fix debug messages

[spiceterm.git] / spiceterm.c

/*

     Copyright (C) 2013 Proxmox Server Solutions GmbH

     Copyright: spiceterm is under GNU GPL, the GNU General Public License.

     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; version 2 dated June, 1991.

     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
     02111-1307, USA.

     Author: Dietmar Maurer <dietmar@proxmox.com>

     Note: most of the code here is copied from vncterm (which is
     also written by me).

*/

#define _GNU_SOURCE

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <pty.h>  /* for openpty and forkpty */
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <signal.h>
#include <locale.h>

#include "spiceterm.h"

#include <glib.h>
#include <spice.h>
#include <spice/enums.h>
#include <spice/macros.h>
#include <spice/qxl_dev.h>

#include <gdk/gdkkeysyms.h>

#include "event_loop.h"
#include "translations.h"

static int debug = 0;

#define DPRINTF(x, format, ...) { \
    if (x <= debug) { \
        printf("%s: " format "\n" , __FUNCTION__, ## __VA_ARGS__); \
    } \
}

#define TERM "xterm"

#define TERMIDCODE "[?1;2c" // vt100 ID

#define CHECK_ARGC(argc,argv,i) if (i >= argc-1) { \
   fprintf(stderr, "ERROR: not enough arguments for: %s\n", argv[i]); \
   print_usage(NULL); \
   exit(1); \
}

/* these colours are from linux kernel drivers/char/vt.c */

unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
				8,12,10,14, 9,13,11,15 };


static void
print_usage(const char *msg)
{
    if (msg) { fprintf(stderr, "ERROR: %s\n", msg); }
    fprintf(stderr, "USAGE: spiceterm [spiceopts] [-c command [args]]\n");
}

/* Convert UCS2 to UTF8 sequence, trailing zero */
/*
static int
ucs2_to_utf8 (gunichar2 c, char *out)
{
  if (c < 0x80) {
    out[0] = c;			//  0*******
    out[1] = 0;
    return 1;
  } else if (c < 0x800) {
    out[0] = 0xc0 | (c >> 6); 	//  110***** 10******
    out[1] = 0x80 | (c & 0x3f);
    out[2] = 0;
    return 2;
  } else {
    out[0] = 0xe0 | (c >> 12); 	//  1110**** 10****** 10******
    out[1] = 0x80 | ((c >> 6) & 0x3f);
    out[2] = 0x80 | (c & 0x3f);
    out[3] = 0;
    return 3;
  }

  return 0;
}
*/

static void
draw_char_at (spiceTerm *vt, int x, int y, gunichar2 ch, TextAttributes attrib)
{
    if (x < 0 || y < 0 || x >= vt->width || y >= vt->height) {
        return;
    }

    spice_screen_draw_char(vt->screen, x, y, ch, attrib);
}

static void
spiceterm_update_xy (spiceTerm *vt, int x, int y)
{
    if (x < 0 || y < 0 || x >= vt->width || y >= vt->height) { return; }

    int y1 = (vt->y_base + y) % vt->total_height;
    int y2 = y1 - vt->y_displ;
    if (y2 < 0) {
        y2 += vt->total_height;
    }
    if (y2 < vt->height) {
        TextCell *c = &vt->cells[y1 * vt->width + x];
        draw_char_at (vt, x, y2, c->ch, c->attrib);
    }
}

static void
spiceterm_clear_xy (spiceTerm *vt, int x, int y)
{
    if (x < 0 || y < 0 || x >= vt->width || y >= vt->height) { return; }

    int y1 = (vt->y_base + y) % vt->total_height;
    int y2 = y1 - vt->y_displ;
    if (y2 < 0) {
        y2 += vt->total_height;
    }
    if (y2 < vt->height) {
        TextCell *c = &vt->cells[y1 * vt->width + x];
        c->ch = ' ';
        c->attrib = vt->default_attrib;
        c->attrib.fgcol = vt->cur_attrib.fgcol;
        c->attrib.bgcol = vt->cur_attrib.bgcol;

        draw_char_at (vt, x, y, c->ch, c->attrib);
    }
}

static void
spiceterm_show_cursor (spiceTerm *vt, int show)
{
    int x = vt->cx;
    if (x >= vt->width) {
        x = vt->width - 1;
    }

    int y1 = (vt->y_base + vt->cy) % vt->total_height;
    int y = y1 - vt->y_displ;
    if (y < 0) {
        y += vt->total_height;
    }

    if (y < vt->height) {

        TextCell *c = &vt->cells[y1 * vt->width + x];

        if (show) {
            TextAttributes attrib = vt->default_attrib;
            attrib.invers = !(attrib.invers); /* invert fg and bg */
            draw_char_at (vt, x, y, c->ch, attrib);
        } else {
            draw_char_at (vt, x, y, c->ch, c->attrib);
        }
    }
}

static void
spiceterm_refresh (spiceTerm *vt)
{
    int x, y, y1;

    y1 = vt->y_displ;
    for(y = 0; y < vt->height; y++) {
        TextCell *c = vt->cells + y1 * vt->width;
        for(x = 0; x < vt->width; x++) {
            draw_char_at (vt, x, y, c->ch, c->attrib);
            c++;
        }
        if (++y1 == vt->total_height)
            y1 = 0;
    }

    spiceterm_show_cursor (vt, 1);
}

static void
spiceterm_scroll_down (spiceTerm *vt, int top, int bottom, int lines)
{
    if ((top + lines) >= bottom) {
        lines = bottom - top -1;
    }

    if (top < 0 || bottom > vt->height || top >= bottom || lines < 1) {
        return;
    }

    int i;
    for(i = bottom - top - lines - 1; i >= 0; i--) {
        int src = ((vt->y_base + top + i) % vt->total_height)*vt->width;
        int dst = ((vt->y_base + top + lines + i) % vt->total_height)*vt->width;

        memmove(vt->cells + dst, vt->cells + src, vt->width*sizeof (TextCell));
    }

    for (i = 0; i < lines; i++) {
        int j;
        TextCell *c = vt->cells + ((vt->y_base + top + i) % vt->total_height)*vt->width;
        for(j = 0; j < vt->width; j++) {
            c->attrib = vt->default_attrib;
            c->ch = ' ';
            c++;
        }
    }

    int h = lines * 16;
    int y0 = top*16;
    int y1 = y0 + h;
    int y2 = bottom*16;

    spice_screen_scroll(vt->screen, 0, y1, vt->screen->primary_width, y2, 0, y0);
    spice_screen_clear(vt->screen, 0, y0, vt->screen->primary_width, y1);
}

