buffer.h 40.2 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Header file for the buffer manipulation primitives.
Glenn Morris's avatar
Glenn Morris committed
2

3
Copyright (C) 1985-1986, 1993-1995, 1997-2011
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
#include <time.h> /* for time_t */
Jim Blandy's avatar
Jim Blandy committed
22

23
/* Accessing the parameters of the current buffer.  */
24

25 26
/* These macros come in pairs, one for the char position
   and one for the byte position.  */
Jim Blandy's avatar
Jim Blandy committed
27

28
/* Position of beginning of buffer.  */
Jim Blandy's avatar
Jim Blandy committed
29
#define BEG (1)
30
#define BEG_BYTE (BEG)
Jim Blandy's avatar
Jim Blandy committed
31

32
/* Position of beginning of accessible range of buffer.  */
33
#define BEGV (current_buffer->begv)
34
#define BEGV_BYTE (current_buffer->begv_byte)
Jim Blandy's avatar
Jim Blandy committed
35

36
/* Position of point in buffer.  The "+ 0" makes this
37
   not an l-value, so you can't assign to it.  Use SET_PT instead.  */
38
#define PT (current_buffer->pt + 0)
39
#define PT_BYTE (current_buffer->pt_byte + 0)
Jim Blandy's avatar
Jim Blandy committed
40

41
/* Position of gap in buffer.  */
42
#define GPT (current_buffer->text->gpt)
43
#define GPT_BYTE (current_buffer->text->gpt_byte)
Jim Blandy's avatar
Jim Blandy committed
44

45
/* Position of end of accessible range of buffer.  */
46
#define ZV (current_buffer->zv)
47
#define ZV_BYTE (current_buffer->zv_byte)
Jim Blandy's avatar
Jim Blandy committed
48

49
/* Position of end of buffer.  */
50
#define Z (current_buffer->text->z)
51
#define Z_BYTE (current_buffer->text->z_byte)
Jim Blandy's avatar
Jim Blandy committed
52

53
/* Macros for the addresses of places in the buffer.  */
Jim Blandy's avatar
Jim Blandy committed
54

55
/* Address of beginning of buffer.  */
56
#define BEG_ADDR (current_buffer->text->beg)
Jim Blandy's avatar
Jim Blandy committed
57

58
/* Address of beginning of accessible range of buffer.  */
59
#define BEGV_ADDR (BYTE_POS_ADDR (current_buffer->begv_byte))
Jim Blandy's avatar
Jim Blandy committed
60

61
/* Address of point in buffer.  */
62
#define PT_ADDR (BYTE_POS_ADDR (current_buffer->pt_byte))
Jim Blandy's avatar
Jim Blandy committed
63

64
/* Address of beginning of gap in buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
65
#define GPT_ADDR (current_buffer->text->beg + current_buffer->text->gpt_byte - BEG_BYTE)
Jim Blandy's avatar
Jim Blandy committed
66 67

/* Address of end of gap in buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
68
#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
69

70
/* Address of end of accessible range of buffer.  */
71
#define ZV_ADDR (BYTE_POS_ADDR (current_buffer->zv_byte))
72

73
/* Address of end of buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
74
#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
75 76

/* Size of gap.  */
77
#define GAP_SIZE (current_buffer->text->gap_size)
Jim Blandy's avatar
Jim Blandy committed
78

79 80 81 82 83 84
/* Is the current buffer narrowed?  */
#define NARROWED	((BEGV != BEG) || (ZV != Z))

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

85 86 87
/* Character modification count.  */
#define CHARS_MODIFF (current_buffer->text->chars_modiff)

88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104
/* 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
105 106
   Note that many of these evaluate the buffer argument more than once.  */

107
/* Position of beginning of buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
108 109
#define BUF_BEG(buf) (BEG)
#define BUF_BEG_BYTE(buf) (BEG_BYTE)
Jim Blandy's avatar
Jim Blandy committed
110

111 112
/* The BUF_BEGV[_BYTE], BUF_ZV[_BYTE], and BUF_PT[_BYTE] macros cannot
   be used for assignment; use SET_BUF_* macros below for that.  */
113

