Commit | Line | Data |
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b3ec245a | 1 | /* Header file for the buffer manipulation primitives. |
bac40480 | 2 | Copyright (C) 1985, 86, 93, 94, 95, 97, 1998, 1999, 2000 Free Software Foundation, Inc. |
b3ec245a JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
fbfed6f0 | 8 | the Free Software Foundation; either version 2, or (at your option) |
b3ec245a JB |
9 | any later version. |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
b3ec245a JB |
20 | |
21 | ||
69f9064e | 22 | /* Accessing the parameters of the current buffer. */ |
1b92beaf | 23 | |
69f9064e RS |
24 | /* These macros come in pairs, one for the char position |
25 | and one for the byte position. */ | |
b3ec245a | 26 | |
69f9064e | 27 | /* Position of beginning of buffer. */ |
b3ec245a | 28 | #define BEG (1) |
69f9064e | 29 | #define BEG_BYTE (1) |
b3ec245a | 30 | |
69f9064e | 31 | /* Position of beginning of accessible range of buffer. */ |
c1ea566e | 32 | #define BEGV (current_buffer->begv) |
69f9064e | 33 | #define BEGV_BYTE (current_buffer->begv_byte) |
b3ec245a | 34 | |
69f9064e | 35 | /* Position of point in buffer. The "+ 0" makes this |
b3ec245a | 36 | not an l-value, so you can't assign to it. Use SET_PT instead. */ |
c1ea566e | 37 | #define PT (current_buffer->pt + 0) |
69f9064e | 38 | #define PT_BYTE (current_buffer->pt_byte + 0) |
b3ec245a | 39 | |
69f9064e | 40 | /* Position of gap in buffer. */ |
c1ea566e | 41 | #define GPT (current_buffer->text->gpt) |
69f9064e | 42 | #define GPT_BYTE (current_buffer->text->gpt_byte) |
b3ec245a | 43 | |
69f9064e | 44 | /* Position of end of accessible range of buffer. */ |
c1ea566e | 45 | #define ZV (current_buffer->zv) |
69f9064e | 46 | #define ZV_BYTE (current_buffer->zv_byte) |
b3ec245a | 47 | |
69f9064e | 48 | /* Position of end of buffer. */ |
c1ea566e | 49 | #define Z (current_buffer->text->z) |
69f9064e | 50 | #define Z_BYTE (current_buffer->text->z_byte) |
b3ec245a | 51 | |
69f9064e | 52 | /* Macros for the addresses of places in the buffer. */ |
b3ec245a JB |
53 | |
54 | /* Address of beginning of buffer. */ | |
c1ea566e | 55 | #define BEG_ADDR (current_buffer->text->beg) |
b3ec245a JB |
56 | |
57 | /* Address of beginning of accessible range of buffer. */ | |
69f9064e | 58 | #define BEGV_ADDR (BYTE_POS_ADDR (current_buffer->begv_byte)) |
b3ec245a JB |
59 | |
60 | /* Address of point in buffer. */ | |
69f9064e | 61 | #define PT_ADDR (BYTE_POS_ADDR (current_buffer->pt_byte)) |
b3ec245a JB |
62 | |
63 | /* Address of beginning of gap in buffer. */ | |
69f9064e | 64 | #define GPT_ADDR (current_buffer->text->beg + current_buffer->text->gpt_byte - 1) |
b3ec245a JB |
65 | |
66 | /* Address of end of gap in buffer. */ | |
69f9064e | 67 | #define GAP_END_ADDR (current_buffer->text->beg + current_buffer->text->gpt_byte + current_buffer->text->gap_size - 1) |
b3ec245a JB |
68 | |
69 | /* Address of end of accessible range of buffer. */ | |
69f9064e | 70 | #define ZV_ADDR (BYTE_POS_ADDR (current_buffer->zv_byte)) |
96b65d4e KH |
71 | |
72 | /* Address of end of buffer. */ | |
69f9064e | 73 | #define Z_ADDR (current_buffer->text->beg + current_buffer->text->gap_size + current_buffer->text->z_byte - 1) |
b3ec245a JB |
74 | |
75 | /* Size of gap. */ | |
c1ea566e | 76 | #define GAP_SIZE (current_buffer->text->gap_size) |
b3ec245a | 77 | |
69f9064e RS |
78 | /* Is the current buffer narrowed? */ |
79 | #define NARROWED ((BEGV != BEG) || (ZV != Z)) | |
80 | ||
81 | /* Modification count. */ | |
82 | #define MODIFF (current_buffer->text->modiff) | |
83 | ||
84 | /* Overlay modification count. */ | |
85 | #define OVERLAY_MODIFF (current_buffer->text->overlay_modiff) | |
86 | ||
87 | /* Modification count as of last visit or save. */ | |
88 | #define SAVE_MODIFF (current_buffer->text->save_modiff) | |
89 | ||
90 | /* BUFFER_CEILING_OF (resp. BUFFER_FLOOR_OF), when applied to n, return | |
91 | the max (resp. min) p such that | |
92 | ||
93 | BYTE_POS_ADDR (p) - BYTE_POS_ADDR (n) == p - n */ | |
94 | ||
95 | #define BUFFER_CEILING_OF(BYTEPOS) \ | |
96 | (((BYTEPOS) < GPT_BYTE && GPT < ZV ? GPT_BYTE : ZV_BYTE) - 1) | |
97 | #define BUFFER_FLOOR_OF(BYTEPOS) \ | |
98 | (BEGV <= GPT && GPT_BYTE <= (BYTEPOS) ? GPT_BYTE : BEGV_BYTE) | |
99 | \f | |
100 | /* Similar macros to operate on a specified buffer. | |
b3ec245a JB |
101 | Note that many of these evaluate the buffer argument more than once. */ |
102 | ||
69f9064e | 103 | /* Position of beginning of buffer. */ |
b3ec245a | 104 | #define BUF_BEG(buf) (1) |
69f9064e | 105 | #define BUF_BEG_BYTE(buf) (1) |
b3ec245a | 106 | |
69f9064e | 107 | /* Position of beginning of accessible range of buffer. */ |
c1ea566e | 108 | #define BUF_BEGV(buf) ((buf)->begv) |
69f9064e | 109 | #define BUF_BEGV_BYTE(buf) ((buf)->begv_byte) |
b3ec245a | 110 | |
69f9064e | 111 | /* Position of point in buffer. */ |
c1ea566e | 112 | #define BUF_PT(buf) ((buf)->pt) |
69f9064e | 113 | #define BUF_PT_BYTE(buf) ((buf)->pt_byte) |
b3ec245a | 114 | |
69f9064e | 115 | /* Position of gap in buffer. */ |
c1ea566e | 116 | #define BUF_GPT(buf) ((buf)->text->gpt) |
69f9064e | 117 | #define BUF_GPT_BYTE(buf) ((buf)->text->gpt_byte) |
b3ec245a | 118 | |
