keyboard.c 373 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Keyboard and mouse input; editor command loop.
2 3
   Copyright (C) 1985, 1986, 1987, 1988, 1989, 1993, 1994, 1995,
                 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004,
4
                 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
5 6 7

This file is part of GNU Emacs.

8
GNU Emacs is free software: you can redistribute it and/or modify
Jim Blandy's avatar
Jim Blandy committed
9
it under the terms of the GNU General Public License as published by
10 11
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Jim Blandy's avatar
Jim Blandy committed
12 13 14 15 16 17 18

GNU Emacs 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
19
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
Jim Blandy's avatar
Jim Blandy committed
20

21
#include <config.h>
22
#include <signal.h>
Jim Blandy's avatar
Jim Blandy committed
23
#include <stdio.h>
24
#include "lisp.h"
Jim Blandy's avatar
Jim Blandy committed
25 26
#include "termchar.h"
#include "termopts.h"
27
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
28 29
#include "termhooks.h"
#include "macros.h"
30
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
31 32 33
#include "window.h"
#include "commands.h"
#include "buffer.h"
34
#include "character.h"
Jim Blandy's avatar
Jim Blandy committed
35
#include "disptab.h"
36
#include "dispextern.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
37
#include "syntax.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
38
#include "intervals.h"
Stefan Monnier's avatar
Stefan Monnier committed
39
#include "keymap.h"
40
#include "blockinput.h"
41
#include "puresize.h"
42 43
#include "systime.h"
#include "atimer.h"
Jim Blandy's avatar
Jim Blandy committed
44 45 46
#include <setjmp.h>
#include <errno.h>

47 48 49
#ifdef HAVE_GTK_AND_PTHREAD
#include <pthread.h>
#endif
50 51 52 53
#ifdef MSDOS
#include "msdos.h"
#include <time.h>
#else /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
54 55 56
#ifndef VMS
#include <sys/ioctl.h>
#endif
57
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
58

Jim Blandy's avatar
Jim Blandy committed
59 60
#include "syssignal.h"

61 62 63 64 65
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

66 67 68 69
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

70 71 72 73 74
/* This is to get the definitions of the XK_ symbols.  */
#ifdef HAVE_X_WINDOWS
#include "xterm.h"
#endif

75 76 77 78
#ifdef HAVE_NTGUI
#include "w32term.h"
#endif /* HAVE_NTGUI */

79
#ifdef MAC_OS
80 81 82
#include "macterm.h"
#endif

83 84 85 86
#ifdef HAVE_NS
#include "nsterm.h"
#endif

87
#ifndef USE_CRT_DLL
Jim Blandy's avatar
Jim Blandy committed
88
extern int errno;
89
#endif
Jim Blandy's avatar
Jim Blandy committed
90

91 92 93
/* Variables for blockinput.h: */

/* Non-zero if interrupt input is blocked right now.  */
94
volatile int interrupt_input_blocked;
95 96 97

/* Nonzero means an input interrupt has arrived
   during the current critical section.  */
98
int interrupt_input_pending;
99

100
#define KBD_BUFFER_SIZE 4096
Jim Blandy's avatar
Jim Blandy committed
101

102 103 104 105
#ifdef MULTI_KBOARD
KBOARD *initial_kboard;
KBOARD *current_kboard;
KBOARD *all_kboards;
106
int single_kboard;
107
#else
108
KBOARD the_only_kboard;
109
#endif
110

Jim Blandy's avatar
Jim Blandy committed
111
/* Non-nil disable property on a command means
112 113
   do not execute it; call disabled-command-function's value instead.  */
Lisp_Object Qdisabled, Qdisabled_command_function;
Jim Blandy's avatar
Jim Blandy committed
114

115
#define NUM_RECENT_KEYS (300)
Jim Blandy's avatar
Jim Blandy committed
116 117
int recent_keys_index;	/* Index for storing next element into recent_keys */
int total_keys;		/* Total number of elements stored into recent_keys */
118
Lisp_Object recent_keys; /* Vector holds the last NUM_RECENT_KEYS keystrokes */
Jim Blandy's avatar
Jim Blandy committed
119

120 121 122 123 124 125 126
/* Vector holding the key sequence that invoked the current command.
   It is reused for each command, and it may be longer than the current
   sequence; this_command_key_count indicates how many elements
   actually mean something.
   It's easier to staticpro a single Lisp_Object than an array.  */
Lisp_Object this_command_keys;
int this_command_key_count;
Jim Blandy's avatar
Jim Blandy committed
127

128 129 130 131
/* 1 after calling Freset_this_command_lengths.
   Usually it is 0.  */
int this_command_key_count_reset;

132 133 134 135 136
/* This vector is used as a buffer to record the events that were actually read
   by read_key_sequence.  */
Lisp_Object raw_keybuf;
int raw_keybuf_count;

137 138 139
/* Non-nil if the present key sequence was obtained by shift translation.  */
Lisp_Object Vthis_command_keys_shift_translated;

140
#define GROW_RAW_KEYBUF							\
141
 if (raw_keybuf_count == XVECTOR (raw_keybuf)->size)			\
142
   raw_keybuf = larger_vector (raw_keybuf, raw_keybuf_count * 2, Qnil)  \
143

144 145 146 147
/* Number of elements of this_command_keys
   that precede this key sequence.  */
int this_single_command_key_start;

