buffer.h 36.8 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Header file for the buffer manipulation primitives.
2
   Copyright (C) 1985, 1986, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001,
Glenn Morris's avatar
Glenn Morris committed
3
                 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Glenn Morris's avatar
Glenn Morris committed
4
                 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


22
/* Accessing the parameters of the current buffer.  */
23

24 25
/* These macros come in pairs, one for the char position
   and one for the byte position.  */
Jim Blandy's avatar
Jim Blandy committed
26

27
/* Position of beginning of buffer.  */
Jim Blandy's avatar
Jim Blandy committed
28
#define BEG (1)
29
#define BEG_BYTE (BEG)
Jim Blandy's avatar
Jim Blandy committed
30

31
/* Position of beginning of accessible range of buffer.  */
32
#define BEGV (current_buffer->begv)
33
#define BEGV_BYTE (current_buffer->begv_byte)
Jim Blandy's avatar
Jim Blandy committed
34

35
/* Position of point in buffer.  The "+ 0" makes this
36
   not an l-value, so you can't assign to it.  Use SET_PT instead.  */
37
#define PT (current_buffer->pt + 0)
38
#define PT_BYTE (current_buffer->pt_byte + 0)
Jim Blandy's avatar
Jim Blandy committed
39

40
/* Position of gap in buffer.  */
41
#define GPT (current_buffer->text->gpt)
42
#define GPT_BYTE (current_buffer->text->gpt_byte)
Jim Blandy's avatar
Jim Blandy committed
43

44
/* Position of end of accessible range of buffer.  */
45
#define ZV (current_buffer->zv)
46
#define ZV_BYTE (current_buffer->zv_byte)
Jim Blandy's avatar
Jim Blandy committed
47

48
/* Position of end of buffer.  */
49
#define Z (current_buffer->text->z)
50
#define Z_BYTE (current_buffer->text->z_byte)
Jim Blandy's avatar
Jim Blandy committed
51

52
/* Macros for the addresses of places in the buffer.  */
Jim Blandy's avatar
Jim Blandy committed
53

54
/* Address of beginning of buffer.  */
55
#define BEG_ADDR (current_buffer->text->beg)
Jim Blandy's avatar
Jim Blandy committed
56

57
/* Address of beginning of accessible range of buffer.  */
58
#define BEGV_ADDR (BYTE_POS_ADDR (current_buffer->begv_byte))
Jim Blandy's avatar
Jim Blandy committed
59

60
/* Address of point in buffer.  */
61
#define PT_ADDR (BYTE_POS_ADDR (current_buffer->pt_byte))
Jim Blandy's avatar
Jim Blandy committed
62

63
/* Address of beginning of gap in buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
64
#define GPT_ADDR (current_buffer->text->beg + current_buffer->text->gpt_byte - BEG_BYTE)
Jim Blandy's avatar
Jim Blandy committed
65 66

/* Address of end of gap in buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
67
#define GAP_END_ADDR (current_buffer->text->beg + current_buffer->text->gpt_byte + current_buffer->text->gap_size - BEG_BYTE)
Jim Blandy's avatar
Jim Blandy committed
68

69
/* Address of end of accessible range of buffer.  */
70
#define ZV_ADDR (BYTE_POS_ADDR (current_buffer->zv_byte))
71

72
/* Address of end of buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
73
#define Z_ADDR (current_buffer->text->beg + current_buffer->text->gap_size + current_buffer->text->z_byte - BEG_BYTE)
Jim Blandy's avatar
Jim Blandy committed
74 75

/* Size of gap.  */
76
#define GAP_SIZE (current_buffer->text->gap_size)
Jim Blandy's avatar
Jim Blandy committed
77

78 79 80 81 82 83
/* Is the current buffer narrowed?  */
#define NARROWED	((BEGV != BEG) || (ZV != Z))

/* Modification count.  */
#define MODIFF (current_buffer->text->modiff)

84 85 86
/* Character modification count.  */
#define CHARS_MODIFF (current_buffer->text->chars_modiff)

87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
/* Overlay modification count.  */
#define OVERLAY_MODIFF (current_buffer->text->overlay_modiff)

/* Modification count as of last visit or save.  */
#define SAVE_MODIFF (current_buffer->text->save_modiff)

/* BUFFER_CEILING_OF (resp. BUFFER_FLOOR_OF), when applied to n, return
   the max (resp. min) p such that

   BYTE_POS_ADDR (p) - BYTE_POS_ADDR (n) == p - n       */

#define BUFFER_CEILING_OF(BYTEPOS) \
  (((BYTEPOS) < GPT_BYTE && GPT < ZV ? GPT_BYTE : ZV_BYTE) - 1)
#define BUFFER_FLOOR_OF(BYTEPOS) \
  (BEGV <= GPT && GPT_BYTE <= (BYTEPOS) ? GPT_BYTE : BEGV_BYTE)

/* Similar macros to operate on a specified buffer.
Jim Blandy's avatar
Jim Blandy committed
104 105
   Note that many of these evaluate the buffer argument more than once.  */

106
/* Position of beginning of buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
107 108
#define BUF_BEG(buf) (BEG)
#define BUF_BEG_BYTE(buf) (BEG_BYTE)
Jim Blandy's avatar
Jim Blandy committed
109

110
/* Position of beginning of accessible range of buffer.  */
111
#define BUF_BEGV(buf) ((buf)->begv)
112
#define BUF_BEGV_BYTE(buf) ((buf)->begv_byte)
Jim Blandy's avatar
Jim Blandy committed
113

114
/* Position of point in buffer.  */
115
#define BUF_PT(buf) ((buf)->pt)
116
#define BUF_PT_BYTE(buf) ((buf)->pt_byte)
Jim Blandy's avatar
Jim Blandy committed
117

118
/* Position of gap in buffer.  */
119
#define BUF_GPT(buf) ((buf)->text->gpt)
120
#define BUF_GPT_BYTE(buf) ((buf)->text->gpt_byte)
Jim Blandy's avatar
Jim Blandy committed
121