69f9064e | 119 | /* Position of end of accessible range of buffer. */ |
c1ea566e | 120 | #define BUF_ZV(buf) ((buf)->zv) |
69f9064e | 121 | #define BUF_ZV_BYTE(buf) ((buf)->zv_byte) |
b3ec245a | 122 | |
69f9064e | 123 | /* Position of end of buffer. */ |
c1ea566e | 124 | #define BUF_Z(buf) ((buf)->text->z) |
69f9064e RS |
125 | #define BUF_Z_BYTE(buf) ((buf)->text->z_byte) |
126 | ||
127 | /* Address of beginning of buffer. */ | |
128 | #define BUF_BEG_ADDR(buf) ((buf)->text->beg) | |
129 | ||
130 | /* Address of beginning of gap of buffer. */ | |
131 | #define BUF_GPT_ADDR(buf) ((buf)->text->beg + (buf)->text->gpt_byte - 1) | |
132 | ||
133 | /* Address of end of buffer. */ | |
134 | #define BUF_Z_ADDR(buf) ((buf)->text->beg + (buf)->text->gap_size + (buf)->text->z_byte - 1) | |
135 | ||
136 | /* Address of end of gap in buffer. */ | |
137 | #define BUF_GAP_END_ADDR(buf) ((buf)->text->beg + (buf)->text->gpt_byte + (buf)->text->gap_size - 1) | |
b3ec245a | 138 | |
69f9064e RS |
139 | /* Size of gap. */ |
140 | #define BUF_GAP_SIZE(buf) ((buf)->text->gap_size) | |
141 | ||
142 | /* Is this buffer narrowed? */ | |
c1ea566e RS |
143 | #define BUF_NARROWED(buf) ((BUF_BEGV (buf) != BUF_BEG (buf)) \ |
144 | || (BUF_ZV (buf) != BUF_Z (buf))) | |
e12f3519 | 145 | |
b3ec245a | 146 | /* Modification count. */ |
c1ea566e RS |
147 | #define BUF_MODIFF(buf) ((buf)->text->modiff) |
148 | ||
149 | /* Modification count as of last visit or save. */ | |
150 | #define BUF_SAVE_MODIFF(buf) ((buf)->text->save_modiff) | |
151 | ||
2e50b9cc RS |
152 | /* Overlay modification count. */ |
153 | #define BUF_OVERLAY_MODIFF(buf) ((buf)->text->overlay_modiff) | |
154 | ||
c1ea566e RS |
155 | /* Interval tree of buffer. */ |
156 | #define BUF_INTERVALS(buf) ((buf)->text->intervals) | |
157 | ||
158 | /* Marker chain of buffer. */ | |
159 | #define BUF_MARKERS(buf) ((buf)->text->markers) | |
133a3962 GM |
160 | |
161 | #define BUF_UNCHANGED_MODIFIED(buf) \ | |
162 | ((buf)->text->unchanged_modified) | |
163 | ||
164 | #define BUF_OVERLAY_UNCHANGED_MODIFIED(buf) \ | |
165 | ((buf)->text->overlay_unchanged_modified) | |
166 | #define BUF_BEG_UNCHANGED(buf) ((buf)->text->beg_unchanged) | |
167 | #define BUF_END_UNCHANGED(buf) ((buf)->text->end_unchanged) | |
168 | ||
169 | #define UNCHANGED_MODIFIED \ | |
170 | BUF_UNCHANGED_MODIFIED (current_buffer) | |
171 | #define OVERLAY_UNCHANGED_MODIFIED \ | |
172 | BUF_OVERLAY_UNCHANGED_MODIFIED (current_buffer) | |
173 | #define BEG_UNCHANGED BUF_BEG_UNCHANGED (current_buffer) | |
174 | #define END_UNCHANGED BUF_END_UNCHANGED (current_buffer) | |
175 | ||
176 | /* Compute how many characters at the top and bottom of BUF are | |
177 | unchanged when the range START..END is modified. This computation | |
178 | must be done each time BUF is modified. */ | |
179 | ||
180 | #define BUF_COMPUTE_UNCHANGED(buf, start, end) \ | |
181 | do \ | |
182 | { \ | |
183 | if (BUF_UNCHANGED_MODIFIED (buf) == MODIFF \ | |
184 | && BUF_OVERLAY_UNCHANGED_MODIFIED (buf) == OVERLAY_MODIFF) \ | |
185 | { \ | |
186 | BUF_BEG_UNCHANGED (buf) = (start) - BUF_BEG (buf); \ | |
187 | BUF_END_UNCHANGED (buf) = BUF_Z (buf) - (end); \ | |
188 | } \ | |
189 | else \ | |
190 | { \ | |
191 | if (BUF_Z (buf) - (end) < BUF_END_UNCHANGED (buf)) \ | |
192 | BUF_END_UNCHANGED (buf) = BUF_Z (buf) - (end); \ | |
193 | if ((start) - BUF_BEG (buf) < BUF_BEG_UNCHANGED (buf)) \ | |
194 | BUF_BEG_UNCHANGED (buf) = (start) - BUF_BEG (buf); \ | |
195 | } \ | |
196 | } \ | |
197 | while (0) | |
198 | ||
69f9064e RS |
199 | \f |
200 | /* Macros to set PT in the current buffer, or another buffer.. */ | |
b3ec245a | 201 | |
69f9064e RS |
202 | #define SET_PT(position) (set_point (current_buffer, (position))) |
203 | #define TEMP_SET_PT(position) (temp_set_point (current_buffer, (position))) | |
b3ec245a | 204 | |
69f9064e RS |
205 | #define SET_PT_BOTH(position, byte) \ |
206 | (set_point_both (current_buffer, (position), (byte))) | |
207 | #define TEMP_SET_PT_BOTH(position, byte) \ | |
208 | (temp_set_point_both (current_buffer, (position), (byte))) | |
96b65d4e | 209 | |
69f9064e RS |
210 | #define BUF_SET_PT(buffer, position) \ |
211 | (set_point ((buffer), (position))) | |
212 | #define BUF_TEMP_SET_PT(buffer, position) \ | |
213 | (temp_set_point ((buffer), (position))) | |
96b65d4e | 214 | |
69f9064e RS |
215 | extern void set_point P_ ((struct buffer *, int)); |
216 | extern INLINE void temp_set_point P_ ((struct buffer *, int)); | |
217 | extern void set_point_both P_ ((struct buffer *, int, int)); | |
218 | extern INLINE void temp_set_point_both P_ ((struct buffer *, int, int)); | |
39c75ccb | 219 | extern void enlarge_buffer_text P_ ((struct buffer *, int)); |
b3ec245a | 220 | |
69f9064e RS |
221 | \f |
222 | /* Macros for setting the BEGV, ZV or PT of a given buffer. | |
223 | ||
224 | SET_BUF_PT* seet to be redundant. Get rid of them? | |
225 | ||
226 | The ..._BOTH macros take both a charpos and a bytepos, | |
227 | which must correspond to each other. | |
228 | ||
229 | The macros without ..._BOTH take just a charpos, | |
230 | and compute the bytepos from it. */ | |
b3ec245a | 231 | |
69f9064e RS |
232 | #define SET_BUF_BEGV(buf, charpos) \ |
233 | ((buf)->begv_byte = buf_charpos_to_bytepos ((buf), (charpos)), \ | |