static void
spiceterm_scroll_up (spiceTerm *vt, int top, int bottom, int lines, int moveattr)
{
    if ((top + lines) >= bottom) {
        lines = bottom - top - 1;
    }

    if (top < 0 || bottom > vt->height || top >= bottom || lines < 1) {
        return;
    }


    int h = lines * 16;
    int y0 = top*16;
    int y1 = (top + lines)*16;
    int y2 = bottom*16;

    spice_screen_scroll(vt->screen, 0, y0, vt->screen->primary_width, y2 -h, 0, y1);
    spice_screen_clear(vt->screen, 0, y2 -h, vt->screen->primary_width, y2);

    if (!moveattr) {
        return;
    }

    // move attributes

    int i;
    for(i = 0; i < (bottom - top - lines); i++) {
        int dst = ((vt->y_base + top + i) % vt->total_height)*vt->width;
        int src = ((vt->y_base + top + lines + i) % vt->total_height)*vt->width;

        memmove(vt->cells + dst, vt->cells + src, vt->width*sizeof (TextCell));
    }

    for (i = 1; i <= lines; i++) {
        int j;
        TextCell *c = vt->cells + ((vt->y_base + bottom - i) % vt->total_height)*vt->width;
        for(j = 0; j < vt->width; j++) {
            c->attrib = vt->default_attrib;
            c->ch = ' ';
            c++;
        }
    }
}

static void
spiceterm_virtual_scroll (spiceTerm *vt, int lines)
{
    if (vt->altbuf || lines == 0) return;

    if (lines < 0) {
        lines = -lines;
        int i = vt->scroll_height;
        if (i > vt->total_height - vt->height)
            i = vt->total_height - vt->height;
        int y1 = vt->y_base - i;
        if (y1 < 0)
            y1 += vt->total_height;
        for(i = 0; i < lines; i++) {
            if (vt->y_displ == y1) break;
            if (--vt->y_displ < 0) {
                vt->y_displ = vt->total_height - 1;
            }
        }
    } else {
        int i;
        for(i = 0; i < lines; i++) {
            if (vt->y_displ == vt->y_base) break;
            if (++vt->y_displ == vt->total_height) {
                vt->y_displ = 0;
            }
        }
    }

    spiceterm_refresh (vt);
}

static void
spiceterm_respond_esc (spiceTerm *vt, const char *esc)
{
    int len = strlen (esc);
    int i;

    if (vt->ibuf_count < (IBUFSIZE - 1 - len)) {
        vt->ibuf[vt->ibuf_count++] = 27;
        for (i = 0; i < len; i++) {
            vt->ibuf[vt->ibuf_count++] = esc[i];
        }
    }
}

static void
spiceterm_put_lf (spiceTerm *vt)
{
    if (vt->cy + 1 == vt->region_bottom) {

        if (vt->altbuf || vt->region_top != 0 || vt->region_bottom != vt->height) {
            spiceterm_scroll_up (vt, vt->region_top, vt->region_bottom, 1, 1);
            return;
        }

        if (vt->y_displ == vt->y_base) {
            spiceterm_scroll_up (vt, vt->region_top, vt->region_bottom, 1, 0);
        }

        if (vt->y_displ == vt->y_base) {
            if (++vt->y_displ == vt->total_height) {
                vt->y_displ = 0;
            }
        }

        if (++vt->y_base == vt->total_height) {
            vt->y_base = 0;
        }

        if (vt->scroll_height < vt->total_height) {
            vt->scroll_height++;
        }

        int y1 = (vt->y_base + vt->height - 1) % vt->total_height;
        TextCell *c = &vt->cells[y1 * vt->width];
        int x;
        for (x = 0; x < vt->width; x++) {
            c->ch = ' ';
            c->attrib = vt->default_attrib;
            c++;
        }

        // fprintf (stderr, "BASE: %d DISPLAY %d\n", vt->y_base, vt->y_displ);

    } else if (vt->cy < vt->height - 1) {
        vt->cy += 1;
    }
}

static void
spiceterm_csi_m (spiceTerm *vt)
{
    int i;

    for (i = 0; i < vt->esc_count; i++) {
        switch (vt->esc_buf[i]) {
        case 0: /* reset all console attributes to default */
            vt->cur_attrib = vt->default_attrib;
            break;
        case 1:
            vt->cur_attrib.bold = 1;
            break;
        case 4:
            vt->cur_attrib.uline = 1;
            break;
        case 5:
            vt->cur_attrib.blink = 1;
            break;
        case 7:
            vt->cur_attrib.invers = 1;
            break;
        case 8:
            vt->cur_attrib.unvisible = 1;
            break;
        case 10:
            vt->cur_enc = LAT1_MAP;
            // fixme: dispaly controls = 0 ?
            // fixme: toggle meta = 0 ?
            break;
        case 11:
            vt->cur_enc = IBMPC_MAP;
            // fixme: dispaly controls = 1 ?
            // fixme: toggle meta = 0 ?
            break;
        case 12:
            vt->cur_enc = IBMPC_MAP;
            // fixme: dispaly controls = 1 ?
            // fixme: toggle meta = 1 ?
            break;
        case 22:
            vt->cur_attrib.bold = 0;
            break;
        case 24:
            vt->cur_attrib.uline = 0;
            break;
        case 25:
            vt->cur_attrib.blink = 0;
            break;
        case 27:
            vt->cur_attrib.invers = 0;
            break;
        case 28:
            vt->cur_attrib.unvisible = 0;
            break;
        case 30:
        case 31:
        case 32:
        case 33:
        case 34:
        case 35:
        case 36:
        case 37:
            /* set foreground color */
            vt->cur_attrib.fgcol = color_table [vt->esc_buf[i] - 30];
            break;
        case 38:
            /* reset color to default, enable underline */
            vt->cur_attrib.fgcol = vt->default_attrib.fgcol;
            vt->cur_attrib.uline = 1;
            break;
        case 39:
            /* reset color to default, disable underline */
            vt->cur_attrib.fgcol = vt->default_attrib.fgcol;
            vt->cur_attrib.uline = 0;
            break;
        case 40:
        case 41:
        case 42:
        case 43:
        case 44:
        case 45:
        case 46:
        case 47:
            /* set background color */
            vt->cur_attrib.bgcol = color_table [vt->esc_buf[i] - 40];
            break;
        case 49:
            /* reset background color */
            vt->cur_attrib.bgcol = vt->default_attrib.bgcol;
            break;
        default:
            fprintf(stderr, "unhandled ESC[%d m code\n",vt->esc_buf[i]);
            //fixme: implement
        }
    }
}

