xemacs-beta: src/event-stream.c comparison

comparison src/event-stream.c @ 0:376386a54a3c r19-14

Import from CVS: tag r19-14

author	cvs
date	Mon, 13 Aug 2007 08:45:50 +0200
parents
children	ac2d302a0011

comparison

equal deleted inserted replaced

--1:000000000000
+:376386a54a3c
+/* The portable interface to event streams.
+Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+Copyright (C) 1995 Board of Trustees, University of Illinois.
+Copyright (C) 1995 Sun Microsystems, Inc.
+Copyright (C) 1995, 1996 Ben Wing.
+This file is part of XEmacs.
+XEmacs 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 2, or (at your option) any
+later version.
+XEmacs 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 XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+/* Synched up with: Not in FSF. */
+/* This file has been Mule-ized. */
+/*
+*	DANGER!!
+*
+*	If you ever change ANYTHING in this file, you MUST run the
+*	testcases at the end to make sure that you haven't changed
+*	the semantics of recent-keys, last-input-char, or keyboard
+*	macros.  You'd be surprised how easy it is to break this.
+*
+*/
+#include <config.h>
+#include "lisp.h"
+#include "buffer.h"
+#include "commands.h"
+#include "device.h"
+#include "elhash.h"
+#include "events.h"
+#include "frame.h"
+#include "insdel.h"		/* for buffer_reset_changes */
+#include "keymap.h"
+#include "lstream.h"
+#include "macros.h"		/* for defining_keyboard_macro */
+#include "opaque.h"
+#include "process.h"
+#include "window.h"
+#include "sysdep.h"		/* init_poll_for_quit() */
+#include "syssignal.h"		/* SIGCHLD, etc. */
+#include "systime.h"		/* to set Vlast_input_time */
+#include <errno.h>
+/* The number of keystrokes between auto-saves. */
+static int auto_save_interval;
+Lisp_Object Qundefined_keystroke_sequence;
+Lisp_Object Qcommand_execute;
+Lisp_Object Qcommand_event_p;
+/* Hooks to run before and after each command.  */
+Lisp_Object Vpre_command_hook, Vpost_command_hook;
+Lisp_Object Qpre_command_hook, Qpost_command_hook;
+/* Hook run when XEmacs is about to be idle. */
+Lisp_Object Qpre_idle_hook, Vpre_idle_hook;
+#ifdef ILL_CONCEIVED_HOOK
+/* Hook run after a command if there's no more input soon.  */
+Lisp_Object Qpost_command_idle_hook, Vpost_command_idle_hook;
+/* Delay time in microseconds before running post-command-idle-hook.  */
+int post_command_idle_delay;
+#endif /* ILL_CONCEIVED_HOOK */
+#ifdef DEFERRED_ACTION_CRAP
+/* List of deferred actions to be performed at a later time.
+The precise format isn't relevant here; we just check whether it is nil.  */
+Lisp_Object Vdeferred_action_list;
+/* Function to call to handle deferred actions, when there are any.  */
+Lisp_Object Vdeferred_action_function;
+Lisp_Object Qdeferred_action_function;
+#endif /* DEFERRED_ACTION_CRAP */
+/* Non-nil disable property on a command means
+do not execute it; call disabled-command-hook's value instead. */
+Lisp_Object Qdisabled, Vdisabled_command_hook;
+static void pre_command_hook (void);
+static void post_command_hook (void);
+/* Last keyboard or mouse input event read as a command. */
+Lisp_Object Vlast_command_event;
+/* The nearest ASCII equivalent of the above. */
+Lisp_Object Vlast_command_char;
+/* Last keyboard or mouse event read for any purpose. */
+Lisp_Object Vlast_input_event;
+/* The nearest ASCII equivalent of the above. */
+Lisp_Object Vlast_input_char;
+Lisp_Object Vcurrent_mouse_event;
+/* If not Qnil, event objects to be read as the next command input */
+Lisp_Object Vunread_command_events;
+Lisp_Object Vunread_command_event; /* obsoleteness support */
+static Lisp_Object Qunread_command_events, Qunread_command_event;
+/* Previous command, represented by a Lisp object.
+Does not include prefix commands and arg setting commands */
+Lisp_Object Vlast_command;
+/* If a command sets this, the value goes into
+previous-command for the next command. */
+Lisp_Object Vthis_command;
+/* The value of point when the last command was executed.  */
+Bufpos last_point_position;
+/* The frame that was current when the last command was started. */
+Lisp_Object Vlast_selected_frame;
+/* The buffer that was current when the last command was started.  */
+Lisp_Object last_point_position_buffer;
+/* A (16bit . 16bit) representation of the time of the last-command-event.
+*/
+Lisp_Object Vlast_input_time;
+/* Character to recognize as the help char.  */
+Lisp_Object Vhelp_char;
+/* Form to execute when help char is typed.  */
+Lisp_Object Vhelp_form;
+/* Flag to tell QUIT that some interesting occurrence (e.g. a keypress)
+may have happened. */
+volatile int something_happened;
+/* Command to run when the help character follows a prefix key.  */
+Lisp_Object Vprefix_help_command;
+/* Hash table to translate keysyms through */
+Lisp_Object Vkeyboard_translate_table;
+/* If control-meta-super-shift-X is undefined, try control-meta-super-x */
+Lisp_Object Vretry_undefined_key_binding_unshifted;
+Lisp_Object Qretry_undefined_key_binding_unshifted;
+/* Console that corresponds to our controlling terminal */
+Lisp_Object Vcontrolling_terminal;
+/* An event (actually an event chain linked through event_next) or Qnil.
+*/
+Lisp_Object Vthis_command_keys;
+Lisp_Object Vthis_command_keys_tail;
+/* #### kludge! */
+Lisp_Object Qauto_show_make_point_visible;
+/* File in which we write all commands we read; an lstream */
+static Lisp_Object Vdribble_file;
+#ifdef DEBUG_XEMACS
+int debug_emacs_events;
+#endif
+/* The callback routines for the window system or terminal driver */
+struct event_stream *event_stream;
+/* This structure is what we use to excapsulate the state of a command sequence
+being composed; key events are executed by adding themselves to the command
+builder; if the command builder is then complete (does not still represent
+a prefix key sequence) it executes the corresponding command.
+*/
+struct command_builder
+{
+struct lcrecord_header header;
+Lisp_Object console; /* back pointer to the console this command
+			  builder is for */
+/* Qnil, or a Lisp_Event representing the first event read
+*  after the last command completed.  Threaded. */
+/* #### NYI */
+Lisp_Object prefix_events;
+/* Qnil, or a Lisp_Event representing event in the current
+*  keymap-lookup sequence.  Subsequent events are threaded via
+*  the event's next slot */
+Lisp_Object current_events;
+/* Last elt of above  */
+Lisp_Object most_current_event;
+/* Last elt before function map code took over.
+What this means is: All prefixes up to (but not including)
+this event have non-nil bindings, but the prefix including
+this event has a nil binding.  Any events in the chain after
+this one were read solely because we're part of a possible
+function key.  If we end up with something that's not part
+of a possible function key, we have to unread all of those
+events. */
+Lisp_Object last_non_munged_event;
+/* One set of values for function-key-map, one for key-translation-map */
+struct munging_key_translation
+{
+/* First event that can begin a possible function key sequence
+	 (to be translated according to function-key-map).  Normally
+	 this is the first event in the chain.  However, once we've
+	 translated a sequence through function-key-map, this will
+	 point to the first event after the translated sequence:
+	 we don't ever want to translate any events twice through
+	 function-key-map, or things could get really screwed up
+	 (e.g. if the user created a translation loop).  If this
+	 is nil, then the next-read event is the first that can
+	 begin a function key sequence. */
+Lisp_Object first_mungeable_event;
+} munge_me[2];
+Bufbyte *echo_buf;
+Bytecount echo_buf_length;          /* size of echo_buf */
+Bytecount echo_buf_index;           /* index into echo_buf
+				       * -1 before doing echoing for new cmd */
+/* Self-insert-command is magic in that it doesn't always push an undo-
+boundary: up to 20 consecutive self-inserts can happen before an undo-
+boundary is pushed.  This variable is that counter.
+*/
+int self_insert_countdown;
+};
+static void echo_key_event (struct command_builder *, Lisp_Object event);
+static void maybe_kbd_translate (Lisp_Object event);
+/* This structure is basically a typeahead queue: things like
+wait-reading-process-output will delay the execution of
+keyboard and mouse events by pushing them here.
+Chained through event_next()
+command_event_queue_tail is a pointer to the last-added element.
+*/
+static Lisp_Object command_event_queue;
+static Lisp_Object command_event_queue_tail;
+/* Nonzero means echo unfinished commands after this many seconds of pause. */
+static int echo_keystrokes;
+/* The number of keystrokes since the last auto-save. */
+static int keystrokes_since_auto_save;
+/* Used by the C-g signal handler so that it will never "hard quit"
+when waiting for an event.  Otherwise holding down C-g could
+cause a suspension back to the shell, which is generally
+undesirable. (#### This doesn't fully work.) */
+int emacs_is_blocking;
+/**********************************************************************/
+/*                       Command-builder object                       */
+/**********************************************************************/
+#define XCOMMAND_BUILDER(x) \
+XRECORD (x, command_builder, struct command_builder)
+#define XSETCOMMAND_BUILDER(x, p) XSETRECORD (x, p, command_builder)
+#define COMMAND_BUILDERP(x) RECORDP (x, command_builder)
+#define GC_COMMAND_BUILDERP(x) GC_RECORDP (x, command_builder)
+#define CHECK_COMMAND_BUILDER(x) CHECK_RECORD (x, command_builder)
+static Lisp_Object mark_command_builder (Lisp_Object obj,
+					  void (*markobj) (Lisp_Object));
+static void finalize_command_builder (void *header, int for_disksave);
+DEFINE_LRECORD_IMPLEMENTATION ("command-builder", command_builder,
+mark_command_builder, internal_object_printer,
+			       finalize_command_builder, 0, 0,
+			       struct command_builder);
+static Lisp_Object
+mark_command_builder (Lisp_Object obj, void (*markobj) (Lisp_Object))
+{
+struct command_builder *builder = XCOMMAND_BUILDER (obj);
+(markobj) (builder->prefix_events);
+(markobj) (builder->current_events);
+(markobj) (builder->most_current_event);
+(markobj) (builder->last_non_munged_event);
+(markobj) (builder->munge_me[0].first_mungeable_event);
+(markobj) (builder->munge_me[1].first_mungeable_event);
+return builder->console;
+}
+static void
+finalize_command_builder (void *header, int for_disksave)
+{
+struct command_builder *c = (struct command_builder *) header;
+if (!for_disksave)
+{
+xfree (c->echo_buf);
+c->echo_buf = 0;
+}
+}
+static void
+reset_command_builder_event_chain (struct command_builder *builder)
+{
+builder->prefix_events = Qnil;
+builder->current_events = Qnil;
+builder->most_current_event = Qnil;
+builder->last_non_munged_event = Qnil;
+builder->munge_me[0].first_mungeable_event = Qnil;
+builder->munge_me[1].first_mungeable_event = Qnil;
+}
+Lisp_Object
+allocate_command_builder (Lisp_Object console)
+{
+Lisp_Object builder_obj = Qnil;
+struct command_builder *builder =
+alloc_lcrecord (sizeof (struct command_builder),
+		    lrecord_command_builder);
+builder->console = console;
+reset_command_builder_event_chain (builder);
+builder->echo_buf_length = 300; /* #### Kludge */
+builder->echo_buf =
+(Bufbyte *) xmalloc (builder->echo_buf_length);
+builder->echo_buf[0] = 0;
+builder->echo_buf_index = -1;
+builder->echo_buf_index = -1;
+builder->self_insert_countdown = 0;
+XSETCOMMAND_BUILDER (builder_obj, builder);
+return builder_obj;
+}
+static void
+command_builder_append_event (struct command_builder *builder,
+			      Lisp_Object event)
+{
+assert (EVENTP (event));
+if (EVENTP (builder->most_current_event))
+XSET_EVENT_NEXT (builder->most_current_event, event);
+else
+builder->current_events = event;
+builder->most_current_event = event;
+if (NILP (builder->munge_me[0].first_mungeable_event))
+builder->munge_me[0].first_mungeable_event = event;
+if (NILP (builder->munge_me[1].first_mungeable_event))
+builder->munge_me[1].first_mungeable_event = event;
+}
+/**********************************************************************/
+/*             Low-level interfaces onto event methods                */
+/**********************************************************************/
+enum event_stream_operation
+{
+EVENT_STREAM_PROCESS,
+EVENT_STREAM_TIMEOUT,
+EVENT_STREAM_CONSOLE,
+EVENT_STREAM_READ
+};
+static void
+check_event_stream_ok (enum event_stream_operation op)
+{
+if (!event_stream && noninteractive)
+{
+switch (op)
+	{
+	case EVENT_STREAM_PROCESS:
+	  error ("Can't start subprocesses in -batch mode");
+	case EVENT_STREAM_TIMEOUT:
+	  error ("Can't add timeouts in -batch mode");
+	case EVENT_STREAM_CONSOLE:
+	  error ("Can't add consoles in -batch mode");
+	case EVENT_STREAM_READ:
+	  error ("Can't read events in -batch mode");
+	default:
+	  abort ();
+	}
+}
+else if (!event_stream)
+{
+error ("event-stream callbacks not initialized (internal error?)");
+}
+}
+int
+event_stream_event_pending_p (int user)
+{
+if (!event_stream)
+return 0;
+return event_stream->event_pending_p (user);
+}
+static int
+maybe_read_quit_event (struct Lisp_Event *event)
+{
+/* A C-g that came from `sigint_happened' will always come from the
+controlling terminal.  If that doesn't exist, however, then the
+user manually sent us a SIGINT, and we pretend the C-g came from
+the selected console. */
+struct console *con;
+if (CONSOLEP (Vcontrolling_terminal) &&
+CONSOLE_LIVE_P (XCONSOLE (Vcontrolling_terminal)))
+con = XCONSOLE (Vcontrolling_terminal);
+else
+con = XCONSOLE (Fselected_console ());
+if (sigint_happened)
+{
+int ch = CONSOLE_QUIT_CHAR (con);
+sigint_happened = 0;
+Vquit_flag = Qnil;
+character_to_event (ch, event, con, 1);
+event->channel = make_console (con);
+return 1;
+}
+return 0;
+}
+void
+event_stream_next_event (struct Lisp_Event *event)
+{
+Lisp_Object event_obj = Qnil;
+check_event_stream_ok (EVENT_STREAM_READ);
+XSETEVENT (event_obj, event);
+zero_event (event);
+/* If C-g was pressed, treat it as a character to be read.
+Note that if C-g was pressed while we were blocking,
+the SIGINT signal handler will be called.  It will
+set Vquit_flag and write a byte on our "fake pipe",
+which will unblock us. */
+if (maybe_read_quit_event (event))
+{
+#ifdef DEBUG_XEMACS
+if (debug_emacs_events)
+	{
+	  write_c_string ("(SIGINT) ",
+			  Qexternal_debugging_output);
+	  print_internal (event_obj, Qexternal_debugging_output, 1);
+	  write_c_string ("\n", Qexternal_debugging_output);
+	}
+#endif
+return;
+}
+/* If a longjmp() happens in the callback, we're screwed.
+Let's hope it doesn't.  I think the code here is fairly
+clean and doesn't do this. */
+emacs_is_blocking = 1;
+#if 0
+/* Do this if the poll-for-quit timer seems to be taking too
+much CPU time when idle ... */
+reset_poll_for_quit ();
+#endif
+event_stream->next_event_cb (event);
+#if 0
+init_poll_for_quit ();
+#endif
+emacs_is_blocking = 0;
+#ifdef DEBUG_XEMACS
+if (debug_emacs_events)
+{
+write_c_string ("(real) ",
+		      Qexternal_debugging_output);
+/* timeout events have more info set later, so
+	 print the event out in next_event_internal(). */
+if (event->event_type != timeout_event)
+	{
+	  print_internal (event_obj, Qexternal_debugging_output, 1);
+	  write_c_string ("\n", Qexternal_debugging_output);
+	}
+}
+#endif
+maybe_kbd_translate (event_obj);
+}
+void
+event_stream_handle_magic_event (struct Lisp_Event *event)
+{
+check_event_stream_ok (EVENT_STREAM_READ);
+event_stream->handle_magic_event_cb (event);
+}
+static int
+event_stream_add_timeout (EMACS_TIME timeout)
+{
+check_event_stream_ok (EVENT_STREAM_TIMEOUT);
+return event_stream->add_timeout_cb (timeout);
+}
+static void
+event_stream_remove_timeout (int id)
+{
+check_event_stream_ok (EVENT_STREAM_TIMEOUT);
+event_stream->remove_timeout_cb (id);
+}
+void
+event_stream_select_console (struct console *con)
+{
+check_event_stream_ok (EVENT_STREAM_CONSOLE);
+if (!con->input_enabled)
+{
+event_stream->select_console_cb (con);
+con->input_enabled = 1;
+}
+}
+void
+event_stream_unselect_console (struct console *con)
+{
+check_event_stream_ok (EVENT_STREAM_CONSOLE);
+if (con->input_enabled)
+{
+event_stream->unselect_console_cb (con);
+con->input_enabled = 0;
+}
+}
+void
+event_stream_select_process (struct Lisp_Process *proc)
+{
+check_event_stream_ok (EVENT_STREAM_PROCESS);
+if (!get_process_selected_p (proc))
+{
+event_stream->select_process_cb (proc);
+set_process_selected_p (proc, 1);
+}
+}
+void
+event_stream_unselect_process (struct Lisp_Process *proc)
+{
+check_event_stream_ok (EVENT_STREAM_PROCESS);
+if (get_process_selected_p (proc))
+{
+event_stream->unselect_process_cb (proc);
+set_process_selected_p (proc, 0);
+}
+}
+void
+event_stream_quit_p (void)
+{
+if (event_stream)
+event_stream->quit_p_cb ();
+}
+/**********************************************************************/
+/*                      Character prompting                           */
+/**********************************************************************/
+static void
+echo_key_event (struct command_builder *command_builder,
+		Lisp_Object event)
+{
+/* This function can GC */
+char buf[255];
+Bytecount buf_index = command_builder->echo_buf_index;
+Bufbyte *e;
+Bytecount len;
+if (buf_index < 0)
+{
+buf_index = 0;              /* We're echoing now */
+clear_echo_area (selected_frame (), Qnil, 0);
+}
+format_event_object (buf, XEVENT (event), 1);
+len = strlen (buf);
+if (len + buf_index + 4 > command_builder->echo_buf_length)
+return;
+e = command_builder->echo_buf + buf_index;
+memcpy (e, buf, len);
+e += len;
+e[0] = ' ';
+e[1] = '-';
+e[2] = ' ';
+e[3] = 0;
+command_builder->echo_buf_index = buf_index + len + 1;
+}
+static void
+regenerate_echo_keys_from_this_command_keys (struct command_builder *
+					     builder)
+{
+Lisp_Object event;
+builder->echo_buf_index = 0;
+EVENT_CHAIN_LOOP (event, Vthis_command_keys)
+echo_key_event (builder, event);
+}
+static void
+maybe_echo_keys (struct command_builder *command_builder, int no_snooze)
+{
+/* This function can GC */
+struct frame *f = selected_frame ();
+/* Message turns off echoing unless more keystrokes turn it on again. */
+if (echo_area_active (f) && !EQ (Qcommand, echo_area_status (f)))
+return;
+if (minibuf_level == 0
+&& echo_keystrokes > 0)
+{
+if (!no_snooze)
+	{
+	  /* #### C-g here will cause QUIT.  Setting dont_check_for_quit
+	     doesn't work.  See check_quit. */
+	  if (NILP (Fsit_for (make_int (echo_keystrokes), Qnil)))
+	    /* input came in, so don't echo. */
+	    return;
+	}
+echo_area_message (f, command_builder->echo_buf, Qnil, 0,
+			 /* not echo_buf_index.  That doesn't include
+			    the terminating " - ". */
+			 strlen ((char *) command_builder->echo_buf),
+			 Qcommand);
+}
+}
+static void
+reset_key_echo (struct command_builder *command_builder,
+int remove_echo_area_echo)
+{
+/* This function can GC */
+struct frame *f = selected_frame ();
+command_builder->echo_buf_index = -1;
+if (remove_echo_area_echo)
+clear_echo_area (f, Qcommand, 0);
+}
+/**********************************************************************/
+/*                          random junk                               */
+/**********************************************************************/
+static void
+maybe_kbd_translate (Lisp_Object event)
+{
+Emchar c;
+int did_translate = 0;
+if (XEVENT_TYPE (event) != key_press_event)
+return;
+if (!HASHTABLEP (Vkeyboard_translate_table))
+return;
+if (EQ (Fhashtable_fullness (Vkeyboard_translate_table), Qzero))
+return;
+c = event_to_character (XEVENT (event), 0, 0, 0);
+if (c != -1)
+{
+Lisp_Object traduit = Fgethash (make_char (c), Vkeyboard_translate_table,
+				      Qnil);
+if (!NILP (traduit) && SYMBOLP (traduit))
+	{
+	  XEVENT (event)->event.key.keysym = traduit;
+	  XEVENT (event)->event.key.modifiers = 0;
+	  did_translate = 1;
+	}
+else if (CHARP (traduit))
+	{
+	  struct Lisp_Event ev2;
+	  /* This used to call Fcharacter_to_event() directly into EVENT,
+	     but that can eradicate timestamps and other such stuff.
