Change uxsel_input_add's return type from int to pointer.

[PuTTY.git] / unix / gtkwin.c

/*
 * gtkwin.c: the main code that runs a PuTTY terminal emulator and
 * backend in a GTK window.
 */

#define _GNU_SOURCE

#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <stdio.h>
#include <time.h>
#include <errno.h>
#include <locale.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <gtk/gtk.h>
#if !GTK_CHECK_VERSION(3,0,0)
#include <gdk/gdkkeysyms.h>
#endif
#ifndef NOT_X_WINDOWS
#include <gdk/gdkx.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#endif

#if GTK_CHECK_VERSION(2,0,0)
#include <gtk/gtkimmodule.h>
#endif

#define PUTTY_DO_GLOBALS               /* actually _define_ globals */

#define MAY_REFER_TO_GTK_IN_HEADERS

#include "putty.h"
#include "terminal.h"
#include "gtkcompat.h"
#include "gtkfont.h"

#define CAT2(x,y) x ## y
#define CAT(x,y) CAT2(x,y)
#define ASSERT(x) enum {CAT(assertion_,__LINE__) = 1 / (x)}

#if GTK_CHECK_VERSION(2,0,0)
ASSERT(sizeof(long) <= sizeof(gsize));
#define LONG_TO_GPOINTER(l) GSIZE_TO_POINTER(l)
#define GPOINTER_TO_LONG(p) GPOINTER_TO_SIZE(p)
#else /* Gtk 1.2 */
ASSERT(sizeof(long) <= sizeof(gpointer));
#define LONG_TO_GPOINTER(l) ((gpointer)(long)(l))
#define GPOINTER_TO_LONG(p) ((long)(p))
#endif

/* Colours come in two flavours: configurable, and xterm-extended. */
#define NEXTCOLOURS 240 /* 216 colour-cube plus 24 shades of grey */
#define NALLCOLOURS (NCFGCOLOURS + NEXTCOLOURS)

GdkAtom compound_text_atom, utf8_string_atom;

extern char **pty_argv;        /* declared in pty.c */
extern int use_pty_argv;

/*
 * Timers are global across all sessions (even if we were handling
 * multiple sessions, which we aren't), so the current timer ID is
 * a global variable.
 */
static guint timer_id = 0;

struct gui_data {
    GtkWidget *window, *area, *sbar;
    GtkBox *hbox;
    GtkAdjustment *sbar_adjust;
    GtkWidget *menu, *specialsmenu, *specialsitem1, *specialsitem2,
        *restartitem;
    GtkWidget *sessionsmenu;
#ifndef NO_BACKING_PIXMAPS
    GdkPixmap *pixmap;
#endif
#if GTK_CHECK_VERSION(2,0,0)
    GtkIMContext *imc;
#endif
    unifont *fonts[4];                 /* normal, bold, wide, widebold */
#if GTK_CHECK_VERSION(2,0,0)
    const char *geometry;
#else
    int xpos, ypos, gotpos, gravity;
#endif
    GdkCursor *rawcursor, *textcursor, *blankcursor, *waitcursor, *currcursor;
    GdkColor cols[NALLCOLOURS];
    GdkColormap *colmap;
    wchar_t *pastein_data;
    int direct_to_font;
    int pastein_data_len;
    char *pasteout_data, *pasteout_data_ctext, *pasteout_data_utf8;
    int pasteout_data_len, pasteout_data_ctext_len, pasteout_data_utf8_len;
    int font_width, font_height;
    int width, height;
    int ignore_sbar;
    int mouseptr_visible;
    int busy_status;
    guint toplevel_callback_idle_id;
    int idle_fn_scheduled, quit_fn_scheduled;
    int alt_keycode;
    int alt_digits;
    char *wintitle;
    char *icontitle;
    int master_fd, master_func_id;
    void *ldisc;
    Backend *back;
    void *backhandle;
    Terminal *term;
    void *logctx;
    int exited;
    struct unicode_data ucsdata;
    Conf *conf;
    void *eventlogstuff;
    char *progname, **gtkargvstart;
    int ngtkargs;
    guint32 input_event_time; /* Timestamp of the most recent input event. */
    int reconfiguring;
    /* Cached things out of conf that we refer to a lot */
    int bold_style;
    int window_border;
    int cursor_type;
    int drawtype;
};

static void cache_conf_values(struct gui_data *inst)
{
    inst->bold_style = conf_get_int(inst->conf, CONF_bold_style);
    inst->window_border = conf_get_int(inst->conf, CONF_window_border);
    inst->cursor_type = conf_get_int(inst->conf, CONF_cursor_type);
}

struct draw_ctx {
    struct gui_data *inst;
    unifont_drawctx uctx;
};

static int send_raw_mouse;

static const char *app_name = "pterm";

static void start_backend(struct gui_data *inst);
static void exit_callback(void *vinst);

char *x_get_default(const char *key)
{
#ifndef NOT_X_WINDOWS
    return XGetDefault(GDK_DISPLAY_XDISPLAY(gdk_display_get_default()),
                       app_name, key);
#else
    return NULL;
#endif
}

void connection_fatal(void *frontend, const char *p, ...)
{
    struct gui_data *inst = (struct gui_data *)frontend;

    va_list ap;
    char *msg;
    va_start(ap, p);
    msg = dupvprintf(p, ap);
    va_end(ap);
    fatal_message_box(inst->window, msg);
    sfree(msg);

    queue_toplevel_callback(exit_callback, inst);
}

/*
 * Default settings that are specific to pterm.
 */
FontSpec *platform_default_fontspec(const char *name)
{
    if (!strcmp(name, "Font"))
        return fontspec_new("server:fixed");
    else
        return fontspec_new("");
}

Filename *platform_default_filename(const char *name)
{
    if (!strcmp(name, "LogFileName"))
        return filename_from_str("putty.log");
    else
        return filename_from_str("");
}

char *platform_default_s(const char *name)
{
    if (!strcmp(name, "SerialLine"))
        return dupstr("/dev/ttyS0");
    return NULL;
}

int platform_default_i(const char *name, int def)
{
    if (!strcmp(name, "CloseOnExit"))
        return 2;  /* maps to FORCE_ON after painful rearrangement :-( */
    if (!strcmp(name, "WinNameAlways"))
        return 0;  /* X natively supports icon titles, so use 'em by default */
    return def;
}

/* Dummy routine, only required in plink. */
void frontend_echoedit_update(void *frontend, int echo, int edit)
{
}

char *get_ttymode(void *frontend, const char *mode)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    return term_get_ttymode(inst->term, mode);
}

int from_backend(void *frontend, int is_stderr, const char *data, int len)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    return term_data(inst->term, is_stderr, data, len);
}

int from_backend_untrusted(void *frontend, const char *data, int len)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    return term_data_untrusted(inst->term, data, len);
}

int from_backend_eof(void *frontend)
{
    return TRUE;   /* do respond to incoming EOF with outgoing */
}

int get_userpass_input(prompts_t *p, const unsigned char *in, int inlen)
{
    struct gui_data *inst = (struct gui_data *)p->frontend;
    int ret;
    ret = cmdline_get_passwd_input(p, in, inlen);
    if (ret == -1)
        ret = term_get_userpass_input(inst->term, p, in, inlen);
    return ret;
}

void logevent(void *frontend, const char *string)
{
    struct gui_data *inst = (struct gui_data *)frontend;

    log_eventlog(inst->logctx, string);

    logevent_dlg(inst->eventlogstuff, string);
}

int font_dimension(void *frontend, int which)/* 0 for width, 1 for height */
{
    struct gui_data *inst = (struct gui_data *)frontend;

    if (which)
        return inst->font_height;
    else
        return inst->font_width;
}

/*
 * Translate a raw mouse button designation (LEFT, MIDDLE, RIGHT)
 * into a cooked one (SELECT, EXTEND, PASTE).
 * 
 * In Unix, this is not configurable; the X button arrangement is
 * rock-solid across all applications, everyone has a three-button
 * mouse or a means of faking it, and there is no need to switch
 * buttons around at all.
 */
static Mouse_Button translate_button(Mouse_Button button)
{
    /* struct gui_data *inst = (struct gui_data *)frontend; */

    if (button == MBT_LEFT)
        return MBT_SELECT;
    if (button == MBT_MIDDLE)
        return MBT_PASTE;
    if (button == MBT_RIGHT)
        return MBT_EXTEND;
    return 0;                          /* shouldn't happen */
}

/*
 * Return the top-level GtkWindow associated with a particular
 * front end instance.
 */
void *get_window(void *frontend)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    return inst->window;
}

/*
 * Minimise or restore the window in response to a server-side
 * request.
 */
void set_iconic(void *frontend, int iconic)
{
    /*
     * GTK 1.2 doesn't know how to do this.
     */
#if GTK_CHECK_VERSION(2,0,0)
    struct gui_data *inst = (struct gui_data *)frontend;
    if (iconic)
        gtk_window_iconify(GTK_WINDOW(inst->window));
    else
        gtk_window_deiconify(GTK_WINDOW(inst->window));
#endif
}

/*
 * Move the window in response to a server-side request.
 */
void move_window(void *frontend, int x, int y)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    /*
     * I assume that when the GTK version of this call is available
     * we should use it. Not sure how it differs from the GDK one,
     * though.
     */
#if GTK_CHECK_VERSION(2,0,0)
    gtk_window_move(GTK_WINDOW(inst->window), x, y);
#else
    gdk_window_move(gtk_widget_get_window(inst->window), x, y);
#endif
}

/*
 * Move the window to the top or bottom of the z-order in response
 * to a server-side request.
 */
void set_zorder(void *frontend, int top)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    if (top)
        gdk_window_raise(gtk_widget_get_window(inst->window));
    else
        gdk_window_lower(gtk_widget_get_window(inst->window));
}

/*
 * Refresh the window in response to a server-side request.
 */
void refresh_window(void *frontend)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    term_invalidate(inst->term);
}

/*
 * Maximise or restore the window in response to a server-side
 * request.
 */
void set_zoomed(void *frontend, int zoomed)
{
    /*
     * GTK 1.2 doesn't know how to do this.
     */
#if GTK_CHECK_VERSION(2,0,0)
    struct gui_data *inst = (struct gui_data *)frontend;
    if (zoomed)
        gtk_window_maximize(GTK_WINDOW(inst->window));
    else
        gtk_window_unmaximize(GTK_WINDOW(inst->window));
#endif
}

/*
 * Report whether the window is iconic, for terminal reports.
 */
int is_iconic(void *frontend)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    return !gdk_window_is_viewable(gtk_widget_get_window(inst->window));
}

/*
 * Report the window's position, for terminal reports.
 */
void get_window_pos(void *frontend, int *x, int *y)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    /*
     * I assume that when the GTK version of this call is available
     * we should use it. Not sure how it differs from the GDK one,
     * though.
     */
#if GTK_CHECK_VERSION(2,0,0)
    gtk_window_get_position(GTK_WINDOW(inst->window), x, y);
#else
    gdk_window_get_position(gtk_widget_get_window(inst->window), x, y);
#endif
}

/*
 * Report the window's pixel size, for terminal reports.
 */
void get_window_pixels(void *frontend, int *x, int *y)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    /*
     * I assume that when the GTK version of this call is available
     * we should use it. Not sure how it differs from the GDK one,
     * though.
     */
#if GTK_CHECK_VERSION(2,0,0)
    gtk_window_get_size(GTK_WINDOW(inst->window), x, y);
#else
    gdk_window_get_size(gtk_widget_get_window(inst->window), x, y);
#endif
}

/*
 * Return the window or icon title.
 */
char *get_window_title(void *frontend, int icon)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    return icon ? inst->icontitle : inst->wintitle;
}

gint delete_window(GtkWidget *widget, GdkEvent *event, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    if (!inst->exited && conf_get_int(inst->conf, CONF_warn_on_close)) {
        if (!reallyclose(inst))
            return TRUE;
    }
    return FALSE;
}

static void update_mouseptr(struct gui_data *inst)
{
    switch (inst->busy_status) {
      case BUSY_NOT:
        if (!inst->mouseptr_visible) {
            gdk_window_set_cursor(gtk_widget_get_window(inst->area),
                                  inst->blankcursor);
        } else if (send_raw_mouse) {
            gdk_window_set_cursor(gtk_widget_get_window(inst->area),
                                  inst->rawcursor);
        } else {
            gdk_window_set_cursor(gtk_widget_get_window(inst->area),
                                  inst->textcursor);
        }
        break;
      case BUSY_WAITING:    /* XXX can we do better? */
      case BUSY_CPU:
        /* We always display these cursors. */
        gdk_window_set_cursor(gtk_widget_get_window(inst->area),
                              inst->waitcursor);
        break;
      default:
        assert(0);
    }
}

static void show_mouseptr(struct gui_data *inst, int show)
{
    if (!conf_get_int(inst->conf, CONF_hide_mouseptr))
        show = 1;
    inst->mouseptr_visible = show;
    update_mouseptr(inst);
}

static void draw_backing_rect(struct gui_data *inst);

gint configure_area(GtkWidget *widget, GdkEventConfigure *event, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    int w, h, need_size = 0;

    /*
     * See if the terminal size has changed, in which case we must
     * let the terminal know.
     */
    w = (event->width - 2*inst->window_border) / inst->font_width;
    h = (event->height - 2*inst->window_border) / inst->font_height;
    if (w != inst->width || h != inst->height) {
        inst->width = w;
        inst->height = h;
        conf_set_int(inst->conf, CONF_width, inst->width);
        conf_set_int(inst->conf, CONF_height, inst->height);
        need_size = 1;
    }

#ifndef NO_BACKING_PIXMAPS
    if (inst->pixmap) {
        gdk_pixmap_unref(inst->pixmap);
        inst->pixmap = NULL;
    }

    inst->pixmap = gdk_pixmap_new(gtk_widget_get_window(widget),
                                  (w * inst->font_width + 2*inst->window_border),
                                  (h * inst->font_height + 2*inst->window_border), -1);
#endif

    draw_backing_rect(inst);

    if (need_size && inst->term) {
        term_size(inst->term, h, w, conf_get_int(inst->conf, CONF_savelines));
    }

    if (inst->term)
        term_invalidate(inst->term);

#if GTK_CHECK_VERSION(2,0,0)
    gtk_im_context_set_client_window(inst->imc, gtk_widget_get_window(widget));
#endif

    return TRUE;
}

gint expose_area(GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;

#ifndef NO_BACKING_PIXMAPS
    /*
     * Pass the exposed rectangle to terminal.c, which will call us
     * back to do the actual painting.
     */
    if (inst->pixmap) {
        gdk_draw_pixmap(gtk_widget_get_window(widget),
                        (gtk_widget_get_style(widget)->fg_gc
                         [gtk_widget_get_state(widget)]),
                        inst->pixmap,
                        event->area.x, event->area.y,
                        event->area.x, event->area.y,
                        event->area.width, event->area.height);
    }
#else
    if (inst->term) {
        Context ctx = get_ctx(inst);
        /*
         * As in window.c, we clear the 'immediately' flag in the
         * term_paint() call if the terminal has an update pending, in
         * case we're constrained within this event to only draw on
         * the exposed rectangle of the window. (Because if the whole
         * of a character cell needs a redraw due to a terminal
         * contents change, the last thing we want is to give it a
         * _partial_ redraw here due to system-imposed clipping, and
         * then have the next main terminal update believe it's been
         * redrawn in full.)
         *
         * I don't actually know if GTK expose events will constrain
         * us in this way, but it's best to be careful...
         */
        term_paint(inst->term, ctx,
                   (event->area.x - inst->window_border) / inst->font_width,
                   (event->area.y - inst->window_border) / inst->font_height,
                   (event->area.x + event->area.width -
                    inst->window_border) / inst->font_width,
                   (event->area.y + event->area.height -
                    inst->window_border) / inst->font_height,
                   !inst->term->window_update_pending);
        free_ctx(ctx);
    }
#endif

    return TRUE;
}

#define KEY_PRESSED(k) \
    (inst->keystate[(k) / 32] & (1 << ((k) % 32)))

gint key_event(GtkWidget *widget, GdkEventKey *event, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    char output[256];
    wchar_t ucsoutput[2];
    int ucsval, start, end, special, output_charset, use_ucsoutput;
    int nethack_mode, app_keypad_mode;

    /* Remember the timestamp. */
    inst->input_event_time = event->time;

    /* By default, nothing is generated. */
    end = start = 0;
    special = use_ucsoutput = FALSE;
    output_charset = CS_ISO8859_1;

    /*
     * If Alt is being released after typing an Alt+numberpad
     * sequence, we should generate the code that was typed.
     * 
     * Note that we only do this if more than one key was actually
     * pressed - I don't think Alt+NumPad4 should be ^D or that
     * Alt+NumPad3 should be ^C, for example. There's no serious
     * inconvenience in having to type a zero before a single-digit
     * character code.
     */
    if (event->type == GDK_KEY_RELEASE) {
        if ((event->keyval == GDK_KEY_Meta_L ||
             event->keyval == GDK_KEY_Meta_R ||
             event->keyval == GDK_KEY_Alt_L ||
             event->keyval == GDK_KEY_Alt_R) &&
            inst->alt_keycode >= 0 && inst->alt_digits > 1) {
#ifdef KEY_DEBUGGING
            printf("Alt key up, keycode = %d\n", inst->alt_keycode);
#endif
            /*
             * FIXME: we might usefully try to do something clever here
             * about interpreting the generated key code in a way that's
             * appropriate to the line code page.
             */
            output[0] = inst->alt_keycode;
            end = 1;
            goto done;
        }
#if GTK_CHECK_VERSION(2,0,0)
        if (gtk_im_context_filter_keypress(inst->imc, event))
            return TRUE;
#endif
    }

    if (event->type == GDK_KEY_PRESS) {
#ifdef KEY_DEBUGGING
        {
            int i;
            printf("keypress: keyval = %04x, state = %08x; string =",
                   event->keyval, event->state);
            for (i = 0; event->string[i]; i++)
                printf(" %02x", (unsigned char) event->string[i]);
            printf("\n");
        }
#endif

        /*
         * NYI: Compose key (!!! requires Unicode faff before even trying)
         */