234 | (buf)->begv = (charpos)) | |
235 | ||
236 | #define SET_BUF_ZV(buf, charpos) \ | |
237 | ((buf)->zv_byte = buf_charpos_to_bytepos ((buf), (charpos)), \ | |
238 | (buf)->zv = (charpos)) | |
239 | ||
240 | #define SET_BUF_BEGV_BOTH(buf, charpos, byte) \ | |
241 | ((buf)->begv = (charpos), \ | |
242 | (buf)->begv_byte = (byte)) | |
243 | ||
244 | #define SET_BUF_ZV_BOTH(buf, charpos, byte) \ | |
245 | ((buf)->zv = (charpos), \ | |
246 | (buf)->zv_byte = (byte)) | |
247 | ||
248 | #define SET_BUF_PT_BOTH(buf, charpos, byte) \ | |
249 | ((buf)->pt = (charpos), \ | |
250 | (buf)->pt_byte = (byte)) | |
251 | \f | |
252 | /* Macros to access a character or byte in the current buffer, | |
253 | or convert between a byte position and an address. | |
254 | These macros do not check that the position is in range. */ | |
255 | ||
256 | /* Access a Lisp position value in POS, | |
8b4baa7b | 257 | and store the charpos in CHARPOS and the bytepos in BYTEPOS. */ |
69f9064e RS |
258 | |
259 | #define DECODE_POSITION(charpos, bytepos, pos) \ | |
260 | if (1) \ | |
261 | { \ | |
262 | Lisp_Object __pos = (pos); \ | |
263 | if (NUMBERP (__pos)) \ | |
264 | { \ | |
265 | charpos = __pos; \ | |
266 | bytepos = buf_charpos_to_bytepos (current_buffer, __pos); \ | |
267 | } \ | |
268 | else if (MARKERP (__pos)) \ | |
269 | { \ | |
270 | charpos = marker_position (__pos); \ | |
271 | bytepos = marker_byte_position (__pos); \ | |
272 | } \ | |
273 | else \ | |
274 | wrong_type_argument (Qinteger_or_marker_p, __pos); \ | |
275 | } \ | |
276 | else | |
277 | ||
278 | /* Return the address of byte position N in current buffer. */ | |
279 | ||
280 | #define BYTE_POS_ADDR(n) \ | |
281 | (((n) >= GPT_BYTE ? GAP_SIZE : 0) + (n) + BEG_ADDR - 1) | |
282 | ||
283 | /* Return the address of char position N. */ | |
284 | ||
285 | #define CHAR_POS_ADDR(n) \ | |
286 | (((n) >= GPT ? GAP_SIZE : 0) \ | |
287 | + buf_charpos_to_bytepos (current_buffer, n) \ | |
288 | + BEG_ADDR - 1) | |
289 | ||
290 | /* Convert a character position to a byte position. */ | |
291 | ||
292 | #define CHAR_TO_BYTE(charpos) \ | |
293 | (buf_charpos_to_bytepos (current_buffer, charpos)) | |
294 | ||
295 | /* Convert a byte position to a character position. */ | |
296 | ||
297 | #define BYTE_TO_CHAR(bytepos) \ | |
298 | (buf_bytepos_to_charpos (current_buffer, bytepos)) | |
299 | ||
300 | /* Convert PTR, the address of a byte in the buffer, into a byte position. */ | |
301 | ||
302 | #define PTR_BYTE_POS(ptr) \ | |
303 | ((ptr) - (current_buffer)->text->beg \ | |
304 | - (ptr - (current_buffer)->text->beg < (unsigned) GPT_BYTE ? 0 : GAP_SIZE) \ | |
305 | + 1) | |
306 | ||
307 | /* Return character at position POS. */ | |
308 | ||
309 | #define FETCH_CHAR(pos) \ | |
310 | (!NILP (current_buffer->enable_multibyte_characters) \ | |
311 | ? FETCH_MULTIBYTE_CHAR ((pos)) \ | |
312 | : FETCH_BYTE ((pos))) | |
313 | ||
314 | /* Return the byte at byte position N. */ | |
315 | ||
316 | #define FETCH_BYTE(n) *(BYTE_POS_ADDR ((n))) | |
317 | ||
318 | /* Variables used locally in FETCH_MULTIBYTE_CHAR. */ | |
319 | extern unsigned char *_fetch_multibyte_char_p; | |
320 | extern int _fetch_multibyte_char_len; | |
321 | ||
322 | /* Return character code of multi-byte form at position POS. If POS | |
323 | doesn't point the head of valid multi-byte form, only the byte at | |
324 | POS is returned. No range checking. */ | |
325 | ||
326 | #define FETCH_MULTIBYTE_CHAR(pos) \ | |
327 | (_fetch_multibyte_char_p = (((pos) >= GPT_BYTE ? GAP_SIZE : 0) \ | |
328 | + (pos) + BEG_ADDR - 1), \ | |
329 | _fetch_multibyte_char_len \ | |
330 | = ((pos) >= GPT_BYTE ? ZV_BYTE : GPT_BYTE) - (pos), \ | |
331 | STRING_CHAR (_fetch_multibyte_char_p, _fetch_multibyte_char_len)) | |
332 | \f | |
333 | /* Macros for accessing a character or byte, | |
334 | or converting between byte positions and addresses, | |
335 | in a specified buffer. */ | |
336 | ||
337 | /* Return the address of character at byte position POS in buffer BUF. | |
b3ec245a | 338 | Note that both arguments can be computed more than once. */ |
69f9064e RS |
339 | |
340 | #define BUF_BYTE_ADDRESS(buf, pos) \ | |
c1ea566e | 341 | ((buf)->text->beg + (pos) - 1 \ |
69f9064e RS |
342 | + ((pos) >= (buf)->text->gpt_byte ? (buf)->text->gap_size : 0)) |
343 | ||
344 | /* Return the address of character at char position POS in buffer BUF. | |
345 | Note that both arguments can be computed more than once. */ | |
346 | ||
347 | #define BUF_CHAR_ADDRESS(buf, pos) \ | |
348 | ((buf)->text->beg + buf_charpos_to_bytepos ((buf), (pos)) - 1 \ | |
c1ea566e | 349 | + ((pos) >= (buf)->text->gpt ? (buf)->text->gap_size : 0)) |
b3ec245a | 350 | |
69f9064e RS |
351 | /* Convert PTR, the address of a char in buffer BUF, |
352 | into a character position. */ | |
790f39e7 | 353 | |
69f9064e RS |
354 | #define BUF_PTR_BYTE_POS(buf, ptr) \ |
355 | ((ptr) - (buf)->text->beg \ | |
356 | - (ptr - (buf)->text->beg < (unsigned) BUF_GPT_BYTE ((buf)) \ | |
357 | ? 0 : BUF_GAP_SIZE ((buf))) \ | |
790f39e7 | 358 | + 1) |
69f9064e RS |
359 | |
360 | /* Return the character at byte position POS in buffer BUF. */ | |
361 | ||
362 | #define BUF_FETCH_CHAR(buf, pos) \ | |
