Commit | Line | Data |
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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 | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
b3ec245a JB |
20 | |
21 | ||
1b92beaf JA |
22 | #ifdef USE_TEXT_PROPERTIES |
23 | #define SET_PT(position) (set_point ((position), current_buffer)) | |
24 | #define TEMP_SET_PT(position) (temp_set_point ((position), current_buffer)) | |
25 | ||
26 | #define BUF_SET_PT(buffer, position) (set_point ((position), (buffer))) | |
27 | #define BUF_TEMP_SET_PT(buffer, position) (temp_set_point ((position), (buffer))) | |
28 | ||
29 | #else /* don't support text properties */ | |
30 | ||
c1ea566e RS |
31 | #define SET_PT(position) (current_buffer->pt = (position)) |
32 | #define TEMP_SET_PT(position) (current_buffer->pt = (position)) | |
1b92beaf | 33 | |
c1ea566e RS |
34 | #define BUF_SET_PT(buffer, position) (buffer->pt = (position)) |
35 | #define BUF_TEMP_SET_PT(buffer, position) (buffer->pt = (position)) | |
1b92beaf | 36 | #endif /* don't support text properties */ |
b3ec245a JB |
37 | |
38 | /* Character position of beginning of buffer. */ | |
39 | #define BEG (1) | |
40 | ||
41 | /* Character position of beginning of accessible range of buffer. */ | |
c1ea566e | 42 | #define BEGV (current_buffer->begv) |
b3ec245a JB |
43 | |
44 | /* Character position of point in buffer. The "+ 0" makes this | |
45 | not an l-value, so you can't assign to it. Use SET_PT instead. */ | |
c1ea566e | 46 | #define PT (current_buffer->pt + 0) |
b3ec245a JB |
47 | |
48 | /* Character position of gap in buffer. */ | |
c1ea566e | 49 | #define GPT (current_buffer->text->gpt) |
b3ec245a JB |
50 | |
51 | /* Character position of end of accessible range of buffer. */ | |
c1ea566e | 52 | #define ZV (current_buffer->zv) |
b3ec245a JB |
53 | |
54 | /* Character position of end of buffer. */ | |
c1ea566e | 55 | #define Z (current_buffer->text->z) |
b3ec245a | 56 | |
e12f3519 ER |
57 | /* Is the current buffer narrowed? */ |
58 | #define NARROWED ((BEGV != BEG) || (ZV != Z)) | |
59 | ||
b3ec245a | 60 | /* Modification count. */ |
c1ea566e RS |
61 | #define MODIFF (current_buffer->text->modiff) |
62 | ||
2e50b9cc | 63 | /* Overlay modification count. */ |
d793b349 | 64 | #define OVERLAY_MODIFF (current_buffer->text->overlay_modiff) |
2e50b9cc | 65 | |
c1ea566e RS |
66 | /* Modification count as of last visit or save. */ |
67 | #define SAVE_MODIFF (current_buffer->text->save_modiff) | |
b3ec245a JB |
68 | |
69 | /* Address of beginning of buffer. */ | |
c1ea566e | 70 | #define BEG_ADDR (current_buffer->text->beg) |
b3ec245a JB |
71 | |
72 | /* Address of beginning of accessible range of buffer. */ | |
96b65d4e | 73 | #define BEGV_ADDR (POS_ADDR (current_buffer->begv)) |
b3ec245a JB |
74 | |
75 | /* Address of point in buffer. */ | |
96b65d4e | 76 | #define PT_ADDR (POS_ADDR (current_buffer->pt)) |
b3ec245a JB |
77 | |
78 | /* Address of beginning of gap in buffer. */ | |
c1ea566e | 79 | #define GPT_ADDR (current_buffer->text->beg + current_buffer->text->gpt - 1) |
b3ec245a JB |
80 | |
81 | /* Address of end of gap in buffer. */ | |
c1ea566e | 82 | #define GAP_END_ADDR (current_buffer->text->beg + current_buffer->text->gpt + current_buffer->text->gap_size - 1) |
b3ec245a JB |
83 | |