static void
spiceterm_save_cursor (spiceTerm *vt)
{
    vt->cx_saved = vt->cx;
    vt->cy_saved = vt->cy;
    vt->cur_attrib_saved = vt->cur_attrib;
    vt->charset_saved = vt->charset;
    vt->g0enc_saved = vt->g0enc;
    vt->g1enc_saved = vt->g1enc;
    vt->cur_enc_saved = vt->cur_enc;
}

static void
spiceterm_restore_cursor (spiceTerm *vt)
{
    vt->cx = vt->cx_saved;
    vt->cy = vt->cy_saved;
    vt->cur_attrib = vt->cur_attrib_saved;
    vt->charset = vt->charset_saved;
    vt->g0enc = vt->g0enc_saved;
    vt->g1enc = vt->g1enc_saved;
    vt->cur_enc = vt->cur_enc_saved;
}

static void
spiceterm_set_alternate_buffer (spiceTerm *vt, int on_off)
{
    int x, y;

    vt->y_displ = vt->y_base;

    if (on_off) {

        if (vt->altbuf) return;

        vt->altbuf = 1;

        /* alternate buffer & cursor */

        spiceterm_save_cursor (vt);
        /* save screen to altcels */
        for (y = 0; y < vt->height; y++) {
            int y1 = (vt->y_base + y) % vt->total_height;
            for (x = 0; x < vt->width; x++) {
                vt->altcells[y*vt->width + x] = vt->cells[y1*vt->width + x];
            }
        }

        /* clear screen */
        for (y = 0; y <= vt->height; y++) {
            for (x = 0; x < vt->width; x++) {
                spiceterm_clear_xy (vt, x, y);
            }
        }

    } else {

        if (vt->altbuf == 0) return;

        vt->altbuf = 0;

        /* restore saved data */
        for (y = 0; y < vt->height; y++) {
            int y1 = (vt->y_base + y) % vt->total_height;
            for (x = 0; x < vt->width; x++) {
                vt->cells[y1*vt->width + x] = vt->altcells[y*vt->width + x];
            }
        }

        spiceterm_restore_cursor (vt);
    }

    spiceterm_refresh (vt);
}

static void
spiceterm_set_mode (spiceTerm *vt, int on_off)
{
    int i;

    for (i = 0; i <= vt->esc_count; i++) {
        if (vt->esc_ques) {          /* DEC private modes set/reset */
            switch(vt->esc_buf[i]) {
            case 10:                   /* X11 mouse reporting on/off */
            case 1000:
                vt->report_mouse = on_off;
                break;
            case 1049:	 	/* start/end special app mode (smcup/rmcup) */
                spiceterm_set_alternate_buffer (vt, on_off);
                break;
            case 25:	 	        /* Cursor on/off */
            case 9:                   /* X10 mouse reporting on/off */
            case 6:			/* Origin relative/absolute */
            case 1:			/* Cursor keys in appl mode*/
            case 5:			/* Inverted screen on/off */
            case 7:			/* Autowrap on/off */
            case 8:			/* Autorepeat on/off */
                break;
            }
        } else { /* ANSI modes set/reset */
            /* fixme: implement me */
        }
    }
}

static void
spiceterm_gotoxy (spiceTerm *vt, int x, int y)
{
    /* verify all boundaries */

    if (x < 0) {
        x = 0;
    }

    if (x >= vt->width) {
        x = vt->width - 1;
    }

    vt->cx = x;

    if (y < 0) {
        y = 0;
    }

    if (y >= vt->height) {
        y = vt->height - 1;
    }

    vt->cy = y;
}

static void 
debug_print_escape_buffer(spiceTerm *vt, const char *func, const char *prefix,
                          const char *qes, gunichar2 ch)
{
    if (debug >=1 ) {
        if (vt->esc_count == 0) {
            printf("%s:%s ESC[%s%c\n", func, prefix, qes, ch);
        } else if (vt->esc_count == 1) {
            printf("%s:%s ESC[%s%d%c\n", func, prefix, qes, vt->esc_buf[0], ch);
        } else {
            int i;
            printf("%s:%s ESC[%s%d", func, prefix, qes, vt->esc_buf[0]);
            for (i = 1; i < vt->esc_count; i++) {
                printf(";%d",  vt->esc_buf[i]);
            }
            printf("%c\n", ch);
        }
    }
}

enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
       EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
       ESpalette, ESidquery, ESosc1, ESosc2};

static void
spiceterm_putchar (spiceTerm *vt, gunichar2 ch)
{
    int x, y, i, c;

    if (debug && !vt->tty_state) {
        DPRINTF(1, "CHAR:%2d: %4x '%c' (cur_enc %d) %d %d",
                vt->tty_state, ch, ch, vt->cur_enc, vt->cx, vt->cy);
    }

    switch(vt->tty_state) {
    case ESesc:
        vt->tty_state = ESnormal;
        switch (ch) {
        case '[':
            vt->tty_state = ESsquare;
            break;
        case ']':
            vt->tty_state = ESnonstd;
            break;
        case '%':
            vt->tty_state = ESpercent;
            break;
        case '7':
            spiceterm_save_cursor (vt);
            break;
        case '8':
            spiceterm_restore_cursor (vt);
            break;
        case '(':
            vt->tty_state = ESsetG0; // SET G0
            break;
        case ')':
            vt->tty_state = ESsetG1; // SET G1
            break;
        case 'M':
            /* cursor up (ri) */
            if (vt->cy == vt->region_top)
                spiceterm_scroll_down (vt, vt->region_top, vt->region_bottom, 1);
            else if (vt->cy > 0) {
                vt->cy--;
            }
            break;
        case '>':
            /* numeric keypad  - ignored */
            break;
        case '=':
            /* appl. keypad - ignored */
            break;
        default:
            DPRINTF(1, "got unhandled ESC%c  %d", ch, ch);
            break;
        }
        break;
    case ESnonstd: /* Operating System Controls */
        vt->tty_state = ESnormal;

        switch (ch) {
        case 'P':   /* palette escape sequence */
            for(i = 0; i < MAX_ESC_PARAMS; i++) {
                vt->esc_buf[i] = 0;
            }

