buffer.c 199 KB
Newer Older
Roland McGrath's avatar
Roland McGrath committed
1
/* Buffer manipulation primitives for GNU Emacs.
2

3
Copyright (C) 1985-1989, 1993-1995, 1997-2011  Free Software Foundation, Inc.
Roland McGrath's avatar
Roland McGrath committed
4 5 6

This file is part of GNU Emacs.

7
GNU Emacs is free software: you can redistribute it and/or modify
Roland McGrath's avatar
Roland McGrath committed
8
it under the terms of the GNU General Public License as published by
9 10
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Roland McGrath's avatar
Roland McGrath committed
11 12 13 14 15 16 17

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
18
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
Roland McGrath's avatar
Roland McGrath committed
19

20
#include <config.h>
Roland McGrath's avatar
Roland McGrath committed
21

22 23
#include <sys/types.h>
#include <sys/stat.h>
Roland McGrath's avatar
Roland McGrath committed
24
#include <sys/param.h>
Richard M. Stallman's avatar
Richard M. Stallman committed
25
#include <errno.h>
Dave Love's avatar
Dave Love committed
26
#include <stdio.h>
27
#include <setjmp.h>
Andreas Schwab's avatar
Andreas Schwab committed
28
#include <unistd.h>
29

Roland McGrath's avatar
Roland McGrath committed
30
#include "lisp.h"
31
#include "intervals.h"
Roland McGrath's avatar
Roland McGrath committed
32 33 34
#include "window.h"
#include "commands.h"
#include "buffer.h"
35
#include "character.h"
36
#include "region-cache.h"
Roland McGrath's avatar
Roland McGrath committed
37
#include "indent.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
38
#include "blockinput.h"
39
#include "keyboard.h"
Stefan Monnier's avatar
Stefan Monnier committed
40
#include "keymap.h"
41
#include "frame.h"
Roland McGrath's avatar
Roland McGrath committed
42 43 44 45

struct buffer *current_buffer;		/* the current buffer */

/* First buffer in chain of all buffers (in reverse order of creation).
46
   Threaded through ->header.next.buffer.  */
Roland McGrath's avatar
Roland McGrath committed
47 48 49 50 51 52 53 54 55 56

struct buffer *all_buffers;

/* This structure holds the default values of the buffer-local variables
   defined with DEFVAR_PER_BUFFER, that have special slots in each buffer.
   The default value occupies the same slot in this structure
   as an individual buffer's value occupies in that buffer.
   Setting the default value also goes through the alist of buffers
   and stores into each buffer that does not say it has a local value.  */

Kenichi Handa's avatar
Kenichi Handa committed
57
DECL_ALIGN (struct buffer, buffer_defaults);
Roland McGrath's avatar
Roland McGrath committed
58 59 60 61 62 63 64 65 66 67 68

/* A Lisp_Object pointer to the above, used for staticpro */

static Lisp_Object Vbuffer_defaults;

/* This structure marks which slots in a buffer have corresponding
   default values in buffer_defaults.
   Each such slot has a nonzero value in this structure.
   The value has only one nonzero bit.

   When a buffer has its own local value for a slot,
69 70
   the entry for that slot (found in the same slot in this structure)
   is turned on in the buffer's local_flags array.
Roland McGrath's avatar
Roland McGrath committed
71 72 73 74 75 76 77 78 79 80 81 82 83

   If a slot in this structure is -1, then even though there may
   be a DEFVAR_PER_BUFFER for the slot, there is no default value for it;
   and the corresponding slot in buffer_defaults is not used.

   If a slot in this structure corresponding to a DEFVAR_PER_BUFFER is
   zero, that is a bug */

struct buffer buffer_local_flags;

/* This structure holds the names of symbols whose values may be
   buffer-local.  It is indexed and accessed in the same way as the above. */

Kenichi Handa's avatar
Kenichi Handa committed
84 85
DECL_ALIGN (struct buffer, buffer_local_symbols);

Roland McGrath's avatar
Roland McGrath committed
86 87 88
/* A Lisp_Object pointer to the above, used for staticpro */
static Lisp_Object Vbuffer_local_symbols;

89 90 91 92 93 94
/* Return the symbol of the per-buffer variable at offset OFFSET in
   the buffer structure.  */

#define PER_BUFFER_SYMBOL(OFFSET) \
      (*(Lisp_Object *)((OFFSET) + (char *) &buffer_local_symbols))

95 96
/* Flags indicating which built-in buffer-local variables
   are permanent locals.  */
97
static char buffer_permanent_local_flags[MAX_PER_BUFFER_VARS];
98 99 100

/* Number of per-buffer variables used.  */

101
int last_per_buffer_idx;
102

103 104
static Lisp_Object Fset_buffer_major_mode (Lisp_Object);
static Lisp_Object Fdelete_overlay (Lisp_Object);
105 106 107 108 109
static void call_overlay_mod_hooks (Lisp_Object list, Lisp_Object overlay,
                                    int after, Lisp_Object arg1,
                                    Lisp_Object arg2, Lisp_Object arg3);
static void swap_out_buffer_local_variables (struct buffer *b);
static void reset_buffer_local_variables (struct buffer *b, int permanent_too);
Roland McGrath's avatar
Roland McGrath committed
110 111 112 113 114 115

/* Alist of all buffer names vs the buffers. */
/* This used to be a variable, but is no longer,
 to prevent lossage due to user rplac'ing this alist or its elements.  */
Lisp_Object Vbuffer_alist;

