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b3ec245a | 1 | /* Header file for the buffer manipulation primitives. |
f8c25f1b | 2 | Copyright (C) 1985, 1986, 1993, 1994, 1995 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 | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
1b92beaf JA |
21 | #ifdef USE_TEXT_PROPERTIES |
22 | #define SET_PT(position) (set_point ((position), current_buffer)) | |
23 | #define TEMP_SET_PT(position) (temp_set_point ((position), current_buffer)) | |
24 | ||
25 | #define BUF_SET_PT(buffer, position) (set_point ((position), (buffer))) | |
26 | #define BUF_TEMP_SET_PT(buffer, position) (temp_set_point ((position), (buffer))) | |
27 | ||
28 | #else /* don't support text properties */ | |
29 | ||
c1ea566e RS |
30 | #define SET_PT(position) (current_buffer->pt = (position)) |
31 | #define TEMP_SET_PT(position) (current_buffer->pt = (position)) | |
1b92beaf | 32 | |
c1ea566e RS |
33 | #define BUF_SET_PT(buffer, position) (buffer->pt = (position)) |
34 | #define BUF_TEMP_SET_PT(buffer, position) (buffer->pt = (position)) | |
1b92beaf | 35 | #endif /* don't support text properties */ |
b3ec245a JB |
36 | |
37 | /* Character position of beginning of buffer. */ | |
38 | #define BEG (1) | |
39 | ||
40 | /* Character position of beginning of accessible range of buffer. */ | |
c1ea566e | 41 | #define BEGV (current_buffer->begv) |
b3ec245a JB |
42 | |
43 | /* Character position of point in buffer. The "+ 0" makes this | |
44 | not an l-value, so you can't assign to it. Use SET_PT instead. */ | |
c1ea566e | 45 | #define PT (current_buffer->pt + 0) |
b3ec245a JB |
46 | |
47 | /* Character position of gap in buffer. */ | |
c1ea566e | 48 | #define GPT (current_buffer->text->gpt) |
b3ec245a JB |
49 | |
50 | /* Character position of end of accessible range of buffer. */ | |
c1ea566e | 51 | #define ZV (current_buffer->zv) |
b3ec245a JB |
52 | |
53 | /* Character position of end of buffer. */ | |
c1ea566e | 54 | #define Z (current_buffer->text->z) |
b3ec245a | 55 | |
e12f3519 ER |
56 | /* Is the current buffer narrowed? */ |
57 | #define NARROWED ((BEGV != BEG) || (ZV != Z)) | |
58 | ||
b3ec245a | 59 | /* Modification count. */ |
c1ea566e RS |
60 | #define MODIFF (current_buffer->text->modiff) |
61 | ||
62 | /* Modification count as of last visit or save. */ | |
63 | #define SAVE_MODIFF (current_buffer->text->save_modiff) | |
b3ec245a JB |
64 | |
65 | /* Address of beginning of buffer. */ | |
c1ea566e | 66 | #define BEG_ADDR (current_buffer->text->beg) |
b3ec245a JB |
67 | |
68 | /* Address of beginning of accessible range of buffer. */ | |
c1ea566e | 69 | #define BEGV_ADDR (&FETCH_CHAR (current_buffer->begv)) |
b3ec245a JB |
70 | |
71 | /* Address of point in buffer. */ | |
c1ea566e | 72 | #define PT_ADDR (&FETCH_CHAR (current_buffer->pt)) |
b3ec245a JB |
73 | |
74 | /* Address of beginning of gap in buffer. */ | |
c1ea566e | 75 | #define GPT_ADDR (current_buffer->text->beg + current_buffer->text->gpt - 1) |
b3ec245a JB |
76 | |
77 | /* Address of end of gap in buffer. */ | |
c1ea566e | 78 | #define GAP_END_ADDR (current_buffer->text->beg + current_buffer->text->gpt + current_buffer->text->gap_size - 1) |
b3ec245a JB |
79 | |
80 | /* Address of end of accessible range of buffer. */ | |
c1ea566e | 81 | #define ZV_ADDR (&FETCH_CHAR (current_buffer->zv)) |
b3ec245a JB |
82 | |
83 | /* Size of gap. */ | |
c1ea566e | 84 | #define GAP_SIZE (current_buffer->text->gap_size) |
b3ec245a JB |
85 | |