            vt->esc_count = 0;
            vt->tty_state = ESpalette;
            break;
        case 'R':   /* reset palette */
            // fixme: reset_palette(vc);
            break;
        case '0':
        case '1':
        case '2':
        case '4':
            vt->osc_cmd = ch;
            vt->osc_textbuf[0] = 0;
            vt->tty_state = ESosc1;
            break;
        default:
            DPRINTF(1, "got unhandled OSC %c", ch);
            vt->tty_state = ESnormal;
            break;
        }
        break;
    case ESosc1:
        vt->tty_state = ESnormal;
        if (ch == ';') {
            vt->tty_state = ESosc2;
        } else {
            DPRINTF(1, "got illegal OSC sequence");
        }
        break;
    case ESosc2:
        if (ch != 0x9c && ch != 7) {
            int i = 0;
            while (vt->osc_textbuf[i]) i++;
            vt->osc_textbuf[i++] = ch;
            vt->osc_textbuf[i] = 0;
        } else {
            DPRINTF(1, "OSC:%c:%s", vt->osc_cmd, vt->osc_textbuf);
            vt->tty_state = ESnormal;
        }
        break;
    case ESpalette:
        if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'F')
            || (ch >= 'a' && ch <= 'f')) {
            vt->esc_buf[vt->esc_count++] = (ch > '9' ? (ch & 0xDF) - 'A' + 10 : ch - '0');
            if (vt->esc_count == 7) {
                // fixme: this does not work - please test
                /*
                  rfbColourMap *cmap =&vt->screen->colourMap;

                  int i = color_table[vt->esc_buf[0]] * 3, j = 1;
                  cmap->data.bytes[i] = 16 * vt->esc_buf[j++];
                  cmap->data.bytes[i++] += vt->esc_buf[j++];
                  cmap->data.bytes[i] = 16 * vt->esc_buf[j++];
                  cmap->data.bytes[i++] += vt->esc_buf[j++];
                  cmap->data.bytes[i] = 16 * vt->esc_buf[j++];
                  cmap->data.bytes[i] += vt->esc_buf[j];
                */
                //set_palette(vc); ?

                vt->tty_state = ESnormal;
            }
        } else
            vt->tty_state = ESnormal;
        break;
    case ESsquare:
        for(i = 0; i < MAX_ESC_PARAMS; i++) {
            vt->esc_buf[i] = 0;
        }

        vt->esc_count = 0;
        vt->esc_has_par = 0;
        vt->tty_state = ESgetpars;

        if (ch == '>') {
            vt->tty_state = ESidquery;
            break;
        }

        if ((vt->esc_ques = (ch == '?'))) {
            break;
        }
    case ESgetpars:
        if (ch >= '0' && ch <= '9') {
            vt->esc_has_par = 1;
            if (vt->esc_count < MAX_ESC_PARAMS) {
                vt->esc_buf[vt->esc_count] = vt->esc_buf[vt->esc_count] * 10 + ch - '0';
            }
            break;
        } else if (ch == ';') {
            vt->esc_count++;
            break;
        } else {
            if (vt->esc_has_par) {
                vt->esc_count++;
            }
            vt->tty_state = ESgotpars;
        }
    case ESgotpars:

        vt->tty_state = ESnormal;

        char *qes = vt->esc_ques ? "?" : "";

        if (debug) {
            debug_print_escape_buffer(vt, __func__, "", qes, ch);
        }

        switch (ch) {
        case 'h':
            spiceterm_set_mode (vt, 1);
            break;
        case 'l':
            spiceterm_set_mode (vt, 0);
            break;
        case 'm':
            if (!vt->esc_count) {
                vt->esc_count++; // default parameter 0
            }
            spiceterm_csi_m (vt);
            break;
        case 'n':
            /* report cursor position */
            /* TODO: send ESC[row;colR */
            break;
        case 'A':
            /* move cursor up */
            if (vt->esc_buf[0] == 0) {
                vt->esc_buf[0] = 1;
            }
            vt->cy -= vt->esc_buf[0];
            if (vt->cy < 0) {
                vt->cy = 0;
            }
            break;
        case 'B':
        case 'e':
            /* move cursor down */
            if (vt->esc_buf[0] == 0) {
                vt->esc_buf[0] = 1;
            }
            vt->cy += vt->esc_buf[0];
            if (vt->cy >= vt->height) {
                vt->cy = vt->height - 1;
            }
            break;
        case 'C':
        case 'a':
            /* move cursor right */
            if (vt->esc_buf[0] == 0) {
                vt->esc_buf[0] = 1;
            }
            vt->cx += vt->esc_buf[0];
            if (vt->cx >= vt->width) {
                vt->cx = vt->width - 1;
            }
            break;
        case 'D':
            /* move cursor left */
            if (vt->esc_buf[0] == 0) {
                vt->esc_buf[0] = 1;
            }
            vt->cx -= vt->esc_buf[0];
            if (vt->cx < 0) {
                vt->cx = 0;
            }
            break;
        case 'G':
        case '`':
            /* move cursor to column */
            spiceterm_gotoxy (vt, vt->esc_buf[0] - 1, vt->cy);
            break;
        case 'd':
            /* move cursor to row */
            spiceterm_gotoxy (vt, vt->cx , vt->esc_buf[0] - 1);
            break;
        case 'f':
        case 'H':
            /* move cursor to row, column */
            spiceterm_gotoxy (vt, vt->esc_buf[1] - 1,  vt->esc_buf[0] - 1);
            break;
        case 'J':
            switch (vt->esc_buf[0]) {
            case 0:
                /* clear to end of screen */
                for (y = vt->cy; y < vt->height; y++) {
                    for (x = 0; x < vt->width; x++) {
                        if (y == vt->cy && x < vt->cx) {
                            continue;
                        }
                        spiceterm_clear_xy (vt, x, y);
                    }
                }
                break;
            case 1:
                /* clear from beginning of screen */
                for (y = 0; y <= vt->cy; y++) {
                    for (x = 0; x < vt->width; x++) {
                        if (y == vt->cy && x > vt->cx) {
                            break;
                        }
                        spiceterm_clear_xy (vt, x, y);
                    }
                }
                break;
            case 2:
                /* clear entire screen */
                for (y = 0; y <= vt->height; y++) {
                    for (x = 0; x < vt->width; x++) {
                        spiceterm_clear_xy (vt, x, y);
                    }
                }
                break;
            }
            break;
        case 'K':
            switch (vt->esc_buf[0]) {
            case 0:
                /* clear to eol */
                for(x = vt->cx; x < vt->width; x++) {
                    spiceterm_clear_xy (vt, x, vt->cy);
                }
                break;
            case 1:
                /* clear from beginning of line */
                for (x = 0; x <= vt->cx; x++) {
                    spiceterm_clear_xy (vt, x, vt->cy);
                }
                break;
            case 2:
                /* clear entire line */
                for(x = 0; x < vt->width; x++) {
                    spiceterm_clear_xy (vt, x, vt->cy);
                }
                break;
            }
            break;
        case 'L':
            /* insert line */
            c = vt->esc_buf[0];