116
static Lisp_Object Qkill_buffer_query_functions;
117

118
/* Hook run before changing a major mode.  */
119
static Lisp_Object Qchange_major_mode_hook;
120

Jim Blandy's avatar
Jim Blandy committed
121
Lisp_Object Qfirst_change_hook;
122 123
Lisp_Object Qbefore_change_functions;
Lisp_Object Qafter_change_functions;
124
static Lisp_Object Qucs_set_table_for_input;
Roland McGrath's avatar
Roland McGrath committed
125

126 127
static Lisp_Object Qfundamental_mode, Qmode_class, Qpermanent_local;
static Lisp_Object Qpermanent_local_hook;
Roland McGrath's avatar
Roland McGrath committed
128

129
static Lisp_Object Qprotected_field;
Roland McGrath's avatar
Roland McGrath committed
130

131
static Lisp_Object QSFundamental;	/* A string "Fundamental" */
Roland McGrath's avatar
Roland McGrath committed
132

133
static Lisp_Object Qkill_buffer_hook;
Roland McGrath's avatar
Roland McGrath committed
134

135
static Lisp_Object Qget_file_buffer;
Richard M. Stallman's avatar
Richard M. Stallman committed
136

137
static Lisp_Object Qoverlayp;
Jim Blandy's avatar
Jim Blandy committed
138

139 140
Lisp_Object Qpriority, Qbefore_string, Qafter_string;
static Lisp_Object Qevaporate;
141

142 143 144 145
Lisp_Object Qmodification_hooks;
Lisp_Object Qinsert_in_front_hooks;
Lisp_Object Qinsert_behind_hooks;

146 147 148 149 150
static void alloc_buffer_text (struct buffer *, size_t);
static void free_buffer_text (struct buffer *b);
static struct Lisp_Overlay * copy_overlays (struct buffer *, struct Lisp_Overlay *);
static void modify_overlay (struct buffer *, EMACS_INT, EMACS_INT);
static Lisp_Object buffer_lisp_local_variables (struct buffer *);
151

Roland McGrath's avatar
Roland McGrath committed
152 153 154
/* For debugging; temporary.  See set_buffer_internal.  */
/* Lisp_Object Qlisp_mode, Vcheck_symbol; */

155
void
156
nsberror (Lisp_Object spec)
Roland McGrath's avatar
Roland McGrath committed
157
{
158
  if (STRINGP (spec))
159
    error ("No buffer named %s", SDATA (spec));
Roland McGrath's avatar
Roland McGrath committed
160 161 162
  error ("Invalid buffer argument");
}

Paul Eggert's avatar
Paul Eggert committed
163
DEFUN ("buffer-live-p", Fbuffer_live_p, Sbuffer_live_p, 1, 1, 0,
164 165
       doc: /* Return non-nil if OBJECT is a buffer which has not been killed.
Value is nil if OBJECT is not a buffer or if it has been killed.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
166
  (Lisp_Object object)
167
{
Tom Tromey's avatar
Tom Tromey committed
168
  return ((BUFFERP (object) && ! NILP (BVAR (XBUFFER (object), name)))
169 170 171
	  ? Qt : Qnil);
}

172
DEFUN ("buffer-list", Fbuffer_list, Sbuffer_list, 0, 1, 0,
173
       doc: /* Return a list of all existing live buffers.
Richard M. Stallman's avatar
Richard M. Stallman committed
174 175 176
If the optional arg FRAME is a frame, we return the buffer list
in the proper order for that frame: the buffers in FRAME's `buffer-list'
frame parameter come first, followed by the rest of the buffers.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
177
  (Lisp_Object frame)
Roland McGrath's avatar
Roland McGrath committed
178
{
179
  Lisp_Object general;
180 181 182 183
  general = Fmapcar (Qcdr, Vbuffer_alist);

  if (FRAMEP (frame))
    {
184 185
      Lisp_Object framelist, prevlist, tail;
      Lisp_Object args[3];
186

187
      CHECK_FRAME (frame);
188 189

      framelist = Fcopy_sequence (XFRAME (frame)->buffer_list);
190
      prevlist = Fnreverse (Fcopy_sequence (XFRAME (frame)->buried_buffer_list));
191

192 193
      /* Remove from GENERAL any buffer that duplicates one in
         FRAMELIST or PREVLIST.  */
194
      tail = framelist;
195
      while (CONSP (tail))
196
	{
197 198
	  general = Fdelq (XCAR (tail), general);
	  tail = XCDR (tail);
199
	}
200 201 202 203 204 205 206 207 208 209 210
      tail = prevlist;
      while (CONSP (tail))
	{
	  general = Fdelq (XCAR (tail), general);
	  tail = XCDR (tail);
	}

      args[0] = framelist;
      args[1] = general;
      args[2] = prevlist;
      return Fnconc (3, args);
211 212 213
    }

  return general;
Roland McGrath's avatar
Roland McGrath committed
214 215
}

216 217 218 219 220
/* Like Fassoc, but use Fstring_equal to compare
   (which ignores text properties),
   and don't ever QUIT.  */

static Lisp_Object
221
assoc_ignore_text_properties (register Lisp_Object key, Lisp_Object list)
222 223
{
  register Lisp_Object tail;
224
  for (tail = list; CONSP (tail); tail = XCDR (tail))
225 226
    {
      register Lisp_Object elt, tem;
227
      elt = XCAR (tail);
228 229 230 231 232 233 234
      tem = Fstring_equal (Fcar (elt), key);
      if (!NILP (tem))
	return elt;
    }
  return Qnil;
}