+	     This way is safer. */
+	  zero_event (&ev2);
+	  character_to_event (XCHAR (traduit), &ev2,
+			      XCONSOLE (EVENT_CHANNEL (XEVENT (event))), 1);
+	  XEVENT (event)->event.key.keysym = ev2.event.key.keysym;
+	  XEVENT (event)->event.key.modifiers = ev2.event.key.modifiers;
+	  did_translate = 1;
+	}
+}
+if (!did_translate)
+{
+Lisp_Object traduit = Fgethash (XEVENT (event)->event.key.keysym,
+				      Vkeyboard_translate_table, Qnil);
+if (!NILP (traduit) && SYMBOLP (traduit))
+	{
+	  XEVENT (event)->event.key.keysym = traduit;
+	  did_translate = 1;
+	}
+}
+#ifdef DEBUG_XEMACS
+if (did_translate && debug_emacs_events)
+{
+write_c_string ("(->keyboard-translate-table) ",
+		      Qexternal_debugging_output);
+print_internal (event, Qexternal_debugging_output, 1);
+write_c_string ("\n", Qexternal_debugging_output);
+}
+#endif
+}
+/* NB: The following auto-save stuff is in keyboard.c in FSFmacs, and
+keystrokes_since_auto_save is equivalent to the difference between
+num_nonmacro_input_chars and last_auto_save. */
+/* When an auto-save happens, record the "time", and don't do again soon.  */
+void
+record_auto_save (void)
+{
+keystrokes_since_auto_save = 0;
+}
+/* Make an auto save happen as soon as possible at command level.  */
+void
+force_auto_save_soon (void)
+{
+keystrokes_since_auto_save = 1 + max (auto_save_interval, 20);
+#if 0 /* FSFmacs */
+record_asynch_buffer_change ();
+#endif
+}
+static void
+maybe_do_auto_save (void)
+{
+/* This function can GC */
+keystrokes_since_auto_save++;
+if (auto_save_interval > 0 &&
+keystrokes_since_auto_save > max (auto_save_interval, 20) &&
+!detect_input_pending ())
+{
+Fdo_auto_save (Qnil, Qnil);
+record_auto_save ();
+}
+}
+static Lisp_Object
+print_help (Lisp_Object object)
+{
+Fprinc (object, Qnil);
+return Qnil;
+}
+static void
+execute_help_form (struct command_builder *command_builder,
+Lisp_Object event)
+{
+/* This function can GC */
+Lisp_Object help = Qnil;
+int speccount = specpdl_depth ();
+Bytecount buf_index = command_builder->echo_buf_index;
+Lisp_Object echo = ((buf_index <= 0)
+? Qnil
+: make_string (command_builder->echo_buf,
+				     buf_index));
+struct gcpro gcpro1, gcpro2;
+GCPRO2 (echo, help);
+record_unwind_protect (save_window_excursion_unwind,
+			 Fcurrent_window_configuration (Qnil));
+reset_key_echo (command_builder, 1);
+help = Feval (Vhelp_form);
+if (STRINGP (help))
+internal_with_output_to_temp_buffer ("*Help*",
+					 print_help, help, Qnil);
+Fnext_command_event (event, Qnil);
+/* Remove the help from the frame */
+unbind_to (speccount, Qnil);
+/* Hmmmm.  Tricky.  The unbind restores an old window configuration,
+apparently bypassing any setting of windows_structure_changed.
+So we need to set it so that things get redrawn properly. */
+/* #### This is massive overkill.  Look at doing it better once the
+new redisplay is fully in place. */
+{
+Lisp_Object frmcons, devcons, concons;
+FRAME_LOOP_NO_BREAK (frmcons, devcons, concons)
+{
+	MARK_FRAME_WINDOWS_STRUCTURE_CHANGED (XFRAME (XCAR (frmcons)));
+}
+}
+redisplay ();
+if (event_matches_key_specifier_p (XEVENT (event), make_char (' ')))
+{
+/* Discard next key if is is a space */
+reset_key_echo (command_builder, 1);
+Fnext_command_event (event, Qnil);
+}
+command_builder->echo_buf_index = buf_index;
+if (buf_index > 0)
+memcpy (command_builder->echo_buf,
+string_data (XSTRING (echo)), buf_index + 1); /* terminating 0 */
+UNGCPRO;
+}
+/**********************************************************************/
+/*                          input pending                             */
+/**********************************************************************/
+int
+detect_input_pending (void)
+{
+/* Always call the event_pending_p hook even if there's an unread
+character, because that might do some needed ^G detection (on
+systems without SIGIO, for example).
+*/
+if (event_stream_event_pending_p (1))
+return 1;
+if (!NILP (Vunread_command_events) || !NILP (Vunread_command_event))
+return 1;
+if (!NILP (command_event_queue))
+{
+Lisp_Object event;
+EVENT_CHAIN_LOOP (event, command_event_queue)
+	{
+	  if (XEVENT_TYPE (event) != eval_event
+	      && XEVENT_TYPE (event) != magic_eval_event)
+	    return (1);
+	}
+}
+return 0;
+}
+DEFUN ("input-pending-p", Finput_pending_p, Sinput_pending_p, 0, 0, 0 /*
+T if command input is currently available with no waiting.
+Actually, the value is nil only if we can be sure that no input is available.
+*/ )
+()
+{
+return ((detect_input_pending ()) ? Qt : Qnil);
+}
+/**********************************************************************/
+/*                            timeouts                                */
+/**********************************************************************/
+/**** Low-level timeout functions. ****
+These functions maintain a sorted list of one-shot timeouts (where
+the timeouts are in absolute time).  They are intended for use by
+functions that need to convert a list of absolute timeouts into a
+series of intervals to wait for. */
+/* We ensure that 0 is never a valid ID, so that a value of 0 can be
+used to indicate an absence of a timer. */
+static int low_level_timeout_id_tick;
+struct low_level_timeout_blocktype
+{
+Blocktype_declare (struct low_level_timeout);
+} *the_low_level_timeout_blocktype;
+/* Add a one-shot timeout at time TIME to TIMEOUT_LIST.  Return
+a unique ID identifying the timeout. */
+int
+add_low_level_timeout (struct low_level_timeout **timeout_list,
+		       EMACS_TIME thyme)
+{
+struct low_level_timeout *tm;
+struct low_level_timeout *t, **tt;
+/* Allocate a new time struct. */
+tm = Blocktype_alloc (the_low_level_timeout_blocktype);
+tm->next = NULL;
+if (low_level_timeout_id_tick == 0)
+low_level_timeout_id_tick++;
+tm->id = low_level_timeout_id_tick++;
+tm->time = thyme;
+/* Add it to the queue. */
+tt = timeout_list;
+t  = *tt;
+while (t && EMACS_TIME_EQUAL_OR_GREATER (tm->time, t->time))
+{
+tt = &t->next;
+t  = *tt;
+}
+tm->next = t;
+*tt = tm;
+return tm->id;
+}
+/* Remove the low-level timeout identified by ID from TIMEOUT_LIST.
+If the timeout is not there, do nothing. */
+void
+remove_low_level_timeout (struct low_level_timeout **timeout_list, int id)
+{
+struct low_level_timeout *t, *prev;
+/* find it */
+for (t = *timeout_list, prev = NULL; t && t->id != id; t = t->next)
+prev = t;
+if (!t)
+return; /* couldn't find it */
+if (!prev)
+*timeout_list = t->next;
+else prev->next = t->next;
+Blocktype_free (the_low_level_timeout_blocktype, t);
+}
+/* If there are timeouts on TIMEOUT_LIST, store the relative time
+interval to the first timeout on the list into INTERVAL and
+return 1.  Otherwise, return 0. */
+int
+get_low_level_timeout_interval (struct low_level_timeout *timeout_list,
+				EMACS_TIME *interval)
+{
+if (!timeout_list) /* no timer events; block indefinitely */
+return 0;
+else
+{
+EMACS_TIME current_time;
+/* The time to block is the difference between the first
+	 (earliest) timer on the queue and the current time.
+	 If that is negative, then the timer will fire immediately
+	 but we still have to call select(), with a zero-valued
+	 timeout: user events must have precedence over timer events. */
+EMACS_GET_TIME (current_time);
+if (EMACS_TIME_GREATER (timeout_list->time, current_time))
+	EMACS_SUB_TIME (*interval, timeout_list->time,
+			current_time);
+else
+	EMACS_SET_SECS_USECS (*interval, 0, 0);
+return 1;
+}
+}
+/* Pop the first (i.e. soonest) timeout off of TIMEOUT_LIST and return
+its ID.  Also, if TIME_OUT is not 0, store the absolute time of the
+timeout into TIME_OUT. */
+int
+pop_low_level_timeout (struct low_level_timeout **timeout_list,
+		       EMACS_TIME *time_out)
+{
+struct low_level_timeout *tm = *timeout_list;
+int id;
+assert (tm);
+id = tm->id;
+if (time_out)
+*time_out = tm->time;
+*timeout_list = tm->next;
+Blocktype_free (the_low_level_timeout_blocktype, tm);
+return id;
+}
+/**** High-level timeout functions. ****/
+static int timeout_id_tick;
+/* Since timeout structures contain Lisp_Objects, they need to be GC'd
+properly.  The opaque data type provides a convenient way of doing
+this without having to create a new Lisp object, since we can
+provide our own mark function. */
+struct timeout
+{
+int id; /* Id we use to identify the timeout over its lifetime */
+int interval_id; /* Id for this particular interval; this may
+		      be different each time the timeout is
+		      signalled.*/
+Lisp_Object function, object; /* Function and object associated
+				   with timeout. */
+EMACS_TIME next_signal_time;  /* Absolute time when the timeout
+				   is next going to be signalled. */
+unsigned int resignal_msecs;  /* How far after the next timeout
+				   should the one after that
+				   occur? */
+};
+static Lisp_Object pending_timeout_list, pending_async_timeout_list;
+static Lisp_Object Vtimeout_free_list;
+static Lisp_Object
+mark_timeout (Lisp_Object obj, void (*markobj) (Lisp_Object))
+{
+struct timeout *tm = (struct timeout *) XOPAQUE_DATA (obj);
+(markobj) (tm->function);
+return tm->object;
+}
+/* Generate a timeout and return its ID. */
+int
+event_stream_generate_wakeup (unsigned int milliseconds,
+			      unsigned int vanilliseconds,
+			      Lisp_Object function, Lisp_Object object,
+			      int async_p)
+{
+Lisp_Object op = allocate_managed_opaque (Vtimeout_free_list, 0);
+struct timeout *timeout = (struct timeout *) XOPAQUE_DATA (op);
+EMACS_TIME current_time;
+EMACS_TIME interval;
+timeout->id = timeout_id_tick++;
+timeout->resignal_msecs = vanilliseconds;
+timeout->function = function;
+timeout->object = object;
+EMACS_GET_TIME (current_time);
+EMACS_SET_SECS_USECS (interval, milliseconds / 1000,
+			1000 * (milliseconds % 1000));
+EMACS_ADD_TIME (timeout->next_signal_time, current_time, interval);
+if (async_p)
+{
+timeout->interval_id =
+	event_stream_add_async_timeout (timeout->next_signal_time);
+pending_async_timeout_list = noseeum_cons (op,
+						 pending_async_timeout_list);
+}
+else
+{
+timeout->interval_id =
+	event_stream_add_timeout (timeout->next_signal_time);
+pending_timeout_list = noseeum_cons (op, pending_timeout_list);
+}
+return timeout->id;
+}
+/* Given the INTERVAL-ID of a timeout just signalled, resignal the timeout
+as necessary and return the timeout's ID and function and object slots.
+This should be called as a result of receiving notice that a timeout
+has fired.  INTERVAL-ID is *not* the timeout's ID, but is the ID that
+identifies this particular firing of the timeout.  INTERVAL-ID's and
+timeout ID's are in separate number spaces and bear no relation to
+each other.  The INTERVAL-ID is all that the event callback routines
+work with: they work only with one-shot intervals, not with timeouts
+that may fire repeatedly.
+NOTE: The returned FUNCTION and OBJECT are *not* GC-protected at all.
+*/
+static int
+event_stream_resignal_wakeup (int interval_id, int async_p,
+			      Lisp_Object *function, Lisp_Object *object)
+{
+Lisp_Object op = Qnil, rest;
+struct timeout *timeout;
+Lisp_Object *timeout_list;
+struct gcpro gcpro1;
+int id;
+GCPRO1 (op); /* just in case ...  because it's removed from the list
+		  for awhile. */
+if (async_p)
+timeout_list = &pending_async_timeout_list;
+else
+timeout_list = &pending_timeout_list;
+/* Find the timeout on the list of pending ones. */
+LIST_LOOP (rest, *timeout_list)
+{
+timeout = (struct timeout *) XOPAQUE_DATA (XCAR (rest));
+if (timeout->interval_id == interval_id)
+	break;
+}
+assert (!NILP (rest));
+op = XCAR (rest);
+timeout = (struct timeout *) XOPAQUE_DATA (op);
+/* We make sure to snarf the data out of the timeout object before
+we free it with free_managed_opaque(). */
+id = timeout->id;
+*function = timeout->function;
+*object = timeout->object;
+/* Remove this one from the list of pending timeouts */
+*timeout_list = delq_no_quit_and_free_cons (op, *timeout_list);
+/* If this timeout wants to be resignalled, do it now. */
+if (timeout->resignal_msecs)
+{
+EMACS_TIME current_time;
+EMACS_TIME interval;
+/* Determine the time that the next resignalling should occur.
+	 We do that by adding the interval time to the last signalled
+	 time until we get a time that's current.
+	 (This way, it doesn't matter if the timeout was signalled
+	 exactly when we asked for it, or at some time later.)
+	 */
+EMACS_GET_TIME (current_time);
+EMACS_SET_SECS_USECS (interval, timeout->resignal_msecs / 1000,
+			    1000 * (timeout->resignal_msecs % 1000));
+do
+	{
+	  EMACS_ADD_TIME (timeout->next_signal_time, timeout->next_signal_time,
+			  interval);
+	} while (EMACS_TIME_GREATER (current_time, timeout->next_signal_time));
+if (async_p)
+timeout->interval_id =
+	  event_stream_add_async_timeout (timeout->next_signal_time);
+else
+timeout->interval_id =
+	  event_stream_add_timeout (timeout->next_signal_time);
+/* Add back onto the list.  Note that the effect of this
+is to move frequently-hit timeouts to the front of the
+	 list, which is a good thing. */
+*timeout_list = noseeum_cons (op, *timeout_list);
+}
+else
+free_managed_opaque (Vtimeout_free_list, op);
+UNGCPRO;
+return id;
+}
+void
+event_stream_disable_wakeup (int id, int async_p)
+{
+struct timeout *timeout = 0;
+Lisp_Object rest = Qnil;
+Lisp_Object *timeout_list;
+if (async_p)
+timeout_list = &pending_async_timeout_list;
+else
+timeout_list = &pending_timeout_list;
+/* Find the timeout on the list of pending ones, if it's still there. */
+LIST_LOOP (rest, *timeout_list)
+{
+timeout = (struct timeout *) XOPAQUE_DATA (XCAR (rest));
+if (timeout->id == id)
+	break;
+}
+/* If we found it, remove it from the list and disable the pending
+one-shot. */
+if (!NILP (rest))
+{
+Lisp_Object op = XCAR (rest);
+*timeout_list =
+	delq_no_quit_and_free_cons (op, *timeout_list);
+if (async_p)
+	event_stream_remove_async_timeout (timeout->interval_id);
+else
+	event_stream_remove_timeout (timeout->interval_id);
+free_managed_opaque (Vtimeout_free_list, op);
+}
+}
+/**** Asynch. timeout functions (see also signal.c) ****/
+#if !defined (SIGIO) && !defined (DONT_POLL_FOR_QUIT)
+extern int poll_for_quit_id;
+#endif
+#ifndef SIGCHLD
+extern int poll_for_sigchld_id;
+#endif
+void
+event_stream_deal_with_async_timeout (int interval_id)
+{
+/* This function can GC */
+Lisp_Object humpty, dumpty;
+#if (!defined (SIGIO) && !defined (DONT_POLL_FOR_QUIT)) || !defined (SIGCHLD)
+int id =
+#endif
+event_stream_resignal_wakeup (interval_id, 1, &humpty, &dumpty);
+#if !defined (SIGIO) && !defined (DONT_POLL_FOR_QUIT)
+if (id == poll_for_quit_id)
+{
+quit_check_signal_happened = 1;
+quit_check_signal_tick_count++;
+return;
+}
+#endif
+#if !defined (SIGCHLD)
+if (id == poll_for_sigchld_id)
+{
+kick_status_notify ();
+return;
+}
+#endif
+/* call1 GC-protects its arguments */
+call1_trapping_errors ("Error in asynchronous timeout callback",
+			 humpty, dumpty);
+}
+/**** Lisp-level timeout functions. ****/
+static unsigned long
+lisp_number_to_milliseconds (Lisp_Object secs, int allow_0)
+{
+unsigned long msecs;
+#ifdef LISP_FLOAT_TYPE
+double fsecs;
+CHECK_INT_OR_FLOAT (secs);
+fsecs = XFLOATINT (secs);
+#else
+long fsecs;
+CHECK_INT_OR_FLOAT (secs);
+fsecs = XINT (secs);
+#endif
+msecs = 1000 * fsecs;
+if (fsecs < 0)
+signal_simple_error ("timeout is negative", secs);
+if (!allow_0 && fsecs == 0)
+signal_simple_error ("timeout is non-positive", secs);
+if (fsecs >= (((unsigned int) 0xFFFFFFFF) / 1000))
+signal_simple_error
+("timeout would exceed 32 bits when represented in milliseconds", secs);
+return msecs;
+}
+DEFUN ("add-timeout", Fadd_timeout, Sadd_timeout, 3, 4, 0 /*
+Add a timeout, to be signaled after the timeout period has elapsed.