148 149 150 151 152
/* Record values of this_command_key_count and echo_length ()
   before this command was read.  */
static int before_command_key_count;
static int before_command_echo_length;

Jim Blandy's avatar
Jim Blandy committed
153 154
extern int minbuf_level;

155 156
extern int message_enable_multibyte;

157 158 159 160 161
/* If non-nil, the function that implements the display of help.
   It's called with one argument, the help string to display.  */

Lisp_Object Vshow_help_function;

Jim Blandy's avatar
Jim Blandy committed
162
/* Nonzero means do menu prompting.  */
163

Jim Blandy's avatar
Jim Blandy committed
164 165 166
static int menu_prompting;

/* Character to see next line of menu prompt.  */
167

Jim Blandy's avatar
Jim Blandy committed
168 169 170
static Lisp_Object menu_prompt_more_char;

/* For longjmp to where kbd input is being done.  */
171

Jim Blandy's avatar
Jim Blandy committed
172 173 174 175 176 177
static jmp_buf getcjmp;

/* True while doing kbd input.  */
int waiting_for_input;

/* True while displaying for echoing.   Delays C-g throwing.  */
178

179
int echoing;
Jim Blandy's avatar
Jim Blandy committed
180

181 182 183 184 185
/* Non-null means we can start echoing at the next input pause even
   though there is something in the echo area.  */

static struct kboard *ok_to_echo_at_next_pause;

186 187 188 189
/* The kboard last echoing, or null for none.  Reset to 0 in
   cancel_echoing.  If non-null, and a current echo area message
   exists, and echo_message_buffer is eq to the current message
   buffer, we know that the message comes from echo_kboard.  */
190

191
struct kboard *echo_kboard;
192

193 194 195
/* The buffer used for echoing.  Set in echo_now, reset in
   cancel_echoing.  */

196
Lisp_Object echo_message_buffer;
197

198 199 200
/* Nonzero means disregard local maps for the menu bar.  */
static int inhibit_local_menu_bar_menus;

201
/* Nonzero means C-g should cause immediate error-signal.  */
Jim Blandy's avatar
Jim Blandy committed
202 203
int immediate_quit;

204 205 206
/* The user's hook function for outputting an error message.  */
Lisp_Object Vcommand_error_function;

207 208 209
/* The user's ERASE setting.  */
Lisp_Object Vtty_erase_char;

Jim Blandy's avatar
Jim Blandy committed
210
/* Character to recognize as the help char.  */
211
Lisp_Object Vhelp_char;
Jim Blandy's avatar
Jim Blandy committed
212

Karl Heuer's avatar
Karl Heuer committed
213 214 215
/* List of other event types to recognize as meaning "help".  */
Lisp_Object Vhelp_event_list;

Jim Blandy's avatar
Jim Blandy committed
216 217 218
/* Form to execute when help char is typed.  */
Lisp_Object Vhelp_form;

219 220 221
/* Command to run when the help character follows a prefix key.  */
Lisp_Object Vprefix_help_command;

222 223
/* List of items that should move to the end of the menu bar.  */
Lisp_Object Vmenu_bar_final_items;
224

225 226 227 228 229 230
/* Non-nil means show the equivalent key-binding for
   any M-x command that has one.
   The value can be a length of time to show the message for.
   If the value is non-nil and not a number, we wait 2 seconds.  */
Lisp_Object Vsuggest_key_bindings;

231 232 233 234
/* How long to display an echo-area message when the minibuffer is active.
   If the value is not a number, such messages don't time out.  */
Lisp_Object Vminibuffer_message_timeout;

Jim Blandy's avatar
Jim Blandy committed
235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
/* Character that causes a quit.  Normally C-g.

   If we are running on an ordinary terminal, this must be an ordinary
   ASCII char, since we want to make it our interrupt character.

   If we are not running on an ordinary terminal, it still needs to be
   an ordinary ASCII char.  This character needs to be recognized in
   the input interrupt handler.  At this point, the keystroke is
   represented as a struct input_event, while the desired quit
   character is specified as a lispy event.  The mapping from struct
   input_events to lispy events cannot run in an interrupt handler,
   and the reverse mapping is difficult for anything but ASCII
   keystrokes.

   FOR THESE ELABORATE AND UNSATISFYING REASONS, quit_char must be an
   ASCII character.  */
int quit_char;

extern Lisp_Object current_global_map;
extern int minibuf_level;

256 257 258
/* If non-nil, this is a map that overrides all other local maps.  */
Lisp_Object Voverriding_local_map;

259 260 261
/* If non-nil, Voverriding_local_map applies to the menu bar.  */
Lisp_Object Voverriding_local_map_menu_flag;

262 263 264 265
/* Keymap that defines special misc events that should
   be processed immediately at a low level.  */
Lisp_Object Vspecial_event_map;

Jim Blandy's avatar
Jim Blandy committed
266 267 268 269
/* Current depth in recursive edits.  */
int command_loop_level;

/* Total number of times command_loop has read a key sequence.  */
270
EMACS_INT num_input_keys;
Jim Blandy's avatar
Jim Blandy committed
271 272 273 274

/* Last input character read as a command.  */
Lisp_Object last_command_char;

275 276 277 278
/* Last input character read as a command, not counting menus
   reached by the mouse.  */
Lisp_Object last_nonmenu_event;