84 | /* Address of end of accessible range of buffer. */ | |
96b65d4e KH |
85 | #define ZV_ADDR (POS_ADDR (current_buffer->zv)) |
86 | ||
87 | /* Address of end of buffer. */ | |
88 | #define Z_ADDR (current_buffer->text->beg + current_buffer->text->gap_size + current_buffer->text->z - 1) | |
b3ec245a JB |
89 | |
90 | /* Size of gap. */ | |
c1ea566e | 91 | #define GAP_SIZE (current_buffer->text->gap_size) |
b3ec245a JB |
92 | |
93 | /* Now similar macros for a specified buffer. | |
94 | Note that many of these evaluate the buffer argument more than once. */ | |
95 | ||
96 | /* Character position of beginning of buffer. */ | |
97 | #define BUF_BEG(buf) (1) | |
98 | ||
99 | /* Character position of beginning of accessible range of buffer. */ | |
c1ea566e | 100 | #define BUF_BEGV(buf) ((buf)->begv) |
b3ec245a JB |
101 | |
102 | /* Character position of point in buffer. */ | |
c1ea566e | 103 | #define BUF_PT(buf) ((buf)->pt) |
b3ec245a JB |
104 | |
105 | /* Character position of gap in buffer. */ | |
c1ea566e | 106 | #define BUF_GPT(buf) ((buf)->text->gpt) |
b3ec245a JB |
107 | |
108 | /* Character position of end of accessible range of buffer. */ | |
c1ea566e | 109 | #define BUF_ZV(buf) ((buf)->zv) |
b3ec245a JB |
110 | |
111 | /* Character position of end of buffer. */ | |
c1ea566e | 112 | #define BUF_Z(buf) ((buf)->text->z) |
b3ec245a | 113 | |
e12f3519 | 114 | /* Is this buffer narrowed? */ |
c1ea566e RS |
115 | #define BUF_NARROWED(buf) ((BUF_BEGV (buf) != BUF_BEG (buf)) \ |
116 | || (BUF_ZV (buf) != BUF_Z (buf))) | |
e12f3519 | 117 | |
b3ec245a | 118 | /* Modification count. */ |
c1ea566e RS |
119 | #define BUF_MODIFF(buf) ((buf)->text->modiff) |
120 | ||
121 | /* Modification count as of last visit or save. */ | |
122 | #define BUF_SAVE_MODIFF(buf) ((buf)->text->save_modiff) | |
123 | ||
2e50b9cc RS |
124 | /* Overlay modification count. */ |
125 | #define BUF_OVERLAY_MODIFF(buf) ((buf)->text->overlay_modiff) | |
126 | ||
c1ea566e RS |
127 | /* Interval tree of buffer. */ |
128 | #define BUF_INTERVALS(buf) ((buf)->text->intervals) | |
129 | ||
130 | /* Marker chain of buffer. */ | |
131 | #define BUF_MARKERS(buf) ((buf)->text->markers) | |
b3ec245a JB |
132 | |
133 | /* Address of beginning of buffer. */ | |
c1ea566e | 134 | #define BUF_BEG_ADDR(buf) ((buf)->text->beg) |
b3ec245a | 135 | |
96b65d4e KH |
136 | /* Address of beginning of gap of buffer. */ |
137 | #define BUF_GPT_ADDR(buf) ((buf)->text->beg + (buf)->text->gpt - 1) | |
138 | ||
139 | /* Address of end of buffer. */ | |
140 | #define BUF_Z_ADDR(buf) ((buf)->text->beg + (buf)->text->gap_size + (buf)->text->z - 1) | |
141 | ||
b3ec245a JB |
142 | /* Macro for setting the value of BUF_ZV (BUF) to VALUE, |
143 | by varying the end of the accessible region. */ | |
c1ea566e RS |
144 | #define SET_BUF_ZV(buf, value) ((buf)->zv = (value)) |
145 | #define SET_BUF_PT(buf, value) ((buf)->pt = (value)) | |
b3ec245a JB |
146 | |
147 | /* Size of gap. */ | |
c1ea566e | 148 | #define BUF_GAP_SIZE(buf) ((buf)->text->gap_size) |
b3ec245a JB |
149 | |
150 | /* Return the address of character at position POS in buffer BUF. | |
151 | Note that both arguments can be computed more than once. */ | |
152 | #define BUF_CHAR_ADDRESS(buf, pos) \ | |
c1ea566e RS |
153 | ((buf)->text->beg + (pos) - 1 \ |