+SECS is a number of seconds, expressed as an integer or a float.
+FUNCTION will be called after that many seconds have elapsed, with one
+argument, the given OBJECT.  If the optional RESIGNAL argument is provided,
+then after this timeout expires, `add-timeout' will automatically be called
+again with RESIGNAL as the first argument.
+This function returns an object which is the id number of this particular
+timeout.  You can pass that object to `disable-timeout' to turn off the
+timeout before it has been signalled.
+NOTE: Id numbers as returned by this function are in a distinct namespace
+from those returned by `add-async-timeout'.  This means that the same id
+number could refer to a pending synchronous timeout and a different pending
+asynchronous timeout, and that you cannot pass an id from `add-timeout'
+to `disable-async-timeout', or vice-versa.
+The number of seconds may be expressed as a floating-point number, in which
+case some fractional part of a second will be used.  Caveat: the usable
+timeout granularity will vary from system to system.
+Adding a timeout causes a timeout event to be returned by `next-event', and
+the function will be invoked by `dispatch-event,' so if emacs is in a tight
+loop, the function will not be invoked until the next call to sit-for or
+until the return to top-level (the same is true of process filters).
+If you need to have a timeout executed even when XEmacs is in the midst of
+running Lisp code, use `add-async-timeout'.
+WARNING: if you are thinking of calling add-timeout from inside of a
+callback function as a way of resignalling a timeout, think again.  There
+is a race condition.  That's why the RESIGNAL argument exists.
+*/ )
+(secs, function, object, resignal)
+Lisp_Object secs, function, object, resignal;
+{
+unsigned long msecs = lisp_number_to_milliseconds (secs, 0);
+unsigned long msecs2 = (NILP (resignal) ? 0 :
+			  lisp_number_to_milliseconds (resignal, 0));
+int id;
+Lisp_Object lid;
+id = event_stream_generate_wakeup (msecs, msecs2, function, object, 0);
+lid = make_int (id);
+if (id != XINT (lid)) abort ();
+return lid;
+}
+DEFUN ("disable-timeout", Fdisable_timeout, Sdisable_timeout, 1, 1, 0 /*
+Disable a timeout from signalling any more.
+ID should be a timeout id number as returned by `add-timeout'.  If ID
+corresponds to a one-shot timeout that has already signalled, nothing
+will happen.
+It will not work to call this function on an id number returned by
+`add-async-timeout'.  Use `disable-async-timeout' for that.
+*/ )
+(id)
+Lisp_Object id;
+{
+CHECK_INT (id);
+event_stream_disable_wakeup (XINT (id), 0);
+return Qnil;
+}
+DEFUN ("add-async-timeout", Fadd_async_timeout, Sadd_async_timeout, 3, 4, 0 /*
+Add an asynchronous timeout, to be signaled after an interval has elapsed.
+SECS is a number of seconds, expressed as an integer or a float.
+FUNCTION will be called after that many seconds have elapsed, with one
+argument, the given OBJECT.  If the optional RESIGNAL argument is provided,
+then after this timeout expires, `add-async-timeout' will automatically be
+called again with RESIGNAL as the first argument.
+This function returns an object which is the id number of this particular
+timeout.  You can pass that object to `disable-async-timeout' to turn off
+the timeout before it has been signalled.
+NOTE: Id numbers as returned by this function are in a distinct namespace
+from those returned by `add-timeout'.  This means that the same id number
+could refer to a pending synchronous timeout and a different pending
+asynchronous timeout, and that you cannot pass an id from
+`add-async-timeout' to `disable-timeout', or vice-versa.
+The number of seconds may be expressed as a floating-point number, in which
+case some fractional part of a second will be used.  Caveat: the usable
+timeout granularity will vary from system to system.
+Adding an asynchronous timeout causes the function to be invoked as soon
+as the timeout occurs, even if XEmacs is in the midst of executing some
+other code. (This is unlike the synchronous timeouts added with
+`add-timeout', where the timeout will only be signalled when XEmacs is
+waiting for events, i.e. the next return to top-level or invocation of
+`sit-for' or related functions.) This means that the function that is
+called *must* not signal an error or change any global state (e.g. switch
+buffers or windows) except when locking code is in place to make sure
+that race conditions don't occur in the interaction between the
+asynchronous timeout function and other code.
+Under most circumstances, you should use `add-timeout' instead, as it is
+much safer.  Asynchronous timeouts should only be used when such behavior
+is really necessary.
+Asynchronous timeouts are blocked and will not occur when `inhibit-quit'
+is non-nil.  As soon as `inhibit-quit' becomes nil again, any pending
+asynchronous timeouts will get called immediately. (Multiple occurrences
+of the same asynchronous timeout are not queued, however.) While the
+callback function of an asynchronous timeout is invoked, `inhibit-quit'
+is automatically bound to non-nil, and thus other asynchronous timeouts
+will be blocked unless the callback function explicitly sets `inhibit-quit'
+to nil.
+WARNING: if you are thinking of calling `add-async-timeout' from inside of a
+callback function as a way of resignalling a timeout, think again.  There
+is a race condition.  That's why the RESIGNAL argument exists.
+*/ )
+(secs, function, object, resignal)
+Lisp_Object secs, function, object, resignal;
+{
+unsigned long msecs = lisp_number_to_milliseconds (secs, 0);
+unsigned long msecs2 = (NILP (resignal) ? 0 :
+			  lisp_number_to_milliseconds (resignal, 0));
+int id;
+Lisp_Object lid;
+id = event_stream_generate_wakeup (msecs, msecs2, function, object, 1);
+lid = make_int (id);
+if (id != XINT (lid)) abort ();
+return lid;
+}
+DEFUN ("disable-async-timeout", Fdisable_async_timeout,
+Sdisable_async_timeout, 1, 1, 0 /*
+Disable an asynchronous timeout from signalling any more.
+ID should be a timeout id number as returned by `add-async-timeout'.  If ID
+corresponds to a one-shot timeout that has already signalled, nothing
+will happen.
+It will not work to call this function on an id number returned by
+`add-timeout'.  Use `disable-timeout' for that.
+*/ )
+(id)
+Lisp_Object id;
+{
+CHECK_INT (id);
+event_stream_disable_wakeup (XINT (id), 1);
+return Qnil;
+}
+/**********************************************************************/
+/*                    enqueuing and dequeuing events                  */
+/**********************************************************************/
+/* Add an event to the back of the command-event queue: it will be the next
+event read after all pending events.   This only works on keyboard,
+mouse-click, misc-user, and eval events.
+*/
+void
+enqueue_command_event (Lisp_Object event)
+{
+enqueue_event (event, &command_event_queue, &command_event_queue_tail);
+}
+Lisp_Object
+dequeue_command_event (void)
+{
+return dequeue_event (&command_event_queue, &command_event_queue_tail);
+}
+/* put the event on the typeahead queue, unless
+the event is the quit char, in which case the `QUIT'
+which will occur on the next trip through this loop is
+all the processing we should do - leaving it on the queue
+would cause the quit to be processed twice.
+*/
+static void
+enqueue_command_event_1 (Lisp_Object event_to_copy)
+{
+/* do not call check_quit() here.  Vquit_flag was set in
+next_event_internal. */
+if (NILP (Vquit_flag))
+enqueue_command_event (Fcopy_event (event_to_copy, Qnil));
+}
+void
+enqueue_magic_eval_event (void (*fun) (Lisp_Object), Lisp_Object object)
+{
+Lisp_Object event;
+event = Fmake_event ();
+XEVENT (event)->event_type = magic_eval_event;
+/* channel for magic_eval events is nil */
+XEVENT (event)->event.magic_eval.internal_function = fun;
+XEVENT (event)->event.magic_eval.object = object;
+enqueue_command_event (event);
+}
+DEFUN ("enqueue-eval-event", Fenqueue_eval_event, Senqueue_eval_event,
+2, 2, 0 /*
+Add an eval event to the back of the eval event queue.
+When this event is dispatched, FUNCTION (which should be a function
+of one argument) will be called with OBJECT as its argument.
+See `next-event' for a description of event types and how events
+are received.
+*/ )
+(function, object)
+Lisp_Object function, object;
+{
+Lisp_Object event;
+event = Fmake_event ();
+XEVENT (event)->event_type = eval_event;
+/* channel for eval events is nil */
+XEVENT (event)->event.eval.function = function;
+XEVENT (event)->event.eval.object = object;
+enqueue_command_event (event);
+return event;
+}
+Lisp_Object
+enqueue_misc_user_event (Lisp_Object channel, Lisp_Object function,
+			 Lisp_Object object)
+{
+Lisp_Object event;
+event = Fmake_event ();
+XEVENT (event)->event_type = misc_user_event;
+XEVENT (event)->channel = channel;
+XEVENT (event)->event.eval.function = function;
+XEVENT (event)->event.eval.object = object;
+enqueue_command_event (event);
+return event;
+}
+/**********************************************************************/
+/*                       focus-event handling                         */
+/**********************************************************************/
+/*
+Ben's capsule lecture on focus:
+In FSFmacs `select-frame' never changes the window-manager frame
+focus.  All it does is change the "selected frame".  This is similar
+to what happens when we call `select-device' or `select-console'.
+Whenever an event comes in (including a keyboard event), its frame is
+selected; therefore, evaluating `select-frame' in *scratch* won't
+cause any effects because the next received event (in the same frame)
+will cause a switch back to the frame displaying *scratch*.
+Whenever a focus-change event is received from the window manager, it
+generates a `switch-frame' event, which causes the Lisp function
+`handle-switch-frame' to get run.  This basically just runs
+`select-frame' (see below, however).
+In FSFmacs, if you want to have an operation run when a frame is
+selected, you supply an event binding for `switch-frame' (and then
+maybe call `handle-switch-frame', or something ...).
+In XEmacs, we *do* change the window-manager frame focus as a result
+of `select-frame', but not until the next time an event is received,
+so that a function that momentarily changes the selected frame won't
+cause WM focus flashing. (#### There's something not quite right here;
+this is causing the wrong-cursor-focus problems that you occasionally
+see.  But the general idea is correct.) This approach is winning for
+people who use the explicit-focus model, but is trickier to implement.
+We also don't make the `switch-frame' event visible but instead have
+`select-frame-hook', which is a better approach.
+There is the problem of surrogate minibuffers, where when we enter the
+minibuffer, you essentially want to temporarily switch the WM focus to
+the frame with the minibuffer, and switch it back when you exit the
+minibuffer.
+FSFmacs solves this with the crockish `redirect-frame-focus', which
+says "for keyboard events received from FRAME, act like they're
+coming from FOCUS-FRAME".  I think what this means is that, when
+a keyboard event comes in and the event manager is about to select the
+event's frame, if that frame has its focus redirected, the redirected-to
+frame is selected instead.  That way, if you're in a minibufferless
+frame and enter the minibuffer, then all Lisp functions that run see
+the selected frame as the minibuffer's frame rather than the minibufferless
+frame you came from, so that (e.g.) your typing actually appears in
+the minibuffer's frame and things behave sanely.
+There's also some weird logic that switches the redirected frame focus
+from one frame to another if Lisp code explicitly calls `select-frame'
+\(but not if `handle-switch-frame' is called), and saves and restores
+the frame focus in window configurations, etc. etc.  All of this logic
+is heavily #if 0'd, with lots of comments saying "No, this approach
+doesn't seem to work, so I'm trying this ...  is it reasonable?
+Well, I'm not sure ..." that are a red flag indicating crockishness.
+Because of our way of doing things, we can avoid all this crock.
+Keyboard events never cause a select-frame (who cares what frame
+they're associated with?  They come from a console, only).  We change
+the actual WM focus to a surrogate minibuffer frame, so we don't have
+to do any internal redirection.  In order to get the focus back,
+I took the approach in minibuf.el of just checking to see if the
+frame we moved to is still the selected frame, and move back to the
+old one if so.  Conceivably we might have to do the weird "tracking"
+that FSFmacs does when `select-frame' is called, but I don't think
+so.  If the selected frame moved from the minibuffer frame, then
+we just leave it there, figuring that someone knows what they're
+doing.  Because we don't have any redirection recorded anywhere,
+it's safe to do this, and we don't end up with unwanted redirection.
+*/
+static void
+run_select_frame_hook (void)
+{
+run_hook (Qselect_frame_hook);
+}
+static void
+run_deselect_frame_hook (void)
+{
+#if 0 /* unclean!  FSF calls this at all sorts of random places,
+including a bunch of places in their mouse.el.  If this
+is implemented, it has to be done cleanly. */
+run_hook (Qmouse_leave_buffer_hook); /* #### Correct?  It's also
+					  called in `call-interactively'.
+					  Does this mean it will be
+					  called twice?  Oh well, FSF
+					  bug -- FSF calls it in
+					  `handle-switch-frame',
+					  which is approximately the
+					  same as the caller of this
+					  function. */
+#endif
+run_hook (Qdeselect_frame_hook);
+}
+/* When select-frame is called, we want to tell the window system that
+the focus should be changed to point to the new frame.  However,
+sometimes Lisp functions will temporarily change the selected frame
+(e.g. to call a function that operates on the selected frame),
+and it's annoying if this focus-change happens exactly when
+select-frame is called, because then you get some flickering of the
+window-manager border and perhaps other undesirable results.  We
+really only want to change the focus when we're about to retrieve
+an event from the user.  To do this, we keep track of the frame
+where the window-manager focus lies on, and just before waiting
+for user events, check the currently selected frame and change
+the focus as necessary. */
+static void
+investigate_frame_change (void)
+{
+Lisp_Object devcons, concons;
+/* if the selected frame was changed, change the window-system
+focus to the new frame.  We don't do it when select-frame was
+called, to avoid flickering and other unwanted side effects when
+the frame is just changed temporarily. */
+DEVICE_LOOP_NO_BREAK (devcons, concons)
+{
+struct device *d = XDEVICE (XCAR (devcons));
+Lisp_Object sel_frame = DEVICE_SELECTED_FRAME (d);
+/* You'd think that maybe we should use FRAME_WITH_FOCUS_REAL,
+	 but that can cause us to end up in an infinite loop focussing
+	 between two frames.  It seems that since the call to `select-frame'
+	 in emacs_handle_focus_change_final() is based on the _FOR_HOOKS
+	 value, we need to do so too. */
+if (!NILP (sel_frame) &&
+	  !EQ (DEVICE_FRAME_THAT_OUGHT_TO_HAVE_FOCUS (d), sel_frame) &&
+	  !NILP (DEVICE_FRAME_WITH_FOCUS_FOR_HOOKS (d)) &&
+	  !EQ (DEVICE_FRAME_WITH_FOCUS_FOR_HOOKS (d), sel_frame))
+	{
+	  /* prevent us from issuing the same request more than once */
+	  DEVICE_FRAME_THAT_OUGHT_TO_HAVE_FOCUS (d) = sel_frame;
+	  MAYBE_DEVMETH (d, focus_on_frame, (XFRAME (sel_frame)));
+	}
+}
+}
+static Lisp_Object
+cleanup_after_missed_defocusing (Lisp_Object frame)
+{
+if (FRAMEP (frame) && FRAME_LIVE_P (XFRAME (frame)))
+Fselect_frame (frame);
+return Qnil;
+}
+void
+emacs_handle_focus_change_preliminary (Lisp_Object frame_inp_and_dev)
+{
+Lisp_Object frame = Fcar (frame_inp_and_dev);
+Lisp_Object device = Fcar (Fcdr (frame_inp_and_dev));
+int in_p = !NILP (Fcdr (Fcdr (frame_inp_and_dev)));
+struct device *d;
+if (!DEVICE_LIVE_P (XDEVICE (device)))
+return;
+else
+d = XDEVICE (device);
+/* Any received focus-change notifications render invalid any
+pending focus-change requests. */
+DEVICE_FRAME_THAT_OUGHT_TO_HAVE_FOCUS (d) = Qnil;
+if (in_p)
+{
+Lisp_Object focus_frame;
+if (!FRAME_LIVE_P (XFRAME (frame)))
+	return;
+else
+	focus_frame = DEVICE_FRAME_WITH_FOCUS_REAL (d);
+/* Mark the minibuffer as changed to make sure it gets updated
+properly if the echo area is active. */
+MARK_WINDOWS_CHANGED (XWINDOW (FRAME_MINIBUF_WINDOW (XFRAME (frame))));
+if (FRAMEP (focus_frame) && !EQ (frame, focus_frame))
+	{
+	  /* Oops, we missed a focus-out event. */
+	  DEVICE_FRAME_WITH_FOCUS_REAL (d) = Qnil;
+	  redisplay_redraw_cursor (XFRAME (focus_frame), 1);
+	}
+DEVICE_FRAME_WITH_FOCUS_REAL (d) = frame;
+if (!EQ (frame, focus_frame))
+	{
+	  redisplay_redraw_cursor (XFRAME (frame), 1);
+	}
+}
+else
+{
+/* We ignore the frame reported in the event.  If it's different
+	 from where we think the focus was, oh well -- we messed up.
