src/terminal.c

   1 /* Functions related to terminal devices.
   2    Copyright (C) 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 #include <config.h>
  22 #include <stdio.h>
  23
  24 #include "lisp.h"
  25 #include "frame.h"
  26 #include "termchar.h"
  27 #include "termhooks.h"
  28 #include "charset.h"
  29 #include "coding.h"
  30 #include "keyboard.h"
  31
  32 /* Chain of all terminals currently in use. */
  33 struct terminal *terminal_list;
  34
  35 /* The first unallocated terminal id. */
  36 static int next_terminal_id;
  37
  38 /* The initial terminal device, created by initial_term_init. */
  39 struct terminal *initial_terminal;
  40
  41 /* Function to use to ring the bell.  */
  42 Lisp_Object Vring_bell_function;
  43
  44 static void delete_initial_terminal P_ ((struct terminal *));
  45
  46 \f
  47
  48 void
  49 ring_bell (struct frame *f)
  50 {
  51   if (!NILP (Vring_bell_function))
  52     {
  53       Lisp_Object function;
  54
  55       /* Temporarily set the global variable to nil
  56          so that if we get an error, it stays nil
  57          and we don't call it over and over.
  58
  59          We don't specbind it, because that would carefully
  60          restore the bad value if there's an error
  61          and make the loop of errors happen anyway.  */
  62
  63       function = Vring_bell_function;
  64       Vring_bell_function = Qnil;
  65
  66       call0 (function);
  67
  68       Vring_bell_function = function;
  69     }
  70   else if (FRAME_TERMINAL (f)->ring_bell_hook)
  71     (*FRAME_TERMINAL (f)->ring_bell_hook) (f);
  72 }
  73
  74 void
  75 update_begin (struct frame *f)
  76 {
  77   if (FRAME_TERMINAL (f)->update_begin_hook)
  78     (*FRAME_TERMINAL (f)->update_begin_hook) (f);
  79 }
  80
  81 void
  82 update_end (struct frame *f)
  83 {
  84   if (FRAME_TERMINAL (f)->update_end_hook)
  85     (*FRAME_TERMINAL (f)->update_end_hook) (f);
  86 }
  87
  88 /* Specify how many text lines, from the top of the window,
  89    should be affected by insert-lines and delete-lines operations.
  90    This, and those operations, are used only within an update
  91    that is bounded by calls to update_begin and update_end.  */
  92
  93 void
  94 set_terminal_window (struct frame *f, int size)
  95 {
  96   if (FRAME_TERMINAL (f)->set_terminal_window_hook)
  97     (*FRAME_TERMINAL (f)->set_terminal_window_hook) (f, size);
  98 }
  99
 100 /* Move cursor to row/column position VPOS/HPOS.  HPOS/VPOS are
 101    frame-relative coordinates.  */
 102
 103 void
 104 cursor_to (struct frame *f, int vpos, int hpos)
 105 {
 106   if (FRAME_TERMINAL (f)->cursor_to_hook)
 107     (*FRAME_TERMINAL (f)->cursor_to_hook) (f, vpos, hpos);
 108 }
 109
 110 /* Similar but don't take any account of the wasted characters.  */
 111
 112 void
 113 raw_cursor_to (struct frame *f, int row, int col)
 114 {
 115   if (FRAME_TERMINAL (f)->raw_cursor_to_hook)
 116     (*FRAME_TERMINAL (f)->raw_cursor_to_hook) (f, row, col);
 117 }
 118
 119 /* Erase operations */
 120
 121 /* Clear from cursor to end of frame. */
 122 void
 123 clear_to_end (struct frame *f)
 124 {
 125   if (FRAME_TERMINAL (f)->clear_to_end_hook)
 126     (*FRAME_TERMINAL (f)->clear_to_end_hook) (f);
 127 }
 128
 129 /* Clear entire frame */
 130
 131 void
 132 clear_frame (struct frame *f)
 133 {
 134   if (FRAME_TERMINAL (f)->clear_frame_hook)
 135     (*FRAME_TERMINAL (f)->clear_frame_hook) (f);
 136 }
 137
 138 /* Clear from cursor to end of line.