Paul Eggert's avatar
Paul Eggert committed
235
DEFUN ("get-buffer", Fget_buffer, Sget_buffer, 1, 1, 0,
236 237 238 239
       doc: /* Return the buffer named BUFFER-OR-NAME.
BUFFER-OR-NAME must be either a string or a buffer.  If BUFFER-OR-NAME
is a string and there is no buffer with that name, return nil.  If
BUFFER-OR-NAME is a buffer, return it as given.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
240
  (register Lisp_Object buffer_or_name)
Roland McGrath's avatar
Roland McGrath committed
241
{
242 243 244
  if (BUFFERP (buffer_or_name))
    return buffer_or_name;
  CHECK_STRING (buffer_or_name);
Roland McGrath's avatar
Roland McGrath committed
245

246
  return Fcdr (assoc_ignore_text_properties (buffer_or_name, Vbuffer_alist));
Roland McGrath's avatar
Roland McGrath committed
247 248 249
}

DEFUN ("get-file-buffer", Fget_file_buffer, Sget_file_buffer, 1, 1, 0,
250
       doc: /* Return the buffer visiting file FILENAME (a string).
Pavel Janík's avatar
Pavel Janík committed
251 252
The buffer's `buffer-file-name' must match exactly the expansion of FILENAME.
If there is no such live buffer, return nil.
253
See also `find-buffer-visiting'.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
254
  (register Lisp_Object filename)
Roland McGrath's avatar
Roland McGrath committed
255 256
{
  register Lisp_Object tail, buf, tem;
Richard M. Stallman's avatar
Richard M. Stallman committed
257 258
  Lisp_Object handler;

259
  CHECK_STRING (filename);
Roland McGrath's avatar
Roland McGrath committed
260 261
  filename = Fexpand_file_name (filename, Qnil);

Richard M. Stallman's avatar
Richard M. Stallman committed
262 263
  /* If the file name has special constructs in it,
     call the corresponding file handler.  */
264
  handler = Ffind_file_name_handler (filename, Qget_file_buffer);
Richard M. Stallman's avatar
Richard M. Stallman committed
265 266 267
  if (!NILP (handler))
    return call2 (handler, Qget_file_buffer, filename);

268
  for (tail = Vbuffer_alist; CONSP (tail); tail = XCDR (tail))
Roland McGrath's avatar
Roland McGrath committed
269
    {
270
      buf = Fcdr (XCAR (tail));
271
      if (!BUFFERP (buf)) continue;
Tom Tromey's avatar
Tom Tromey committed
272 273
      if (!STRINGP (BVAR (XBUFFER (buf), filename))) continue;
      tem = Fstring_equal (BVAR (XBUFFER (buf), filename), filename);
Jim Blandy's avatar
Jim Blandy committed
274
      if (!NILP (tem))
Roland McGrath's avatar
Roland McGrath committed
275 276 277 278 279
	return buf;
    }
  return Qnil;
}

280
Lisp_Object
281
get_truename_buffer (register Lisp_Object filename)
282 283 284
{
  register Lisp_Object tail, buf, tem;

285
  for (tail = Vbuffer_alist; CONSP (tail); tail = XCDR (tail))
286
    {
287
      buf = Fcdr (XCAR (tail));
288
      if (!BUFFERP (buf)) continue;
Tom Tromey's avatar
Tom Tromey committed
289 290
      if (!STRINGP (BVAR (XBUFFER (buf), file_truename))) continue;
      tem = Fstring_equal (BVAR (XBUFFER (buf), file_truename), filename);
291 292 293 294 295 296
      if (!NILP (tem))
	return buf;
    }
  return Qnil;
}

Paul Eggert's avatar
Paul Eggert committed
297
DEFUN ("get-buffer-create", Fget_buffer_create, Sget_buffer_create, 1, 1, 0,
298 299 300 301 302 303 304 305
       doc: /* Return the buffer specified by BUFFER-OR-NAME, creating a new one if needed.
If BUFFER-OR-NAME is a string and a live buffer with that name exists,
return that buffer.  If no such buffer exists, create a new buffer with
that name and return it.  If BUFFER-OR-NAME starts with a space, the new
buffer does not keep undo information.

If BUFFER-OR-NAME is a buffer instead of a string, return it as given,
even if it is dead.  The return value is never nil.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
306
  (register Lisp_Object buffer_or_name)
Roland McGrath's avatar
Roland McGrath committed
307
{
308
  register Lisp_Object buffer, name;
Roland McGrath's avatar
Roland McGrath committed
309 310
  register struct buffer *b;

311 312 313
  buffer = Fget_buffer (buffer_or_name);
  if (!NILP (buffer))
    return buffer;
Roland McGrath's avatar
Roland McGrath committed
314

315
  if (SCHARS (buffer_or_name) == 0)
316 317
    error ("Empty string for buffer name is not allowed");

318
  b = allocate_buffer ();
Roland McGrath's avatar
Roland McGrath committed
319

320 321 322 323
  /* An ordinary buffer uses its own struct buffer_text.  */
  b->text = &b->own_text;
  b->base_buffer = 0;