363 | (!NILP (buf->enable_multibyte_characters) \ | |
364 | ? BUF_FETCH_MULTIBYTE_CHAR ((buf), (pos)) \ | |
365 | : BUF_FETCH_BYTE ((buf), (pos))) | |
366 | ||
367 | /* Return the byte at byte position N in buffer BUF. */ | |
368 | ||
369 | #define BUF_FETCH_BYTE(buf, n) \ | |
370 | *(BUF_BYTE_ADDRESS ((buf), (n))) | |
371 | ||
372 | /* Return character code of multi-byte form at byte position POS in BUF. | |
373 | If POS doesn't point the head of valid multi-byte form, only the byte at | |
374 | POS is returned. No range checking. */ | |
375 | ||
376 | #define BUF_FETCH_MULTIBYTE_CHAR(buf, pos) \ | |
377 | (_fetch_multibyte_char_p \ | |
378 | = (((pos) >= BUF_GPT_BYTE (buf) ? BUF_GAP_SIZE (buf) : 0) \ | |
379 | + (pos) + BUF_BEG_ADDR (buf) - 1), \ | |
380 | _fetch_multibyte_char_len \ | |
381 | = (((pos) >= BUF_GPT_BYTE (buf) ? BUF_ZV_BYTE (buf) : BUF_GPT_BYTE (buf)) \ | |
382 | - (pos)), \ | |
383 | STRING_CHAR (_fetch_multibyte_char_p, _fetch_multibyte_char_len)) | |
b3ec245a | 384 | \f |
69f9064e RS |
385 | /* Define the actual buffer data structures. */ |
386 | ||
387 | /* This data structure describes the actual text contents of a buffer. | |
388 | It is shared between indirect buffers and their base buffer. */ | |
389 | ||
b3ec245a JB |
390 | struct buffer_text |
391 | { | |
0afdfe38 GM |
392 | /* Actual address of buffer contents. If REL_ALLOC is defined, |
393 | this address might change when blocks are relocated which can | |
394 | e.g. happen when malloc is called. So, don't pass a pointer | |
395 | into a buffer's text to functions that malloc. */ | |
396 | unsigned char *beg; | |
397 | ||
69f9064e RS |
398 | int gpt; /* Char pos of gap in buffer. */ |
399 | int z; /* Char pos of end of buffer. */ | |
400 | int gpt_byte; /* Byte pos of gap in buffer. */ | |
401 | int z_byte; /* Byte pos of end of buffer. */ | |
c1ea566e | 402 | int gap_size; /* Size of buffer's gap. */ |
b3ec245a JB |
403 | int modiff; /* This counts buffer-modification events |
404 | for this buffer. It is incremented for | |
405 | each such event, and never otherwise | |
406 | changed. */ | |
c1ea566e RS |
407 | int save_modiff; /* Previous value of modiff, as of last |
408 | time buffer visited or saved a file. */ | |
409 | ||
2e50b9cc RS |
410 | int overlay_modiff; /* Counts modifications to overlays. */ |
411 | ||
133a3962 GM |
412 | /* Minimum value of GPT - BEG since last redisplay that finished. */ |
413 | int beg_unchanged; | |
414 | ||
415 | /* Minimum value of Z - GPT since last redisplay that finished. */ | |
416 | int end_unchanged; | |
417 | ||
418 | /* MODIFF as of last redisplay that finished; if it matches MODIFF, | |
419 | beg_unchanged and end_unchanged contain no useful information. */ | |
420 | int unchanged_modified; | |
421 | ||
422 | /* BUF_OVERLAY_MODIFF of current buffer, as of last redisplay that | |
423 | finished; if it matches BUF_OVERLAY_MODIFF, beg_unchanged and | |
424 | end_unchanged contain no useful information. */ | |
425 | int overlay_unchanged_modified; | |
426 | ||
bb4fee02 DL |
427 | /* Properties of this buffer's text. */ |
428 | INTERVAL intervals; | |
c1ea566e RS |
429 | |
430 | /* The markers that refer to this buffer. | |
431 | This is actually a single marker --- | |
432 | successive elements in its marker `chain' | |
433 | are the other markers referring to this buffer. */ | |
434 | Lisp_Object markers; | |
b3ec245a JB |
435 | }; |
436 | ||
69f9064e RS |
437 | /* This is the structure that the buffer Lisp object points to. */ |
438 | ||
b3ec245a | 439 | struct buffer |
82b911fd GM |
440 | { |
441 | /* Everything before the `name' slot must be of a non-Lisp_Object type, | |
442 | and every slot after `name' must be a Lisp_Object. | |
443 | ||
444 | Check out mark_buffer (alloc.c) to see why. */ | |
445 | ||
446 | EMACS_INT size; | |
447 | ||
448 | /* Next buffer, in chain of all buffers including killed buffers. | |
449 | This chain is used only for garbage collection, in order to | |
450 | collect killed buffers properly. | |
451 | Note that vectors and most pseudovectors are all on one chain, | |
452 | but buffers are on a separate chain of their own. */ | |
453 | struct buffer *next; | |
454 | ||
455 | /* This structure holds the coordinates of the buffer contents | |
456 | in ordinary buffers. In indirect buffers, this is not used. */ | |
457 | struct buffer_text own_text; | |
458 | ||
459 | /* This points to the `struct buffer_text' that used for this buffer. | |
460 | In an ordinary buffer, this is the own_text field above. | |
461 | In an indirect buffer, this is the own_text field of another buffer. */ | |
462 | struct buffer_text *text; | |
463 | ||
464 | /* Char position of point in buffer. */ | |
465 | int pt; | |
466 | /* Byte position of point in buffer. */ | |
467 | int pt_byte; | |
468 | /* Char position of beginning of accessible range. */ | |
469 | int begv; | |
470 | /* Byte position of beginning of accessible range. */ | |
471 | int begv_byte; | |
472 | /* Char position of end of accessible range. */ | |
473 | int zv; | |
474 | /* Byte position of end of accessible range. */ | |
475 | int zv_byte; | |
476 | ||
477 | /* In an indirect buffer, this points to the base buffer. | |
478 | In an ordinary buffer, it is 0. */ | |