114
/* Position of beginning of accessible range of buffer.  */
115 116 117 118 119 120 121 122 123
#define BUF_BEGV(buf)					\
   (buf == current_buffer ? BEGV			\
    : NILP (BVAR (buf, begv_marker)) ? buf->begv	\
    : marker_position (BVAR (buf, begv_marker)))

#define BUF_BEGV_BYTE(buf)				\
   (buf == current_buffer ? BEGV_BYTE			\
    : NILP (BVAR (buf, begv_marker)) ? buf->begv_byte	\
    : marker_byte_position (BVAR (buf, begv_marker)))
Jim Blandy's avatar
Jim Blandy committed
124

125
/* Position of point in buffer.  */
126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145
#define BUF_PT(buf)					\
   (buf == current_buffer ? PT				\
    : NILP (BVAR (buf, pt_marker)) ? buf->pt		\
    : marker_position (BVAR (buf, pt_marker)))

#define BUF_PT_BYTE(buf)				\
   (buf == current_buffer ? PT_BYTE			\
    : NILP (BVAR (buf, pt_marker)) ? buf->pt_byte	\
    : marker_byte_position (BVAR (buf, pt_marker)))

/* Position of end of accessible range of buffer.  */
#define BUF_ZV(buf)					\
   (buf == current_buffer ? ZV				\
    : NILP (BVAR (buf, zv_marker)) ? buf->zv		\
    : marker_position (BVAR (buf, zv_marker)))

#define BUF_ZV_BYTE(buf)				\
   (buf == current_buffer ? ZV_BYTE			\
    : NILP (BVAR (buf, zv_marker)) ? buf->zv_byte	\
    : marker_byte_position (BVAR (buf, zv_marker)))
Jim Blandy's avatar
Jim Blandy committed
146

147
/* Position of gap in buffer.  */
148
#define BUF_GPT(buf) ((buf)->text->gpt)
149
#define BUF_GPT_BYTE(buf) ((buf)->text->gpt_byte)
Jim Blandy's avatar
Jim Blandy committed
150

151
/* Position of end of buffer.  */
152
#define BUF_Z(buf) ((buf)->text->z)
153 154 155 156 157 158
#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
159
#define BUF_GPT_ADDR(buf) ((buf)->text->beg + (buf)->text->gpt_byte - BEG_BYTE)
160 161

/* Address of end of buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
162
#define BUF_Z_ADDR(buf) ((buf)->text->beg + (buf)->text->gap_size + (buf)->text->z_byte - BEG_BYTE)
163 164

/* Address of end of gap in buffer.  */
Stefan Monnier's avatar
Stefan Monnier committed
165
#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
166

167 168 169 170
/* Size of gap.  */
#define BUF_GAP_SIZE(buf) ((buf)->text->gap_size)

/* Is this buffer narrowed?  */
171 172
#define BUF_NARROWED(buf) ((BUF_BEGV (buf) != BUF_BEG (buf)) \
			   || (BUF_ZV (buf) != BUF_Z (buf)))
173

Jim Blandy's avatar
Jim Blandy committed
174
/* Modification count.  */
175 176
#define BUF_MODIFF(buf) ((buf)->text->modiff)

177 178 179
/* Character modification count.  */
#define BUF_CHARS_MODIFF(buf) ((buf)->text->chars_modiff)

180 181 182
/* Modification count as of last visit or save.  */
#define BUF_SAVE_MODIFF(buf) ((buf)->text->save_modiff)

183 184 185
/* Overlay modification count.  */
#define BUF_OVERLAY_MODIFF(buf) ((buf)->text->overlay_modiff)

186 187 188 189
/* Modification count as of last auto-save.  */
/* FIXME: should we move this into ->text->auto_save_modiff?  */
#define BUF_AUTOSAVE_MODIFF(buf) ((buf)->auto_save_modified)

190 191 192 193 194
/* 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
195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217

#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									\
    {									\
218 219 220
      if (BUF_UNCHANGED_MODIFIED (buf) == BUF_MODIFF (buf)		\
	  && (BUF_OVERLAY_UNCHANGED_MODIFIED (buf)			\
	      == BUF_OVERLAY_MODIFF (buf)))				\
Gerd Moellmann's avatar
Gerd Moellmann committed
221 222 223 224 225 226 227 228 229 230 231 232 233
	{								\
	  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)
234

