
                  case '^':  /* PM (not implemented) */
                  case '_':  /* APC (not implemented) */
                        terminal->state = escape_state_ignore;
                        break;
                  default:
                        terminal->state = escape_state_normal;
                        handle_non_csi_escape(terminal, utf8.byte[0]);
                        break;
                  }
                  continue;
            case escape_state_csi:
                  if (handle_special_char(terminal, utf8.byte[0]) != 0) {
                        /* do nothing */
                  } else if (utf8.byte[0] == '?') {
                        terminal->escape_flags |= ESC_FLAG_WHAT;
                  } else if (utf8.byte[0] == '>') {
                        terminal->escape_flags |= ESC_FLAG_GT;
                  } else if (utf8.byte[0] == '!') {
                        terminal->escape_flags |= ESC_FLAG_BANG;
                  } else if (utf8.byte[0] == '$') {
                        terminal->escape_flags |= ESC_FLAG_CASH;
                  } else if (utf8.byte[0] == '\'') {
                        terminal->escape_flags |= ESC_FLAG_SQUOTE;
                  } else if (utf8.byte[0] == '"') {
                        terminal->escape_flags |= ESC_FLAG_DQUOTE;
                  } else if (utf8.byte[0] == ' ') {
                        terminal->escape_flags |= ESC_FLAG_SPACE;
                  } else {
                        escape_append_utf8(terminal, utf8);
                        if (terminal->escape_length >= MAX_ESCAPE)
                              terminal->state = escape_state_normal;
                  }
                  
                  if (isalpha(utf8.byte[0]) || utf8.byte[0] == '@' ||
                        utf8.byte[0] == '`')
                  {
                        terminal->state = escape_state_normal;
                        handle_escape(terminal);
                  } else {
                  }
                  continue;
            case escape_state_inner_escape:
                  if (utf8.byte[0] == '\\') {
                        terminal->state = escape_state_normal;
                        if (terminal->outer_state == escape_state_dcs) {
                              handle_dcs(terminal);
                        } else if (terminal->outer_state == escape_state_osc) {
                              handle_osc(terminal);
                        }
                  } else if (utf8.byte[0] == '\e') {
                        terminal->state = terminal->outer_state;
                        escape_append_utf8(terminal, utf8);
                        if (terminal->escape_length >= MAX_ESCAPE)
                              terminal->state = escape_state_normal;
                  } else {
                        terminal->state = terminal->outer_state;
                        if (terminal->escape_length < MAX_ESCAPE)
                              terminal->escape[terminal->escape_length++] = '\e';
                        escape_append_utf8(terminal, utf8);
                        if (terminal->escape_length >= MAX_ESCAPE)
                              terminal->state = escape_state_normal;
                  }
                  continue;
            case escape_state_dcs:
            case escape_state_osc:
            case escape_state_ignore:
                  if (utf8.byte[0] == '\e') {
                        terminal->outer_state = terminal->state;
                        terminal->state = escape_state_inner_escape;
                  } else if (utf8.byte[0] == '\a' && terminal->state == escape_state_osc) {
                        terminal->state = escape_state_normal;
                        handle_osc(terminal);
                  } else {
                        escape_append_utf8(terminal, utf8);
                        if (terminal->escape_length >= MAX_ESCAPE)
                              terminal->state = escape_state_normal;
                  }
                  continue;
            case escape_state_special:
                  escape_append_utf8(terminal, utf8);
                  terminal->state = escape_state_normal;
                  if (isdigit(utf8.byte[0]) || isalpha(utf8.byte[0])) {
                        handle_special_escape(terminal, terminal->escape[1],
                                              utf8.byte[0]);
                  }
                  continue;
            default:
                  break;
            }