479 | struct buffer *base_buffer; | |
480 | ||
481 | /* A non-zero value in slot IDX means that per-buffer variable | |
482 | with index IDX has a local value in this buffer. The index IDX | |
483 | for a buffer-local variable is stored in that variable's slot | |
484 | in buffer_local_flags as a Lisp integer. If the index is -1, | |
485 | this means the variable is always local in all buffers. */ | |
ddebaaa9 | 486 | #define MAX_PER_BUFFER_VARS 50 |
82b911fd | 487 | char local_flags[MAX_PER_BUFFER_VARS]; |
979332f6 | 488 | |
82b911fd GM |
489 | /* Set to the modtime of the visited file when read or written. |
490 | -1 means visited file was nonexistent. | |
491 | 0 means visited file modtime unknown; in no case complain | |
492 | about any mismatch on next save attempt. */ | |
493 | int modtime; | |
494 | /* the value of text->modiff at the last auto-save. */ | |
495 | int auto_save_modified; | |
496 | /* The time at which we detected a failure to auto-save, | |
497 | Or -1 if we didn't have a failure. */ | |
498 | int auto_save_failure_time; | |
499 | /* Position in buffer at which display started | |
500 | the last time this buffer was displayed. */ | |
501 | int last_window_start; | |
502 | ||
503 | /* Set nonzero whenever the narrowing is changed in this buffer. */ | |
504 | int clip_changed; | |
505 | ||
506 | /* If the long line scan cache is enabled (i.e. the buffer-local | |
507 | variable cache-long-line-scans is non-nil), newline_cache | |
508 | points to the newline cache, and width_run_cache points to the | |
509 | width run cache. | |
510 | ||
511 | The newline cache records which stretches of the buffer are | |
512 | known *not* to contain newlines, so that they can be skipped | |
513 | quickly when we search for newlines. | |
514 | ||
515 | The width run cache records which stretches of the buffer are | |
516 | known to contain characters whose widths are all the same. If | |
517 | the width run cache maps a character to a value > 0, that value is | |
518 | the character's width; if it maps a character to zero, we don't | |
519 | know what its width is. This allows compute_motion to process | |
520 | such regions very quickly, using algebra instead of inspecting | |
521 | each character. See also width_table, below. */ | |
522 | struct region_cache *newline_cache; | |
523 | struct region_cache *width_run_cache; | |
524 | ||
525 | /* Non-zero means don't use redisplay optimizations for | |
526 | displaying this buffer. */ | |
527 | unsigned prevent_redisplay_optimizations_p : 1; | |
528 | ||
529 | /* Changes in the buffer are recorded here for undo. | |
530 | t means don't record anything. | |
531 | This information belongs to the base buffer of an indirect buffer, | |
532 | But we can't store it in the struct buffer_text | |
533 | because local variables have to be right in the struct buffer. | |
534 | So we copy it around in set_buffer_internal. | |
535 | This comes before `name' because it is marked in a special way. */ | |
536 | Lisp_Object undo_list; | |
537 | ||
538 | /* Everything from here down must be a Lisp_Object */ | |
539 | ||
540 | /* The name of this buffer. */ | |
541 | Lisp_Object name; | |
542 | ||
543 | /* The name of the file visited in this buffer, or nil. */ | |
544 | Lisp_Object filename; | |
545 | /* Dir for expanding relative file names. */ | |
546 | Lisp_Object directory; | |
547 | /* True iff this buffer has been backed up (if you write to the | |
548 | visited file and it hasn't been backed up, then a backup will | |
549 | be made). */ | |
550 | /* This isn't really used by the C code, so could be deleted. */ | |
551 | Lisp_Object backed_up; | |
552 | /* Length of file when last read or saved. | |
553 | This is not in the struct buffer_text | |
554 | because it's not used in indirect buffers at all. */ | |
555 | Lisp_Object save_length; | |
556 | /* File name used for auto-saving this buffer. | |
557 | This is not in the struct buffer_text | |
558 | because it's not used in indirect buffers at all. */ | |
559 | Lisp_Object auto_save_file_name; | |
560 | ||
561 | /* Non-nil if buffer read-only. */ | |
562 | Lisp_Object read_only; | |
563 | /* "The mark". This is a marker which may | |
564 | point into this buffer or may point nowhere. */ | |
565 | Lisp_Object mark; | |
566 | ||
567 | /* Alist of elements (SYMBOL . VALUE-IN-THIS-BUFFER) | |
568 | for all per-buffer variables of this buffer. */ | |
569 | Lisp_Object local_var_alist; | |
570 | ||
571 | /* Symbol naming major mode (eg, lisp-mode). */ | |
572 | Lisp_Object major_mode; | |
573 | /* Pretty name of major mode (eg, "Lisp"). */ | |
574 | Lisp_Object mode_name; | |
575 | /* Mode line element that controls format of mode line. */ | |
576 | Lisp_Object mode_line_format; | |
2d8c80b1 | 577 | |
82b911fd GM |
578 | /* Analogous to mode_line_format for the line displayed at the top |
579 | of windows. Nil means don't display that line. */ | |
580 | Lisp_Object header_line_format; | |
581 | ||
582 | /* Keys that are bound local to this buffer. */ | |
583 | Lisp_Object keymap; | |
584 | /* This buffer's local abbrev table. */ | |
585 | Lisp_Object abbrev_table; | |
586 | /* This buffer's syntax table. */ | |
587 | Lisp_Object syntax_table; | |