Roland McGrath's avatar
Roland McGrath committed
324
  BUF_GAP_SIZE (b) = 20;
325
  BLOCK_INPUT;
Karl Heuer's avatar
Karl Heuer committed
326 327
  /* We allocate extra 1-byte at the tail and keep it always '\0' for
     anchoring a search.  */
328
  alloc_buffer_text (b, BUF_GAP_SIZE (b) + 1);
329
  UNBLOCK_INPUT;
Roland McGrath's avatar
Roland McGrath committed
330
  if (! BUF_BEG_ADDR (b))
331
    buffer_memory_full ();
Roland McGrath's avatar
Roland McGrath committed
332

333 334 335 336 337 338 339
  b->pt = BEG;
  b->begv = BEG;
  b->zv = BEG;
  b->pt_byte = BEG_BYTE;
  b->begv_byte = BEG_BYTE;
  b->zv_byte = BEG_BYTE;

340 341
  BUF_GPT (b) = BEG;
  BUF_GPT_BYTE (b) = BEG_BYTE;
342 343

  BUF_Z (b) = BEG;
344
  BUF_Z_BYTE (b) = BEG_BYTE;
Roland McGrath's avatar
Roland McGrath committed
345
  BUF_MODIFF (b) = 1;
346
  BUF_CHARS_MODIFF (b) = 1;
347
  BUF_OVERLAY_MODIFF (b) = 1;
348 349
  BUF_SAVE_MODIFF (b) = 1;
  BUF_INTERVALS (b) = 0;
350 351 352 353
  BUF_UNCHANGED_MODIFIED (b) = 1;
  BUF_OVERLAY_UNCHANGED_MODIFIED (b) = 1;
  BUF_END_UNCHANGED (b) = 0;
  BUF_BEG_UNCHANGED (b) = 0;
Karl Heuer's avatar
Karl Heuer committed
354
  *(BUF_GPT_ADDR (b)) = *(BUF_Z_ADDR (b)) = 0; /* Put an anchor '\0'.  */
Roland McGrath's avatar
Roland McGrath committed
355

356 357
  b->newline_cache = 0;
  b->width_run_cache = 0;
Tom Tromey's avatar
Tom Tromey committed
358
  BVAR (b, width_table) = Qnil;
359
  b->prevent_redisplay_optimizations_p = 1;
360

Roland McGrath's avatar
Roland McGrath committed
361
  /* Put this on the chain of all buffers including killed ones.  */
362
  b->header.next.buffer = all_buffers;
Roland McGrath's avatar
Roland McGrath committed
363 364
  all_buffers = b;

365 366
  /* An ordinary buffer normally doesn't need markers
     to handle BEGV and ZV.  */
Tom Tromey's avatar
Tom Tromey committed
367 368 369
  BVAR (b, pt_marker) = Qnil;
  BVAR (b, begv_marker) = Qnil;
  BVAR (b, zv_marker) = Qnil;
370

371
  name = Fcopy_sequence (buffer_or_name);
372
  STRING_SET_INTERVALS (name, NULL_INTERVAL);
Tom Tromey's avatar
Tom Tromey committed
373
  BVAR (b, name) = name;
374

Tom Tromey's avatar
Tom Tromey committed
375
  BVAR (b, undo_list) = (SREF (name, 0) != ' ') ? Qnil : Qt;
Roland McGrath's avatar
Roland McGrath committed
376 377

  reset_buffer (b);
378
  reset_buffer_local_variables (b, 1);
Roland McGrath's avatar
Roland McGrath committed
379

Tom Tromey's avatar
Tom Tromey committed
380
  BVAR (b, mark) = Fmake_marker ();
381
  BUF_MARKERS (b) = NULL;
Tom Tromey's avatar
Tom Tromey committed
382
  BVAR (b, name) = name;
383

Roland McGrath's avatar
Roland McGrath committed
384
  /* Put this in the alist of all live buffers.  */
385 386
  XSETBUFFER (buffer, b);
  Vbuffer_alist = nconc2 (Vbuffer_alist, Fcons (Fcons (name, buffer), Qnil));
Roland McGrath's avatar
Roland McGrath committed
387

Juanma Barranquero's avatar
Juanma Barranquero committed
388
  /* An error in calling the function here (should someone redefine it)
Dave Love's avatar
Dave Love committed
389 390
     can lead to infinite regress until you run out of stack.  rms
     says that's not worth protecting against.  */
Dave Love's avatar
Dave Love committed
391
  if (!NILP (Ffboundp (Qucs_set_table_for_input)))
392 393
    /* buffer is on buffer-alist, so no gcpro.  */
    call1 (Qucs_set_table_for_input, buffer);
Dave Love's avatar
Dave Love committed
394

395
  return buffer;
396 397
}

398

399 400 401
/* Return a list of overlays which is a copy of the overlay list
   LIST, but for buffer B.  */

402
static struct Lisp_Overlay *
403
copy_overlays (struct buffer *b, struct Lisp_Overlay *list)
404
{
405 406
  Lisp_Object buffer;
  struct Lisp_Overlay *result = NULL, *tail = NULL;
407 408 409

  XSETBUFFER (buffer, b);

410
  for (; list; list = list->next)
411 412
    {
      Lisp_Object overlay, start, end, old_overlay;
413
      EMACS_INT charpos;
414