        /*
         * If Alt has just been pressed, we start potentially
         * accumulating an Alt+numberpad code. We do this by
         * setting alt_keycode to -1 (nothing yet but plausible).
         */
        if ((event->keyval == GDK_KEY_Meta_L ||
             event->keyval == GDK_KEY_Meta_R ||
             event->keyval == GDK_KEY_Alt_L ||
             event->keyval == GDK_KEY_Alt_R)) {
            inst->alt_keycode = -1;
            inst->alt_digits = 0;
            goto done;                 /* this generates nothing else */
        }

        /*
         * If we're seeing a numberpad key press with Mod1 down,
         * consider adding it to alt_keycode if that's sensible.
         * Anything _else_ with Mod1 down cancels any possibility
         * of an ALT keycode: we set alt_keycode to -2.
         */
        if ((event->state & GDK_MOD1_MASK) && inst->alt_keycode != -2) {
            int digit = -1;
            switch (event->keyval) {
              case GDK_KEY_KP_0: case GDK_KEY_KP_Insert: digit = 0; break;
              case GDK_KEY_KP_1: case GDK_KEY_KP_End: digit = 1; break;
              case GDK_KEY_KP_2: case GDK_KEY_KP_Down: digit = 2; break;
              case GDK_KEY_KP_3: case GDK_KEY_KP_Page_Down: digit = 3; break;
              case GDK_KEY_KP_4: case GDK_KEY_KP_Left: digit = 4; break;
              case GDK_KEY_KP_5: case GDK_KEY_KP_Begin: digit = 5; break;
              case GDK_KEY_KP_6: case GDK_KEY_KP_Right: digit = 6; break;
              case GDK_KEY_KP_7: case GDK_KEY_KP_Home: digit = 7; break;
              case GDK_KEY_KP_8: case GDK_KEY_KP_Up: digit = 8; break;
              case GDK_KEY_KP_9: case GDK_KEY_KP_Page_Up: digit = 9; break;
            }
            if (digit < 0)
                inst->alt_keycode = -2;   /* it's invalid */
            else {
#ifdef KEY_DEBUGGING
                printf("Adding digit %d to keycode %d", digit,
                       inst->alt_keycode);
#endif
                if (inst->alt_keycode == -1)
                    inst->alt_keycode = digit;   /* one-digit code */
                else
                    inst->alt_keycode = inst->alt_keycode * 10 + digit;
                inst->alt_digits++;
#ifdef KEY_DEBUGGING
                printf(" gives new code %d\n", inst->alt_keycode);
#endif
                /* Having used this digit, we now do nothing more with it. */
                goto done;
            }
        }

        /*
         * Shift-PgUp and Shift-PgDn don't even generate keystrokes
         * at all.
         */
        if (event->keyval == GDK_KEY_Page_Up &&
            (event->state & GDK_SHIFT_MASK)) {
            term_scroll(inst->term, 0, -inst->height/2);
            return TRUE;
        }
        if (event->keyval == GDK_KEY_Page_Up &&
            (event->state & GDK_CONTROL_MASK)) {
            term_scroll(inst->term, 0, -1);
            return TRUE;
        }
        if (event->keyval == GDK_KEY_Page_Down &&
            (event->state & GDK_SHIFT_MASK)) {
            term_scroll(inst->term, 0, +inst->height/2);
            return TRUE;
        }
        if (event->keyval == GDK_KEY_Page_Down &&
            (event->state & GDK_CONTROL_MASK)) {
            term_scroll(inst->term, 0, +1);
            return TRUE;
        }

        /*
         * Neither does Shift-Ins.
         */
        if (event->keyval == GDK_KEY_Insert &&
            (event->state & GDK_SHIFT_MASK)) {
            request_paste(inst);
            return TRUE;
        }

        special = FALSE;
        use_ucsoutput = FALSE;

        nethack_mode = conf_get_int(inst->conf, CONF_nethack_keypad);
        app_keypad_mode = (inst->term->app_keypad_keys &&
                           !conf_get_int(inst->conf, CONF_no_applic_k));

        /* ALT+things gives leading Escape. */
        output[0] = '\033';
#if !GTK_CHECK_VERSION(2,0,0)
        /*
         * In vanilla X, and hence also GDK 1.2, the string received
         * as part of a keyboard event is assumed to be in
         * ISO-8859-1. (Seems woefully shortsighted in i18n terms,
         * but it's true: see the man page for XLookupString(3) for
         * confirmation.)
         */
        output_charset = CS_ISO8859_1;
        strncpy(output+1, event->string, lenof(output)-1);
#else
        /*
         * Most things can now be passed to
         * gtk_im_context_filter_keypress without breaking anything
         * below this point. An exception is the numeric keypad if
         * we're in Nethack or application mode: the IM will eat
         * numeric keypad presses if Num Lock is on, but we don't want
         * it to.
         */
        if (app_keypad_mode &&
            (event->keyval == GDK_KEY_Num_Lock ||
             event->keyval == GDK_KEY_KP_Divide ||
             event->keyval == GDK_KEY_KP_Multiply ||
             event->keyval == GDK_KEY_KP_Subtract ||
             event->keyval == GDK_KEY_KP_Add ||
             event->keyval == GDK_KEY_KP_Enter ||
             event->keyval == GDK_KEY_KP_0 ||
             event->keyval == GDK_KEY_KP_Insert ||
             event->keyval == GDK_KEY_KP_1 ||
             event->keyval == GDK_KEY_KP_End ||
             event->keyval == GDK_KEY_KP_2 ||
             event->keyval == GDK_KEY_KP_Down ||
             event->keyval == GDK_KEY_KP_3 ||
             event->keyval == GDK_KEY_KP_Page_Down ||
             event->keyval == GDK_KEY_KP_4 ||
             event->keyval == GDK_KEY_KP_Left ||
             event->keyval == GDK_KEY_KP_5 ||
             event->keyval == GDK_KEY_KP_Begin ||
             event->keyval == GDK_KEY_KP_6 ||
             event->keyval == GDK_KEY_KP_Right ||
             event->keyval == GDK_KEY_KP_7 ||
             event->keyval == GDK_KEY_KP_Home ||
             event->keyval == GDK_KEY_KP_8 ||
             event->keyval == GDK_KEY_KP_Up ||
             event->keyval == GDK_KEY_KP_9 ||
             event->keyval == GDK_KEY_KP_Page_Up ||
             event->keyval == GDK_KEY_KP_Decimal ||
             event->keyval == GDK_KEY_KP_Delete)) {
            /* app keypad; do nothing */
        } else if (nethack_mode &&
                   (event->keyval == GDK_KEY_KP_1 ||
                    event->keyval == GDK_KEY_KP_End ||
                    event->keyval == GDK_KEY_KP_2 ||
                    event->keyval == GDK_KEY_KP_Down ||
                    event->keyval == GDK_KEY_KP_3 ||
                    event->keyval == GDK_KEY_KP_Page_Down ||
                    event->keyval == GDK_KEY_KP_4 ||
                    event->keyval == GDK_KEY_KP_Left ||
                    event->keyval == GDK_KEY_KP_5 ||
                    event->keyval == GDK_KEY_KP_Begin ||
                    event->keyval == GDK_KEY_KP_6 ||
                    event->keyval == GDK_KEY_KP_Right ||
                    event->keyval == GDK_KEY_KP_7 ||
                    event->keyval == GDK_KEY_KP_Home ||
                    event->keyval == GDK_KEY_KP_8 ||
                    event->keyval == GDK_KEY_KP_Up ||
                    event->keyval == GDK_KEY_KP_9 ||
                    event->keyval == GDK_KEY_KP_Page_Up)) {
            /* nethack mode; do nothing */
        } else {
            if (gtk_im_context_filter_keypress(inst->imc, event))
                return TRUE;
        }

        /*
         * GDK 2.0 arranges to have done some translation for us: in
         * GDK 2.0, event->string is encoded in the current locale.
         *
         * So we use the standard C library function mbstowcs() to
         * convert from the current locale into Unicode; from there
         * we can convert to whatever PuTTY is currently working in.
         * (In fact I convert straight back to UTF-8 from
         * wide-character Unicode, for the sake of simplicity: that
         * way we can still use exactly the same code to manipulate
         * the string, such as prefixing ESC.)
         */
        output_charset = CS_UTF8;
        {
            wchar_t widedata[32];
            const wchar_t *wp;
            int wlen;
            int ulen;

            wlen = mb_to_wc(DEFAULT_CODEPAGE, 0,
                            event->string, strlen(event->string),
                            widedata, lenof(widedata)-1);

            wp = widedata;
            ulen = charset_from_unicode(&wp, &wlen, output+1, lenof(output)-2,
                                        CS_UTF8, NULL, NULL, 0);
            output[1+ulen] = '\0';
        }
#endif

        if (!output[1] &&
            (ucsval = keysym_to_unicode(event->keyval)) >= 0) {
            ucsoutput[0] = '\033';
            ucsoutput[1] = ucsval;
            use_ucsoutput = TRUE;
            end = 2;
        } else {
            output[lenof(output)-1] = '\0';
            end = strlen(output);
        }
        if (event->state & GDK_MOD1_MASK) {
            start = 0;
            if (end == 1) end = 0;
        } else
            start = 1;

        /* Control-` is the same as Control-\ (unless gtk has a better idea) */
        if (!output[1] && event->keyval == '`' &&
            (event->state & GDK_CONTROL_MASK)) {
            output[1] = '\x1C';
            use_ucsoutput = FALSE;
            end = 2;
        }

        /* Control-Break sends a Break special to the backend */
        if (event->keyval == GDK_KEY_Break &&
            (event->state & GDK_CONTROL_MASK)) {
            if (inst->back)
                inst->back->special(inst->backhandle, TS_BRK);
            return TRUE;
        }

        /* We handle Return ourselves, because it needs to be flagged as
         * special to ldisc. */
        if (event->keyval == GDK_KEY_Return) {
            output[1] = '\015';
            use_ucsoutput = FALSE;
            end = 2;
            special = TRUE;
        }

        /* Control-2, Control-Space and Control-@ are NUL */
        if (!output[1] &&
            (event->keyval == ' ' || event->keyval == '2' ||
             event->keyval == '@') &&
            (event->state & (GDK_SHIFT_MASK |
                             GDK_CONTROL_MASK)) == GDK_CONTROL_MASK) {
            output[1] = '\0';
            use_ucsoutput = FALSE;
            end = 2;
        }

        /* Control-Shift-Space is 160 (ISO8859 nonbreaking space) */
        if (!output[1] && event->keyval == ' ' &&
            (event->state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK)) ==
            (GDK_SHIFT_MASK | GDK_CONTROL_MASK)) {
            output[1] = '\240';
            output_charset = CS_ISO8859_1;
            use_ucsoutput = FALSE;
            end = 2;
        }

        /* We don't let GTK tell us what Backspace is! We know better. */
        if (event->keyval == GDK_KEY_BackSpace &&
            !(event->state & GDK_SHIFT_MASK)) {
            output[1] = conf_get_int(inst->conf, CONF_bksp_is_delete) ?
                '\x7F' : '\x08';
            use_ucsoutput = FALSE;
            end = 2;
            special = TRUE;
        }
        /* For Shift Backspace, do opposite of what is configured. */
        if (event->keyval == GDK_KEY_BackSpace &&
            (event->state & GDK_SHIFT_MASK)) {
            output[1] = conf_get_int(inst->conf, CONF_bksp_is_delete) ?
                '\x08' : '\x7F';
            use_ucsoutput = FALSE;
            end = 2;
            special = TRUE;
        }

        /* Shift-Tab is ESC [ Z */
        if (event->keyval == GDK_KEY_ISO_Left_Tab ||
            (event->keyval == GDK_KEY_Tab &&
             (event->state & GDK_SHIFT_MASK))) {
            end = 1 + sprintf(output+1, "\033[Z");
            use_ucsoutput = FALSE;
        }
        /* And normal Tab is Tab, if the keymap hasn't already told us.
         * (Curiously, at least one version of the MacOS 10.5 X server
         * doesn't translate Tab for us. */
        if (event->keyval == GDK_KEY_Tab && end <= 1) {
            output[1] = '\t';
            end = 2;
        }

        /*
         * NetHack keypad mode.
         */
        if (nethack_mode) {
            const char *keys = NULL;
            switch (event->keyval) {
              case GDK_KEY_KP_1: case GDK_KEY_KP_End:
                keys = "bB\002"; break;
              case GDK_KEY_KP_2: case GDK_KEY_KP_Down:
                keys = "jJ\012"; break;
              case GDK_KEY_KP_3: case GDK_KEY_KP_Page_Down:
                keys = "nN\016"; break;
              case GDK_KEY_KP_4: case GDK_KEY_KP_Left:
                keys = "hH\010"; break;
              case GDK_KEY_KP_5: case GDK_KEY_KP_Begin:
                keys = "..."; break;
              case GDK_KEY_KP_6: case GDK_KEY_KP_Right:
                keys = "lL\014"; break;
              case GDK_KEY_KP_7: case GDK_KEY_KP_Home:
                keys = "yY\031"; break;
              case GDK_KEY_KP_8: case GDK_KEY_KP_Up:
                keys = "kK\013"; break;
              case GDK_KEY_KP_9: case GDK_KEY_KP_Page_Up:
                keys = "uU\025"; break;
            }
            if (keys) {
                end = 2;
                if (event->state & GDK_CONTROL_MASK)
                    output[1] = keys[2];
                else if (event->state & GDK_SHIFT_MASK)
                    output[1] = keys[1];
                else
                    output[1] = keys[0];
                use_ucsoutput = FALSE;
                goto done;
            }
        }

        /*
         * Application keypad mode.
         */
        if (app_keypad_mode) {
            int xkey = 0;
            switch (event->keyval) {
              case GDK_KEY_Num_Lock: xkey = 'P'; break;
              case GDK_KEY_KP_Divide: xkey = 'Q'; break;
              case GDK_KEY_KP_Multiply: xkey = 'R'; break;
              case GDK_KEY_KP_Subtract: xkey = 'S'; break;
                /*
                 * Keypad + is tricky. It covers a space that would
                 * be taken up on the VT100 by _two_ keys; so we
                 * let Shift select between the two. Worse still,
                 * in xterm function key mode we change which two...
                 */
              case GDK_KEY_KP_Add:
                if (conf_get_int(inst->conf, CONF_funky_type) == FUNKY_XTERM) {
                    if (event->state & GDK_SHIFT_MASK)
                        xkey = 'l';
                    else
                        xkey = 'k';
                } else if (event->state & GDK_SHIFT_MASK)
                        xkey = 'm';
                else
                    xkey = 'l';
                break;
              case GDK_KEY_KP_Enter: xkey = 'M'; break;
              case GDK_KEY_KP_0: case GDK_KEY_KP_Insert: xkey = 'p'; break;
              case GDK_KEY_KP_1: case GDK_KEY_KP_End: xkey = 'q'; break;
              case GDK_KEY_KP_2: case GDK_KEY_KP_Down: xkey = 'r'; break;
              case GDK_KEY_KP_3: case GDK_KEY_KP_Page_Down: xkey = 's'; break;
              case GDK_KEY_KP_4: case GDK_KEY_KP_Left: xkey = 't'; break;
              case GDK_KEY_KP_5: case GDK_KEY_KP_Begin: xkey = 'u'; break;
              case GDK_KEY_KP_6: case GDK_KEY_KP_Right: xkey = 'v'; break;
              case GDK_KEY_KP_7: case GDK_KEY_KP_Home: xkey = 'w'; break;
              case GDK_KEY_KP_8: case GDK_KEY_KP_Up: xkey = 'x'; break;
              case GDK_KEY_KP_9: case GDK_KEY_KP_Page_Up: xkey = 'y'; break;
              case GDK_KEY_KP_Decimal: case GDK_KEY_KP_Delete:
                xkey = 'n'; break;
            }
            if (xkey) {
                if (inst->term->vt52_mode) {
                    if (xkey >= 'P' && xkey <= 'S')
                        end = 1 + sprintf(output+1, "\033%c", xkey);
                    else
                        end = 1 + sprintf(output+1, "\033?%c", xkey);
                } else
                    end = 1 + sprintf(output+1, "\033O%c", xkey);
                use_ucsoutput = FALSE;
                goto done;
            }
        }