588 | /* This buffer's category table. */ | |
589 | Lisp_Object category_table; | |
590 | ||
591 | /* Values of several buffer-local variables */ | |
592 | /* tab-width is buffer-local so that redisplay can find it | |
593 | in buffers that are not current */ | |
594 | Lisp_Object case_fold_search; | |
595 | Lisp_Object tab_width; | |
596 | Lisp_Object fill_column; | |
597 | Lisp_Object left_margin; | |
598 | /* Function to call when insert space past fill column. */ | |
599 | Lisp_Object auto_fill_function; | |
600 | /* nil: text, t: binary. | |
601 | This value is meaningful only on certain operating systems. */ | |
602 | /* Actually, we don't need this flag any more because end-of-line | |
603 | is handled correctly according to the buffer-file-coding-system | |
604 | of the buffer. Just keeping it for backward compatibility. */ | |
605 | Lisp_Object buffer_file_type; | |
606 | ||
607 | /* Case table for case-conversion in this buffer. | |
608 | This char-table maps each char into its lower-case version. */ | |
609 | Lisp_Object downcase_table; | |
610 | /* Char-table mapping each char to its upper-case version. */ | |
611 | Lisp_Object upcase_table; | |
612 | /* Char-table for conversion for case-folding search. */ | |
613 | Lisp_Object case_canon_table; | |
614 | /* Char-table of equivalences for case-folding search. */ | |
615 | Lisp_Object case_eqv_table; | |
616 | ||
617 | /* Non-nil means do not display continuation lines. */ | |
618 | Lisp_Object truncate_lines; | |
619 | /* Non-nil means display ctl chars with uparrow. */ | |
620 | Lisp_Object ctl_arrow; | |
621 | /* Non-nil means display text from right to left. */ | |
622 | Lisp_Object direction_reversed; | |
623 | /* Non-nil means do selective display; | |
624 | see doc string in syms_of_buffer (buffer.c) for details. */ | |
625 | Lisp_Object selective_display; | |
b3ec245a | 626 | #ifndef old |
82b911fd GM |
627 | /* Non-nil means show ... at end of line followed by invisible lines. */ |
628 | Lisp_Object selective_display_ellipses; | |
b3ec245a | 629 | #endif |
82b911fd GM |
630 | /* Alist of (FUNCTION . STRING) for each minor mode enabled in buffer. */ |
631 | Lisp_Object minor_modes; | |
632 | /* t if "self-insertion" should overwrite; `binary' if it should also | |
633 | overwrite newlines and tabs - for editing executables and the like. */ | |
634 | Lisp_Object overwrite_mode; | |
635 | /* non-nil means abbrev mode is on. Expand abbrevs automatically. */ | |
636 | Lisp_Object abbrev_mode; | |
637 | /* Display table to use for text in this buffer. */ | |
638 | Lisp_Object display_table; | |
639 | /* t means the mark and region are currently active. */ | |
640 | Lisp_Object mark_active; | |
641 | ||
642 | /* List of overlays that end at or before the current center, | |
643 | in order of end-position. */ | |
644 | Lisp_Object overlays_before; | |
645 | ||
646 | /* List of overlays that end after the current center, | |
647 | in order of start-position. */ | |
648 | Lisp_Object overlays_after; | |
649 | ||
650 | /* Position where the overlay lists are centered. */ | |
651 | Lisp_Object overlay_center; | |
652 | ||
653 | /* Non-nil means the buffer contents are regarded as multi-byte | |
654 | form of characters, not a binary code. */ | |
655 | Lisp_Object enable_multibyte_characters; | |
656 | ||
657 | /* Coding system to be used for encoding the buffer contents on | |
658 | saving. */ | |
659 | Lisp_Object buffer_file_coding_system; | |
660 | ||
661 | /* List of symbols naming the file format used for visited file. */ | |
662 | Lisp_Object file_format; | |
663 | ||
664 | /* True if the newline position cache and width run cache are | |
665 | enabled. See search.c and indent.c. */ | |
666 | Lisp_Object cache_long_line_scans; | |
667 | ||
668 | /* If the width run cache is enabled, this table contains the | |
669 | character widths width_run_cache (see above) assumes. When we | |
670 | do a thorough redisplay, we compare this against the buffer's | |
671 | current display table to see whether the display table has | |
672 | affected the widths of any characters. If it has, we | |
673 | invalidate the width run cache, and re-initialize width_table. */ | |
674 | Lisp_Object width_table; | |
675 | ||
676 | /* In an indirect buffer, or a buffer that is the base of an | |
677 | indirect buffer, this holds a marker that records | |
678 | PT for this buffer when the buffer is not current. */ | |
679 | Lisp_Object pt_marker; | |
680 | ||
681 | /* In an indirect buffer, or a buffer that is the base of an | |
682 | indirect buffer, this holds a marker that records | |
683 | BEGV for this buffer when the buffer is not current. */ | |
684 | Lisp_Object begv_marker; | |
685 | ||
686 | /* In an indirect buffer, or a buffer that is the base of an | |
687 | indirect buffer, this holds a marker that records | |
688 | ZV for this buffer when the buffer is not current. */ | |
689 | Lisp_Object zv_marker; | |
690 | ||
691 | /* This holds the point value before the last scroll operation. | |
692 | Explicitly setting point sets this to nil. */ | |
693 | Lisp_Object point_before_scroll; | |
694 | ||
695 | /* Truename of the visited file, or nil. */ | |
696 | Lisp_Object file_truename; | |