            /* this is valid, because ASCII characters are never used to
             * introduce a multibyte sequence in UTF-8 */
            if (utf8.byte[0] == '\e') {
                  terminal->state = escape_state_escape;
                  terminal->outer_state = escape_state_normal;
                  terminal->escape[0] = '\e';
                  terminal->escape_length = 1;
                  terminal->escape_flags = 0;
            } else {
                  handle_char(terminal, utf8);
            } /* if */
      } /* for */

      window_schedule_redraw(terminal->window);
}

static void
selection_listener_send(void *data, struct wl_selection *selection,
                  const char *mime_type, int fd)
{
      struct terminal *terminal = data;

      fprintf(stderr, "selection send, fd is %d\n", fd);
      terminal_send_selection(terminal, fd);
      close(fd);
}

static void
selection_listener_cancelled(void *data, struct wl_selection *selection)
{
      fprintf(stderr, "selection cancelled\n");
      wl_selection_destroy(selection);
}

static const struct wl_selection_listener selection_listener = {
      selection_listener_send,
      selection_listener_cancelled
};

static int
handle_bound_key(struct terminal *terminal,
             struct input *input, uint32_t sym, uint32_t time)
{
      struct wl_shell *shell;

      switch (sym) {
      case XK_C:
            shell = display_get_shell(terminal->display);
            terminal->selection = wl_shell_create_selection(shell);
            wl_selection_add_listener(terminal->selection,
                                &selection_listener, terminal);
            wl_selection_offer(terminal->selection, "text/plain");
            wl_selection_activate(terminal->selection,
                              input_get_input_device(input), time);

            return 1;
      case XK_V:
            /* Just pass the master fd of the pty to receive the
             * selection. */
            if (input_offers_mime_type(input, "text/plain"))
                  input_receive_mime_type(input, "text/plain",
                                    terminal->master);
            return 1;
      case XK_X:
            /* cut selection; terminal doesn't do cut */
            return 0;
      default:
            return 0;
      }
}

static void
key_handler(struct window *window, struct input *input, uint32_t time,
          uint32_t key, uint32_t sym, uint32_t state, void *data)
{
      struct terminal *terminal = data;
      char ch[MAX_RESPONSE];
      uint32_t modifiers;
      int len = 0;

      modifiers = input_get_modifiers(input);
      if ((modifiers & XKB_COMMON_CONTROL_MASK) &&
          (modifiers & XKB_COMMON_SHIFT_MASK) &&
          state && handle_bound_key(terminal, input, sym, 0))
            return;

      switch (sym) {
      case XK_F11:
            if (!state)
                  break;
            terminal->fullscreen ^= 1;
            window_set_fullscreen(window, terminal->fullscreen);
            window_schedule_redraw(terminal->window);
            break;

      case XK_BackSpace:
      case XK_Tab:
      case XK_Linefeed:
      case XK_Clear:
      case XK_Pause:
      case XK_Scroll_Lock:
      case XK_Sys_Req:
      case XK_Escape:
            ch[len++] = sym & 0x7f;
            break;

      case XK_Return:
            if (terminal->mode & MODE_LF_NEWLINE) {
                  ch[len++] = 0x0D;
                  ch[len++] = 0x0A;
            } else {
                  ch[len++] = 0x0D;
            }
            break;

      case XK_Shift_L:
      case XK_Shift_R:
      case XK_Control_L:
      case XK_Control_R:
      case XK_Alt_L:
      case XK_Alt_R:
            break;

