Source

emacs / src / terminal.c

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
/* Functions related to terminal devices.
   Copyright (C) 2005-2011 Free Software Foundation, Inc.

This file is part of GNU Emacs.

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

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
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>
#include <stdio.h>
#include <setjmp.h>

#include "lisp.h"
#include "frame.h"
#include "termchar.h"
#include "termhooks.h"
#include "charset.h"
#include "coding.h"
#include "keyboard.h"

/* Chain of all terminals currently in use. */
struct terminal *terminal_list;

/* The first unallocated terminal id. */
static int next_terminal_id;

/* The initial terminal device, created by initial_term_init. */
struct terminal *initial_terminal;

static void delete_initial_terminal (struct terminal *);



void
ring_bell (struct frame *f)
{
  if (!NILP (Vring_bell_function))
    {
      Lisp_Object function;

      /* Temporarily set the global variable to nil
	 so that if we get an error, it stays nil
	 and we don't call it over and over.

	 We don't specbind it, because that would carefully
	 restore the bad value if there's an error
	 and make the loop of errors happen anyway.  */

      function = Vring_bell_function;
      Vring_bell_function = Qnil;

      call0 (function);

      Vring_bell_function = function;
    }
  else if (FRAME_TERMINAL (f)->ring_bell_hook)
    (*FRAME_TERMINAL (f)->ring_bell_hook) (f);
}

void
update_begin (struct frame *f)
{
  if (FRAME_TERMINAL (f)->update_begin_hook)
    (*FRAME_TERMINAL (f)->update_begin_hook) (f);
}

void
update_end (struct frame *f)
{
  if (FRAME_TERMINAL (f)->update_end_hook)
    (*FRAME_TERMINAL (f)->update_end_hook) (f);
}

/* Specify how many text lines, from the top of the window,
   should be affected by insert-lines and delete-lines operations.
   This, and those operations, are used only within an update
   that is bounded by calls to update_begin and update_end.  */

void
set_terminal_window (struct frame *f, int size)
{
  if (FRAME_TERMINAL (f)->set_terminal_window_hook)
    (*FRAME_TERMINAL (f)->set_terminal_window_hook) (f, size);
}

/* Move cursor to row/column position VPOS/HPOS.  HPOS/VPOS are
   frame-relative coordinates.  */

void
cursor_to (struct frame *f, int vpos, int hpos)
{
  if (FRAME_TERMINAL (f)->cursor_to_hook)
    (*FRAME_TERMINAL (f)->cursor_to_hook) (f, vpos, hpos);
}

/* Similar but don't take any account of the wasted characters.  */

void
raw_cursor_to (struct frame *f, int row, int col)
{
  if (FRAME_TERMINAL (f)->raw_cursor_to_hook)
    (*FRAME_TERMINAL (f)->raw_cursor_to_hook) (f, row, col);
}

/* Erase operations */

/* Clear from cursor to end of frame. */
void
clear_to_end (struct frame *f)
{
  if (FRAME_TERMINAL (f)->clear_to_end_hook)
    (*FRAME_TERMINAL (f)->clear_to_end_hook) (f);
}

/* Clear entire frame */

void
clear_frame (struct frame *f)
{
  if (FRAME_TERMINAL (f)->clear_frame_hook)
    (*FRAME_TERMINAL (f)->clear_frame_hook) (f);
}

/* Clear from cursor to end of line.
   Assume that the line is already clear starting at column first_unused_hpos.

   Note that the cursor may be moved, on terminals lacking a `ce' string.  */

void
clear_end_of_line (struct frame *f, int first_unused_hpos)
{
  if (FRAME_TERMINAL (f)->clear_end_of_line_hook)
    (*FRAME_TERMINAL (f)->clear_end_of_line_hook) (f, first_unused_hpos);
}

/* Output LEN glyphs starting at STRING at the nominal cursor position.
   Advance the nominal cursor over the text.  */

void
write_glyphs (struct frame *f, struct glyph *string, int len)
{
  if (FRAME_TERMINAL (f)->write_glyphs_hook)
    (*FRAME_TERMINAL (f)->write_glyphs_hook) (f, string, len);
}

/* Insert LEN glyphs from START at the nominal cursor position.