235

Pavel Janík's avatar
Pavel Janík committed
236
/* Macros to set PT in the current buffer, or another buffer.  */
Jim Blandy's avatar
Jim Blandy committed
237

238
#define SET_PT(position) (set_point (position))
239
#define TEMP_SET_PT(position) (temp_set_point (current_buffer, (position)))
Jim Blandy's avatar
Jim Blandy committed
240

241
#define SET_PT_BOTH(position, byte) (set_point_both (position, byte))
242 243
#define TEMP_SET_PT_BOTH(position, byte) \
  (temp_set_point_both (current_buffer, (position), (byte)))
244

245 246
#define BUF_TEMP_SET_PT(buffer, position) \
  (temp_set_point ((buffer), (position)))
247

Jan D's avatar
Jan D committed
248
extern void set_point (EMACS_INT);
249
extern void temp_set_point (struct buffer *, EMACS_INT);
Jan D's avatar
Jan D committed
250
extern void set_point_both (EMACS_INT, EMACS_INT);
251 252
extern void temp_set_point_both (struct buffer *,
				 EMACS_INT, EMACS_INT);
Jan D's avatar
Jan D committed
253
extern void enlarge_buffer_text (struct buffer *, EMACS_INT);
Jim Blandy's avatar
Jim Blandy committed
254

255 256 257 258 259 260 261 262

/* Macros for setting the BEGV, ZV or PT of a given buffer.

   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
263

264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288
#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
289
   and store the charpos in CHARPOS and the bytepos in BYTEPOS.  */
290 291

#define DECODE_POSITION(charpos, bytepos, pos)			\
292
do								\
293 294 295 296 297 298 299 300 301 302 303 304 305 306 307
  {								\
    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);	\
  }								\
308
while (0)
309

310 311 312 313 314
/* Maximum number of bytes in a buffer.
   A buffer cannot contain more bytes than a 1-origin fixnum can represent,
   nor can it be so large that C pointer arithmetic stops working.  */
#define BUF_BYTES_MAX min (MOST_POSITIVE_FIXNUM - 1, min (SIZE_MAX, PTRDIFF_MAX))

315 316 317
/* Return the address of byte position N in current buffer.  */

#define BYTE_POS_ADDR(n) \
Stefan Monnier's avatar
Stefan Monnier committed
318
  (((n) >= GPT_BYTE ? GAP_SIZE : 0) + (n) + BEG_ADDR - BEG_BYTE)
319 320 321 322 323 324

/* 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
325
   + BEG_ADDR - BEG_BYTE)
326 327 328 329 330 331 332 333 334 335 336 337 338 339 340

/* 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					    \
341
 - (ptr - (current_buffer)->text->beg <= GPT_BYTE - BEG_BYTE ? 0 : GAP_SIZE) \
Stefan Monnier's avatar
Stefan Monnier committed
342
 + BEG_BYTE)
343

344
/* Return character at byte position POS.  */
345 346

#define FETCH_CHAR(pos)				      	\
Tom Tromey's avatar
Tom Tromey committed
347
  (!NILP (BVAR (current_buffer, enable_multibyte_characters))	\
348 349 350 351 352 353 354 355 356 357
   ? 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;

358
/* Return character code of multi-byte form at byte position POS.  If POS
359 360 361 362 363
   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
364
			       + (pos) + BEG_ADDR - BEG_BYTE),	 	\
365
   STRING_CHAR (_fetch_multibyte_char_p))
366

367
/* Return character at byte position POS.  If the current buffer is unibyte
368 369 370 371
   and the character is not ASCII, make the returning character
   multibyte.  */

#define FETCH_CHAR_AS_MULTIBYTE(pos)			\
Tom Tromey's avatar
Tom Tromey committed
372
  (!NILP (BVAR (current_buffer, enable_multibyte_characters))	\
373
   ? FETCH_MULTIBYTE_CHAR ((pos))			\
374
   : UNIBYTE_TO_CHAR (FETCH_BYTE ((pos))))
375

376 377 378 379 380

/* Macros for accessing a character or byte,
   or converting between byte positions and addresses,
   in a specified buffer.  */