        /*
         * Next, all the keys that do tilde codes. (ESC '[' nn '~',
         * for integer decimal nn.)
         *
         * We also deal with the weird ones here. Linux VCs replace F1
         * to F5 by ESC [ [ A to ESC [ [ E. rxvt doesn't do _that_, but
         * does replace Home and End (1~ and 4~) by ESC [ H and ESC O w
         * respectively.
         */
        {
            int code = 0;
            int funky_type = conf_get_int(inst->conf, CONF_funky_type);
            switch (event->keyval) {
              case GDK_KEY_F1:
                code = (event->state & GDK_SHIFT_MASK ? 23 : 11);
                break;
              case GDK_KEY_F2:
                code = (event->state & GDK_SHIFT_MASK ? 24 : 12);
                break;
              case GDK_KEY_F3:
                code = (event->state & GDK_SHIFT_MASK ? 25 : 13);
                break;
              case GDK_KEY_F4:
                code = (event->state & GDK_SHIFT_MASK ? 26 : 14);
                break;
              case GDK_KEY_F5:
                code = (event->state & GDK_SHIFT_MASK ? 28 : 15);
                break;
              case GDK_KEY_F6:
                code = (event->state & GDK_SHIFT_MASK ? 29 : 17);
                break;
              case GDK_KEY_F7:
                code = (event->state & GDK_SHIFT_MASK ? 31 : 18);
                break;
              case GDK_KEY_F8:
                code = (event->state & GDK_SHIFT_MASK ? 32 : 19);
                break;
              case GDK_KEY_F9:
                code = (event->state & GDK_SHIFT_MASK ? 33 : 20);
                break;
              case GDK_KEY_F10:
                code = (event->state & GDK_SHIFT_MASK ? 34 : 21);
                break;
              case GDK_KEY_F11:
                code = 23;
                break;
              case GDK_KEY_F12:
                code = 24;
                break;
              case GDK_KEY_F13:
                code = 25;
                break;
              case GDK_KEY_F14:
                code = 26;
                break;
              case GDK_KEY_F15:
                code = 28;
                break;
              case GDK_KEY_F16:
                code = 29;
                break;
              case GDK_KEY_F17:
                code = 31;
                break;
              case GDK_KEY_F18:
                code = 32;
                break;
              case GDK_KEY_F19:
                code = 33;
                break;
              case GDK_KEY_F20:
                code = 34;
                break;
            }
            if (!(event->state & GDK_CONTROL_MASK)) switch (event->keyval) {
              case GDK_KEY_Home: case GDK_KEY_KP_Home:
                code = 1;
                break;
              case GDK_KEY_Insert: case GDK_KEY_KP_Insert:
                code = 2;
                break;
              case GDK_KEY_Delete: case GDK_KEY_KP_Delete:
                code = 3;
                break;
              case GDK_KEY_End: case GDK_KEY_KP_End:
                code = 4;
                break;
              case GDK_KEY_Page_Up: case GDK_KEY_KP_Page_Up:
                code = 5;
                break;
              case GDK_KEY_Page_Down: case GDK_KEY_KP_Page_Down:
                code = 6;
                break;
            }
            /* Reorder edit keys to physical order */
            if (funky_type == FUNKY_VT400 && code <= 6)
                code = "\0\2\1\4\5\3\6"[code];

            if (inst->term->vt52_mode && code > 0 && code <= 6) {
                end = 1 + sprintf(output+1, "\x1B%c", " HLMEIG"[code]);
                use_ucsoutput = FALSE;
                goto done;
            }

            if (funky_type == FUNKY_SCO &&     /* SCO function keys */
                code >= 11 && code <= 34) {
                char codes[] = "MNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz@[\\]^_`{";
                int index = 0;
                switch (event->keyval) {
                  case GDK_KEY_F1: index = 0; break;
                  case GDK_KEY_F2: index = 1; break;
                  case GDK_KEY_F3: index = 2; break;
                  case GDK_KEY_F4: index = 3; break;
                  case GDK_KEY_F5: index = 4; break;
                  case GDK_KEY_F6: index = 5; break;
                  case GDK_KEY_F7: index = 6; break;
                  case GDK_KEY_F8: index = 7; break;
                  case GDK_KEY_F9: index = 8; break;
                  case GDK_KEY_F10: index = 9; break;
                  case GDK_KEY_F11: index = 10; break;
                  case GDK_KEY_F12: index = 11; break;
                }
                if (event->state & GDK_SHIFT_MASK) index += 12;
                if (event->state & GDK_CONTROL_MASK) index += 24;
                end = 1 + sprintf(output+1, "\x1B[%c", codes[index]);
                use_ucsoutput = FALSE;
                goto done;
            }
            if (funky_type == FUNKY_SCO &&     /* SCO small keypad */
                code >= 1 && code <= 6) {
                char codes[] = "HL.FIG";
                if (code == 3) {
                    output[1] = '\x7F';
                    end = 2;
                } else {
                    end = 1 + sprintf(output+1, "\x1B[%c", codes[code-1]);
                }
                use_ucsoutput = FALSE;
                goto done;
            }
            if ((inst->term->vt52_mode || funky_type == FUNKY_VT100P) &&
                code >= 11 && code <= 24) {
                int offt = 0;
                if (code > 15)
                    offt++;
                if (code > 21)
                    offt++;
                if (inst->term->vt52_mode)
                    end = 1 + sprintf(output+1,
                                      "\x1B%c", code + 'P' - 11 - offt);
                else
                    end = 1 + sprintf(output+1,
                                      "\x1BO%c", code + 'P' - 11 - offt);
                use_ucsoutput = FALSE;
                goto done;
            }
            if (funky_type == FUNKY_LINUX && code >= 11 && code <= 15) {
                end = 1 + sprintf(output+1, "\x1B[[%c", code + 'A' - 11);
                use_ucsoutput = FALSE;
                goto done;
            }
            if (funky_type == FUNKY_XTERM && code >= 11 && code <= 14) {
                if (inst->term->vt52_mode)
                    end = 1 + sprintf(output+1, "\x1B%c", code + 'P' - 11);
                else
                    end = 1 + sprintf(output+1, "\x1BO%c", code + 'P' - 11);
                use_ucsoutput = FALSE;
                goto done;
            }
            if ((code == 1 || code == 4) &&
                conf_get_int(inst->conf, CONF_rxvt_homeend)) {
                end = 1 + sprintf(output+1, code == 1 ? "\x1B[H" : "\x1BOw");
                use_ucsoutput = FALSE;
                goto done;
            }
            if (code) {
                end = 1 + sprintf(output+1, "\x1B[%d~", code);
                use_ucsoutput = FALSE;
                goto done;
            }
        }

        /*
         * Cursor keys. (This includes the numberpad cursor keys,
         * if we haven't already done them due to app keypad mode.)
         * 
         * Here we also process un-numlocked un-appkeypadded KP5,
         * which sends ESC [ G.
         */
        {
            int xkey = 0;
            switch (event->keyval) {
              case GDK_KEY_Up: case GDK_KEY_KP_Up: xkey = 'A'; break;
              case GDK_KEY_Down: case GDK_KEY_KP_Down: xkey = 'B'; break;
              case GDK_KEY_Right: case GDK_KEY_KP_Right: xkey = 'C'; break;
              case GDK_KEY_Left: case GDK_KEY_KP_Left: xkey = 'D'; break;
              case GDK_KEY_Begin: case GDK_KEY_KP_Begin: xkey = 'G'; break;
            }
            if (xkey) {
                end = 1 + format_arrow_key(output+1, inst->term, xkey,
                                           event->state & GDK_CONTROL_MASK);
                use_ucsoutput = FALSE;
                goto done;
            }
        }
        goto done;
    }

    done:

    if (end-start > 0) {
#ifdef KEY_DEBUGGING
        int i;
        printf("generating sequence:");
        for (i = start; i < end; i++)
            printf(" %02x", (unsigned char) output[i]);
        printf("\n");
#endif

        if (special) {
            /*
             * For special control characters, the character set
             * should never matter.
             */
            output[end] = '\0';        /* NUL-terminate */
            if (inst->ldisc)
                ldisc_send(inst->ldisc, output+start, -2, 1);
        } else if (!inst->direct_to_font) {
            if (!use_ucsoutput) {
                if (inst->ldisc)
                    lpage_send(inst->ldisc, output_charset, output+start,
                               end-start, 1);
            } else {
                /*
                 * We generated our own Unicode key data from the
                 * keysym, so use that instead.
                 */
                if (inst->ldisc)
                    luni_send(inst->ldisc, ucsoutput+start, end-start, 1);
            }
        } else {
            /*
             * In direct-to-font mode, we just send the string
             * exactly as we received it.
             */
            if (inst->ldisc)
                ldisc_send(inst->ldisc, output+start, end-start, 1);
        }

        show_mouseptr(inst, 0);
        term_seen_key_event(inst->term);
    }

    return TRUE;
}

#if GTK_CHECK_VERSION(2,0,0)
void input_method_commit_event(GtkIMContext *imc, gchar *str, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    if (inst->ldisc)
        lpage_send(inst->ldisc, CS_UTF8, str, strlen(str), 1);
    show_mouseptr(inst, 0);
    term_seen_key_event(inst->term);
}
#endif

gboolean button_internal(struct gui_data *inst, guint32 timestamp,
                         GdkEventType type, guint ebutton, guint state,
                         gdouble ex, gdouble ey)
{
    int shift, ctrl, alt, x, y, button, act, raw_mouse_mode;

    /* Remember the timestamp. */
    inst->input_event_time = timestamp;

    show_mouseptr(inst, 1);

    shift = state & GDK_SHIFT_MASK;
    ctrl = state & GDK_CONTROL_MASK;
    alt = state & GDK_MOD1_MASK;

    raw_mouse_mode =
        send_raw_mouse && !(shift && conf_get_int(inst->conf,
                                                  CONF_mouse_override));

    if (!raw_mouse_mode) {
        if (ebutton == 4 && type == GDK_BUTTON_PRESS) {
            term_scroll(inst->term, 0, -5);
            return TRUE;
        }
        if (ebutton == 5 && type == GDK_BUTTON_PRESS) {
            term_scroll(inst->term, 0, +5);
            return TRUE;
        }
    }

    if (ebutton == 3 && ctrl) {
        gtk_menu_popup(GTK_MENU(inst->menu), NULL, NULL, NULL, NULL,
                       ebutton, timestamp);
        return TRUE;
    }

    if (ebutton == 1)
        button = MBT_LEFT;
    else if (ebutton == 2)
        button = MBT_MIDDLE;
    else if (ebutton == 3)
        button = MBT_RIGHT;
    else if (ebutton == 4)
        button = MBT_WHEEL_UP;
    else if (ebutton == 5)
        button = MBT_WHEEL_DOWN;
    else
        return FALSE;                  /* don't even know what button! */

    switch (type) {
      case GDK_BUTTON_PRESS: act = MA_CLICK; break;
      case GDK_BUTTON_RELEASE: act = MA_RELEASE; break;
      case GDK_2BUTTON_PRESS: act = MA_2CLK; break;
      case GDK_3BUTTON_PRESS: act = MA_3CLK; break;
      default: return FALSE;           /* don't know this event type */
    }

    if (raw_mouse_mode && act != MA_CLICK && act != MA_RELEASE)
        return TRUE;                   /* we ignore these in raw mouse mode */

    x = (ex - inst->window_border) / inst->font_width;
    y = (ey - inst->window_border) / inst->font_height;

    term_mouse(inst->term, button, translate_button(button), act,
               x, y, shift, ctrl, alt);

    return TRUE;
}

gboolean button_event(GtkWidget *widget, GdkEventButton *event, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    return button_internal(inst, event->time, event->type, event->button,
                           event->state, event->x, event->y);
}

#if GTK_CHECK_VERSION(2,0,0)
/*
 * In GTK 2, mouse wheel events have become a new type of event.
 * This handler translates them back into button-4 and button-5
 * presses so that I don't have to change my old code too much :-)
 */
gboolean scroll_event(GtkWidget *widget, GdkEventScroll *event, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    guint button;

    if (event->direction == GDK_SCROLL_UP)
        button = 4;
    else if (event->direction == GDK_SCROLL_DOWN)
        button = 5;
    else
        return FALSE;

    return button_internal(inst, event->time, GDK_BUTTON_PRESS,
                           button, event->state, event->x, event->y);
}
#endif

gint motion_event(GtkWidget *widget, GdkEventMotion *event, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    int shift, ctrl, alt, x, y, button;

    /* Remember the timestamp. */
    inst->input_event_time = event->time;

    show_mouseptr(inst, 1);

    shift = event->state & GDK_SHIFT_MASK;
    ctrl = event->state & GDK_CONTROL_MASK;
    alt = event->state & GDK_MOD1_MASK;
    if (event->state & GDK_BUTTON1_MASK)
        button = MBT_LEFT;
    else if (event->state & GDK_BUTTON2_MASK)
        button = MBT_MIDDLE;
    else if (event->state & GDK_BUTTON3_MASK)
        button = MBT_RIGHT;
    else
        return FALSE;                  /* don't even know what button! */

    x = (event->x - inst->window_border) / inst->font_width;
    y = (event->y - inst->window_border) / inst->font_height;

    term_mouse(inst->term, button, translate_button(button), MA_DRAG,
               x, y, shift, ctrl, alt);

    return TRUE;
}

void frontend_keypress(void *handle)
{
    struct gui_data *inst = (struct gui_data *)handle;

    /*
     * If our child process has exited but not closed, terminate on
     * any keypress.
     */
    if (inst->exited)
        cleanup_exit(0);
}

static void exit_callback(void *vinst)
{
    struct gui_data *inst = (struct gui_data *)vinst;
    int exitcode, close_on_exit;

    if (!inst->exited &&
        (exitcode = inst->back->exitcode(inst->backhandle)) >= 0) {
        inst->exited = TRUE;
        close_on_exit = conf_get_int(inst->conf, CONF_close_on_exit);
        if (close_on_exit == FORCE_ON ||
            (close_on_exit == AUTO && exitcode == 0))
            gtk_main_quit();           /* just go */
        if (inst->ldisc) {
            ldisc_free(inst->ldisc);
            inst->ldisc = NULL;
        }
        inst->back->free(inst->backhandle);
        inst->backhandle = NULL;
        inst->back = NULL;
        term_provide_resize_fn(inst->term, NULL, NULL);
        update_specials_menu(inst);
        gtk_widget_set_sensitive(inst->restartitem, TRUE);
    }
}

/*
 * Replacement code for the gtk_quit_add() function, which GTK2 - in
 * their unbounded wisdom - deprecated without providing any usable
 * replacement, and which we were using to ensure that our idle
 * function for toplevel callbacks was only run from the outermost
 * gtk_main().
 *
 * We maintain a global variable with a list of 'struct gui_data'
 * instances on which we should call inst_post_main() when a
 * subsidiary gtk_main() terminates; then we must make sure that all
 * our subsidiary calls to gtk_main() are followed by a call to
 * post_main().
 *
 * This is kind of overkill in the sense that at the time of writing
 * we don't actually ever run more than one 'struct gui_data' instance
 * in the same process, but we're _so nearly_ prepared to do that that
 * I want to remain futureproof against the possibility of doing so in
 * future.
 */
struct post_main_context {
    struct post_main_context *next;
    struct gui_data *inst;
};
struct post_main_context *post_main_list_head = NULL;
static void request_post_main(struct gui_data *inst)
{
    struct post_main_context *node = snew(struct post_main_context);
    node->next = post_main_list_head;
    node->inst = inst;
    post_main_list_head = node;
}
static void inst_post_main(struct gui_data *inst);
void post_main(void)
{
    while (post_main_list_head) {
        struct post_main_context *node = post_main_list_head;
        post_main_list_head = node->next;
        inst_post_main(node->inst);
        sfree(node);
    }
}

void notify_remote_exit(void *frontend)
{
    struct gui_data *inst = (struct gui_data *)frontend;

    queue_toplevel_callback(exit_callback, inst);
}

static void notify_toplevel_callback(void *frontend);

static void inst_post_main(struct gui_data *inst)
{
    if (gtk_main_level() == 1) {
        notify_toplevel_callback(inst);
        inst->quit_fn_scheduled = FALSE;
    } else {
        /* Apparently we're _still_ more than one level deep in
         * gtk_main() instances, so we'll need another callback for
         * when we get out of the next one. */
        request_post_main(inst);
    }
}

static gint idle_toplevel_callback_func(gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;

    if (gtk_main_level() > 1) {
        /*
         * We don't run the callbacks if we're in the middle of a
         * subsidiary gtk_main. Instead, ask for a callback when we
         * get back out of the subsidiary main loop (if we haven't
         * already arranged one), so we can reschedule ourself then.
         */
        if (!inst->quit_fn_scheduled) {
            request_post_main(inst);
            inst->quit_fn_scheduled = TRUE;
        }
        /*
         * And unschedule this idle function, since we've now done
         * everything we can until the innermost gtk_main has quit and
         * can reschedule us with a chance of actually taking action.
         */
        if (inst->idle_fn_scheduled) { /* double-check, just in case */
            g_source_remove(inst->toplevel_callback_idle_id);
            inst->idle_fn_scheduled = FALSE;
        }
    } else {
        run_toplevel_callbacks();
    }

    /*
     * If we've emptied our toplevel callback queue, unschedule
     * ourself. Otherwise, leave ourselves pending so we'll be called
     * again to deal with more callbacks after another round of the
     * event loop.
     */
    if (!toplevel_callback_pending() && inst->idle_fn_scheduled) {
        g_source_remove(inst->toplevel_callback_idle_id);
        inst->idle_fn_scheduled = FALSE;
    }

    return TRUE;
}

static void notify_toplevel_callback(void *frontend)
{
    struct gui_data *inst = (struct gui_data *)frontend;

    if (!inst->idle_fn_scheduled) {
        inst->toplevel_callback_idle_id =
            g_idle_add(idle_toplevel_callback_func, inst);
        inst->idle_fn_scheduled = TRUE;
    }
}

static gint timer_trigger(gpointer data)
{
    unsigned long now = GPOINTER_TO_LONG(data);
    unsigned long next, then;
    long ticks;

    /*
     * Destroy the timer we got here on.
     */
    if (timer_id) {
        g_source_remove(timer_id);
        timer_id = 0;
    }

    /*
     * run_timers() may cause a call to timer_change_notify, in which
     * case a new timer will already have been set up and left in
     * timer_id. If it hasn't, and run_timers reports that some timing
     * still needs to be done, we do it ourselves.
     */
    if (run_timers(now, &next) && !timer_id) {
        then = now;
        now = GETTICKCOUNT();
        if (now - then > next - then)
            ticks = 0;
        else
            ticks = next - now;
        timer_id = g_timeout_add(ticks, timer_trigger, LONG_TO_GPOINTER(next));
    }

    /*
     * Returning FALSE means 'don't call this timer again', which
     * _should_ be redundant given that we removed it above, but just
     * in case, return FALSE anyway.
     */
    return FALSE;
}

void timer_change_notify(unsigned long next)
{
    long ticks;

    if (timer_id)
        g_source_remove(timer_id);

    ticks = next - GETTICKCOUNT();
    if (ticks <= 0)
        ticks = 1;                     /* just in case */

    timer_id = g_timeout_add(ticks, timer_trigger, LONG_TO_GPOINTER(next));
}

void fd_input_func(gpointer data, gint sourcefd, GdkInputCondition condition)
{
    /*
     * We must process exceptional notifications before ordinary
     * readability ones, or we may go straight past the urgent
     * marker.
     */
    if (condition & GDK_INPUT_EXCEPTION)
        select_result(sourcefd, 4);
    if (condition & GDK_INPUT_READ)
        select_result(sourcefd, 1);
    if (condition & GDK_INPUT_WRITE)
        select_result(sourcefd, 2);
}

void destroy(GtkWidget *widget, gpointer data)
{
    gtk_main_quit();
}

gint focus_event(GtkWidget *widget, GdkEventFocus *event, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    term_set_focus(inst->term, event->in);
    term_update(inst->term);
    show_mouseptr(inst, 1);
    return FALSE;
}

void set_busy_status(void *frontend, int status)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    inst->busy_status = status;
    update_mouseptr(inst);
}

