Another go at fixing 131

[sxemacs] / src / events / events.c

/* Events: printing them, converting them to and from characters.
   Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
   Copyright (C) 1994, 1995 Board of Trustees, University of Illinois.

This file is part of SXEmacs

SXEmacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

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

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>. */


/* Synched up with: Not in FSF. */

/* This file has been Mule-ized. */

#include <config.h>
#include "lisp.h"
#include "buffer.h"
#include "ui/console.h"
#include "ui/TTY/console-tty.h"         /* for stuff in
                                           character_to_event. needs
                                           refactoring */
#include "ui/device.h"
#include "ui/X11/console-x.h"   /* for x_event_name prototype in
                                   format_event_object. Needs refactoring */
#include "extents.h"            /* Just for the EXTENTP abort check... */
#define INCLUDE_EVENTS_H_PRIVATE_SPHERE
#include "events.h"
#include "ui/frame.h"
#include "ui/glyphs.h"
#include "ui/keymap.h"          /* for key_desc_list_to_event() */
#include "ui/redisplay.h"
#include "ui/window.h"
#include "events-mod.h"

/* Where old events go when they are explicitly deallocated.
   The event chain here is cut loose before GC, so these will be freed
   eventually.
 */
#if !defined HAVE_BDWGC || !defined EF_USE_BDWGC
static Lisp_Object Vevent_resource;
#ifdef EF_USE_ASYNEQ
static sxe_mutex_t Vevent_resource_mtx;
#endif  /* EF_USE_ASYNEQ */
#endif  /* BDWGC */

Lisp_Object Qeventp;
Lisp_Object Qevent_live_p;
Lisp_Object Qkey_press_event_p;
Lisp_Object Qbutton_event_p;
Lisp_Object Qmouse_event_p;
Lisp_Object Qprocess_event_p;

Lisp_Object Qkey_press, Qbutton_press, Qbutton_release, Qmisc_user;
Lisp_Object Qascii_character;

EXFUN(Fevent_x_pixel, 1);
EXFUN(Fevent_y_pixel, 1);

\f
#if defined HAVE_BDWGC && defined EF_USE_BDWGC
static inline void
init_Vevent_resource(void)
{
        return;
}

static inline void
fini_Vevent_resource(void)
{
        return;
}

static inline void
lock_Vevent_resource(void)
{
        return;
}

static inline void
unlock_Vevent_resource(void)
{
        return;
}
#elif defined EF_USE_ASYNEQ
static inline void
init_Vevent_resource(void)
{
        Vevent_resource = Qnil;
        SXE_MUTEX_INIT(&Vevent_resource_mtx);
}

static inline void
fini_Vevent_resource(void)
{
        SXE_MUTEX_FINI(&Vevent_resource_mtx);
        Vevent_resource = Qnil;
}

static inline void
lock_Vevent_resource(void)
{
        SXE_MUTEX_LOCK(&Vevent_resource_mtx);
}

static inline void
unlock_Vevent_resource(void)
{
        SXE_MUTEX_UNLOCK(&Vevent_resource_mtx);
}

#else
static inline void
init_Vevent_resource(void)
{
        Vevent_resource = Qnil;
}

static inline void
fini_Vevent_resource(void)
{
        Vevent_resource = Qnil;
}

static inline void
lock_Vevent_resource(void)
{
}

static inline void
unlock_Vevent_resource(void)
{
}
#endif

/* #### Ad-hoc hack.  Should be part of define_lrecord_implementation */
void clear_event_resource(void)
{
#if !defined HAVE_BDWGC || !defined EF_USE_BDWGC
        lock_Vevent_resource();
        Vevent_resource = Qnil;
        unlock_Vevent_resource();
#endif  /* !BDWGC */
}

/* Make sure we lose quickly if we try to use this event */
static void deinitialize_event(Lisp_Object ev)
{
        Lisp_Event *event = XEVENT(ev);

        for (sxe_index_t i = 0; i < (sizeof(Lisp_Event) / sizeof(int)); i++) {
                ((int*)event)[i] = 0xdeadbeef;
        }
        event->event_type = dead_event;
        event->channel = Qnil;
        set_lheader_implementation(&event->lheader, &lrecord_event);
        XSET_EVENT_NEXT(ev, Qnil);
}

/* Set everything to zero or nil so that it's predictable. */
void zero_event(Lisp_Event * e)
{
        xzero(*e);
        set_lheader_implementation(&e->lheader, &lrecord_event);
        e->event_type = empty_event;
        e->next = Qnil;
        e->channel = Qnil;
}

static Lisp_Object mark_event(Lisp_Object obj)
{
        Lisp_Event *event = XEVENT(obj);

        switch (event->event_type) {
        case key_press_event:
                mark_object(event->event.key.keysym);
                break;
        case process_event:
                mark_object(event->event.process.process);
                break;
        case timeout_event:
                mark_object(event->event.timeout.function);
                mark_object(event->event.timeout.object);
                break;
        case eval_event:
        case misc_user_event:
                mark_object(event->event.eval.function);
                mark_object(event->event.eval.object);
                break;
        case magic_eval_event:
                mark_object(event->event.magic_eval.object);
                break;
#ifdef EF_USE_ASYNEQ
        case work_started_event:
                if (event->event.work_started.job)
                        mark_object(event->event.work_started.job);
                break;
        case work_finished_event:
                if (event->event.work_finished.job)
                        mark_object(event->event.work_finished.job);
                break;
        case eaten_myself_event:
#endif
        case button_press_event:
        case button_release_event:
        case pointer_motion_event:
        case magic_event:
        case empty_event:
        case dead_event:
                break;
        default:
                abort();
        }
        mark_object(event->channel);
        return event->next;
}

static void
print_event_1(const char *str, Lisp_Object obj, Lisp_Object printcharfun)
{
        char buf[255];
        write_c_string(str, printcharfun);
        format_event_object(buf, XEVENT(obj), 0);
        write_c_string(buf, printcharfun);
}

static void
print_event(Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
{
        if (print_readably)
                error("Printing unreadable object #<event>");

        switch (XEVENT(obj)->event_type) {
        case key_press_event:
                print_event_1("#<keypress-event ", obj, printcharfun);
                break;
        case button_press_event:
                print_event_1("#<buttondown-event ", obj, printcharfun);
                break;
        case button_release_event:
                print_event_1("#<buttonup-event ", obj, printcharfun);
                break;
        case magic_event:
        case magic_eval_event:
                print_event_1("#<magic-event ", obj, printcharfun);
                break;
        case pointer_motion_event: {
                Lisp_Object Vx, Vy;
                Vx = Fevent_x_pixel(obj);
                assert(INTP(Vx));
                Vy = Fevent_y_pixel(obj);
                assert(INTP(Vy));
                write_fmt_str(printcharfun, "#<motion-event %ld, %ld", (long)XINT(Vx),
                              (long)XINT(Vy));
                break;
        }
        case process_event:
                write_c_string("#<process-event ", printcharfun);
                print_internal(XEVENT(obj)->event.process.process, printcharfun,
                               1);
                break;
        case timeout_event:
                write_c_string("#<timeout-event ", printcharfun);
                print_internal(XEVENT(obj)->event.timeout.object, printcharfun,
                               1);
                break;
        case empty_event:
                write_c_string("#<empty-event", printcharfun);
                break;
        case misc_user_event:
                write_c_string("#<misc-user-event (", printcharfun);
                print_internal(XEVENT(obj)->event.misc.function, printcharfun,
                               1);
                write_c_string(" ", printcharfun);
                print_internal(XEVENT(obj)->event.misc.object, printcharfun, 1);
                write_c_string(")", printcharfun);
                break;
        case eval_event:
                write_c_string("#<eval-event (", printcharfun);
                print_internal(XEVENT(obj)->event.eval.function, printcharfun,
                               1);
                write_c_string(" ", printcharfun);
                print_internal(XEVENT(obj)->event.eval.object, printcharfun, 1);
                write_c_string(")", printcharfun);
                break;
        case dead_event:
                write_c_string("#<DEALLOCATED-EVENT", printcharfun);
                break;
#ifdef EF_USE_ASYNEQ
        case eaten_myself_event:
                write_c_string("#<worker-suidice-event", printcharfun);
                break;
        case work_started_event:
                write_c_string("#<worker-work-started-event", printcharfun);
                break;
        case work_finished_event:
                write_c_string("#<worker-work-finished-event", printcharfun);
                break;
#endif  /* EF_USE_ASYNEQ */
        default:
                write_c_string("#<UNKNOWN-EVENT-TYPE", printcharfun);
                break;
        }
        write_c_string(">", printcharfun);
}

static int
event_equal(Lisp_Object obj1, Lisp_Object obj2, int depth)
{
        Lisp_Event *e1 = XEVENT(obj1);
        Lisp_Event *e2 = XEVENT(obj2);

        if (e1->event_type != e2->event_type)
                return 0;
        if (!EQ(e1->channel, e2->channel))
                return 0;
        /*  if (e1->timestamp != e2->timestamp) return 0; */
        switch (e1->event_type) {
        default:
                abort();

        case process_event:
                return EQ(e1->event.process.process, e2->event.process.process);

        case timeout_event:
                return (internal_equal(e1->event.timeout.function,
                                       e2->event.timeout.function, 0) &&
                        internal_equal(e1->event.timeout.object,
                                       e2->event.timeout.object, 0));

        case key_press_event:
                return (EQ(e1->event.key.keysym, e2->event.key.keysym) &&
                        (e1->event.key.modifiers == e2->event.key.modifiers));

        case button_press_event:
        case button_release_event:
                return (e1->event.button.button == e2->event.button.button &&
                        e1->event.button.modifiers ==
                        e2->event.button.modifiers);

        case pointer_motion_event:
                return (e1->event.motion.x == e2->event.motion.x &&
                        e1->event.motion.y == e2->event.motion.y);

        case misc_user_event:
                return (internal_equal(e1->event.eval.function,
                                       e2->event.eval.function, 0) &&
                        internal_equal(e1->event.eval.object,
                                       e2->event.eval.object, 0) &&
                        /* is this really needed for equality
                           or is x and y also important? */
                        e1->event.misc.button == e2->event.misc.button &&
                        e1->event.misc.modifiers == e2->event.misc.modifiers);

        case eval_event:
                return (internal_equal(e1->event.eval.function,
                                       e2->event.eval.function, 0) &&
                        internal_equal(e1->event.eval.object,
                                       e2->event.eval.object, 0));

        case magic_eval_event:
                return (e1->event.magic_eval.internal_function ==
                        e2->event.magic_eval.internal_function &&
                        internal_equal(e1->event.magic_eval.object,
                                       e2->event.magic_eval.object, 0));

        case magic_event: {
                struct console *con =
                        XCONSOLE(CDFW_CONSOLE(e1->channel));