            if (c > vt->height - vt->cy)
                c = vt->height - vt->cy;
            else if (!c)
                c = 1;

            spiceterm_scroll_down (vt, vt->cy, vt->region_bottom, c);
            break;
        case 'M':
            /* delete line */
            c = vt->esc_buf[0];

            if (c > vt->height - vt->cy)
                c = vt->height - vt->cy;
            else if (!c)
                c = 1;

            spiceterm_scroll_up (vt, vt->cy, vt->region_bottom, c, 1);
            break;
        case 'T':
            /* scroll down */
            c = vt->esc_buf[0];
            if (!c) c = 1;
            spiceterm_scroll_down (vt, vt->region_top, vt->region_bottom, c);
            break;
        case 'S':
            /* scroll up */
            c = vt->esc_buf[0];
            if (!c) c = 1;
            spiceterm_scroll_up (vt, vt->region_top, vt->region_bottom, c, 1);
            break;
        case 'P':
            /* delete c character */
            c = vt->esc_buf[0];

            if (c > vt->width - vt->cx)
                c = vt->width - vt->cx;
            else if (!c)
                c = 1;

            for (x = vt->cx; x < vt->width - c; x++) {
                int y1 = (vt->y_base + vt->cy) % vt->total_height;
                TextCell *dst = &vt->cells[y1 * vt->width + x];
                TextCell *src = dst + c;
                *dst = *src;
                spiceterm_update_xy (vt, x + c, vt->cy);
                src->ch = ' ';
                src->attrib = vt->default_attrib;
                spiceterm_update_xy (vt, x, vt->cy);
            }
            break;
        case 's':
            /* save cursor position */
            spiceterm_save_cursor (vt);
            break;
        case 'u':
            /* restore cursor position */
            spiceterm_restore_cursor (vt);
            break;
        case 'X':
            /* erase c characters */
            c = vt->esc_buf[0];
            if (!c) c = 1;

            if (c > (vt->width - vt->cx)) c = vt->width - vt->cx;

            for(i = 0; i < c; i++) {
                spiceterm_clear_xy (vt, vt->cx + i, vt->cy);
            }
            break;
        case '@':
            /* insert c character */
            c = vt->esc_buf[0];
            if (c > (vt->width - vt->cx)) {
                c = vt->width - vt->cx;
            }
            if (!c) c = 1;

            for (x = vt->width - c; x >= vt->cx; x--) {
                int y1 = (vt->y_base + vt->cy) % vt->total_height;
                TextCell *src = &vt->cells[y1 * vt->width + x];
                TextCell *dst = src + c;
                *dst = *src;
                spiceterm_update_xy (vt, x + c, vt->cy);
                src->ch = ' ';
                src->attrib = vt->cur_attrib;
                spiceterm_update_xy (vt, x, vt->cy);
            }

            break;
        case 'r':
            /* set region */
            if (!vt->esc_buf[0])
                vt->esc_buf[0]++;
            if (!vt->esc_buf[1])
                vt->esc_buf[1] = vt->height;
            /* Minimum allowed region is 2 lines */
            if (vt->esc_buf[0] < vt->esc_buf[1] &&
                vt->esc_buf[1] <= vt->height) {
                vt->region_top = vt->esc_buf[0] - 1;
                vt->region_bottom = vt->esc_buf[1];
                vt->cx = 0;
                vt->cy = vt->region_top;
                DPRINTF(1, "set region %d %d", vt->region_top, vt->region_bottom);
            }

            break;
        default:
            if (debug) {
                debug_print_escape_buffer(vt, __func__, " unhandled escape", qes, ch);
            }
            break;
        }
        vt->esc_ques = 0;
        break;
    case ESsetG0: // Set G0
        vt->tty_state = ESnormal;

        if (ch == '0')
            vt->g0enc = GRAF_MAP;
        else if (ch == 'B')
            vt->g0enc = LAT1_MAP;
        else if (ch == 'U')
            vt->g0enc = IBMPC_MAP;
        else if (ch == 'K')
            vt->g0enc = USER_MAP;

        if (vt->charset == 0)
            vt->cur_enc = vt->g0enc;

        break;
    case ESsetG1: // Set G1
        vt->tty_state = ESnormal;

        if (ch == '0')
            vt->g1enc = GRAF_MAP;
        else if (ch == 'B')
            vt->g1enc = LAT1_MAP;
        else if (ch == 'U')
            vt->g1enc = IBMPC_MAP;
        else if (ch == 'K')
            vt->g1enc = USER_MAP;

        if (vt->charset == 1)
            vt->cur_enc = vt->g1enc;

        break;
    case ESidquery: // vt100 query id
        vt->tty_state = ESnormal;

        if (ch == 'c') {
            DPRINTF(1, "ESC[>c   Query term ID");
            spiceterm_respond_esc (vt, TERMIDCODE);
        }
        break;
    case ESpercent:
        vt->tty_state = ESnormal;
        switch (ch) {
        case '@':  /* defined in ISO 2022 */
            vt->utf8 = 0;
            break;
        case 'G':  /* prelim official escape code */
        case '8':  /* retained for compatibility */
            vt->utf8 = 1;
            break;
        }
        break;
    default: // ESnormal
        vt->tty_state = ESnormal;

        switch(ch) {
        case 0:
            break;
        case 7:  /* alert aka. bell */
            // fixme:
            //rfbSendBell(vt->screen);
            break;
        case 8:  /* backspace */
            if (vt->cx > 0)
                vt->cx--;
            break;
        case 9:  /* tabspace */
            if (vt->cx + (8 - (vt->cx % 8)) > vt->width) {
                vt->cx = 0;
                spiceterm_put_lf (vt);
            } else {
                vt->cx = vt->cx + (8 - (vt->cx % 8));
            }
            break;
        case 10:  /* LF,*/
        case 11:  /* VT */
        case 12:  /* FF */
            spiceterm_put_lf (vt);
            break;
        case 13:  /* carriage return */
            vt->cx = 0;
            break;
        case 14:
            /* SI (shift in), select character set 1 */
            vt->charset = 1;
            vt->cur_enc = vt->g1enc;
            /* fixme: display controls = 1 */
            break;
        case 15:
            /* SO (shift out), select character set 0 */
            vt->charset = 0;
            vt->cur_enc = vt->g0enc;
            /* fixme: display controls = 0 */
            break;
        case 27:    /* esc */
            vt->tty_state = ESesc;
            break;
        case 127: /* delete */
            /* ignore */
            break;
        case 128+27:    /* csi */
            vt->tty_state = ESsquare;
            break;
        default:
            if (vt->cx >= vt->width) {
                /* line wrap */
                vt->cx = 0;
                spiceterm_put_lf (vt);
            }