122
/* Position of end of accessible range of buffer.  */
123
#define BUF_ZV(buf) ((buf)->zv)
124
#define BUF_ZV_BYTE(buf) ((buf)->zv_byte)
Jim Blandy's avatar
Jim Blandy committed
125

126
/* Position of end of buffer.  */
127
#define BUF_Z(buf) ((buf)->text->z)
128 129 130 131 132 133
#define BUF_Z_BYTE(buf) ((buf)->text->z_byte)

/* Address of beginning of buffer.  */
#define BUF_BEG_ADDR(buf) ((buf)->text->beg)

/* Address of beginning of gap of buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
134
#define BUF_GPT_ADDR(buf) ((buf)->text->beg + (buf)->text->gpt_byte - BEG_BYTE)
135 136

/* Address of end of buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
137
#define BUF_Z_ADDR(buf) ((buf)->text->beg + (buf)->text->gap_size + (buf)->text->z_byte - BEG_BYTE)
138 139

/* Address of end of gap in buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
140
#define BUF_GAP_END_ADDR(buf) ((buf)->text->beg + (buf)->text->gpt_byte + (buf)->text->gap_size - BEG_BYTE)
Jim Blandy's avatar
Jim Blandy committed
141

142 143 144 145
/* Size of gap.  */
#define BUF_GAP_SIZE(buf) ((buf)->text->gap_size)

/* Is this buffer narrowed?  */
146 147
#define BUF_NARROWED(buf) ((BUF_BEGV (buf) != BUF_BEG (buf)) \
			   || (BUF_ZV (buf) != BUF_Z (buf)))
148

Jim Blandy's avatar
Jim Blandy committed
149
/* Modification count.  */
150 151
#define BUF_MODIFF(buf) ((buf)->text->modiff)

152 153 154
/* Character modification count.  */
#define BUF_CHARS_MODIFF(buf) ((buf)->text->chars_modiff)

155 156 157
/* Modification count as of last visit or save.  */
#define BUF_SAVE_MODIFF(buf) ((buf)->text->save_modiff)

158 159 160
/* Overlay modification count.  */
#define BUF_OVERLAY_MODIFF(buf) ((buf)->text->overlay_modiff)

161 162 163 164 165
/* Interval tree of buffer.  */
#define BUF_INTERVALS(buf) ((buf)->text->intervals)

/* Marker chain of buffer.  */
#define BUF_MARKERS(buf) ((buf)->text->markers)
Gerd Moellmann's avatar
Gerd Moellmann committed
166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188

#define BUF_UNCHANGED_MODIFIED(buf) \
  ((buf)->text->unchanged_modified)

#define BUF_OVERLAY_UNCHANGED_MODIFIED(buf) \
  ((buf)->text->overlay_unchanged_modified)
#define BUF_BEG_UNCHANGED(buf) ((buf)->text->beg_unchanged)
#define BUF_END_UNCHANGED(buf) ((buf)->text->end_unchanged)

#define UNCHANGED_MODIFIED \
  BUF_UNCHANGED_MODIFIED (current_buffer)
#define OVERLAY_UNCHANGED_MODIFIED \
  BUF_OVERLAY_UNCHANGED_MODIFIED (current_buffer)
#define BEG_UNCHANGED BUF_BEG_UNCHANGED (current_buffer)
#define END_UNCHANGED BUF_END_UNCHANGED (current_buffer)

/* Compute how many characters at the top and bottom of BUF are
   unchanged when the range START..END is modified.  This computation
   must be done each time BUF is modified.  */

#define BUF_COMPUTE_UNCHANGED(buf, start, end)				\
  do									\
    {									\
189 190 191
      if (BUF_UNCHANGED_MODIFIED (buf) == BUF_MODIFF (buf)		\
	  && (BUF_OVERLAY_UNCHANGED_MODIFIED (buf)			\
	      == BUF_OVERLAY_MODIFF (buf)))				\
Gerd Moellmann's avatar
Gerd Moellmann committed
192 193 194 195 196 197 198 199 200 201 202 203 204
	{								\
	  BUF_BEG_UNCHANGED (buf) = (start) - BUF_BEG (buf);		\
	  BUF_END_UNCHANGED (buf) = BUF_Z (buf) - (end);		\
	}								\
      else								\
	{								\
	  if (BUF_Z (buf) - (end) < BUF_END_UNCHANGED (buf))		\
	    BUF_END_UNCHANGED (buf) = BUF_Z (buf) - (end);		\
	  if ((start) - BUF_BEG (buf) < BUF_BEG_UNCHANGED (buf))	\
	    BUF_BEG_UNCHANGED (buf) = (start) - BUF_BEG (buf);		\
	}								\
    }									\
  while (0)
205

206

Pavel Janík's avatar
Pavel Janík committed
207
/* Macros to set PT in the current buffer, or another buffer.  */
Jim Blandy's avatar
Jim Blandy committed
208

209
#define SET_PT(position) (set_point (position))
210
#define TEMP_SET_PT(position) (temp_set_point (current_buffer, (position)))
Jim Blandy's avatar
Jim Blandy committed
211

212
#define SET_PT_BOTH(position, byte) (set_point_both (position, byte))
213 214
#define TEMP_SET_PT_BOTH(position, byte) \
  (temp_set_point_both (current_buffer, (position), (byte)))
215

216 217
#define BUF_TEMP_SET_PT(buffer, position) \
  (temp_set_point ((buffer), (position)))
218

219 220 221 222 223 224
extern void set_point P_ ((EMACS_INT));
extern INLINE void temp_set_point P_ ((struct buffer *, EMACS_INT));
extern void set_point_both P_ ((EMACS_INT, EMACS_INT));
extern INLINE void temp_set_point_both P_ ((struct buffer *,
					    EMACS_INT, EMACS_INT));
extern void enlarge_buffer_text P_ ((struct buffer *, EMACS_INT));
Jim Blandy's avatar
Jim Blandy committed
225

226 227 228 229 230 231 232 233 234 235

/* Macros for setting the BEGV, ZV or PT of a given buffer.