381
/* Return the address of character at byte position POS in buffer BUF.
Jim Blandy's avatar
Jim Blandy committed
382
   Note that both arguments can be computed more than once.  */
383 384

#define BUF_BYTE_ADDRESS(buf, pos) \
Stefan Monnier's avatar
Stefan Monnier committed
385
((buf)->text->beg + (pos) - BEG_BYTE		\
386 387
 + ((pos) >= (buf)->text->gpt_byte ? (buf)->text->gap_size : 0))

388
/* Return the address of character at char position POS in buffer BUF.
389 390 391
   Note that both arguments can be computed more than once.  */

#define BUF_CHAR_ADDRESS(buf, pos) \
Stefan Monnier's avatar
Stefan Monnier committed
392
((buf)->text->beg + buf_charpos_to_bytepos ((buf), (pos)) - BEG_BYTE	\
393
 + ((pos) >= (buf)->text->gpt ? (buf)->text->gap_size : 0))
Jim Blandy's avatar
Jim Blandy committed
394

395 396
/* Convert PTR, the address of a char in buffer BUF,
   into a character position.  */
397

398 399
#define BUF_PTR_BYTE_POS(buf, ptr)				\
((ptr) - (buf)->text->beg					\
400
 - (ptr - (buf)->text->beg <= BUF_GPT_BYTE (buf) - BEG_BYTE	\
401
    ? 0 : BUF_GAP_SIZE ((buf)))					\
Stefan Monnier's avatar
Stefan Monnier committed
402
 + BEG_BYTE)
403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422

/* 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
423
        + (pos) + BUF_BEG_ADDR (buf) - BEG_BYTE),			\
424
   STRING_CHAR (_fetch_multibyte_char_p))
Jim Blandy's avatar
Jim Blandy committed
425

426 427 428 429 430
/* 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
431 432
struct buffer_text
  {
433 434 435 436 437
    /* 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;
438

439 440 441 442 443
    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
444 445 446 447
    int modiff;			/* This counts buffer-modification events
				   for this buffer.  It is incremented for
				   each such event, and never otherwise
				   changed.  */
448 449 450 451
    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.  */
452 453 454
    int save_modiff;		/* Previous value of modiff, as of last
				   time buffer visited or saved a file.  */

455 456
    int overlay_modiff;		/* Counts modifications to overlays.  */

Gerd Moellmann's avatar
Gerd Moellmann committed
457
    /* Minimum value of GPT - BEG since last redisplay that finished.  */
458
    EMACS_INT beg_unchanged;
Gerd Moellmann's avatar
Gerd Moellmann committed
459 460

    /* Minimum value of Z - GPT since last redisplay that finished.  */
461
    EMACS_INT end_unchanged;
Gerd Moellmann's avatar
Gerd Moellmann committed
462 463 464 465 466 467 468 469 470 471

    /* 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
472 473
    /* Properties of this buffer's text.  */
    INTERVAL intervals;
474 475 476 477

    /* The markers that refer to this buffer.
       This is actually a single marker ---
       successive elements in its marker `chain'
478 479 480 481
       are the other markers referring to this buffer.
       This is a singly linked unordered list, which means that it's
       very cheap to add a marker to the list and it's also very cheap
       to move a marker within a buffer.  */
482
    struct Lisp_Marker *markers;
483 484

    /* Usually 0.  Temporarily set to 1 in decode_coding_gap to
485
       prevent Fgarbage_collect from shrinking the gap and losing
486 487
       not-yet-decoded bytes.  */
    int inhibit_shrinking;
Jim Blandy's avatar
Jim Blandy committed
488 489
  };

490
/* Lisp fields in struct buffer are hidden from most code and accessed
Tom Tromey's avatar
Tom Tromey committed
491
   via the BVAR macro, below.  Only select pieces of code, like the GC,
492 493 494 495 496
   are allowed to use BUFFER_INTERNAL_FIELD.  */
#define BUFFER_INTERNAL_FIELD(field) field ## _

/* Most code should use this macro to access Lisp fields in struct
   buffer.  */
Tom Tromey's avatar
Tom Tromey committed
497
#define BVAR(buf, field) ((buf)->BUFFER_INTERNAL_FIELD (field))
498