            int y1 = (vt->y_base + vt->cy) % vt->total_height;
            TextCell *c = &vt->cells[y1*vt->width + vt->cx];
            c->attrib = vt->cur_attrib;
            c->ch = ch;
            spiceterm_update_xy (vt, vt->cx, vt->cy);
            vt->cx++;
            break;
        }
        break;
    }
}

static int
spiceterm_puts (spiceTerm *vt, const char *buf, int len)
{
    gunichar2 tc;

    spiceterm_show_cursor (vt, 0);

    while (len) {
        unsigned char c = *buf;
        len--;
        buf++;

        if (vt->tty_state != ESnormal) {
            // never translate escape sequence
            tc = c;
        } else if (vt->utf8 && !vt->cur_enc) {

            if(c & 0x80) { // utf8 multi-byte sequence

                if (vt->utf_count > 0 && (c & 0xc0) == 0x80) {
                    // inside UTF8 sequence
                    vt->utf_char = (vt->utf_char << 6) | (c & 0x3f);
                    vt->utf_count--;
                    if (vt->utf_count == 0) {
                        tc = vt->utf_char;
                    } else {
                        continue;
                    }
                } else {
                    //  first char of a UTF8 sequence
                    if ((c & 0xe0) == 0xc0) {
                        vt->utf_count = 1;
                        vt->utf_char = (c & 0x1f);
                    } else if ((c & 0xf0) == 0xe0) {
                        vt->utf_count = 2;
                        vt->utf_char = (c & 0x0f);
                    } else if ((c & 0xf8) == 0xf0) {
                        vt->utf_count = 3;
                        vt->utf_char = (c & 0x07);
                    } else if ((c & 0xfc) == 0xf8) {
                        vt->utf_count = 4;
                        vt->utf_char = (c & 0x03);
                    } else if ((c & 0xfe) == 0xfc) {
                        vt->utf_count = 5;
                        vt->utf_char = (c & 0x01);
                    } else
                        vt->utf_count = 0;

                    continue;
                }
            } else {
                // utf8 single byte
                tc = c;
                vt->utf_count = 0;
            }

        } else {
            // never translate controls
            if (c >= 32 && c != 127 && c != (128+27)) {
                tc = translations[vt->cur_enc][c & 0x0ff];
            } else {
                tc = c;
            }
        }

        spiceterm_putchar (vt, tc);
    }

    spiceterm_show_cursor (vt, 1);

    return len;
}

/* fixme:
void
spiceterm_set_xcut_text (char* str, int len, struct _rfbClientRec* cl)
{
  spiceTerm *vt =(spiceTerm *)cl->screen->screenData;

  // seems str is Latin-1 encoded
  if (vt->selection) free (vt->selection);
  vt->selection = (gunichar2 *)malloc (len*sizeof (gunichar2));
  int i;
  for (i = 0; i < len; i++) {
    vt->selection[i] = str[i] & 0xff;
  }
  vt->selection_len = len;
}
*/
/*
static void
mouse_report (spiceTerm *vt, int butt, int mrx, int mry)
{
  char buf[8];

  sprintf (buf, "[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
	   (char)('!' + mry));

  spiceterm_respond_esc (vt, buf);
}
*/

void
spiceterm_toggle_marked_cell (spiceTerm *vt, int pos)
{

/* fixme:
  int x= (pos%vt->width)*8;
  int y= (pos/vt->width)*16;

  int i,j;
  rfbScreenInfoPtr s=vt->screen;

  char *b = s->frameBuffer+y*s->width+x;

  for (j=0; j < 16; j++) {
    for(i=0; i < 8; i++) {
      b[j*s->width+i] ^= 0x0f;
      rfbMarkRectAsModified (s, x, y, x+8, y+16);
    }
  }
*/
}

/* fixme:

void
spiceterm_pointer_event (int buttonMask, int x, int y, rfbClientPtr cl)
{

  spiceTerm *vt =(spiceTerm *)cl->screen->screenData;
  static int button2_released = 1;
  static int last_mask = 0;
  static int sel_start_pos = 0;
  static int sel_end_pos = 0;
  int i;

  int cx = x/8;
  int cy = y/16;

  if (cx < 0) cx = 0;
  if (cx >= vt->width) cx = vt->width - 1;
  if (cy < 0) cy = 0;
  if (cy >= vt->height) cy = vt->height - 1;

  if (vt->report_mouse && buttonMask != last_mask) {
    last_mask = buttonMask;
    if (buttonMask & 1) {
      mouse_report (vt, 0, cx, cy);
    }
    if (buttonMask & 2) {
      mouse_report (vt, 1, cx, cy);
    }
    if (buttonMask & 4) {
      mouse_report (vt, 2, cx, cy);
    }
    if (!buttonMask) {
      mouse_report (vt, 3, cx, cy);
    }
  }

  if (buttonMask & 2) {
    if(button2_released && vt->selection) {
      int i;
      for(i = 0; i < vt->selection_len; i++) {
	if (vt->ibuf_count < IBUFSIZE - 6) { // uft8 is max 6 characters wide
	  if (vt->utf8) {
	    vt->ibuf_count += ucs2_to_utf8 (vt->selection[i], &vt->ibuf[vt->ibuf_count]);
	  } else  {
	    vt->ibuf[vt->ibuf_count++] = vt->selection[i];
	  }
	}
      }
      if (vt->y_displ != vt->y_base) {
	vt->y_displ = vt->y_base;
	spiceterm_refresh (vt);
      }
    }
    button2_released = 0;
  } else {
    button2_released = 1;
  }

  if (buttonMask & 1) {
    int pos = cy*vt->width + cx;

    // code borrowed from libvncserver (VNCconsole.c)

    if (!vt->mark_active) {

      vt->mark_active = 1;
      sel_start_pos = sel_end_pos = pos;
      spiceterm_toggle_marked_cell (vt, pos);