/*
 * set or clear the "raw mouse message" mode
 */
void set_raw_mouse_mode(void *frontend, int activate)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    activate = activate && !conf_get_int(inst->conf, CONF_no_mouse_rep);
    send_raw_mouse = activate;
    update_mouseptr(inst);
}

void request_resize(void *frontend, int w, int h)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    int large_x, large_y;
    int offset_x, offset_y;
    int area_x, area_y;
    GtkRequisition inner, outer;

    /*
     * This is a heinous hack dreamed up by the gnome-terminal
     * people to get around a limitation in gtk. The problem is
     * that in order to set the size correctly we really need to be
     * calling gtk_window_resize - but that needs to know the size
     * of the _whole window_, not the drawing area. So what we do
     * is to set an artificially huge size request on the drawing
     * area, recompute the resulting size request on the window,
     * and look at the difference between the two. That gives us
     * the x and y offsets we need to translate drawing area size
     * into window size for real, and then we call
     * gtk_window_resize.
     */

    /*
     * We start by retrieving the current size of the whole window.
     * Adding a bit to _that_ will give us a value we can use as a
     * bogus size request which guarantees to be bigger than the
     * current size of the drawing area.
     */
    get_window_pixels(inst, &large_x, &large_y);
    large_x += 32;
    large_y += 32;

    gtk_widget_set_size_request(inst->area, large_x, large_y);
    gtk_widget_size_request(inst->area, &inner);
    gtk_widget_size_request(inst->window, &outer);

    offset_x = outer.width - inner.width;
    offset_y = outer.height - inner.height;

    area_x = inst->font_width * w + 2*inst->window_border;
    area_y = inst->font_height * h + 2*inst->window_border;

    /*
     * Now we must set the size request on the drawing area back to
     * something sensible before we commit the real resize. Best
     * way to do this, I think, is to set it to what the size is
     * really going to end up being.
     */
    gtk_widget_set_size_request(inst->area, area_x, area_y);
#if GTK_CHECK_VERSION(2,0,0)
    gtk_window_resize(GTK_WINDOW(inst->window),
                      area_x + offset_x, area_y + offset_y);
#else
    gtk_drawing_area_size(GTK_DRAWING_AREA(inst->area), area_x, area_y);
    /*
     * I can no longer remember what this call to
     * gtk_container_dequeue_resize_handler is for. It was
     * introduced in r3092 with no comment, and the commit log
     * message was uninformative. I'm _guessing_ its purpose is to
     * prevent gratuitous resize processing on the window given
     * that we're about to resize it anyway, but I have no idea
     * why that's so incredibly vital.
     * 
     * I've tried removing the call, and nothing seems to go
     * wrong. I've backtracked to r3092 and tried removing the
     * call there, and still nothing goes wrong. So I'm going to
     * adopt the working hypothesis that it's superfluous; I won't
     * actually remove it from the GTK 1.2 code, but I won't
     * attempt to replicate its functionality in the GTK 2 code
     * above.
     */
    gtk_container_dequeue_resize_handler(GTK_CONTAINER(inst->window));
    gdk_window_resize(gtk_widget_get_window(inst->window),
                      area_x + offset_x, area_y + offset_y);
#endif
}

static void real_palette_set(struct gui_data *inst, int n, int r, int g, int b)
{
    gboolean success[1];

    inst->cols[n].red = r * 0x0101;
    inst->cols[n].green = g * 0x0101;
    inst->cols[n].blue = b * 0x0101;

    gdk_colormap_free_colors(inst->colmap, inst->cols + n, 1);
    gdk_colormap_alloc_colors(inst->colmap, inst->cols + n, 1,
                              FALSE, TRUE, success);
    if (!success[0])
        g_error("%s: couldn't allocate colour %d (#%02x%02x%02x)\n", appname,
                n, r, g, b);
}

void set_window_background(struct gui_data *inst)
{
    if (inst->area && gtk_widget_get_window(inst->area))
        gdk_window_set_background(gtk_widget_get_window(inst->area),
                                  &inst->cols[258]);
    if (inst->window && gtk_widget_get_window(inst->window))
        gdk_window_set_background(gtk_widget_get_window(inst->window),
                                  &inst->cols[258]);
}

void palette_set(void *frontend, int n, int r, int g, int b)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    if (n >= 16)
        n += 256 - 16;
    if (n >= NALLCOLOURS)
        return;
    real_palette_set(inst, n, r, g, b);
    if (n == 258) {
        /* Default Background changed. Ensure space between text area and
         * window border is redrawn */
        set_window_background(inst);
        draw_backing_rect(inst);
        gtk_widget_queue_draw(inst->area);
    }
}

void palette_reset(void *frontend)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    /* This maps colour indices in inst->conf to those used in inst->cols. */
    static const int ww[] = {
        256, 257, 258, 259, 260, 261,
        0, 8, 1, 9, 2, 10, 3, 11,
        4, 12, 5, 13, 6, 14, 7, 15
    };
    gboolean success[NALLCOLOURS];
    int i;

    assert(lenof(ww) == NCFGCOLOURS);

    if (!inst->colmap) {
        inst->colmap = gdk_colormap_get_system();
    } else {
        gdk_colormap_free_colors(inst->colmap, inst->cols, NALLCOLOURS);
    }

    for (i = 0; i < NCFGCOLOURS; i++) {
        inst->cols[ww[i]].red =
            conf_get_int_int(inst->conf, CONF_colours, i*3+0) * 0x0101;
        inst->cols[ww[i]].green =
            conf_get_int_int(inst->conf, CONF_colours, i*3+1) * 0x0101;
        inst->cols[ww[i]].blue = 
            conf_get_int_int(inst->conf, CONF_colours, i*3+2) * 0x0101;
    }

    for (i = 0; i < NEXTCOLOURS; i++) {
        if (i < 216) {
            int r = i / 36, g = (i / 6) % 6, b = i % 6;
            inst->cols[i+16].red = r ? r * 0x2828 + 0x3737 : 0;
            inst->cols[i+16].green = g ? g * 0x2828 + 0x3737 : 0;
            inst->cols[i+16].blue = b ? b * 0x2828 + 0x3737 : 0;
        } else {
            int shade = i - 216;
            shade = shade * 0x0a0a + 0x0808;
            inst->cols[i+16].red = inst->cols[i+16].green =
                inst->cols[i+16].blue = shade;
        }
    }

    gdk_colormap_alloc_colors(inst->colmap, inst->cols, NALLCOLOURS,
                              FALSE, TRUE, success);
    for (i = 0; i < NALLCOLOURS; i++) {
        if (!success[i])
            g_error("%s: couldn't allocate colour %d (#%02x%02x%02x)\n",
                    appname, i,
                    conf_get_int_int(inst->conf, CONF_colours, i*3+0),
                    conf_get_int_int(inst->conf, CONF_colours, i*3+1),
                    conf_get_int_int(inst->conf, CONF_colours, i*3+2));
    }

    /* Since Default Background may have changed, ensure that space
     * between text area and window border is refreshed. */
    set_window_background(inst);
    if (inst->area && gtk_widget_get_window(inst->area)) {
        draw_backing_rect(inst);
        gtk_widget_queue_draw(inst->area);
    }
}

/* Ensure that all the cut buffers exist - according to the ICCCM, we must
 * do this before we start using cut buffers.
 */
void init_cutbuffers()
{
#ifndef NOT_X_WINDOWS
    unsigned char empty[] = "";
    Display *disp = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
    XChangeProperty(disp, GDK_ROOT_WINDOW(),
                    XA_CUT_BUFFER0, XA_STRING, 8, PropModeAppend, empty, 0);
    XChangeProperty(disp, GDK_ROOT_WINDOW(),
                    XA_CUT_BUFFER1, XA_STRING, 8, PropModeAppend, empty, 0);
    XChangeProperty(disp, GDK_ROOT_WINDOW(),
                    XA_CUT_BUFFER2, XA_STRING, 8, PropModeAppend, empty, 0);
    XChangeProperty(disp, GDK_ROOT_WINDOW(),
                    XA_CUT_BUFFER3, XA_STRING, 8, PropModeAppend, empty, 0);
    XChangeProperty(disp, GDK_ROOT_WINDOW(),
                    XA_CUT_BUFFER4, XA_STRING, 8, PropModeAppend, empty, 0);
    XChangeProperty(disp, GDK_ROOT_WINDOW(),
                    XA_CUT_BUFFER5, XA_STRING, 8, PropModeAppend, empty, 0);
    XChangeProperty(disp, GDK_ROOT_WINDOW(),
                    XA_CUT_BUFFER6, XA_STRING, 8, PropModeAppend, empty, 0);
    XChangeProperty(disp, GDK_ROOT_WINDOW(),
                    XA_CUT_BUFFER7, XA_STRING, 8, PropModeAppend, empty, 0);
#endif
}

/* Store the data in a cut-buffer. */
void store_cutbuffer(char * ptr, int len)
{
#ifndef NOT_X_WINDOWS
    Display *disp = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
    /* ICCCM says we must rotate the buffers before storing to buffer 0. */
    XRotateBuffers(disp, 1);
    XStoreBytes(disp, ptr, len);
#endif
}

/* Retrieve data from a cut-buffer.
 * Returned data needs to be freed with XFree().
 */
char * retrieve_cutbuffer(int * nbytes)
{
#ifndef NOT_X_WINDOWS
    Display *disp = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
    char * ptr;
    ptr = XFetchBytes(disp, nbytes);
    if (*nbytes <= 0 && ptr != 0) {
        XFree(ptr);
        ptr = 0;
    }
    return ptr;
#else
    return NULL;
#endif
}

void write_clip(void *frontend, wchar_t * data, int *attr, int len, int must_deselect)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    if (inst->pasteout_data)
        sfree(inst->pasteout_data);
    if (inst->pasteout_data_ctext)
        sfree(inst->pasteout_data_ctext);
    if (inst->pasteout_data_utf8)
        sfree(inst->pasteout_data_utf8);

    /*
     * Set up UTF-8 and compound text paste data. This only happens
     * if we aren't in direct-to-font mode using the D800 hack.
     */
    if (!inst->direct_to_font) {
        const wchar_t *tmp = data;
        int tmplen = len;
#ifndef NOT_X_WINDOWS
        XTextProperty tp;
        char *list[1];
        Display *disp = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
#endif

        inst->pasteout_data_utf8 = snewn(len*6, char);
        inst->pasteout_data_utf8_len = len*6;
        inst->pasteout_data_utf8_len =
            charset_from_unicode(&tmp, &tmplen, inst->pasteout_data_utf8,
                                 inst->pasteout_data_utf8_len,
                                 CS_UTF8, NULL, NULL, 0);
        if (inst->pasteout_data_utf8_len == 0) {
            sfree(inst->pasteout_data_utf8);
            inst->pasteout_data_utf8 = NULL;
        } else {
            inst->pasteout_data_utf8 =
                sresize(inst->pasteout_data_utf8,
                        inst->pasteout_data_utf8_len + 1, char);
            inst->pasteout_data_utf8[inst->pasteout_data_utf8_len] = '\0';
        }

        /*
         * Now let Xlib convert our UTF-8 data into compound text.
         */
#ifndef NOT_X_WINDOWS
        list[0] = inst->pasteout_data_utf8;
        if (Xutf8TextListToTextProperty(disp, list, 1,
                                        XCompoundTextStyle, &tp) == 0) {
            inst->pasteout_data_ctext = snewn(tp.nitems+1, char);
            memcpy(inst->pasteout_data_ctext, tp.value, tp.nitems);
            inst->pasteout_data_ctext_len = tp.nitems;
            XFree(tp.value);
        } else
#endif
        {
            inst->pasteout_data_ctext = NULL;
            inst->pasteout_data_ctext_len = 0;
        }
    } else {
        inst->pasteout_data_utf8 = NULL;
        inst->pasteout_data_utf8_len = 0;
        inst->pasteout_data_ctext = NULL;
        inst->pasteout_data_ctext_len = 0;
    }

    inst->pasteout_data = snewn(len*6, char);
    inst->pasteout_data_len = len*6;
    inst->pasteout_data_len = wc_to_mb(inst->ucsdata.line_codepage, 0,
                                       data, len, inst->pasteout_data,
                                       inst->pasteout_data_len,
                                       NULL, NULL, NULL);
    if (inst->pasteout_data_len == 0) {
        sfree(inst->pasteout_data);
        inst->pasteout_data = NULL;
    } else {
        inst->pasteout_data =
            sresize(inst->pasteout_data, inst->pasteout_data_len, char);
    }

    store_cutbuffer(inst->pasteout_data, inst->pasteout_data_len);

    if (gtk_selection_owner_set(inst->area, GDK_SELECTION_PRIMARY,
                                inst->input_event_time)) {
#if GTK_CHECK_VERSION(2,0,0)
        gtk_selection_clear_targets(inst->area, GDK_SELECTION_PRIMARY);
#endif
        gtk_selection_add_target(inst->area, GDK_SELECTION_PRIMARY,
                                 GDK_SELECTION_TYPE_STRING, 1);
        if (inst->pasteout_data_ctext)
            gtk_selection_add_target(inst->area, GDK_SELECTION_PRIMARY,
                                     compound_text_atom, 1);
        if (inst->pasteout_data_utf8)
            gtk_selection_add_target(inst->area, GDK_SELECTION_PRIMARY,
                                     utf8_string_atom, 1);
    }

    if (must_deselect)
        term_deselect(inst->term);
}

void selection_get(GtkWidget *widget, GtkSelectionData *seldata,
                   guint info, guint time_stamp, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    GdkAtom target = gtk_selection_data_get_target(seldata);
    if (target == utf8_string_atom)
        gtk_selection_data_set(seldata, target, 8,
                               (unsigned char *)inst->pasteout_data_utf8,
                               inst->pasteout_data_utf8_len);
    else if (target == compound_text_atom)
        gtk_selection_data_set(seldata, target, 8,
                               (unsigned char *)inst->pasteout_data_ctext,
                               inst->pasteout_data_ctext_len);
    else
        gtk_selection_data_set(seldata, target, 8,
                               (unsigned char *)inst->pasteout_data,
                               inst->pasteout_data_len);
}

gint selection_clear(GtkWidget *widget, GdkEventSelection *seldata,
                     gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;

    term_deselect(inst->term);
    if (inst->pasteout_data)
        sfree(inst->pasteout_data);
    if (inst->pasteout_data_ctext)
        sfree(inst->pasteout_data_ctext);
    if (inst->pasteout_data_utf8)
        sfree(inst->pasteout_data_utf8);
    inst->pasteout_data = NULL;
    inst->pasteout_data_len = 0;
    inst->pasteout_data_ctext = NULL;
    inst->pasteout_data_ctext_len = 0;
    inst->pasteout_data_utf8 = NULL;
    inst->pasteout_data_utf8_len = 0;
    return TRUE;
}

void request_paste(void *frontend)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    /*
     * In Unix, pasting is asynchronous: all we can do at the
     * moment is to call gtk_selection_convert(), and when the data
     * comes back _then_ we can call term_do_paste().
     */

    if (!inst->direct_to_font) {
        /*
         * First we attempt to retrieve the selection as a UTF-8
         * string (which we will convert to the correct code page
         * before sending to the session, of course). If that
         * fails, selection_received() will be informed and will
         * fall back to an ordinary string.
         */
        gtk_selection_convert(inst->area, GDK_SELECTION_PRIMARY,
                              utf8_string_atom,
                              inst->input_event_time);
    } else {
        /*
         * If we're in direct-to-font mode, we disable UTF-8
         * pasting, and go straight to ordinary string data.
         */
        gtk_selection_convert(inst->area, GDK_SELECTION_PRIMARY,
                              GDK_SELECTION_TYPE_STRING,
                              inst->input_event_time);
    }
}

gint idle_paste_func(gpointer data);   /* forward ref */

void selection_received(GtkWidget *widget, GtkSelectionData *seldata,
                        guint time, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    char *text;
    int length;
#ifndef NOT_X_WINDOWS
    char **list;
    int free_list_required = 0;
    int free_required = 0;
#endif
    int charset;
    GdkAtom seldata_target = gtk_selection_data_get_target(seldata);
    GdkAtom seldata_type = gtk_selection_data_get_data_type(seldata);
    const guchar *seldata_data = gtk_selection_data_get_data(seldata);
    gint seldata_length = gtk_selection_data_get_length(seldata);

    if (seldata_target == utf8_string_atom && seldata_length <= 0) {
        /*
         * Failed to get a UTF-8 selection string. Try compound
         * text next.
         */
        gtk_selection_convert(inst->area, GDK_SELECTION_PRIMARY,
                              compound_text_atom,
                              inst->input_event_time);
        return;
    }

    if (seldata_target == compound_text_atom && seldata_length <= 0) {
        /*
         * Failed to get UTF-8 or compound text. Try an ordinary
         * string.
         */
        gtk_selection_convert(inst->area, GDK_SELECTION_PRIMARY,
                              GDK_SELECTION_TYPE_STRING,
                              inst->input_event_time);
        return;
    }

    /*
     * If we have data, but it's not of a type we can deal with,
     * we have to ignore the data.
     */
    if (seldata_length > 0 &&
        seldata_type != GDK_SELECTION_TYPE_STRING &&
        seldata_type != compound_text_atom &&
        seldata_type != utf8_string_atom)
        return;