   SET_BUF_PT* seet to be redundant.  Get rid of them?

   The ..._BOTH macros take both a charpos and a bytepos,
   which must correspond to each other.

   The macros without ..._BOTH take just a charpos,
   and compute the bytepos from it.  */
Jim Blandy's avatar
Jim Blandy committed
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
#define SET_BUF_BEGV(buf, charpos)				 \
  ((buf)->begv_byte = buf_charpos_to_bytepos ((buf), (charpos)), \
   (buf)->begv = (charpos))

#define SET_BUF_ZV(buf, charpos)				\
  ((buf)->zv_byte = buf_charpos_to_bytepos ((buf), (charpos)),	\
   (buf)->zv = (charpos))

#define SET_BUF_BEGV_BOTH(buf, charpos, byte)		\
  ((buf)->begv = (charpos),				\
   (buf)->begv_byte = (byte))

#define SET_BUF_ZV_BOTH(buf, charpos, byte)		\
  ((buf)->zv = (charpos),				\
   (buf)->zv_byte = (byte))

#define SET_BUF_PT_BOTH(buf, charpos, byte)		\
  ((buf)->pt = (charpos),				\
   (buf)->pt_byte = (byte))

/* Macros to access a character or byte in the current buffer,
   or convert between a byte position and an address.
   These macros do not check that the position is in range.  */

/* Access a Lisp position value in POS,
Eli Zaretskii's avatar
Eli Zaretskii committed
262
   and store the charpos in CHARPOS and the bytepos in BYTEPOS.  */
263 264

#define DECODE_POSITION(charpos, bytepos, pos)			\
265
do								\
266 267 268 269 270 271 272 273 274 275 276 277 278 279 280
  {								\
    Lisp_Object __pos = (pos);					\
    if (NUMBERP (__pos))					\
      {								\
	charpos = __pos;					\
	bytepos = buf_charpos_to_bytepos (current_buffer, __pos);  \
      }								\
    else if (MARKERP (__pos))					\
      {								\
	charpos = marker_position (__pos);			\
	bytepos = marker_byte_position (__pos);			\
      }								\
    else							\
      wrong_type_argument (Qinteger_or_marker_p, __pos);	\
  }								\
281
while (0)
282 283 284 285

/* Return the address of byte position N in current buffer.  */

#define BYTE_POS_ADDR(n) \
Stefan Monnier's avatar
Stefan Monnier committed
286
  (((n) >= GPT_BYTE ? GAP_SIZE : 0) + (n) + BEG_ADDR - BEG_BYTE)
287 288 289 290 291 292

/* Return the address of char position N.  */

#define CHAR_POS_ADDR(n)			\
  (((n) >= GPT ? GAP_SIZE : 0)			\
   + buf_charpos_to_bytepos (current_buffer, n)	\
Stefan Monnier's avatar
Stefan Monnier committed
293
   + BEG_ADDR - BEG_BYTE)
294 295 296 297 298 299 300 301 302 303 304 305 306 307 308

/* Convert a character position to a byte position.  */

#define CHAR_TO_BYTE(charpos)			\
  (buf_charpos_to_bytepos (current_buffer, charpos))

/* Convert a byte position to a character position.  */

#define BYTE_TO_CHAR(bytepos)			\
  (buf_bytepos_to_charpos (current_buffer, bytepos))

/* Convert PTR, the address of a byte in the buffer, into a byte position.  */

#define PTR_BYTE_POS(ptr) \
((ptr) - (current_buffer)->text->beg					    \
Stefan Monnier's avatar
Stefan Monnier committed
309 310
 - (ptr - (current_buffer)->text->beg <= (unsigned) (GPT_BYTE - BEG_BYTE) ? 0 : GAP_SIZE) \
 + BEG_BYTE)
311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331

/* Return character at position POS.  */

#define FETCH_CHAR(pos)				      	\
  (!NILP (current_buffer->enable_multibyte_characters)	\
   ? FETCH_MULTIBYTE_CHAR ((pos))		      	\
   : FETCH_BYTE ((pos)))

/* Return the byte at byte position N.  */

#define FETCH_BYTE(n) *(BYTE_POS_ADDR ((n)))

/* Variables used locally in FETCH_MULTIBYTE_CHAR.  */
extern unsigned char *_fetch_multibyte_char_p;

/* Return character code of multi-byte form at position POS.  If POS
   doesn't point the head of valid multi-byte form, only the byte at
   POS is returned.  No range checking.  */

#define FETCH_MULTIBYTE_CHAR(pos)				 	\
  (_fetch_multibyte_char_p = (((pos) >= GPT_BYTE ? GAP_SIZE : 0) 	\
Kenichi Handa's avatar
Kenichi Handa committed
332
			       + (pos) + BEG_ADDR - BEG_BYTE),	 	\
333
   STRING_CHAR (_fetch_multibyte_char_p))
334 335 336 337 338 339 340 341

/* Return character at position POS.  If the current buffer is unibyte
   and the character is not ASCII, make the returning character
   multibyte.  */

#define FETCH_CHAR_AS_MULTIBYTE(pos)			\
  (!NILP (current_buffer->enable_multibyte_characters)	\
   ? FETCH_MULTIBYTE_CHAR ((pos))			\
342
   : UNIBYTE_TO_CHAR (FETCH_BYTE ((pos))))
343

344 345 346 347 348

/* Macros for accessing a character or byte,
   or converting between byte positions and addresses,
   in a specified buffer.  */

349
/* Return the address of character at byte position POS in buffer BUF.
Jim Blandy's avatar
Jim Blandy committed
350
   Note that both arguments can be computed more than once.  */
351 352

#define BUF_BYTE_ADDRESS(buf, pos) \
Stefan Monnier's avatar
Stefan Monnier committed
353
((buf)->text->beg + (pos) - BEG_BYTE		\
354 355
 + ((pos) >= (buf)->text->gpt_byte ? (buf)->text->gap_size : 0))

356
/* Return the address of character at char position POS in buffer BUF.
357 358 359
   Note that both arguments can be computed more than once.  */