    } else {

      if (pos != sel_end_pos) {

	if (pos > sel_end_pos) {
	  cx = sel_end_pos; cy=pos;
	} else {
	  cx=pos; cy=sel_end_pos;
	}

	if (cx < sel_start_pos) {
	  if (cy < sel_start_pos) cy--;
	} else {
	  cx++;
	}

	while (cx <= cy) {
	  spiceterm_toggle_marked_cell (vt, cx);
	  cx++;
	}

	sel_end_pos = pos;
      }
    }

  } else if (vt->mark_active) {
    vt->mark_active = 0;

    if (sel_start_pos > sel_end_pos) {
      int tmp = sel_start_pos - 1;
      sel_start_pos = sel_end_pos;
      sel_end_pos = tmp;
    }

    int len = sel_end_pos - sel_start_pos + 1;

    if (vt->selection) free (vt->selection);
    vt->selection = (gunichar2 *)malloc (len*sizeof (gunichar2));
    vt->selection_len = len;
    char *sel_latin1 = (char *)malloc (len + 1);

    for (i = 0; i < len; i++) {
      int pos = sel_start_pos + i;
      int x = pos % vt->width;
      int y1 = ((pos / vt->width) + vt->y_displ) % vt->total_height;
      TextCell *c = &vt->cells[y1*vt->width + x];
      vt->selection[i] = c->ch;
      sel_latin1[i] = (char)c->ch;
      c++;
    }
    sel_latin1[len] = 0;
    rfbGotXCutText (vt->screen, sel_latin1, len);
    free (sel_latin1);

    while (sel_start_pos <= sel_end_pos) {
      spiceterm_toggle_marked_cell (vt, sel_start_pos++);
    }

  }

  rfbDefaultPtrAddEvent (buttonMask, x, y, cl);

}
*/

static void 
my_kbd_push_key(SpiceKbdInstance *sin, uint8_t frag)
{
    // spiceTerm *vt = SPICE_CONTAINEROF(sin, spiceTerm, keyboard_sin);

    /* we no not need this */

    return;
}

static void 
my_kbd_push_keyval(SpiceKbdInstance *sin, uint32_t keySym, int flags)
{
    spiceTerm *vt = SPICE_CONTAINEROF(sin, spiceTerm, keyboard_sin);
    static int control = 0;
    static int shift = 0;
    char *esc = NULL;

    guint uc = 0;

    DPRINTF(1, "flags=%d keySym=%08x", flags, keySym);

    if (flags & 1) {
        if (keySym == GDK_KEY_Shift_L || keySym == GDK_KEY_Shift_R) {
            shift = 1;
        } if (keySym == GDK_KEY_Control_L || keySym == GDK_KEY_Control_R) {
            control = 1;
        } else if (vt->ibuf_count < (IBUFSIZE - 32)) {

            if (control) {
                if(keySym >= 'a' && keySym <= 'z')
                    uc = keySym - 'a' + 1;
                else if (keySym >= 'A' && keySym <= 'Z')
                    uc = keySym - 'A' + 1;
                else
                    uc = 0;

            } else {
                switch (keySym) {
                case GDK_KEY_Escape:
                    uc = 27; break;
                case GDK_KEY_Return:
                    uc = '\r'; break;
                case GDK_KEY_BackSpace:
                    uc = 8; break;
                case GDK_KEY_Tab:
                    uc = '\t'; break;
                case GDK_KEY_Delete: /* kdch1 */
                case GDK_KEY_KP_Delete:
                    esc = "[3~";break;
                case GDK_KEY_Home: /* khome */
                case GDK_KEY_KP_Home:
                    esc = "OH";break;
                case GDK_KEY_End:
                case GDK_KEY_KP_End: /* kend */
                    esc = "OF";break;
                case GDK_KEY_Insert: /* kich1 */
                case GDK_KEY_KP_Insert:
                    esc = "[2~";break;
                case GDK_KEY_Up:
                case GDK_KEY_KP_Up:  /* kcuu1 */
                    esc = "OA";break;
                case GDK_KEY_Down: /* kcud1 */
                case GDK_KEY_KP_Down:
                    esc = "OB";break;
                case GDK_KEY_Right:
                case GDK_KEY_KP_Right: /* kcuf1 */
                    esc = "OC";break;
                case GDK_KEY_Left:
                case GDK_KEY_KP_Left: /* kcub1 */
                    esc = "OD";break;
                case GDK_KEY_Page_Up:
                    if (shift) {
                        spiceterm_virtual_scroll (vt, -vt->height/2);
                        goto ret;
                    }
                    esc = "[5~";break;
                case GDK_KEY_Page_Down:
                    if (shift) {
                        spiceterm_virtual_scroll (vt, vt->height/2);
                        goto ret;
                    }
                    esc = "[6~";break;
                case GDK_KEY_F1:
                    esc = "OP";break;
                case GDK_KEY_F2:
                    esc = "OQ";break;
                case GDK_KEY_F3:
                    esc = "OR";break;
                case GDK_KEY_F4:
                    esc = "OS";break;
                case GDK_KEY_F5:
                    esc = "[15~";break;
                case GDK_KEY_F6:
                    esc = "[17~";break;
                case GDK_KEY_F7:
                    esc = "[18~";break;
                case GDK_KEY_F8:
                    esc = "[19~";break;
                case GDK_KEY_F9:
                    esc = "[20~";break;
                case GDK_KEY_F10:
                    esc = "[21~";break;
                case GDK_KEY_F11:
                    esc = "[23~";break;
                case GDK_KEY_F12:
                    esc = "[24~";break;
                default:
                    if (keySym < 0x100) {
                        uc = keySym;
                    }
                    break;
                }
            }

            DPRINTF(1, "escape=%s unicode=%08x\n", esc, uc);

            if (vt->y_displ != vt->y_base) {
                vt->y_displ = vt->y_base;
                spiceterm_refresh (vt);
            }

            if (esc) {
                spiceterm_respond_esc(vt, esc);
            } else if (uc > 0) {
                if (vt->utf8) {
                    gchar buf[10];
                    gint len = g_unichar_to_utf8(uc, buf);

                    if (len > 0) {
                        int i;
                        for (i = 0; i < len; i++) {
                            vt->ibuf[vt->ibuf_count++] = buf[i];
                        }
                    }
                } else {
                    vt->ibuf[vt->ibuf_count++] = (char)uc;
                }
            }
        }
    }


ret:

    if (flags & 2) { // UP
        if (keySym == GDK_KEY_Shift_L || keySym == GDK_KEY_Shift_R) {
            shift = 0;
        } else if (keySym == GDK_KEY_Control_L || keySym == GDK_KEY_Control_R) {
            control = 0;
        }
    }

    vt->screen->core->watch_update_mask(vt->screen->mwatch,
                                        SPICE_WATCH_EVENT_READ|SPICE_WATCH_EVENT_WRITE);
}

static uint8_t 
my_kbd_get_leds(SpiceKbdInstance *sin)
{
    return 0;
}

static SpiceKbdInterface my_keyboard_sif = {
    .base.type          = SPICE_INTERFACE_KEYBOARD ,
    .base.description   = "spiceterm keyboard device",
    .base.major_version = SPICE_INTERFACE_KEYBOARD_MAJOR,
    .base.minor_version = SPICE_INTERFACE_KEYBOARD_MINOR,
    .push_keyval        = my_kbd_push_keyval,
    .push_scan_freg     = my_kbd_push_key,
    .get_leds           = my_kbd_get_leds,
};

spiceTerm *
create_spiceterm(int argc, char** argv, int maxx, int maxy)
{
    int i;