+	 Nonetheless, we pretend we were right, for sensible behavior. */
+frame = DEVICE_FRAME_WITH_FOCUS_REAL (d);
+if (!NILP (frame))
+	{
+	  DEVICE_FRAME_WITH_FOCUS_REAL (d) = Qnil;
+	  if (FRAME_LIVE_P (XFRAME (frame)))
+	    redisplay_redraw_cursor (XFRAME (frame), 1);
+	}
+}
+}
+/* Called from the window-system-specific code when we receive a
+notification that the focus lies on a particular frame.
+Argument is a cons: (frame . (device . in-p)) where in-p is non-nil
+for focus-in.
+*/
+void
+emacs_handle_focus_change_final (Lisp_Object frame_inp_and_dev)
+{
+Lisp_Object frame = Fcar (frame_inp_and_dev);
+Lisp_Object device = Fcar (Fcdr (frame_inp_and_dev));
+int in_p = !NILP (Fcdr (Fcdr (frame_inp_and_dev)));
+struct device *d;
+int count;
+if (!DEVICE_LIVE_P (XDEVICE (device)))
+return;
+else
+d = XDEVICE (device);
+if (in_p)
+{
+Lisp_Object focus_frame;
+if (!FRAME_LIVE_P (XFRAME (frame)))
+	return;
+else
+	focus_frame = DEVICE_FRAME_WITH_FOCUS_FOR_HOOKS (d);
+DEVICE_FRAME_WITH_FOCUS_FOR_HOOKS (d) = frame;
+if (FRAMEP (focus_frame) && !EQ (frame, focus_frame))
+	{
+	  /* Oops, we missed a focus-out event. */
+	  Fselect_frame (focus_frame);
+	  /* Do an unwind-protect in case an error occurs in
+	     the deselect-frame-hook */
+	  count = specpdl_depth ();
+	  record_unwind_protect (cleanup_after_missed_defocusing, frame);
+	  run_deselect_frame_hook ();
+	  unbind_to (count, Qnil);
+	  /* the cleanup method changed the focus frame to nil, so
+	     we need to reflect this */
+	  focus_frame = Qnil;
+	}
+else
+	Fselect_frame (frame);
+if (!EQ (frame, focus_frame))
+	run_select_frame_hook ();
+}
+else
+{
+/* We ignore the frame reported in the event.  If it's different
+	 from where we think the focus was, oh well -- we messed up.
+	 Nonetheless, we pretend we were right, for sensible behavior. */
+frame = DEVICE_FRAME_WITH_FOCUS_FOR_HOOKS (d);
+if (!NILP (frame))
+	{
+	  DEVICE_FRAME_WITH_FOCUS_FOR_HOOKS (d) = Qnil;
+	  run_deselect_frame_hook ();
+	}
+}
+}
+/**********************************************************************/
+/*                      retrieving the next event                     */
+/**********************************************************************/
+static int in_single_console;
+/* #### These functions don't currently do anything. */
+void
+single_console_state (void)
+{
+in_single_console = 1;
+}
+void
+any_console_state (void)
+{
+in_single_console = 0;
+}
+int
+in_single_console_state (void)
+{
+return in_single_console;
+}
+/* the number of keyboard characters read.  callint.c wants this.
+*/
+Charcount num_input_chars;
+static void
+next_event_internal (Lisp_Object target_event, int allow_queued)
+{
+struct gcpro gcpro1;
+/* QUIT;   This is incorrect - the caller must do this because some
+	     callers (ie, Fnext_event()) do not want to QUIT. */
+assert (NILP (XEVENT_NEXT (target_event)));
+GCPRO1 (target_event);
+investigate_frame_change ();
+if (allow_queued && !NILP (command_event_queue))
+{
+Lisp_Object event = dequeue_command_event ();
+Fcopy_event (event, target_event);
+Fdeallocate_event (event);
+#ifdef DEBUG_XEMACS
+if (debug_emacs_events)
+	{
+	  write_c_string ("(command event queue) ",
+			  Qexternal_debugging_output);
+	  print_internal (target_event, Qexternal_debugging_output, 1);
+	  write_c_string ("\n", Qexternal_debugging_output);
+	}
+#endif
+}
+else
+{
+struct Lisp_Event *e = XEVENT (target_event);
+/* The command_event_queue was empty.  Wait for an event. */
+event_stream_next_event (e);
+/* If this was a timeout, then we need to extract some data
+	 out of the returned closure and might need to resignal
+	 it. */
+if (e->event_type == timeout_event)
+	{
+	  Lisp_Object tristan, isolde;
+	  e->event.timeout.id_number =
+	    event_stream_resignal_wakeup (e->event.timeout.interval_id, 0,
+					  &tristan, &isolde);
+	  e->event.timeout.function = tristan;
+	  e->event.timeout.object = isolde;
+#ifdef DEBUG_XEMACS
+	  /* next_event_internal() doesn't print out timeout events
+	     because of the extra info we just set. */
+	  if (debug_emacs_events)
+	    {
+	      print_internal (target_event, Qexternal_debugging_output, 1);
+	      write_c_string ("\n", Qexternal_debugging_output);
+	    }
+#endif
+	}
+/* If we read a ^G, then set quit-flag but do not discard the ^G.
+	 The callers of next_event_internal() will do one of two things:
+	 -- set Vquit_flag to Qnil. (next-event does this.) This will
+	    cause the ^G to be treated as a normal keystroke.
+	 -- not change Vquit_flag but attempt to enqueue the ^G, at
+	    which point it will be discarded.  The next time QUIT is
+	    called, it will notice that Vquit_flag was set.
+*/
+if (e->event_type == key_press_event &&
+	  event_matches_key_specifier_p
+	  (e, make_char (CONSOLE_QUIT_CHAR (XCONSOLE (EVENT_CHANNEL (e))))))
+	{
+	  Vquit_flag = Qt;
+	}
+}
+UNGCPRO;
+}
+static void
+run_pre_idle_hook (void)
+{
+if (!NILP (Vpre_idle_hook)
+&& !detect_input_pending ())
+safe_run_hook_trapping_errors
+("Error in `pre-idle-hook' (setting hook to nil)",
+Qpre_idle_hook, 1);
+}
+static void push_this_command_keys (Lisp_Object event);
+static void push_recent_keys (Lisp_Object event);
+static void dribble_out_event (Lisp_Object event);
+static void execute_internal_event (Lisp_Object event);
+DEFUN ("next-event", Fnext_event, Snext_event, 0, 2, 0 /*
+Return the next available event.
+Pass this object to `dispatch-event' to handle it.
+In most cases, you will want to use `next-command-event', which returns
+the next available \"user\" event (i.e. keypress, button-press,
+button-release, or menu selection) instead of this function.
+If EVENT is non-nil, it should be an event object and will be filled in
+and returned; otherwise a new event object will be created and returned.
+If PROMPT is non-nil, it should be a string and will be displayed in the
+echo area while this function is waiting for an event.
+The next available event will be
+-- any events in `unread-command-events' or `unread-command-event'; else
+-- the next event in the currently executing keyboard macro, if any; else
+-- an event queued by `enqueue-eval-event', if any; else
+-- the next available event from the window system or terminal driver.
+In the last case, this function will block until an event is available.
+The returned event will be one of the following types:
+-- a key-press event.
+-- a button-press or button-release event.
+-- a misc-user-event, meaning the user selected an item on a menu or used
+the scrollbar.
+-- a process event, meaning that output from a subprocess is available.
+-- a timeout event, meaning that a timeout has elapsed.
+-- an eval event, which simply causes a function to be executed when the
+event is dispatched.  Eval events are generated by `enqueue-eval-event'
+or by certain other conditions happening.
+-- a magic event, indicating that some window-system-specific event
+happened (such as an focus-change notification) that must be handled
+synchronously with other events.  `dispatch-event' knows what to do with
+these events.
+*/ )
+(event, prompt)
+Lisp_Object event, prompt;
+{
+/* This function can GC */
+/* #### We start out using the selected console before an event
+is received, for echoing the partially completed command.
+This is most definitely wrong -- there needs to be a separate
+echo area for each console! */
+struct console *con = XCONSOLE (Vselected_console);
+struct command_builder *command_builder =
+XCOMMAND_BUILDER (con->command_builder);
+int store_this_key = 0;
+struct gcpro gcpro1;
+GCPRO1 (event);
+/* DO NOT do QUIT anywhere within this function or the functions it calls.
+We want to read the ^G as an event. */
+if (NILP (event))
+event = Fmake_event ();
+else
+CHECK_LIVE_EVENT (event);
+if (!NILP (prompt))
+{
+Bytecount len;
+CHECK_STRING (prompt);
+len = string_length (XSTRING (prompt));
+if (command_builder->echo_buf_length < len)
+	len = command_builder->echo_buf_length - 1;
+memcpy (command_builder->echo_buf, string_data (XSTRING (prompt)), len);
+command_builder->echo_buf[len] = 0;
+command_builder->echo_buf_index = len;
+echo_area_message (XFRAME (CONSOLE_SELECTED_FRAME (con)),
+			 command_builder->echo_buf,
+			 Qnil, 0,
+			 command_builder->echo_buf_index,
+			 Qcommand);
+}
+start_over_and_avoid_hosage:
+/* If there is something in unread-command-events, simply return it.
+But do some error checking to make sure the user hasn't put something
+in the unread-command-events that they shouldn't have.
+This does not update this-command-keys and recent-keys.
+*/
+if (!NILP (Vunread_command_events))
+{
+if (!CONSP (Vunread_command_events))
+	{
+	  Vunread_command_events = Qnil;
+	  signal_error (Qwrong_type_argument,
+			list3 (Qconsp, Vunread_command_events,
+			       Qunread_command_events));
+	}
+else
+	{
+	  Lisp_Object e = XCAR (Vunread_command_events);
+	  Vunread_command_events = XCDR (Vunread_command_events);
+	  if (!EVENTP (e) || !command_event_p (e))
+	    signal_error (Qwrong_type_argument,
+			  list3 (Qcommand_event_p, e, Qunread_command_events));
+	  redisplay ();
+	  if (!EQ (e, event))
+	    Fcopy_event (e, event);
+#ifdef DEBUG_XEMACS
+	  if (debug_emacs_events)
+	    {
+	      write_c_string ("(unread-command-events) ",
+			      Qexternal_debugging_output);
+	      print_internal (event, Qexternal_debugging_output, 1);
+	      write_c_string ("\n", Qexternal_debugging_output);
+	    }
+#endif
+	}
+}
+/* Do similar for unread-command-event (obsoleteness support).
+*/
+else if (!NILP (Vunread_command_event))
+{
+Lisp_Object e = Vunread_command_event;
+Vunread_command_event = Qnil;
+if (!EVENTP (e) || !command_event_p (e))
+	{
+	  signal_error (Qwrong_type_argument,
+			list3 (Qeventp, e, Qunread_command_event));
+	}
+if (!EQ (e, event))
+	Fcopy_event (e, event);
+redisplay ();
+#ifdef DEBUG_XEMACS
+if (debug_emacs_events)
+	{
+	  write_c_string ("(unread-command-event) ",
+			  Qexternal_debugging_output);
+	  print_internal (event, Qexternal_debugging_output, 1);
+	  write_c_string ("\n", Qexternal_debugging_output);
+	}
+#endif
+}
+/* If we're executing a keyboard macro, take the next event from that,
+and update this-command-keys and recent-keys.
+Note that the unread-command-events take precedence over kbd macros.
+*/
+else
+{
+if (!NILP (Vexecuting_macro))
+	{
+	  redisplay ();
+	  pop_kbd_macro_event (event);  /* This throws past us at
+					   end-of-macro. */
+	  store_this_key = 1;
+#ifdef DEBUG_XEMACS
+	  if (debug_emacs_events)
+	    {
+	      write_c_string ("(keyboard macro) ",
+			      Qexternal_debugging_output);
+	      print_internal (event, Qexternal_debugging_output, 1);
+	      write_c_string ("\n", Qexternal_debugging_output);
+	    }
+#endif
+	}
+/* Otherwise, read a real event, possibly from the
+	 command_event_queue, and update this-command-keys and
+	 recent-keys. */
+else
+	{
+	  run_pre_idle_hook ();
+	  redisplay ();
+	  next_event_internal (event, 1);
+	  Vquit_flag = Qnil; /* Read C-g as an event. */
+	  store_this_key = 1;
+	}
+}
+status_notify ();             /* Notice process change */
+#ifdef C_ALLOCA
+alloca (0);		/* Cause a garbage collection now */
+/* Since we can free the most stuff here
+*  (since this is typically called from
+*  the command-loop top-level). */
+#endif /* C_ALLOCA */
+if (object_dead_p (XEVENT (event)->channel))
+/* event_console_or_selected may crash if the channel is dead.
+Best just to eat it and get the next event. */
+goto start_over_and_avoid_hosage;
+/* OK, now we can stop the selected-console kludge and use the
+actual console from the event. */
+con = event_console_or_selected (event);
+command_builder = XCOMMAND_BUILDER (con->command_builder);
+switch (XEVENT_TYPE (event))
+{
+default:
+goto RETURN;
+case button_release_event:
+case misc_user_event:
+goto EXECUTE_KEY;
+case button_press_event:	/* key or mouse input can trigger prompting */
+goto STORE_AND_EXECUTE_KEY;
+case key_press_event:         /* any key input can trigger autosave */
+break;
+}
+maybe_do_auto_save ();
+num_input_chars++;
+STORE_AND_EXECUTE_KEY:
+if (store_this_key)
+{
+echo_key_event (command_builder, event);
+}
+EXECUTE_KEY:
+/* Store the last-input-event.  The semantics of this is that it is
+the thing most recently returned by next-command-event.  It need
+not have come from the keyboard or a keyboard macro, it may have
+come from unread-command-events.  It's always a command-event (a
+key, click, or menu selection), never a motion or process event.
+*/
+if (!EVENTP (Vlast_input_event))
+Vlast_input_event = Fmake_event ();
+if (XEVENT_TYPE (Vlast_input_event) == dead_event)
+{
+Vlast_input_event = Fmake_event ();
+error ("Someone deallocated last-input-event!");
+}
+if (! EQ (event, Vlast_input_event))
+Fcopy_event (event, Vlast_input_event);
+/* last-input-char and last-input-time are derived from
+last-input-event.
+Note that last-input-char will never have its high-bit set, in an
+effort to sidestep the ambiguity between M-x and oslash.
+*/
+Vlast_input_char = Fevent_to_character (Vlast_input_event,
+Qnil, Qnil, Qnil);
+{
+EMACS_TIME t;
+EMACS_GET_TIME (t);
+if (!CONSP (Vlast_input_time))
+Vlast_input_time = Fcons (Qnil, Qnil);
+XCAR (Vlast_input_time)
+= make_int ((EMACS_SECS (t) >> 16) & 0xffff);
+XCDR (Vlast_input_time)
+= make_int ((EMACS_SECS (t) >> 0)  & 0xffff);
+}
+/* If this key came from the keyboard or from a keyboard macro, then
+it goes into the recent-keys and this-command-keys vectors.
+If this key came from the keyboard, and we're defining a keyboard
+macro, then it goes into the macro.
+*/
+if (store_this_key)
+{
+push_this_command_keys (event);
+push_recent_keys (event);
+dribble_out_event (event);
+if (!NILP (con->defining_kbd_macro) && NILP (Vexecuting_macro))
+	{
+	  if (!EVENTP (command_builder->current_events))
+	    finalize_kbd_macro_chars (con);
+	  store_kbd_macro_event (event);
+	}
+}
+/* If this is the help char and there is a help form, then execute the
+help form and swallow this character.  This is the only place where
+calling Fnext_event() can cause arbitrary lisp code to run.  Note
+that execute_help_form() calls Fnext_command_event(), which calls
+this function, as well as Fdispatch_event.
+*/
+if (!NILP (Vhelp_form) &&
+event_matches_key_specifier_p (XEVENT (event), Vhelp_char))
+execute_help_form (command_builder, event);
+RETURN:
+UNGCPRO;
+return (event);
+}
+DEFUN ("next-command-event", Fnext_command_event, Snext_command_event,
+0, 2, 0 /*
+Return the next available \"user\" event.
+Pass this object to `dispatch-event' to handle it.
+If EVENT is non-nil, it should be an event object and will be filled in
+and returned; otherwise a new event object will be created and returned.
+If PROMPT is non-nil, it should be a string and will be displayed in the
+echo area while this function is waiting for an event.
+The event returned will be a keyboard, mouse press, or mouse release event.
+If there are non-command events available (mouse motion, sub-process output,
+etc) then these will be executed (with `dispatch-event') and discarded.  This
+function is provided as a convenience; it is equivalent to the lisp code
+	(while (progn
+		 (next-event event prompt)
+	         (not (or (key-press-event-p event)
+	                  (button-press-event-p event)
+	                  (button-release-event-p event)
+	                  (misc-user-event-p event))))
+	   (dispatch-event event))
+*/ )
+(event, prompt)
+Lisp_Object event, prompt;
+{
+/* This function can GC */
+struct gcpro gcpro1;
+GCPRO1 (event);
+maybe_echo_keys (XCOMMAND_BUILDER
+		   (XCONSOLE (Vselected_console)->
+		    command_builder), 0); /* #### This sucks bigtime */
+for (;;)
+{
+event = Fnext_event (event, prompt);
+if (command_event_p (event))
+break;
+else
+execute_internal_event (event);
+}
+UNGCPRO;
+return (event);
+}
+static void
+reset_current_events (struct command_builder *command_builder)
+{
+Lisp_Object event = command_builder->current_events;
+reset_command_builder_event_chain (command_builder);
+if (EVENTP (event))
+deallocate_event_chain (event);
+}
+DEFUN ("discard-input", Fdiscard_input, Sdiscard_input, 0, 0, 0 /*
+Discard any pending \"user\" events.
+Also cancel any kbd macro being defined.
+A user event is a key press, button press, button release, or
+\"other-user\" event (menu selection or scrollbar action).
+*/ )
+()
+{
+/* This throws away user-input on the queue, but doesn't process any
+events.  Calling dispatch_event() here leads to a race condition.
+*/
+Lisp_Object event = Fmake_event ();
+Lisp_Object head = Qnil, tail = Qnil;
+Lisp_Object oiq = Vinhibit_quit;
+struct gcpro gcpro1, gcpro2;
+/* #### not correct here with Vselected_console?  Should
+discard-input take a console argument, or maybe map over
+all consoles? */
+struct console *con = XCONSOLE (Vselected_console);
+/* next_event_internal() can cause arbitrary Lisp code to be evalled */
+GCPRO2 (event, oiq);
+Vinhibit_quit = Qt;
+/* If a macro was being defined then we have to mark the modeline
+has changed to ensure that it gets updated correctly. */
+if (!NILP (con->defining_kbd_macro))
+MARK_MODELINE_CHANGED;
+con->defining_kbd_macro = Qnil;
+reset_current_events (XCOMMAND_BUILDER (con->command_builder));
+while (!NILP (command_event_queue)
+|| event_stream_event_pending_p (1))
+{
+/* This will take stuff off the command_event_queue, or read it
+	 from the event_stream, but it will not block.