86 | /* Now similar macros for a specified buffer. | |
87 | Note that many of these evaluate the buffer argument more than once. */ | |
88 | ||
89 | /* Character position of beginning of buffer. */ | |
90 | #define BUF_BEG(buf) (1) | |
91 | ||
92 | /* Character position of beginning of accessible range of buffer. */ | |
c1ea566e | 93 | #define BUF_BEGV(buf) ((buf)->begv) |
b3ec245a JB |
94 | |
95 | /* Character position of point in buffer. */ | |
c1ea566e | 96 | #define BUF_PT(buf) ((buf)->pt) |
b3ec245a JB |
97 | |
98 | /* Character position of gap in buffer. */ | |
c1ea566e | 99 | #define BUF_GPT(buf) ((buf)->text->gpt) |
b3ec245a JB |
100 | |
101 | /* Character position of end of accessible range of buffer. */ | |
c1ea566e | 102 | #define BUF_ZV(buf) ((buf)->zv) |
b3ec245a JB |
103 | |
104 | /* Character position of end of buffer. */ | |
c1ea566e | 105 | #define BUF_Z(buf) ((buf)->text->z) |
b3ec245a | 106 | |
e12f3519 | 107 | /* Is this buffer narrowed? */ |
c1ea566e RS |
108 | #define BUF_NARROWED(buf) ((BUF_BEGV (buf) != BUF_BEG (buf)) \ |
109 | || (BUF_ZV (buf) != BUF_Z (buf))) | |
e12f3519 | 110 | |
b3ec245a | 111 | /* Modification count. */ |
c1ea566e RS |
112 | #define BUF_MODIFF(buf) ((buf)->text->modiff) |
113 | ||
114 | /* Modification count as of last visit or save. */ | |
115 | #define BUF_SAVE_MODIFF(buf) ((buf)->text->save_modiff) | |
116 | ||
117 | /* Interval tree of buffer. */ | |
118 | #define BUF_INTERVALS(buf) ((buf)->text->intervals) | |
119 | ||
120 | /* Marker chain of buffer. */ | |
121 | #define BUF_MARKERS(buf) ((buf)->text->markers) | |
b3ec245a JB |
122 | |
123 | /* Address of beginning of buffer. */ | |
c1ea566e | 124 | #define BUF_BEG_ADDR(buf) ((buf)->text->beg) |
b3ec245a JB |
125 | |
126 | /* Macro for setting the value of BUF_ZV (BUF) to VALUE, | |
127 | by varying the end of the accessible region. */ | |
c1ea566e RS |
128 | #define SET_BUF_ZV(buf, value) ((buf)->zv = (value)) |
129 | #define SET_BUF_PT(buf, value) ((buf)->pt = (value)) | |
b3ec245a JB |
130 | |
131 | /* Size of gap. */ | |
c1ea566e | 132 | #define BUF_GAP_SIZE(buf) ((buf)->text->gap_size) |
b3ec245a JB |
133 | |
134 | /* Return the address of character at position POS in buffer BUF. | |
135 | Note that both arguments can be computed more than once. */ | |
136 | #define BUF_CHAR_ADDRESS(buf, pos) \ | |
c1ea566e RS |
137 | ((buf)->text->beg + (pos) - 1 \ |
138 | + ((pos) >= (buf)->text->gpt ? (buf)->text->gap_size : 0)) | |
b3ec245a JB |
139 | |
140 | /* Convert the address of a char in the buffer into a character position. */ | |
141 | #define PTR_CHAR_POS(ptr) \ | |
c1ea566e RS |
142 | ((ptr) - (current_buffer)->text->beg \ |
143 | - (ptr - (current_buffer)->text->beg < (unsigned) GPT ? 0 : GAP_SIZE) \ | |
b3ec245a | 144 | + 1) |
790f39e7 RS |
145 | |
146 | /* Convert the address of a char in the buffer into a character position. */ | |
147 | #define BUF_PTR_CHAR_POS(buf, ptr) \ | |
c1ea566e RS |
148 | ((ptr) - (buf)->text->beg \ |
149 | - (ptr - (buf)->text->beg < (unsigned) BUF_GPT ((buf)) \ | |
790f39e7 RS |
150 | ? 0 : BUF_GAP_SIZE ((buf))) \ |
151 | + 1) | |
b3ec245a JB |
152 | \f |
153 | struct buffer_text | |
154 | { | |
c1ea566e RS |
155 | unsigned char *beg; /* Actual address of buffer contents. */ |
156 | int gpt; /* Index of gap in buffer. */ | |
157 | int z; /* Index of end of buffer. */ | |
158 | int gap_size; /* Size of buffer's gap. */ | |
b3ec245a JB |
159 | int modiff; /* This counts buffer-modification events |