Jim Blandy's avatar
Jim Blandy committed
279 280 281
/* Last input character read for any purpose.  */
Lisp_Object last_input_char;

Jim Blandy's avatar
Jim Blandy committed
282
/* If not Qnil, a list of objects to be read as subsequent command input.  */
283
Lisp_Object Vunread_command_events;
Jim Blandy's avatar
Jim Blandy committed
284

285 286 287 288 289 290 291 292
/* If not Qnil, a list of objects to be read as subsequent command input
   including input method processing.  */
Lisp_Object Vunread_input_method_events;

/* If not Qnil, a list of objects to be read as subsequent command input
   but NOT including input method processing.  */
Lisp_Object Vunread_post_input_method_events;

293
/* If not -1, an event to be read as subsequent command input.  */
294
EMACS_INT unread_command_char;
295

296 297
/* If not Qnil, this is a switch-frame event which we decided to put
   off until the end of a key sequence.  This should be read as the
Jim Blandy's avatar
Jim Blandy committed
298
   next command input, after any unread_command_events.
299 300 301 302 303

   read_key_sequence uses this to delay switch-frame events until the
   end of the key sequence; Fread_char uses it to put off switch-frame
   events until a non-ASCII event is acceptable as input.  */
Lisp_Object unread_switch_frame;
304

305
/* A mask of extra modifier bits to put into every keyboard char.  */
306
EMACS_INT extra_keyboard_modifiers;
307

Jim Blandy's avatar
Jim Blandy committed
308 309 310 311 312 313 314 315
/* Char to use as prefix when a meta character is typed in.
   This is bound on entry to minibuffer in case ESC is changed there.  */

Lisp_Object meta_prefix_char;

/* Last size recorded for a current buffer which is not a minibuffer.  */
static int last_non_minibuf_size;

316
/* Number of idle seconds before an auto-save and garbage collection.  */
Jim Blandy's avatar
Jim Blandy committed
317 318 319
static Lisp_Object Vauto_save_timeout;

/* Total number of times read_char has returned.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
320
int num_input_events;
Jim Blandy's avatar
Jim Blandy committed
321

322
/* Total number of times read_char has returned, outside of macros.  */
323
EMACS_INT num_nonmacro_input_events;
324

Jim Blandy's avatar
Jim Blandy committed
325 326 327
/* Auto-save automatically when this many characters have been typed
   since the last time.  */

328
static EMACS_INT auto_save_interval;
Jim Blandy's avatar
Jim Blandy committed
329

330
/* Value of num_nonmacro_input_events as of last auto save.  */
Jim Blandy's avatar
Jim Blandy committed
331 332 333 334

int last_auto_save;

/* The command being executed by the command loop.
335 336
   Commands may set this, and the value set will be copied into
   current_kboard->Vlast_command instead of the actual command.  */
337 338 339 340
Lisp_Object Vthis_command;

/* This is like Vthis_command, except that commands never set it.  */
Lisp_Object real_this_command;
Jim Blandy's avatar
Jim Blandy committed
341

342 343 344 345
/* If the lookup of the command returns a binding, the original
   command is stored in this-original-command.  It is nil otherwise.  */
Lisp_Object Vthis_original_command;

346
/* The value of point when the last command was started.  */
347 348
int last_point_position;

349 350 351
/* The buffer that was current when the last command was started.  */
Lisp_Object last_point_position_buffer;

352 353 354
/* The window that was selected when the last command was started.  */
Lisp_Object last_point_position_window;

355 356 357 358 359 360 361 362 363 364 365 366
/* The frame in which the last input event occurred, or Qmacro if the
   last event came from a macro.  We use this to determine when to
   generate switch-frame events.  This may be cleared by functions
   like Fselect_frame, to make sure that a switch-frame event is
   generated by the next character.  */
Lisp_Object internal_last_event_frame;

/* A user-visible version of the above, intended to allow users to
   figure out where the last event came from, if the event doesn't
   carry that information itself (i.e. if it was a character).  */
Lisp_Object Vlast_event_frame;

Jim Blandy's avatar
Jim Blandy committed
367 368
/* The timestamp of the last input event we received from the X server.
   X Windows wants this for selection ownership.  */
Jim Blandy's avatar
Jim Blandy committed
369 370 371 372 373
unsigned long last_event_timestamp;

Lisp_Object Qself_insert_command;
Lisp_Object Qforward_char;
Lisp_Object Qbackward_char;
374
Lisp_Object Qundefined;
375
Lisp_Object Qtimer_event_handler;
Jim Blandy's avatar
Jim Blandy committed
376 377 378 379 380

/* read_key_sequence stores here the command definition of the
   key sequence that it reads.  */
Lisp_Object read_key_sequence_cmd;

381 382 383
/* Echo unfinished commands after this many seconds of pause.  */
Lisp_Object Vecho_keystrokes;

Jim Blandy's avatar
Jim Blandy committed
384 385 386
/* Form to evaluate (if non-nil) when Emacs is started.  */
Lisp_Object Vtop_level;

387 388 389 390
/* If non-nil, this implements the current input method.  */
Lisp_Object Vinput_method_function;
Lisp_Object Qinput_method_function;

391 392 393 394
/* When we call Vinput_method_function,
   this holds the echo area message that was just erased.  */
Lisp_Object Vinput_method_previous_message;