#define BUF_CHAR_ADDRESS(buf, pos) \
Stefan Monnier's avatar
Stefan Monnier committed
360
((buf)->text->beg + buf_charpos_to_bytepos ((buf), (pos)) - BEG_BYTE	\
361
 + ((pos) >= (buf)->text->gpt ? (buf)->text->gap_size : 0))
Jim Blandy's avatar
Jim Blandy committed
362

363 364
/* Convert PTR, the address of a char in buffer BUF,
   into a character position.  */
365

366 367
#define BUF_PTR_BYTE_POS(buf, ptr)				\
((ptr) - (buf)->text->beg					\
Stefan Monnier's avatar
Stefan Monnier committed
368
 - (ptr - (buf)->text->beg <= (unsigned) (BUF_GPT_BYTE ((buf)) - BEG_BYTE)\
369
    ? 0 : BUF_GAP_SIZE ((buf)))					\
Stefan Monnier's avatar
Stefan Monnier committed
370
 + BEG_BYTE)
371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390

/* Return the character at byte position POS in buffer BUF.   */

#define BUF_FETCH_CHAR(buf, pos)	      	\
  (!NILP (buf->enable_multibyte_characters)	\
   ? BUF_FETCH_MULTIBYTE_CHAR ((buf), (pos))    \
   : BUF_FETCH_BYTE ((buf), (pos)))

/* Return the byte at byte position N in buffer BUF.   */

#define BUF_FETCH_BYTE(buf, n) \
  *(BUF_BYTE_ADDRESS ((buf), (n)))

/* Return character code of multi-byte form at byte position POS in BUF.
   If POS doesn't point the head of valid multi-byte form, only the byte at
   POS is returned.  No range checking.  */

#define BUF_FETCH_MULTIBYTE_CHAR(buf, pos)				\
  (_fetch_multibyte_char_p						\
     = (((pos) >= BUF_GPT_BYTE (buf) ? BUF_GAP_SIZE (buf) : 0)		\
Stefan Monnier's avatar
Stefan Monnier committed
391
        + (pos) + BUF_BEG_ADDR (buf) - BEG_BYTE),			\
392
   STRING_CHAR (_fetch_multibyte_char_p))
Jim Blandy's avatar
Jim Blandy committed
393

394 395 396 397 398
/* Define the actual buffer data structures.  */

/* This data structure describes the actual text contents of a buffer.
   It is shared between indirect buffers and their base buffer.  */

Jim Blandy's avatar
Jim Blandy committed
399 400
struct buffer_text
  {
401 402 403 404 405
    /* Actual address of buffer contents.  If REL_ALLOC is defined,
       this address might change when blocks are relocated which can
       e.g. happen when malloc is called.  So, don't pass a pointer
       into a buffer's text to functions that malloc.  */
    unsigned char *beg;
406

407 408 409 410 411
    EMACS_INT gpt;		/* Char pos of gap in buffer.  */
    EMACS_INT z;		/* Char pos of end of buffer.  */
    EMACS_INT gpt_byte;		/* Byte pos of gap in buffer.  */
    EMACS_INT z_byte;		/* Byte pos of end of buffer.  */
    EMACS_INT gap_size;		/* Size of buffer's gap.  */
Jim Blandy's avatar
Jim Blandy committed
412 413 414 415
    int modiff;			/* This counts buffer-modification events
				   for this buffer.  It is incremented for
				   each such event, and never otherwise
				   changed.  */
416 417 418 419
    int chars_modiff;           /* This is modified with character change
				   events for this buffer.  It is set to
				   modiff for each such event, and never
				   otherwise changed.  */
420 421 422
    int save_modiff;		/* Previous value of modiff, as of last
				   time buffer visited or saved a file.  */

423 424
    int overlay_modiff;		/* Counts modifications to overlays.  */

Gerd Moellmann's avatar
Gerd Moellmann committed
425
    /* Minimum value of GPT - BEG since last redisplay that finished.  */
426
    EMACS_INT beg_unchanged;
Gerd Moellmann's avatar
Gerd Moellmann committed
427 428

    /* Minimum value of Z - GPT since last redisplay that finished.  */
429
    EMACS_INT end_unchanged;
Gerd Moellmann's avatar
Gerd Moellmann committed
430 431 432 433 434 435 436 437 438 439

    /* MODIFF as of last redisplay that finished; if it matches MODIFF,
       beg_unchanged and end_unchanged contain no useful information.  */
    int unchanged_modified;

    /* BUF_OVERLAY_MODIFF of current buffer, as of last redisplay that
       finished; if it matches BUF_OVERLAY_MODIFF, beg_unchanged and
       end_unchanged contain no useful information.  */
    int overlay_unchanged_modified;

Dave Love's avatar
Dave Love committed
440 441
    /* Properties of this buffer's text.  */
    INTERVAL intervals;
442 443 444 445 446

    /* The markers that refer to this buffer.
       This is actually a single marker ---
       successive elements in its marker `chain'
       are the other markers referring to this buffer.  */
447
    struct Lisp_Marker *markers;
448 449 450 451 452

    /* Usually 0.  Temporarily set to 1 in decode_coding_gap to
       prevent Fgarbage_collect from shrinking the gap and loosing
       not-yet-decoded bytes.  */
    int inhibit_shrinking;
Jim Blandy's avatar
Jim Blandy committed
453 454
  };

455 456
/* This is the structure that the buffer Lisp object points to.  */

Jim Blandy's avatar
Jim Blandy committed
457
struct buffer
458 459 460 461 462 463
{
  /* Everything before the `name' slot must be of a non-Lisp_Object type,
     and every slot after `name' must be a Lisp_Object.