   If start is zero, insert blanks instead of a string at start */

void
insert_glyphs (struct frame *f, struct glyph *start, int len)
{
  if (len <= 0)
    return;

  if (FRAME_TERMINAL (f)->insert_glyphs_hook)
    (*FRAME_TERMINAL (f)->insert_glyphs_hook) (f, start, len);
}

/* Delete N glyphs at the nominal cursor position. */

void
delete_glyphs (struct frame *f, int n)
{
  if (FRAME_TERMINAL (f)->delete_glyphs_hook)
    (*FRAME_TERMINAL (f)->delete_glyphs_hook) (f, n);
}

/* Insert N lines at vpos VPOS.  If N is negative, delete -N lines.  */

void
ins_del_lines (struct frame *f, int vpos, int n)
{
  if (FRAME_TERMINAL (f)->ins_del_lines_hook)
    (*FRAME_TERMINAL (f)->ins_del_lines_hook) (f, vpos, n);
}




/* Return the terminal object specified by TERMINAL.  TERMINAL may be
   a terminal object, a frame, or nil for the terminal device of the
   current frame.  If THROW is zero, return NULL for failure,
   otherwise throw an error.  */

struct terminal *
get_terminal (Lisp_Object terminal, int throw)
{
  struct terminal *result = NULL;

  if (NILP (terminal))
    terminal = selected_frame;

  if (TERMINALP (terminal))
    result = XTERMINAL (terminal);
  else if (FRAMEP (terminal))
    result = FRAME_TERMINAL (XFRAME (terminal));

  if (result && !result->name)
    result = NULL;

  if (result == NULL && throw)
    wrong_type_argument (Qterminal_live_p, terminal);

  return result;
}



/* Create a new terminal object and add it to the terminal list. */

struct terminal *
create_terminal (void)
{
  struct terminal *terminal = allocate_terminal ();
  Lisp_Object terminal_coding, keyboard_coding;

  terminal->name = NULL;
  terminal->next_terminal = terminal_list;
  terminal_list = terminal;

  terminal->id = next_terminal_id++;

  terminal->keyboard_coding =
    (struct coding_system *) xmalloc (sizeof (struct coding_system));
  terminal->terminal_coding =
    (struct coding_system *) xmalloc (sizeof (struct coding_system));

  /* If default coding systems for the terminal and the keyboard are
     already defined, use them in preference to the defaults.  This is
     needed when Emacs runs in daemon mode.  */
  keyboard_coding =
    find_symbol_value (intern ("default-keyboard-coding-system"));
  if (NILP (keyboard_coding)
      || EQ (keyboard_coding, Qunbound)
      || NILP (Fcoding_system_p (keyboard_coding)))
    keyboard_coding = Qno_conversion;
  terminal_coding =
    find_symbol_value (intern ("default-terminal-coding-system"));
  if (NILP (terminal_coding)
      || EQ (terminal_coding, Qunbound)
      || NILP (Fcoding_system_p (terminal_coding)))
    terminal_coding = Qundecided;

  setup_coding_system (keyboard_coding, terminal->keyboard_coding);
  setup_coding_system (terminal_coding, terminal->terminal_coding);

  terminal->param_alist = Qnil;
  terminal->charset_list = Qnil;
  terminal->Vselection_alist = Qnil;
  return terminal;
}

/* Low-level function to close all frames on a terminal, remove it
   from the terminal list and free its memory.  */

void
delete_terminal (struct terminal *terminal)
{
  struct terminal **tp;
  Lisp_Object tail, frame;

  /* Protect against recursive calls.  delete_frame calls the
     delete_terminal_hook when we delete our last frame.  */
  if (!terminal->name)
    return;
  xfree (terminal->name);
  terminal->name = NULL;

  /* Check for live frames that are still on this terminal. */
  FOR_EACH_FRAME (tail, frame)
    {
      struct frame *f = XFRAME (frame);
      if (FRAME_LIVE_P (f) && f->terminal == terminal)
        {
	  /* Pass Qnoelisp rather than Qt.  */
          delete_frame (frame, Qnoelisp);
        }
    }

  for (tp = &terminal_list; *tp != terminal; tp = &(*tp)->next_terminal)
    if (! *tp)
      abort ();
  *tp = terminal->next_terminal;

  xfree (terminal->keyboard_coding);
  terminal->keyboard_coding = NULL;
  xfree (terminal->terminal_coding);
  terminal->terminal_coding = NULL;

  if (terminal->kboard && --terminal->kboard->reference_count == 0)
    {
      delete_kboard (terminal->kboard);
      terminal->kboard = NULL;
    }
}

Lisp_Object Qrun_hook_with_args;
static Lisp_Object Qdelete_terminal_functions;
DEFUN ("delete-terminal", Fdelete_terminal, Sdelete_terminal, 0, 2, 0,
       doc: /* Delete TERMINAL by deleting all frames on it and closing the terminal.
TERMINAL may be a terminal object, a frame, or nil (meaning the
selected frame's terminal).