395 396
/* Non-nil means deactivate the mark at end of this command.  */
Lisp_Object Vdeactivate_mark;
Stefan Monnier's avatar
Stefan Monnier committed
397
Lisp_Object Qdeactivate_mark;
398

399 400 401 402 403
/* Menu bar specified in Lucid Emacs fashion.  */

Lisp_Object Vlucid_menu_bar_dirty_flag;
Lisp_Object Qrecompute_lucid_menubar, Qactivate_menubar_hook;

404
Lisp_Object Qecho_area_clear_hook;
405

406
/* Hooks to run before and after each command.  */
407 408
Lisp_Object Qpre_command_hook, Vpre_command_hook;
Lisp_Object Qpost_command_hook, Vpost_command_hook;
409
Lisp_Object Qcommand_hook_internal, Vcommand_hook_internal;
410

411 412 413
/* Parent keymap of terminal-local function-key-map instances.  */
Lisp_Object Vfunction_key_map;

414
/* Keymap of key translations that can override keymaps.  */
415
Lisp_Object Vkey_translation_map;
416

417 418 419 420 421 422
/* 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;
423
Lisp_Object Qdeferred_action_function;
424

425 426 427
Lisp_Object Qinput_method_exit_on_first_char;
Lisp_Object Qinput_method_use_echo_area;

Jim Blandy's avatar
Jim Blandy committed
428 429 430 431 432 433 434 435
/* File in which we write all commands we read.  */
FILE *dribble;

/* Nonzero if input is available.  */
int input_pending;

extern char *pending_malloc_warning;

436
/* Circular buffer for pre-read keyboard input.  */
437

438 439 440 441
static struct input_event kbd_buffer[KBD_BUFFER_SIZE];

/* Pointer to next available character in kbd_buffer.
   If kbd_fetch_ptr == kbd_store_ptr, the buffer is empty.
442
   This may be kbd_buffer + KBD_BUFFER_SIZE, meaning that the
443 444 445 446 447 448
   next available char is in kbd_buffer[0].  */
static struct input_event *kbd_fetch_ptr;

/* Pointer to next place to store character in kbd_buffer.  This
   may be kbd_buffer + KBD_BUFFER_SIZE, meaning that the next
   character should go in kbd_buffer[0].  */
449
static struct input_event * volatile kbd_store_ptr;
450 451 452 453

/* The above pair of variables forms a "queue empty" flag.  When we
   enqueue a non-hook event, we increment kbd_store_ptr.  When we
   dequeue a non-hook event, we increment kbd_fetch_ptr.  We say that
Glenn Morris's avatar
Glenn Morris committed
454
   there is input available if the two pointers are not equal.
455 456 457 458 459

   Why not just have a flag set and cleared by the enqueuing and
   dequeuing functions?  Such a flag could be screwed up by interrupts
   at inopportune times.  */

Karl Heuer's avatar
Karl Heuer committed
460
/* If this flag is non-nil, we check mouse_moved to see when the
461 462
   mouse moves, and motion events will appear in the input stream.
   Otherwise, mouse motion is ignored.  */
463
Lisp_Object do_mouse_tracking;
Jim Blandy's avatar
Jim Blandy committed
464 465 466

/* Symbols to head events.  */
Lisp_Object Qmouse_movement;
467
Lisp_Object Qscroll_bar_movement;
468
Lisp_Object Qswitch_frame;
469
Lisp_Object Qdelete_frame;
470 471
Lisp_Object Qiconify_frame;
Lisp_Object Qmake_frame_visible;
Pavel Janík's avatar
Pavel Janík committed
472
Lisp_Object Qselect_window;
473
Lisp_Object Qhelp_echo;
474

Nick Roberts's avatar
Nick Roberts committed
475
#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
476 477 478
Lisp_Object Qmouse_fixup_help_message;
#endif

Jim Blandy's avatar
Jim Blandy committed
479 480 481
/* Symbols to denote kinds of events.  */
Lisp_Object Qfunction_key;
Lisp_Object Qmouse_click;
482
#if defined (WINDOWSNT) || defined (MAC_OS)
483
Lisp_Object Qlanguage_change;
484
#endif
485
Lisp_Object Qdrag_n_drop;
486
Lisp_Object Qsave_session;
487 488 489
#ifdef MAC_OS
Lisp_Object Qmac_apple_event;
#endif
490 491 492
#ifdef HAVE_DBUS
Lisp_Object Qdbus_event;
#endif
Jim Blandy's avatar
Jim Blandy committed
493 494 495 496
/* Lisp_Object Qmouse_movement; - also an event header */

/* Properties of event headers.  */
Lisp_Object Qevent_kind;
497
Lisp_Object Qevent_symbol_elements;
Jim Blandy's avatar
Jim Blandy committed
498

499 500
/* menu item parts */
Lisp_Object Qmenu_alias;
501
Lisp_Object Qmenu_enable;
502 503
Lisp_Object QCenable, QCvisible, QChelp, QCfilter, QCkeys, QCkey_sequence;
Lisp_Object QCbutton, QCtoggle, QCradio;
504 505
extern Lisp_Object Vdefine_key_rebound_commands;
extern Lisp_Object Qmenu_item;
506