154 | + ((pos) >= (buf)->text->gpt ? (buf)->text->gap_size : 0)) | |
b3ec245a JB |
155 | |
156 | /* Convert the address of a char in the buffer into a character position. */ | |
157 | #define PTR_CHAR_POS(ptr) \ | |
c1ea566e RS |
158 | ((ptr) - (current_buffer)->text->beg \ |
159 | - (ptr - (current_buffer)->text->beg < (unsigned) GPT ? 0 : GAP_SIZE) \ | |
b3ec245a | 160 | + 1) |
790f39e7 RS |
161 | |
162 | /* Convert the address of a char in the buffer into a character position. */ | |
163 | #define BUF_PTR_CHAR_POS(buf, ptr) \ | |
c1ea566e RS |
164 | ((ptr) - (buf)->text->beg \ |
165 | - (ptr - (buf)->text->beg < (unsigned) BUF_GPT ((buf)) \ | |
790f39e7 RS |
166 | ? 0 : BUF_GAP_SIZE ((buf))) \ |
167 | + 1) | |
b3ec245a JB |
168 | \f |
169 | struct buffer_text | |
170 | { | |
c1ea566e RS |
171 | unsigned char *beg; /* Actual address of buffer contents. */ |
172 | int gpt; /* Index of gap in buffer. */ | |
173 | int z; /* Index of end of buffer. */ | |
174 | int gap_size; /* Size of buffer's gap. */ | |
b3ec245a JB |
175 | int modiff; /* This counts buffer-modification events |
176 | for this buffer. It is incremented for | |
177 | each such event, and never otherwise | |
178 | changed. */ | |
c1ea566e RS |
179 | int save_modiff; /* Previous value of modiff, as of last |
180 | time buffer visited or saved a file. */ | |
181 | ||
2e50b9cc RS |
182 | int overlay_modiff; /* Counts modifications to overlays. */ |
183 | ||
c1ea566e RS |
184 | /* Properties of this buffer's text -- conditionally compiled. */ |
185 | DECLARE_INTERVALS | |
186 | ||
187 | /* The markers that refer to this buffer. | |
188 | This is actually a single marker --- | |
189 | successive elements in its marker `chain' | |
190 | are the other markers referring to this buffer. */ | |
191 | Lisp_Object markers; | |
b3ec245a JB |
192 | }; |
193 | ||
194 | struct buffer | |
195 | { | |
196 | /* Everything before the `name' slot must be of a non-Lisp_Object type, | |
197 | and every slot after `name' must be a Lisp_Object. | |
198 | ||
c1ea566e RS |
199 | Check out mark_buffer (alloc.c) to see why. */ |
200 | ||
201 | EMACS_INT size; | |
b3ec245a | 202 | |
b3ec245a JB |
203 | /* Next buffer, in chain of all buffers including killed buffers. |
204 | This chain is used only for garbage collection, in order to | |
c1ea566e RS |
205 | collect killed buffers properly. |
206 | Note that vectors and most pseudovectors are all on one chain, | |
207 | but buffers are on a separate chain of their own. */ | |
b3ec245a | 208 | struct buffer *next; |
c1ea566e RS |
209 | |
210 | /* This structure holds the coordinates of the buffer contents | |
211 | in ordinary buffers. In indirect buffers, this is not used. */ | |
212 | struct buffer_text own_text; | |
213 | ||
214 | /* This points to the `struct buffer_text' that used for this buffer. | |
215 | In an ordinary buffer, this is the own_text field above. | |
216 | In an indirect buffer, this is the own_text field of another buffer. */ | |
217 | struct buffer_text *text; | |
218 | ||
219 | /* Position of point in buffer. */ | |
220 | int pt; | |
221 | /* Index of beginning of accessible range. */ | |
222 | int begv; | |
223 | /* Index of end of accessible range. */ | |
224 | int zv; | |
225 | ||
226 | /* In an indirect buffer, this points to the base buffer. | |