+*/
+next_event_internal (event, 1);
+Vquit_flag = Qnil; /* Treat C-g as a user event (ignore it).
+			    It is vitally important that we reset
+			    Vquit_flag here.  Otherwise, if we're
+			    reading from a TTY console,
+			    maybe_read_quit_event() will notice
+			    that C-g has been set and send us
+			    another C-g.  That will cause us
+			    to get right back here, and read
+			    another C-g, ad infinitum ... */
+/* If the event is a user event, ignore it. */
+if (!command_event_p (event))
+	{
+	  /* Otherwise, chain the event onto our list of events not to ignore,
+	     and keep reading until the queue is empty.  This does not mean
+	     that if a subprocess is generating an infinite amount of output,
+	     we will never terminate (*provided* that the behavior of
+	     next_event_cb() is correct -- see the comment in events.h),
+	     because this loop ends as soon as there are no more user events
+	     on the command_event_queue or event_stream.
+	     */
+	  enqueue_event (Fcopy_event (event, Qnil), &head, &tail);
+	}
+}
+if (!NILP (command_event_queue) || !NILP (command_event_queue_tail))
+abort ();
+/* Now tack our chain of events back on to the front of the queue.
+Actually, since the queue is now drained, we can just replace it.
+The effect of this will be that we have deleted all user events
+from the input stream without changing the relative ordering of
+any other events.  (Some events may have been taken from the
+event_stream and added to the command_event_queue, however.)
+At this time, the command_event_queue will contain only eval_events.
+*/
+command_event_queue = head;
+command_event_queue_tail = tail;
+Fdeallocate_event (event);
+UNGCPRO;
+Vinhibit_quit = oiq;
+return Qnil;
+}
+/**********************************************************************/
+/*                     pausing until an action occurs                 */
+/**********************************************************************/
+/* #### Is (accept-process-output nil 3) supposed to be like (sleep-for 3)?
+*/
+DEFUN ("accept-process-output", Faccept_process_output, Saccept_process_output,
+0, 3, 0 /*
+Allow any pending output from subprocesses to be read by Emacs.
+It is read into the process' buffers or given to their filter functions.
+Non-nil arg PROCESS means do not return until some output has been received
+from PROCESS.
+If the second arg is non-nil, it is the maximum number of seconds to wait:
+this function will return after that much time even if no input has arrived
+from PROCESS.  This argument may be a float, meaning wait some fractional
+part of a second.
+If the third arg is non-nil, it is a number of milliseconds that is added
+to the second arg.  (This exists only for compatibility.)
+Return non-nil iff we received any output before the timeout expired.
+*/ )
+(process, timeout_secs, timeout_msecs)
+Lisp_Object process, timeout_secs, timeout_msecs;
+{
+/* This function can GC */
+struct gcpro gcpro1, gcpro2;
+Lisp_Object event  = Qnil;
+Lisp_Object result = Qnil;
+int timeout_id;
+int timeout_enabled = 0;
+struct buffer *old_buffer = current_buffer;
+/* We preserve the current buffer but nothing else.  If a focus
+change alters the selected window then the top level event loop
+will eventually alter current_buffer to match.  In the mean time
+we don't want to mess up whatever called this function. */
+if (!NILP (process))
+CHECK_PROCESS (process);
+GCPRO2 (event, process);
+if (!NILP (process) && (!NILP (timeout_secs) || !NILP (timeout_msecs)))
+{
+unsigned long msecs = 0;
+if (!NILP (timeout_secs))
+	msecs = lisp_number_to_milliseconds (timeout_secs, 1);
+if (!NILP (timeout_msecs))
+	{
+	  CHECK_NATNUM (timeout_msecs);
+	  msecs += XINT (timeout_msecs);
+	}
+if (msecs)
+{
+timeout_id = event_stream_generate_wakeup (msecs, 0, Qnil, Qnil, 0);
+timeout_enabled = 1;
+}
+}
+event = Fmake_event ();
+while (!NILP (process)
+	 /* Calling detect_input_pending() is the wrong thing here, because
+	    that considers the Vunread_command_events and command_event_queue.
+	    We don't need to look at the command_event_queue because we are
+	    only interested in process events, which don't go on that.  In
+	    fact, we can't read from it anyway, because we put stuff on it.
+	    Note that event_stream->event_pending_p must be called in such
+	    a way that it says whether any events *of any kind* are ready,
+	    not just user events, or (accept-process-output nil) will fail
+	    to dispatch any process events that may be on the queue.  It is
+	    not clear to me that this is important, because the top-level
+	    loop will process it, and I don't think that there is ever a
+	    time when one calls accept-process-output with a nil argument
+	    and really need the processes to be handled. */
+	 || (!EQ (result, Qt) && event_stream_event_pending_p (0)))
+{
+QUIT;	/* next_event_internal() does not QUIT, so check for ^G
+		   before reading output from the process - this makes it
+		   less likely that the filter will actually be aborted.
+		 */
+next_event_internal (event, 0);
+/* If C-g was pressed while we were waiting, Vquit_flag got
+	 set and next_event_internal() also returns C-g.  When
+	 we enqueue the C-g below, it will get discarded.  The
+	 next time through, QUIT will be called and will signal a quit. */
+switch (XEVENT_TYPE (event))
+	{
+	case process_event:
+	  {
+	    if (EQ (XEVENT (event)->event.process.process, process))
+	      {
+		process = Qnil;
+		/* RMS's version always returns nil when proc is nil,
+		   and only returns t if input ever arrived on proc. */
+		result = Qt;
+	      }
+	    execute_internal_event (event);
+	    break;
+	  }
+	case timeout_event:
+	  {
+	    if (timeout_enabled &&
+XEVENT (event)->event.timeout.id_number == timeout_id)
+	      {
+timeout_enabled = 0;
+		process = Qnil; /* we're done */
+	      }
+	    else	/* a timeout that's not the one we're waiting for */
+goto EXECUTE_INTERNAL;
+	    break;
+	  }
+	case pointer_motion_event:
+	case magic_event:
+{
+EXECUTE_INTERNAL:
+execute_internal_event (event);
+break;
+}
+	default:
+{
+enqueue_command_event_1 (event);
+break;
+	  }
+	}
+}
+/* If our timeout has not been signalled yet, disable it. */
+if (timeout_enabled)
+event_stream_disable_wakeup (timeout_id, 0);
+Fdeallocate_event (event);
+UNGCPRO;
+current_buffer = old_buffer;
+return result;
+}
+DEFUN ("sleep-for", Fsleep_for, Ssleep_for, 1, 1, 0 /*
+Pause, without updating display, for ARG seconds.
+ARG may be a float, meaning pause for some fractional part of a second.
+*/ )
+(seconds)
+Lisp_Object seconds;
+{
+/* This function can GC */
+unsigned long msecs = lisp_number_to_milliseconds (seconds, 1);
+int id;
+Lisp_Object event = Qnil;
+struct gcpro gcpro1;
+GCPRO1 (event);
+id = event_stream_generate_wakeup (msecs, 0, Qnil, Qnil, 0);
+event = Fmake_event ();
+while (1)
+{
+QUIT;	/* next_event_internal() does not QUIT, so check for ^G
+		   before reading output from the process - this makes it
+		   less likely that the filter will actually be aborted.
+		 */
+/* We're a generator of the command_event_queue, so we can't be a
+	 consumer as well.  We don't care about command and eval-events
+	 anyway.
+*/
+next_event_internal (event, 0); /* blocks */
+/* See the comment in accept-process-output about Vquit_flag */
+switch (XEVENT_TYPE (event))
+	{
+	case timeout_event:
+	  {
+	    if (XEVENT (event)->event.timeout.id_number == id)
+	      goto DONE_LABEL;
+else
+goto EXECUTE_INTERNAL;
+	  }
+	case pointer_motion_event:
+	case process_event:
+	case magic_event:
+{
+EXECUTE_INTERNAL:
+execute_internal_event (event);
+break;
+}
+	default:
+	  {
+	    enqueue_command_event_1 (event);
+break;
+}
+	}
+}
+DONE_LABEL:
+Fdeallocate_event (event);
+UNGCPRO;
+return Qnil;
+}
+DEFUN ("sit-for", Fsit_for, Ssit_for, 1, 2, 0 /*
+Perform redisplay, then wait ARG seconds or until user input is available.
+ARG may be a float, meaning a fractional part of a second.
+Optional second arg non-nil means don't redisplay, just wait for input.
+Redisplay is preempted as always if user input arrives, and does not
+happen if input is available before it starts.
+Value is t if waited the full time with no input arriving.
+*/ )
+(seconds, nodisplay)
+Lisp_Object seconds, nodisplay;
+{
+/* This function can GC */
+unsigned long msecs = lisp_number_to_milliseconds (seconds, 1);
+Lisp_Object event, result;
+struct gcpro gcpro1;
+int id;
+/* The unread-command-events count as pending input */
+if (!NILP (Vunread_command_events) || !NILP (Vunread_command_event))
+return Qnil;
+/* If the command-builder already has user-input on it (not eval events)
+then that means we're done too.
+*/
+if (!NILP (command_event_queue))
+{
+EVENT_CHAIN_LOOP (event, command_event_queue)
+	{
+	  if (command_event_p (event))
+	    return (Qnil);
+	}
+}
+/* If we're in a macro, or noninteractive, or early in temacs, then
+don't wait. */
+if (noninteractive || !NILP (Vexecuting_macro))
+return (Qnil);
+/* Otherwise, start reading events from the event_stream.
+Do this loop at least once even if (sit-for 0) so that we
+redisplay when no input pending.
+*/
+event = Fmake_event ();
+GCPRO1 (event);
+/* Generate the wakeup even if MSECS is 0, so that existing timeout/etc.
+events get processed.  The old (pre-19.12) code special-cased this
+and didn't generate a wakeup, but the resulting behavior was less than
+ideal; viz. the occurrence of (sit-for 0.001) scattered throughout
+the E-Lisp universe. */
+id = event_stream_generate_wakeup (msecs, 0, Qnil, Qnil, 0);
+while (1)
+{
+/* If there is no user input pending, then redisplay.
+*/
+if (!event_stream_event_pending_p (1) && NILP (nodisplay))
+	{
+	  run_pre_idle_hook ();
+	  redisplay ();
+	}
+/* If we're no longer waiting for a timeout, bug out. */
+if (! id)
+	{
+	  result = Qt;
+	  goto DONE_LABEL;
+	}
+QUIT;	/* next_event_internal() does not QUIT, so check for ^G
+		   before reading output from the process - this makes it
+		   less likely that the filter will actually be aborted.
+		 */
+/* We're a generator of the command_event_queue, so we can't be a
+	 consumer as well.  In fact, we know there's nothing on the
+	 command_event_queue that we didn't just put there.
+*/
+next_event_internal (event, 0); /* blocks */
+/* See the comment in accept-process-output about Vquit_flag */
+if (command_event_p (event))
+	{
+	  result = Qnil;
+	  goto DONE_LABEL;
+	}
+switch (XEVENT_TYPE (event))
+	{
+	case eval_event:
+	  {
+	    /* eval-events get delayed until later. */
+	    enqueue_command_event (Fcopy_event (event, Qnil));
+	    break;
+	  }
+	case timeout_event:
+	  {
+	    if (XEVENT (event)->event.timeout.id_number != id)
+	      /* a timeout that wasn't the one we're waiting for */
+	      goto EXECUTE_INTERNAL;
+	    id = 0;	/* assert that we are no longer waiting for it. */
+	    result = Qt;
+	    goto DONE_LABEL;
+	  }
+default:
+	  {
+	  EXECUTE_INTERNAL:
+	    execute_internal_event (event);
+	    break;
+	  }
+	}
+}
+DONE_LABEL:
+/* If our timeout has not been signalled yet, disable it. */
+if (id)
+event_stream_disable_wakeup (id, 0);
+/* Put back the event (if any) that made Fsit_for() exit before the
+timeout.  Note that it is being added to the back of the queue, which
+would be inappropriate if there were any user events on the queue
+already: we would be misordering them.  But we know that there are
+no user-events on the queue, or else we would not have reached this
+point at all.
+*/
+if (NILP (result))
+enqueue_command_event (event);
+else
+Fdeallocate_event (event);
+UNGCPRO;
+return (result);
+}
+/* This handy little function is used by xselect.c and energize.c to
+wait for replies from processes that aren't really processes (that is,
+the X server and the Energize server).
+*/
+void
+wait_delaying_user_input (int (*predicate) (void *arg), void *predicate_arg)
+{
+/* This function can GC */
+Lisp_Object event = Fmake_event ();
+struct gcpro gcpro1;
+GCPRO1 (event);
+while (!(*predicate) (predicate_arg))
+{
+QUIT; /* next_event_internal() does not QUIT. */
+/* We're a generator of the command_event_queue, so we can't be a
+	 consumer as well.  Also, we have no reason to consult the
+	 command_event_queue; there are only user and eval-events there,
+	 and we'd just have to put them back anyway.
+*/
+next_event_internal (event, 0);
+/* See the comment in accept-process-output about Vquit_flag */
+if (command_event_p (event)
+|| (XEVENT_TYPE (event) == eval_event)
+	  || (XEVENT_TYPE (event) == magic_eval_event))
+enqueue_command_event_1 (event);
+else
+execute_internal_event (event);
+}
+UNGCPRO;
+}
+/**********************************************************************/
+/*                dispatching events; command builder                 */
+/**********************************************************************/
+static void
+execute_internal_event (Lisp_Object event)
+{
+/* events on dead channels get silently eaten */
+if (object_dead_p (XEVENT (event)->channel))
+return;
+/* This function can GC */
+switch (XEVENT_TYPE (event))
+{
+case empty_event:
+return;
+case eval_event:
+{
+	call1 (XEVENT (event)->event.eval.function,
+	       XEVENT (event)->event.eval.object);
+	return;
+}
+case magic_eval_event:
+{
+	(XEVENT (event)->event.magic_eval.internal_function)
+	  (XEVENT (event)->event.magic_eval.object);
+	return;
+}
+case pointer_motion_event:
+{
+	if (!NILP (Vmouse_motion_handler))
+	  call1 (Vmouse_motion_handler, event);
+	return;
+}
+case process_event:
+{
+	Lisp_Object p = XEVENT (event)->event.process.process;
+	Charcount readstatus;
+	assert  (PROCESSP (p));
+	while ((readstatus = read_process_output (p)) > 0)
+	  ;
+	if (readstatus > 0)
+	  ; /* this clauses never gets executed but allows the #ifdefs
+	       to work cleanly. */
+#ifdef EWOULDBLOCK
+	else if (readstatus == -1 && errno == EWOULDBLOCK)
+	  ;
+#endif /* EWOULDBLOCK */
+#ifdef EAGAIN
+	else if (readstatus == -1 && errno == EAGAIN)
+	  ;
+#endif /* EAGAIN */
+	else if ((readstatus == 0 &&
+		  /* Note that we cannot distinguish between no input
+		     available now and a closed pipe.
+		     With luck, a closed pipe will be accompanied by
+		     subprocess termination and SIGCHLD.  */
+		  (!network_connection_p (p) ||
+		   /*
+		      When connected to ToolTalk (i.e.
+		      connected_via_filedesc_p()), it's not possible to
+		      reliably determine whether there is a message
+		      waiting for ToolTalk to receive.  ToolTalk expects
+		      to have tt_message_receive() called exactly once
+		      every time the file descriptor becomes active, so
+		      the filter function forces this by returning 0.
+		      Emacs must not interpret this as a closed pipe. */
+		   connected_via_filedesc_p (XPROCESS (p))))
+#ifdef HAVE_PTYS
+		 /* On some OSs with ptys, when the process on one end of
+		    a pty exits, the other end gets an error reading with
+		    errno = EIO instead of getting an EOF (0 bytes read).
+		    Therefore, if we get an error reading and errno =
+		    EIO, just continue, because the child process has
+		    exited and should clean itself up soon (e.g. when we
+		    get a SIGCHLD). */
+		 || (readstatus == -1 && errno == EIO)
+#endif
+		 )
+	  {
+	    /* Currently, we rely on SIGCHLD to indicate that
+	       the process has terminated.  Unfortunately, it
+	       appears that on some systems the SIGCHLD gets
+	       missed some of the time.  So, we put in am
+	       additional check in status_notify() to see
+	       whether a process has terminated.  We have to
+	       tell status_notify() to enable that check, and
+	       we do so now. */
+	    kick_status_notify ();
+	  }
+	else
+	  {
+	    /* Deactivate network connection */
+	    Lisp_Object status = Fprocess_status (p);
+	    if (EQ (status, Qopen)
+		/* In case somebody changes the theory of whether to
+		   return open as opposed to run for network connection
+		   "processes"... */
+		|| EQ (status, Qrun))
+	      update_process_status (p, Qexit, 256, 0);
+	    deactivate_process (p);
+	  }
+	/* We must call status_notify here to allow the
+	   event_stream->unselect_process_cb to be run if appropriate.
+	   Otherwise, dead fds may be selected for, and we will get a
+	   continuous stream of process events for them.  Since we don't
+	   return until all process events have been flushed, we would
+	   get stuck here, processing events on a process whose status
+	   was 'exit.  Call this after dispatch-event, or the fds will
+	   have been closed before we read the last data from them.
+	   It's safe for the filter to signal an error because
+	   status_notify() will be called on return to top-level.