 139    Assume that the line is already clear starting at column first_unused_hpos.
 140
 141    Note that the cursor may be moved, on terminals lacking a `ce' string.  */
 142
 143 void
 144 clear_end_of_line (struct frame *f, int first_unused_hpos)
 145 {
 146   if (FRAME_TERMINAL (f)->clear_end_of_line_hook)
 147     (*FRAME_TERMINAL (f)->clear_end_of_line_hook) (f, first_unused_hpos);
 148 }
 149
 150 /* Output LEN glyphs starting at STRING at the nominal cursor position.
 151    Advance the nominal cursor over the text.  */
 152
 153 void
 154 write_glyphs (struct frame *f, struct glyph *string, int len)
 155 {
 156   if (FRAME_TERMINAL (f)->write_glyphs_hook)
 157     (*FRAME_TERMINAL (f)->write_glyphs_hook) (f, string, len);
 158 }
 159
 160 /* Insert LEN glyphs from START at the nominal cursor position.
 161
 162    If start is zero, insert blanks instead of a string at start */
 163
 164 void
 165 insert_glyphs (struct frame *f, struct glyph *start, int len)
 166 {
 167   if (len <= 0)
 168     return;
 169
 170   if (FRAME_TERMINAL (f)->insert_glyphs_hook)
 171     (*FRAME_TERMINAL (f)->insert_glyphs_hook) (f, start, len);
 172 }
 173
 174 /* Delete N glyphs at the nominal cursor position. */
 175
 176 void
 177 delete_glyphs (struct frame *f, int n)
 178 {
 179   if (FRAME_TERMINAL (f)->delete_glyphs_hook)
 180     (*FRAME_TERMINAL (f)->delete_glyphs_hook) (f, n);
 181 }
 182
 183 /* Insert N lines at vpos VPOS.  If N is negative, delete -N lines.  */
 184
 185 void
 186 ins_del_lines (struct frame *f, int vpos, int n)
 187 {
 188   if (FRAME_TERMINAL (f)->ins_del_lines_hook)
 189     (*FRAME_TERMINAL (f)->ins_del_lines_hook) (f, vpos, n);
 190 }
 191
 192
 193 \f
 194
 195 /* Return the terminal object specified by TERMINAL.  TERMINAL may be a
 196    terminal id, a frame, or nil for the terminal device of the current
 197    frame.  If THROW is zero, return NULL for failure, otherwise throw
 198    an error.  */
 199
 200 struct terminal *
 201 get_terminal (Lisp_Object terminal, int throw)
 202 {
 203   struct terminal *result = NULL;
 204
 205   if (NILP (terminal))
 206     terminal = selected_frame;
 207
 208   if (TERMINALP (terminal))
 209     result = XTERMINAL (terminal);
 210
 211   else if (FRAMEP (terminal))
 212     {
 213       result = FRAME_TERMINAL (XFRAME (terminal));
 214     }
 215
 216   if (result && !result->name)
 217     result = NULL;
 218
 219   if (result == NULL && throw)
 220     wrong_type_argument (Qterminal_live_p, terminal);
 221
 222   return result;
 223 }
 224
 225 \f
 226
 227 /* Create a new terminal object and add it to the terminal list. */
 228
 229 struct terminal *
 230 create_terminal (void)
 231 {
 232   struct terminal *terminal = allocate_terminal ();
 233
 234   terminal->name = NULL;
 235   terminal->next_terminal = terminal_list;
 236   terminal_list = terminal;
 237
 238   terminal->id = next_terminal_id++;
 239
 240   terminal->keyboard_coding =
 241     (struct coding_system *) xmalloc (sizeof (struct coding_system));
 242   terminal->terminal_coding =
 243     (struct coding_system *) xmalloc (sizeof (struct coding_system));
 244
 245   setup_coding_system (Qno_conversion, terminal->keyboard_coding);
 246   setup_coding_system (Qundecided, terminal->terminal_coding);
 247