      case XK_Insert:
            len = function_key_response('[', 2, modifiers, '~', ch);
            break;
      case XK_Delete:
            if (terminal->mode & MODE_DELETE_SENDS_DEL) {
                  ch[len++] = '\x04';
            } else {
                  len = function_key_response('[', 3, modifiers, '~', ch);
            }
            break;
      case XK_Page_Up:
            len = function_key_response('[', 5, modifiers, '~', ch);
            break;
      case XK_Page_Down:
            len = function_key_response('[', 6, modifiers, '~', ch);
            break;
      case XK_F1:
            len = function_key_response('O', 1, modifiers, 'P', ch);
            break;
      case XK_F2:
            len = function_key_response('O', 1, modifiers, 'Q', ch);
            break;
      case XK_F3:
            len = function_key_response('O', 1, modifiers, 'R', ch);
            break;
      case XK_F4:
            len = function_key_response('O', 1, modifiers, 'S', ch);
            break;
      case XK_F5:
            len = function_key_response('[', 15, modifiers, '~', ch);
            break;
      case XK_F6:
            len = function_key_response('[', 17, modifiers, '~', ch);
            break;
      case XK_F7:
            len = function_key_response('[', 18, modifiers, '~', ch);
            break;
      case XK_F8:
            len = function_key_response('[', 19, modifiers, '~', ch);
            break;
      case XK_F9:
            len = function_key_response('[', 20, modifiers, '~', ch);
            break;
      case XK_F10:
            len = function_key_response('[', 21, modifiers, '~', ch);
            break;
      case XK_F12:
            len = function_key_response('[', 24, modifiers, '~', ch);
            break;
      default:
            /* Handle special keys with alternate mappings */
            len = apply_key_map(terminal->key_mode, sym, modifiers, ch);
            if (len != 0) break;
            
            if (modifiers & XKB_COMMON_CONTROL_MASK) {
                  if (sym >= '3' && sym <= '7')
                        sym = (sym & 0x1f) + 8;

                  if (!((sym >= '!' && sym <= '/') ||
                        (sym >= '8' && sym <= '?') ||
                        (sym >= '0' && sym <= '2'))) sym = sym & 0x1f;
                  else if (sym == '2') sym = 0x00;
                  else if (sym == '/') sym = 0x1F;
                  else if (sym == '8' || sym == '?') sym = 0x7F;
            } else if ((terminal->mode & MODE_ALT_SENDS_ESC) && 
                     (modifiers & XKB_COMMON_MOD1_MASK))
            {
                  ch[len++] = 0x1b;
            } else if (modifiers & XKB_COMMON_MOD1_MASK) {
                  sym = sym | 0x80;
            }

            if (sym < 256)
                  ch[len++] = sym;
            break;
      }

      if (state && len > 0)
            write(terminal->master, ch, len);
}

static void
keyboard_focus_handler(struct window *window,
                   struct input *device, void *data)
{
      struct terminal *terminal = data;

      terminal->focused = (device != NULL);
      window_schedule_redraw(terminal->window);
}

static void
button_handler(struct window *window,
             struct input *input, uint32_t time,
             int button, int state, void *data)
{
      struct terminal *terminal = data;

      switch (button) {
      case 272:
            if (state) {
                  terminal->dragging = 1;
                  terminal->selection_active = 0;
                  input_get_position(input,
                                 &terminal->selection_start_x,
                                 &terminal->selection_start_y);
                  terminal->selection_end_x = terminal->selection_start_x;
                  terminal->selection_end_y = terminal->selection_start_y;
                  window_schedule_redraw(window);
            } else {
                  terminal->dragging = 0;
            }
            break;
      }
}

static int
motion_handler(struct window *window,
             struct input *input, uint32_t time,
             int32_t x, int32_t y,
             int32_t sx, int32_t sy, void *data)
{
      struct terminal *terminal = data;

      if (terminal->dragging) {
            terminal->selection_active = 1;
            input_get_position(input,
                           &terminal->selection_end_x,
                           &terminal->selection_end_y);
            window_schedule_redraw(window);
      }

      return POINTER_IBEAM;
}

static struct terminal *
terminal_create(struct display *display, int fullscreen)
{
      struct terminal *terminal;
      cairo_surface_t *surface;
      cairo_t *cr;

      terminal = malloc(sizeof *terminal);
      if (terminal == NULL)
            return terminal;