+	   */
+	status_notify ();
+	return;
+}
+case timeout_event:
+{
+	struct Lisp_Event *e = XEVENT (event);
+	if (!NILP (e->event.timeout.function))
+	  call1 (e->event.timeout.function,
+		 e->event.timeout.object);
+	return;
+}
+case magic_event:
+{
+	event_stream_handle_magic_event (XEVENT (event));
+	return;
+}
+default:
+abort ();
+}
+}
+static void
+this_command_keys_replace_suffix (Lisp_Object suffix, Lisp_Object chain)
+{
+Lisp_Object first_before_suffix =
+event_chain_find_previous (Vthis_command_keys, suffix);
+if (NILP (first_before_suffix))
+Vthis_command_keys = chain;
+else
+XSET_EVENT_NEXT (first_before_suffix, chain);
+deallocate_event_chain (suffix);
+Vthis_command_keys_tail = event_chain_tail (chain);
+}
+static void
+command_builder_replace_suffix (struct command_builder *builder,
+				Lisp_Object suffix, Lisp_Object chain)
+{
+Lisp_Object first_before_suffix =
+event_chain_find_previous (builder->current_events, suffix);
+if (NILP (first_before_suffix))
+builder->current_events = chain;
+else
+XSET_EVENT_NEXT (first_before_suffix, chain);
+deallocate_event_chain (suffix);
+builder->most_current_event = event_chain_tail (chain);
+}
+static Lisp_Object
+command_builder_find_leaf_1 (struct command_builder *builder)
+{
+Lisp_Object event0 = builder->current_events;
+if (NILP (event0))
+return (Qnil);
+return event_binding (event0, 1);
+}
+/* See if we can do function-key-map or key-translation-map translation
+on the current events in the command builder.  If so, do this, and
+return the resulting binding, if any. */
+static Lisp_Object
+munge_keymap_translate (struct command_builder *builder,
+			enum munge_me_out_the_door munge,
+			int has_normal_binding_p)
+{
+Lisp_Object suffix;
+EVENT_CHAIN_LOOP (suffix, builder->munge_me[munge].first_mungeable_event)
+{
+Lisp_Object result = munging_key_map_event_binding (suffix, munge);
+if (!NILP (result))
+	{
+	  if (KEYMAPP (result))
+	    {
+	      if (NILP (builder->last_non_munged_event)
+		  && !has_normal_binding_p)
+		builder->last_non_munged_event =
+		  builder->most_current_event;
+	    }
+	  else
+	    builder->last_non_munged_event = Qnil;
+	  if (!KEYMAPP (result) && !VECTORP (result)
+	      && !STRINGP (result))
+	  {
+	    struct gcpro gcpro1;
+	    GCPRO1 (suffix);
+	    result = call1 (result, Qnil);
+	    UNGCPRO;
+	  }
+	  if (KEYMAPP (result))
+	    return result;
+	  if (VECTORP (result) || STRINGP (result))
+	    {
+	      Lisp_Object new_chain =
+		key_sequence_to_event_chain (result);
+	      Lisp_Object tempev;
+	      int n, tckn;
+	      /* If the first_mungeable_event of the other munger
+		 is within the events we're munging, then it will
+		 point to deallocated events afterwards, which is
+		 bad -- so make it point at the beginning of the
+		 munged events. */
+	      EVENT_CHAIN_LOOP (tempev, suffix)
+		{
+		  if (EQ (tempev, builder->munge_me[1 - munge].
+			  first_mungeable_event))
+		    {
+		      builder->munge_me[1 - munge].first_mungeable_event =
+			new_chain;
+		      break;
+		    }
+		}
+	      n = event_chain_count (suffix);
+	      command_builder_replace_suffix (builder, suffix, new_chain);
+	      builder->munge_me[munge].first_mungeable_event = Qnil;
+	      /* Now hork this-command-keys as well. */
+	      /* We just assume that the events we just replaced
+		 are sitting in copied form at the end of this-command-keys.
+		 If the user did weird things with `dispatch-event'
+		 this may not be the case, but at least we make
+		 sure we won't crash. */
+	      new_chain = copy_event_chain (new_chain);
+	      tckn = event_chain_count (Vthis_command_keys);
+	      if (tckn >= n)
+		{
+		  this_command_keys_replace_suffix
+		    (event_chain_nth (Vthis_command_keys, tckn - n),
+		     new_chain);
+		}
+	      result = command_builder_find_leaf_1 (builder);
+	      return result;
+	    }
+	  if (munge == MUNGE_ME_FUNCTION_KEY)
+	    signal_simple_error ("Invalid binding in function-key-map",
+				 result);
+	  else
+	    signal_simple_error ("Invalid binding in key-translation-map",
+				 result);
+	}
+}
+return Qnil;
+}
+/* Compare the current state of the command builder against the local and
+global keymaps, and return the binding.  If there is no match, try again,
+case-insensitively.  The return value will be
+-- nil (there is no binding)
+-- a keymap (part of a command has been specified)
+-- a command (anything that satisfies `commandp'; this includes
+some symbols, lists, subrs, strings, vectors, and
+		    compiled-function objects)
+*/
+static Lisp_Object
+command_builder_find_leaf (struct command_builder *builder,
+int allow_misc_user_events_p)
+{
+/* This function can GC */
+Lisp_Object result;
+Lisp_Object evee = builder->current_events;
+if (allow_misc_user_events_p
+&& (NILP (XEVENT_NEXT (evee)))
+&& (XEVENT_TYPE (evee) == misc_user_event))
+{
+Lisp_Object fn = XEVENT (evee)->event.eval.function;
+Lisp_Object arg = XEVENT (evee)->event.eval.object;
+return (list2 (fn, arg));
+}
+else if (XEVENT_TYPE (evee) == misc_user_event)
+return Qnil;
+result = command_builder_find_leaf_1 (builder);
+/* Check to see if we have a potential function-key-map match. */
+if (NILP (result))
+{
+result = munge_keymap_translate (builder, MUNGE_ME_FUNCTION_KEY, 0);
+regenerate_echo_keys_from_this_command_keys (builder);
+}
+/* Check to see if we have a potential key-translation-map match. */
+{
+Lisp_Object key_translate_result =
+munge_keymap_translate (builder, MUNGE_ME_KEY_TRANSLATION,
+			      !NILP (result));
+if (!NILP (key_translate_result))
+{
+	result = key_translate_result;
+	regenerate_echo_keys_from_this_command_keys (builder);
+}
+}
+if (!NILP (result))
+return result;
+/* If key-sequence wasn't bound, we'll try some fallbacks.  */
+{
+Lisp_Object terminal = builder->most_current_event;
+/* If we didn't find a binding, and the last event in the sequence is
+a shifted character, then try again with the lowercase version.  */
+if (!NILP (Vretry_undefined_key_binding_unshifted)
+	&& XEVENT_TYPE (terminal) == key_press_event
+	&& ((XEVENT (terminal)->event.key.modifiers & MOD_SHIFT)
+	    || (CHAR_OR_CHAR_INTP (XEVENT (terminal)->event.key.keysym)
+		&& XCHAR_OR_CHAR_INT (XEVENT (terminal)->event.key.keysym)
+		>= 'A'
+		&& XCHAR_OR_CHAR_INT (XEVENT (terminal)->event.key.keysym)
+		<= 'Z')))
+{
+	struct Lisp_Event terminal_copy;
+	terminal_copy = *XEVENT (terminal);
+	if (XEVENT (terminal)->event.key.modifiers & MOD_SHIFT)
+	  XEVENT (terminal)->event.key.modifiers &= (~ MOD_SHIFT);
+	else
+	  XEVENT (terminal)->event.key.keysym
+= make_char (XCHAR_OR_CHAR_INT (XEVENT (terminal)->
+					    event.key.keysym)
+			 + 'a' - 'A');
+	result = command_builder_find_leaf (builder, allow_misc_user_events_p);
+	if (!NILP (result))
+	  return (result);
+	/* If there was no match with the lower-case version either, then
+	   put back the upper-case event for the error message.
+	   But make sure that function-key-map didn't change things out
+	   from under us. */
+	if (EQ (terminal, builder->most_current_event))
+	  *XEVENT (terminal) = terminal_copy;
+}
+}
+if (!NILP (Vprefix_help_command) &&
+event_matches_key_specifier_p (XEVENT (builder->most_current_event),
+				     Vhelp_char))
+return (Vprefix_help_command);
+/* If we read extra events attempting to match a function key but end
+up failing, then we release those events back to the command loop
+and fail on the original lookup.  The released events will then be
+reprocessed in the context of the first part having failed. */
+if (!NILP (builder->last_non_munged_event))
+{
+Lisp_Object event0 = builder->last_non_munged_event;
+/* Put the commands back on the event queue. */
+enqueue_event_chain (XEVENT_NEXT (event0),
+			   &command_event_queue,
+			   &command_event_queue_tail);
+/* Then remove them from the command builder. */
+XSET_EVENT_NEXT (event0, Qnil);
+builder->most_current_event = event0;
+builder->last_non_munged_event = Qnil;
+}
+return Qnil;
+}
+/* Every time a command-event (a key, button, or menu selection) is read by
+Fnext_event(), it is stored in the recent_keys_ring, in Vlast_input_event,
+and in Vthis_command_keys.  (Eval-events are not stored there.)
+Every time a command is invoked, Vlast_command_event is set to the last
+event in the sequence.
+This means that Vthis_command_keys is really about "input read since the
+last command was executed" rather than about "what keys invoked this
+command."  This is a little counterintuitive, but that's the way it
+has always worked.
+As an extra kink, the function read-key-sequence resets/updates the
+last-command-event and this-command-keys.  It doesn't append to the
+command-keys as read-char does.  Such are the pitfalls of having to
+maintain compatibility with a program for which the only specification
+is the code itself.
+(We could implement recent_keys_ring and Vthis_command_keys as the same
+data structure.)
+*/
+#define RECENT_KEYS_SIZE 100
+Lisp_Object recent_keys_ring;
+int recent_keys_ring_index;
+DEFUN ("recent-keys", Frecent_keys, Srecent_keys, 0, 0, 0 /*
+Return vector of last 100 or so keyboard or mouse button events read.
+This copies the event objects into a new vector; it is safe to keep and
+modify them.
+*/ )
+()
+{
+struct gcpro gcpro1;
+Lisp_Object val = Qnil;
+int size = XVECTOR (recent_keys_ring)->size;
+int start, nkeys, i, j;
+GCPRO1 (val);
+if (NILP (vector_data (XVECTOR (recent_keys_ring))[recent_keys_ring_index]))
+/* This means the vector has not yet wrapped */
+{
+nkeys = recent_keys_ring_index;
+start = 0;
+}
+else
+{
+nkeys = size;
+start = ((recent_keys_ring_index == size) ? 0 : recent_keys_ring_index);
+}
+val = make_vector (nkeys, Qnil);
+for (i = 0, j = start; i < nkeys; i++)
+{
+Lisp_Object e = vector_data (XVECTOR (recent_keys_ring))[j];
+if (NILP (e))
+abort ();
+vector_data (XVECTOR (val))[i] = Fcopy_event (e, Qnil);
+if (++j >= size)
+j = 0;
+}
+UNGCPRO;
+return (val);
+}
+/* Vthis_command_keys having value Qnil means that the next time
+push_this_command_keys is called, it should start over.
+The times at which the the command-keys are reset
+(instead of merely being augmented) are pretty conterintuitive.
+(More specifically:
+-- We do not reset this-command-keys when we finish reading a
+command.  This is because some commands (e.g. C-u) act
+like command prefixes; they signal this by setting prefix-arg
+to non-nil.
+-- Therefore, we reset this-command-keys when we finish
+executing a comand, unless prefix-arg is set.
+-- However, if we ever do a non-local exit out of a command
+loop (e.g. an error in a command), we need to reset
+this-command-keys.  We do this by calling reset_this_command_keys()
+from cmdloop.c, whenever an error causes an invocation of the
+default error handler, and whenever there's a throw to top-level.)
+*/
+void
+reset_this_command_keys (Lisp_Object console, int clear_echo_area_p)
+{
+struct command_builder *command_builder =
+XCOMMAND_BUILDER (XCONSOLE (console)->command_builder);
+reset_key_echo (command_builder, clear_echo_area_p);
+deallocate_event_chain (Vthis_command_keys);
+Vthis_command_keys = Qnil;
+Vthis_command_keys_tail = Qnil;
+reset_current_events (command_builder);
+}
+static void
+push_this_command_keys (Lisp_Object event)
+{
+Lisp_Object new = Fmake_event ();
+Fcopy_event (event, new);
+enqueue_event (new, &Vthis_command_keys, &Vthis_command_keys_tail);
+}
+/* The following two functions are used in call-interactively,
+for the @ and e specifications.  We used to just use
+`current-mouse-event' (i.e. the last mouse event in this-comand-keys),
+but FSF does it more generally so we follow their lead. */
+Lisp_Object
+extract_this_command_keys_nth_mouse_event (int n)
+{
+Lisp_Object event;
+EVENT_CHAIN_LOOP (event, Vthis_command_keys)
+{
+if (EVENTP (event)
+	  && (XEVENT_TYPE (event) == button_press_event
+	      || XEVENT_TYPE (event) == button_release_event
+	      || XEVENT_TYPE (event) == misc_user_event))
+	{
+	  if (!n)
+	    {
+	      /* must copy to avoid an abort() in next_event_internal() */
+	      if (!NILP (XEVENT_NEXT (event)))
+return Fcopy_event (event, Qnil);
+	      else
+	        return event;
+	    }
+	  n--;
+	}
+}
+return Qnil;
+}
+Lisp_Object
+extract_vector_nth_mouse_event (Lisp_Object vector, int n)
+{
+int i;
+for (i = 0; i < vector_length (XVECTOR (vector)); i++)
+{
+Lisp_Object event = vector_data (XVECTOR (vector))[i];
+if (EVENTP (event)
+	  && (XEVENT_TYPE (event) == button_press_event
+	      || XEVENT_TYPE (event) == button_release_event
+	      || XEVENT_TYPE (event) == misc_user_event))
+	{
+	  if (!n)
+	    return event;
+	  n--;
+	}
+}
+return Qnil;
+}
+static void
+push_recent_keys (Lisp_Object event)
+{
+Lisp_Object e
+= vector_data (XVECTOR (recent_keys_ring)) [recent_keys_ring_index];
+if (NILP (e))
+{
+e = Fmake_event ();
+vector_data (XVECTOR (recent_keys_ring)) [recent_keys_ring_index] = e;
+}
+Fcopy_event (event, e);
+if (++recent_keys_ring_index == XVECTOR (recent_keys_ring)->size)
+recent_keys_ring_index = 0;
+}
+static Lisp_Object
+current_events_into_vector (struct command_builder *command_builder)
+{
+Lisp_Object vector;
+Lisp_Object event;
+int n = event_chain_count (command_builder->current_events);
+/* Copy the vector and the events in it. */
+/*  No need to copy the events, since they're already copies, and
+nobody other than the command-builder has pointers to them */
+vector = make_vector (n, Qnil);
+n = 0;
+EVENT_CHAIN_LOOP (event, command_builder->current_events)
+vector_data (XVECTOR (vector))[n++] = event;
+reset_command_builder_event_chain (command_builder);
+return (vector);
+}
+/*
+Given the current state of the command builder and a new command event
+that has just been dispatched:
+-- add the event to the event chain forming the current command
+(doing meta-translation as necessary)
+-- return the binding of the this event chain; this will be one of
+-- nil (there is no binding)
+-- a keymap (part of a command has been specified)
+-- a command (anything that satisfies `commandp'; this includes
+some symbols, lists, subrs, strings, vectors, and
+		    compiled-function objects)
+*/
+static Lisp_Object
+lookup_command_event (struct command_builder *command_builder,
+Lisp_Object event, int allow_misc_user_events_p)
+{
+/* This function can GC */
+struct frame *f = selected_frame ();
+/* Clear output from previous command execution */
+if (!EQ (Qcommand, echo_area_status (f))
+/* but don't let mouse-up clear what mouse-down just printed */
+&& (XEVENT (event)->event_type != button_release_event))
+clear_echo_area (f, Qnil, 0);
+/* Add the given event to the command builder.
+Extra hack: this also updates the recent_keys_ring and Vthis_command_keys
+vectors to translate "ESC x" to "M-x" (for any "x" of course).
+*/
+{
+Lisp_Object recent = command_builder->most_current_event;
+if (EVENTP (recent)
+	&& event_matches_key_specifier_p (XEVENT (recent), Vmeta_prefix_char))
+{
+	struct Lisp_Event *e;
+	/* When we see a sequence like "ESC x", pretend we really saw "M-x".
+	   DoubleThink the recent-keys and this-command-keys as well. */
+	/* Modify the previous most-recently-pushed event on the command
+	   builder to be a copy of this one with the meta-bit set instead of
+	   pushing a new event.
+	   */
+	Fcopy_event (event, recent);
+	e = XEVENT (recent);
+	if (e->event_type == key_press_event)
+	  e->event.key.modifiers |= MOD_META;
+	else if (e->event_type == button_press_event
+		 || e->event_type == button_release_event)
+	  e->event.button.modifiers |= MOD_META;
+	else
+	  abort ();
+	{
+	  int tckn = event_chain_count (Vthis_command_keys);
+	  if (tckn >= 2)
+	    /* ??? very strange if it's < 2. */
+	    this_command_keys_replace_suffix
+	      (event_chain_nth (Vthis_command_keys, tckn - 2),
+	       Fcopy_event (recent, Qnil));
+	}
+	regenerate_echo_keys_from_this_command_keys (command_builder);
+}
+else
+{
+	event = Fcopy_event (event, Fmake_event ());
+	command_builder_append_event (command_builder, event);
+}
+}
+{
+Lisp_Object leaf = command_builder_find_leaf (command_builder,
+allow_misc_user_events_p);
+struct gcpro gcpro1;
+GCPRO1 (leaf);
+if (KEYMAPP (leaf))
+{
+	Lisp_Object prompt = Fkeymap_prompt (leaf, Qt);
+	if (STRINGP (prompt))
+	  {
+	    /* Append keymap prompt to key echo buffer */
+	    int buf_index = command_builder->echo_buf_index;
+	    Bytecount len = string_length (XSTRING (prompt));
+	    if (len + buf_index + 1 <= command_builder->echo_buf_length)
+	      {
+		Bufbyte *echo = command_builder->echo_buf + buf_index;
+		memcpy (echo, string_data (XSTRING (prompt)), len);
+		echo[len] = 0;
+	      }
+	    maybe_echo_keys (command_builder, 1);
+	  }
+	else
+	  maybe_echo_keys (command_builder, 0);
+}
+else if (!NILP (leaf))
+{
+	if (EQ (Qcommand, echo_area_status (f))
+	    && command_builder->echo_buf_index > 0)
+	  {
+	    /* If we had been echoing keys, echo the last one (without
+	       the trailing dash) and redisplay before executing the
+	       command. */
+	    command_builder->echo_buf[command_builder->echo_buf_index] = 0;
+	    maybe_echo_keys (command_builder, 1);
+	    Fsit_for (Qzero, Qt);
+	  }
+}
+RETURN_UNGCPRO (leaf);
+}
+}
+static void
+execute_command_event (struct command_builder *command_builder,
+Lisp_Object event)
+{
+/* This function can GC */
+struct console *con = XCONSOLE (command_builder->console);
+struct gcpro gcpro1;
+GCPRO1 (event); /* event may be freshly created */
+reset_current_events (command_builder);
+if (XEVENT (event)->event_type == key_press_event)
+Vcurrent_mouse_event = Qnil;
+else if (XEVENT (event)->event_type == button_press_event
+	   || XEVENT (event)->event_type == button_release_event
+	   || XEVENT (event)->event_type == misc_user_event)
+Vcurrent_mouse_event = Fcopy_event (event, Qnil);
+/* Store the last-command-event.  The semantics of this is that it is
+the last event most recently involved in command-lookup.
+*/
+if (!EVENTP (Vlast_command_event))
+Vlast_command_event = Fmake_event ();
+if (XEVENT (Vlast_command_event)->event_type == dead_event)
+{
+Vlast_command_event = Fmake_event ();
+error ("Someone deallocated the last-command-event!");
+}
+if (! EQ (event, Vlast_command_event))
+Fcopy_event (event, Vlast_command_event);
+/* Note that last-command-char will never have its high-bit set, in
+an effort to sidestep the ambiguity between M-x and oslash.