499 500
/* This is the structure that the buffer Lisp object points to.  */

Jim Blandy's avatar
Jim Blandy committed
501
struct buffer
502 503 504 505 506 507
{
  /* 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.  */

508 509
  /* HEADER.NEXT is the next buffer, in chain of all buffers,
     including killed buffers.
510 511 512 513
     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.  */
514
  struct vectorlike_header header;
515 516 517 518 519 520 521 522 523 524 525

  /* 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.  */
526
  EMACS_INT pt;
527
  /* Byte position of point in buffer.  */
528
  EMACS_INT pt_byte;
529
  /* Char position of beginning of accessible range.  */
530
  EMACS_INT begv;
531
  /* Byte position of beginning of accessible range.  */
532
  EMACS_INT begv_byte;
533
  /* Char position of end of accessible range.  */
534
  EMACS_INT zv;
535
  /* Byte position of end of accessible range.  */
536
  EMACS_INT zv_byte;
537 538 539 540 541 542 543 544 545 546

  /* 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.  */
547
#define MAX_PER_BUFFER_VARS 50
548
  char local_flags[MAX_PER_BUFFER_VARS];
549

550 551 552 553
  /* 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.  */
554
  time_t modtime;
555 556 557 558 559 560
  /* Size of the file when modtime was set.  This is used to detect the
     case where the file grew while we were reading it, so the modtime
     is still the same (since it's rounded up to seconds) but we're actually
     not up-to-date.  -1 means the size is unknown.  Only meaningful if
     modtime is actually set.  */
  EMACS_INT modtime_size;
561
  /* The value of text->modiff at the last auto-save.  */
562
  int auto_save_modified;
563 564 565
  /* The value of text->modiff at the last display error.
     Redisplay of this buffer is inhibited until it changes again.  */
  int display_error_modiff;
566 567 568 569 570
  /* 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.  */
571
  EMACS_INT last_window_start;
572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598

  /* 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;

599 600 601 602 603 604 605 606
  /* 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;

607 608 609
  /* Position where the overlay lists are centered.  */
  EMACS_INT overlay_center;

610 611 612 613
  /* 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.  */

614 615 616 617 618 619 620
  /* 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.  */
621
  Lisp_Object BUFFER_INTERNAL_FIELD (undo_list);
622

623
  /* The name of this buffer.  */
624
  Lisp_Object BUFFER_INTERNAL_FIELD (name);
625 626

  /* The name of the file visited in this buffer, or nil.  */
627
  Lisp_Object BUFFER_INTERNAL_FIELD (filename);
628
  /* Dir for expanding relative file names.  */
629
  Lisp_Object BUFFER_INTERNAL_FIELD (directory);
Glenn Morris's avatar
Glenn Morris committed
630
  /* True if this buffer has been backed up (if you write to the
631 632 633
     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.  */
634
  Lisp_Object BUFFER_INTERNAL_FIELD (backed_up);
635
  /* Length of file when last read or saved.
636 637 638
     -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.)
639 640
     This is not in the  struct buffer_text
     because it's not used in indirect buffers at all.  */
641
  Lisp_Object BUFFER_INTERNAL_FIELD (save_length);
642 643 644
  /* 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.  */
645
  Lisp_Object BUFFER_INTERNAL_FIELD (auto_save_file_name);
646 647

  /* Non-nil if buffer read-only.  */
648
  Lisp_Object BUFFER_INTERNAL_FIELD (read_only);
649 650
  /* "The mark".  This is a marker which may
     point into this buffer or may point nowhere.  */
651
  Lisp_Object BUFFER_INTERNAL_FIELD (mark);
652

653 654 655
  /* 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.  */
656
  Lisp_Object BUFFER_INTERNAL_FIELD (local_var_alist);
657 658

  /* Symbol naming major mode (eg, lisp-mode).  */
659
  Lisp_Object BUFFER_INTERNAL_FIELD (major_mode);
660
  /* Pretty name of major mode (eg, "Lisp"). */
661
  Lisp_Object BUFFER_INTERNAL_FIELD (mode_name);
662
  /* Mode line element that controls format of mode line.  */
663
  Lisp_Object BUFFER_INTERNAL_FIELD (mode_line_format);
664