#ifdef HAVE_X_WINDOWS
                if (CONSOLE_X_P(con))
                        return (e1->event.magic.underlying_x_event.xany.
                                serial ==
                                e2->event.magic.underlying_x_event.xany.
                                serial);
#endif
#ifdef HAVE_TTY
                if (CONSOLE_TTY_P(con))
                        return (e1->event.magic.underlying_tty_event ==
                                e2->event.magic.underlying_tty_event);
#endif
                abort();
                return 1;       /* not reached */
        }

#ifdef EF_USE_ASYNEQ
                /* worker thread mumbo jumbo is never equal */
        case eaten_myself_event:
        case work_started_event:
        case work_finished_event:
                return 0;
#endif  /* EF_USE_ASYNEQ */

                /* Empty and deallocated events are equal. */
        case empty_event:
        case dead_event:
                return 1;
        }
}

static unsigned long
event_hash(Lisp_Object obj, int depth)
{
        Lisp_Event *e = XEVENT(obj);
        unsigned long hash;

        hash = HASH2(e->event_type, LISP_HASH(e->channel));
        switch (e->event_type) {
        case process_event:
                return HASH2(hash, LISP_HASH(e->event.process.process));

        case timeout_event:
                return HASH3(hash,
                             internal_hash(e->event.timeout.function,
                                           depth + 1),
                             internal_hash(e->event.timeout.object, depth + 1));

        case key_press_event:
                return HASH3(hash, LISP_HASH(e->event.key.keysym),
                             e->event.key.modifiers);

        case button_press_event:
        case button_release_event:
                return HASH3(hash, e->event.button.button,
                             e->event.button.modifiers);

        case pointer_motion_event:
                return HASH3(hash, e->event.motion.x, e->event.motion.y);

        case misc_user_event:
                return HASH5(hash,
                             internal_hash(e->event.misc.function, depth + 1),
                             internal_hash(e->event.misc.object, depth + 1),
                             e->event.misc.button, e->event.misc.modifiers);

        case eval_event:
                return HASH3(hash,
                             internal_hash(e->event.eval.function, depth + 1),
                             internal_hash(e->event.eval.object, depth + 1));

        case magic_eval_event:
                return HASH3(hash,
                             (unsigned long)e->event.magic_eval.
                             internal_function,
                             internal_hash(e->event.magic_eval.object,
                                           depth + 1));

        case magic_event: {
                struct console *con =
                        XCONSOLE(CDFW_CONSOLE(EVENT_CHANNEL(e)));
#ifdef HAVE_X_WINDOWS
                if (CONSOLE_X_P(con))
                        return HASH2(hash,
                                     e->event.magic.underlying_x_event.
                                     xany.serial);
#endif
#ifdef HAVE_TTY
                if (CONSOLE_TTY_P(con))
                        return HASH2(hash,
                                     e->event.magic.
                                     underlying_tty_event);
#endif
                abort();
                return 0;
        }

#ifdef EF_USE_ASYNEQ
        case eaten_myself_event:
        case work_started_event:
        case work_finished_event:
                return (long unsigned int)obj;
#endif  /* EF_USE_ASYNEQ */

        case empty_event:
        case dead_event:
                return hash;

        default:
                abort();
        }

        return 0;               /* unreached */
}

DEFINE_BASIC_LRECORD_IMPLEMENTATION("event", event,
                                    mark_event, print_event, 0, event_equal,
                                    event_hash, 0, Lisp_Event);
\f
Lisp_Object
make_empty_event(void)
{
        Lisp_Object event = Qnil;
        Lisp_Event *e;

#if defined HAVE_BDWGC && defined EF_USE_BDWGC
/* just allocate */
        event = allocate_event();

#else  /* !BDWGC */
        struct gcpro gcpro1;

        GCPRO1(event);
        lock_Vevent_resource();
        if (!NILP(Vevent_resource)) {
                event = Vevent_resource;
                Vevent_resource = XEVENT_NEXT(event);
        } else {
                event = allocate_event();
        }
        unlock_Vevent_resource();
#endif  /* BDWGC */
        e = XEVENT(event);
        zero_event(e);

        e->event_type = empty_event;
        e->next = Qnil;
        EVENT_CHANNEL(e) = Qnil;

        UNGCPRO;
        return event;
}

sxe_event_t
make_noseeum_event(emacs_event_type event_type)
{
        sxe_event_t res = xnew_and_zero(Lisp_Event);

        res->event_type = event_type;
        res->next = Qnil;
        EVENT_CHANNEL(res) = Qnil;
        return res;
}

DEFUN("make-event", Fmake_event, 0, 2, 0,       /*
Return a new event of type TYPE, with properties described by PLIST.

TYPE is a symbol, either `empty', `key-press', `button-press',
`button-release', `misc-user' or `motion'.  If TYPE is nil, it
defaults to `empty'.

PLIST is a property list, the properties being compatible to those
returned by `event-properties'.  The following properties are
allowed:

channel   -- The event channel, a frame or a console.  For
button-press, button-release, misc-user and motion events,
this must be a frame.  For key-press events, it must be
a console.  If channel is unspecified, it will be set to
the selected frame or selected console, as appropriate.
key               -- The event key, a symbol or character.  Allowed only for
keypress events.
button            -- The event button, integer 1, 2 or 3.  Allowed for
button-press, button-release and misc-user events.
modifiers -- The event modifiers, a list of modifier symbols.  Allowed
for key-press, button-press, button-release, motion and
misc-user events.
function       -- Function. Allowed for misc-user events only.
object         -- An object, function's parameter. Allowed for misc-user
events only.
x         -- The event X coordinate, an integer.  This is relative
to the left of CHANNEL's root window.  Allowed for
motion, button-press, button-release and misc-user events.
y         -- The event Y coordinate, an integer.  This is relative
to the top of CHANNEL's root window.  Allowed for
motion, button-press, button-release and misc-user events.
timestamp -- The event timestamp, a non-negative integer.  Allowed for
all types of events.  If unspecified, it will be set to 0
by default.

For event type `empty', PLIST must be nil.
`button-release', or `motion'.  If TYPE is left out, it defaults to
`empty'.
PLIST is a list of properties, as returned by `event-properties'.  Not
all properties are allowed for all kinds of events, and some are
required.

WARNING: the event object returned may be a reused one; see the function
`deallocate-event'.
*/
      (type, plist))
{
        Lisp_Object event = Qnil;
        Lisp_Event *e;
        EMACS_INT coord_x = 0, coord_y = 0;
        struct gcpro gcpro1;

        if (NILP(type)) {
                /* common case */
                return make_empty_event();
        }

#if defined HAVE_BDWGC && defined EF_USE_BDWGC
        event = allocate_event();

#else  /* !BDWGC */
        GCPRO1(event);
        lock_Vevent_resource();
        if (!NILP(Vevent_resource)) {
                event = Vevent_resource;
                Vevent_resource = XEVENT_NEXT(event);
        } else {
                event = allocate_event();
        }
        unlock_Vevent_resource();
#endif  /* BDWGC */
        e = XEVENT(event);
        zero_event(e);

        if (EQ(type, Qempty)) {
                /* For empty event, we return immediately, without processing
                   PLIST.  In fact, processing PLIST would be wrong, because the
                   sanitizing process would fill in the properties
                   (e.g. CHANNEL), which we don't want in empty events.  */
                e->event_type = empty_event;
                if (!NILP(plist))
                        syntax_error("Cannot set properties of empty event",
                                     plist);
                UNGCPRO;
                return event;
        } else if (EQ(type, Qkey_press)) {
                e->event_type = key_press_event;
                e->event.key.keysym = Qunbound;
        } else if (EQ(type, Qbutton_press)) {
                e->event_type = button_press_event;
        } else if (EQ(type, Qbutton_release)) {
                e->event_type = button_release_event;
        } else if (EQ(type, Qmotion)) {
                e->event_type = pointer_motion_event;
        } else if (EQ(type, Qmisc_user)) {
                e->event_type = misc_user_event;
                e->event.eval.function = e->event.eval.object = Qnil;
        } else {
                /* Not allowed:
                   Qprocess, Qtimeout, Qmagic, Qeval, Qmagic_eval.  */
                invalid_argument("Invalid event type", type);
        }

        EVENT_CHANNEL(e) = Qnil;

        plist = Fcopy_sequence(plist);
        Fcanonicalize_plist(plist, Qnil);

#define WRONG_EVENT_TYPE_FOR_PROPERTY(event_type, prop)                 \
        syntax_error_2 ("Invalid property for event type", prop, event_type)

        {
                EXTERNAL_PROPERTY_LIST_LOOP_3(keyword, value, plist) {
                        if (EQ(keyword, Qchannel)) {
                                if (e->event_type == key_press_event) {
                                        if (!CONSOLEP(value))
                                                value =
                                                    wrong_type_argument
                                                    (Qconsolep, value);
                                } else {
                                        if (!FRAMEP(value))
                                                value =
                                                    wrong_type_argument(Qframep,
                                                                        value);
                                }
                                EVENT_CHANNEL(e) = value;
                        } else if (EQ(keyword, Qkey)) {
                                switch (e->event_type) {
                                case key_press_event:
                                        if (!SYMBOLP(value) && !CHARP(value))
                                                syntax_error
                                                    ("Invalid event key",
                                                     value);
                                        e->event.key.keysym = value;
                                        break;

                                        /* rest goes here */
                                case empty_event:
                                case button_press_event:
                                case button_release_event:
                                case pointer_motion_event:
                                case process_event:
                                case timeout_event:
                                case magic_event:
                                case magic_eval_event:
                                case eval_event:
                                case misc_user_event:
#ifdef EF_USE_ASYNEQ
                                case eaten_myself_event:
                                case work_started_event:
                                case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
                                case dead_event:
                                default:
                                        WRONG_EVENT_TYPE_FOR_PROPERTY(type,
                                                                      keyword);
                                        break;
                                }
                        } else if (EQ(keyword, Qbutton)) {
                                CHECK_NATNUM(value);
                                check_int_range(XINT(value), 0, 7);

                                switch (e->event_type) {
                                case button_press_event:
                                case button_release_event:
                                        e->event.button.button = XINT(value);
                                        break;
                                case misc_user_event:
                                        e->event.misc.button = XINT(value);
                                        break;

                                        /* and the rest of that lot */
                                case empty_event:
                                case key_press_event:
                                case pointer_motion_event:
                                case process_event:
                                case timeout_event:
                                case magic_event:
                                case magic_eval_event:
                                case eval_event:
#ifdef EF_USE_ASYNEQ
                                case eaten_myself_event:
                                case work_started_event:
                                case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
                                case dead_event:
                                default:
                                        WRONG_EVENT_TYPE_FOR_PROPERTY(type,
                                                                      keyword);
                                        break;
                                }
                        } else if (EQ(keyword, Qmodifiers)) {
                                int modifiers = 0;