+*/
+Vlast_command_char = Fevent_to_character (Vlast_command_event,
+					    Qnil, Qnil, Qnil);
+/* Actually call the command, with all sorts of hair to preserve or clear
+the echo-area and region as appropriate and call the pre- and post-
+command-hooks.
+*/
+{
+int old_kbd_macro = con->kbd_macro_end;
+struct window *w;
+w = XWINDOW (Fselected_window (Qnil));
+/* We're executing a new command, so the old value of is irrelevant. */
+zmacs_region_stays = 0;
+/* If the previous command tried to force a specific window-start,
+reset the flag in case this command moves point far away from
+that position.  Also, reset the window's buffer's change
+information so that we don't trigger an incremental update. */
+if (w->force_start)
+{
+	w->force_start = 0;
+	buffer_reset_changes (XBUFFER (w->buffer));
+}
+pre_command_hook ();
+if (XEVENT (event)->event_type == misc_user_event)
+{
+	call1 (XEVENT (event)->event.eval.function,
+	       XEVENT (event)->event.eval.object);
+}
+else
+{
+#if 0
+	call3 (Qcommand_execute, Vthis_command, Qnil, Qnil);
+#else
+	Fcommand_execute (Vthis_command, Qnil, Qnil);
+#endif
+}
+post_command_hook ();
+if (!NILP (con->prefix_arg))
+{
+	/* Commands that set the prefix arg don't update last-command, don't
+	   reset the echoing state, and don't go into keyboard macros unless
+	   followed by another command.
+	   */
+	maybe_echo_keys (command_builder, 0);
+	/* If we're recording a keyboard macro, and the last command
+	   executed set a prefix argument, then decrement the pointer to
+	   the "last character really in the macro" to be just before this
+	   command.  This is so that the ^U in "^U ^X )" doesn't go onto
+	   the end of macro.
+	   */
+	if (!NILP (con->defining_kbd_macro))
+	  con->kbd_macro_end = old_kbd_macro;
+}
+else
+{
+	/* Start a new command next time */
+	Vlast_command = Vthis_command;
+	/* Emacs 18 doesn't unconditionally clear the echoed keystrokes,
+	   so we don't either */
+	reset_this_command_keys (make_console (con), 0);
+}
+}
+UNGCPRO;
+}
+/* Run the pre command hook. */
+static void
+pre_command_hook (void)
+{
+last_point_position = BUF_PT (current_buffer);
+XSETBUFFER (last_point_position_buffer, current_buffer);
+/* This function can GC */
+safe_run_hook_trapping_errors
+("Error in `pre-command-hook' (setting hook to nil)",
+Qpre_command_hook, 1);
+}
+/* Run the post command hook. */
+static void
+post_command_hook (void)
+{
+/* This function can GC */
+/* Turn off region highlighting unless this command requested that
+it be left on, or we're in the minibuffer.  We don't turn it off
+when we're in the minibuffer so that things like M-x write-region
+still work!
+This could be done via a function on the post-command-hook, but
+we don't want the user to accidentally remove it.
+*/
+if (! zmacs_region_stays
+&& (!MINI_WINDOW_P (XWINDOW (Fselected_window (Qnil)))
+	  /* but don't leave the region around if it's in the
+	     minibuffer. */
+	  || EQ (zmacs_region_buffer (),
+		 WINDOW_BUFFER (XWINDOW (Fselected_window (Qnil))))))
+zmacs_deactivate_region ();
+else
+zmacs_update_region ();
+safe_run_hook_trapping_errors
+("Error in `post-command-hook' (setting hook to nil)",
+Qpost_command_hook, 1);
+#ifdef DEFERRED_ACTION_CRAP
+if (!NILP (Vdeferred_action_list))
+call0 (Vdeferred_action_function);
+#endif
+#ifdef ILL_CONCEIVED_HOOK
+if (NILP (Vunread_command_events)
+&& NILP (Vexecuting_macro)
+&& !NILP (Vpost_command_idle_hook)
+&& !NILP (Fsit_for (make_float ((double) post_command_idle_delay
+				      / 1000000), Qnil)))
+safe_run_hook_trapping_errors
+("Error in `post-command-idle-hook' (setting hook to nil)",
+Qpost_command_idle_hook, 1);
+#endif
+#if 0 /* FSFmacs */
+if (!NILP (current_buffer->mark_active))
+{
+if (!NILP (Vdeactivate_mark) && !NILP (Vtransient_mark_mode))
+{
+current_buffer->mark_active = Qnil;
+	  run_hook (intern ("deactivate-mark-hook"));
+}
+else if (current_buffer != prev_buffer ||
+	       BUF_MODIFF (current_buffer) != prev_modiff)
+	run_hook (intern ("activate-mark-hook"));
+}
+#endif /* FSFmacs */
+/* #### Kludge!!! This is necessary to make sure that things
+are properly positioned even if post-command-hook moves point.
+#### There should be a cleaner way of handling this. */
+call0 (Qauto_show_make_point_visible);
+}
+DEFUN ("dispatch-event", Fdispatch_event, Sdispatch_event, 1, 1, 0 /*
+Given an event object as returned by `next-event', execute it.
+Key-press, button-press, and button-release events get accumulated
+until a complete key sequence (see `read-key-sequence') is reached,
+at which point the sequence is looked up in the current keymaps and
+acted upon.
+Mouse motion events cause the low-level handling function stored in
+`mouse-motion-handler' to be called. (There are very few circumstances
+under which you should change this handler.  Use `mode-motion-hook'
+instead.)
+Menu, timeout, and eval events cause the associated function or handler
+to be called.
+Process events cause the subprocess's output to be read and acted upon
+appropriately (see `start-process').
+Magic events are handled as necessary.
+*/ )
+(event)
+Lisp_Object event;
+{
+/* This function can GC */
+struct command_builder *command_builder;
+struct Lisp_Event *ev;
+Lisp_Object console;
+Lisp_Object channel;
+CHECK_LIVE_EVENT (event);
+ev = XEVENT (event);
+/* events on dead channels get silently eaten */
+channel = EVENT_CHANNEL (ev);
+if (object_dead_p (channel))
+return Qnil;
+/* Some events don't have channels (e.g. eval events). */
+console = CDFW_CONSOLE (channel);
+if (NILP (console))
+console = Vselected_console;
+else if (!EQ (console, Vselected_console))
+Fselect_console (console);
+command_builder = XCOMMAND_BUILDER (XCONSOLE (console)->command_builder);
+switch (XEVENT (event)->event_type)
+{
+case button_press_event:
+case button_release_event:
+case key_press_event:
+{
+	Lisp_Object leaf;
+	leaf = lookup_command_event (command_builder, event, 1);
+	if (KEYMAPP (leaf))
+	  /* Incomplete key sequence */
+	  break;
+	if (NILP (leaf))
+	  {
+	    /* At this point, we know that the sequence is not bound to a
+	       command.  Normally, we beep and print a message informing the
+	       user of this.  But we do not beep or print a message when:
+	       o  the last event in this sequence is a mouse-up event; or
+	       o  the last event in this sequence is a mouse-down event and
+	       there is a binding for the mouse-up version.
+	       That is, if the sequence ``C-x button1'' is typed, and is not
+	       bound to a command, but the sequence ``C-x button1up'' is bound
+	       to a command, we do not complain about the ``C-x button1''
+	       sequence.  If neither ``C-x button1'' nor ``C-x button1up'' is
+	       bound to a command, then we complain about the ``C-x button1''
+	       sequence, but later will *not* complain about the
+	       ``C-x button1up'' sequence, which would be redundant.
+	       This is pretty hairy, but I think it's the most intuitive
+	       behavior.
+	       */
+	    Lisp_Object terminal = command_builder->most_current_event;
+	    if (XEVENT_TYPE (terminal) == button_press_event)
+	      {
+		int no_bitching;
+		/* Temporarily pretend the last event was an "up" instead of a
+		   "down", and look up its binding. */
+		XEVENT_TYPE (terminal) = button_release_event;
+		/* If the "up" version is bound, don't complain. */
+		no_bitching
+		  = !NILP (command_builder_find_leaf
+			   (command_builder, 0));
+		/* Undo the temporary changes we just made. */
+		XEVENT_TYPE (terminal) = button_press_event;
+		if (no_bitching)
+		  {
+		    /* Pretend this press was not seen (treat as a prefix) */
+		    if (EQ (command_builder->current_events, terminal))
+		      {
+			reset_current_events (command_builder);
+		      }
+		    else
+		      {
+			Lisp_Object eve;
+			EVENT_CHAIN_LOOP (eve, command_builder->current_events)
+			  if (EQ (XEVENT_NEXT (eve), terminal))
+			    break;
+			Fdeallocate_event (command_builder->
+					   most_current_event);
+			XSET_EVENT_NEXT (eve, Qnil);
+			command_builder->most_current_event = eve;
+		      }
+		    maybe_echo_keys (command_builder, 1);
+		    break;
+		  }
+	      }
+	    /* Complain that the typed sequence is not defined, if this is the
+	       kind of sequence that warrants a complaint.
+	       */
+	    XCONSOLE (console)->defining_kbd_macro = Qnil;
+	    XCONSOLE (console)->prefix_arg = Qnil;
+	    /* Don't complain about undefined button-release events */
+	    if (XEVENT_TYPE (terminal) != button_release_event)
+	      {
+		Lisp_Object keys =
+		  current_events_into_vector (command_builder);
+		struct gcpro gcpro1;
+		/* Run the pre-command-hook before barfing about an undefined
+		   key. */
+		Vthis_command = Qnil;
+		GCPRO1 (keys);
+		pre_command_hook ();
+		UNGCPRO;
+		/* The post-command-hook doesn't run. */
+		Fsignal (Qundefined_keystroke_sequence, list1 (keys));
+	      }
+	    /* Reset the command builder for reading the next sequence. */
+	    reset_this_command_keys (console, 1);
+	  }
+	else
+	  {
+	    Vthis_command = leaf;
+	    /* Don't push an undo boundary if the command set the prefix arg,
+	       or if we are executing a keyboard macro, or if in the
+	       minibuffer.  If the command we are about to execute is
+	       self-insert, it's tricky: up to 20 consecutive self-inserts may
+	       be done without an undo boundary.  This counter is reset as
+	       soon as a command other than self-insert-command is executed.
+	       */
+	    if (! EQ (leaf, Qself_insert_command))
+	      command_builder->self_insert_countdown = 0;
+	    if (NILP (XCONSOLE (console)->prefix_arg)
+		&& NILP (Vexecuting_macro)
+#if 0
+		/* This was done in the days when there was no undo
+		   in the minibuffer.  If we don't disable this code,
+		   then each instance of "undo" undoes everything in
+		   the minibuffer. */
+		&& !EQ (minibuf_window, Fselected_window (Qnil))
+#endif
+		&& command_builder->self_insert_countdown == 0)
+	      Fundo_boundary ();
+	    if (EQ (leaf, Qself_insert_command))
+	      {
+		if (--command_builder->self_insert_countdown < 0)
+		  command_builder->self_insert_countdown = 20;
+	      }
+	    execute_command_event (command_builder,
+				   !NILP (Fequal (event,
+						  command_builder->
+						  most_current_event))
+				   ? event
+				   /* Use the translated event that
+				      was most recently seen.  This way,
+				      last-command-event becomes f1
+				      instead of the P from ESC O P.
+				      But must copy it, else we'll lose
+				      when the command-builder events
+				      are deallocated. */
+				   : Fcopy_event (command_builder->
+						  most_current_event, Qnil));
+	  }
+	break;
+}
+case misc_user_event:
+{
+	/* Jamie said:
+	   We could just always use the menu item entry, whatever it is, but
+	   this might break some Lisp code that expects `this-command' to
+	   always contain a symbol.  So only store it if this is a simple
+	   `call-interactively' sort of menu item.
+	   But this is bogus.  `this-command' could be a string or vector
+	   anyway (for keyboard macros).  There's even one instance
+	   (in pending-del.el) of `this-command' getting set to a cons
+	   (a lambda expression).  So in the `eval' case I'll just
+	   convert it into a lambda expression.
+	   */
+	if (EQ (XEVENT (event)->event.eval.function, Qcall_interactively)
+	    && SYMBOLP (XEVENT (event)->event.eval.object))
+	  Vthis_command = XEVENT (event)->event.eval.object;
+	else if (EQ (XEVENT (event)->event.eval.function, Qeval))
+	  Vthis_command =
+	    Fcons (Qlambda, Fcons (Qnil, XEVENT (event)->event.eval.object));
+	else if (SYMBOLP (XEVENT (event)->event.eval.function))
+	  /* A scrollbar command or the like. */
+	  Vthis_command = XEVENT (event)->event.eval.function;
+	else
+	  /* Huh? */
+	  Vthis_command = Qnil;
+	command_builder->self_insert_countdown = 0;
+	if (NILP (XCONSOLE (console)->prefix_arg)
+	    && NILP (Vexecuting_macro)
+	    && !EQ (minibuf_window, Fselected_window (Qnil)))
+	  Fundo_boundary ();
+	execute_command_event (command_builder, event);
+	break;
+}
+default:
+{
+	execute_internal_event (event);
+	break;
+}
+}
+return (Qnil);
+}
+DEFUN ("read-key-sequence", Fread_key_sequence, Sread_key_sequence, 1, 3, 0 /*
+Read a sequence of keystrokes or mouse clicks.
+Returns a vector of the event objects read.  The vector and the event
+objects it contains are freshly created (and will not be side-effected
+by subsequent calls to this function).
+The sequence read is sufficient to specify a non-prefix command starting
+from the current local and global keymaps.  A C-g typed while in this
+function is treated like any other character, and `quit-flag' is not set.
+First arg PROMPT is a prompt string.  If nil, do not prompt specially.
+Second (optional) arg CONTINUE-ECHO, if non-nil, means this key echos
+as a continuation of the previous key.
+The third (optional) arg DONT-DOWNCASE-LAST, if non-nil, means do not
+convert the last event to lower case.  (Normally any upper case event
+is converted to lower case if the original event is undefined and the lower
+case equivalent is defined.) This argument is provided mostly for
+FSF compatibility; the equivalent effect can be achieved more generally
+by binding `retry-undefined-key-binding-unshifted' to nil around the
+call to `read-key-sequence'.
+A C-g typed while in this function is treated like any other character,
+and `quit-flag' is not set.
+If the user selects a menu item while we are prompting for a key-sequence,
+the returned value will be a vector of a single menu-selection event.
+An error will be signalled if you pass this value to `lookup-key' or a
+related function.
+`read-key-sequence' checks `function-key-map' for function key
+sequences, where they wouldn't conflict with ordinary bindings.  See
+`function-key-map' for more details.
+*/ )
+(prompt, continue_echo, dont_downcase_last)
+Lisp_Object prompt, continue_echo, dont_downcase_last;
+{
+/* This function can GC */
+struct console *con = XCONSOLE (Vselected_console); /* #### correct?
+							 Probably not -- see
+							 comment in
+							 next-event */
+struct command_builder *command_builder =
+XCOMMAND_BUILDER (con->command_builder);
+Lisp_Object result;
+Lisp_Object event = Fmake_event ();
+int speccount = specpdl_depth ();
+struct gcpro gcpro1;
+GCPRO1 (event);
+if (!NILP (prompt))
+CHECK_STRING (prompt);
+/* else prompt = Fkeymap_prompt (current_buffer->keymap); may GC */
+QUIT;
+if (NILP (continue_echo))
+reset_this_command_keys (make_console (con), 1);
+specbind (Qinhibit_quit, Qt);
+if (!NILP (dont_downcase_last))
+specbind (Qretry_undefined_key_binding_unshifted, Qnil);
+for (;;)
+{
+Fnext_event (event, prompt);
+/* restore the selected-console damage */
+con = event_console_or_selected (event);
+command_builder = XCOMMAND_BUILDER (con->command_builder);
+if (! command_event_p (event))
+	execute_internal_event (event);
+else
+	{
+	  if (XEVENT (event)->event_type == misc_user_event)
+	    reset_current_events (command_builder);
+	  result = lookup_command_event (command_builder, event, 1);
+	  if (!KEYMAPP (result))
+	    {
+	      result = current_events_into_vector (command_builder);
+	      reset_key_echo (command_builder, 0);
+	      break;
+	    }
+	  prompt = Qnil;
+	}
+}
+Vquit_flag = Qnil;  /* In case we read a ^G; do not call check_quit() here */
+Fdeallocate_event (event);
+RETURN_UNGCPRO (unbind_to (speccount, result));
+}
+DEFUN ("this-command-keys", Fthis_command_keys, Sthis_command_keys, 0, 0, 0 /*
+Return a vector of the keyboard or mouse button events that were used
+to invoke this command.  This copies the vector and the events; it is safe
+to keep and modify them.
+*/ )
+()
+{
+Lisp_Object event;
+Lisp_Object result;
+int len;
+if (NILP (Vthis_command_keys))
+return (make_vector (0, Qnil));
+len = event_chain_count (Vthis_command_keys);
+result = make_vector (len, Qnil);
+len = 0;
+EVENT_CHAIN_LOOP (event, Vthis_command_keys)
+vector_data (XVECTOR (result))[len++] = Fcopy_event (event, Qnil);
+return (result);
+}
+DEFUN ("reset-this-command-lengths", Freset_this_command_lengths,
+Sreset_this_command_lengths, 0, 0, 0 /*
+Used for complicated reasons in `universal-argument-other-key'.
+`universal-argument-other-key' rereads the event just typed.
+It then gets translated through `function-key-map'.
+The translated event gets included in the echo area and in
+the value of `this-command-keys' in addition to the raw original event.
+That is not right.
+Calling this function directs the translated event to replace
+the original event, so that only one version of the event actually
+appears in the echo area and in the value of `this-command-keys.'.
+*/ )
+()
+{
+/* #### I don't understand this at all, so currently it does nothing.
+If there is ever a problem, maybe someone should investigate. */
+return Qnil;
+}
+static void
+dribble_out_event (Lisp_Object event)
+{
+if (NILP (Vdribble_file))
+return;
+if (XEVENT (event)->event_type == key_press_event &&
+!XEVENT (event)->event.key.modifiers)
+{
+Lisp_Object keysym = XEVENT (event)->event.key.keysym;
+if (CHARP (XEVENT (event)->event.key.keysym))
+	{
+	  Emchar ch = XCHAR (keysym);
+	  Bufbyte str[MAX_EMCHAR_LEN];
+	  Bytecount len;
+	  len = set_charptr_emchar (str, ch);
+	  Lstream_write (XLSTREAM (Vdribble_file), str, len);
+	}
+else if (string_char_length (XSYMBOL (keysym)->name) == 1)
+	/* one-char key events are printed with just the key name */
+	Fprinc (keysym, Vdribble_file);
+else if (EQ (keysym, Qreturn))
+	Lstream_putc (XLSTREAM (Vdribble_file), '\n');
+else if (EQ (keysym, Qspace))
+	Lstream_putc (XLSTREAM (Vdribble_file), ' ');
+else
+	Fprinc (event, Vdribble_file);
+}
+else
+Fprinc (event, Vdribble_file);
+Lstream_flush (XLSTREAM (Vdribble_file));
+}
+DEFUN ("open-dribble-file", Fopen_dribble_file, Sopen_dribble_file, 1, 1,
+"FOpen dribble file: " /*
+Start writing all keyboard characters to a dribble file called FILE.