Normally, you may not delete a display if all other displays are suspended,
but if the second argument FORCE is non-nil, you may do so. */)
  (Lisp_Object terminal, Lisp_Object force)
{
  struct terminal *t = get_terminal (terminal, 0);

  if (!t)
    return Qnil;

  if (NILP (force))
    {
      struct terminal *p = terminal_list;
      while (p && (p == t || !TERMINAL_ACTIVE_P (p)))
	p = p->next_terminal;

      if (!p)
	error ("Attempt to delete the sole active display terminal");
    }

  if (NILP (Vrun_hooks))
    ;
  else if (EQ (force, Qnoelisp))
    pending_funcalls
      = Fcons (list3 (Qrun_hook_with_args,
		      Qdelete_terminal_functions, terminal),
	       pending_funcalls);
  else
    safe_call2 (Qrun_hook_with_args, Qdelete_terminal_functions, terminal);

  if (t->delete_terminal_hook)
    (*t->delete_terminal_hook) (t);
  else
    delete_terminal (t);

  return Qnil;
}


DEFUN ("frame-terminal", Fframe_terminal, Sframe_terminal, 0, 1, 0,
       doc: /* Return the terminal that FRAME is displayed on.
If FRAME is nil, the selected frame is used.

The terminal device is represented by its integer identifier.  */)
  (Lisp_Object frame)
{
  struct terminal *t;

  if (NILP (frame))
    frame = selected_frame;

  CHECK_LIVE_FRAME (frame);

  t = FRAME_TERMINAL (XFRAME (frame));

  if (!t)
    return Qnil;
  else
    {
      Lisp_Object terminal;
      XSETTERMINAL (terminal, t);
      return terminal;
    }
}

DEFUN ("terminal-live-p", Fterminal_live_p, Sterminal_live_p, 1, 1, 0,
       doc: /* Return non-nil if OBJECT is a terminal which has not been deleted.
Value is nil if OBJECT is not a live display terminal.
If object is a live display terminal, the return value indicates what
sort of output terminal it uses.  See the documentation of `framep' for
possible return values.  */)
  (Lisp_Object object)
{
  struct terminal *t;

  t = get_terminal (object, 0);

  if (!t)
    return Qnil;

  switch (t->type)
    {
    case output_initial: /* The initial frame is like a termcap frame. */
    case output_termcap:
      return Qt;
    case output_x_window:
      return Qx;
    case output_w32:
      return Qw32;
    case output_msdos_raw:
      return Qpc;
    case output_mac:
      return Qmac;
    case output_ns:
      return Qns;
    default:
      abort ();
    }
}

DEFUN ("terminal-list", Fterminal_list, Sterminal_list, 0, 0, 0,
       doc: /* Return a list of all terminal devices.  */)
  (void)
{
  Lisp_Object terminal, terminals = Qnil;
  struct terminal *t;

  for (t = terminal_list; t; t = t->next_terminal)
    {
      XSETTERMINAL (terminal, t);
      terminals = Fcons (terminal, terminals);
    }

  return terminals;
}

DEFUN ("terminal-name", Fterminal_name, Sterminal_name, 0, 1, 0,
       doc: /* Return the name of the terminal device TERMINAL.
It is not guaranteed that the returned value is unique among opened devices.