     Check out mark_buffer (alloc.c) to see why.  */

Stefan Monnier's avatar
Stefan Monnier committed
464
  EMACS_UINT size;
465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482

  /* Next buffer, in chain of all buffers including killed buffers.
     This chain is used only for garbage collection, in order to
     collect killed buffers properly.
     Note that vectors and most pseudovectors are all on one chain,
     but buffers are on a separate chain of their own.  */
  struct buffer *next;

  /* This structure holds the coordinates of the buffer contents
     in ordinary buffers.  In indirect buffers, this is not used.  */
  struct buffer_text own_text;

  /* This points to the `struct buffer_text' that used for this buffer.
     In an ordinary buffer, this is the own_text field above.
     In an indirect buffer, this is the own_text field of another buffer.  */
  struct buffer_text *text;

  /* Char position of point in buffer.  */
483
  EMACS_INT pt;
484
  /* Byte position of point in buffer.  */
485
  EMACS_INT pt_byte;
486
  /* Char position of beginning of accessible range.  */
487
  EMACS_INT begv;
488
  /* Byte position of beginning of accessible range.  */
489
  EMACS_INT begv_byte;
490
  /* Char position of end of accessible range.  */
491
  EMACS_INT zv;
492
  /* Byte position of end of accessible range.  */
493
  EMACS_INT zv_byte;
494 495 496 497 498 499 500 501 502 503

  /* In an indirect buffer, this points to the base buffer.
     In an ordinary buffer, it is 0.  */
  struct buffer *base_buffer;

  /* A non-zero value in slot IDX means that per-buffer variable
     with index IDX has a local value in this buffer.  The index IDX
     for a buffer-local variable is stored in that variable's slot
     in buffer_local_flags as a Lisp integer.  If the index is -1,
     this means the variable is always local in all buffers.  */
504
#define MAX_PER_BUFFER_VARS 50
505
  char local_flags[MAX_PER_BUFFER_VARS];
506

507 508 509 510 511
  /* Set to the modtime of the visited file when read or written.
     -1 means visited file was nonexistent.
     0 means visited file modtime unknown; in no case complain
     about any mismatch on next save attempt.  */
  int modtime;
512
  /* The value of text->modiff at the last auto-save.  */
513
  int auto_save_modified;
514 515 516
  /* The value of text->modiff at the last display error.
     Redisplay of this buffer is inhibited until it changes again.  */
  int display_error_modiff;
517 518 519 520 521
  /* The time at which we detected a failure to auto-save,
     Or -1 if we didn't have a failure.  */
  int auto_save_failure_time;
  /* Position in buffer at which display started
     the last time this buffer was displayed.  */
522
  EMACS_INT last_window_start;
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

  /* Set nonzero whenever the narrowing is changed in this buffer.  */
  int clip_changed;

  /* If the long line scan cache is enabled (i.e. the buffer-local
     variable cache-long-line-scans is non-nil), newline_cache
     points to the newline cache, and width_run_cache points to the
     width run cache.

     The newline cache records which stretches of the buffer are
     known *not* to contain newlines, so that they can be skipped
     quickly when we search for newlines.

     The width run cache records which stretches of the buffer are
     known to contain characters whose widths are all the same.  If
     the width run cache maps a character to a value > 0, that value is
     the character's width; if it maps a character to zero, we don't
     know what its width is.  This allows compute_motion to process
     such regions very quickly, using algebra instead of inspecting
     each character.   See also width_table, below.  */
  struct region_cache *newline_cache;
  struct region_cache *width_run_cache;

  /* Non-zero means don't use redisplay optimizations for
     displaying this buffer.  */
  unsigned prevent_redisplay_optimizations_p : 1;

550 551 552 553 554 555 556 557
  /* List of overlays that end at or before the current center,
     in order of end-position.  */
  struct Lisp_Overlay *overlays_before;

  /* List of overlays that end after  the current center,
     in order of start-position.  */
  struct Lisp_Overlay *overlays_after;

558 559 560
  /* Position where the overlay lists are centered.  */
  EMACS_INT overlay_center;

561 562 563 564
  /* Everything from here down must be a Lisp_Object.  */
  /* buffer-local Lisp variables start at `undo_list',
     tho only the ones from `name' on are GC'd normally.  */

565 566 567 568 569 570 571 572 573
  /* Changes in the buffer are recorded here for undo.
     t means don't record anything.
     This information belongs to the base buffer of an indirect buffer,
     But we can't store it in the  struct buffer_text
     because local variables have to be right in the  struct buffer.
     So we copy it around in set_buffer_internal.
     This comes before `name' because it is marked in a special way.  */
  Lisp_Object undo_list;

574 575 576 577 578 579 580
  /* The name of this buffer.  */
  Lisp_Object name;

  /* The name of the file visited in this buffer, or nil.  */
  Lisp_Object filename;
  /* Dir for expanding relative file names.  */
  Lisp_Object directory;
Glenn Morris's avatar
Glenn Morris committed
581
  /* True if this buffer has been backed up (if you write to the
582 583 584 585 586
     visited file and it hasn't been backed up, then a backup will
     be made).  */
  /* This isn't really used by the C code, so could be deleted.  */
  Lisp_Object backed_up;
  /* Length of file when last read or saved.
587 588 589
     -1 means auto saving turned off because buffer shrank a lot.
     -2 means don't turn off auto saving if buffer shrinks.
       (That value is used with buffer-swap-text.)
590 591 592 593 594 595 596 597 598 599 600 601 602 603
     This is not in the  struct buffer_text
     because it's not used in indirect buffers at all.  */
  Lisp_Object save_length;
  /* File name used for auto-saving this buffer.
     This is not in the  struct buffer_text
     because it's not used in indirect buffers at all.  */
  Lisp_Object auto_save_file_name;

  /* Non-nil if buffer read-only.  */
  Lisp_Object read_only;
  /* "The mark".  This is a marker which may
     point into this buffer or may point nowhere.  */
  Lisp_Object mark;

604 605 606
  /* Alist of elements (SYMBOL . VALUE-IN-THIS-BUFFER) for all
     per-buffer variables of this buffer.  For locally unbound
     symbols, just the symbol appears as the element.  */
607 608 609 610 611 612 613 614
  Lisp_Object local_var_alist;

  /* Symbol naming major mode (eg, lisp-mode).  */
  Lisp_Object major_mode;
  /* Pretty name of major mode (eg, "Lisp"). */
  Lisp_Object mode_name;
  /* Mode line element that controls format of mode line.  */
  Lisp_Object mode_line_format;
615