+If FILE is nil, close any open dribble file.
+*/ )
+(file)
+Lisp_Object file;
+{
+/* This function can GC */
+/* XEmacs change: always close existing dribble file. */
+/* FSFmacs uses FILE *'s here.  With lstreams, that's unnecessary. */
+if (!NILP (Vdribble_file))
+{
+Lstream_close (XLSTREAM (Vdribble_file));
+Vdribble_file = Qnil;
+}
+if (!NILP (file))
+{
+int fd;
+file = Fexpand_file_name (file, Qnil);
+fd = creat ((char *) string_data (XSTRING (file)), 0666);
+if (fd < 0)
+	error ("Unable to create dribble file");
+Vdribble_file = make_filedesc_output_stream (fd, 0, 0, LSTR_CLOSING);
+}
+return Qnil;
+}
+/************************************************************************/
+/*                            initialization                            */
+/************************************************************************/
+void
+syms_of_event_stream (void)
+{
+defsymbol (&Qdisabled, "disabled");
+defsymbol (&Qcommand_event_p, "command-event-p");
+deferror (&Qundefined_keystroke_sequence, "undefined-keystroke-sequence",
+"Undefined keystroke sequence", Qerror);
+defsymbol (&Qcommand_execute, "command-execute");
+defsubr (&Srecent_keys);
+defsubr (&Sinput_pending_p);
+defsubr (&Senqueue_eval_event);
+defsubr (&Snext_event);
+defsubr (&Snext_command_event);
+defsubr (&Sdiscard_input);
+defsubr (&Ssit_for);
+defsubr (&Ssleep_for);
+defsubr (&Saccept_process_output);
+defsubr (&Sadd_timeout);
+defsubr (&Sdisable_timeout);
+defsubr (&Sadd_async_timeout);
+defsubr (&Sdisable_async_timeout);
+defsubr (&Sdispatch_event);
+defsubr (&Sread_key_sequence);
+defsubr (&Sthis_command_keys);
+defsubr (&Sreset_this_command_lengths);
+defsubr (&Sopen_dribble_file);
+defsymbol (&Qpre_command_hook, "pre-command-hook");
+defsymbol (&Qpost_command_hook, "post-command-hook");
+defsymbol (&Qunread_command_events, "unread-command-events");
+defsymbol (&Qunread_command_event, "unread-command-event");
+defsymbol (&Qpre_idle_hook, "pre-idle-hook");
+#ifdef ILL_CONCEIVED_HOOK
+defsymbol (&Qpost_command_idle_hook, "post-command-idle-hook");
+#endif
+#ifdef DEFERRED_ACTION_CRAP
+defsymbol (&Qdeferred_action_function, "deferred-action-function");
+#endif
+defsymbol (&Qretry_undefined_key_binding_unshifted,
+	     "retry-undefined-key-binding-unshifted");
+defsymbol (&Qauto_show_make_point_visible,
+	     "auto-show-make-point-visible");
+}
+void
+vars_of_event_stream (void)
+{
+#ifdef HAVE_X_WINDOWS
+vars_of_event_Xt ();
+#endif
+#if defined (DEBUG_TTY_EVENT_STREAM) || !defined (HAVE_X_WINDOWS)
+vars_of_event_tty ();
+#endif
+#ifdef HAVE_NEXTSTEP
+vars_of_event_ns ();
+#endif
+recent_keys_ring_index = 0;
+recent_keys_ring = make_vector (RECENT_KEYS_SIZE, Qnil);
+staticpro (&recent_keys_ring);
+Vthis_command_keys = Qnil;
+staticpro (&Vthis_command_keys);
+Vthis_command_keys_tail = Qnil;
+num_input_chars = 0;
+command_event_queue = Qnil;
+staticpro (&command_event_queue);
+command_event_queue_tail = Qnil;
+Vlast_selected_frame = Qnil;
+staticpro (&Vlast_selected_frame);
+pending_timeout_list = Qnil;
+staticpro (&pending_timeout_list);
+pending_async_timeout_list = Qnil;
+staticpro (&pending_async_timeout_list);
+Vtimeout_free_list = make_opaque_list (sizeof (struct timeout),
+					 mark_timeout);
+staticpro (&Vtimeout_free_list);
+the_low_level_timeout_blocktype =
+Blocktype_new (struct low_level_timeout_blocktype);
+something_happened = 0;
+last_point_position_buffer = Qnil;
+staticpro (&last_point_position_buffer);
+DEFVAR_INT ("echo-keystrokes", &echo_keystrokes /*
+*Nonzero means echo unfinished commands after this many seconds of pause.
+*/ );
+echo_keystrokes = 1;
+DEFVAR_INT ("auto-save-interval", &auto_save_interval /*
+*Number of keyboard input characters between auto-saves.
+Zero means disable autosaving due to number of characters typed.
+See also the variable `auto-save-timeout'.
+*/ );
+auto_save_interval = 300;
+DEFVAR_LISP ("pre-command-hook", &Vpre_command_hook /*
+Function or functions to run before every command.
+This may examine the `this-command' variable to find out what command
+is about to be run, or may change it to cause a different command to run.
+Function on this hook must be careful to avoid signalling errors!
+*/ );
+Vpre_command_hook = Qnil;
+DEFVAR_LISP ("post-command-hook", &Vpost_command_hook /*
+Function or functions to run after every command.
+This may examine the `this-command' variable to find out what command
+was just executed.
+*/ );
+Vpost_command_hook = Qnil;
+DEFVAR_LISP ("pre-idle-hook", &Vpre_idle_hook /*
+Normal hook run when XEmacs it about to be idle.
+This occurs whenever it is going to block, waiting for an event.
+This generally happens as a result of a call to `next-event',
+`next-command-event', `sit-for', `sleep-for', `accept-process-output',
+`x-get-selection', or various Energize-specific commands.
+Errors running the hook are caught and ignored.
+*/ );
+Vpre_idle_hook = Qnil;
+#ifdef ILL_CONCEIVED_HOOK
+/* Ill-conceived because it's not run in all sorts of cases
+where XEmacs is blocking.  That's what `pre-idle-hook'
+is designed to solve. */
+xxDEFVAR_LISP ("post-command-idle-hook", &Vpost_command_idle_hook /*
+Normal hook run after each command is executed, if idle.
+`post-command-idle-delay' specifies a time in microseconds that XEmacs
+must be idle for in order for the functions on this hook to be called.
+Errors running the hook are caught and ignored.
+*/ );
+Vpost_command_idle_hook = Qnil;
+xxDEFVAR_INT ("post-command-idle-delay", &post_command_idle_delay /*
+Delay time before running `post-command-idle-hook'.
+This is measured in microseconds.
+*/ );
+post_command_idle_delay = 5000;
+#endif /* ILL_CONCEIVED_HOOK */
+#ifdef DEFERRED_ACTION_CRAP
+/* Random FSFmacs crap.  There is absolutely nothing to gain,
+and a great deal to lose, in using this in place of just
+setting `post-command-hook'. */
+xxDEFVAR_LISP ("deferred-action-list", &Vdeferred_action_list /*
+List of deferred actions to be performed at a later time.
+The precise format isn't relevant here; we just check whether it is nil.
+*/ );
+Vdeferred_action_list = Qnil;
+xxDEFVAR_LISP ("deferred-action-function", &Vdeferred_action_function /*
+Function to call to handle deferred actions, after each command.
+This function is called with no arguments after each command
+whenever `deferred-action-list' is non-nil.
+*/ );
+Vdeferred_action_function = Qnil;
+#endif /* DEFERRED_ACTION_CRAP */
+DEFVAR_LISP ("last-command-event", &Vlast_command_event /*
+Last keyboard or mouse button event that was part of a command.  This
+variable is off limits: you may not set its value or modify the event that
+is its value, as it is destructively modified by `read-key-sequence'.  If
+you want to keep a pointer to this value, you must use `copy-event'.
+*/ );
+Vlast_command_event = Qnil;
+DEFVAR_LISP ("last-command-char", &Vlast_command_char /*
+If the value of `last-command-event' is a keyboard event, then
+this is the nearest ASCII equivalent to it.  This the the value that
+`self-insert-command' will put in the buffer.  Remember that there is
+NOT a 1:1 mapping between keyboard events and ASCII characters: the set
+of keyboard events is much larger, so writing code that examines this
+variable to determine what key has been typed is bad practice, unless
+you are certain that it will be one of a small set of characters.
+*/ );
+Vlast_command_char = Qnil;
+DEFVAR_LISP ("last-input-event", &Vlast_input_event /*
+Last keyboard or mouse button event received.  This variable is off
+limits: you may not set its value or modify the event that is its value, as
+it is destructively modified by `next-event'.  If you want to keep a pointer
+to this value, you must use `copy-event'.
+*/ );
+Vlast_input_event = Qnil;
+DEFVAR_LISP ("current-mouse-event", &Vcurrent_mouse_event /*
+The mouse-button event which invoked this command, or nil.
+This is usually what `(interactive \"e\")' returns.
+*/ );
+Vcurrent_mouse_event = Qnil;
+DEFVAR_LISP ("last-input-char", &Vlast_input_char /*
+If the value of `last-input-event' is a keyboard event, then
+this is the nearest ASCII equivalent to it.  Remember that there is
+NOT a 1:1 mapping between keyboard events and ASCII characters: the set
+of keyboard events is much larger, so writing code that examines this
+variable to determine what key has been typed is bad practice, unless
+you are certain that it will be one of a small set of characters.
+*/ );
+Vlast_input_char = Qnil;
+DEFVAR_LISP ("last-input-time", &Vlast_input_time /*
+The time (in seconds since Jan 1, 1970) of the last-command-event,
+represented as a cons of two 16-bit integers.  This is destructively
+modified, so copy it if you want to keep it.
+*/ );
+Vlast_input_time = Qnil;
+DEFVAR_LISP ("unread-command-events", &Vunread_command_events /*
+List of event objects to be read as next command input events.
+This can be used to simulate the receipt of events from the user.
+Normally this is nil.
+Events are removed from the front of this list.
+*/ );
+Vunread_command_events = Qnil;
+DEFVAR_LISP ("unread-command-event", &Vunread_command_event /*
+Obsolete.  Use `unread-command-events' instead.
+*/ );
+Vunread_command_event = Qnil;
+DEFVAR_LISP ("last-command", &Vlast_command /*
+The last command executed.  Normally a symbol with a function definition,
+but can be whatever was found in the keymap, or whatever the variable
+`this-command' was set to by that command.
+*/ );
+Vlast_command = Qnil;
+DEFVAR_LISP ("this-command", &Vthis_command /*
+The command now being executed.
+The command can set this variable; whatever is put here
+will be in `last-command' during the following command.
+*/ );
+Vthis_command = Qnil;
+DEFVAR_LISP ("help-char", &Vhelp_char /*
+Character to recognize as meaning Help.
+When it is read, do `(eval help-form)', and display result if it's a string.
+If the value of `help-form' is nil, this char can be read normally.
+This can be any form recognized as a single key specifier.
+To disable the help-char, set it to a negative number.
+*/ );
+Vhelp_char = make_char (8); /* C-h */
+DEFVAR_LISP ("help-form", &Vhelp_form /*
+Form to execute when character help-char is read.
+If the form returns a string, that string is displayed.
+If `help-form' is nil, the help char is not recognized.
+*/ );
+Vhelp_form = Qnil;
+DEFVAR_LISP ("prefix-help-command", &Vprefix_help_command /*
+Command to run when `help-char' character follows a prefix key.
+This command is used only when there is no actual binding
+for that character after that prefix key.
+*/ );
+Vprefix_help_command = Qnil;
+DEFVAR_CONST_LISP ("keyboard-translate-table", &Vkeyboard_translate_table /*
+Hash table used as translate table for keyboard input.
+Use `keyboard-translate' to portably add entries to this table.
+Each key-press event is looked up in this table as follows:
+-- If an entry maps a symbol to a symbol, then a key-press event whose
+keysym is the former symbol (with any modifiers at all) gets its
+keysym changed and its modifiers left alone.  This is useful for
+dealing with non-standard X keyboards, such as the grievous damage
+that Sun has inflicted upon the world.
+-- If an entry maps a character to a character, then a key-press event
+matching the former character gets converted to a key-press event
+matching the latter character.  This is useful on ASCII terminals
+for (e.g.) making C-\\ look like C-s, to get around flow-control
+problems.
+-- If an entry maps a character to a symbol, then a key-press event
+matching the character gets converted to a key-press event whose
+keysym is the given symbol and which has no modifiers.
+*/ );
+DEFVAR_LISP ("retry-undefined-key-binding-unshifted",
+&Vretry_undefined_key_binding_unshifted /*
+If a key-sequence which ends with a shifted keystroke is undefined
+and this variable is non-nil then the command lookup is retried again
+with the last key unshifted.  (e.g. C-X C-F would be retried as C-X C-f.)
+If lookup still fails, a normal error is signalled.  In general,
+you should *bind* this, not set it.
+*/ );
+Vretry_undefined_key_binding_unshifted = Qt;
+Vcontrolling_terminal = Qnil;
+staticpro (&Vcontrolling_terminal);
+Vdribble_file = Qnil;
+staticpro (&Vdribble_file);
+#ifdef DEBUG_XEMACS
+DEFVAR_INT ("debug-emacs-events", &debug_emacs_events /*
+If non-zero, display debug information about Emacs events that XEmacs sees.
+Information is displayed on stderr.
+Before the event, the source of the event is displayed in parentheses,
+and is one of the following:
+\(real)				A real event from the window system or
+				terminal driver, as far as XEmacs can tell.
+\(keyboard macro)		An event generated from a keyboard macro.
+\(unread-command-events)	An event taken from `unread-command-events'.
+\(unread-command-event)		An event taken from `unread-command-event'.
+\(command event queue)		An event taken from an internal queue.
+				Events end up on this queue when
+				`enqueue-eval-event' is called or when
+				user or eval events are received while
+				XEmacs is blocking (e.g. in `sit-for',
+				`sleep-for', or `accept-process-output',
+				or while waiting for the reply to an
+				X selection).
+\(->keyboard-translate-table)	The result of an event translated through
+				keyboard-translate-table.  Note that in
+				this case, two events are printed even
+				though only one is really generated.
+\(SIGINT)			A faked C-g resulting when XEmacs receives
+				a SIGINT (e.g. C-c was pressed in XEmacs'
+				controlling terminal or the signal was
+				explicitly sent to the XEmacs process).
+*/ );
+debug_emacs_events = 0;
+#endif
+}
+void
+complex_vars_of_event_stream (void)
+{
+Vkeyboard_translate_table = Fmake_hashtable (make_int (100), Qnil);
+}
+void
+init_event_stream (void)
+{
+if (initialized)
+{
+#ifdef HAVE_UNIXOID_EVENT_LOOP
+init_event_unixoid ();
+#endif
+#ifdef HAVE_X_WINDOWS
+if (!strcmp (display_use, "x"))
+	init_event_Xt_late ();
+else
+#endif
+#ifdef HAVE_NEXTSTEP
+	if (!strcmp (display_use, "ns"))
+	  init_event_ns_late ();
+	else
+#endif
+	  {
+	    /* For TTY's, use the Xt event loop if we can; it allows
+	       us to later open an X connection. */
+#if defined (HAVE_X_WINDOWS) && !defined (DEBUG_TTY_EVENT_STREAM)
+	    init_event_Xt_late ();
+#else
+	    init_event_tty_late ();
+#endif
+	  }
+init_interrupts_late ();
+}
+}
+/*
+useful testcases for v18/v19 compatibility:
+(defun foo ()
+(interactive)
+(setq unread-command-event (character-to-event ?A (allocate-event)))
+(setq x (list (read-char)
+;	  (read-key-sequence "") ; try it with and without this
+	  last-command-char last-input-char
+	  (recent-keys) (this-command-keys))))
+(global-set-key "\^Q" 'foo)
+without the read-key-sequence:
+^Q		==>  (65 17 65 [... ^Q] [^Q])
+^U^U^Q	==>  (65 17 65 [... ^U ^U ^Q] [^U ^U ^Q])
+^U^U^U^G^Q	==>  (65 17 65 [... ^U ^U ^U ^G ^Q] [^Q])
+with the read-key-sequence:
+^Qb		==>  (65 [b] 17 98 [... ^Q b] [b])
+^U^U^Qb	==>  (65 [b] 17 98 [... ^U ^U ^Q b] [b])
+^U^U^U^G^Qb	==>  (65 [b] 17 98 [... ^U ^U ^U ^G ^Q b] [b])
+;the evi-mode command "4dlj.j.j.j.j.j." is also a good testcase (gag)
+;(setq x (list (read-char) quit-flag))^J^G
+;(let ((inhibit-quit t)) (setq x (list (read-char) quit-flag)))^J^G
+;for BOTH, x should get set to (7 t), but no result should be printed.
+;also do this: make two frames, one viewing "*scratch*", the other "foo".
+;in *scratch*, type (sit-for 20)^J
+;wait a couple of seconds, move cursor to foo, type "a"
+;a should be inserted in foo.  Cursor highlighting should not change in
+;the meantime.
+;do it with sleep-for.  move cursor into foo, then back into *scratch*
+;before typing.
+;make sure ^G aborts both sit-for and sleep-for.
+(defun tst ()
+(list (condition-case c
+	    (sleep-for 20)
+	  (quit c))
+	(read-char)))
+(tst)^Ja^G    ==>  ((quit) 97) with no signal
+(tst)^J^Ga    ==>  ((quit) 97) with no signal
+(tst)^Jabc^G  ==>  ((quit) 97) with no signal, and "bc" inserted in buffer
+Do this:
+(setq enable-recursive-minibuffers t
+minibuffer-max-depth nil)
+ESC ESC ESC ESC	- there are now two minibuffers active
+C-g C-g C-g		- there should be active 0, not 1
+Similarly:
+C-x C-f ~ / ?		- wait for "Making completion list..." to display
+C-g			- wait for "Quit" to display
+C-g			- minibuffer should not be active
+however C-g before "Quit" is displayed should leave minibuffer active.
+;do it all in both v18 and v19 and make sure all results are the same.
+;all of these cases matter a lot, but some in quite subtle ways.
+*/

Mercurial > hg > xemacs-beta

comparison src/event-stream.c @ 0:376386a54a3c r19-14