507 508 509 510 511 512 513 514 515 516 517 518 519
/* An event header symbol HEAD may have a property named
   Qevent_symbol_element_mask, which is of the form (BASE MODIFIERS);
   BASE is the base, unmodified version of HEAD, and MODIFIERS is the
   mask of modifiers applied to it.  If present, this is used to help
   speed up parse_modifiers.  */
Lisp_Object Qevent_symbol_element_mask;

/* An unmodified event header BASE may have a property named
   Qmodifier_cache, which is an alist mapping modifier masks onto
   modified versions of BASE.  If present, this helps speed up
   apply_modifiers.  */
Lisp_Object Qmodifier_cache;

520
/* Symbols to use for parts of windows.  */
Jim Blandy's avatar
Jim Blandy committed
521
Lisp_Object Qmode_line;
Jim Blandy's avatar
Jim Blandy committed
522
Lisp_Object Qvertical_line;
523
Lisp_Object Qvertical_scroll_bar;
524
Lisp_Object Qmenu_bar;
525
extern Lisp_Object Qleft_margin, Qright_margin;
Kenichi Handa's avatar
Kenichi Handa committed
526 527
extern Lisp_Object Qleft_fringe, Qright_fringe;
extern Lisp_Object QCmap;
528

529 530
Lisp_Object recursive_edit_unwind (), command_loop ();
Lisp_Object Fthis_command_keys ();
531
Lisp_Object Qextended_command_history;
532
EMACS_TIME timer_check ();
Jim Blandy's avatar
Jim Blandy committed
533

534
extern Lisp_Object Vhistory_length, Vtranslation_table_for_input;
535

536 537
extern char *x_get_keysym_name ();

538
static void record_menu_key ();
539
static int echo_length ();
540

541 542
Lisp_Object Qpolling_period;

543
/* List of absolute timers.  Appears in order of next scheduled event.  */
544 545
Lisp_Object Vtimer_list;

546 547 548
/* List of idle time timers.  Appears in order of next scheduled event.  */
Lisp_Object Vtimer_idle_list;

549 550 551
/* Incremented whenever a timer is run.  */
int timers_run;

552 553
extern Lisp_Object Vprint_level, Vprint_length;

Jim Blandy's avatar
Jim Blandy committed
554 555 556
/* Address (if not 0) of EMACS_TIME to zero out if a SIGIO interrupt
   happens.  */
EMACS_TIME *input_available_clear_time;
Jim Blandy's avatar
Jim Blandy committed
557 558 559 560 561 562 563 564 565 566 567 568 569 570 571

/* Nonzero means use SIGIO interrupts; zero means use CBREAK mode.
   Default is 1 if INTERRUPT_INPUT is defined.  */
int interrupt_input;

/* Nonzero while interrupts are temporarily deferred during redisplay.  */
int interrupts_deferred;

/* Allow m- file to inhibit use of FIONREAD.  */
#ifdef BROKEN_FIONREAD
#undef FIONREAD
#endif

/* We are unable to use interrupts if FIONREAD is not available,
   so flush SIGIO so we won't try.  */
Steven Tamm's avatar
Steven Tamm committed
572
#if !defined (FIONREAD)
Jim Blandy's avatar
Jim Blandy committed
573 574 575 576 577
#ifdef SIGIO
#undef SIGIO
#endif
#endif

578
/* If we support a window system, turn on the code to poll periodically
579
   to detect C-g.  It isn't actually used when doing interrupt input.  */
Andrew Choi's avatar
In src:  
Andrew Choi committed
580
#if defined(HAVE_WINDOW_SYSTEM) && !defined(USE_ASYNC_EVENTS)
Jim Blandy's avatar
Jim Blandy committed
581 582
#define POLL_FOR_INPUT
#endif
583 584 585 586

/* After a command is executed, if point is moved into a region that
   has specific properties (e.g. composition, display), we adjust
   point to the boundary of the region.  But, if a command sets this
Pavel Janík's avatar
Pavel Janík committed
587
   variable to non-nil, we suppress this point adjustment.  This
588
   variable is set to nil before reading a command.  */
589

590 591 592
Lisp_Object Vdisable_point_adjustment;

/* If non-nil, always disable point adjustment.  */
593

594 595
Lisp_Object Vglobal_disable_point_adjustment;

596 597 598 599
/* The time when Emacs started being idle.  */

static EMACS_TIME timer_idleness_start_time;

600 601 602 603 604
/* After Emacs stops being idle, this saves the last value
   of timer_idleness_start_time from when it was idle.  */

static EMACS_TIME timer_last_idleness_start_time;

605 606 607 608 609
/* If non-nil, events produced by disabled menu items and tool-bar
   buttons are not ignored.  Help functions bind this to allow help on
   those items and buttons.  */
Lisp_Object Venable_disabled_menus_and_buttons;

Jim Blandy's avatar
Jim Blandy committed
610 611 612

/* Global variable declarations.  */

613 614 615 616 617
/* Flags for readable_events.  */
#define READABLE_EVENTS_DO_TIMERS_NOW		(1 << 0)
#define READABLE_EVENTS_FILTER_EVENTS		(1 << 1)
#define READABLE_EVENTS_IGNORE_SQUEEZABLES	(1 << 2)

Jim Blandy's avatar
Jim Blandy committed
618 619 620
/* Function for init_keyboard to call with no args (if nonzero).  */
void (*keyboard_init_hook) ();