697 | ||
698 | /* Invisibility spec of this buffer. | |
699 | t => any non-nil `invisible' property means invisible. | |
700 | A list => `invisible' property means invisible | |
701 | if it is memq in that list. */ | |
702 | Lisp_Object invisibility_spec; | |
703 | ||
704 | /* This is the last window that was selected with this buffer in it, | |
705 | or nil if that window no longer displays this buffer. */ | |
706 | Lisp_Object last_selected_window; | |
707 | ||
708 | /* Incremented each time the buffer is displayed in a window. */ | |
709 | Lisp_Object display_count; | |
f809d162 | 710 | |
82b911fd GM |
711 | /* Widths of left and right marginal areas for windows displaying |
712 | this buffer. */ | |
713 | Lisp_Object left_margin_width, right_margin_width; | |
714 | ||
715 | /* Non-nil means indicate lines not displaying text (in a style | |
716 | like vi). */ | |
717 | Lisp_Object indicate_empty_lines; | |
718 | ||
719 | /* Time stamp updated each time this buffer is displayed in a window. */ | |
720 | Lisp_Object display_time; | |
721 | ||
722 | /* If scrolling the display because point is below the bottom of a | |
723 | window showing this buffer, try to choose a window start so | |
724 | that point ends up this number of lines from the top of the | |
725 | window. Nil means that scrolling method isn't used. */ | |
726 | Lisp_Object scroll_up_aggressively; | |
2d8c80b1 | 727 | |
82b911fd GM |
728 | /* If scrolling the display because point is above the top of a |
729 | window showing this buffer, try to choose a window start so | |
730 | that point ends up this number of lines from the bottom of the | |
731 | window. Nil means that scrolling method isn't used. */ | |
732 | Lisp_Object scroll_down_aggressively; | |
2d8c80b1 | 733 | |
82b911fd GM |
734 | /* Desired cursor type in this buffer. See the doc string of |
735 | per-buffer variable `cursor-type'. */ | |
736 | Lisp_Object cursor_type; | |
737 | ||
738 | /* An integer > 0 means put that number of pixels below text lines | |
739 | in the display of this buffer. */ | |
740 | Lisp_Object extra_line_spacing; | |
741 | }; | |
a698b358 | 742 | |
440d350c RS |
743 | \f |
744 | /* This points to the current buffer. */ | |
b3ec245a JB |
745 | |
746 | extern struct buffer *current_buffer; | |
747 | ||
748 | /* This structure holds the default values of the buffer-local variables | |
440d350c | 749 | that have special slots in each buffer. |
b3ec245a JB |
750 | The default value occupies the same slot in this structure |
751 | as an individual buffer's value occupies in that buffer. | |
752 | Setting the default value also goes through the alist of buffers | |
753 | and stores into each buffer that does not say it has a local value. */ | |
754 | ||
755 | extern struct buffer buffer_defaults; | |
756 | ||
757 | /* This structure marks which slots in a buffer have corresponding | |
758 | default values in buffer_defaults. | |
759 | Each such slot has a nonzero value in this structure. | |
760 | The value has only one nonzero bit. | |
761 | ||
762 | When a buffer has its own local value for a slot, | |
979332f6 GM |
763 | the entry for that slot (found in the same slot in this structure) |
764 | is turned on in the buffer's local_flags array. | |
b3ec245a JB |
765 | |
766 | If a slot in this structure is zero, then even though there may | |
440d350c | 767 | be a Lisp-level local variable for the slot, it has no default value, |
b3ec245a JB |
768 | and the corresponding slot in buffer_defaults is not used. */ |
769 | ||
770 | extern struct buffer buffer_local_flags; | |
771 | ||
772 | /* For each buffer slot, this points to the Lisp symbol name | |
773 | for that slot in the current buffer. It is 0 for slots | |
774 | that don't have such names. */ | |
775 | ||
776 | extern struct buffer buffer_local_symbols; | |
777 | ||
fbfed6f0 JB |
778 | /* This structure holds the required types for the values in the |
779 | buffer-local slots. If a slot contains Qnil, then the | |
780 | corresponding buffer slot may contain a value of any type. If a | |
781 | slot contains an integer, then prospective values' tags must be | |
f00008bc KH |
782 | equal to that integer (except nil is always allowed). |
783 | When a tag does not match, the function | |
784 | buffer_slot_type_mismatch will signal an error. | |
785 | ||
786 | If a slot here contains -1, the corresponding variable is read-only. */ | |
787 | ||
ea47125f | 788 | extern struct buffer buffer_local_types; |
440d350c | 789 | \f |
4b7610a9 AS |
790 | extern void reset_buffer P_ ((struct buffer *)); |
791 | extern void evaporate_overlays P_ ((int)); | |
bac40480 | 792 | extern int overlays_at P_ ((int, int, Lisp_Object **, int *, int *, int *, int)); |
4b7610a9 AS |
793 | extern int sort_overlays P_ ((Lisp_Object *, int, struct window *)); |
794 | extern void recenter_overlay_lists P_ ((struct buffer *, int)); | |
795 | extern int overlay_strings P_ ((int, struct window *, unsigned char **)); | |
796 | extern void validate_region P_ ((Lisp_Object *, Lisp_Object *)); | |
797 | extern void set_buffer_internal P_ ((struct buffer *)); | |
798 | extern void set_buffer_internal_1 P_ ((struct buffer *)); | |
799 | extern void set_buffer_temp P_ ((struct buffer *)); | |