160 | for this buffer. It is incremented for | |
161 | each such event, and never otherwise | |
162 | changed. */ | |
c1ea566e RS |
163 | int save_modiff; /* Previous value of modiff, as of last |
164 | time buffer visited or saved a file. */ | |
165 | ||
166 | /* Properties of this buffer's text -- conditionally compiled. */ | |
167 | DECLARE_INTERVALS | |
168 | ||
169 | /* The markers that refer to this buffer. | |
170 | This is actually a single marker --- | |
171 | successive elements in its marker `chain' | |
172 | are the other markers referring to this buffer. */ | |
173 | Lisp_Object markers; | |
b3ec245a JB |
174 | }; |
175 | ||
176 | struct buffer | |
177 | { | |
178 | /* Everything before the `name' slot must be of a non-Lisp_Object type, | |
179 | and every slot after `name' must be a Lisp_Object. | |
180 | ||
c1ea566e RS |
181 | Check out mark_buffer (alloc.c) to see why. */ |
182 | ||
183 | EMACS_INT size; | |
b3ec245a | 184 | |
b3ec245a JB |
185 | /* Next buffer, in chain of all buffers including killed buffers. |
186 | This chain is used only for garbage collection, in order to | |
c1ea566e RS |
187 | collect killed buffers properly. |
188 | Note that vectors and most pseudovectors are all on one chain, | |
189 | but buffers are on a separate chain of their own. */ | |
b3ec245a | 190 | struct buffer *next; |
c1ea566e RS |
191 | |
192 | /* This structure holds the coordinates of the buffer contents | |
193 | in ordinary buffers. In indirect buffers, this is not used. */ | |
194 | struct buffer_text own_text; | |
195 | ||
196 | /* This points to the `struct buffer_text' that used for this buffer. | |
197 | In an ordinary buffer, this is the own_text field above. | |
198 | In an indirect buffer, this is the own_text field of another buffer. */ | |
199 | struct buffer_text *text; | |
200 | ||
201 | /* Position of point in buffer. */ | |
202 | int pt; | |
203 | /* Index of beginning of accessible range. */ | |
204 | int begv; | |
205 | /* Index of end of accessible range. */ | |
206 | int zv; | |
207 | ||
208 | /* In an indirect buffer, this points to the base buffer. | |
209 | In an ordinary buffer, it is 0. */ | |
210 | struct buffer *base_buffer; | |
211 | ||
b3ec245a JB |
212 | /* Flags saying which DEFVAR_PER_BUFFER variables |
213 | are local to this buffer. */ | |
214 | int local_var_flags; | |
b3ec245a JB |
215 | /* Set to the modtime of the visited file when read or written. |
216 | -1 means visited file was nonexistent. | |
217 | 0 means visited file modtime unknown; in no case complain | |
218 | about any mismatch on next save attempt. */ | |
219 | int modtime; | |
c1ea566e | 220 | /* the value of text->modiff at the last auto-save. */ |
b3ec245a | 221 | int auto_save_modified; |
4c0dc722 RS |
222 | /* The time at which we detected a failure to auto-save, |
223 | Or -1 if we didn't have a failure. */ | |
224 | int auto_save_failure_time; | |
b3ec245a | 225 | /* Position in buffer at which display started |
c1ea566e | 226 | the last time this buffer was displayed. */ |
b3ec245a JB |
227 | int last_window_start; |
228 | ||
715bde06 RS |
229 | /* Set nonzero whenever the narrowing is changed in this buffer. */ |
230 | int clip_changed; | |
231 | ||
18e93755 JB |
232 | /* If the long line scan cache is enabled (i.e. the buffer-local |
233 | variable cache-long-line-scans is non-nil), newline_cache | |
234 | points to the newline cache, and width_run_cache points to the | |
235 | width run cache. | |
236 | ||