616 617 618 619 620 621 622 623 624 625 626 627 628
  /* Analogous to mode_line_format for the line displayed at the top
     of windows.  Nil means don't display that line.  */
  Lisp_Object header_line_format;

  /* Keys that are bound local to this buffer.  */
  Lisp_Object keymap;
  /* This buffer's local abbrev table.  */
  Lisp_Object abbrev_table;
  /* This buffer's syntax table.  */
  Lisp_Object syntax_table;
  /* This buffer's category table.  */
  Lisp_Object category_table;

Pavel Janík's avatar
Pavel Janík committed
629
  /* Values of several buffer-local variables.  */
630
  /* tab-width is buffer-local so that redisplay can find it
Pavel Janík's avatar
Pavel Janík committed
631
     in buffers that are not current.  */
632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656
  Lisp_Object case_fold_search;
  Lisp_Object tab_width;
  Lisp_Object fill_column;
  Lisp_Object left_margin;
  /* Function to call when insert space past fill column.  */
  Lisp_Object auto_fill_function;
  /* nil: text, t: binary.
     This value is meaningful only on certain operating systems.  */
  /* Actually, we don't need this flag any more because end-of-line
     is handled correctly according to the buffer-file-coding-system
     of the buffer.  Just keeping it for backward compatibility.  */
  Lisp_Object buffer_file_type;

  /* Case table for case-conversion in this buffer.
     This char-table maps each char into its lower-case version.  */
  Lisp_Object downcase_table;
  /* Char-table mapping each char to its upper-case version.  */
  Lisp_Object upcase_table;
  /* Char-table for conversion for case-folding search.  */
  Lisp_Object case_canon_table;
  /* Char-table of equivalences for case-folding search.  */
  Lisp_Object case_eqv_table;

  /* Non-nil means do not display continuation lines.  */
  Lisp_Object truncate_lines;
657 658
  /* Non-nil means to use word wrapping when displaying continuation lines.  */
  Lisp_Object word_wrap;
659 660
  /* Non-nil means display ctl chars with uparrow.  */
  Lisp_Object ctl_arrow;
661 662 663 664 665 666
  /* Non-nil means reorder bidirectional text for display in the
     visual order.  */
  Lisp_Object bidi_display_reordering;
  /* Non-nil means set beginning of lines at the right edge of
     windows.  */
  Lisp_Object direction_reversed;
667 668 669
  /* If non-nil, specifies which direction of text to force in all the
     paragraphs of the buffer.  Nil means determine paragraph
     direction dynamically for each paragraph.  */
670
  Lisp_Object paragraph_direction;
671 672 673
  /* Non-nil means do selective display;
     see doc string in syms_of_buffer (buffer.c) for details.  */
  Lisp_Object selective_display;
Jim Blandy's avatar
Jim Blandy committed
674
#ifndef old
675 676
  /* Non-nil means show ... at end of line followed by invisible lines.  */
  Lisp_Object selective_display_ellipses;
Jim Blandy's avatar
Jim Blandy committed
677
#endif
678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697
  /* Alist of (FUNCTION . STRING) for each minor mode enabled in buffer.  */
  Lisp_Object minor_modes;
  /* t if "self-insertion" should overwrite; `binary' if it should also
     overwrite newlines and tabs - for editing executables and the like.  */
  Lisp_Object overwrite_mode;
  /* non-nil means abbrev mode is on.  Expand abbrevs automatically.  */
  Lisp_Object abbrev_mode;
  /* Display table to use for text in this buffer.  */
  Lisp_Object display_table;
  /* t means the mark and region are currently active.  */
  Lisp_Object mark_active;

  /* Non-nil means the buffer contents are regarded as multi-byte
     form of characters, not a binary code.  */
  Lisp_Object enable_multibyte_characters;

  /* Coding system to be used for encoding the buffer contents on
     saving.  */
  Lisp_Object buffer_file_coding_system;

Pavel Janík's avatar
Pavel Janík committed
698
  /* List of symbols naming the file format used for visited file.  */
699 700
  Lisp_Object file_format;

701 702 703
  /* List of symbols naming the file format used for auto-save file.  */
  Lisp_Object auto_save_file_format;

704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749
  /* True if the newline position cache and width run cache are
     enabled.  See search.c and indent.c.  */
  Lisp_Object cache_long_line_scans;

  /* If the width run cache is enabled, this table contains the
     character widths width_run_cache (see above) assumes.  When we
     do a thorough redisplay, we compare this against the buffer's
     current display table to see whether the display table has
     affected the widths of any characters.  If it has, we
     invalidate the width run cache, and re-initialize width_table.  */
  Lisp_Object width_table;

  /* In an indirect buffer, or a buffer that is the base of an
     indirect buffer, this holds a marker that records
     PT for this buffer when the buffer is not current.  */
  Lisp_Object pt_marker;

  /* In an indirect buffer, or a buffer that is the base of an
     indirect buffer, this holds a marker that records
     BEGV for this buffer when the buffer is not current.  */
  Lisp_Object begv_marker;

  /* In an indirect buffer, or a buffer that is the base of an
     indirect buffer, this holds a marker that records
     ZV for this buffer when the buffer is not current.  */
  Lisp_Object zv_marker;

  /* This holds the point value before the last scroll operation.
     Explicitly setting point sets this to nil.  */
  Lisp_Object point_before_scroll;

  /* Truename of the visited file, or nil.  */
  Lisp_Object file_truename;

  /* Invisibility spec of this buffer.
     t => any non-nil `invisible' property means invisible.
     A list => `invisible' property means invisible
     if it is memq in that list.  */
  Lisp_Object invisibility_spec;

  /* This is the last window that was selected with this buffer in it,
     or nil if that window no longer displays this buffer.  */
  Lisp_Object last_selected_window;

  /* Incremented each time the buffer is displayed in a window.  */
  Lisp_Object display_count;
750