 248   terminal->param_alist = Qnil;
 249   return terminal;
 250 }
 251
 252 /* Low-level function to close all frames on a terminal, remove it
 253    from the terminal list and free its memory.  */
 254
 255 void
 256 delete_terminal (struct terminal *terminal)
 257 {
 258   struct terminal **tp;
 259   Lisp_Object tail, frame;
 260
 261   /* Protect against recursive calls.  Fdelete_frame calls the
 262      delete_terminal_hook when we delete our last frame.  */
 263   if (!terminal->name)
 264     return;
 265   xfree (terminal->name);
 266   terminal->name = NULL;
 267
 268   /* Check for live frames that are still on this terminal. */
 269   FOR_EACH_FRAME (tail, frame)
 270     {
 271       struct frame *f = XFRAME (frame);
 272       if (FRAME_LIVE_P (f) && f->terminal == terminal)
 273         {
 274           Fdelete_frame (frame, Qt);
 275         }
 276     }
 277
 278   for (tp = &terminal_list; *tp != terminal; tp = &(*tp)->next_terminal)
 279     if (! *tp)
 280       abort ();
 281   *tp = terminal->next_terminal;
 282
 283   xfree (terminal->keyboard_coding);
 284   terminal->keyboard_coding = NULL;
 285   xfree (terminal->terminal_coding);
 286   terminal->terminal_coding = NULL;
 287
 288 #ifdef MULTI_KBOARD
 289   if (terminal->kboard && --terminal->kboard->reference_count == 0)
 290     {
 291       delete_kboard (terminal->kboard);
 292       terminal->kboard = NULL;
 293     }
 294 #endif
 295 }
 296
 297 DEFUN ("delete-terminal", Fdelete_terminal, Sdelete_terminal, 0, 2, 0,
 298        doc: /* Delete TERMINAL by deleting all frames on it and closing the terminal.
 299 TERMINAL may be a terminal id, a frame, or nil (meaning the selected
 300 frame's terminal).
 301
 302 Normally, you may not delete a display if all other displays are suspended,
 303 but if the second argument FORCE is non-nil, you may do so. */)
 304   (terminal, force)
 305      Lisp_Object terminal, force;
 306 {
 307   struct terminal *t, *p;
 308
 309   t = get_terminal (terminal, 0);
 310
 311   if (!t)
 312     return Qnil;
 313
 314   p = terminal_list;
 315   while (p && (p == t || !TERMINAL_ACTIVE_P (p)))
 316     p = p->next_terminal;
 317
 318   if (NILP (force) && !p)
 319     error ("Attempt to delete the sole active display terminal");
 320
 321   if (t->delete_terminal_hook)
 322     (*t->delete_terminal_hook) (t);
 323   else
 324     delete_terminal (t);
 325
 326   return Qnil;
 327 }
 328
 329 \f
 330 DEFUN ("frame-terminal", Fframe_terminal, Sframe_terminal, 0, 1, 0,
 331        doc: /* Return the terminal that FRAME is displayed on.
 332 If FRAME is nil, the selected frame is used.
 333
 334 The terminal device is represented by its integer identifier.  */)
 335   (frame)
 336      Lisp_Object frame;
 337 {
 338   struct terminal *t;
 339
 340   if (NILP (frame))
 341     frame = selected_frame;
 342
 343   CHECK_LIVE_FRAME (frame);
 344
 345   t = FRAME_TERMINAL (XFRAME (frame));
 346
 347   if (!t)
 348     return Qnil;
 349   else
 350     {
 351       Lisp_Object terminal;
 352       XSETTERMINAL (terminal, t);
 353       return terminal;
 354     }
 355 }
 356
 357 DEFUN ("terminal-live-p", Fterminal_live_p, Sterminal_live_p, 1, 1, 0,
 358        doc: /* Return non-nil if OBJECT is a terminal which has not been deleted.