    /*
     * If we have no data, try looking in a cut buffer.
     */
    if (seldata_length <= 0) {
#ifndef NOT_X_WINDOWS
        text = retrieve_cutbuffer(&length);
        if (length == 0)
            return;
        /* Xterm is rumoured to expect Latin-1, though I havn't checked the
         * source, so use that as a de-facto standard. */
        charset = CS_ISO8859_1;
        free_required = 1;
#else
        return;
#endif
    } else {
        /*
         * Convert COMPOUND_TEXT into UTF-8.
         */
        if (seldata_type == compound_text_atom) {
#ifndef NOT_X_WINDOWS
            XTextProperty tp;
            int ret, count;
            Display *disp = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());

            tp.value = (unsigned char *)seldata_data;
            tp.encoding = (Atom) seldata_type;
            tp.format = gtk_selection_data_get_format(seldata);
            tp.nitems = seldata_length;
            ret = Xutf8TextPropertyToTextList(disp, &tp, &list, &count);
            if (ret == 0 && count == 1) {
                text = list[0];
                length = strlen(list[0]);
                charset = CS_UTF8;
                free_list_required = 1;
            } else
#endif
            {
                /*
                 * Compound text failed; fall back to STRING.
                 */
                gtk_selection_convert(inst->area, GDK_SELECTION_PRIMARY,
                                      GDK_SELECTION_TYPE_STRING,
                                      inst->input_event_time);
                return;
            }
        } else {
            text = (char *)seldata_data;
            length = seldata_length;
            charset = (seldata_type == utf8_string_atom ?
                       CS_UTF8 : inst->ucsdata.line_codepage);
        }
    }

    if (inst->pastein_data)
        sfree(inst->pastein_data);

    inst->pastein_data = snewn(length, wchar_t);
    inst->pastein_data_len = length;
    inst->pastein_data_len =
        mb_to_wc(charset, 0, text, length,
                 inst->pastein_data, inst->pastein_data_len);

    term_do_paste(inst->term);

#ifndef NOT_X_WINDOWS
    if (free_list_required)
        XFreeStringList(list);
    if (free_required)
        XFree(text);
#endif
}

void get_clip(void *frontend, wchar_t ** p, int *len)
{
    struct gui_data *inst = (struct gui_data *)frontend;

    if (p) {
        *p = inst->pastein_data;
        *len = inst->pastein_data_len;
    }
}

static void set_window_titles(struct gui_data *inst)
{
    /*
     * We must always call set_icon_name after calling set_title,
     * since set_title will write both names. Irritating, but such
     * is life.
     */
    gtk_window_set_title(GTK_WINDOW(inst->window), inst->wintitle);
    if (!conf_get_int(inst->conf, CONF_win_name_always))
        gdk_window_set_icon_name(gtk_widget_get_window(inst->window),
                                 inst->icontitle);
}

void set_title(void *frontend, char *title)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    sfree(inst->wintitle);
    inst->wintitle = dupstr(title);
    set_window_titles(inst);
}

void set_icon(void *frontend, char *title)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    sfree(inst->icontitle);
    inst->icontitle = dupstr(title);
    set_window_titles(inst);
}

void set_title_and_icon(void *frontend, char *title, char *icon)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    sfree(inst->wintitle);
    inst->wintitle = dupstr(title);
    sfree(inst->icontitle);
    inst->icontitle = dupstr(icon);
    set_window_titles(inst);
}

void set_sbar(void *frontend, int total, int start, int page)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    if (!conf_get_int(inst->conf, CONF_scrollbar))
        return;
    gtk_adjustment_set_lower(inst->sbar_adjust, 0);
    gtk_adjustment_set_upper(inst->sbar_adjust, total);
    gtk_adjustment_set_value(inst->sbar_adjust, start);
    gtk_adjustment_set_page_size(inst->sbar_adjust, page);
    gtk_adjustment_set_step_increment(inst->sbar_adjust, 1);
    gtk_adjustment_set_page_increment(inst->sbar_adjust, page/2);
    inst->ignore_sbar = TRUE;
    gtk_adjustment_changed(inst->sbar_adjust);
    inst->ignore_sbar = FALSE;
}

void scrollbar_moved(GtkAdjustment *adj, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;

    if (!conf_get_int(inst->conf, CONF_scrollbar))
        return;
    if (!inst->ignore_sbar)
        term_scroll(inst->term, 1, (int)gtk_adjustment_get_value(adj));
}

void sys_cursor(void *frontend, int x, int y)
{
    /*
     * This is meaningless under X.
     */
}

/*
 * This is still called when mode==BELL_VISUAL, even though the
 * visual bell is handled entirely within terminal.c, because we
 * may want to perform additional actions on any kind of bell (for
 * example, taskbar flashing in Windows).
 */
void do_beep(void *frontend, int mode)
{
    if (mode == BELL_DEFAULT)
        gdk_beep();
}

int char_width(Context ctx, int uc)
{
    /*
     * Under X, any fixed-width font really _is_ fixed-width.
     * Double-width characters will be dealt with using a separate
     * font. For the moment we can simply return 1.
     * 
     * FIXME: but is that also true of Pango?
     */
    return 1;
}

Context get_ctx(void *frontend)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    struct draw_ctx *dctx;
    GdkWindow *target;

    if (!gtk_widget_get_window(inst->area))
        return NULL;

#ifndef NO_BACKING_PIXMAPS
    target = inst->pixmap;
#else
    target = gtk_widget_get_window(inst->area);
#endif

    dctx = snew(struct draw_ctx);
    dctx->inst = inst;
    dctx->uctx.type = inst->drawtype;
#ifdef DRAW_TEXT_GDK
    if (dctx->uctx.type == DRAWTYPE_GDK) {
        dctx->uctx.u.gdk.target = target;
        dctx->uctx.u.gdk.gc = gdk_gc_new(gtk_widget_get_window(inst->area));
    }
#endif
#ifdef DRAW_TEXT_CAIRO
    if (dctx->uctx.type == DRAWTYPE_CAIRO) {
        dctx->uctx.u.cairo.widget = GTK_WIDGET(inst->area);
        dctx->uctx.u.cairo.cr = gdk_cairo_create(target);
        cairo_get_matrix(dctx->uctx.u.cairo.cr,
                         &dctx->uctx.u.cairo.origmatrix);
        cairo_set_line_width(dctx->uctx.u.cairo.cr, 1.0);
        cairo_set_line_cap(dctx->uctx.u.cairo.cr, CAIRO_LINE_CAP_SQUARE);
        cairo_set_line_join(dctx->uctx.u.cairo.cr, CAIRO_LINE_JOIN_MITER);
        /* This antialiasing setting appears to be ignored for Pango
         * font rendering but honoured for stroking and filling paths;
         * I don't quite understand the logic of that, but I won't
         * complain since it's exactly what I happen to want */
        cairo_set_antialias(dctx->uctx.u.cairo.cr, CAIRO_ANTIALIAS_NONE);
    }
#endif
    return dctx;
}

void free_ctx(Context ctx)
{
    struct draw_ctx *dctx = (struct draw_ctx *)ctx;
    /* struct gui_data *inst = dctx->inst; */
#ifdef DRAW_TEXT_GDK
    if (dctx->uctx.type == DRAWTYPE_GDK) {
        gdk_gc_unref(dctx->uctx.u.gdk.gc);
    }
#endif
#ifdef DRAW_TEXT_CAIRO
    if (dctx->uctx.type == DRAWTYPE_CAIRO) {
        cairo_destroy(dctx->uctx.u.cairo.cr);
    }
#endif
    sfree(dctx);
}


static void draw_update(struct draw_ctx *dctx, int x, int y, int w, int h)
{
#ifndef NO_BACKING_PIXMAPS
#ifdef DRAW_TEXT_GDK
    if (dctx->uctx.type == DRAWTYPE_GDK) {
        gdk_draw_pixmap(gtk_widget_get_window(dctx->inst->area),
                        dctx->uctx.u.gdk.gc, dctx->inst->pixmap,
                        x, y, x, y, w, h);
    }
#endif
#ifdef DRAW_TEXT_CAIRO /* FIXME: and not GTK3 where a cairo_t is all we have */
    if (dctx->uctx.type == DRAWTYPE_CAIRO) {
        GdkGC *gc = gdk_gc_new(gtk_widget_get_window(dctx->inst->area));
        gdk_draw_pixmap(gtk_widget_get_window(dctx->inst->area),
                        gc, dctx->inst->pixmap, x, y, x, y, w, h);
        gdk_gc_unref(gc);
    }
#endif
#endif
}

static void draw_set_colour(struct draw_ctx *dctx, int col)
{
#ifdef DRAW_TEXT_GDK
    if (dctx->uctx.type == DRAWTYPE_GDK) {
        gdk_gc_set_foreground(dctx->uctx.u.gdk.gc, &dctx->inst->cols[col]);
    }
#endif
#ifdef DRAW_TEXT_CAIRO
    if (dctx->uctx.type == DRAWTYPE_CAIRO) {
        cairo_set_source_rgb(dctx->uctx.u.cairo.cr,
                             dctx->inst->cols[col].red / 65535.0,
                             dctx->inst->cols[col].green / 65535.0,
                             dctx->inst->cols[col].blue / 65535.0);
    }
#endif
}

static void draw_rectangle(struct draw_ctx *dctx, int filled,
                           int x, int y, int w, int h)
{
#ifdef DRAW_TEXT_GDK
    if (dctx->uctx.type == DRAWTYPE_GDK) {
        gdk_draw_rectangle(dctx->uctx.u.gdk.target, dctx->uctx.u.gdk.gc,
                           filled, x, y, w, h);
    }
#endif
#ifdef DRAW_TEXT_CAIRO
    if (dctx->uctx.type == DRAWTYPE_CAIRO) {
        cairo_new_path(dctx->uctx.u.cairo.cr);
        if (filled) {
            cairo_rectangle(dctx->uctx.u.cairo.cr, x, y, w, h);
            cairo_fill(dctx->uctx.u.cairo.cr);
        } else {
            cairo_rectangle(dctx->uctx.u.cairo.cr,
                            x + 0.5, y + 0.5, w, h);
            cairo_close_path(dctx->uctx.u.cairo.cr);
            cairo_stroke(dctx->uctx.u.cairo.cr);
        }
    }
#endif
}

static void draw_clip(struct draw_ctx *dctx, int x, int y, int w, int h)
{
#ifdef DRAW_TEXT_GDK
    if (dctx->uctx.type == DRAWTYPE_GDK) {
        GdkRectangle r;

        r.x = x;
        r.y = y;
        r.width = w;
        r.height = h;

        gdk_gc_set_clip_rectangle(dctx->uctx.u.gdk.gc, &r);
    }
#endif
#ifdef DRAW_TEXT_CAIRO
    if (dctx->uctx.type == DRAWTYPE_CAIRO) {
        cairo_reset_clip(dctx->uctx.u.cairo.cr);
        cairo_new_path(dctx->uctx.u.cairo.cr);
        cairo_rectangle(dctx->uctx.u.cairo.cr, x, y, w, h);
        cairo_clip(dctx->uctx.u.cairo.cr);
    }
#endif
}

static void draw_point(struct draw_ctx *dctx, int x, int y)
{
#ifdef DRAW_TEXT_GDK
    if (dctx->uctx.type == DRAWTYPE_GDK) {
        gdk_draw_point(dctx->uctx.u.gdk.target, dctx->uctx.u.gdk.gc, x, y);
    }
#endif
#ifdef DRAW_TEXT_CAIRO
    if (dctx->uctx.type == DRAWTYPE_CAIRO) {
        cairo_new_path(dctx->uctx.u.cairo.cr);
        cairo_rectangle(dctx->uctx.u.cairo.cr, x, y, 1, 1);
        cairo_fill(dctx->uctx.u.cairo.cr);
    }
#endif
}

static void draw_line(struct draw_ctx *dctx, int x0, int y0, int x1, int y1)
{
#ifdef DRAW_TEXT_GDK
    if (dctx->uctx.type == DRAWTYPE_GDK) {
        gdk_draw_line(dctx->uctx.u.gdk.target, dctx->uctx.u.gdk.gc,
                      x0, y0, x1, y1);
    }
#endif
#ifdef DRAW_TEXT_CAIRO
    if (dctx->uctx.type == DRAWTYPE_CAIRO) {
        cairo_new_path(dctx->uctx.u.cairo.cr);
        cairo_move_to(dctx->uctx.u.cairo.cr, x0 + 0.5, y0 + 0.5);
        cairo_line_to(dctx->uctx.u.cairo.cr, x1 + 0.5, y1 + 0.5);
        cairo_stroke(dctx->uctx.u.cairo.cr);
    }
#endif
}

static void draw_stretch_before(struct draw_ctx *dctx, int x, int y,
                                int w, int wdouble,
                                int h, int hdouble, int hbothalf)
{
#ifdef DRAW_TEXT_CAIRO
    if (dctx->uctx.type == DRAWTYPE_CAIRO) {
        cairo_matrix_t matrix;

        matrix.xy = 0;
        matrix.yx = 0;

        if (wdouble) {
            matrix.xx = 2;
            matrix.x0 = -x;
        } else {
            matrix.xx = 1;
            matrix.x0 = 0;
        }

        if (hdouble) {
            matrix.yy = 2;
            if (hbothalf) {
                matrix.y0 = -(y+h);
            } else {
                matrix.y0 = -y;
            }
        } else {
            matrix.yy = 1;
            matrix.y0 = 0;
        }
        cairo_transform(dctx->uctx.u.cairo.cr, &matrix);
    }
#endif
}

static void draw_stretch_after(struct draw_ctx *dctx, int x, int y,
                               int w, int wdouble,
                               int h, int hdouble, int hbothalf)
{
#ifdef DRAW_TEXT_GDK
#ifndef NO_BACKING_PIXMAPS
    if (dctx->uctx.type == DRAWTYPE_GDK) {
        /*
         * I can't find any plausible StretchBlt equivalent in the X
         * server, so I'm going to do this the slow and painful way.
         * This will involve repeated calls to gdk_draw_pixmap() to
         * stretch the text horizontally. It's O(N^2) in time and O(N)
         * in network bandwidth, but you try thinking of a better way.
         * :-(
         */
        int i;
        if (wdouble) {
            for (i = 0; i < w; i++) {
                gdk_draw_pixmap(dctx->uctx.u.gdk.target,
                                dctx->uctx.u.gdk.gc,
                                dctx->uctx.u.gdk.target,
                                x + 2*i, y,
                                x + 2*i+1, y,
                                w - i, h);
            }
            w *= 2;
        }

        if (hdouble) {
            int dt, db;
            /* Now stretch vertically, in the same way. */
            if (hbothalf)
                dt = 0, db = 1;
            else
                dt = 1, db = 0;
            for (i = 0; i < h; i += 2) {
                gdk_draw_pixmap(dctx->uctx.u.gdk.target,
                                dctx->uctx.u.gdk.gc,
                                dctx->uctx.u.gdk.target,
                                x, y + dt*i + db,
                                x, y + dt*(i+1),
                                w, h-i-1);
            }
        }
    }
#else
#error No way to implement stretching in GDK without a reliable backing pixmap
#endif
#endif /* DRAW_TEXT_GDK */
#ifdef DRAW_TEXT_CAIRO
    if (dctx->uctx.type == DRAWTYPE_CAIRO) {
        cairo_set_matrix(dctx->uctx.u.cairo.cr,
                         &dctx->uctx.u.cairo.origmatrix);
    }
#endif
}

static void draw_backing_rect(struct gui_data *inst)
{
    struct draw_ctx *dctx = get_ctx(inst);
    draw_set_colour(dctx, 258);
    draw_rectangle(dctx, 1, 0, 0,
                   inst->width * inst->font_width + 2*inst->window_border,
                   inst->height * inst->font_height + 2*inst->window_border);
    free_ctx(dctx);
}

/*
 * Draw a line of text in the window, at given character
 * coordinates, in given attributes.
 *
 * We are allowed to fiddle with the contents of `text'.
 */
void do_text_internal(Context ctx, int x, int y, wchar_t *text, int len,
                      unsigned long attr, int lattr)
{
    struct draw_ctx *dctx = (struct draw_ctx *)ctx;
    struct gui_data *inst = dctx->inst;
    int ncombining, combining;
    int nfg, nbg, t, fontid, shadow, rlen, widefactor, bold;
    int monochrome =
        gdk_visual_get_depth(gtk_widget_get_visual(inst->area)) == 1;

    if (attr & TATTR_COMBINING) {
        ncombining = len;
        len = 1;
    } else
        ncombining = 1;

    nfg = ((monochrome ? ATTR_DEFFG : (attr & ATTR_FGMASK)) >> ATTR_FGSHIFT);
    nbg = ((monochrome ? ATTR_DEFBG : (attr & ATTR_BGMASK)) >> ATTR_BGSHIFT);
    if (!!(attr & ATTR_REVERSE) ^ (monochrome && (attr & TATTR_ACTCURS))) {
        t = nfg;
        nfg = nbg;
        nbg = t;
    }
    if ((inst->bold_style & 2) && (attr & ATTR_BOLD)) {
        if (nfg < 16) nfg |= 8;
        else if (nfg >= 256) nfg |= 1;
    }
    if ((inst->bold_style & 2) && (attr & ATTR_BLINK)) {
        if (nbg < 16) nbg |= 8;
        else if (nbg >= 256) nbg |= 1;
    }
    if ((attr & TATTR_ACTCURS) && !monochrome) {
        nfg = 260;
        nbg = 261;
    }

    fontid = shadow = 0;

    if (attr & ATTR_WIDE) {
        widefactor = 2;
        fontid |= 2;
    } else {
        widefactor = 1;
    }

    if ((attr & ATTR_BOLD) && (inst->bold_style & 1)) {
        bold = 1;
        fontid |= 1;
    } else {
        bold = 0;
    }

    if (!inst->fonts[fontid]) {
        int i;
        /*
         * Fall back through font ids with subsets of this one's
         * set bits, in order.
         */
        for (i = fontid; i-- > 0 ;) {
            if (i & ~fontid)
                continue;              /* some other bit is set */
            if (inst->fonts[i]) {
                fontid = i;
                break;
            }
        }
        assert(inst->fonts[fontid]);   /* we should at least have hit zero */
    }

    if ((lattr & LATTR_MODE) != LATTR_NORM) {
        x *= 2;
        if (x >= inst->term->cols)
            return;
        if (x + len*2*widefactor > inst->term->cols)
            len = (inst->term->cols-x)/2/widefactor;/* trim to LH half */
        rlen = len * 2;
    } else
        rlen = len;

    draw_clip(dctx,
              x*inst->font_width+inst->window_border,
              y*inst->font_height+inst->window_border,
              rlen*widefactor*inst->font_width,
              inst->font_height);