415
      XSETMISC (old_overlay, list);
416 417
      charpos = marker_position (OVERLAY_START (old_overlay));
      start = Fmake_marker ();
418
      Fset_marker (start, make_number (charpos), buffer);
419 420 421 422 423
      XMARKER (start)->insertion_type
	= XMARKER (OVERLAY_START (old_overlay))->insertion_type;

      charpos = marker_position (OVERLAY_END (old_overlay));
      end = Fmake_marker ();
424
      Fset_marker (end, make_number (charpos), buffer);
425 426 427 428 429 430 431 432
      XMARKER (end)->insertion_type
	= XMARKER (OVERLAY_END (old_overlay))->insertion_type;

      overlay = allocate_misc ();
      XMISCTYPE (overlay) = Lisp_Misc_Overlay;
      OVERLAY_START (overlay) = start;
      OVERLAY_END (overlay) = end;
      OVERLAY_PLIST (overlay) = Fcopy_sequence (OVERLAY_PLIST (old_overlay));
433
      XOVERLAY (overlay)->next = NULL;
434

435 436 437 438
      if (tail)
	tail = tail->next = XOVERLAY (overlay);
      else
	result = tail = XOVERLAY (overlay);
439 440
    }

441
  return result;
442
}
443

444

445 446 447 448 449 450 451 452
/* Clone per-buffer values of buffer FROM.

   Buffer TO gets the same per-buffer values as FROM, with the
   following exceptions: (1) TO's name is left untouched, (2) markers
   are copied and made to refer to TO, and (3) overlay lists are
   copied.  */

static void
453
clone_per_buffer_values (struct buffer *from, struct buffer *to)
454
{
455
  Lisp_Object to_buffer;
456 457 458
  int offset;

  XSETBUFFER (to_buffer, to);
459

460 461
  /* buffer-local Lisp variables start at `undo_list',
     tho only the ones from `name' on are GC'd normally.  */
462
  for (offset = PER_BUFFER_VAR_OFFSET (undo_list);
463 464 465 466 467
       offset < sizeof *to;
       offset += sizeof (Lisp_Object))
    {
      Lisp_Object obj;

468 469 470 471
      /* Don't touch the `name' which should be unique for every buffer.  */
      if (offset == PER_BUFFER_VAR_OFFSET (name))
	continue;

472
      obj = PER_BUFFER_VALUE (from, offset);
473
      if (MARKERP (obj) && XMARKER (obj)->buffer == from)
474 475 476 477 478 479 480 481 482 483
	{
	  struct Lisp_Marker *m = XMARKER (obj);
	  obj = Fmake_marker ();
	  XMARKER (obj)->insertion_type = m->insertion_type;
	  set_marker_both (obj, to_buffer, m->charpos, m->bytepos);
	}

      PER_BUFFER_VALUE (to, offset) = obj;
    }

484
  memcpy (to->local_flags, from->local_flags, sizeof to->local_flags);
485

486 487
  to->overlays_before = copy_overlays (to, from->overlays_before);
  to->overlays_after = copy_overlays (to, from->overlays_after);
488

489 490
  /* Get (a copy of) the alist of Lisp-level local variables of FROM
     and install that in TO.  */
Tom Tromey's avatar
Tom Tromey committed
491
  BVAR (to, local_var_alist) = buffer_lisp_local_variables (from);
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

/* If buffer B has markers to record PT, BEGV and ZV when it is not
   current, update these markers.  */

static void
record_buffer_markers (struct buffer *b)
{
  if (! NILP (BVAR (b, pt_marker)))
    {
      Lisp_Object buffer;

      eassert (!NILP (BVAR (b, begv_marker)));
      eassert (!NILP (BVAR (b, zv_marker)));

      XSETBUFFER (buffer, b);
      set_marker_both (BVAR (b, pt_marker), buffer, b->pt, b->pt_byte);
      set_marker_both (BVAR (b, begv_marker), buffer, b->begv, b->begv_byte);
      set_marker_both (BVAR (b, zv_marker), buffer, b->zv, b->zv_byte);
    }
}


/* If buffer B has markers to record PT, BEGV and ZV when it is not
   current, fetch these values into B->begv etc.  */

static void
fetch_buffer_markers (struct buffer *b)
{
  if (! NILP (BVAR (b, pt_marker)))
    {
      Lisp_Object m;

      eassert (!NILP (BVAR (b, begv_marker)));
      eassert (!NILP (BVAR (b, zv_marker)));

      m = BVAR (b, pt_marker);
      SET_BUF_PT_BOTH (b, marker_position (m), marker_byte_position (m));

      m = BVAR (b, begv_marker);
      SET_BUF_BEGV_BOTH (b, marker_position (m), marker_byte_position (m));

      m = BVAR (b, zv_marker);
      SET_BUF_ZV_BOTH (b, marker_position (m), marker_byte_position (m));
    }
}


541 542
DEFUN ("make-indirect-buffer", Fmake_indirect_buffer, Smake_indirect_buffer,
       2, 3,
543
       "bMake indirect buffer (to buffer): \nBName of indirect buffer: ",
544
       doc: /* Create and return an indirect buffer for buffer BASE-BUFFER, named NAME.
Kenichi Handa's avatar
Kenichi Handa committed
545
BASE-BUFFER should be a live buffer, or the name of an existing buffer.
Pavel Janík's avatar
Pavel Janík committed
546 547 548
NAME should be a string which is not the name of an existing buffer.
Optional argument CLONE non-nil means preserve BASE-BUFFER's state,
such as major and minor modes, in the indirect buffer.
549
CLONE nil means the indirect buffer's state is reset to default values.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
550
  (Lisp_Object base_buffer, Lisp_Object name, Lisp_Object clone)
551
{
Kenichi Handa's avatar
Kenichi Handa committed
552
  Lisp_Object buf, tem;
553
  struct buffer *b;
554