237 | The newline cache records which stretches of the buffer are | |
238 | known *not* to contain newlines, so that they can be skipped | |
239 | quickly when we search for newlines. | |
240 | ||
241 | The width run cache records which stretches of the buffer are | |
242 | known to contain characters whose widths are all the same. If | |
243 | the width run cache maps a character to a value > 0, that value is | |
244 | the character's width; if it maps a character to zero, we don't | |
245 | know what its width is. This allows compute_motion to process | |
246 | such regions very quickly, using algebra instead of inspecting | |
247 | each character. See also width_table, below. */ | |
248 | struct region_cache *newline_cache; | |
249 | struct region_cache *width_run_cache; | |
b3ec245a JB |
250 | |
251 | /* Everything from here down must be a Lisp_Object */ | |
252 | ||
253 | ||
c1ea566e | 254 | /* The name of this buffer. */ |
b3ec245a | 255 | Lisp_Object name; |
c1ea566e | 256 | /* The name of the file visited in this buffer, or nil. */ |
b3ec245a | 257 | Lisp_Object filename; |
c1ea566e | 258 | /* Dir for expanding relative file names. */ |
b3ec245a | 259 | Lisp_Object directory; |
c1ea566e RS |
260 | /* True iff this buffer has been backed up (if you write to the |
261 | visited file and it hasn't been backed up, then a backup will | |
262 | be made). */ | |
b3ec245a JB |
263 | /* This isn't really used by the C code, so could be deleted. */ |
264 | Lisp_Object backed_up; | |
c1ea566e RS |
265 | /* Length of file when last read or saved. |
266 | This is not in the struct buffer_text | |
267 | because it's not used in indirect buffers at all. */ | |
b3ec245a | 268 | Lisp_Object save_length; |
c1ea566e RS |
269 | /* File name used for auto-saving this buffer. |
270 | This is not in the struct buffer_text | |
271 | because it's not used in indirect buffers at all. */ | |
b3ec245a | 272 | Lisp_Object auto_save_file_name; |
c1ea566e RS |
273 | |
274 | /* Non-nil if buffer read-only. */ | |
b3ec245a | 275 | Lisp_Object read_only; |
c1ea566e RS |
276 | /* "The mark". This is a marker which may |
277 | point into this buffer or may point nowhere. */ | |
b3ec245a JB |
278 | Lisp_Object mark; |
279 | ||
280 | /* Alist of elements (SYMBOL . VALUE-IN-THIS-BUFFER) | |
281 | for all per-buffer variables of this buffer. */ | |
282 | Lisp_Object local_var_alist; | |
283 | ||
c1ea566e | 284 | /* Symbol naming major mode (eg, lisp-mode). */ |
b3ec245a | 285 | Lisp_Object major_mode; |
c1ea566e | 286 | /* Pretty name of major mode (eg, "Lisp"). */ |
b3ec245a | 287 | Lisp_Object mode_name; |
c1ea566e | 288 | /* Mode line element that controls format of mode line. */ |
b3ec245a JB |
289 | Lisp_Object mode_line_format; |
290 | ||
c1ea566e | 291 | /* Keys that are bound local to this buffer. */ |
b3ec245a | 292 | Lisp_Object keymap; |
c1ea566e | 293 | /* This buffer's local abbrev table. */ |
b3ec245a | 294 | Lisp_Object abbrev_table; |
c1ea566e | 295 | /* This buffer's syntax table. */ |
b3ec245a JB |
296 | Lisp_Object syntax_table; |
297 | ||
298 | /* Values of several buffer-local variables */ | |
299 | /* tab-width is buffer-local so that redisplay can find it | |
300 | in buffers that are not current */ | |
301 | Lisp_Object case_fold_search; | |
302 | Lisp_Object tab_width; | |
303 | Lisp_Object fill_column; | |
304 | Lisp_Object left_margin; | |
c1ea566e | 305 | /* Function to call when insert space past fill column. */ |
b3ec245a | 306 | Lisp_Object auto_fill_function; |