    if ((lattr & LATTR_MODE) != LATTR_NORM) {
        draw_stretch_before(dctx,
                            x*inst->font_width+inst->window_border,
                            y*inst->font_height+inst->window_border,
                            rlen*widefactor*inst->font_width, TRUE,
                            inst->font_height,
                            ((lattr & LATTR_MODE) != LATTR_WIDE),
                            ((lattr & LATTR_MODE) == LATTR_BOT));
    }

    draw_set_colour(dctx, nbg);
    draw_rectangle(dctx, TRUE,
                   x*inst->font_width+inst->window_border,
                   y*inst->font_height+inst->window_border,
                   rlen*widefactor*inst->font_width, inst->font_height);

    draw_set_colour(dctx, nfg);
    for (combining = 0; combining < ncombining; combining++) {
        unifont_draw_text(&dctx->uctx, inst->fonts[fontid],
                          x*inst->font_width+inst->window_border,
                          y*inst->font_height+inst->window_border+inst->fonts[0]->ascent,
                          text + combining, len, widefactor > 1,
                          bold, inst->font_width);
    }

    if (attr & ATTR_UNDER) {
        int uheight = inst->fonts[0]->ascent + 1;
        if (uheight >= inst->font_height)
            uheight = inst->font_height - 1;
        draw_line(dctx, x*inst->font_width+inst->window_border,
                  y*inst->font_height + uheight + inst->window_border,
                  (x+len)*widefactor*inst->font_width-1+inst->window_border,
                  y*inst->font_height + uheight + inst->window_border);
    }

    if ((lattr & LATTR_MODE) != LATTR_NORM) {
        draw_stretch_after(dctx,
                           x*inst->font_width+inst->window_border,
                           y*inst->font_height+inst->window_border,
                           rlen*widefactor*inst->font_width, TRUE,
                           inst->font_height,
                           ((lattr & LATTR_MODE) != LATTR_WIDE),
                           ((lattr & LATTR_MODE) == LATTR_BOT));
    }
}

void do_text(Context ctx, int x, int y, wchar_t *text, int len,
             unsigned long attr, int lattr)
{
    struct draw_ctx *dctx = (struct draw_ctx *)ctx;
    struct gui_data *inst = dctx->inst;
    int widefactor;

    do_text_internal(ctx, x, y, text, len, attr, lattr);

    if (attr & ATTR_WIDE) {
        widefactor = 2;
    } else {
        widefactor = 1;
    }

    if ((lattr & LATTR_MODE) != LATTR_NORM) {
        x *= 2;
        if (x >= inst->term->cols)
            return;
        if (x + len*2*widefactor > inst->term->cols)
            len = (inst->term->cols-x)/2/widefactor;/* trim to LH half */
        len *= 2;
    }

    draw_update(dctx,
                x*inst->font_width+inst->window_border,
                y*inst->font_height+inst->window_border,
                len*widefactor*inst->font_width, inst->font_height);
}

void do_cursor(Context ctx, int x, int y, wchar_t *text, int len,
               unsigned long attr, int lattr)
{
    struct draw_ctx *dctx = (struct draw_ctx *)ctx;
    struct gui_data *inst = dctx->inst;

    int active, passive, widefactor;

    if (attr & TATTR_PASCURS) {
        attr &= ~TATTR_PASCURS;
        passive = 1;
    } else
        passive = 0;
    if ((attr & TATTR_ACTCURS) && inst->cursor_type != 0) {
        attr &= ~TATTR_ACTCURS;
        active = 1;
    } else
        active = 0;
    do_text_internal(ctx, x, y, text, len, attr, lattr);

    if (attr & TATTR_COMBINING)
        len = 1;

    if (attr & ATTR_WIDE) {
        widefactor = 2;
    } else {
        widefactor = 1;
    }

    if ((lattr & LATTR_MODE) != LATTR_NORM) {
        x *= 2;
        if (x >= inst->term->cols)
            return;
        if (x + len*2*widefactor > inst->term->cols)
            len = (inst->term->cols-x)/2/widefactor;/* trim to LH half */
        len *= 2;
    }

    if (inst->cursor_type == 0) {
        /*
         * An active block cursor will already have been done by
         * the above do_text call, so we only need to do anything
         * if it's passive.
         */
        if (passive) {
            draw_set_colour(dctx, 261);
            draw_rectangle(dctx, FALSE,
                           x*inst->font_width+inst->window_border,
                           y*inst->font_height+inst->window_border,
                           len*widefactor*inst->font_width-1,
                           inst->font_height-1);
        }
    } else {
        int uheight;
        int startx, starty, dx, dy, length, i;

        int char_width;

        if ((attr & ATTR_WIDE) || (lattr & LATTR_MODE) != LATTR_NORM)
            char_width = 2*inst->font_width;
        else
            char_width = inst->font_width;

        if (inst->cursor_type == 1) {
            uheight = inst->fonts[0]->ascent + 1;
            if (uheight >= inst->font_height)
                uheight = inst->font_height - 1;

            startx = x * inst->font_width + inst->window_border;
            starty = y * inst->font_height + inst->window_border + uheight;
            dx = 1;
            dy = 0;
            length = len * widefactor * char_width;
        } else {
            int xadjust = 0;
            if (attr & TATTR_RIGHTCURS)
                xadjust = char_width - 1;
            startx = x * inst->font_width + inst->window_border + xadjust;
            starty = y * inst->font_height + inst->window_border;
            dx = 0;
            dy = 1;
            length = inst->font_height;
        }

        draw_set_colour(dctx, 261);
        if (passive) {
            for (i = 0; i < length; i++) {
                if (i % 2 == 0) {
                    draw_point(dctx, startx, starty);
                }
                startx += dx;
                starty += dy;
            }
        } else if (active) {
            draw_line(dctx, startx, starty,
                      startx + (length-1) * dx, starty + (length-1) * dy);
        } /* else no cursor (e.g., blinked off) */
    }

    draw_update(dctx,
                x*inst->font_width+inst->window_border,
                y*inst->font_height+inst->window_border,
                len*widefactor*inst->font_width, inst->font_height);

#if GTK_CHECK_VERSION(2,0,0)
    {
        GdkRectangle cursorrect;
        cursorrect.x = x*inst->font_width+inst->window_border;
        cursorrect.y = y*inst->font_height+inst->window_border;
        cursorrect.width = len*widefactor*inst->font_width;
        cursorrect.height = inst->font_height;
        gtk_im_context_set_cursor_location(inst->imc, &cursorrect);
    }
#endif
}

GdkCursor *make_mouse_ptr(struct gui_data *inst, int cursor_val)
{
    if (cursor_val == -1) {
#if GTK_CHECK_VERSION(2,16,0)
        cursor_val = GDK_BLANK_CURSOR;
#else
        /*
         * Work around absence of GDK_BLANK_CURSOR by inventing a
         * blank pixmap.
         */
        GdkCursor *ret;
        GdkColor bg = { 0, 0, 0, 0 };
        GdkPixmap *pm = gdk_pixmap_new(NULL, 1, 1, 1);
        GdkGC *gc = gdk_gc_new(pm);
        gdk_gc_set_foreground(gc, &bg);
        gdk_draw_rectangle(pm, gc, 1, 0, 0, 1, 1);
        gdk_gc_unref(gc);
        ret = gdk_cursor_new_from_pixmap(pm, pm, &bg, &bg, 1, 1);
        gdk_pixmap_unref(pm);
        return ret;
#endif
    }

    return gdk_cursor_new(cursor_val);
}

void modalfatalbox(const char *p, ...)
{
    va_list ap;
    fprintf(stderr, "FATAL ERROR: ");
    va_start(ap, p);
    vfprintf(stderr, p, ap);
    va_end(ap);
    fputc('\n', stderr);
    exit(1);
}

void cmdline_error(const char *p, ...)
{
    va_list ap;
    fprintf(stderr, "%s: ", appname);
    va_start(ap, p);
    vfprintf(stderr, p, ap);
    va_end(ap);
    fputc('\n', stderr);
    exit(1);
}

char *get_x_display(void *frontend)
{
    return gdk_get_display();
}

#ifndef NOT_X_WINDOWS
long get_windowid(void *frontend)
{
    struct gui_data *inst = (struct gui_data *)frontend;
    return (long)GDK_WINDOW_XWINDOW(gtk_widget_get_window(inst->area));
}
#endif

static void help(FILE *fp) {
    if(fprintf(fp,
"pterm option summary:\n"
"\n"
"  --display DISPLAY         Specify X display to use (note '--')\n"
"  -name PREFIX              Prefix when looking up resources (default: pterm)\n"
"  -fn FONT                  Normal text font\n"
"  -fb FONT                  Bold text font\n"
"  -geometry GEOMETRY        Position and size of window (size in characters)\n"
"  -sl LINES                 Number of lines of scrollback\n"
"  -fg COLOUR, -bg COLOUR    Foreground/background colour\n"
"  -bfg COLOUR, -bbg COLOUR  Foreground/background bold colour\n"
"  -cfg COLOUR, -bfg COLOUR  Foreground/background cursor colour\n"
"  -T TITLE                  Window title\n"
"  -ut, +ut                  Do(default) or do not update utmp\n"
"  -ls, +ls                  Do(default) or do not make shell a login shell\n"
"  -sb, +sb                  Do(default) or do not display a scrollbar\n"
"  -log PATH                 Log all output to a file\n"
"  -nethack                  Map numeric keypad to hjklyubn direction keys\n"
"  -xrm RESOURCE-STRING      Set an X resource\n"
"  -e COMMAND [ARGS...]      Execute command (consumes all remaining args)\n"
         ) < 0 || fflush(fp) < 0) {
        perror("output error");
        exit(1);
    }
}

static void version(FILE *fp) {
    if(fprintf(fp, "%s: %s\n", appname, ver) < 0 || fflush(fp) < 0) {
        perror("output error");
        exit(1);
    }
}

int do_cmdline(int argc, char **argv, int do_everything, int *allow_launch,
               struct gui_data *inst, Conf *conf)
{
    int err = 0;
    char *val;

    /*
     * Macros to make argument handling easier. Note that because
     * they need to call `continue', they cannot be contained in
     * the usual do {...} while (0) wrapper to make them
     * syntactically single statements; hence it is not legal to
     * use one of these macros as an unbraced statement between
     * `if' and `else'.
     */
#define EXPECTS_ARG { \
    if (--argc <= 0) { \
        err = 1; \
        fprintf(stderr, "%s: %s expects an argument\n", appname, p); \
        continue; \
    } else \
        val = *++argv; \
}
#define SECOND_PASS_ONLY { if (!do_everything) continue; }

    while (--argc > 0) {
        const char *p = *++argv;
        int ret;

        /*
         * Shameless cheating. Debian requires all X terminal
         * emulators to support `-T title'; but
         * cmdline_process_param will eat -T (it means no-pty) and
         * complain that pterm doesn't support it. So, in pterm
         * only, we convert -T into -title.
         */
        if ((cmdline_tooltype & TOOLTYPE_NONNETWORK) &&
            !strcmp(p, "-T"))
            p = "-title";

        ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
                                    do_everything ? 1 : -1, conf);

        if (ret == -2) {
            cmdline_error("option \"%s\" requires an argument", p);
        } else if (ret == 2) {
            --argc, ++argv;            /* skip next argument */
            continue;
        } else if (ret == 1) {
            continue;
        }

        if (!strcmp(p, "-fn") || !strcmp(p, "-font")) {
            FontSpec *fs;
            EXPECTS_ARG;
            SECOND_PASS_ONLY;
            fs = fontspec_new(val);
            conf_set_fontspec(conf, CONF_font, fs);
            fontspec_free(fs);

        } else if (!strcmp(p, "-fb")) {
            FontSpec *fs;
            EXPECTS_ARG;
            SECOND_PASS_ONLY;
            fs = fontspec_new(val);
            conf_set_fontspec(conf, CONF_boldfont, fs);
            fontspec_free(fs);

        } else if (!strcmp(p, "-fw")) {
            FontSpec *fs;
            EXPECTS_ARG;
            SECOND_PASS_ONLY;
            fs = fontspec_new(val);
            conf_set_fontspec(conf, CONF_widefont, fs);
            fontspec_free(fs);

        } else if (!strcmp(p, "-fwb")) {
            FontSpec *fs;
            EXPECTS_ARG;
            SECOND_PASS_ONLY;
            fs = fontspec_new(val);
            conf_set_fontspec(conf, CONF_wideboldfont, fs);
            fontspec_free(fs);

        } else if (!strcmp(p, "-cs")) {
            EXPECTS_ARG;
            SECOND_PASS_ONLY;
            conf_set_str(conf, CONF_line_codepage, val);

        } else if (!strcmp(p, "-geometry")) {
            EXPECTS_ARG;
            SECOND_PASS_ONLY;

#if GTK_CHECK_VERSION(2,0,0)
            inst->geometry = val;
#else
            /* On GTK 1, we have to do this using raw Xlib */
            {
                int flags, x, y;
                unsigned int w, h;
                flags = XParseGeometry(val, &x, &y, &w, &h);
                if (flags & WidthValue)
                    conf_set_int(conf, CONF_width, w);
                if (flags & HeightValue)
                    conf_set_int(conf, CONF_height, h);

                if (flags & (XValue | YValue)) {
                    inst->xpos = x;
                    inst->ypos = y;
                    inst->gotpos = TRUE;
                    inst->gravity = ((flags & XNegative ? 1 : 0) |
                                     (flags & YNegative ? 2 : 0));
                }
            }
#endif

        } else if (!strcmp(p, "-sl")) {
            EXPECTS_ARG;
            SECOND_PASS_ONLY;
            conf_set_int(conf, CONF_savelines, atoi(val));

        } else if (!strcmp(p, "-fg") || !strcmp(p, "-bg") ||
                   !strcmp(p, "-bfg") || !strcmp(p, "-bbg") ||
                   !strcmp(p, "-cfg") || !strcmp(p, "-cbg")) {
            GdkColor col;

            EXPECTS_ARG;
            SECOND_PASS_ONLY;
            if (!gdk_color_parse(val, &col)) {
                err = 1;
                fprintf(stderr, "%s: unable to parse colour \"%s\"\n",
                        appname, val);
            } else {
                int index;
                index = (!strcmp(p, "-fg") ? 0 :
                         !strcmp(p, "-bg") ? 2 :
                         !strcmp(p, "-bfg") ? 1 :
                         !strcmp(p, "-bbg") ? 3 :
                         !strcmp(p, "-cfg") ? 4 :
                         !strcmp(p, "-cbg") ? 5 : -1);
                assert(index != -1);
                conf_set_int_int(conf, CONF_colours, index*3+0, col.red / 256);
                conf_set_int_int(conf, CONF_colours, index*3+1,col.green/ 256);
                conf_set_int_int(conf, CONF_colours, index*3+2, col.blue/ 256);
            }

        } else if (use_pty_argv && !strcmp(p, "-e")) {
            /* This option swallows all further arguments. */
            if (!do_everything)
                break;

            if (--argc > 0) {
                int i;
                pty_argv = snewn(argc+1, char *);
                ++argv;
                for (i = 0; i < argc; i++)
                    pty_argv[i] = argv[i];
                pty_argv[argc] = NULL;
                break;                 /* finished command-line processing */
            } else
                err = 1, fprintf(stderr, "%s: -e expects an argument\n",
                                 appname);

        } else if (!strcmp(p, "-title")) {
            EXPECTS_ARG;
            SECOND_PASS_ONLY;
            conf_set_str(conf, CONF_wintitle, val);

        } else if (!strcmp(p, "-log")) {
            Filename *fn;
            EXPECTS_ARG;
            SECOND_PASS_ONLY;
            fn = filename_from_str(val);
            conf_set_filename(conf, CONF_logfilename, fn);
            conf_set_int(conf, CONF_logtype, LGTYP_DEBUG);
            filename_free(fn);

        } else if (!strcmp(p, "-ut-") || !strcmp(p, "+ut")) {
            SECOND_PASS_ONLY;
            conf_set_int(conf, CONF_stamp_utmp, 0);

        } else if (!strcmp(p, "-ut")) {
            SECOND_PASS_ONLY;
            conf_set_int(conf, CONF_stamp_utmp, 1);

        } else if (!strcmp(p, "-ls-") || !strcmp(p, "+ls")) {
            SECOND_PASS_ONLY;
            conf_set_int(conf, CONF_login_shell, 0);

        } else if (!strcmp(p, "-ls")) {
            SECOND_PASS_ONLY;
            conf_set_int(conf, CONF_login_shell, 1);

        } else if (!strcmp(p, "-nethack")) {
            SECOND_PASS_ONLY;
            conf_set_int(conf, CONF_nethack_keypad, 1);

        } else if (!strcmp(p, "-sb-") || !strcmp(p, "+sb")) {
            SECOND_PASS_ONLY;
            conf_set_int(conf, CONF_scrollbar, 0);

        } else if (!strcmp(p, "-sb")) {
            SECOND_PASS_ONLY;
            conf_set_int(conf, CONF_scrollbar, 1);

        } else if (!strcmp(p, "-name")) {
            EXPECTS_ARG;
            app_name = val;

        } else if (!strcmp(p, "-xrm")) {
            EXPECTS_ARG;
            provide_xrm_string(val);

        } else if(!strcmp(p, "-help") || !strcmp(p, "--help")) {
            help(stdout);
            exit(0);

        } else if(!strcmp(p, "-version") || !strcmp(p, "--version")) {
            version(stdout);
            exit(0);

        } else if (!strcmp(p, "-pgpfp")) {
            pgp_fingerprints();
            exit(1);

        } else if(p[0] != '-' && (!do_everything ||
                                  process_nonoption_arg(p, conf,
                                                        allow_launch))) {
            /* do nothing */