800 | extern void record_buffer P_ ((Lisp_Object)); | |
801 | extern void buffer_slot_type_mismatch P_ ((int)); | |
802 | extern void fix_overlays_before P_ ((struct buffer *, int, int)); | |
a465f86b | 803 | extern void mmap_set_vars P_ ((int)); |
4b7610a9 AS |
804 | |
805 | EXFUN (Fbuffer_name, 1); | |
806 | EXFUN (Fget_file_buffer, 1); | |
807 | EXFUN (Fnext_overlay_change, 1); | |
808 | EXFUN (Fdelete_overlay, 1); | |
440d350c | 809 | |
c1ea566e | 810 | /* Functions to call before and after each text change. */ |
03c6309a RS |
811 | extern Lisp_Object Vbefore_change_functions; |
812 | extern Lisp_Object Vafter_change_functions; | |
dbc4e1c1 | 813 | extern Lisp_Object Vfirst_change_hook; |
23f73711 RS |
814 | extern Lisp_Object Qbefore_change_functions; |
815 | extern Lisp_Object Qafter_change_functions; | |
dbc4e1c1 | 816 | extern Lisp_Object Qfirst_change_hook; |
b3ec245a | 817 | |
347d3e9c KH |
818 | /* If nonzero, all modification hooks are suppressed. */ |
819 | extern int inhibit_modification_hooks; | |
820 | ||
83ec8b67 RS |
821 | extern Lisp_Object Vdeactivate_mark; |
822 | extern Lisp_Object Vtransient_mark_mode; | |
440d350c RS |
823 | \f |
824 | /* Overlays */ | |
825 | ||
d00c875c | 826 | /* 1 if the OV is an overlay object. */ |
6c523803 | 827 | #define OVERLAY_VALID(OV) (OVERLAYP (OV)) |
b3ec245a | 828 | |
440d350c | 829 | /* Return the marker that stands for where OV starts in the buffer. */ |
21f7c864 | 830 | #define OVERLAY_START(OV) (XOVERLAY (OV)->start) |
b3ec245a | 831 | |
440d350c | 832 | /* Return the marker that stands for where OV ends in the buffer. */ |
21f7c864 | 833 | #define OVERLAY_END(OV) (XOVERLAY (OV)->end) |
b3ec245a | 834 | |
d00c875c KH |
835 | /* Return the actual buffer position for the marker P. |
836 | We assume you know which buffer it's pointing into. */ | |
b3ec245a | 837 | |
915857ff KH |
838 | #define OVERLAY_POSITION(P) \ |
839 | (GC_MARKERP (P) ? marker_position (P) : (abort (), 0)) | |
b3ec245a | 840 | |
39c75ccb | 841 | \f |
979332f6 GM |
842 | /*********************************************************************** |
843 | Buffer-local Variables | |
844 | ***********************************************************************/ | |
845 | ||
846 | /* Number of per-buffer variables used. */ | |
847 | ||
ddebaaa9 | 848 | extern int last_per_buffer_idx; |
979332f6 GM |
849 | |
850 | /* Return the offset in bytes of member VAR of struct buffer | |
851 | from the start of a buffer structure. */ | |
852 | ||
ddebaaa9 | 853 | #define PER_BUFFER_VAR_OFFSET(VAR) \ |
979332f6 GM |
854 | ((char *) &buffer_local_flags.VAR - (char *) &buffer_local_flags) |
855 | ||
856 | /* Return the index of buffer-local variable VAR. Each per-buffer | |
857 | variable has an index > 0 associated with it, except when it always | |
858 | has buffer-local values, in which case the index is -1. If this is | |
859 | 0, this is a bug and means that the slot of VAR in | |
860 | buffer_local_flags wasn't intiialized. */ | |
861 | ||
ddebaaa9 GM |
862 | #define PER_BUFFER_VAR_IDX(VAR) \ |
863 | PER_BUFFER_IDX (PER_BUFFER_VAR_OFFSET (VAR)) | |
979332f6 GM |
864 | |
865 | /* Value is non-zero if the variable with index IDX has a local value | |
866 | in buffer B. */ | |
867 | ||
ddebaaa9 GM |
868 | #define PER_BUFFER_VALUE_P(B, IDX) \ |
869 | (((IDX) < 0 || IDX >= last_per_buffer_idx) \ | |
979332f6 GM |
870 | ? (abort (), 0) \ |
871 | : ((B)->local_flags[IDX] != 0)) | |
872 | ||
873 | /* Set whether per-buffer variable with index IDX has a buffer-local | |
874 | value in buffer B. VAL zero means it hasn't. */ | |
875 | ||
ddebaaa9 | 876 | #define SET_PER_BUFFER_VALUE_P(B, IDX, VAL) \ |
979332f6 | 877 | do { \ |
ddebaaa9 | 878 | if ((IDX) < 0 || (IDX) >= last_per_buffer_idx) \ |
979332f6 GM |
879 | abort (); \ |
880 | (B)->local_flags[IDX] = (VAL); \ | |
881 | } while (0) | |
882 | ||
883 | /* Return the index of the per-buffer variable at offset OFFSET in the | |
884 | buffer structure. */ | |
885 | ||
ddebaaa9 | 886 | #define PER_BUFFER_IDX(OFFSET) \ |
979332f6 GM |
887 | XINT (*(Lisp_Object *)((OFFSET) + (char *) &buffer_local_flags)) |
888 | ||
889 | /* Return the default value of the per-buffer variable at offset | |
890 | OFFSET in the buffer structure. */ | |
891 | ||
ddebaaa9 | 892 | #define PER_BUFFER_DEFAULT(OFFSET) \ |
979332f6 GM |
893 | (*(Lisp_Object *)((OFFSET) + (char *) &buffer_defaults)) |
894 | ||
895 | /* Return the buffer-local value of the per-buffer variable at offset | |
896 | OFFSET in the buffer structure. */ | |
897 | ||
ddebaaa9 | 898 | #define PER_BUFFER_VALUE(BUFFER, OFFSET) \ |
979332f6 GM |
899 | (*(Lisp_Object *)((OFFSET) + (char *) (BUFFER))) |
900 | ||
901 | /* Return the symbol of the per-buffer variable at offset OFFSET in | |
902 | the buffer structure. */ | |
903 | ||
ddebaaa9 | 904 | #define PER_BUFFER_SYMBOL(OFFSET) \ |
979332f6 GM |
905 | (*(Lisp_Object *)((OFFSET) + (char *) &buffer_local_symbols)) |
906 | ||
907 | /* Return the type of the per-buffer variable at offset OFFSET in the | |
908 | buffer structure. */ | |
909 | ||
ddebaaa9 | 910 | #define PER_BUFFER_TYPE(OFFSET) \ |
979332f6 | 911 | (*(Lisp_Object *)((OFFSET) + (char *) &buffer_local_types)) |