227 | In an ordinary buffer, it is 0. */ | |
228 | struct buffer *base_buffer; | |
229 | ||
b3ec245a JB |
230 | /* Flags saying which DEFVAR_PER_BUFFER variables |
231 | are local to this buffer. */ | |
232 | int local_var_flags; | |
b3ec245a JB |
233 | /* Set to the modtime of the visited file when read or written. |
234 | -1 means visited file was nonexistent. | |
235 | 0 means visited file modtime unknown; in no case complain | |
236 | about any mismatch on next save attempt. */ | |
237 | int modtime; | |
c1ea566e | 238 | /* the value of text->modiff at the last auto-save. */ |
b3ec245a | 239 | int auto_save_modified; |
4c0dc722 RS |
240 | /* The time at which we detected a failure to auto-save, |
241 | Or -1 if we didn't have a failure. */ | |
242 | int auto_save_failure_time; | |
b3ec245a | 243 | /* Position in buffer at which display started |
c1ea566e | 244 | the last time this buffer was displayed. */ |
b3ec245a JB |
245 | int last_window_start; |
246 | ||
715bde06 RS |
247 | /* Set nonzero whenever the narrowing is changed in this buffer. */ |
248 | int clip_changed; | |
249 | ||
18e93755 JB |
250 | /* If the long line scan cache is enabled (i.e. the buffer-local |
251 | variable cache-long-line-scans is non-nil), newline_cache | |
252 | points to the newline cache, and width_run_cache points to the | |
253 | width run cache. | |
254 | ||
255 | The newline cache records which stretches of the buffer are | |
256 | known *not* to contain newlines, so that they can be skipped | |
257 | quickly when we search for newlines. | |
258 | ||
259 | The width run cache records which stretches of the buffer are | |
260 | known to contain characters whose widths are all the same. If | |
261 | the width run cache maps a character to a value > 0, that value is | |
262 | the character's width; if it maps a character to zero, we don't | |
263 | know what its width is. This allows compute_motion to process | |
264 | such regions very quickly, using algebra instead of inspecting | |
265 | each character. See also width_table, below. */ | |
266 | struct region_cache *newline_cache; | |
267 | struct region_cache *width_run_cache; | |
b3ec245a JB |
268 | |
269 | /* Everything from here down must be a Lisp_Object */ | |
270 | ||
271 | ||
c1ea566e | 272 | /* The name of this buffer. */ |
b3ec245a | 273 | Lisp_Object name; |
c1ea566e | 274 | /* The name of the file visited in this buffer, or nil. */ |
b3ec245a | 275 | Lisp_Object filename; |
c1ea566e | 276 | /* Dir for expanding relative file names. */ |
b3ec245a | 277 | Lisp_Object directory; |
c1ea566e RS |
278 | /* True iff this buffer has been backed up (if you write to the |
279 | visited file and it hasn't been backed up, then a backup will | |
280 | be made). */ | |
b3ec245a JB |
281 | /* This isn't really used by the C code, so could be deleted. */ |
282 | Lisp_Object backed_up; | |
c1ea566e RS |
283 | /* Length of file when last read or saved. |
284 | This is not in the struct buffer_text | |
285 | because it's not used in indirect buffers at all. */ | |
b3ec245a | 286 | Lisp_Object save_length; |
c1ea566e RS |
287 | /* File name used for auto-saving this buffer. |
288 | This is not in the struct buffer_text | |
289 | because it's not used in indirect buffers at all. */ | |