        } else {
            err = 1;
            fprintf(stderr, "%s: unrecognized option '%s'\n", appname, p);
        }
    }

    return err;
}

struct uxsel_id {
    int id;
};

uxsel_id *uxsel_input_add(int fd, int rwx) {
    uxsel_id *id = snew(uxsel_id);

    int flags = 0;
    if (rwx & 1) flags |= GDK_INPUT_READ;
    if (rwx & 2) flags |= GDK_INPUT_WRITE;
    if (rwx & 4) flags |= GDK_INPUT_EXCEPTION;
    assert(flags);
    id->id = gdk_input_add(fd, flags, fd_input_func, NULL);

    return id;
}

void uxsel_input_remove(uxsel_id *id) {
    gdk_input_remove(id->id);
    sfree(id);
}

char *setup_fonts_ucs(struct gui_data *inst)
{
    int shadowbold = conf_get_int(inst->conf, CONF_shadowbold);
    int shadowboldoffset = conf_get_int(inst->conf, CONF_shadowboldoffset);
    FontSpec *fs;
    unifont *fonts[4];
    int i;

    fs = conf_get_fontspec(inst->conf, CONF_font);
    fonts[0] = multifont_create(inst->area, fs->name, FALSE, FALSE,
                                shadowboldoffset, shadowbold);
    if (!fonts[0]) {
        return dupprintf("unable to load font \"%s\"", fs->name);
    }

    fs = conf_get_fontspec(inst->conf, CONF_boldfont);
    if (shadowbold || !fs->name[0]) {
        fonts[1] = NULL;
    } else {
        fonts[1] = multifont_create(inst->area, fs->name, FALSE, TRUE,
                                    shadowboldoffset, shadowbold);
        if (!fonts[1]) {
            if (fonts[0])
                unifont_destroy(fonts[0]);
            return dupprintf("unable to load bold font \"%s\"", fs->name);
        }
    }

    fs = conf_get_fontspec(inst->conf, CONF_widefont);
    if (fs->name[0]) {
        fonts[2] = multifont_create(inst->area, fs->name, TRUE, FALSE,
                                    shadowboldoffset, shadowbold);
        if (!fonts[2]) {
            for (i = 0; i < 2; i++)
                if (fonts[i])
                    unifont_destroy(fonts[i]);
            return dupprintf("unable to load wide font \"%s\"", fs->name);
        }
    } else {
        fonts[2] = NULL;
    }

    fs = conf_get_fontspec(inst->conf, CONF_wideboldfont);
    if (shadowbold || !fs->name[0]) {
        fonts[3] = NULL;
    } else {
        fonts[3] = multifont_create(inst->area, fs->name, TRUE, TRUE,
                                    shadowboldoffset, shadowbold);
        if (!fonts[3]) {
            for (i = 0; i < 3; i++)
                if (fonts[i])
                    unifont_destroy(fonts[i]);
            return dupprintf("unable to load wide bold font \"%s\"", fs->name);
        }
    }

    /*
     * Now we've got past all the possible error conditions, we can
     * actually update our state.
     */

    for (i = 0; i < 4; i++) {
        if (inst->fonts[i])
            unifont_destroy(inst->fonts[i]);
        inst->fonts[i] = fonts[i];
    }

    inst->font_width = inst->fonts[0]->width;
    inst->font_height = inst->fonts[0]->height;

    inst->direct_to_font = init_ucs(&inst->ucsdata,
                                    conf_get_str(inst->conf, CONF_line_codepage),
                                    conf_get_int(inst->conf, CONF_utf8_override),
                                    inst->fonts[0]->public_charset,
                                    conf_get_int(inst->conf, CONF_vtmode));

    inst->drawtype = inst->fonts[0]->preferred_drawtype;

    return NULL;
}

void set_geom_hints(struct gui_data *inst)
{
    GdkGeometry geom;
    geom.min_width = inst->font_width + 2*inst->window_border;
    geom.min_height = inst->font_height + 2*inst->window_border;
    geom.max_width = geom.max_height = -1;
    geom.base_width = 2*inst->window_border;
    geom.base_height = 2*inst->window_border;
    geom.width_inc = inst->font_width;
    geom.height_inc = inst->font_height;
    geom.min_aspect = geom.max_aspect = 0;
    gtk_window_set_geometry_hints(GTK_WINDOW(inst->window), inst->area, &geom,
                                  GDK_HINT_MIN_SIZE | GDK_HINT_BASE_SIZE |
                                  GDK_HINT_RESIZE_INC);
}

void clear_scrollback_menuitem(GtkMenuItem *item, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    term_clrsb(inst->term);
}

void reset_terminal_menuitem(GtkMenuItem *item, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    term_pwron(inst->term, TRUE);
    if (inst->ldisc)
        ldisc_echoedit_update(inst->ldisc);
}

void copy_all_menuitem(GtkMenuItem *item, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    term_copyall(inst->term);
}

void special_menuitem(GtkMenuItem *item, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    int code = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(item),
                                                 "user-data"));

    if (inst->back)
        inst->back->special(inst->backhandle, code);
}

void about_menuitem(GtkMenuItem *item, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    about_box(inst->window);
}

void event_log_menuitem(GtkMenuItem *item, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    showeventlog(inst->eventlogstuff, inst->window);
}

void change_settings_menuitem(GtkMenuItem *item, gpointer data)
{
    /* This maps colour indices in inst->conf to those used in inst->cols. */
    static const int ww[] = {
        256, 257, 258, 259, 260, 261,
        0, 8, 1, 9, 2, 10, 3, 11,
        4, 12, 5, 13, 6, 14, 7, 15
    };
    struct gui_data *inst = (struct gui_data *)data;
    char *title;
    Conf *oldconf, *newconf;
    int i, j, need_size;

    assert(lenof(ww) == NCFGCOLOURS);

    if (inst->reconfiguring)
      return;
    else
      inst->reconfiguring = TRUE;

    title = dupcat(appname, " Reconfiguration", NULL);

    oldconf = inst->conf;
    newconf = conf_copy(inst->conf);

    if (do_config_box(title, newconf, 1,
                      inst->back?inst->back->cfg_info(inst->backhandle):0)) {
        inst->conf = newconf;

        /* Pass new config data to the logging module */
        log_reconfig(inst->logctx, inst->conf);
        /*
         * Flush the line discipline's edit buffer in the case
         * where local editing has just been disabled.
         */
        if (inst->ldisc) {
            ldisc_configure(inst->ldisc, inst->conf);
            ldisc_echoedit_update(inst->ldisc);
        }
        /* Pass new config data to the terminal */
        term_reconfig(inst->term, inst->conf);
        /* Pass new config data to the back end */
        if (inst->back)
            inst->back->reconfig(inst->backhandle, inst->conf);

        cache_conf_values(inst);

        /*
         * Just setting inst->conf is sufficient to cause colour
         * setting changes to appear on the next ESC]R palette
         * reset. But we should also check whether any colour
         * settings have been changed, and revert the ones that have
         * to the new default, on the assumption that the user is
         * most likely to want an immediate update.
         */
        for (i = 0; i < NCFGCOLOURS; i++) {
            for (j = 0; j < 3; j++)
                if (conf_get_int_int(oldconf, CONF_colours, i*3+j) !=
                    conf_get_int_int(newconf, CONF_colours, i*3+j))
                    break;
            if (j < 3) {
                real_palette_set(inst, ww[i],
                                 conf_get_int_int(newconf,CONF_colours,i*3+0),
                                 conf_get_int_int(newconf,CONF_colours,i*3+1),
                                 conf_get_int_int(newconf,CONF_colours,i*3+2));

                /*
                 * If the default background has changed, we must
                 * repaint the space in between the window border
                 * and the text area.
                 */
                if (ww[i] == 258) {
                    set_window_background(inst);
                    draw_backing_rect(inst);
                }
            }
        }

        /*
         * If the scrollbar needs to be shown, hidden, or moved
         * from one end to the other of the window, do so now.
         */
        if (conf_get_int(oldconf, CONF_scrollbar) !=
            conf_get_int(newconf, CONF_scrollbar)) {
            if (conf_get_int(newconf, CONF_scrollbar))
                gtk_widget_show(inst->sbar);
            else
                gtk_widget_hide(inst->sbar);
        }
        if (conf_get_int(oldconf, CONF_scrollbar_on_left) !=
            conf_get_int(newconf, CONF_scrollbar_on_left)) {
            gtk_box_reorder_child(inst->hbox, inst->sbar,
                                  conf_get_int(newconf, CONF_scrollbar_on_left)
                                  ? 0 : 1);
        }

        /*
         * Change the window title, if required.
         */
        if (strcmp(conf_get_str(oldconf, CONF_wintitle),
                   conf_get_str(newconf, CONF_wintitle)))
            set_title(inst, conf_get_str(newconf, CONF_wintitle));
        set_window_titles(inst);

        /*
         * Redo the whole tangled fonts and Unicode mess if
         * necessary.
         */
        need_size = FALSE;
        if (strcmp(conf_get_fontspec(oldconf, CONF_font)->name,
                   conf_get_fontspec(newconf, CONF_font)->name) ||
            strcmp(conf_get_fontspec(oldconf, CONF_boldfont)->name,
                   conf_get_fontspec(newconf, CONF_boldfont)->name) ||
            strcmp(conf_get_fontspec(oldconf, CONF_widefont)->name,
                   conf_get_fontspec(newconf, CONF_widefont)->name) ||
            strcmp(conf_get_fontspec(oldconf, CONF_wideboldfont)->name,
                   conf_get_fontspec(newconf, CONF_wideboldfont)->name) ||
            strcmp(conf_get_str(oldconf, CONF_line_codepage),
                   conf_get_str(newconf, CONF_line_codepage)) ||
            conf_get_int(oldconf, CONF_utf8_override) !=
            conf_get_int(newconf, CONF_utf8_override) ||
            conf_get_int(oldconf, CONF_vtmode) !=
            conf_get_int(newconf, CONF_vtmode) ||
            conf_get_int(oldconf, CONF_shadowbold) !=
            conf_get_int(newconf, CONF_shadowbold) ||
            conf_get_int(oldconf, CONF_shadowboldoffset) !=
            conf_get_int(newconf, CONF_shadowboldoffset)) {
            char *errmsg = setup_fonts_ucs(inst);
            if (errmsg) {
                char *msgboxtext =
                    dupprintf("Could not change fonts in terminal window: %s\n",
                              errmsg);
                messagebox(inst->window, "Font setup error", msgboxtext,
                           string_width("Could not change fonts in terminal window:"),
                           "OK", 'o', +1, 1,
                           NULL);
                sfree(msgboxtext);
                sfree(errmsg);
            } else {
                need_size = TRUE;
            }
        }

        /*
         * Resize the window.
         */
        if (conf_get_int(oldconf, CONF_width) !=
            conf_get_int(newconf, CONF_width) ||
            conf_get_int(oldconf, CONF_height) !=
            conf_get_int(newconf, CONF_height) ||
            conf_get_int(oldconf, CONF_window_border) !=
            conf_get_int(newconf, CONF_window_border) ||
            need_size) {
            set_geom_hints(inst);
            request_resize(inst, conf_get_int(newconf, CONF_width),
                           conf_get_int(newconf, CONF_height));
        } else {
            /*
             * The above will have caused a call to term_size() for
             * us if it happened. If the user has fiddled with only
             * the scrollback size, the above will not have
             * happened and we will need an explicit term_size()
             * here.
             */
            if (conf_get_int(oldconf, CONF_savelines) !=
                conf_get_int(newconf, CONF_savelines))
                term_size(inst->term, inst->term->rows, inst->term->cols,
                          conf_get_int(newconf, CONF_savelines));
        }

        term_invalidate(inst->term);

        /*
         * We do an explicit full redraw here to ensure the window
         * border has been redrawn as well as the text area.
         */
        gtk_widget_queue_draw(inst->area);

        conf_free(oldconf);
    } else {
        conf_free(newconf);
    }
    sfree(title);
    inst->reconfiguring = FALSE;
}

void fork_and_exec_self(struct gui_data *inst, int fd_to_close, ...)
{
    /*
     * Re-execing ourself is not an exact science under Unix. I do
     * the best I can by using /proc/self/exe if available and by
     * assuming argv[0] can be found on $PATH if not.
     * 
     * Note that we also have to reconstruct the elements of the
     * original argv which gtk swallowed, since the user wants the
     * new session to appear on the same X display as the old one.
     */
    char **args;
    va_list ap;
    int i, n;
    int pid;

    /*
     * Collect the arguments with which to re-exec ourself.
     */
    va_start(ap, fd_to_close);
    n = 2;                             /* progname and terminating NULL */
    n += inst->ngtkargs;
    while (va_arg(ap, char *) != NULL)
        n++;
    va_end(ap);

    args = snewn(n, char *);
    args[0] = inst->progname;
    args[n-1] = NULL;
    for (i = 0; i < inst->ngtkargs; i++)
        args[i+1] = inst->gtkargvstart[i];

    i++;
    va_start(ap, fd_to_close);
    while ((args[i++] = va_arg(ap, char *)) != NULL);
    va_end(ap);

    assert(i == n);

    /*
     * Do the double fork.
     */
    pid = fork();
    if (pid < 0) {
        perror("fork");
        sfree(args);
        return;
    }

    if (pid == 0) {
        int pid2 = fork();
        if (pid2 < 0) {
            perror("fork");
            _exit(1);
        } else if (pid2 > 0) {
            /*
             * First child has successfully forked second child. My
             * Work Here Is Done. Note the use of _exit rather than
             * exit: the latter appears to cause destroy messages
             * to be sent to the X server. I suspect gtk uses
             * atexit.
             */
            _exit(0);
        }

        /*
         * If we reach here, we are the second child, so we now
         * actually perform the exec.
         */
        if (fd_to_close >= 0)
            close(fd_to_close);

        execv("/proc/self/exe", args);
        execvp(inst->progname, args);
        perror("exec");
        _exit(127);

    } else {
        int status;
        sfree(args);
        waitpid(pid, &status, 0);
    }

}

void dup_session_menuitem(GtkMenuItem *item, gpointer gdata)
{
    struct gui_data *inst = (struct gui_data *)gdata;
    /*
     * For this feature we must marshal conf and (possibly) pty_argv
     * into a byte stream, create a pipe, and send this byte stream
     * to the child through the pipe.
     */
    int i, ret, sersize, size;
    char *data;
    char option[80];
    int pipefd[2];

    if (pipe(pipefd) < 0) {
        perror("pipe");
        return;
    }

    size = sersize = conf_serialised_size(inst->conf);
    if (use_pty_argv && pty_argv) {
        for (i = 0; pty_argv[i]; i++)
            size += strlen(pty_argv[i]) + 1;
    }

    data = snewn(size, char);
    conf_serialise(inst->conf, data);
    if (use_pty_argv && pty_argv) {
        int p = sersize;
        for (i = 0; pty_argv[i]; i++) {
            strcpy(data + p, pty_argv[i]);
            p += strlen(pty_argv[i]) + 1;
        }
        assert(p == size);
    }

    sprintf(option, "---[%d,%d]", pipefd[0], size);
    noncloexec(pipefd[0]);
    fork_and_exec_self(inst, pipefd[1], option, NULL);
    close(pipefd[0]);

    i = ret = 0;
    while (i < size && (ret = write(pipefd[1], data + i, size - i)) > 0)
        i += ret;
    if (ret < 0)
        perror("write to pipe");
    close(pipefd[1]);
    sfree(data);
}

int read_dupsession_data(struct gui_data *inst, Conf *conf, char *arg)
{
    int fd, i, ret, size, size_used;
    char *data;

    if (sscanf(arg, "---[%d,%d]", &fd, &size) != 2) {
        fprintf(stderr, "%s: malformed magic argument `%s'\n", appname, arg);
        exit(1);
    }

    data = snewn(size, char);
    i = ret = 0;
    while (i < size && (ret = read(fd, data + i, size - i)) > 0)
        i += ret;
    if (ret < 0) {
        perror("read from pipe");
        exit(1);
    } else if (i < size) {
        fprintf(stderr, "%s: unexpected EOF in Duplicate Session data\n",
                appname);
        exit(1);
    }

    size_used = conf_deserialise(conf, data, size);
    if (use_pty_argv && size > size_used) {
        int n = 0;
        i = size_used;
        while (i < size) {
            while (i < size && data[i]) i++;
            if (i >= size) {
                fprintf(stderr, "%s: malformed Duplicate Session data\n",
                        appname);
                exit(1);
            }
            i++;
            n++;
        }
        pty_argv = snewn(n+1, char *);
        pty_argv[n] = NULL;
        n = 0;
        i = size_used;
        while (i < size) {
            char *p = data + i;
            while (i < size && data[i]) i++;
            assert(i < size);
            i++;
            pty_argv[n++] = dupstr(p);
        }
    }

    sfree(data);

    return 0;
}

void new_session_menuitem(GtkMenuItem *item, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;

    fork_and_exec_self(inst, -1, NULL);
}

void restart_session_menuitem(GtkMenuItem *item, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;

    if (!inst->back) {
        logevent(inst, "----- Session restarted -----");
        term_pwron(inst->term, FALSE);
        start_backend(inst);
        inst->exited = FALSE;
    }
}

void saved_session_menuitem(GtkMenuItem *item, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    char *str = (char *)g_object_get_data(G_OBJECT(item), "user-data");

    fork_and_exec_self(inst, -1, "-load", str, NULL);
}

void saved_session_freedata(GtkMenuItem *item, gpointer data)
{
    char *str = (char *)g_object_get_data(G_OBJECT(item), "user-data");

    sfree(str);
}

static void update_savedsess_menu(GtkMenuItem *menuitem, gpointer data)
{
    struct gui_data *inst = (struct gui_data *)data;
    struct sesslist sesslist;
    int i;

    gtk_container_foreach(GTK_CONTAINER(inst->sessionsmenu),
                          (GtkCallback)gtk_widget_destroy, NULL);

    get_sesslist(&sesslist, TRUE);
    /* skip sesslist.sessions[0] == Default Settings */
    for (i = 1; i < sesslist.nsessions; i++) {
        GtkWidget *menuitem =
            gtk_menu_item_new_with_label(sesslist.sessions[i]);
        gtk_container_add(GTK_CONTAINER(inst->sessionsmenu), menuitem);
        gtk_widget_show(menuitem);
        g_object_set_data(G_OBJECT(menuitem), "user-data",
                          dupstr(sesslist.sessions[i]));
        g_signal_connect(G_OBJECT(menuitem), "activate",
                         G_CALLBACK(saved_session_menuitem),
                         inst);
        g_signal_connect(G_OBJECT(menuitem), "destroy",
                         G_CALLBACK(saved_session_freedata),
                         inst);
    }
    if (sesslist.nsessions <= 1) {
        GtkWidget *menuitem =
            gtk_menu_item_new_with_label("(No sessions)");
        gtk_widget_set_sensitive(menuitem, FALSE);
        gtk_container_add(GTK_CONTAINER(inst->sessionsmenu), menuitem);
        gtk_widget_show(menuitem);
    }
    get_sesslist(&sesslist, FALSE); /* free up */
}

void set_window_icon(GtkWidget *window, const char *const *const *icon,
                     int n_icon)
{
#if GTK_CHECK_VERSION(2,0,0)
    GList *iconlist;
    int n;
#else
    GdkPixmap *iconpm;
    GdkBitmap *iconmask;
#endif

    if (!n_icon)
        return;

    gtk_widget_realize(window);
#if GTK_CHECK_VERSION(2,0,0)
    gtk_window_set_icon(GTK_WINDOW(window),
                        gdk_pixbuf_new_from_xpm_data((const gchar **)icon[0]));
#else
    iconpm = gdk_pixmap_create_from_xpm_d(gtk_widget_get_window(window),
                                          &iconmask, NULL, (gchar **)icon[0]);
    gdk_window_set_icon(gtk_widget_get_window(window), NULL, iconpm, iconmask);
#endif