TERMINAL may be a terminal object, a frame, or nil (meaning the
selected frame's terminal). */)
  (Lisp_Object terminal)
{
  struct terminal *t
    = TERMINALP (terminal) ? XTERMINAL (terminal) : get_terminal (terminal, 1);

  return t->name ? build_string (t->name) : Qnil;
}



/* Set the value of terminal parameter PARAMETER in terminal D to VALUE.
   Return the previous value.  */

static Lisp_Object
store_terminal_param (struct terminal *t, Lisp_Object parameter, Lisp_Object value)
{
  Lisp_Object old_alist_elt = Fassq (parameter, t->param_alist);
  if (EQ (old_alist_elt, Qnil))
    {
      t->param_alist = Fcons (Fcons (parameter, value), t->param_alist);
      return Qnil;
    }
  else
    {
      Lisp_Object result = Fcdr (old_alist_elt);
      Fsetcdr (old_alist_elt, value);
      return result;
    }
}


DEFUN ("terminal-parameters", Fterminal_parameters, Sterminal_parameters, 0, 1, 0,
       doc: /* Return the parameter-alist of terminal TERMINAL.
The value is a list of elements of the form (PARM . VALUE), where PARM
is a symbol.

TERMINAL can be a terminal object, a frame, or nil (meaning the
selected frame's terminal).  */)
  (Lisp_Object terminal)
{
  struct terminal *t
    = TERMINALP (terminal) ? XTERMINAL (terminal) : get_terminal (terminal, 1);
  return Fcopy_alist (t->param_alist);
}

DEFUN ("terminal-parameter", Fterminal_parameter, Sterminal_parameter, 2, 2, 0,
       doc: /* Return TERMINAL's value for parameter PARAMETER.
TERMINAL can be a terminal object, a frame, or nil (meaning the
selected frame's terminal).  */)
  (Lisp_Object terminal, Lisp_Object parameter)
{
  Lisp_Object value;
  struct terminal *t
    = TERMINALP (terminal) ? XTERMINAL (terminal) : get_terminal (terminal, 1);
  CHECK_SYMBOL (parameter);
  value = Fcdr (Fassq (parameter, t->param_alist));
  return value;
}

DEFUN ("set-terminal-parameter", Fset_terminal_parameter,
       Sset_terminal_parameter, 3, 3, 0,
       doc: /* Set TERMINAL's value for parameter PARAMETER to VALUE.
Return the previous value of PARAMETER.

TERMINAL can be a terminal object, a frame or nil (meaning the
selected frame's terminal).  */)
  (Lisp_Object terminal, Lisp_Object parameter, Lisp_Object value)
{
  struct terminal *t
    = TERMINALP (terminal) ? XTERMINAL (terminal) : get_terminal (terminal, 1);
  return store_terminal_param (t, parameter, value);
}



/* Create the bootstrap display terminal for the initial frame.
   Returns a terminal of type output_initial.  */

struct terminal *
init_initial_terminal (void)
{
  if (initialized || terminal_list || tty_list)
    abort ();

  initial_terminal = create_terminal ();
  initial_terminal->type = output_initial;
  initial_terminal->name = xstrdup ("initial_terminal");
  initial_terminal->kboard = initial_kboard;
  initial_terminal->delete_terminal_hook = &delete_initial_terminal;
  /* All other hooks are NULL. */

  return initial_terminal;
}

/* Deletes the bootstrap terminal device.
   Called through delete_terminal_hook. */

static void
delete_initial_terminal (struct terminal *terminal)
{
  if (terminal != initial_terminal)
    abort ();

  delete_terminal (terminal);
  initial_terminal = NULL;
}

void
syms_of_terminal (void)
{

  DEFVAR_LISP ("ring-bell-function", Vring_bell_function,
    doc: /* Non-nil means call this function to ring the bell.
The function should accept no arguments.  */);
  Vring_bell_function = Qnil;

  DEFVAR_LISP ("delete-terminal-functions", Vdelete_terminal_functions,
    doc: /* Special hook run when a terminal is deleted.
Each function is called with argument, the terminal.
This may be called just before actually deleting the terminal,
or some time later.  */);
  Vdelete_terminal_functions = Qnil;
  DEFSYM (Qdelete_terminal_functions, "delete-terminal-functions");
  DEFSYM (Qrun_hook_with_args, "run-hook-with-args");

  defsubr (&Sdelete_terminal);
  defsubr (&Sframe_terminal);
  defsubr (&Sterminal_live_p);
  defsubr (&Sterminal_list);
  defsubr (&Sterminal_name);
  defsubr (&Sterminal_parameters);
  defsubr (&Sterminal_parameter);
  defsubr (&Sset_terminal_parameter);

  Fprovide (intern_c_string ("multi-tty"), Qnil);
}