                                EXTERNAL_LIST_LOOP_2(sym, value) {
                                        if (EQ(sym, Qcontrol))
                                                modifiers |= XEMACS_MOD_CONTROL;
                                        else if (EQ(sym, Qmeta))
                                                modifiers |= XEMACS_MOD_META;
                                        else if (EQ(sym, Qsuper))
                                                modifiers |= XEMACS_MOD_SUPER;
                                        else if (EQ(sym, Qhyper))
                                                modifiers |= XEMACS_MOD_HYPER;
                                        else if (EQ(sym, Qalt))
                                                modifiers |= XEMACS_MOD_ALT;
                                        else if (EQ(sym, Qsymbol))
                                                modifiers |= XEMACS_MOD_ALT;
                                        else if (EQ(sym, Qshift))
                                                modifiers |= XEMACS_MOD_SHIFT;
                                        else if (EQ(sym, Qbutton1))
                                                modifiers |= XEMACS_MOD_BUTTON1;
                                        else if (EQ(sym, Qbutton2))
                                                modifiers |= XEMACS_MOD_BUTTON2;
                                        else if (EQ(sym, Qbutton3))
                                                modifiers |= XEMACS_MOD_BUTTON3;
                                        else if (EQ(sym, Qbutton4))
                                                modifiers |= XEMACS_MOD_BUTTON4;
                                        else if (EQ(sym, Qbutton5))
                                                modifiers |= XEMACS_MOD_BUTTON5;
                                        else
                                                syntax_error
                                                    ("Invalid key modifier",
                                                     sym);
                                }

                                switch (e->event_type) {
                                case key_press_event:
                                        e->event.key.modifiers = modifiers;
                                        break;
                                case button_press_event:
                                case button_release_event:
                                        e->event.button.modifiers = modifiers;
                                        break;
                                case pointer_motion_event:
                                        e->event.motion.modifiers = modifiers;
                                        break;
                                case misc_user_event:
                                        e->event.misc.modifiers = modifiers;
                                        break;

                                        /* here come the rest */
                                case empty_event:
                                case process_event:
                                case timeout_event:
                                case magic_event:
                                case magic_eval_event:
                                case eval_event:
#ifdef EF_USE_ASYNEQ
                                case eaten_myself_event:
                                case work_started_event:
                                case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
                                case dead_event:
                                default:
                                        WRONG_EVENT_TYPE_FOR_PROPERTY(type,
                                                                      keyword);
                                        break;
                                }
                        } else if (EQ(keyword, Qx)) {
                                switch (e->event_type) {
                                case pointer_motion_event:
                                case button_press_event:
                                case button_release_event:
                                case misc_user_event:
                                        /* Allow negative values, so we can specify toolbar
                                           positions.  */
                                        CHECK_INT(value);
                                        coord_x = XINT(value);
                                        break;

                                        /* rest goes here */
                                case empty_event:
                                case key_press_event:
                                case process_event:
                                case timeout_event:
                                case magic_event:
                                case magic_eval_event:
                                case eval_event:
#ifdef EF_USE_ASYNEQ
                                case eaten_myself_event:
                                case work_started_event:
                                case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
                                case dead_event:
                                default:
                                        WRONG_EVENT_TYPE_FOR_PROPERTY(type,
                                                                      keyword);
                                        break;
                                }
                        } else if (EQ(keyword, Qy)) {
                                switch (e->event_type) {
                                case pointer_motion_event:
                                case button_press_event:
                                case button_release_event:
                                case misc_user_event:
                                        /* Allow negative values; see above. */
                                        CHECK_INT(value);
                                        coord_y = XINT(value);
                                        break;

                                        /* et la reste */
                                case empty_event:
                                case key_press_event:
                                case process_event:
                                case timeout_event:
                                case magic_event:
                                case magic_eval_event:
                                case eval_event:
#ifdef EF_USE_ASYNEQ
                                case eaten_myself_event:
                                case work_started_event:
                                case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
                                case dead_event:
                                default:
                                        WRONG_EVENT_TYPE_FOR_PROPERTY(type,
                                                                      keyword);
                                        break;
                                }
                        } else if (EQ(keyword, Qtimestamp)) {
                                CHECK_NATNUM(value);
                                e->timestamp = XINT(value);
                        } else if (EQ(keyword, Qfunction)) {
                                switch (e->event_type) {
                                case misc_user_event:
                                        e->event.eval.function = value;
                                        break;

                                        /* rest goes here */
                                case empty_event:
                                case key_press_event:
                                case button_press_event:
                                case button_release_event:
                                case pointer_motion_event:
                                case process_event:
                                case timeout_event:
                                case magic_event:
                                case magic_eval_event:
                                case eval_event:
#ifdef EF_USE_ASYNEQ
                                case eaten_myself_event:
                                case work_started_event:
                                case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
                                case dead_event:
                                default:
                                        WRONG_EVENT_TYPE_FOR_PROPERTY(type,
                                                                      keyword);
                                        break;
                                }
                        } else if (EQ(keyword, Qobject)) {
                                switch (e->event_type) {
                                case misc_user_event:
                                        e->event.eval.object = value;
                                        break;

                                        /* rest goes here */
                                case empty_event:
                                case key_press_event:
                                case button_press_event:
                                case button_release_event:
                                case pointer_motion_event:
                                case process_event:
                                case timeout_event:
                                case magic_event:
                                case magic_eval_event:
                                case eval_event:
#ifdef EF_USE_ASYNEQ
                                case eaten_myself_event:
                                case work_started_event:
                                case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
                                case dead_event:
                                default:
                                        WRONG_EVENT_TYPE_FOR_PROPERTY(type,
                                                                      keyword);
                                        break;
                                }
                        } else
                                syntax_error_2("Invalid property", keyword,
                                               value);
                }
        }

        /* Insert the channel, if missing. */
        if (NILP(EVENT_CHANNEL(e))) {
                if (e->event_type == key_press_event)
                        EVENT_CHANNEL(e) = Vselected_console;
                else
                        EVENT_CHANNEL(e) = Fselected_frame(Qnil);
        }

        /* Fevent_properties, Fevent_x_pixel, etc. work with pixels relative
           to the frame, so we must adjust accordingly.  */
        if (FRAMEP(EVENT_CHANNEL(e))) {
                coord_x +=
                    FRAME_REAL_LEFT_TOOLBAR_WIDTH(XFRAME(EVENT_CHANNEL(e)));
                coord_y +=
                    FRAME_REAL_TOP_TOOLBAR_HEIGHT(XFRAME(EVENT_CHANNEL(e)));

                switch (e->event_type) {
                case pointer_motion_event:
                        e->event.motion.x = coord_x;
                        e->event.motion.y = coord_y;
                        break;
                case button_press_event:
                case button_release_event:
                        e->event.button.x = coord_x;
                        e->event.button.y = coord_y;
                        break;
                case misc_user_event:
                        e->event.misc.x = coord_x;
                        e->event.misc.y = coord_y;
                        break;

                        /* rest goes here */
                case empty_event:
                case key_press_event:
                case process_event:
                case timeout_event:
                case magic_event:
                case magic_eval_event:
                case eval_event:
#ifdef EF_USE_ASYNEQ
                case eaten_myself_event:
                case work_started_event:
                case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
                case dead_event:
                default:
                        abort();
                }
        }

        /* Finally, do some more validation.  */
        switch (e->event_type) {
        case key_press_event:
                if (UNBOUNDP(e->event.key.keysym))
                        syntax_error
                            ("A key must be specified to make a "
                             "keypress event", plist);
                break;
        case button_press_event:
                if (!e->event.button.button)
                        syntax_error
                            ("A button must be specified to make a "
                             "button-press event", plist);
                break;
        case button_release_event:
                if (!e->event.button.button)
                        syntax_error
                            ("A button must be specified to make a "
                             "button-release event", plist);
                break;
        case misc_user_event:
                if (NILP(e->event.misc.function))
                        syntax_error
                            ("A function must be specified to make a "
                             "misc-user event", plist);
                break;

        case empty_event:
        case pointer_motion_event:
        case process_event:
        case timeout_event:
        case magic_event:
        case magic_eval_event:
        case eval_event:
#ifdef EF_USE_ASYNEQ
        case eaten_myself_event:
        case work_started_event:
        case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
        case dead_event:
        default:
                break;
        }

        UNGCPRO;
        return event;
}

DEFUN("deallocate-event", Fdeallocate_event, 1, 1, 0,   /*
Allow the given event structure to be reused.
You MUST NOT use this event object after calling this function with it.
You will lose.  It is not necessary to call this function, as event
objects are garbage-collected like all other objects; however, it may
be more efficient to explicitly deallocate events when you are sure
that it is safe to do so.
*/
      (event))
{
        CHECK_EVENT(event);

        if (XEVENT_TYPE(event) == dead_event)
                error("this event is already deallocated!");

        assert(XEVENT_TYPE(event) <= last_event_type);

#if 0
        {
                int i, len;

                if (EQ(event, Vlast_command_event) ||
                    EQ(event, Vlast_input_event) ||
                    EQ(event, Vunread_command_event))
                        abort();

                len = XVECTOR_LENGTH(Vthis_command_keys);
                for (i = 0; i < len; i++)
                        if (EQ(event, XVECTOR_DATA(Vthis_command_keys)[i]))
                                abort();
                if (!NILP(Vrecent_keys_ring)) {
                        int recent_ring_len = XVECTOR_LENGTH(Vrecent_keys_ring);
                        for (i = 0; i < recent_ring_len; i++)
                                if (EQ
                                    (event, XVECTOR_DATA(Vrecent_keys_ring)[i]))
                                        abort();
                }
        }
#endif                          /* 0 */

#if !defined HAVE_BDWGC || !defined EF_USE_BDWGC
        lock_Vevent_resource();
        assert(!EQ(event, Vevent_resource));
        unlock_Vevent_resource();
#endif  /* !BDWGC */
        deinitialize_event(event);
#if !defined ALLOC_NO_POOLS && !(defined HAVE_BDWGC && defined EF_USE_BDWGC)
        lock_Vevent_resource();
        XSET_EVENT_NEXT(event, Vevent_resource);
        Vevent_resource = event;
        unlock_Vevent_resource();
#endif
        return Qnil;
}

DEFUN("copy-event", Fcopy_event, 1, 2, 0,       /*
Make a copy of the event object EVENT1.
If a second event argument EVENT2 is given, EVENT1 is copied into
EVENT2 and EVENT2 is returned.  If EVENT2 is not supplied (or is nil)
then a new event will be made as with `make-event'.  See also the
function `deallocate-event'.
*/
      (event1, event2))
{
        CHECK_LIVE_EVENT(event1);
        if (NILP(event2))
                event2 = Fmake_event(Qnil, Qnil);
        else {
                CHECK_LIVE_EVENT(event2);
                if (EQ(event1, event2))
                        return signal_simple_continuable_error_2
                            ("copy-event called with `eq' events", event1,
                             event2);
        }

        assert(XEVENT_TYPE(event1) <= last_event_type);
        assert(XEVENT_TYPE(event2) <= last_event_type);