c1ea566e RS |
307 | /* nil: text, t: binary. |
308 | This value is meaningful only on certain operating systems. */ | |
54ad07d3 | 309 | Lisp_Object buffer_file_type; |
b3ec245a JB |
310 | |
311 | /* String of length 256 mapping each char to its lower-case version. */ | |
312 | Lisp_Object downcase_table; | |
313 | /* String of length 256 mapping each char to its upper-case version. */ | |
314 | Lisp_Object upcase_table; | |
c1ea566e RS |
315 | /* Translate table for case-folding search. */ |
316 | Lisp_Object case_canon_table; | |
317 | /* Inverse translate (equivalence class) table for case-folding search. */ | |
318 | Lisp_Object case_eqv_table; | |
b3ec245a | 319 | |
c1ea566e | 320 | /* Non-nil means do not display continuation lines. */ |
b3ec245a | 321 | Lisp_Object truncate_lines; |
c1ea566e | 322 | /* Non-nil means display ctl chars with uparrow. */ |
b3ec245a JB |
323 | Lisp_Object ctl_arrow; |
324 | /* Non-nil means do selective display; | |
c1ea566e | 325 | see doc string in syms_of_buffer (buffer.c) for details. */ |
b3ec245a JB |
326 | Lisp_Object selective_display; |
327 | #ifndef old | |
328 | /* Non-nil means show ... at end of line followed by invisible lines. */ | |
329 | Lisp_Object selective_display_ellipses; | |
330 | #endif | |
c1ea566e | 331 | /* Alist of (FUNCTION . STRING) for each minor mode enabled in buffer. */ |
b3ec245a | 332 | Lisp_Object minor_modes; |
6bbb0d4a JB |
333 | /* t if "self-insertion" should overwrite; `binary' if it should also |
334 | overwrite newlines and tabs - for editing executables and the like. */ | |
b3ec245a | 335 | Lisp_Object overwrite_mode; |
c1ea566e | 336 | /* non-nil means abbrev mode is on. Expand abbrevs automatically. */ |
b3ec245a | 337 | Lisp_Object abbrev_mode; |
c1ea566e | 338 | /* Display table to use for text in this buffer. */ |
b3ec245a | 339 | Lisp_Object display_table; |
83ec8b67 RS |
340 | /* t means the mark and region are currently active. */ |
341 | Lisp_Object mark_active; | |
b3ec245a | 342 | |
c1ea566e RS |
343 | /* Changes in the buffer are recorded here for undo. |
344 | t means don't record anything. | |
345 | This information belongs to the base buffer of an indirect buffer, | |
346 | But we can't store it in the struct buffer_text | |
347 | because local variables have to be right in the struct buffer. | |
348 | So we copy it around in set_buffer_internal. */ | |
349 | Lisp_Object undo_list; | |
350 | ||
440d350c RS |
351 | /* List of overlays that end at or before the current center, |
352 | in order of end-position. */ | |
353 | Lisp_Object overlays_before; | |
354 | ||
355 | /* List of overlays that end after the current center, | |
356 | in order of start-position. */ | |
357 | Lisp_Object overlays_after; | |
358 | ||
359 | /* Position where the overlay lists are centered. */ | |
360 | Lisp_Object overlay_center; | |
18e93755 | 361 | |
585b0a89 BG |
362 | /* Lisp of symbols naming the file format used for visited file. */ |
363 | Lisp_Object file_format; | |
364 | ||
18e93755 JB |
365 | /* True if the newline position cache and width run cache are |
366 | enabled. See search.c and indent.c. */ | |
367 | Lisp_Object cache_long_line_scans; | |
368 | ||
369 | /* If the width run cache is enabled, this table contains the | |
370 | character widths width_run_cache (see above) assumes. When we | |
371 | do a thorough redisplay, we compare this against the buffer's | |
372 | current display table to see whether the display table has | |