b3ec245a | 290 | Lisp_Object auto_save_file_name; |
c1ea566e RS |
291 | |
292 | /* Non-nil if buffer read-only. */ | |
b3ec245a | 293 | Lisp_Object read_only; |
c1ea566e RS |
294 | /* "The mark". This is a marker which may |
295 | point into this buffer or may point nowhere. */ | |
b3ec245a JB |
296 | Lisp_Object mark; |
297 | ||
298 | /* Alist of elements (SYMBOL . VALUE-IN-THIS-BUFFER) | |
299 | for all per-buffer variables of this buffer. */ | |
300 | Lisp_Object local_var_alist; | |
301 | ||
c1ea566e | 302 | /* Symbol naming major mode (eg, lisp-mode). */ |
b3ec245a | 303 | Lisp_Object major_mode; |
c1ea566e | 304 | /* Pretty name of major mode (eg, "Lisp"). */ |
b3ec245a | 305 | Lisp_Object mode_name; |
c1ea566e | 306 | /* Mode line element that controls format of mode line. */ |
b3ec245a JB |
307 | Lisp_Object mode_line_format; |
308 | ||
c1ea566e | 309 | /* Keys that are bound local to this buffer. */ |
b3ec245a | 310 | Lisp_Object keymap; |
c1ea566e | 311 | /* This buffer's local abbrev table. */ |
b3ec245a | 312 | Lisp_Object abbrev_table; |
c1ea566e | 313 | /* This buffer's syntax table. */ |
b3ec245a | 314 | Lisp_Object syntax_table; |
96b65d4e KH |
315 | /* This buffer's category table. */ |
316 | Lisp_Object category_table; | |
b3ec245a JB |
317 | |
318 | /* Values of several buffer-local variables */ | |
319 | /* tab-width is buffer-local so that redisplay can find it | |
320 | in buffers that are not current */ | |
321 | Lisp_Object case_fold_search; | |
322 | Lisp_Object tab_width; | |
323 | Lisp_Object fill_column; | |
324 | Lisp_Object left_margin; | |
c1ea566e | 325 | /* Function to call when insert space past fill column. */ |
b3ec245a | 326 | Lisp_Object auto_fill_function; |
c1ea566e RS |
327 | /* nil: text, t: binary. |
328 | This value is meaningful only on certain operating systems. */ | |
96b65d4e KH |
329 | /* Actually, we don't need this flag any more because end-of-line |
330 | is handled correctly according to the buffer-file-coding-system | |
331 | of the buffer. Just keeping it for backward compatibility. */ | |
54ad07d3 | 332 | Lisp_Object buffer_file_type; |
b3ec245a | 333 | |
f392937f RS |
334 | /* Case table for case-conversion in this buffer. |
335 | This char-table maps each char into its lower-case version. */ | |
b3ec245a | 336 | Lisp_Object downcase_table; |
f392937f | 337 | /* Char-table mapping each char to its upper-case version. */ |
b3ec245a | 338 | Lisp_Object upcase_table; |
f392937f | 339 | /* Char-table for conversion for case-folding search. */ |
c1ea566e | 340 | Lisp_Object case_canon_table; |
f392937f | 341 | /* Char-table of equivalences for case-folding search. */ |
c1ea566e | 342 | Lisp_Object case_eqv_table; |
b3ec245a | 343 | |
c1ea566e | 344 | /* Non-nil means do not display continuation lines. */ |
b3ec245a | 345 | Lisp_Object truncate_lines; |
c1ea566e | 346 | /* Non-nil means display ctl chars with uparrow. */ |
b3ec245a | 347 | Lisp_Object ctl_arrow; |
96b65d4e KH |
348 | /* Non-nil means display text from right to left. */ |
349 | Lisp_Object direction_reversed; | |
b3ec245a | 350 | /* Non-nil means do selective display; |
c1ea566e | 351 | see doc string in syms_of_buffer (buffer.c) for details. */ |
b3ec245a JB |
352 | Lisp_Object selective_display; |
353 | #ifndef old | |