621 622 623 624 625
static int read_avail_input P_ ((int));
static void get_input_pending P_ ((int *, int));
static int readable_events P_ ((int));
static Lisp_Object read_char_x_menu_prompt P_ ((int, Lisp_Object *,
						Lisp_Object, int *));
626
static Lisp_Object read_char_x_menu_prompt ();
627 628 629
static Lisp_Object read_char_minibuf_menu_prompt P_ ((int, int,
						      Lisp_Object *));
static Lisp_Object make_lispy_event P_ ((struct input_event *));
Nick Roberts's avatar
Nick Roberts committed
630
#if defined (HAVE_MOUSE) || defined (HAVE_GPM)
631 632 633 634
static Lisp_Object make_lispy_movement P_ ((struct frame *, Lisp_Object,
					    enum scroll_bar_part,
					    Lisp_Object, Lisp_Object,
					    unsigned long));
635
#endif
636 637 638 639 640
static Lisp_Object modify_event_symbol P_ ((int, unsigned, Lisp_Object,
					    Lisp_Object, char **,
					    Lisp_Object *, unsigned));
static Lisp_Object make_lispy_switch_frame P_ ((Lisp_Object));
static void save_getcjmp P_ ((jmp_buf));
Andreas Schwab's avatar
Andreas Schwab committed
641
static void save_getcjmp ();
642
static void restore_getcjmp P_ ((jmp_buf));
643
static Lisp_Object apply_modifiers P_ ((int, Lisp_Object));
644
static void clear_event P_ ((struct input_event *));
645
#ifdef MULTI_KBOARD
646
static Lisp_Object restore_kboard_configuration P_ ((Lisp_Object));
647
#endif
648
static SIGTYPE interrupt_signal P_ ((int signalnum));
649
static void handle_interrupt P_ ((void));
650 651 652
static void timer_start_idle P_ ((void));
static void timer_stop_idle P_ ((void));
static void timer_resume_idle P_ ((void));
653 654 655
static SIGTYPE handle_user_signal P_ ((int));
static char *find_user_signal_name P_ ((int));
static int store_user_signal_events P_ ((void));
Jim Blandy's avatar
Jim Blandy committed
656

657 658 659
/* Nonzero means don't try to suspend even if the operating system seems
   to support it.  */
static int cannot_suspend;
660 661

extern Lisp_Object Qidentity, Qonly;
662

Jim Blandy's avatar
Jim Blandy committed
663 664 665 666
/* Install the string STR as the beginning of the string of echoing,
   so that it serves as a prompt for the next character.
   Also start echoing.  */

Andreas Schwab's avatar
Andreas Schwab committed
667
void
Jim Blandy's avatar
Jim Blandy committed
668
echo_prompt (str)
669
     Lisp_Object str;
Jim Blandy's avatar
Jim Blandy committed
670
{
671
  current_kboard->echo_string = str;
672
  current_kboard->echo_after_prompt = SCHARS (str);
673
  echo_now ();
Jim Blandy's avatar
Jim Blandy committed
674 675
}

676
/* Add C to the echo string, if echoing is going on.
Jim Blandy's avatar
Jim Blandy committed
677 678 679
   C can be a character, which is printed prettily ("M-C-x" and all that
   jazz), or a symbol, whose name is printed.  */

Andreas Schwab's avatar
Andreas Schwab committed
680
void
Jim Blandy's avatar
Jim Blandy committed
681 682 683
echo_char (c)
     Lisp_Object c;
{
684
  if (current_kboard->immediate_echo)
Jim Blandy's avatar
Jim Blandy committed
685
    {
686 687 688 689
      int size = KEY_DESCRIPTION_SIZE + 100;
      char *buffer = (char *) alloca (size);
      char *ptr = buffer;
      Lisp_Object echo_string;
Jim Blandy's avatar
Jim Blandy committed
690

691
      echo_string = current_kboard->echo_string;
Juanma Barranquero's avatar
Juanma Barranquero committed
692

Jim Blandy's avatar
Jim Blandy committed
693
      /* If someone has passed us a composite event, use its head symbol.  */
694
      c = EVENT_HEAD (c);
Jim Blandy's avatar
Jim Blandy committed
695

696
      if (INTEGERP (c))
Jim Blandy's avatar
Jim Blandy committed
697
	{
698
	  ptr = push_key_description (XINT (c), ptr, 1);
Jim Blandy's avatar
Jim Blandy committed
699
	}
700
      else if (SYMBOLP (c))
Jim Blandy's avatar
Jim Blandy committed
701
	{
702 703
	  Lisp_Object name = SYMBOL_NAME (c);
	  int nbytes = SBYTES (name);
Juanma Barranquero's avatar
Juanma Barranquero committed
704

705
	  if (size - (ptr - buffer) < nbytes)
706 707
	    {
	      int offset = ptr - buffer;
708
	      size = max (2 * size, size + nbytes);
709 710 711 712
	      buffer = (char *) alloca (size);
	      ptr = buffer + offset;
	    }

713 714
	  ptr += copy_text (SDATA (name), ptr, nbytes,
			    STRING_MULTIBYTE (name), 1);
Jim Blandy's avatar
Jim Blandy committed
715 716
	}

717
      if ((NILP (echo_string) || SCHARS (echo_string) == 0)
Karl Heuer's avatar
Karl Heuer committed
718
	  && help_char_p (c))
Jim Blandy's avatar
Jim Blandy committed
719
	{
720 721
	  const char *text = " (Type ? for further options)";
	  int len = strlen (text);
Juanma Barranquero's avatar
Juanma Barranquero committed
722