      memset(terminal, 0, sizeof *terminal);
      terminal->fullscreen = fullscreen;
      terminal->color_scheme = &DEFAULT_COLORS;
      terminal_init(terminal);
      terminal->margin_top = 0;
      terminal->margin_bottom = -1;
      terminal->window = window_create(display, 500, 400);
      window_set_title(terminal->window, "Wayland Terminal");

      init_state_machine(&terminal->state_machine);
      init_color_table(terminal);

      terminal->display = display;
      terminal->margin = 5;

      window_set_user_data(terminal->window, terminal);
      window_set_redraw_handler(terminal->window, redraw_handler);
      window_set_resize_handler(terminal->window, resize_handler);

      window_set_key_handler(terminal->window, key_handler);
      window_set_keyboard_focus_handler(terminal->window,
                                keyboard_focus_handler);
      window_set_button_handler(terminal->window, button_handler);
      window_set_motion_handler(terminal->window, motion_handler);

      surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 0, 0);
      cr = cairo_create(surface);
      cairo_set_font_size(cr, 14);
      cairo_select_font_face (cr, "mono",
                        CAIRO_FONT_SLANT_NORMAL,
                        CAIRO_FONT_WEIGHT_BOLD);
      terminal->font_bold = cairo_get_scaled_font (cr);
      cairo_scaled_font_reference(terminal->font_bold);

      cairo_select_font_face (cr, "mono",
                        CAIRO_FONT_SLANT_NORMAL,
                        CAIRO_FONT_WEIGHT_NORMAL);
      terminal->font_normal = cairo_get_scaled_font (cr);
      cairo_scaled_font_reference(terminal->font_normal);

      cairo_font_extents(cr, &terminal->extents);
      cairo_destroy(cr);
      cairo_surface_destroy(surface);

      return terminal;
}

static gboolean
io_handler(GIOChannel   *source,
         GIOCondition  condition,
         gpointer      data)
{
      struct terminal *terminal = data;
      gchar buffer[256];
      gsize bytes_read;
      GError *error = NULL;

      if(condition == G_IO_HUP)
          exit(0);

      g_io_channel_read_chars(source, buffer, sizeof buffer,
                        &bytes_read, &error);

      terminal_data(terminal, buffer, bytes_read);

      return TRUE;
}

static int
terminal_run(struct terminal *terminal, const char *path)
{
      int master;
      pid_t pid;

      pid = forkpty(&master, NULL, NULL, NULL);
      if (pid == 0) {
            setenv("TERM", "xterm-256color", 1);
            setenv("COLORTERM", "xterm-256color", 1);
            if (execl(path, path, NULL)) {
                  printf("exec failed: %m\n");
                  exit(EXIT_FAILURE);
            }
      } else if (pid < 0) {
            fprintf(stderr, "failed to fork and create pty (%m).\n");
            return -1;
      }

      terminal->master = master;
      terminal->channel = g_io_channel_unix_new(master);
      fcntl(master, F_SETFL, O_NONBLOCK);
      g_io_add_watch(terminal->channel, G_IO_IN, io_handler, terminal);
        g_io_add_watch(terminal->channel, G_IO_HUP, io_handler, terminal);

      terminal_resize(terminal, 80, 24);
      terminal_draw(terminal);

      return 0;
}

static const GOptionEntry option_entries[] = {
      { "fullscreen", 'f', 0, G_OPTION_ARG_NONE,
        &option_fullscreen, "Run in fullscreen mode" },
      { NULL }
};

int main(int argc, char *argv[])
{
      struct display *d;
      struct terminal *terminal;

      d = display_create(&argc, &argv, option_entries, NULL);
      if (d == NULL) {
            fprintf(stderr, "failed to create display: %m\n");
            return -1;
      }

      terminal = terminal_create(d, option_fullscreen);
      if (terminal_run(terminal, "/bin/bash"))
            exit(EXIT_FAILURE);

      display_run(d);

      return 0;
}

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