354 | /* Non-nil means show ... at end of line followed by invisible lines. */ | |
355 | Lisp_Object selective_display_ellipses; | |
356 | #endif | |
c1ea566e | 357 | /* Alist of (FUNCTION . STRING) for each minor mode enabled in buffer. */ |
b3ec245a | 358 | Lisp_Object minor_modes; |
6bbb0d4a JB |
359 | /* t if "self-insertion" should overwrite; `binary' if it should also |
360 | overwrite newlines and tabs - for editing executables and the like. */ | |
b3ec245a | 361 | Lisp_Object overwrite_mode; |
c1ea566e | 362 | /* non-nil means abbrev mode is on. Expand abbrevs automatically. */ |
b3ec245a | 363 | Lisp_Object abbrev_mode; |
c1ea566e | 364 | /* Display table to use for text in this buffer. */ |
b3ec245a | 365 | Lisp_Object display_table; |
83ec8b67 RS |
366 | /* t means the mark and region are currently active. */ |
367 | Lisp_Object mark_active; | |
b3ec245a | 368 | |
c1ea566e RS |
369 | /* Changes in the buffer are recorded here for undo. |
370 | t means don't record anything. | |
371 | This information belongs to the base buffer of an indirect buffer, | |
372 | But we can't store it in the struct buffer_text | |
373 | because local variables have to be right in the struct buffer. | |
374 | So we copy it around in set_buffer_internal. */ | |
375 | Lisp_Object undo_list; | |
376 | ||
440d350c RS |
377 | /* List of overlays that end at or before the current center, |
378 | in order of end-position. */ | |
379 | Lisp_Object overlays_before; | |
380 | ||
381 | /* List of overlays that end after the current center, | |
382 | in order of start-position. */ | |
383 | Lisp_Object overlays_after; | |
384 | ||
385 | /* Position where the overlay lists are centered. */ | |
386 | Lisp_Object overlay_center; | |
18e93755 | 387 | |
96b65d4e KH |
388 | /* Non-nil means the buffer contents are regarded as multi-byte |
389 | form of characters, not a binary code. */ | |
390 | Lisp_Object enable_multibyte_characters; | |
391 | ||
c204d14f KH |
392 | /* Coding system to be used for encoding the buffer contents on |
393 | saving. */ | |
394 | Lisp_Object buffer_file_coding_system; | |
395 | ||
2d2972d8 | 396 | /* List of symbols naming the file format used for visited file. */ |
585b0a89 BG |
397 | Lisp_Object file_format; |
398 | ||
18e93755 JB |
399 | /* True if the newline position cache and width run cache are |
400 | enabled. See search.c and indent.c. */ | |
401 | Lisp_Object cache_long_line_scans; | |
402 | ||
403 | /* If the width run cache is enabled, this table contains the | |
404 | character widths width_run_cache (see above) assumes. When we | |
405 | do a thorough redisplay, we compare this against the buffer's | |
406 | current display table to see whether the display table has | |
407 | affected the widths of any characters. If it has, we | |
c1ea566e | 408 | invalidate the width run cache, and re-initialize width_table. */ |
18e93755 | 409 | Lisp_Object width_table; |
c1ea566e RS |
410 | |
411 | /* In an indirect buffer, or a buffer that is the base of an | |
412 | indirect buffer, this holds a marker that records | |
413 | PT for this buffer when the buffer is not current. */ | |
414 | Lisp_Object pt_marker; | |
415 | ||
416 | /* In an indirect buffer, or a buffer that is the base of an | |
417 | indirect buffer, this holds a marker that records | |