        {
                Lisp_Event *ev2 = XEVENT(event2);
                Lisp_Event *ev1 = XEVENT(event1);

                ev2->event_type = ev1->event_type;
                ev2->channel = ev1->channel;
                ev2->timestamp = ev1->timestamp;
                ev2->event = ev1->event;

                return event2;
        }
}
\f
/* Given a chain of events (or possibly nil), deallocate them all. */

void deallocate_event_chain(Lisp_Object event_chain)
{
        while (!NILP(event_chain)) {
                Lisp_Object next = XEVENT_NEXT(event_chain);
                Fdeallocate_event(event_chain);
                event_chain = next;
        }
}

/* Return the last event in a chain.
   NOTE: You cannot pass nil as a value here!  The routine will
   abort if you do. */

Lisp_Object event_chain_tail(Lisp_Object event_chain)
{
        while (1) {
                Lisp_Object next = XEVENT_NEXT(event_chain);
                if (NILP(next))
                        return event_chain;
                event_chain = next;
        }
}

/* Enqueue a single event onto the end of a chain of events.
   HEAD points to the first event in the chain, TAIL to the last event.
   If the chain is empty, both values should be nil. */

void enqueue_event(Lisp_Object event, Lisp_Object * head, Lisp_Object * tail)
{
        assert(NILP(XEVENT_NEXT(event)));
        assert(!EQ(*tail, event));

        if (!NILP(*tail))
                XSET_EVENT_NEXT(*tail, event);
        else
                *head = event;
        *tail = event;

        assert(!EQ(event, XEVENT_NEXT(event)));
}

/* Remove an event off the head of a chain of events and return it.
   HEAD points to the first event in the chain, TAIL to the last event. */

Lisp_Object dequeue_event(Lisp_Object * head, Lisp_Object * tail)
{
        Lisp_Object event;

        event = *head;
        *head = XEVENT_NEXT(event);
        XSET_EVENT_NEXT(event, Qnil);
        if (NILP(*head))
                *tail = Qnil;
        return event;
}

/* Enqueue a chain of events (or possibly nil) onto the end of another
   chain of events.  HEAD points to the first event in the chain being
   queued onto, TAIL to the last event.  If the chain is empty, both values
   should be nil. */

void
enqueue_event_chain(Lisp_Object event_chain, Lisp_Object * head,
                    Lisp_Object * tail)
{
        if (NILP(event_chain))
                return;

        if (NILP(*head)) {
                *head = event_chain;
                *tail = event_chain;
        } else {
                XSET_EVENT_NEXT(*tail, event_chain);
                *tail = event_chain_tail(event_chain);
        }
}

/* Return the number of events (possibly 0) on an event chain. */

int event_chain_count(Lisp_Object event_chain)
{
        Lisp_Object event;
        int n = 0;

        EVENT_CHAIN_LOOP(event, event_chain) {
                n++;
        }

        return n;
}

/* Find the event before EVENT in an event chain.  This aborts
   if the event is not in the chain. */

Lisp_Object
event_chain_find_previous(Lisp_Object event_chain, Lisp_Object event)
{
        Lisp_Object previous = Qnil;

        while (!NILP(event_chain)) {
                if (EQ(event_chain, event)) {
                        return previous;
                }
                previous = event_chain;
                event_chain = XEVENT_NEXT(event_chain);
        }

        abort();
        return Qnil;
}

Lisp_Object event_chain_nth(Lisp_Object event_chain, int n)
{
        Lisp_Object event;
        EVENT_CHAIN_LOOP(event, event_chain) {
                if (!n) {
                        return event;
                }
                n--;
        }
        return Qnil;
}

Lisp_Object copy_event_chain(Lisp_Object event_chain)
{
        Lisp_Object new_chain = Qnil;
        Lisp_Object new_chain_tail = Qnil;
        Lisp_Object event;

        EVENT_CHAIN_LOOP(event, event_chain) {
                Lisp_Object copy = Fcopy_event(event, Qnil);
                enqueue_event(copy, &new_chain, &new_chain_tail);
        }

        return new_chain;
}
\f
Lisp_Object QKbackspace, QKtab, QKlinefeed, QKreturn, QKescape,
    QKspace, QKdelete;

int command_event_p(Lisp_Object event)
{
        switch (XEVENT_TYPE(event)) {
        case key_press_event:
        case button_press_event:
        case button_release_event:
        case misc_user_event:
                return 1;

        case empty_event:
        case pointer_motion_event:
        case process_event:
        case timeout_event:
        case magic_event:
        case magic_eval_event:
        case eval_event:
#ifdef EF_USE_ASYNEQ
        case eaten_myself_event:
        case work_started_event:
        case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
        case dead_event:
        default:
                return 0;
        }
}

void
character_to_event(Emchar c, Lisp_Event * event, struct console *con,
                   int use_console_meta_flag, int do_backspace_mapping)
{
        Lisp_Object k = Qnil;
        int m = 0;
        if (event->event_type == dead_event)
                error("character-to-event called with a deallocated event!");

#ifndef MULE
        c &= 255;
#endif
        if (c > 127 && c <= 255) {
                int meta_flag = 1;

                if (use_console_meta_flag && CONSOLE_TTY_P(con)) {
                        meta_flag = TTY_FLAGS(con).meta_key;
                }
                switch (meta_flag) {
                case 0: /* ignore top bit; it's parity */
                        c -= 128;
                        break;
                case 1: /* top bit is meta */
                        c -= 128;
                        m = XEMACS_MOD_META;
                        break;
                default:        /* this is a real character */
                        break;
                }
        }
        if (c < ' ')
                c += '@', m |= XEMACS_MOD_CONTROL;
        if (m & XEMACS_MOD_CONTROL) {
                switch (c) {
                case 'I':
                        k = QKtab;
                        m &= ~XEMACS_MOD_CONTROL;
                        break;
                case 'J':
                        k = QKlinefeed;
                        m &= ~XEMACS_MOD_CONTROL;
                        break;
                case 'M':
                        k = QKreturn;
                        m &= ~XEMACS_MOD_CONTROL;
                        break;
                case '[':
                        k = QKescape;
                        m &= ~XEMACS_MOD_CONTROL;
                        break;
                default:
#if defined(HAVE_TTY)
                        if (do_backspace_mapping &&
                            CHARP(con->tty_erase_char) &&
                            c - '@' == XCHAR(con->tty_erase_char)) {
                                k = QKbackspace;
                                m &= ~XEMACS_MOD_CONTROL;
                        }
#endif                          /* defined(HAVE_TTY)  */
                        break;
                }
                if (c >= 'A' && c <= 'Z')
                        c -= 'A' - 'a';
        }
#if defined(HAVE_TTY)
        else if (do_backspace_mapping &&
                 CHARP(con->tty_erase_char) && c == XCHAR(con->tty_erase_char))
                k = QKbackspace;
#endif                          /* defined(HAVE_TTY)  */
        else if (c == 127)
                k = QKdelete;
        else if (c == ' ')
                k = QKspace;

        event->event_type = key_press_event;
        event->timestamp = 0;   /* #### */
        event->channel = make_console(con);
        event->event.key.keysym = (!NILP(k) ? k : make_char(c));
        event->event.key.modifiers = m;
}

/* This variable controls what character name -> character code mapping
   we are using.  Window-system-specific code sets this to some symbol,
   and we use that symbol as the plist key to convert keysyms into 8-bit
   codes.  In this way one can have several character sets predefined and
   switch them by changing this.

   #### This is utterly bogus and should be removed.
 */
Lisp_Object Vcharacter_set_property;

Emchar
event_to_character(Lisp_Event * event,
                   int allow_extra_modifiers,
                   int allow_meta, int allow_non_ascii)
{
        Emchar c = 0;
        Lisp_Object code;

        if (event->event_type != key_press_event) {
                assert(event->event_type != dead_event);
                return -1;
        }
        if (!allow_extra_modifiers &&
            event->event.key.
            modifiers & (XEMACS_MOD_SUPER | XEMACS_MOD_HYPER | XEMACS_MOD_ALT))
                return -1;
        if (CHAR_OR_CHAR_INTP(event->event.key.keysym))
                c = XCHAR_OR_CHAR_INT(event->event.key.keysym);
        else if (!SYMBOLP(event->event.key.keysym))
                abort();
        else if (allow_non_ascii && !NILP(Vcharacter_set_property)
                 /* Allow window-system-specific extensibility of
                    keysym->code mapping */
                 && CHAR_OR_CHAR_INTP(code = Fget(event->event.key.keysym,
                                                  Vcharacter_set_property,
                                                  Qnil)))
                c = XCHAR_OR_CHAR_INT(code);
        else if (CHAR_OR_CHAR_INTP(code = Fget(event->event.key.keysym,
                                               Qascii_character, Qnil)))
                c = XCHAR_OR_CHAR_INT(code);
        else
                return -1;

        if (event->event.key.modifiers & XEMACS_MOD_CONTROL) {
                if (c >= 'a' && c <= 'z')
                        c -= ('a' - 'A');
                else
                        /* reject Control-Shift- keys */
                if (c >= 'A' && c <= 'Z' && !allow_extra_modifiers)
                        return -1;

                if (c >= '@' && c <= '_')
                        c -= '@';
                else if (c == ' ')      /* C-space and C-@ are the same. */
                        c = 0;
                else
                        /* reject keys that can't take Control- modifiers */
                if (!allow_extra_modifiers)
                        return -1;
        }

        if (event->event.key.modifiers & XEMACS_MOD_META) {
                if (!allow_meta)
                        return -1;
                if (c & 0200)
                        return -1;      /* don't allow M-oslash (overlap) */
#ifdef MULE
                if (c >= 256)
                        return -1;
#endif
                c |= 0200;
        }
        return c;
}

DEFUN("event-to-character", Fevent_to_character, 1, 4, 0,       /*
Return the closest ASCII approximation to the given event object.
If the event isn't a keypress, this returns nil.
If the ALLOW-EXTRA-MODIFIERS argument is non-nil, then this is lenient in
its translation; it will ignore modifier keys other than control and meta,
and will ignore the shift modifier on those characters which have no
shifted ASCII equivalent (Control-Shift-A for example, will be mapped to
the same ASCII code as Control-A).
If the ALLOW-META argument is non-nil, then the Meta modifier will be
represented by turning on the high bit of the byte returned; otherwise, nil
will be returned for events containing the Meta modifier.
If the ALLOW-NON-ASCII argument is non-nil, then characters which are
present in the prevailing character set (see the `character-set-property'
variable) will be returned as their code in that character set, instead of
the return value being restricted to ASCII.
Note that specifying both ALLOW-META and ALLOW-NON-ASCII is ambiguous, as
both use the high bit; `M-x' and `oslash' will be indistinguishable.
*/
      (event, allow_extra_modifiers, allow_meta, allow_non_ascii))
{
        Emchar c;
        CHECK_LIVE_EVENT(event);
        c = event_to_character(XEVENT(event),
                               !NILP(allow_extra_modifiers),
                               !NILP(allow_meta), !NILP(allow_non_ascii));
        return c < 0 ? Qnil : make_char(c);
}

DEFUN("character-to-event", Fcharacter_to_event, 1, 4, 0,       /*
Convert KEY-DESCRIPTION into an event structure, replete with bucky bits.