665 666
  /* Analogous to mode_line_format for the line displayed at the top
     of windows.  Nil means don't display that line.  */
667
  Lisp_Object BUFFER_INTERNAL_FIELD (header_line_format);
668 669

  /* Keys that are bound local to this buffer.  */
670
  Lisp_Object BUFFER_INTERNAL_FIELD (keymap);
671
  /* This buffer's local abbrev table.  */
672
  Lisp_Object BUFFER_INTERNAL_FIELD (abbrev_table);
673
  /* This buffer's syntax table.  */
674
  Lisp_Object BUFFER_INTERNAL_FIELD (syntax_table);
675
  /* This buffer's category table.  */
676
  Lisp_Object BUFFER_INTERNAL_FIELD (category_table);
677

Pavel Janík's avatar
Pavel Janík committed
678
  /* Values of several buffer-local variables.  */
679
  /* tab-width is buffer-local so that redisplay can find it
Pavel Janík's avatar
Pavel Janík committed
680
     in buffers that are not current.  */
681 682 683 684
  Lisp_Object BUFFER_INTERNAL_FIELD (case_fold_search);
  Lisp_Object BUFFER_INTERNAL_FIELD (tab_width);
  Lisp_Object BUFFER_INTERNAL_FIELD (fill_column);
  Lisp_Object BUFFER_INTERNAL_FIELD (left_margin);
685
  /* Function to call when insert space past fill column.  */
686
  Lisp_Object BUFFER_INTERNAL_FIELD (auto_fill_function);
687 688 689

  /* Case table for case-conversion in this buffer.
     This char-table maps each char into its lower-case version.  */
690
  Lisp_Object BUFFER_INTERNAL_FIELD (downcase_table);
691
  /* Char-table mapping each char to its upper-case version.  */
692
  Lisp_Object BUFFER_INTERNAL_FIELD (upcase_table);
693
  /* Char-table for conversion for case-folding search.  */
694
  Lisp_Object BUFFER_INTERNAL_FIELD (case_canon_table);
695
  /* Char-table of equivalences for case-folding search.  */
696
  Lisp_Object BUFFER_INTERNAL_FIELD (case_eqv_table);
697 698

  /* Non-nil means do not display continuation lines.  */
699
  Lisp_Object BUFFER_INTERNAL_FIELD (truncate_lines);
700
  /* Non-nil means to use word wrapping when displaying continuation lines.  */
701
  Lisp_Object BUFFER_INTERNAL_FIELD (word_wrap);
702
  /* Non-nil means display ctl chars with uparrow.  */
703
  Lisp_Object BUFFER_INTERNAL_FIELD (ctl_arrow);
704 705
  /* Non-nil means reorder bidirectional text for display in the
     visual order.  */
706
  Lisp_Object BUFFER_INTERNAL_FIELD (bidi_display_reordering);
707 708 709
  /* 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.  */
710
  Lisp_Object BUFFER_INTERNAL_FIELD (bidi_paragraph_direction);
711 712
  /* Non-nil means do selective display;
     see doc string in syms_of_buffer (buffer.c) for details.  */
713
  Lisp_Object BUFFER_INTERNAL_FIELD (selective_display);
Jim Blandy's avatar
Jim Blandy committed
714
#ifndef old
715
  /* Non-nil means show ... at end of line followed by invisible lines.  */
716
  Lisp_Object BUFFER_INTERNAL_FIELD (selective_display_ellipses);
Jim Blandy's avatar
Jim Blandy committed
717
#endif
718
  /* Alist of (FUNCTION . STRING) for each minor mode enabled in buffer.  */
719
  Lisp_Object BUFFER_INTERNAL_FIELD (minor_modes);
720 721
  /* t if "self-insertion" should overwrite; `binary' if it should also
     overwrite newlines and tabs - for editing executables and the like.  */
722
  Lisp_Object BUFFER_INTERNAL_FIELD (overwrite_mode);
723
  /* non-nil means abbrev mode is on.  Expand abbrevs automatically.  */
724
  Lisp_Object BUFFER_INTERNAL_FIELD (abbrev_mode);
725
  /* Display table to use for text in this buffer.  */
726
  Lisp_Object BUFFER_INTERNAL_FIELD (display_table);
727
  /* t means the mark and region are currently active.  */
728
  Lisp_Object BUFFER_INTERNAL_FIELD (mark_active);
729 730 731