373 | affected the widths of any characters. If it has, we | |
c1ea566e | 374 | invalidate the width run cache, and re-initialize width_table. */ |
18e93755 | 375 | Lisp_Object width_table; |
c1ea566e RS |
376 | |
377 | /* In an indirect buffer, or a buffer that is the base of an | |
378 | indirect buffer, this holds a marker that records | |
379 | PT for this buffer when the buffer is not current. */ | |
380 | Lisp_Object pt_marker; | |
381 | ||
382 | /* In an indirect buffer, or a buffer that is the base of an | |
383 | indirect buffer, this holds a marker that records | |
384 | BEGV for this buffer when the buffer is not current. */ | |
385 | Lisp_Object begv_marker; | |
386 | ||
387 | /* In an indirect buffer, or a buffer that is the base of an | |
388 | indirect buffer, this holds a marker that records | |
389 | ZV for this buffer when the buffer is not current. */ | |
390 | Lisp_Object zv_marker; | |
2e4a1e1f RS |
391 | |
392 | /* This holds the point value before the last scroll operation. | |
393 | Explicitly setting point sets this to nil. */ | |
394 | Lisp_Object point_before_scroll; | |
8eb34fb9 RS |
395 | |
396 | /* Truename of the visited file, or nil. */ | |
397 | Lisp_Object file_truename; | |
4abe97d9 RS |
398 | |
399 | /* Invisibility spec of this buffer. | |
400 | t => any non-nil `invisible' property means invisible. | |
401 | A list => `invisible' property means invisible | |
402 | if it is memq in that list. */ | |
403 | Lisp_Object invisibility_spec; | |
c1ea566e | 404 | }; |
440d350c RS |
405 | \f |
406 | /* This points to the current buffer. */ | |
b3ec245a JB |
407 | |
408 | extern struct buffer *current_buffer; | |
409 | ||
410 | /* This structure holds the default values of the buffer-local variables | |
440d350c | 411 | that have special slots in each buffer. |
b3ec245a JB |
412 | The default value occupies the same slot in this structure |
413 | as an individual buffer's value occupies in that buffer. | |
414 | Setting the default value also goes through the alist of buffers | |
415 | and stores into each buffer that does not say it has a local value. */ | |
416 | ||
417 | extern struct buffer buffer_defaults; | |
418 | ||
419 | /* This structure marks which slots in a buffer have corresponding | |
420 | default values in buffer_defaults. | |
421 | Each such slot has a nonzero value in this structure. | |
422 | The value has only one nonzero bit. | |
423 | ||
424 | When a buffer has its own local value for a slot, | |
425 | the bit for that slot (found in the same slot in this structure) | |
426 | is turned on in the buffer's local_var_flags slot. | |
427 | ||
428 | If a slot in this structure is zero, then even though there may | |
440d350c | 429 | be a Lisp-level local variable for the slot, it has no default value, |
b3ec245a JB |
430 | and the corresponding slot in buffer_defaults is not used. */ |
431 | ||
432 | extern struct buffer buffer_local_flags; | |
433 | ||
434 | /* For each buffer slot, this points to the Lisp symbol name | |
435 | for that slot in the current buffer. It is 0 for slots | |
436 | that don't have such names. */ | |
437 | ||
438 | extern struct buffer buffer_local_symbols; | |
439 | ||
fbfed6f0 JB |
440 | /* This structure holds the required types for the values in the |
441 | buffer-local slots. If a slot contains Qnil, then the | |
442 | corresponding buffer slot may contain a value of any type. If a | |
443 | slot contains an integer, then prospective values' tags must be | |