KEY-DESCRIPTION is the first argument, and the event to fill in is the
second.  This function contains knowledge about what various kinds of
arguments ``mean'' -- for example, the number 9 is converted to the
character ``Tab'', not the distinct character ``Control-I''.

KEY-DESCRIPTION can be an integer, a character, a symbol such as 'clear,
or a list such as '(control backspace).

If the optional second argument EVENT is an event, it is modified and
returned; otherwise, a new event object is created and returned.

Optional third arg CONSOLE is the console to store in the event, and
defaults to the selected console.

If KEY-DESCRIPTION is an integer or character, the high bit may be
interpreted as the meta key. (This is done for backward compatibility
in lots of places.)  If USE-CONSOLE-META-FLAG is nil, this will always
be the case.  If USE-CONSOLE-META-FLAG is non-nil, the `meta' flag for
CONSOLE affects whether the high bit is interpreted as a meta
key. (See `set-input-mode'.)  If you don't want this silly meta
interpretation done, you should pass in a list containing the
character.

Beware that character-to-event and event-to-character are not strictly
inverse functions, since events contain much more information than the
Lisp character object type can encode.
*/
      (keystroke, event, console, use_console_meta_flag))
{
        struct console *con = decode_console(console);
        if (NILP(event))
                event = Fmake_event(Qnil, Qnil);
        else
                CHECK_LIVE_EVENT(event);
        if (CONSP(keystroke) || SYMBOLP(keystroke))
                key_desc_list_to_event(keystroke, event, 1);
        else {
                CHECK_CHAR_COERCE_INT(keystroke);
                character_to_event(XCHAR(keystroke), XEVENT(event), con,
                                   !NILP(use_console_meta_flag), 1);
        }
        return event;
}

void nth_of_key_sequence_as_event(Lisp_Object seq, int n, Lisp_Object event)
{
        assert(STRINGP(seq) || VECTORP(seq));
        assert(n < XINT(Flength(seq)));

        if (STRINGP(seq)) {
                Emchar ch = string_char(XSTRING(seq), n);
                Fcharacter_to_event(make_char(ch), event, Qnil, Qnil);
        } else {
                Lisp_Object keystroke = XVECTOR_DATA(seq)[n];
                if (EVENTP(keystroke))
                        Fcopy_event(keystroke, event);
                else
                        Fcharacter_to_event(keystroke, event, Qnil, Qnil);
        }
}

Lisp_Object key_sequence_to_event_chain(Lisp_Object seq)
{
        int len = XINT(Flength(seq));
        int i;
        Lisp_Object head = Qnil, tail = Qnil;

        for (i = 0; i < len; i++) {
                Lisp_Object event = Fmake_event(Qnil, Qnil);
                nth_of_key_sequence_as_event(seq, i, event);
                enqueue_event(event, &head, &tail);
        }

        return head;
}

void format_event_object(char *buf, Lisp_Event * event, int brief)
{
        int mouse_p = 0;
        int mod = 0;
        Lisp_Object key;

        switch (event->event_type) {
        case key_press_event: {
                mod = event->event.key.modifiers;
                key = event->event.key.keysym;
                /* Hack. */
                if (!brief && CHARP(key) &&
                    mod & (XEMACS_MOD_CONTROL | XEMACS_MOD_META |
                           XEMACS_MOD_SUPER | XEMACS_MOD_HYPER)) {
                        int k = XCHAR(key);
                        if (k >= 'a' && k <= 'z')
                                key = make_char(k - ('a' - 'A'));
                        else if (k >= 'A' && k <= 'Z')
                                mod |= XEMACS_MOD_SHIFT;
                }
                break;
        }
        case button_release_event:
                mouse_p++;
                /* Fall through */
        case button_press_event: {
                mouse_p++;
                mod = event->event.button.modifiers;
                key = make_char(event->event.button.button + '0');
                break;
        }
        case magic_event: {
                const char *name = NULL;

#ifdef HAVE_X_WINDOWS
                Lisp_Object console = CDFW_CONSOLE(EVENT_CHANNEL(event));
                if (CONSOLE_X_P(XCONSOLE(console))) {
                        name = x_event_name(event->event.magic.
                                            underlying_x_event.
                                            type);
                }
#endif                          /* HAVE_X_WINDOWS */

                if (name) {
                        strcpy(buf, name);
                } else {
                        strcpy(buf, "???");
                }
                return;
        }
        case magic_eval_event:
                strcpy(buf, "magic-eval");
                return;
        case pointer_motion_event:
                strcpy(buf, "motion");
                return;
        case misc_user_event:
                strcpy(buf, "misc-user");
                return;
        case eval_event:
                strcpy(buf, "eval");
                return;
        case process_event:
                strcpy(buf, "process");
                return;
        case timeout_event:
                strcpy(buf, "timeout");
                return;
        case empty_event:
                strcpy(buf, "empty");
                return;
        case dead_event:
                strcpy(buf, "DEAD-EVENT");
                return;
#ifdef EF_USE_ASYNEQ
        case eaten_myself_event:
                strcpy(buf, "suicide");
                return;
        case work_started_event:
                strcpy(buf, "started-work");
                return;
        case work_finished_event:
                strcpy(buf, "finished-work");
                return;
#endif  /* EF_USE_ASYNEQ */

        default:
                abort();
                return;
        }
#define modprint1(x)  do { strcpy (buf, (x)); buf += sizeof (x)-1; } while (0)
#define modprint(x,y) do { if (brief) modprint1 (y); else modprint1 (x); } while (0)
        if (mod & XEMACS_MOD_CONTROL)
                modprint("control-", "C-");
        if (mod & XEMACS_MOD_META)
                modprint("meta-", "M-");
        if (mod & XEMACS_MOD_SUPER)
                modprint("super-", "S-");
        if (mod & XEMACS_MOD_HYPER)
                modprint("hyper-", "H-");
        if (mod & XEMACS_MOD_ALT)
                modprint("alt-", "A-");
        if (mod & XEMACS_MOD_SHIFT)
                modprint("shift-", "Sh-");
        if (mouse_p) {
                modprint1("button");
                --mouse_p;
        }
#undef modprint
#undef modprint1

        if (CHARP(key)) {
                buf += set_charptr_emchar((Bufbyte *) buf, XCHAR(key));
                *buf = 0;
        } else if (SYMBOLP(key)) {
                const char *str = 0;
                if (brief) {
                        if (EQ(key, QKlinefeed))
                                str = "LFD";
                        else if (EQ(key, QKtab))
                                str = "TAB";
                        else if (EQ(key, QKreturn))
                                str = "RET";
                        else if (EQ(key, QKescape))
                                str = "ESC";
                        else if (EQ(key, QKdelete))
                                str = "DEL";
                        else if (EQ(key, QKspace))
                                str = "SPC";
                        else if (EQ(key, QKbackspace))
                                str = "BS";
                }
                if (str) {
                        int i = strlen(str);
                        memcpy(buf, str, i + 1);
                        str += i;
                } else {
                        Lisp_String *name = XSYMBOL(key)->name;
                        memcpy(buf, string_data(name), string_length(name) + 1);
                        str += string_length(name);
                }
        } else
                abort();
        if (mouse_p)
                strncpy(buf, "up", 4);
}

DEFUN("eventp", Feventp, 1, 1, 0,       /*
True if OBJECT is an event object.
*/
      (object))
{
        return EVENTP(object) ? Qt : Qnil;
}

DEFUN("event-live-p", Fevent_live_p, 1, 1, 0,   /*
True if OBJECT is an event object that has not been deallocated.
*/
      (object))
{
        return EVENTP(object) && XEVENT(object)->event_type != dead_event ?
            Qt : Qnil;
}

#if 0                           /* debugging functions */

xxDEFUN("event-next", Fevent_next, 1, 1, 0,     /*
Return the event object's `next' event, or nil if it has none.
The `next-event' field is changed by calling `set-next-event'.
                                                 */
        (event))
{
        Lisp_Event *e;
        CHECK_LIVE_EVENT(event);

        return XEVENT_NEXT(event);
}

xxDEFUN("set-event-next", Fset_event_next, 2, 2, 0,     /*
Set the `next event' of EVENT to NEXT-EVENT.
NEXT-EVENT must be an event object or nil.
                                                         */
        (event, next_event))
{
        Lisp_Object ev;

        CHECK_LIVE_EVENT(event);
        if (NILP(next_event)) {
                XSET_EVENT_NEXT(event, Qnil);
                return Qnil;
        }

        CHECK_LIVE_EVENT(next_event);

        EVENT_CHAIN_LOOP(ev, XEVENT_NEXT(event)) {
                QUIT;
                if (EQ(ev, event))
                        signal_error(Qerror,
                                     list3(build_string("Cyclic event-next"),
                                           event, next_event));
        }
        XSET_EVENT_NEXT(event, next_event);
        return next_event;
}

#endif                          /* 0 */

DEFUN("event-type", Fevent_type, 1, 1, 0,       /*
Return the type of EVENT.
This will be a symbol; one of

key-press A key was pressed.
button-press      A mouse button was pressed.
button-release    A mouse button was released.
misc-user Some other user action happened; typically, this is
a menu selection or scrollbar action.
motion            The mouse moved.
process           Input is available from a subprocess.
timeout           A timeout has expired.
eval              This causes a specified action to occur when dispatched.
magic             Some window-system-specific event has occurred.
empty             The event has been allocated but not assigned.