751 752
  /* Widths of left and right marginal areas for windows displaying
     this buffer.  */
753 754 755 756 757 758 759 760 761 762 763 764 765
  Lisp_Object left_margin_cols, right_margin_cols;

  /* Widths of left and right fringe areas for windows displaying
     this buffer.  */
  Lisp_Object left_fringe_width, right_fringe_width;

  /* Non-nil means fringes are drawn outside display margins;
     othersize draw them between margin areas and text.  */
  Lisp_Object fringes_outside_margins;

  /* Width and type of scroll bar areas for windows displaying
     this buffer.  */
  Lisp_Object scroll_bar_width, vertical_scroll_bar_type;
766 767 768 769 770

  /* Non-nil means indicate lines not displaying text (in a style
     like vi).  */
  Lisp_Object indicate_empty_lines;

Kenichi Handa's avatar
Kenichi Handa committed
771 772 773
  /* Non-nil means indicate buffer boundaries and scrolling.  */
  Lisp_Object indicate_buffer_boundaries;

774 775 776 777 778 779
  /* Logical to physical fringe bitmap mappings.  */
  Lisp_Object fringe_indicator_alist;

  /* Logical to physical cursor bitmap mappings.  */
  Lisp_Object fringe_cursor_alist;

780 781 782 783 784 785 786 787
  /* Time stamp updated each time this buffer is displayed in a window.  */
  Lisp_Object display_time;

  /* If scrolling the display because point is below the bottom of a
     window showing this buffer, try to choose a window start so
     that point ends up this number of lines from the top of the
     window.  Nil means that scrolling method isn't used.  */
  Lisp_Object scroll_up_aggressively;
788

789 790 791 792 793
  /* If scrolling the display because point is above the top of a
     window showing this buffer, try to choose a window start so
     that point ends up this number of lines from the bottom of the
     window.  Nil means that scrolling method isn't used.  */
  Lisp_Object scroll_down_aggressively;
Gerd Moellmann's avatar
Gerd Moellmann committed
794

795 796 797 798 799 800 801
  /* Desired cursor type in this buffer.  See the doc string of
     per-buffer variable `cursor-type'.  */
  Lisp_Object cursor_type;

  /* An integer > 0 means put that number of pixels below text lines
     in the display of this buffer.  */
  Lisp_Object extra_line_spacing;
802 803 804 805 806

  /* *Cursor type to display in non-selected windows.
     t means to use hollow box cursor.
     See `cursor-type' for other values.  */
  Lisp_Object cursor_in_non_selected_windows;
807
};
808

809 810

/* This points to the current buffer.  */
Jim Blandy's avatar
Jim Blandy committed
811 812 813 814

extern struct buffer *current_buffer;

/* This structure holds the default values of the buffer-local variables
815
   that have special slots in each buffer.
Jim Blandy's avatar
Jim Blandy committed
816 817 818 819 820 821 822 823 824 825 826 827 828
   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.  */

extern struct buffer buffer_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,
829 830
   the entry for that slot (found in the same slot in this structure)
   is turned on in the buffer's local_flags array.
Jim Blandy's avatar
Jim Blandy committed
831 832

   If a slot in this structure is zero, then even though there may
833
   be a Lisp-level local variable for the slot, it has no default value,
Jim Blandy's avatar
Jim Blandy committed
834 835 836 837 838 839 840 841 842
   and the corresponding slot in buffer_defaults is not used.  */

extern struct buffer buffer_local_flags;

/* For each buffer slot, this points to the Lisp symbol name
   for that slot in the current buffer.  It is 0 for slots
   that don't have such names.  */

extern struct buffer buffer_local_symbols;
843

844
extern void delete_all_overlays P_ ((struct buffer *));
845
extern void reset_buffer P_ ((struct buffer *));
846
extern void evaporate_overlays P_ ((EMACS_INT));
847 848 849
extern int overlays_at P_ ((EMACS_INT pos, int extend, Lisp_Object **vec_ptr,
			    int *len_ptr, EMACS_INT *next_ptr,
			    EMACS_INT *prev_ptr, int change_req));
850
extern int sort_overlays P_ ((Lisp_Object *, int, struct window *));
851 852
extern void recenter_overlay_lists P_ ((struct buffer *, EMACS_INT));
extern int overlay_strings P_ ((EMACS_INT, struct window *, unsigned char **));
853 854 855 856 857
extern void validate_region P_ ((Lisp_Object *, Lisp_Object *));
extern void set_buffer_internal P_ ((struct buffer *));
extern void set_buffer_internal_1 P_ ((struct buffer *));
extern void set_buffer_temp P_ ((struct buffer *));
extern void record_buffer P_ ((Lisp_Object));
858
extern void buffer_slot_type_mismatch P_ ((Lisp_Object, int)) NO_RETURN;
859
extern void fix_overlays_before P_ ((struct buffer *, EMACS_INT, EMACS_INT));
Dave Love's avatar
Dave Love committed
860
extern void mmap_set_vars P_ ((int));
861

Kim F. Storm's avatar
Kim F. Storm committed
862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880
/* Get overlays at POSN into array OVERLAYS with NOVERLAYS elements.
   If NEXTP is non-NULL, return next overlay there.
   See overlay_at arg CHANGE_REQ for meaning of CHRQ arg.  */

#define GET_OVERLAYS_AT(posn, overlays, noverlays, nextp, chrq)		\
  do {									\
    int maxlen = 40;							\
    overlays = (Lisp_Object *) alloca (maxlen * sizeof (Lisp_Object));	\
    noverlays = overlays_at (posn, 0, &overlays, &maxlen,		\
			     nextp, NULL, chrq);				\
    if (noverlays > maxlen)						\
      {									\
	maxlen = noverlays;						\
	overlays = (Lisp_Object *) alloca (maxlen * sizeof (Lisp_Object)); \
	noverlays = overlays_at (posn, 0, &overlays, &maxlen,		\
				 nextp, NULL, chrq);			\
      }									\
  } while (0)