  /* Non-nil means the buffer contents are regarded as multi-byte
     form of characters, not a binary code.  */
732
  Lisp_Object BUFFER_INTERNAL_FIELD (enable_multibyte_characters);
733 734 735

  /* Coding system to be used for encoding the buffer contents on
     saving.  */
736
  Lisp_Object BUFFER_INTERNAL_FIELD (buffer_file_coding_system);
737

Pavel Janík's avatar
Pavel Janík committed
738
  /* List of symbols naming the file format used for visited file.  */
739
  Lisp_Object BUFFER_INTERNAL_FIELD (file_format);
740

741
  /* List of symbols naming the file format used for auto-save file.  */
742
  Lisp_Object BUFFER_INTERNAL_FIELD (auto_save_file_format);
743

744 745
  /* True if the newline position cache and width run cache are
     enabled.  See search.c and indent.c.  */
746
  Lisp_Object BUFFER_INTERNAL_FIELD (cache_long_line_scans);
747 748 749 750 751 752 753

  /* 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.  */
754
  Lisp_Object BUFFER_INTERNAL_FIELD (width_table);
755 756 757 758

  /* 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.  */
759
  Lisp_Object BUFFER_INTERNAL_FIELD (pt_marker);
760 761 762 763

  /* 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.  */
764
  Lisp_Object BUFFER_INTERNAL_FIELD (begv_marker);
765 766 767 768

  /* 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.  */
769
  Lisp_Object BUFFER_INTERNAL_FIELD (zv_marker);
770 771 772

  /* This holds the point value before the last scroll operation.
     Explicitly setting point sets this to nil.  */
773
  Lisp_Object BUFFER_INTERNAL_FIELD (point_before_scroll);
774 775

  /* Truename of the visited file, or nil.  */
776
  Lisp_Object BUFFER_INTERNAL_FIELD (file_truename);
777 778 779 780 781

  /* 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.  */
782
  Lisp_Object BUFFER_INTERNAL_FIELD (invisibility_spec);
783 784 785

  /* This is the last window that was selected with this buffer in it,
     or nil if that window no longer displays this buffer.  */
786
  Lisp_Object BUFFER_INTERNAL_FIELD (last_selected_window);
787 788

  /* Incremented each time the buffer is displayed in a window.  */
789
  Lisp_Object BUFFER_INTERNAL_FIELD (display_count);
790

791 792
  /* Widths of left and right marginal areas for windows displaying
     this buffer.  */
793
  Lisp_Object BUFFER_INTERNAL_FIELD (left_margin_cols), BUFFER_INTERNAL_FIELD (right_margin_cols);
794 795 796

  /* Widths of left and right fringe areas for windows displaying
     this buffer.  */
797
  Lisp_Object BUFFER_INTERNAL_FIELD (left_fringe_width), BUFFER_INTERNAL_FIELD (right_fringe_width);
798 799 800

  /* Non-nil means fringes are drawn outside display margins;
     othersize draw them between margin areas and text.  */
801
  Lisp_Object BUFFER_INTERNAL_FIELD (fringes_outside_margins);
802 803 804

  /* Width and type of scroll bar areas for windows displaying
     this buffer.  */
805
  Lisp_Object BUFFER_INTERNAL_FIELD (scroll_bar_width), BUFFER_INTERNAL_FIELD (vertical_scroll_bar_type);
806 807 808

  /* Non-nil means indicate lines not displaying text (in a style
     like vi).  */
809
  Lisp_Object BUFFER_INTERNAL_FIELD (indicate_empty_lines);
810

Kenichi Handa's avatar
Kenichi Handa committed
811
  /* Non-nil means indicate buffer boundaries and scrolling.  */
812
  Lisp_Object BUFFER_INTERNAL_FIELD (indicate_buffer_boundaries);
Kenichi Handa's avatar
Kenichi Handa committed
813