*/
      (event))
{
        CHECK_LIVE_EVENT(event);
        switch (XEVENT(event)->event_type) {
        case key_press_event:
                return Qkey_press;
        case button_press_event:
                return Qbutton_press;
        case button_release_event:
                return Qbutton_release;
        case misc_user_event:
                return Qmisc_user;
        case pointer_motion_event:
                return Qmotion;
        case process_event:
                return Qprocess;
        case timeout_event:
                return Qtimeout;
        case eval_event:
                return Qeval;
        case magic_event:
        case magic_eval_event:
                return Qmagic;

#ifdef EF_USE_ASYNEQ
        case eaten_myself_event:
                return Qworker_suicide;
        case work_started_event:
                return Qworker_started_work;
        case work_finished_event:
                return Qworker_finished_work;
#endif  /* EF_USE_ASYNEQ */

        case empty_event:
                return Qempty;

        case dead_event:
        default:
                abort();
                return Qnil;
        }
}

DEFUN("event-timestamp", Fevent_timestamp, 1, 1, 0,     /*
Return the timestamp of the event object EVENT.
Timestamps are measured in milliseconds since the start of the window system.
They are NOT related to any current time measurement.
They should be compared with `event-timestamp<'.
See also `current-event-timestamp'.
*/
      (event))
{
        CHECK_LIVE_EVENT(event);
        /* This junk is so that timestamps don't get to be negative, but contain
           as many bits as this particular emacs will allow.
         */
        return make_int(EMACS_INT_MAX & XEVENT(event)->timestamp);
}

#define TIMESTAMP_HALFSPACE (1L << (INT_VALBITS - 2))

DEFUN("event-timestamp<", Fevent_timestamp_lessp, 2, 2, 0,      /*
Return true if timestamp TIME1 is earlier than timestamp TIME2.
This correctly handles timestamp wrap.
See also `event-timestamp' and `current-event-timestamp'.
*/
      (time1, time2))
{
        EMACS_INT t1, t2;

        CHECK_NATNUM(time1);
        CHECK_NATNUM(time2);
        t1 = XINT(time1);
        t2 = XINT(time2);

        if (t1 < t2)
                return t2 - t1 < TIMESTAMP_HALFSPACE ? Qt : Qnil;
        else
                return t1 - t2 < TIMESTAMP_HALFSPACE ? Qnil : Qt;
}

#define CHECK_EVENT_TYPE(e,t1,sym) do {         \
  CHECK_LIVE_EVENT (e);                         \
  if (XEVENT(e)->event_type != (t1))            \
    e = wrong_type_argument (sym,e);            \
} while (0)

#define CHECK_EVENT_TYPE2(e,t1,t2,sym) do {             \
  CHECK_LIVE_EVENT (e);                                 \
  {                                                     \
    emacs_event_type CET_type = XEVENT (e)->event_type; \
    if (CET_type != (t1) &&                             \
        CET_type != (t2))                               \
      e = wrong_type_argument (sym,e);                  \
  }                                                     \
} while (0)

#define CHECK_EVENT_TYPE3(e,t1,t2,t3,sym) do {          \
  CHECK_LIVE_EVENT (e);                                 \
  {                                                     \
    emacs_event_type CET_type = XEVENT (e)->event_type; \
    if (CET_type != (t1) &&                             \
        CET_type != (t2) &&                             \
        CET_type != (t3))                               \
      e = wrong_type_argument (sym,e);                  \
  }                                                     \
} while (0)

DEFUN("event-key", Fevent_key, 1, 1, 0, /*
Return the Keysym of the key-press event EVENT.
This will be a character if the event is associated with one, else a symbol.
*/
      (event))
{
        CHECK_EVENT_TYPE(event, key_press_event, Qkey_press_event_p);
        return XEVENT(event)->event.key.keysym;
}

DEFUN("event-button", Fevent_button, 1, 1, 0,   /*
Return the button-number of the button-press or button-release event EVENT.
*/
      (event))
{

        CHECK_EVENT_TYPE3(event, button_press_event, button_release_event,
                          misc_user_event, Qbutton_event_p);
#ifdef HAVE_WINDOW_SYSTEM
        if (XEVENT(event)->event_type == misc_user_event)
                return make_int(XEVENT(event)->event.misc.button);
        else
                return make_int(XEVENT(event)->event.button.button);
#else                           /* !HAVE_WINDOW_SYSTEM */
        return Qzero;
#endif                          /* !HAVE_WINDOW_SYSTEM */

}

DEFUN("event-modifier-bits", Fevent_modifier_bits, 1, 1, 0,     /*
Return a number representing the modifier keys and buttons which were down
when the given mouse or keyboard event was produced.
See also the function `event-modifiers'.
*/
      (event))
{
      again:
        CHECK_LIVE_EVENT(event);
        switch (XEVENT(event)->event_type) {
        case key_press_event:
                return make_int(XEVENT(event)->event.key.modifiers);
        case button_press_event:
        case button_release_event:
                return make_int(XEVENT(event)->event.button.modifiers);
        case pointer_motion_event:
                return make_int(XEVENT(event)->event.motion.modifiers);
        case misc_user_event:
                return make_int(XEVENT(event)->event.misc.modifiers);

        case empty_event:
        case process_event:
        case timeout_event:
        case magic_event:
        case magic_eval_event:
        case eval_event:
#ifdef EF_USE_ASYNEQ
        case eaten_myself_event:
        case work_started_event:
        case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
        case dead_event:
        default:
                event = wrong_type_argument(
                        intern("key-or-mouse-event-p"), event);
                goto again;
        }
}

DEFUN("event-modifiers", Fevent_modifiers, 1, 1, 0,     /*
Return a list of symbols, the names of the modifier keys and buttons
which were down when the given mouse or keyboard event was produced.
See also the function `event-modifier-bits'.

The possible symbols in the list are

`shift':     The Shift key.  Will not appear, in general, on key events
where the keysym is an ASCII character, because using Shift
on such a character converts it into another character rather
than actually just adding a Shift modifier.

`control':   The Control key.

`meta':      The Meta key.  On PC's and PC-style keyboards, this is generally
labelled \"Alt\"; Meta is a holdover from early Lisp Machines and
such, propagated through the X Window System.  On Sun keyboards,
this key is labelled with a diamond.

`alt':       The \"Alt\" key.  Alt is in quotes because this does not refer
to what it obviously should refer to, namely the Alt key on PC
keyboards.  Instead, it refers to the key labelled Alt on Sun
keyboards, and to no key at all on PC keyboards.

`super':     The Super key.  Most keyboards don't have any such key, but
under X Windows using `xmodmap' you can assign any key (such as
an underused right-shift, right-control, or right-alt key) to
this key modifier.

`hyper':     The Hyper key.  Works just like the Super key.

`button1':   The mouse buttons.  This means that the specified button was held
`button2':   down at the time the event occurred.  NOTE: For button-press
`button3':   events, the button that was just pressed down does NOT appear in
`button4':   the modifiers.
`button5':

Button modifiers are currently ignored when defining and looking up key and
mouse strokes in keymaps.  This could be changed, which would allow a user to
create button-chord actions, use a button as a key modifier and do other
clever things.
*/
      (event))
{
        int mod = XINT(Fevent_modifier_bits(event));
        Lisp_Object result = Qnil;
        struct gcpro gcpro1;

        GCPRO1(result);
        if (mod & XEMACS_MOD_SHIFT)
                result = Fcons(Qshift, result);
        if (mod & XEMACS_MOD_ALT)
                result = Fcons(Qalt, result);
        if (mod & XEMACS_MOD_HYPER)
                result = Fcons(Qhyper, result);
        if (mod & XEMACS_MOD_SUPER)
                result = Fcons(Qsuper, result);
        if (mod & XEMACS_MOD_META)
                result = Fcons(Qmeta, result);
        if (mod & XEMACS_MOD_CONTROL)
                result = Fcons(Qcontrol, result);
        if (mod & XEMACS_MOD_BUTTON1)
                result = Fcons(Qbutton1, result);
        if (mod & XEMACS_MOD_BUTTON2)
                result = Fcons(Qbutton2, result);
        if (mod & XEMACS_MOD_BUTTON3)
                result = Fcons(Qbutton3, result);
        if (mod & XEMACS_MOD_BUTTON4)
                result = Fcons(Qbutton4, result);
        if (mod & XEMACS_MOD_BUTTON5)
                result = Fcons(Qbutton5, result);
        RETURN_UNGCPRO(Fnreverse(result));
}

static int
event_x_y_pixel_internal(Lisp_Object event, int *x, int *y, int relative)
{
        struct window *w;
        struct frame *f;

        if (XEVENT(event)->event_type == pointer_motion_event) {
                *x = XEVENT(event)->event.motion.x;
                *y = XEVENT(event)->event.motion.y;
        } else if (XEVENT(event)->event_type == button_press_event ||
                   XEVENT(event)->event_type == button_release_event) {
                *x = XEVENT(event)->event.button.x;
                *y = XEVENT(event)->event.button.y;
        } else if (XEVENT(event)->event_type == misc_user_event) {
                *x = XEVENT(event)->event.misc.x;
                *y = XEVENT(event)->event.misc.y;
        } else
                return 0;

        f = XFRAME(EVENT_CHANNEL(XEVENT(event)));

        if (relative) {
                w = find_window_by_pixel_pos(*x, *y, f->root_window);

                if (!w)
                        return 1;       /* #### What should really happen here? */

                *x -= w->pixel_left;
                *y -= w->pixel_top;
        } else {
                *y -= FRAME_REAL_TOP_TOOLBAR_HEIGHT(f) -
                    FRAME_REAL_TOP_TOOLBAR_BORDER_WIDTH(f);
                *x -= FRAME_REAL_LEFT_TOOLBAR_WIDTH(f) -
                    FRAME_REAL_LEFT_TOOLBAR_BORDER_WIDTH(f);
        }

        return 1;
}

DEFUN("event-window-x-pixel", Fevent_window_x_pixel, 1, 1, 0,   /*
Return the X position in pixels of mouse event EVENT.
The value returned is relative to the window the event occurred in.
This will signal an error if the event is not a mouse event.
See also `mouse-event-p' and `event-x-pixel'.
*/
      (event))
{
        int x, y;

        CHECK_LIVE_EVENT(event);

        if (!event_x_y_pixel_internal(event, &x, &y, 1))
                return wrong_type_argument(Qmouse_event_p, event);
        else
                return make_int(x);
}

DEFUN("event-window-y-pixel", Fevent_window_y_pixel, 1, 1, 0,   /*
Return the Y position in pixels of mouse event EVENT.
The value returned is relative to the window the event occurred in.
This will signal an error if the event is not a mouse event.
See also `mouse-event-p' and `event-y-pixel'.
*/
      (event))
{
        int x, y;

        CHECK_LIVE_EVENT(event);

        if (!event_x_y_pixel_internal(event, &x, &y, 1))
                return wrong_type_argument(Qmouse_event_p, event);
        else
                return make_int(y);
}

DEFUN("event-x-pixel", Fevent_x_pixel, 1, 1, 0, /*
Return the X position in pixels of mouse event EVENT.
The value returned is relative to the frame the event occurred in.
This will signal an error if the event is not a mouse event.
See also `mouse-event-p' and `event-window-x-pixel'.
*/
      (event))
{
        int x, y;

        CHECK_LIVE_EVENT(event);

        if (!event_x_y_pixel_internal(event, &x, &y, 0))
                return wrong_type_argument(Qmouse_event_p, event);
        else
                return make_int(x);
}

DEFUN("event-y-pixel", Fevent_y_pixel, 1, 1, 0, /*
Return the Y position in pixels of mouse event EVENT.
The value returned is relative to the frame the event occurred in.
This will signal an error if the event is not a mouse event.
See also `mouse-event-p' `event-window-y-pixel'.
*/
      (event))
{
        int x, y;

        CHECK_LIVE_EVENT(event);

        if (!event_x_y_pixel_internal(event, &x, &y, 0))
                return wrong_type_argument(Qmouse_event_p, event);
        else
                return make_int(y);
}

/* Given an event, return a value:

     OVER_TOOLBAR:      over one of the 4 frame toolbars
     OVER_MODELINE:     over a modeline
     OVER_BORDER:       over an internal border
     OVER_NOTHING:      over the text area, but not over text
     OVER_OUTSIDE:      outside of the frame border
     OVER_TEXT:         over text in the text area
     OVER_V_DIVIDER:    over windows vertical divider

   and return:

   The X char position in CHAR_X, if not a null pointer.
   The Y char position in CHAR_Y, if not a null pointer.
   (These last two values are relative to the window the event is over.)
   The window it's over in W, if not a null pointer.
   The buffer position it's over in BUFP, if not a null pointer.
   The closest buffer position in CLOSEST, if not a null pointer.