418 | BEGV for this buffer when the buffer is not current. */ | |
419 | Lisp_Object begv_marker; | |
420 | ||
421 | /* In an indirect buffer, or a buffer that is the base of an | |
422 | indirect buffer, this holds a marker that records | |
423 | ZV for this buffer when the buffer is not current. */ | |
424 | Lisp_Object zv_marker; | |
2e4a1e1f RS |
425 | |
426 | /* This holds the point value before the last scroll operation. | |
427 | Explicitly setting point sets this to nil. */ | |
428 | Lisp_Object point_before_scroll; | |
8eb34fb9 RS |
429 | |
430 | /* Truename of the visited file, or nil. */ | |
431 | Lisp_Object file_truename; | |
4abe97d9 RS |
432 | |
433 | /* Invisibility spec of this buffer. | |
434 | t => any non-nil `invisible' property means invisible. | |
435 | A list => `invisible' property means invisible | |
436 | if it is memq in that list. */ | |
437 | Lisp_Object invisibility_spec; | |
637df16f | 438 | |
519052f3 RS |
439 | /* This is the last window that was selected with this buffer in it, |
440 | or nil if that window no longer displays this buffer. */ | |
441 | Lisp_Object last_selected_window; | |
442 | ||
f809d162 RS |
443 | /* Incremented each time the buffer is displayed in a window. */ |
444 | Lisp_Object display_count; | |
445 | ||
637df16f RS |
446 | /* These are so we don't have to recompile everything |
447 | the next few times we add a new slot. */ | |
519052f3 | 448 | Lisp_Object extra2, extra3; |
c1ea566e | 449 | }; |
440d350c RS |
450 | \f |
451 | /* This points to the current buffer. */ | |
b3ec245a JB |
452 | |
453 | extern struct buffer *current_buffer; | |
454 | ||
455 | /* This structure holds the default values of the buffer-local variables | |
440d350c | 456 | that have special slots in each buffer. |
b3ec245a JB |
457 | The default value occupies the same slot in this structure |
458 | as an individual buffer's value occupies in that buffer. | |
459 | Setting the default value also goes through the alist of buffers | |
460 | and stores into each buffer that does not say it has a local value. */ | |
461 | ||
462 | extern struct buffer buffer_defaults; | |
463 | ||
464 | /* This structure marks which slots in a buffer have corresponding | |
465 | default values in buffer_defaults. | |
466 | Each such slot has a nonzero value in this structure. | |
467 | The value has only one nonzero bit. | |
468 | ||
469 | When a buffer has its own local value for a slot, | |
470 | the bit for that slot (found in the same slot in this structure) | |
471 | is turned on in the buffer's local_var_flags slot. | |
472 | ||
473 | If a slot in this structure is zero, then even though there may | |
440d350c | 474 | be a Lisp-level local variable for the slot, it has no default value, |
b3ec245a JB |
475 | and the corresponding slot in buffer_defaults is not used. */ |
476 | ||
477 | extern struct buffer buffer_local_flags; | |
478 | ||
479 | /* For each buffer slot, this points to the Lisp symbol name | |
480 | for that slot in the current buffer. It is 0 for slots | |
481 | that don't have such names. */ | |
482 | ||
483 | extern struct buffer buffer_local_symbols; | |
484 | ||
fbfed6f0 JB |
485 | /* This structure holds the required types for the values in the |