881
EXFUN (Fbuffer_list, 1);
Kenichi Handa's avatar
Kenichi Handa committed
882
EXFUN (Fbuffer_live_p, 1);
883 884 885 886
EXFUN (Fbuffer_name, 1);
EXFUN (Fget_file_buffer, 1);
EXFUN (Fnext_overlay_change, 1);
EXFUN (Fdelete_overlay, 1);
887
EXFUN (Fbuffer_local_value, 2);
888
EXFUN (Fgenerate_new_buffer_name, 2);
889

890
/* Functions to call before and after each text change.  */
891 892
extern Lisp_Object Vbefore_change_functions;
extern Lisp_Object Vafter_change_functions;
Jim Blandy's avatar
Jim Blandy committed
893
extern Lisp_Object Vfirst_change_hook;
894 895
extern Lisp_Object Qbefore_change_functions;
extern Lisp_Object Qafter_change_functions;
Jim Blandy's avatar
Jim Blandy committed
896
extern Lisp_Object Qfirst_change_hook;
Jim Blandy's avatar
Jim Blandy committed
897

898 899 900
/* If nonzero, all modification hooks are suppressed.  */
extern int inhibit_modification_hooks;

901 902
extern Lisp_Object Vdeactivate_mark;
extern Lisp_Object Vtransient_mark_mode;
903 904 905

/* Overlays */

906
/* 1 if the OV is an overlay object.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
907

Jim Blandy's avatar
Jim Blandy committed
908
#define OVERLAY_VALID(OV) (OVERLAYP (OV))
Jim Blandy's avatar
Jim Blandy committed
909

910
/* Return the marker that stands for where OV starts in the buffer.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
911

912
#define OVERLAY_START(OV) (XOVERLAY (OV)->start)
Jim Blandy's avatar
Jim Blandy committed
913

914
/* Return the marker that stands for where OV ends in the buffer.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
915

916
#define OVERLAY_END(OV) (XOVERLAY (OV)->end)
Jim Blandy's avatar
Jim Blandy committed
917

Gerd Moellmann's avatar
Gerd Moellmann committed
918 919 920 921
/* Return the plist of overlay OV.  */

#define OVERLAY_PLIST(OV) XOVERLAY ((OV))->plist

922 923
/* Return the actual buffer position for the marker P.
   We assume you know which buffer it's pointing into.  */
Jim Blandy's avatar
Jim Blandy committed
924

925
#define OVERLAY_POSITION(P) \
926
 (MARKERP (P) ? marker_position (P) : (abort (), 0))
Jim Blandy's avatar
Jim Blandy committed
927

928

929 930 931 932 933 934
/***********************************************************************
			Buffer-local Variables
 ***********************************************************************/

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

935
extern int last_per_buffer_idx;
936 937 938 939

/* Return the offset in bytes of member VAR of struct buffer
   from the start of a buffer structure.  */

940
#define PER_BUFFER_VAR_OFFSET(VAR) \
941 942 943 944 945 946 947 948
    ((char *) &buffer_local_flags.VAR - (char *) &buffer_local_flags)

/* Return the index of buffer-local variable VAR.  Each per-buffer
   variable has an index > 0 associated with it, except when it always
   has buffer-local values, in which case the index is -1.  If this is
   0, this is a bug and means that the slot of VAR in
   buffer_local_flags wasn't intiialized.  */

949 950
#define PER_BUFFER_VAR_IDX(VAR) \
    PER_BUFFER_IDX (PER_BUFFER_VAR_OFFSET (VAR))
951 952 953 954

/* Value is non-zero if the variable with index IDX has a local value
   in buffer B.  */

955 956
#define PER_BUFFER_VALUE_P(B, IDX)		\
    (((IDX) < 0 || IDX >= last_per_buffer_idx)	\
957 958 959 960 961 962
     ? (abort (), 0)				\
     : ((B)->local_flags[IDX] != 0))

/* Set whether per-buffer variable with index IDX has a buffer-local
   value in buffer B.  VAL zero means it hasn't.  */

963
#define SET_PER_BUFFER_VALUE_P(B, IDX, VAL)	\
964
     do {						\
965
       if ((IDX) < 0 || (IDX) >= last_per_buffer_idx)	\
966 967 968 969
	 abort ();					\
       (B)->local_flags[IDX] = (VAL);			\
     } while (0)

Kenichi Handa's avatar
Kenichi Handa committed
970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989
/* Return the index value of the per-buffer variable at offset OFFSET
   in the buffer structure.

   If the slot OFFSET has a corresponding default value in
   buffer_defaults, the index value is positive and has only one
   nonzero bit.  When a buffer has its own local value for a slot, the
   bit for that slot (found in the same slot in this structure) is
   turned on in the buffer's local_flags array.

   If the index value is -1, 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 the index value is -2, then there is no DEFVAR_PER_BUFFER for
   the slot, but there is a default value which is copied into each
   new buffer.

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

990

991
#define PER_BUFFER_IDX(OFFSET) \
992 993 994 995 996
      XINT (*(Lisp_Object *)((OFFSET) + (char *) &buffer_local_flags))

/* Return the default value of the per-buffer variable at offset
   OFFSET in the buffer structure.  */

997
#define PER_BUFFER_DEFAULT(OFFSET) \
998 999 1000 1001 1002
      (*(Lisp_Object *)((OFFSET) + (char *) &buffer_defaults))

/* Return the buffer-local value of the per-buffer variable at offset
   OFFSET in the buffer structure.  */

1003
#define PER_BUFFER_VALUE(BUFFER, OFFSET) \
1004 1005 1006 1007 1008
      (*(Lisp_Object *)((OFFSET) + (char *) (BUFFER)))

/* Return the symbol of the per-buffer variable at offset OFFSET in
   the buffer structure.  */

1009
#define PER_BUFFER_SYMBOL(OFFSET) \
1010 1011
      (*(Lisp_Object *)((OFFSET) + (char *) &buffer_local_symbols))

Kenichi Handa's avatar
Kenichi Handa committed
1012 1013
/* arch-tag: 679305dd-d41c-4a50-b170-3caf5c97b2d1
   (do not change this comment) */