   OBJ_X, OBJ_Y, OBJ1, and OBJ2 are as in pixel_to_glyph_translation().
*/

static int
event_pixel_translation(Lisp_Object event, int *char_x, int *char_y,
                        int *obj_x, int *obj_y,
                        struct window **w, Bufpos * bufp, Bufpos * closest,
                        Charcount * modeline_closest,
                        Lisp_Object * obj1, Lisp_Object * obj2)
{
        int pix_x = 0;
        int pix_y = 0;
        int result;
        Lisp_Object frame;

        int ret_x, ret_y, ret_obj_x, ret_obj_y;
        struct window *ret_w;
        Bufpos ret_bufp, ret_closest;
        Charcount ret_modeline_closest;
        Lisp_Object ret_obj1, ret_obj2;

        CHECK_LIVE_EVENT(event);
        frame = XEVENT(event)->channel;
        switch (XEVENT(event)->event_type) {
        case pointer_motion_event:
                pix_x = XEVENT(event)->event.motion.x;
                pix_y = XEVENT(event)->event.motion.y;
                break;
        case button_press_event:
        case button_release_event:
                pix_x = XEVENT(event)->event.button.x;
                pix_y = XEVENT(event)->event.button.y;
                break;
        case misc_user_event:
                pix_x = XEVENT(event)->event.misc.x;
                pix_y = XEVENT(event)->event.misc.y;
                break;

        case empty_event:
        case key_press_event:
        case process_event:
        case timeout_event:
        case magic_event:
        case magic_eval_event:
        case eval_event:
#ifdef EF_USE_ASYNEQ
        case eaten_myself_event:
        case work_started_event:
        case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
        case dead_event:
        default:
                dead_wrong_type_argument(Qmouse_event_p, event);
        }

        result = pixel_to_glyph_translation(XFRAME(frame), pix_x, pix_y,
                                            &ret_x, &ret_y, &ret_obj_x,
                                            &ret_obj_y, &ret_w, &ret_bufp,
                                            &ret_closest, &ret_modeline_closest,
                                            &ret_obj1, &ret_obj2);

        if (result == OVER_NOTHING || result == OVER_OUTSIDE)
                ret_bufp = 0;
        else if (ret_w && NILP(ret_w->buffer))
                /* Why does this happen?  (Does it still happen?)
                   I guess the window has gotten reused as a non-leaf... */
                ret_w = 0;

        /* #### pixel_to_glyph_translation() sometimes returns garbage...
           The word has type Lisp_Type_Record (presumably meaning `extent') but the
           pointer points to random memory, often filled with 0, sometimes not.
         */
        /* #### Chuck, do we still need this crap? */
        if (!NILP(ret_obj1) && !(GLYPHP(ret_obj1)
#ifdef HAVE_TOOLBARS
                                 || TOOLBAR_BUTTONP(ret_obj1)
#endif
            ))
                abort();
        if (!NILP(ret_obj2) && !(EXTENTP(ret_obj2) || CONSP(ret_obj2)))
                abort();

        if (char_x)
                *char_x = ret_x;
        if (char_y)
                *char_y = ret_y;
        if (obj_x)
                *obj_x = ret_obj_x;
        if (obj_y)
                *obj_y = ret_obj_y;
        if (w)
                *w = ret_w;
        if (bufp)
                *bufp = ret_bufp;
        if (closest)
                *closest = ret_closest;
        if (modeline_closest)
                *modeline_closest = ret_modeline_closest;
        if (obj1)
                *obj1 = ret_obj1;
        if (obj2)
                *obj2 = ret_obj2;

        return result;
}

DEFUN("event-over-text-area-p", Fevent_over_text_area_p, 1, 1, 0,       /*
Return t if the mouse event EVENT occurred over the text area of a window.
The modeline is not considered to be part of the text area.
*/
      (event))
{
        int result =
            event_pixel_translation(event, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);

        return result == OVER_TEXT || result == OVER_NOTHING ? Qt : Qnil;
}

DEFUN("event-over-modeline-p", Fevent_over_modeline_p, 1, 1, 0, /*
Return t if the mouse event EVENT occurred over the modeline of a window.
*/
      (event))
{
        int result =
            event_pixel_translation(event, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);

        return result == OVER_MODELINE ? Qt : Qnil;
}

DEFUN("event-over-border-p", Fevent_over_border_p, 1, 1, 0,     /*
Return t if the mouse event EVENT occurred over an internal border.
*/
      (event))
{
        int result =
            event_pixel_translation(event, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);

        return result == OVER_BORDER ? Qt : Qnil;
}

DEFUN("event-over-toolbar-p", Fevent_over_toolbar_p, 1, 1, 0,   /*
Return t if the mouse event EVENT occurred over a toolbar.
*/
      (event))
{
        int result =
            event_pixel_translation(event, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);

        return result == OVER_TOOLBAR ? Qt : Qnil;
}

DEFUN("event-over-vertical-divider-p", Fevent_over_vertical_divider_p, 1, 1, 0, /*
Return t if the mouse event EVENT occurred over a window divider.
*/
      (event))
{
        int result =
            event_pixel_translation(event, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);

        return result == OVER_V_DIVIDER ? Qt : Qnil;
}

struct console *event_console_or_selected(Lisp_Object event)
{
        Lisp_Object channel = EVENT_CHANNEL(XEVENT(event));
        Lisp_Object console = CDFW_CONSOLE(channel);

        if (NILP(console))
                console = Vselected_console;

        return XCONSOLE(console);
}

DEFUN("event-channel", Fevent_channel, 1, 1, 0, /*
Return the channel that the event EVENT occurred on.
This will be a frame, device, console, or nil for some types
of events (e.g. eval events).
*/
      (event))
{
        CHECK_LIVE_EVENT(event);
        return EVENT_CHANNEL(XEVENT(event));
}

DEFUN("event-window", Fevent_window, 1, 1, 0,   /*
Return the window over which mouse event EVENT occurred.
This may be nil if the event occurred in the border or over a toolbar.
The modeline is considered to be within the window it describes.
*/
      (event))
{
        struct window *w;

        event_pixel_translation(event, 0, 0, 0, 0, &w, 0, 0, 0, 0, 0);

        if (!w)
                return Qnil;
        else {
                Lisp_Object window;

                XSETWINDOW(window, w);
                return window;
        }
}

DEFUN("event-point", Fevent_point, 1, 1, 0,     /*
Return the character position of the mouse event EVENT.
If the event did not occur over a window, or did not occur over text,
then this returns nil.  Otherwise, it returns a position in the buffer
visible in the event's window.
*/
      (event))
{
        Bufpos bufp;
        struct window *w;

        event_pixel_translation(event, 0, 0, 0, 0, &w, &bufp, 0, 0, 0, 0);

        return w && bufp ? make_int(bufp) : Qnil;
}

DEFUN("event-closest-point", Fevent_closest_point, 1, 1, 0,     /*
Return the character position closest to the mouse event EVENT.
If the event did not occur over a window or over text, return the
closest point to the location of the event.  If the Y pixel position
overlaps a window and the X pixel position is to the left of that
window, the closest point is the beginning of the line containing the
Y position.  If the Y pixel position overlaps a window and the X pixel
position is to the right of that window, the closest point is the end
of the line containing the Y position.  If the Y pixel position is
above a window, return 0.  If it is below the last character in a window,
return the value of (window-end).
*/
      (event))
{
        Bufpos bufp;

        event_pixel_translation(event, 0, 0, 0, 0, 0, 0, &bufp, 0, 0, 0);

        return bufp ? make_int(bufp) : Qnil;
}

DEFUN("event-x", Fevent_x, 1, 1, 0,     /*
Return the X position of the mouse event EVENT in characters.
This is relative to the window the event occurred over.
*/
      (event))
{
        int char_x;

        event_pixel_translation(event, &char_x, 0, 0, 0, 0, 0, 0, 0, 0, 0);

        return make_int(char_x);
}

DEFUN("event-y", Fevent_y, 1, 1, 0,     /*
Return the Y position of the mouse event EVENT in characters.
This is relative to the window the event occurred over.
*/
      (event))
{
        int char_y;

        event_pixel_translation(event, 0, &char_y, 0, 0, 0, 0, 0, 0, 0, 0);

        return make_int(char_y);
}

DEFUN("event-modeline-position", Fevent_modeline_position, 1, 1, 0,     /*
Return the character position in the modeline that EVENT occurred over.
EVENT should be a mouse event.  If EVENT did not occur over a modeline,
nil is returned.  You can determine the actual character that the
event occurred over by looking in `generated-modeline-string' at the
returned character position.  Note that `generated-modeline-string'
is buffer-local, and you must use EVENT's buffer when retrieving
`generated-modeline-string' in order to get accurate results.
*/
      (event))
{
        Charcount mbufp;
        int where;

        where =
            event_pixel_translation(event, 0, 0, 0, 0, 0, 0, 0, &mbufp, 0, 0);

        return (mbufp < 0 || where != OVER_MODELINE) ? Qnil : make_int(mbufp);
}

DEFUN("event-glyph", Fevent_glyph, 1, 1, 0,     /*
Return the glyph that the mouse event EVENT occurred over, or nil.
*/
      (event))
{
        Lisp_Object glyph;
        struct window *w;