Kenichi Handa's avatar
Kenichi Handa committed
555
  CHECK_STRING (name);
556 557
  buf = Fget_buffer (name);
  if (!NILP (buf))
558
    error ("Buffer name `%s' is in use", SDATA (name));
559

Kenichi Handa's avatar
Kenichi Handa committed
560
  tem = base_buffer;
561 562
  base_buffer = Fget_buffer (base_buffer);
  if (NILP (base_buffer))
Kenichi Handa's avatar
Kenichi Handa committed
563
    error ("No such buffer: `%s'", SDATA (tem));
Tom Tromey's avatar
Tom Tromey committed
564
  if (NILP (BVAR (XBUFFER (base_buffer), name)))
Kenichi Handa's avatar
Kenichi Handa committed
565
    error ("Base buffer has been killed");
566

567
  if (SCHARS (name) == 0)
568 569
    error ("Empty string for buffer name is not allowed");

570
  b = allocate_buffer ();
571

572 573 574
  b->base_buffer = (XBUFFER (base_buffer)->base_buffer
		    ? XBUFFER (base_buffer)->base_buffer
		    : XBUFFER (base_buffer));
575 576 577 578

  /* Use the base buffer's text object.  */
  b->text = b->base_buffer->text;

579 580 581 582 583 584
  b->pt = b->base_buffer->pt;
  b->begv = b->base_buffer->begv;
  b->zv = b->base_buffer->zv;
  b->pt_byte = b->base_buffer->pt_byte;
  b->begv_byte = b->base_buffer->begv_byte;
  b->zv_byte = b->base_buffer->zv_byte;
585 586 587

  b->newline_cache = 0;
  b->width_run_cache = 0;
Tom Tromey's avatar
Tom Tromey committed
588
  BVAR (b, width_table) = Qnil;
589 590

  /* Put this on the chain of all buffers including killed ones.  */
591
  b->header.next.buffer = all_buffers;
592 593 594
  all_buffers = b;

  name = Fcopy_sequence (name);
595
  STRING_SET_INTERVALS (name, NULL_INTERVAL);
Tom Tromey's avatar
Tom Tromey committed
596
  BVAR (b, name) = name;
597 598

  reset_buffer (b);
599
  reset_buffer_local_variables (b, 1);
600 601 602 603 604

  /* Put this in the alist of all live buffers.  */
  XSETBUFFER (buf, b);
  Vbuffer_alist = nconc2 (Vbuffer_alist, Fcons (Fcons (name, buf), Qnil));

Tom Tromey's avatar
Tom Tromey committed
605 606
  BVAR (b, mark) = Fmake_marker ();
  BVAR (b, name) = name;
607

608
  /* The multibyte status belongs to the base buffer.  */
Tom Tromey's avatar
Tom Tromey committed
609
  BVAR (b, enable_multibyte_characters) = BVAR (b->base_buffer, enable_multibyte_characters);
610

611
  /* Make sure the base buffer has markers for its narrowing.  */
Tom Tromey's avatar
Tom Tromey committed
612
  if (NILP (BVAR (b->base_buffer, pt_marker)))
613
    {
614 615
      eassert (NILP (BVAR (b->base_buffer, begv_marker)));
      eassert (NILP (BVAR (b->base_buffer, zv_marker)));
616

Tom Tromey's avatar
Tom Tromey committed
617 618
      BVAR (b->base_buffer, pt_marker) = Fmake_marker ();
      set_marker_both (BVAR (b->base_buffer, pt_marker), base_buffer,
619 620 621
		       b->base_buffer->pt,
		       b->base_buffer->pt_byte);

Tom Tromey's avatar
Tom Tromey committed
622 623
      BVAR (b->base_buffer, begv_marker) = Fmake_marker ();
      set_marker_both (BVAR (b->base_buffer, begv_marker), base_buffer,
624 625 626
		       b->base_buffer->begv,
		       b->base_buffer->begv_byte);

Tom Tromey's avatar
Tom Tromey committed
627 628
      BVAR (b->base_buffer, zv_marker) = Fmake_marker ();
      set_marker_both (BVAR (b->base_buffer, zv_marker), base_buffer,
629 630
		       b->base_buffer->zv,
		       b->base_buffer->zv_byte);
Tom Tromey's avatar
Tom Tromey committed
631
      XMARKER (BVAR (b->base_buffer, zv_marker))->insertion_type = 1;
632 633
    }