444 | equal to that integer. When a tag does not match, the function | |
445 | buffer_slot_type_mismatch will signal an error. The value Qnil may | |
446 | always be safely stored in any slot. */ | |
ea47125f | 447 | extern struct buffer buffer_local_types; |
440d350c RS |
448 | \f |
449 | /* Point in the current buffer. This is an obsolete alias | |
450 | and should be eliminated. */ | |
c1ea566e | 451 | #define point (current_buffer->pt + 0) |
b3ec245a | 452 | |
440d350c | 453 | /* Return character at position n. No range checking. */ |
b3ec245a JB |
454 | #define FETCH_CHAR(n) *(((n)>= GPT ? GAP_SIZE : 0) + (n) + BEG_ADDR - 1) |
455 | ||
456 | /* BUFFER_CEILING_OF (resp. BUFFER_FLOOR_OF), when applied to n, return | |
457 | the max (resp. min) p such that | |
458 | ||
459 | &FETCH_CHAR (p) - &FETCH_CHAR (n) == p - n */ | |
460 | ||
461 | #define BUFFER_CEILING_OF(n) (((n) < GPT && GPT < ZV ? GPT : ZV) - 1) | |
462 | #define BUFFER_FLOOR_OF(n) (BEGV <= GPT && GPT <= (n) ? GPT : BEGV) | |
463 | ||
464 | extern void reset_buffer (); | |
74e88815 | 465 | extern void evaporate_overlays (); |
b3ec245a | 466 | |
440d350c RS |
467 | extern Lisp_Object Fbuffer_name (); |
468 | extern Lisp_Object Fget_file_buffer (); | |
023c80d0 | 469 | extern Lisp_Object Fnext_overlay_change (); |
5a10939a | 470 | extern Lisp_Object Fdelete_overlay (); |
440d350c | 471 | |
c1ea566e | 472 | /* Functions to call before and after each text change. */ |
b3ec245a JB |
473 | extern Lisp_Object Vbefore_change_function; |
474 | extern Lisp_Object Vafter_change_function; | |
03c6309a RS |
475 | extern Lisp_Object Vbefore_change_functions; |
476 | extern Lisp_Object Vafter_change_functions; | |
dbc4e1c1 JB |
477 | extern Lisp_Object Vfirst_change_hook; |
478 | extern Lisp_Object Qfirst_change_hook; | |
b3ec245a | 479 | |
83ec8b67 RS |
480 | extern Lisp_Object Vdeactivate_mark; |
481 | extern Lisp_Object Vtransient_mark_mode; | |
440d350c RS |
482 | \f |
483 | /* Overlays */ | |
484 | ||
d00c875c | 485 | /* 1 if the OV is an overlay object. */ |
6c523803 | 486 | #define OVERLAY_VALID(OV) (OVERLAYP (OV)) |
b3ec245a | 487 | |
440d350c | 488 | /* Return the marker that stands for where OV starts in the buffer. */ |
21f7c864 | 489 | #define OVERLAY_START(OV) (XOVERLAY (OV)->start) |
b3ec245a | 490 | |
440d350c | 491 | /* Return the marker that stands for where OV ends in the buffer. */ |
21f7c864 | 492 | #define OVERLAY_END(OV) (XOVERLAY (OV)->end) |
b3ec245a | 493 | |
d00c875c KH |
494 | /* Return the actual buffer position for the marker P. |
495 | We assume you know which buffer it's pointing into. */ | |
b3ec245a | 496 | |
915857ff KH |
497 | #define OVERLAY_POSITION(P) \ |
498 | (GC_MARKERP (P) ? marker_position (P) : (abort (), 0)) | |
b3ec245a | 499 | |
440d350c RS |
500 | /* Allocation of buffer text. */ |
501 | ||
b3ec245a JB |
502 | #ifdef REL_ALLOC |
503 | #define BUFFER_ALLOC(data,size) ((unsigned char *) r_alloc (&data, (size))) | |
504 | #define BUFFER_REALLOC(data,size) ((unsigned char *) r_re_alloc (&data, (size))) | |
505 | #define BUFFER_FREE(data) (r_alloc_free (&data)) | |
506 | #define R_ALLOC_DECLARE(var,data) (r_alloc_declare (&var, (data))) | |
507 | #else | |
508 | #define BUFFER_ALLOC(data,size) (data = (unsigned char *) malloc ((size))) | |
509 | #define BUFFER_REALLOC(data,size) ((unsigned char *) realloc ((data), (size))) | |
510 | #define BUFFER_FREE(data) (free ((data))) | |
511 | #define R_ALLOC_DECLARE(var,data) | |
512 | #endif |