 359 Value is nil if OBJECT is not a live display terminal.
 360 If object is a live display terminal, the return value indicates what
 361 sort of output terminal it uses.  See the documentation of `framep' for
 362 possible return values.  */)
 363      (object)
 364      Lisp_Object object;
 365 {
 366   struct terminal *t;
 367
 368   t = get_terminal (object, 0);
 369
 370   if (!t)
 371     return Qnil;
 372
 373   switch (t->type)
 374     {
 375     case output_initial: /* The initial frame is like a termcap frame. */
 376     case output_termcap:
 377       return Qt;
 378     case output_x_window:
 379       return Qx;
 380     case output_w32:
 381       return Qw32;
 382     case output_msdos_raw:
 383       return Qpc;
 384     case output_mac:
 385       return Qmac;
 386     default:
 387       abort ();
 388     }
 389 }
 390
 391 DEFUN ("terminal-list", Fterminal_list, Sterminal_list, 0, 0, 0,
 392        doc: /* Return a list of all terminal devices.  */)
 393   ()
 394 {
 395   Lisp_Object terminal, terminals = Qnil;
 396   struct terminal *t;
 397
 398   for (t = terminal_list; t; t = t->next_terminal)
 399     {
 400       XSETTERMINAL (terminal, t);
 401       terminals = Fcons (terminal, terminals);
 402     }
 403
 404   return terminals;
 405 }
 406
 407 DEFUN ("terminal-name", Fterminal_name, Sterminal_name, 0, 1, 0,
 408        doc: /* Return the name of the terminal device TERMINAL.
 409 It is not guaranteed that the returned value is unique among opened devices.
 410
 411 TERMINAL may be a terminal id, a frame, or nil (meaning the
 412 selected frame's terminal). */)
 413   (terminal)
 414      Lisp_Object terminal;
 415 {
 416   struct terminal *t
 417     = TERMINALP (terminal) ? XTERMINAL (terminal) : get_terminal (terminal, 1);
 418
 419   return t->name ? build_string (t->name) : Qnil;
 420 }
 421
 422
 423 \f
 424 /* Return the value of terminal parameter PARAM in terminal T.  */
 425 Lisp_Object
 426 get_terminal_param (t, param)
 427      struct terminal *t;
 428      Lisp_Object param;
 429 {
 430   Lisp_Object tem = Fassq (param, t->param_alist);
 431   if (EQ (tem, Qnil))
 432     return tem;
 433   return Fcdr (tem);
 434 }
 435
 436 /* Set the value of terminal parameter PARAMETER in terminal D to VALUE.
 437    Return the previous value.  */
 438
 439 Lisp_Object
 440 store_terminal_param (t, parameter, value)
 441      struct terminal *t;
 442      Lisp_Object parameter;
 443      Lisp_Object value;
 444 {
 445   Lisp_Object old_alist_elt = Fassq (parameter, t->param_alist);
 446   if (EQ (old_alist_elt, Qnil))
 447     {
 448       t->param_alist = Fcons (Fcons (parameter, value), t->param_alist);
 449       return Qnil;
 450     }
 451   else
 452     {
 453       Lisp_Object result = Fcdr (old_alist_elt);
 454       Fsetcdr (old_alist_elt, value);
 455       return result;
 456     }
 457 }
 458
 459
 460 DEFUN ("terminal-parameters", Fterminal_parameters, Sterminal_parameters, 0, 1, 0,
 461        doc: /* Return the parameter-alist of terminal TERMINAL.
 462 The value is a list of elements of the form (PARM . VALUE), where PARM
 463 is a symbol.