        event_pixel_translation(event, 0, 0, 0, 0, &w, 0, 0, 0, &glyph, 0);

        return w && GLYPHP(glyph) ? glyph : Qnil;
}

DEFUN("event-glyph-extent", Fevent_glyph_extent, 1, 1, 0,       /*
Return the extent of the glyph that the mouse event EVENT occurred over.
If the event did not occur over a glyph, nil is returned.
*/
      (event))
{
        Lisp_Object extent;
        struct window *w;

        event_pixel_translation(event, 0, 0, 0, 0, &w, 0, 0, 0, 0, &extent);

        return w && EXTENTP(extent) ? extent : Qnil;
}

DEFUN("event-glyph-x-pixel", Fevent_glyph_x_pixel, 1, 1, 0,     /*
Return the X pixel position of EVENT relative to the glyph it occurred over.
EVENT should be a mouse event.  If the event did not occur over a glyph,
nil is returned.
*/
      (event))
{
        Lisp_Object extent;
        struct window *w;
        int obj_x;

        event_pixel_translation(event, 0, 0, &obj_x, 0, &w, 0, 0, 0, 0,
                                &extent);

        return w && EXTENTP(extent) ? make_int(obj_x) : Qnil;
}

DEFUN("event-glyph-y-pixel", Fevent_glyph_y_pixel, 1, 1, 0,     /*
Return the Y pixel position of EVENT relative to the glyph it occurred over.
EVENT should be a mouse event.  If the event did not occur over a glyph,
nil is returned.
*/
      (event))
{
        Lisp_Object extent;
        struct window *w;
        int obj_y;

        event_pixel_translation(event, 0, 0, 0, &obj_y, &w, 0, 0, 0, 0,
                                &extent);

        return w && EXTENTP(extent) ? make_int(obj_y) : Qnil;
}

DEFUN("event-toolbar-button", Fevent_toolbar_button, 1, 1, 0,   /*
Return the toolbar button that the mouse event EVENT occurred over.
If the event did not occur over a toolbar button, nil is returned.
*/
      (event))
{
#ifdef HAVE_TOOLBARS
        Lisp_Object button;

        int result =
            event_pixel_translation(event, 0, 0, 0, 0, 0, 0, 0, 0, &button, 0);

        return result == OVER_TOOLBAR
            && TOOLBAR_BUTTONP(button) ? button : Qnil;
#else
        return Qnil;
#endif
}

DEFUN("event-process", Fevent_process, 1, 1, 0, /*
Return the process of the process-output event EVENT.
*/
      (event))
{
        CHECK_EVENT_TYPE(event, process_event, Qprocess_event_p);
        return XEVENT(event)->event.process.process;
}

DEFUN("event-function", Fevent_function, 1, 1, 0,       /*
Return the callback function of EVENT.
EVENT should be a timeout, misc-user, or eval event.
*/
      (event))
{
      again:
        CHECK_LIVE_EVENT(event);
        switch (XEVENT(event)->event_type) {
        case timeout_event:
                return XEVENT(event)->event.timeout.function;
        case misc_user_event:
                return XEVENT(event)->event.misc.function;
        case eval_event:
                return XEVENT(event)->event.eval.function;

        case empty_event:
        case key_press_event:
        case button_press_event:
        case button_release_event:
        case pointer_motion_event:
        case process_event:
        case magic_event:
        case magic_eval_event:
#ifdef EF_USE_ASYNEQ
        case eaten_myself_event:
        case work_started_event:
        case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
        case dead_event:
        default:
                event =
                    wrong_type_argument(intern("timeout-or-eval-event-p"),
                                        event);
                goto again;
        }
}

DEFUN("event-object", Fevent_object, 1, 1, 0,   /*
Return the callback function argument of EVENT.
EVENT should be a timeout, misc-user, or eval event.
*/
      (event))
{
again:
        CHECK_LIVE_EVENT(event);
        switch (XEVENT(event)->event_type) {
        case timeout_event:
                return XEVENT(event)->event.timeout.object;
        case misc_user_event:
                return XEVENT(event)->event.misc.object;
        case eval_event:
                return XEVENT(event)->event.eval.object;

        case empty_event:
        case key_press_event:
        case button_press_event:
        case button_release_event:
        case pointer_motion_event:
        case process_event:
        case magic_event:
        case magic_eval_event:
#ifdef EF_USE_ASYNEQ
        case eaten_myself_event:
        case work_started_event:
        case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
        case dead_event:
        default:
                event = wrong_type_argument(
                        intern("timeout-or-eval-event-p"), event);
                goto again;
        }
}

DEFUN("event-properties", Fevent_properties, 1, 1, 0,   /*
Return a list of all of the properties of EVENT.
This is in the form of a property list (alternating keyword/value pairs).
*/
      (event))
{
        Lisp_Object props = Qnil;
        Lisp_Event *e;
        struct gcpro gcpro1;

        CHECK_LIVE_EVENT(event);
        e = XEVENT(event);
        GCPRO1(props);

        props = cons3(Qtimestamp, Fevent_timestamp(event), props);

        switch (e->event_type) {
        default:
                abort();

        case process_event:
                props = cons3(Qprocess, e->event.process.process, props);
                break;

        case timeout_event:
                props = cons3(Qobject, Fevent_object(event), props);
                props = cons3(Qfunction, Fevent_function(event), props);
                props = cons3(Qid, make_int(e->event.timeout.id_number), props);
                break;

        case key_press_event:
                props = cons3(Qmodifiers, Fevent_modifiers(event), props);
                props = cons3(Qkey, Fevent_key(event), props);
                break;

        case button_press_event:
        case button_release_event:
                props = cons3(Qy, Fevent_y_pixel(event), props);
                props = cons3(Qx, Fevent_x_pixel(event), props);
                props = cons3(Qmodifiers, Fevent_modifiers(event), props);
                props = cons3(Qbutton, Fevent_button(event), props);
                break;

        case pointer_motion_event:
                props = cons3(Qmodifiers, Fevent_modifiers(event), props);
                props = cons3(Qy, Fevent_y_pixel(event), props);
                props = cons3(Qx, Fevent_x_pixel(event), props);
                break;

        case misc_user_event:
                props = cons3(Qobject, Fevent_object(event), props);
                props = cons3(Qfunction, Fevent_function(event), props);
                props = cons3(Qy, Fevent_y_pixel(event), props);
                props = cons3(Qx, Fevent_x_pixel(event), props);
                props = cons3(Qmodifiers, Fevent_modifiers(event), props);
                props = cons3(Qbutton, Fevent_button(event), props);
                break;

        case eval_event:
                props = cons3(Qobject, Fevent_object(event), props);
                props = cons3(Qfunction, Fevent_function(event), props);
                break;

#ifdef EF_USE_ASYNEQ
                /* are these right here? */
        case eaten_myself_event:
        case work_started_event:
        case work_finished_event:
#endif  /* EF_USE_ASYNEQ */
        case dead_event:

        case magic_eval_event:
        case magic_event:
                break;

        case empty_event:
                RETURN_UNGCPRO(Qnil);
                break;
        }

        props = cons3(Qchannel, Fevent_channel(event), props);
        UNGCPRO;

        return props;
}
\f
/************************************************************************/
/*                            initialization                            */
/************************************************************************/

void syms_of_events(void)
{
        INIT_LRECORD_IMPLEMENTATION(event);

        DEFSUBR(Fcharacter_to_event);
        DEFSUBR(Fevent_to_character);

        DEFSUBR(Fmake_event);
        DEFSUBR(Fdeallocate_event);
        DEFSUBR(Fcopy_event);
        DEFSUBR(Feventp);
        DEFSUBR(Fevent_live_p);
        DEFSUBR(Fevent_type);
        DEFSUBR(Fevent_properties);

        DEFSUBR(Fevent_timestamp);
        DEFSUBR(Fevent_timestamp_lessp);
        DEFSUBR(Fevent_key);
        DEFSUBR(Fevent_button);
        DEFSUBR(Fevent_modifier_bits);
        DEFSUBR(Fevent_modifiers);
        DEFSUBR(Fevent_x_pixel);
        DEFSUBR(Fevent_y_pixel);
        DEFSUBR(Fevent_window_x_pixel);
        DEFSUBR(Fevent_window_y_pixel);
        DEFSUBR(Fevent_over_text_area_p);
        DEFSUBR(Fevent_over_modeline_p);
        DEFSUBR(Fevent_over_border_p);
        DEFSUBR(Fevent_over_toolbar_p);
        DEFSUBR(Fevent_over_vertical_divider_p);
        DEFSUBR(Fevent_channel);
        DEFSUBR(Fevent_window);
        DEFSUBR(Fevent_point);
        DEFSUBR(Fevent_closest_point);
        DEFSUBR(Fevent_x);
        DEFSUBR(Fevent_y);
        DEFSUBR(Fevent_modeline_position);
        DEFSUBR(Fevent_glyph);
        DEFSUBR(Fevent_glyph_extent);
        DEFSUBR(Fevent_glyph_x_pixel);
        DEFSUBR(Fevent_glyph_y_pixel);
        DEFSUBR(Fevent_toolbar_button);
        DEFSUBR(Fevent_process);
        DEFSUBR(Fevent_function);
        DEFSUBR(Fevent_object);

        defsymbol(&Qeventp, "eventp");
        defsymbol(&Qevent_live_p, "event-live-p");
        defsymbol(&Qkey_press_event_p, "key-press-event-p");
        defsymbol(&Qbutton_event_p, "button-event-p");
        defsymbol(&Qmouse_event_p, "mouse-event-p");
        defsymbol(&Qprocess_event_p, "process-event-p");
        defsymbol(&Qkey_press, "key-press");
        defsymbol(&Qbutton_press, "button-press");
        defsymbol(&Qbutton_release, "button-release");
        defsymbol(&Qmisc_user, "misc-user");
        defsymbol(&Qascii_character, "ascii-character");

        defsymbol(&QKbackspace, "backspace");
        defsymbol(&QKtab, "tab");
        defsymbol(&QKlinefeed, "linefeed");
        defsymbol(&QKreturn, "return");
        defsymbol(&QKescape, "escape");
        defsymbol(&QKspace, "space");
        defsymbol(&QKdelete, "delete");
}

void reinit_vars_of_events(void)
{
        init_Vevent_resource();
}

void vars_of_events(void)
{
        reinit_vars_of_events();

        DEFVAR_LISP("character-set-property", &Vcharacter_set_property  /*
A symbol used to look up the 8-bit character of a keysym.
To convert a keysym symbol to an 8-bit code, as when that key is
bound to self-insert-command, we will look up the property that this
variable names on the property list of the keysym-symbol.  The window-
system-specific code will set up appropriate properties and set this
variable.
                                                                         */ );
        Vcharacter_set_property = Qnil;
}