    SpiceScreen *spice_screen;

    SpiceCoreInterface *core = basic_event_loop_init();
    spice_screen = spice_screen_new(core);
    //spice_server_set_image_compression(server, SPICE_IMAGE_COMPRESS_OFF);
    spice_screen_add_display_interface(spice_screen);
    spice_screen_add_agent_interface(spice_screen->server);

    spiceTerm *vt = (spiceTerm *)calloc (sizeof(spiceTerm), 1);

    vt->keyboard_sin.base.sif = &my_keyboard_sif.base;
    spice_server_add_interface(spice_screen->server, &vt->keyboard_sin.base);

    // screen->setXCutText = spiceterm_set_xcut_text;
    // screen->ptrAddEvent = spiceterm_pointer_event;
    // screen->newClientHook = new_client;
    // screen->desktopName = "SPICE Command Terminal";

    vt->maxx = spice_screen->width;
    vt->maxy = spice_screen->height;

    vt->width = vt->maxx / 8;
    vt->height = vt->maxy / 16;

    vt->total_height = vt->height * 20;
    vt->scroll_height = 0;
    vt->y_base =  0;
    vt->y_displ =  0;

    vt->region_top = 0;
    vt->region_bottom = vt->height;

    vt->g0enc = LAT1_MAP;
    vt->g1enc = GRAF_MAP;
    vt->cur_enc = vt->g0enc;
    vt->charset = 0;

    /* default text attributes */
    vt->default_attrib.bold = 0;
    vt->default_attrib.uline = 0;
    vt->default_attrib.blink = 0;
    vt->default_attrib.invers = 0;
    vt->default_attrib.unvisible = 0;
    vt->default_attrib.fgcol = 7;
    vt->default_attrib.bgcol = 0;

    vt->cur_attrib = vt->default_attrib;

    vt->cells = (TextCell *)calloc (sizeof (TextCell), vt->width*vt->total_height);

    for (i = 0; i < vt->width*vt->total_height; i++) {
        vt->cells[i].ch = ' ';
        vt->cells[i].attrib = vt->default_attrib;
    }

    vt->altcells = (TextCell *)calloc (sizeof (TextCell), vt->width*vt->height);

    vt->screen = spice_screen;

    return vt;
}

static void 
master_watch(int master, int event, void *opaque)
{
    spiceTerm *vt = (spiceTerm *)opaque;

    // fixme: if (!vt->mark_active) {

    if (event == SPICE_WATCH_EVENT_READ) {
        char buffer[1024];
        int c;
        while ((c = read(master, buffer, 1024)) == -1) {
	    if (errno != EAGAIN) break;
        }
        if (c == -1) {
            g_error("got read error"); // fixme
        }
        spiceterm_puts (vt, buffer, c);
    } else {
        if (vt->ibuf_count > 0) {
            DPRINTF(1, "write input %x %d", vt->ibuf[0], vt->ibuf_count);
            write (master, vt->ibuf, vt->ibuf_count);
            vt->ibuf_count = 0; // fixme: what if not all data written
        }
        vt->screen->core->watch_update_mask(vt->screen->mwatch, SPICE_WATCH_EVENT_READ);
    }
}

int
main (int argc, char** argv)
{
    int i;
    char **cmdargv = NULL;
    char *command = "/bin/bash"; // execute normal shell as default
    int pid;
    int master;
    char ptyname[1024];
    struct winsize dimensions;

    g_thread_init(NULL);

    for (i = 1; i < argc; i++) {
        if (!strcmp (argv[i], "-c")) {
            command = argv[i+1];
            cmdargv = &argv[i+1];
            argc = i;
            argv[i] = NULL;
            break;
        }
    }

    if (0) print_usage(NULL); // fixme:

    spiceTerm *vt = create_spiceterm (argc, argv, 745, 400);

    setlocale(LC_ALL, ""); // set from environment

    char *ctype = setlocale (LC_CTYPE, NULL); // query LC_CTYPE

    // fixme: ist there a standard way to detect utf8 mode ?
    if (strcasestr (ctype, ".utf-8")||strcasestr (ctype, ".utf8")) {
        vt->utf8 = 1;
    }

    dimensions.ws_col = vt->width;
    dimensions.ws_row = vt->height;

    setenv ("TERM", TERM, 1);

    DPRINTF(1, "execute %s", command);

    pid = forkpty (&master, ptyname, NULL, &dimensions);
    if(!pid) {

        // install default signal handlers
        signal (SIGQUIT, SIG_DFL);
        signal (SIGTERM, SIG_DFL);
        signal (SIGINT, SIG_DFL);

        if (cmdargv) {
            execvp (command, cmdargv);
        } else {
            execlp (command, command, NULL);
        }
        perror ("Error: exec failed\n");
        exit (-1); // should not be reached
    } else if (pid == -1) {
        perror ("Error: fork failed\n");
        exit (-1);
    }


    vt->screen->mwatch = vt->screen->core->watch_add(
        master, SPICE_WATCH_EVENT_READ /* |SPICE_WATCH_EVENT_WRITE */,
        master_watch, vt);

    basic_event_loop_mainloop();

    //rfbProcessEvents (vt->screen, 40000); /* 40 ms */

    /*
      if (vt->ibuf_count > 0) {
      printf ("DEBUG: WRITE %d %d\n", vt->ibuf[0], vt->ibuf_count);
      write (master, vt->ibuf, vt->ibuf_count);
      vt->ibuf_count = 0;
      last_time = time (NULL);
      }
    */

    kill (pid, 9);
    int status;
    waitpid(pid, &status, 0);

    exit (0);
}