723 724 725 726 727 728 729 730 731 732
	  if (size - (ptr - buffer) < len)
	    {
	      int offset = ptr - buffer;
	      size += len;
	      buffer = (char *) alloca (size);
	      ptr = buffer + offset;
	    }

	  bcopy (text, ptr, len);
	  ptr += len;
Jim Blandy's avatar
Jim Blandy committed
733 734
	}

735 736
      /* Replace a dash from echo_dash with a space, otherwise
	 add a space at the end as a separator between keys.  */
737
      if (STRINGP (echo_string)
738
	  && SCHARS (echo_string) > 1)
739
	{
740 741 742 743
	  Lisp_Object last_char, prev_char, idx;

	  idx = make_number (SCHARS (echo_string) - 2);
	  prev_char = Faref (echo_string, idx);
744 745 746 747

	  idx = make_number (SCHARS (echo_string) - 1);
	  last_char = Faref (echo_string, idx);

748 749 750
	  /* We test PREV_CHAR to make sure this isn't the echoing
	     of a minus-sign.  */
	  if (XINT (last_char) == '-' && XINT (prev_char) != ' ')
751 752 753 754
	    Faset (echo_string, idx, make_number (' '));
	  else
	    echo_string = concat2 (echo_string, build_string (" "));
	}
755 756
      else if (STRINGP (echo_string))
	echo_string = concat2 (echo_string, build_string (" "));
757 758 759

      current_kboard->echo_string
	= concat2 (echo_string, make_string (buffer, ptr - buffer));
Jim Blandy's avatar
Jim Blandy committed
760

761
      echo_now ();
Jim Blandy's avatar
Jim Blandy committed
762 763 764 765 766 767
    }
}

/* Temporarily add a dash to the end of the echo string if it's not
   empty, so that it serves as a mini-prompt for the very next character.  */

Andreas Schwab's avatar
Andreas Schwab committed
768
void
Jim Blandy's avatar
Jim Blandy committed
769 770
echo_dash ()
{
771 772 773 774
  /* Do nothing if not echoing at all.  */
  if (NILP (current_kboard->echo_string))
    return;

775
  if (!current_kboard->immediate_echo
776
      && SCHARS (current_kboard->echo_string) == 0)
Jim Blandy's avatar
Jim Blandy committed
777
    return;
Juanma Barranquero's avatar
Juanma Barranquero committed
778

779
  /* Do nothing if we just printed a prompt.  */
780
  if (current_kboard->echo_after_prompt
781
      == SCHARS (current_kboard->echo_string))
782
    return;
Juanma Barranquero's avatar
Juanma Barranquero committed
783

784 785 786
  /* Do nothing if we have already put a dash at the end.  */
  if (SCHARS (current_kboard->echo_string) > 1)
    {
787
      Lisp_Object last_char, prev_char, idx;
788

789 790
      idx = make_number (SCHARS (current_kboard->echo_string) - 2);
      prev_char = Faref (current_kboard->echo_string, idx);
791

792 793
      idx = make_number (SCHARS (current_kboard->echo_string) - 1);
      last_char = Faref (current_kboard->echo_string, idx);
794

795 796
      if (XINT (last_char) == '-' && XINT (prev_char) != ' ')
	return;
797 798
    }

Jim Blandy's avatar
Jim Blandy committed
799 800
  /* Put a dash at the end of the buffer temporarily,
     but make it go away when the next character is added.  */
801 802
  current_kboard->echo_string = concat2 (current_kboard->echo_string,
					 build_string ("-"));
803
  echo_now ();
Jim Blandy's avatar
Jim Blandy committed
804 805 806 807 808
}

/* Display the current echo string, and begin echoing if not already
   doing so.  */

809
void
810
echo_now ()
Jim Blandy's avatar
Jim Blandy committed
811
{
812
  if (!current_kboard->immediate_echo)
Jim Blandy's avatar
Jim Blandy committed
813 814
    {
      int i;
815
      current_kboard->immediate_echo = 1;
Jim Blandy's avatar
Jim Blandy committed
816 817

      for (i = 0; i < this_command_key_count; i++)
818 819
	{
	  Lisp_Object c;
820 821 822 823 824 825 826

	  /* Set before_command_echo_length to the value that would
	     have been saved before the start of this subcommand in
	     command_loop_1, if we had already been echoing then.  */
	  if (i == this_single_command_key_start)
	    before_command_echo_length = echo_length ();

827 828 829 830 831
	  c = XVECTOR (this_command_keys)->contents[i];
	  if (! (EVENT_HAS_PARAMETERS (c)
		 && EQ (EVENT_HEAD_KIND (EVENT_HEAD (c)), Qmouse_movement)))
	    echo_char (c);
	}
832 833 834 835 836 837 838 839

      /* Set before_command_echo_length to the value that would
	 have been saved before the start of this subcommand in
	 command_loop_1, if we had already been echoing then.  */
      if (this_command_key_count == this_single_command_key_start)
	before_command_echo_length = echo_length ();