 464
 465 TERMINAL can be a terminal id, a frame or nil (meaning the selected
 466 frame's terminal).  */)
 467      (terminal)
 468      Lisp_Object terminal;
 469 {
 470   struct terminal *t
 471     = TERMINALP (terminal) ? XTERMINAL (terminal) : get_terminal (terminal, 1);
 472   return Fcopy_alist (t->param_alist);
 473 }
 474
 475 DEFUN ("terminal-parameter", Fterminal_parameter, Sterminal_parameter, 2, 2, 0,
 476        doc: /* Return TERMINAL's value for parameter PARAMETER.
 477 TERMINAL can be a terminal id, a frame or nil (meaning the selected
 478 frame's terminal).  */)
 479      (terminal, parameter)
 480      Lisp_Object terminal;
 481      Lisp_Object parameter;
 482 {
 483   Lisp_Object value;
 484   struct terminal *t
 485     = TERMINALP (terminal) ? XTERMINAL (terminal) : get_terminal (terminal, 1);
 486   CHECK_SYMBOL (parameter);
 487   value = Fcdr (Fassq (parameter, t->param_alist));
 488   return value;
 489 }
 490
 491 DEFUN ("set-terminal-parameter", Fset_terminal_parameter,
 492        Sset_terminal_parameter, 3, 3, 0,
 493        doc: /* Set TERMINAL's value for parameter PARAMETER to VALUE.
 494 Return the previous value of PARAMETER.
 495
 496 TERMINAL can be a terminal id, a frame or nil (meaning the selected
 497 frame's terminal).  */)
 498      (terminal, parameter, value)
 499      Lisp_Object terminal;
 500      Lisp_Object parameter;
 501      Lisp_Object value;
 502 {
 503   struct terminal *t
 504     = TERMINALP (terminal) ? XTERMINAL (terminal) : get_terminal (terminal, 1);
 505   return store_terminal_param (t, parameter, value);
 506 }
 507
 508 \f
 509
 510 /* Create the bootstrap display terminal for the initial frame.
 511    Returns a terminal of type output_initial.  */
 512
 513 struct terminal *
 514 init_initial_terminal (void)
 515 {
 516   if (initialized || terminal_list || tty_list)
 517     abort ();
 518
 519   initial_terminal = create_terminal ();
 520   initial_terminal->type = output_initial;
 521   initial_terminal->name = xstrdup ("initial_terminal");
 522 #ifdef MULTI_KBOARD
 523   initial_terminal->kboard = initial_kboard;
 524 #endif
 525   initial_terminal->delete_terminal_hook = &delete_initial_terminal;
 526   /* All other hooks are NULL. */
 527
 528   return initial_terminal;
 529 }
 530
 531 /* Deletes the bootstrap terminal device.
 532    Called through delete_terminal_hook. */
 533
 534 static void
 535 delete_initial_terminal (struct terminal *terminal)
 536 {
 537   if (terminal != initial_terminal)
 538     abort ();
 539
 540   delete_terminal (terminal);
 541   initial_terminal = NULL;
 542 }
 543
 544 void
 545 syms_of_terminal ()
 546 {
 547
 548   DEFVAR_LISP ("ring-bell-function", &Vring_bell_function,
 549     doc: /* Non-nil means call this function to ring the bell.
 550 The function should accept no arguments.  */);
 551   Vring_bell_function = Qnil;
 552
 553   defsubr (&Sdelete_terminal);
 554   defsubr (&Sframe_terminal);
 555   defsubr (&Sterminal_live_p);
 556   defsubr (&Sterminal_list);
 557   defsubr (&Sterminal_name);
 558   defsubr (&Sterminal_parameters);
 559   defsubr (&Sterminal_parameter);
 560   defsubr (&Sset_terminal_parameter);
 561
 562   Fprovide (intern ("multi-tty"), Qnil);
 563 }
 564
 565 /* arch-tag: e9af6f27-b483-47dc-bb1a-730c1c5cab03
 566    (do not change this comment) */