814
  /* Logical to physical fringe bitmap mappings.  */
815
  Lisp_Object BUFFER_INTERNAL_FIELD (fringe_indicator_alist);
816 817

  /* Logical to physical cursor bitmap mappings.  */
818
  Lisp_Object BUFFER_INTERNAL_FIELD (fringe_cursor_alist);
819

820
  /* Time stamp updated each time this buffer is displayed in a window.  */
821
  Lisp_Object BUFFER_INTERNAL_FIELD (display_time);
822 823 824 825 826

  /* 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.  */
827
  Lisp_Object BUFFER_INTERNAL_FIELD (scroll_up_aggressively);
828

829 830 831 832
  /* 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.  */
833
  Lisp_Object BUFFER_INTERNAL_FIELD (scroll_down_aggressively);
Gerd Moellmann's avatar
Gerd Moellmann committed
834

835 836
  /* Desired cursor type in this buffer.  See the doc string of
     per-buffer variable `cursor-type'.  */
837
  Lisp_Object BUFFER_INTERNAL_FIELD (cursor_type);
838 839 840

  /* An integer > 0 means put that number of pixels below text lines
     in the display of this buffer.  */
841
  Lisp_Object BUFFER_INTERNAL_FIELD (extra_line_spacing);
842 843 844 845

  /* *Cursor type to display in non-selected windows.
     t means to use hollow box cursor.
     See `cursor-type' for other values.  */
846
  Lisp_Object BUFFER_INTERNAL_FIELD (cursor_in_non_selected_windows);
847
};
848

849 850

/* This points to the current buffer.  */
Jim Blandy's avatar
Jim Blandy committed
851 852 853 854

extern struct buffer *current_buffer;

/* This structure holds the default values of the buffer-local variables
855
   that have special slots in each buffer.
Jim Blandy's avatar
Jim Blandy committed
856 857 858 859 860 861 862 863 864 865 866 867 868
   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,
869 870
   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
871 872

   If a slot in this structure is zero, then even though there may
873
   be a Lisp-level local variable for the slot, it has no default value,
Jim Blandy's avatar
Jim Blandy committed
874 875
   and the corresponding slot in buffer_defaults is not used.  */

876

Jim Blandy's avatar
Jim Blandy committed
877 878 879 880 881 882 883
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;
884

Jan D's avatar
Jan D committed
885 886 887 888 889 890 891 892
extern void delete_all_overlays (struct buffer *);
extern void reset_buffer (struct buffer *);
extern void evaporate_overlays (EMACS_INT);
extern int overlays_at (EMACS_INT pos, int extend, Lisp_Object **vec_ptr,
                        int *len_ptr, EMACS_INT *next_ptr,
                        EMACS_INT *prev_ptr, int change_req);
extern int sort_overlays (Lisp_Object *, int, struct window *);
extern void recenter_overlay_lists (struct buffer *, EMACS_INT);
893
extern EMACS_INT overlay_strings (EMACS_INT, struct window *, unsigned char **);
Jan D's avatar
Jan D committed
894 895 896 897 898 899 900 901
extern void validate_region (Lisp_Object *, Lisp_Object *);
extern void set_buffer_internal (struct buffer *);
extern void set_buffer_internal_1 (struct buffer *);
extern void set_buffer_temp (struct buffer *);
extern void record_buffer (Lisp_Object);
extern void buffer_slot_type_mismatch (Lisp_Object, int) NO_RETURN;
extern void fix_overlays_before (struct buffer *, EMACS_INT, EMACS_INT);
extern void mmap_set_vars (int);
902

Kim F. Storm's avatar
Kim F. Storm committed
903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921
/* 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)

Kenichi Handa's avatar
Kenichi Handa committed
922
EXFUN (Fbuffer_live_p, 1);
923 924
EXFUN (Fbuffer_name, 1);
EXFUN (Fnext_overlay_change, 1);
925
EXFUN (Fbuffer_local_value, 2);
926

927 928
extern Lisp_Object Qbefore_change_functions;
extern Lisp_Object Qafter_change_functions;
Jim Blandy's avatar
Jim Blandy committed
929
extern Lisp_Object Qfirst_change_hook;
Jim Blandy's avatar
Jim Blandy committed