634 635 636
  if (NILP (clone))
    {
      /* Give the indirect buffer markers for its narrowing.  */
Tom Tromey's avatar
Tom Tromey committed
637
      BVAR (b, pt_marker) = Fmake_marker ();
638
      set_marker_both (BVAR (b, pt_marker), buf, b->pt, b->pt_byte);
Tom Tromey's avatar
Tom Tromey committed
639
      BVAR (b, begv_marker) = Fmake_marker ();
640
      set_marker_both (BVAR (b, begv_marker), buf, b->begv, b->begv_byte);
Tom Tromey's avatar
Tom Tromey committed
641
      BVAR (b, zv_marker) = Fmake_marker ();
642
      set_marker_both (BVAR (b, zv_marker), buf, b->zv, b->zv_byte);
Tom Tromey's avatar
Tom Tromey committed
643
      XMARKER (BVAR (b, zv_marker))->insertion_type = 1;
644 645
    }
  else
646 647 648 649
    {
      struct buffer *old_b = current_buffer;

      clone_per_buffer_values (b->base_buffer, b);
Tom Tromey's avatar
Tom Tromey committed
650 651 652 653 654
      BVAR (b, filename) = Qnil;
      BVAR (b, file_truename) = Qnil;
      BVAR (b, display_count) = make_number (0);
      BVAR (b, backed_up) = Qnil;
      BVAR (b, auto_save_file_name) = Qnil;
655 656 657 658 659 660
      set_buffer_internal_1 (b);
      Fset (intern ("buffer-save-without-query"), Qnil);
      Fset (intern ("buffer-file-number"), Qnil);
      Fset (intern ("buffer-stale-function"), Qnil);
      set_buffer_internal_1 (old_b);
    }
661

662
  return buf;
Roland McGrath's avatar
Roland McGrath committed
663 664
}

665
void
666
delete_all_overlays (struct buffer *b)
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
{
  Lisp_Object overlay;

  /* `reset_buffer' blindly sets the list of overlays to NULL, so we
     have to empty the list, otherwise we end up with overlays that
     think they belong to this buffer while the buffer doesn't know about
     them any more.  */
  while (b->overlays_before)
    {
      XSETMISC (overlay, b->overlays_before);
      Fdelete_overlay (overlay);
    }
  while (b->overlays_after)
    {
      XSETMISC (overlay, b->overlays_after);
      Fdelete_overlay (overlay);
    }
  eassert (b->overlays_before == NULL);
  eassert (b->overlays_after == NULL);
}

688
/* Reinitialize everything about a buffer except its name and contents
Kenichi Handa's avatar
Kenichi Handa committed
689
   and local variables.
690 691 692 693
   If called on an already-initialized buffer, the list of overlays
   should be deleted before calling this function, otherwise we end up
   with overlays that claim to belong to the buffer but the buffer
   claims it doesn't belong to it.  */
Roland McGrath's avatar
Roland McGrath committed
694 695

void
696
reset_buffer (register struct buffer *b)
Roland McGrath's avatar
Roland McGrath committed
697
{
Tom Tromey's avatar
Tom Tromey committed
698 699 700
  BVAR (b, filename) = Qnil;
  BVAR (b, file_truename) = Qnil;
  BVAR (b, directory) = (current_buffer) ? BVAR (current_buffer, directory) : Qnil;
Roland McGrath's avatar
Roland McGrath committed
701
  b->modtime = 0;
702
  b->modtime_size = -1;
Tom Tromey's avatar
Tom Tromey committed
703
  XSETFASTINT (BVAR (b, save_length), 0);
Roland McGrath's avatar
Roland McGrath committed
704
  b->last_window_start = 1;
705
  /* It is more conservative to start out "changed" than "unchanged".  */
706 707
  b->clip_changed = 0;
  b->prevent_redisplay_optimizations_p = 1;
Tom Tromey's avatar
Tom Tromey committed
708
  BVAR (b, backed_up) = Qnil;
709
  BUF_AUTOSAVE_MODIFF (b) = 0;
710
  b->auto_save_failure_time = -1;
Tom Tromey's avatar
Tom Tromey committed
711 712
  BVAR (b, auto_save_file_name) = Qnil;
  BVAR (b, read_only) = Qnil;
713 714
  b->overlays_before = NULL;
  b->overlays_after = NULL;
715
  b->overlay_center = BEG;
Tom Tromey's avatar
Tom Tromey committed
716 717 718 719 720 721 722 723 724 725
  BVAR (b, mark_active) = Qnil;
  BVAR (b, point_before_scroll) = Qnil;
  BVAR (b, file_format) = Qnil;
  BVAR (b, auto_save_file_format) = Qt;
  BVAR (b, last_selected_window) = Qnil;
  XSETINT (BVAR (b, display_count), 0);
  BVAR (b, display_time) = Qnil;
  BVAR (b, enable_multibyte_characters) = BVAR (&buffer_defaults, enable_multibyte_characters);
  BVAR (b, cursor_type) = BVAR (&buffer_defaults, cursor_type);
  BVAR (b, extra_line_spacing) = BVAR (&buffer_defaults, extra_line_spacing);
726 727

  b->display_error_modiff = 0;
Roland McGrath's avatar
Roland McGrath committed
728 729
}

730 731 732
/* Reset buffer B's local variables info.
   Don't use this on a buffer that has already been in use;
   it does not treat permanent locals consistently.
733 734
   Instead, use Fkill_all_local_variables.