#if GTK_CHECK_VERSION(2,0,0)
    iconlist = NULL;
    for (n = 0; n < n_icon; n++) {
        iconlist =
            g_list_append(iconlist,
                          gdk_pixbuf_new_from_xpm_data((const gchar **)
                                                       icon[n]));
    }
    gtk_window_set_icon_list(GTK_WINDOW(window), iconlist);
#endif
}

void update_specials_menu(void *frontend)
{
    struct gui_data *inst = (struct gui_data *)frontend;

    const struct telnet_special *specials;

    if (inst->back)
        specials = inst->back->get_specials(inst->backhandle);
    else
        specials = NULL;

    /* I believe this disposes of submenus too. */
    gtk_container_foreach(GTK_CONTAINER(inst->specialsmenu),
                          (GtkCallback)gtk_widget_destroy, NULL);
    if (specials) {
        int i;
        GtkWidget *menu = inst->specialsmenu;
        /* A lame "stack" for submenus that will do for now. */
        GtkWidget *saved_menu = NULL;
        int nesting = 1;
        for (i = 0; nesting > 0; i++) {
            GtkWidget *menuitem = NULL;
            switch (specials[i].code) {
              case TS_SUBMENU:
                assert (nesting < 2);
                saved_menu = menu; /* XXX lame stacking */
                menu = gtk_menu_new();
                menuitem = gtk_menu_item_new_with_label(specials[i].name);
                gtk_menu_item_set_submenu(GTK_MENU_ITEM(menuitem), menu);
                gtk_container_add(GTK_CONTAINER(saved_menu), menuitem);
                gtk_widget_show(menuitem);
                menuitem = NULL;
                nesting++;
                break;
              case TS_EXITMENU:
                nesting--;
                if (nesting) {
                    menu = saved_menu; /* XXX lame stacking */
                    saved_menu = NULL;
                }
                break;
              case TS_SEP:
                menuitem = gtk_menu_item_new();
                break;
              default:
                menuitem = gtk_menu_item_new_with_label(specials[i].name);
                g_object_set_data(G_OBJECT(menuitem), "user-data",
                                  GINT_TO_POINTER(specials[i].code));
                g_signal_connect(G_OBJECT(menuitem), "activate",
                                 G_CALLBACK(special_menuitem), inst);
                break;
            }
            if (menuitem) {
                gtk_container_add(GTK_CONTAINER(menu), menuitem);
                gtk_widget_show(menuitem);
            }
        }
        gtk_widget_show(inst->specialsitem1);
        gtk_widget_show(inst->specialsitem2);
    } else {
        gtk_widget_hide(inst->specialsitem1);
        gtk_widget_hide(inst->specialsitem2);
    }
}

static void start_backend(struct gui_data *inst)
{
    extern Backend *select_backend(Conf *conf);
    char *realhost;
    const char *error;
    char *s;

    inst->back = select_backend(inst->conf);

    error = inst->back->init((void *)inst, &inst->backhandle,
                             inst->conf,
                             conf_get_str(inst->conf, CONF_host),
                             conf_get_int(inst->conf, CONF_port),
                             &realhost,
                             conf_get_int(inst->conf, CONF_tcp_nodelay),
                             conf_get_int(inst->conf, CONF_tcp_keepalives));

    if (error) {
        char *msg = dupprintf("Unable to open connection to %s:\n%s",
                              conf_get_str(inst->conf, CONF_host), error);
        inst->exited = TRUE;
        fatal_message_box(inst->window, msg);
        sfree(msg);
        exit(0);
    }

    s = conf_get_str(inst->conf, CONF_wintitle);
    if (s[0]) {
        set_title_and_icon(inst, s, s);
    } else {
        char *title = make_default_wintitle(realhost);
        set_title_and_icon(inst, title, title);
        sfree(title);
    }
    sfree(realhost);

    inst->back->provide_logctx(inst->backhandle, inst->logctx);

    term_provide_resize_fn(inst->term, inst->back->size, inst->backhandle);

    inst->ldisc =
        ldisc_create(inst->conf, inst->term, inst->back, inst->backhandle,
                     inst);

    gtk_widget_set_sensitive(inst->restartitem, FALSE);
}

int pt_main(int argc, char **argv)
{
    extern int cfgbox(Conf *conf);
    struct gui_data *inst;

    setlocale(LC_CTYPE, "");

    /*
     * Create an instance structure and initialise to zeroes
     */
    inst = snew(struct gui_data);
    memset(inst, 0, sizeof(*inst));
    inst->alt_keycode = -1;            /* this one needs _not_ to be zero */
    inst->busy_status = BUSY_NOT;
    inst->conf = conf_new();
    inst->wintitle = inst->icontitle = NULL;
    inst->quit_fn_scheduled = FALSE;
    inst->idle_fn_scheduled = FALSE;
    inst->drawtype = DRAWTYPE_DEFAULT;

    /* defer any child exit handling until we're ready to deal with
     * it */
    block_signal(SIGCHLD, 1);

    inst->progname = argv[0];
    /*
     * Copy the original argv before letting gtk_init fiddle with
     * it. It will be required later.
     */
    {
        int i, oldargc;
        inst->gtkargvstart = snewn(argc-1, char *);
        for (i = 1; i < argc; i++)
            inst->gtkargvstart[i-1] = dupstr(argv[i]);
        oldargc = argc;
        gtk_init(&argc, &argv);
        inst->ngtkargs = oldargc - argc;
    }

    if (argc > 1 && !strncmp(argv[1], "---", 3)) {
        read_dupsession_data(inst, inst->conf, argv[1]);
        /* Splatter this argument so it doesn't clutter a ps listing */
        smemclr(argv[1], strlen(argv[1]));
    } else {
        /* By default, we bring up the config dialog, rather than launching
         * a session. This gets set to TRUE if something happens to change
         * that (e.g., a hostname is specified on the command-line). */
        int allow_launch = FALSE;
        if (do_cmdline(argc, argv, 0, &allow_launch, inst, inst->conf))
            exit(1);                   /* pre-defaults pass to get -class */
        do_defaults(NULL, inst->conf);
        if (do_cmdline(argc, argv, 1, &allow_launch, inst, inst->conf))
            exit(1);                   /* post-defaults, do everything */

        cmdline_run_saved(inst->conf);

        if (loaded_session)
            allow_launch = TRUE;

        if ((!allow_launch || !conf_launchable(inst->conf)) &&
            !cfgbox(inst->conf))
            exit(0);                   /* config box hit Cancel */
    }

    if (!compound_text_atom)
        compound_text_atom = gdk_atom_intern("COMPOUND_TEXT", FALSE);
    if (!utf8_string_atom)
        utf8_string_atom = gdk_atom_intern("UTF8_STRING", FALSE);

    inst->area = gtk_drawing_area_new();

#if GTK_CHECK_VERSION(2,0,0)
    inst->imc = gtk_im_multicontext_new();
#endif

    {
        char *errmsg = setup_fonts_ucs(inst);
        if (errmsg) {
            fprintf(stderr, "%s: %s\n", appname, errmsg);
            exit(1);
        }
    }
    init_cutbuffers();

    inst->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    {
        const char *winclass = conf_get_str(inst->conf, CONF_winclass);
        if (*winclass)
            gtk_window_set_wmclass(GTK_WINDOW(inst->window),
                                   winclass, winclass);
    }

    /*
     * Set up the colour map.
     */
    palette_reset(inst);

    inst->width = conf_get_int(inst->conf, CONF_width);
    inst->height = conf_get_int(inst->conf, CONF_height);
    cache_conf_values(inst);

    {
        int w = inst->font_width * inst->width + 2*inst->window_border;
        int h = inst->font_height * inst->height + 2*inst->window_border;
#if GTK_CHECK_VERSION(2,0,0)
        gtk_widget_set_size_request(inst->area, w, h);
#else
        gtk_drawing_area_size(GTK_DRAWING_AREA(inst->area), w, h);
#endif
    }
    inst->sbar_adjust = GTK_ADJUSTMENT(gtk_adjustment_new(0,0,0,0,0,0));
    inst->sbar = gtk_vscrollbar_new(inst->sbar_adjust);
    inst->hbox = GTK_BOX(gtk_hbox_new(FALSE, 0));
    /*
     * We always create the scrollbar; it remains invisible if
     * unwanted, so we can pop it up quickly if it suddenly becomes
     * desirable.
     */
    if (conf_get_int(inst->conf, CONF_scrollbar_on_left))
        gtk_box_pack_start(inst->hbox, inst->sbar, FALSE, FALSE, 0);
    gtk_box_pack_start(inst->hbox, inst->area, TRUE, TRUE, 0);
    if (!conf_get_int(inst->conf, CONF_scrollbar_on_left))
        gtk_box_pack_start(inst->hbox, inst->sbar, FALSE, FALSE, 0);

    gtk_container_add(GTK_CONTAINER(inst->window), GTK_WIDGET(inst->hbox));

    set_geom_hints(inst);

    gtk_widget_show(inst->area);
    if (conf_get_int(inst->conf, CONF_scrollbar))
        gtk_widget_show(inst->sbar);
    else
        gtk_widget_hide(inst->sbar);
    gtk_widget_show(GTK_WIDGET(inst->hbox));

#if GTK_CHECK_VERSION(2,0,0)
    if (inst->geometry) {
        gtk_window_parse_geometry(GTK_WINDOW(inst->window), inst->geometry);
    }
#else
    if (inst->gotpos) {
        int x = inst->xpos, y = inst->ypos;
        GtkRequisition req;
        gtk_widget_size_request(GTK_WIDGET(inst->window), &req);
        if (inst->gravity & 1) x += gdk_screen_width() - req.width;
        if (inst->gravity & 2) y += gdk_screen_height() - req.height;
        gtk_window_set_position(GTK_WINDOW(inst->window), GTK_WIN_POS_NONE);
        gtk_widget_set_uposition(GTK_WIDGET(inst->window), x, y);
    }
#endif

    g_signal_connect(G_OBJECT(inst->window), "destroy",
                     G_CALLBACK(destroy), inst);
    g_signal_connect(G_OBJECT(inst->window), "delete_event",
                     G_CALLBACK(delete_window), inst);
    g_signal_connect(G_OBJECT(inst->window), "key_press_event",
                     G_CALLBACK(key_event), inst);
    g_signal_connect(G_OBJECT(inst->window), "key_release_event",
                     G_CALLBACK(key_event), inst);
    g_signal_connect(G_OBJECT(inst->window), "focus_in_event",
                     G_CALLBACK(focus_event), inst);
    g_signal_connect(G_OBJECT(inst->window), "focus_out_event",
                     G_CALLBACK(focus_event), inst);
    g_signal_connect(G_OBJECT(inst->area), "configure_event",
                     G_CALLBACK(configure_area), inst);
    g_signal_connect(G_OBJECT(inst->area), "expose_event",
                     G_CALLBACK(expose_area), inst);
    g_signal_connect(G_OBJECT(inst->area), "button_press_event",
                     G_CALLBACK(button_event), inst);
    g_signal_connect(G_OBJECT(inst->area), "button_release_event",
                     G_CALLBACK(button_event), inst);
#if GTK_CHECK_VERSION(2,0,0)
    g_signal_connect(G_OBJECT(inst->area), "scroll_event",
                     G_CALLBACK(scroll_event), inst);
#endif
    g_signal_connect(G_OBJECT(inst->area), "motion_notify_event",
                     G_CALLBACK(motion_event), inst);
    g_signal_connect(G_OBJECT(inst->area), "selection_received",
                     G_CALLBACK(selection_received), inst);
    g_signal_connect(G_OBJECT(inst->area), "selection_get",
                     G_CALLBACK(selection_get), inst);
    g_signal_connect(G_OBJECT(inst->area), "selection_clear_event",
                     G_CALLBACK(selection_clear), inst);
#if GTK_CHECK_VERSION(2,0,0)
    g_signal_connect(G_OBJECT(inst->imc), "commit",
                     G_CALLBACK(input_method_commit_event), inst);
#endif
    if (conf_get_int(inst->conf, CONF_scrollbar))
        g_signal_connect(G_OBJECT(inst->sbar_adjust), "value_changed",
                         G_CALLBACK(scrollbar_moved), inst);
    gtk_widget_add_events(GTK_WIDGET(inst->area),
                          GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK |
                          GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
                          GDK_POINTER_MOTION_MASK | GDK_BUTTON_MOTION_MASK);

    {
        extern const char *const *const main_icon[];
        extern const int n_main_icon;
        set_window_icon(inst->window, main_icon, n_main_icon);
    }

    gtk_widget_show(inst->window);

    set_window_background(inst);

    /*
     * Set up the Ctrl+rightclick context menu.
     */
    {
        GtkWidget *menuitem;
        char *s;
        extern const int use_event_log, new_session, saved_sessions;

        inst->menu = gtk_menu_new();

#define MKMENUITEM(title, func) do                                      \
        {                                                               \
            menuitem = gtk_menu_item_new_with_label(title);             \
            gtk_container_add(GTK_CONTAINER(inst->menu), menuitem);     \
            gtk_widget_show(menuitem);                                  \
            g_signal_connect(G_OBJECT(menuitem), "activate",            \
                             G_CALLBACK(func), inst);                   \
        } while (0)

#define MKSUBMENU(title) do                                             \
        {                                                               \
            menuitem = gtk_menu_item_new_with_label(title);             \
            gtk_container_add(GTK_CONTAINER(inst->menu), menuitem);     \
            gtk_widget_show(menuitem);                                  \
        } while (0)

#define MKSEP() do                                                      \
        {                                                               \
            menuitem = gtk_menu_item_new();                             \
            gtk_container_add(GTK_CONTAINER(inst->menu), menuitem);     \
            gtk_widget_show(menuitem);                                  \
        } while (0)

        if (new_session)
            MKMENUITEM("New Session...", new_session_menuitem);
        MKMENUITEM("Restart Session", restart_session_menuitem);
        inst->restartitem = menuitem;
        gtk_widget_set_sensitive(inst->restartitem, FALSE);
        MKMENUITEM("Duplicate Session", dup_session_menuitem);
        if (saved_sessions) {
            inst->sessionsmenu = gtk_menu_new();
            /* sessionsmenu will be updated when it's invoked */
            /* XXX is this the right way to do dynamic menus in Gtk? */
            MKMENUITEM("Saved Sessions", update_savedsess_menu);
            gtk_menu_item_set_submenu(GTK_MENU_ITEM(menuitem),
                                      inst->sessionsmenu);
        }
        MKSEP();
        MKMENUITEM("Change Settings...", change_settings_menuitem);
        MKSEP();
        if (use_event_log)
            MKMENUITEM("Event Log", event_log_menuitem);
        MKSUBMENU("Special Commands");
        inst->specialsmenu = gtk_menu_new();
        gtk_menu_item_set_submenu(GTK_MENU_ITEM(menuitem), inst->specialsmenu);
        inst->specialsitem1 = menuitem;
        MKSEP();
        inst->specialsitem2 = menuitem;
        gtk_widget_hide(inst->specialsitem1);
        gtk_widget_hide(inst->specialsitem2);
        MKMENUITEM("Clear Scrollback", clear_scrollback_menuitem);
        MKMENUITEM("Reset Terminal", reset_terminal_menuitem);
        MKMENUITEM("Copy All", copy_all_menuitem);
        MKSEP();
        s = dupcat("About ", appname, NULL);
        MKMENUITEM(s, about_menuitem);
        sfree(s);
#undef MKMENUITEM
#undef MKSUBMENU
#undef MKSEP
    }

    inst->textcursor = make_mouse_ptr(inst, GDK_XTERM);
    inst->rawcursor = make_mouse_ptr(inst, GDK_LEFT_PTR);
    inst->waitcursor = make_mouse_ptr(inst, GDK_WATCH);
    inst->blankcursor = make_mouse_ptr(inst, -1);
    inst->currcursor = inst->textcursor;
    show_mouseptr(inst, 1);

    inst->eventlogstuff = eventlogstuff_new();

    request_callback_notifications(notify_toplevel_callback, inst);

    inst->term = term_init(inst->conf, &inst->ucsdata, inst);
    inst->logctx = log_init(inst, inst->conf);
    term_provide_logctx(inst->term, inst->logctx);

    uxsel_init();

    term_size(inst->term, inst->height, inst->width,
              conf_get_int(inst->conf, CONF_savelines));

    start_backend(inst);

    ldisc_echoedit_update(inst->ldisc);     /* cause ldisc to notice changes */

    /* now we're reday to deal with the child exit handler being
     * called */
    block_signal(SIGCHLD, 0);

    /*
     * Block SIGPIPE: if we attempt Duplicate Session or similar
     * and it falls over in some way, we certainly don't want
     * SIGPIPE terminating the main pterm/PuTTY. Note that we do
     * this _after_ (at least pterm) forks off its child process,
     * since the child wants SIGPIPE handled in the usual way.
     */
    block_signal(SIGPIPE, 1);

    inst->exited = FALSE;

    gtk_main();

    return 0;
}