      /* Put a dash at the end to invite the user to type more.  */
Jim Blandy's avatar
Jim Blandy committed
840 841 842 843
      echo_dash ();
    }

  echoing = 1;
844
  message3_nolog (current_kboard->echo_string,
845
		  SBYTES (current_kboard->echo_string),
846
		  STRING_MULTIBYTE (current_kboard->echo_string));
Jim Blandy's avatar
Jim Blandy committed
847 848
  echoing = 0;

849 850 851 852
  /* Record in what buffer we echoed, and from which kboard.  */
  echo_message_buffer = echo_area_buffer[0];
  echo_kboard = current_kboard;

Jim Blandy's avatar
Jim Blandy committed
853 854 855 856 857 858
  if (waiting_for_input && !NILP (Vquit_flag))
    quit_throw_to_read_char ();
}

/* Turn off echoing, for the start of a new command.  */

Andreas Schwab's avatar
Andreas Schwab committed
859
void
Jim Blandy's avatar
Jim Blandy committed
860 861
cancel_echoing ()
{
862 863
  current_kboard->immediate_echo = 0;
  current_kboard->echo_after_prompt = -1;
864
  current_kboard->echo_string = Qnil;
865 866 867
  ok_to_echo_at_next_pause = NULL;
  echo_kboard = NULL;
  echo_message_buffer = Qnil;
Jim Blandy's avatar
Jim Blandy committed
868 869 870 871 872 873 874
}

/* Return the length of the current echo string.  */

static int
echo_length ()
{
875
  return (STRINGP (current_kboard->echo_string)
876
	  ? SCHARS (current_kboard->echo_string)
877
	  : 0);
Jim Blandy's avatar
Jim Blandy committed
878 879 880 881
}

/* Truncate the current echo message to its first LEN chars.
   This and echo_char get used by read_key_sequence when the user
Jim Blandy's avatar
Jim Blandy committed
882
   switches frames while entering a key sequence.  */
Jim Blandy's avatar
Jim Blandy committed
883 884

static void
885 886 887 888 889 890 891 892
echo_truncate (nchars)
     int nchars;
{
  if (STRINGP (current_kboard->echo_string))
    current_kboard->echo_string
      = Fsubstring (current_kboard->echo_string,
		    make_number (0), make_number (nchars));
  truncate_echo_area (nchars);
Jim Blandy's avatar
Jim Blandy committed
893 894 895 896 897 898 899 900
}


/* Functions for manipulating this_command_keys.  */
static void
add_command_key (key)
     Lisp_Object key;
{
901 902
#if 0 /* Not needed after we made Freset_this_command_lengths
	 do the job immediately.  */
903 904 905 906 907
  /* If reset-this-command-length was called recently, obey it now.
     See the doc string of that function for an explanation of why.  */
  if (before_command_restore_flag)
    {
      this_command_key_count = before_command_key_count_1;
908 909
      if (this_command_key_count < this_single_command_key_start)
	this_single_command_key_start = this_command_key_count;
910 911 912
      echo_truncate (before_command_echo_length_1);
      before_command_restore_flag = 0;
    }
913
#endif
914

915 916 917 918
  if (this_command_key_count >= ASIZE (this_command_keys))
    this_command_keys = larger_vector (this_command_keys,
				       2 * ASIZE (this_command_keys),
				       Qnil);
919

920
  ASET (this_command_keys, this_command_key_count, key);
921
  ++this_command_key_count;
Jim Blandy's avatar
Jim Blandy committed
922
}
923

Jim Blandy's avatar
Jim Blandy committed
924 925 926 927

Lisp_Object
recursive_edit_1 ()
{
Juanma Barranquero's avatar
Juanma Barranquero committed
928
  int count = SPECPDL_INDEX ();
Jim Blandy's avatar
Jim Blandy committed
929 930 931 932 933 934 935 936
  Lisp_Object val;

  if (command_loop_level > 0)
    {
      specbind (Qstandard_output, Qt);
      specbind (Qstandard_input, Qt);
    }

937
#ifdef HAVE_WINDOW_SYSTEM
938
  /* The command loop has started an hourglass timer, so we have to
939
     cancel it here, otherwise it will fire because the recursive edit
940 941
     can take some time.  Do not check for display_hourglass_p here,
     because it could already be nil.  */
942
    cancel_hourglass ();
943 944
#endif

945 946 947 948 949 950 951 952 953 954 955 956
  /* This function may have been called from a debugger called from
     within redisplay, for instance by Edebugging a function called
     from fontification-functions.  We want to allow redisplay in
     the debugging session.

     The recursive edit is left with a `(throw exit ...)'.  The `exit'
     tag is not caught anywhere in redisplay, i.e. when we leave the
     recursive edit, the original redisplay leading to the recursive
     edit will be unwound.  The outcome should therefore be safe.  */
  specbind (Qinhibit_redisplay, Qnil);
  redisplaying_p = 0;

Jim Blandy's avatar
Jim Blandy committed
957 958 959
  val = command_loop ();
  if (EQ (val, Qt))
    Fsignal (Qquit, Qnil);
960 961 962
  /* Handle throw from read_minibuf when using minibuffer
     while it's active but we're in another window.  */
  if (STRINGP (val))
963
    xsignal1 (Qerror, val);
Jim Blandy's avatar
Jim Blandy committed
964

965
  return unbind_to (count, Qnil);
Jim Blandy's avatar
Jim Blandy committed
966 967 968
}

/* When an auto-save happens, record the "time", and don't do again soon.  */