735
   If PERMANENT_TOO is 1, then we reset permanent
736 737
   buffer-local variables.  If PERMANENT_TOO is 0,
   we preserve those.  */
738

739
static void
740
reset_buffer_local_variables (register struct buffer *b, int permanent_too)
Roland McGrath's avatar
Roland McGrath committed
741 742
{
  register int offset;
743
  int i;
Roland McGrath's avatar
Roland McGrath committed
744 745 746 747 748

  /* Reset the major mode to Fundamental, together with all the
     things that depend on the major mode.
     default-major-mode is handled at a higher level.
     We ignore it here.  */
Tom Tromey's avatar
Tom Tromey committed
749 750 751 752
  BVAR (b, major_mode) = Qfundamental_mode;
  BVAR (b, keymap) = Qnil;
  BVAR (b, mode_name) = QSFundamental;
  BVAR (b, minor_modes) = Qnil;
753 754 755 756 757 758 759 760

  /* If the standard case table has been altered and invalidated,
     fix up its insides first.  */
  if (! (CHAR_TABLE_P (XCHAR_TABLE (Vascii_downcase_table)->extras[0])
	 && CHAR_TABLE_P (XCHAR_TABLE (Vascii_downcase_table)->extras[1])
	 && CHAR_TABLE_P (XCHAR_TABLE (Vascii_downcase_table)->extras[2])))
    Fset_standard_case_table (Vascii_downcase_table);

Tom Tromey's avatar
Tom Tromey committed
761 762 763 764 765
  BVAR (b, downcase_table) = Vascii_downcase_table;
  BVAR (b, upcase_table) = XCHAR_TABLE (Vascii_downcase_table)->extras[0];
  BVAR (b, case_canon_table) = XCHAR_TABLE (Vascii_downcase_table)->extras[1];
  BVAR (b, case_eqv_table) = XCHAR_TABLE (Vascii_downcase_table)->extras[2];
  BVAR (b, invisibility_spec) = Qt;
766

767
  /* Reset all (or most) per-buffer variables to their defaults.  */
768
  if (permanent_too)
Tom Tromey's avatar
Tom Tromey committed
769
    BVAR (b, local_var_alist) = Qnil;
770 771
  else
    {
772
      Lisp_Object tmp, prop, last = Qnil;
Tom Tromey's avatar
Tom Tromey committed
773
      for (tmp = BVAR (b, local_var_alist); CONSP (tmp); tmp = XCDR (tmp))
774
	if (!NILP (prop = Fget (XCAR (XCAR (tmp)), Qpermanent_local)))
775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
	  {
	    /* If permanent-local, keep it.  */
	    last = tmp;
	    if (EQ (prop, Qpermanent_local_hook))
	      {
		/* This is a partially permanent hook variable.
		   Preserve only the elements that want to be preserved.  */
		Lisp_Object list, newlist;
		list = XCDR (XCAR (tmp));
		if (!CONSP (list))
		  newlist = list;
		else
		  for (newlist = Qnil; CONSP (list); list = XCDR (list))
		    {
		      Lisp_Object elt = XCAR (list);
		      /* Preserve element ELT if it's t,
			 if it is a function with a `permanent-local-hook' property,
			 or if it's not a symbol.  */
		      if (! SYMBOLP (elt)
			  || EQ (elt, Qt)
			  || !NILP (Fget (elt, Qpermanent_local_hook)))
			newlist = Fcons (elt, newlist);
		    }
		XSETCDR (XCAR (tmp), Fnreverse (newlist));
	      }
	  }
	/* Delete this local variable.  */
802
	else if (NILP (last))
Tom Tromey's avatar
Tom Tromey committed
803
	  BVAR (b, local_var_alist) = XCDR (tmp);
804 805 806 807
	else
	  XSETCDR (last, XCDR (tmp));
    }

808
  for (i = 0; i < last_per_buffer_idx; ++i)
809
    if (permanent_too || buffer_permanent_local_flags[i] == 0)
810
      SET_PER_BUFFER_VALUE_P (b, i, 0);
Roland McGrath's avatar
Roland McGrath committed
811 812 813 814

  /* For each slot that has a default value,
     copy that into the slot.  */

815 816 817
  /* buffer-local Lisp variables start at `undo_list',
     tho only the ones from `name' on are GC'd normally.  */
  for (offset = PER_BUFFER_VAR_OFFSET (undo_list);
818 819
       offset < sizeof *b;
       offset += sizeof (Lisp_Object))
820
    {
821
      int idx = PER_BUFFER_IDX (offset);
822 823
      if ((idx > 0
	   && (permanent_too
824
	       || buffer_permanent_local_flags[idx] == 0)))
825
	PER_BUFFER_VALUE (b, offset) = PER_BUFFER_DEFAULT (offset);
826
    }
Roland McGrath's avatar
Roland McGrath committed
827 828
}

Roland McGrath's avatar
Roland McGrath committed
829 830 831 832
/* We split this away from generate-new-buffer, because rename-buffer
   and set-visited-file-name ought to be able to use this to really
   rename the buffer properly.  */

Paul Eggert's avatar
Paul Eggert committed
833
DEFUN ("generate-new-buffer-name", Fgenerate_new_buffer_name,
834
       Sgenerate_new_buffer_name, 1, 2, 0,
835
       doc: /* Return a string that is the name of no existing buffer based on NAME.
Pavel Janík's avatar
Pavel Janík committed
836 837
If there is no live buffer named NAME, then return NAME.
Otherwise modify name by appending `<NUMBER>', incrementing NUMBER
Kenichi Handa's avatar
Kenichi Handa committed
838
\(starting at 2) until an unused name is found, and then return that name.
Juanma Barranquero's avatar
Juanma Barranquero committed
839 840
Optional second argument IGNORE specifies a name that is okay to use (if
it is in the sequence to be tried) even if a buffer with that name exists.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
841
  (register Lisp_Object name, Lisp_Object ignore)
Roland McGrath's avatar
Roland McGrath committed
842 843 844 845