486 | buffer-local slots. If a slot contains Qnil, then the | |
487 | corresponding buffer slot may contain a value of any type. If a | |
488 | slot contains an integer, then prospective values' tags must be | |
489 | equal to that integer. When a tag does not match, the function | |
490 | buffer_slot_type_mismatch will signal an error. The value Qnil may | |
491 | always be safely stored in any slot. */ | |
ea47125f | 492 | extern struct buffer buffer_local_types; |
440d350c | 493 | \f |
96b65d4e KH |
494 | /* Return the address of position N. No range checking. */ |
495 | #define POS_ADDR(n) (((n)>= GPT ? GAP_SIZE : 0) + (n) + BEG_ADDR - 1) | |
496 | ||
497 | /* Return the byte at position N. No range checking. */ | |
498 | #define FETCH_BYTE(n) *(POS_ADDR ((n))) | |
499 | ||
500 | /* Variables used locally in FETCH_MULTIBYTE_CHAR. */ | |
501 | extern unsigned char *_fetch_multibyte_char_p; | |
502 | extern int _fetch_multibyte_char_len; | |
503 | ||
504 | /* Return character code of multi-byte form at position POS. If POS | |
505 | doesn't point the head of valid multi-byte form, only the byte at | |
506 | POS is returned. No range checking. */ | |
507 | ||
508 | #define FETCH_MULTIBYTE_CHAR(pos) \ | |
509 | (_fetch_multibyte_char_p = (((pos) >= GPT ? GAP_SIZE : 0) \ | |
510 | + (pos) + BEG_ADDR - 1), \ | |
511 | _fetch_multibyte_char_len = ((pos) >= GPT ? ZV : GPT) - (pos), \ | |
512 | STRING_CHAR (_fetch_multibyte_char_p, _fetch_multibyte_char_len)) | |
513 | ||
514 | /* Return character at position POS. No range checking. */ | |
515 | #define FETCH_CHAR(pos) \ | |
516 | (!NILP (current_buffer->enable_multibyte_characters) \ | |
517 | ? FETCH_MULTIBYTE_CHAR ((pos)) \ | |
518 | : FETCH_BYTE ((pos))) | |
b3ec245a JB |
519 | |
520 | /* BUFFER_CEILING_OF (resp. BUFFER_FLOOR_OF), when applied to n, return | |
521 | the max (resp. min) p such that | |
522 | ||
96b65d4e | 523 | POS_ADDR (p) - POS_ADDR (n) == p - n */ |
b3ec245a JB |
524 | |
525 | #define BUFFER_CEILING_OF(n) (((n) < GPT && GPT < ZV ? GPT : ZV) - 1) | |
526 | #define BUFFER_FLOOR_OF(n) (BEGV <= GPT && GPT <= (n) ? GPT : BEGV) | |
527 | ||
528 | extern void reset_buffer (); | |
74e88815 | 529 | extern void evaporate_overlays (); |
b3ec245a | 530 | |
440d350c RS |
531 | extern Lisp_Object Fbuffer_name (); |
532 | extern Lisp_Object Fget_file_buffer (); | |
023c80d0 | 533 | extern Lisp_Object Fnext_overlay_change (); |
5a10939a | 534 | extern Lisp_Object Fdelete_overlay (); |
440d350c | 535 | |
c1ea566e | 536 | /* Functions to call before and after each text change. */ |
b3ec245a JB |
537 | extern Lisp_Object Vbefore_change_function; |
538 | extern Lisp_Object Vafter_change_function; | |
03c6309a RS |
539 | extern Lisp_Object Vbefore_change_functions; |
540 | extern Lisp_Object Vafter_change_functions; | |
dbc4e1c1 | 541 | extern Lisp_Object Vfirst_change_hook; |
23f73711 RS |
542 | extern Lisp_Object Qbefore_change_functions; |
543 | extern Lisp_Object Qafter_change_functions; | |
dbc4e1c1 | 544 | extern Lisp_Object Qfirst_change_hook; |
b3ec245a | 545 | |
83ec8b67 RS |
546 | extern Lisp_Object Vdeactivate_mark; |
547 | extern Lisp_Object Vtransient_mark_mode; | |
440d350c RS |
548 | \f |
549 | /* Overlays */ | |
550 | ||
d00c875c | 551 | /* 1 if the OV is an overlay object. */ |
6c523803 | 552 | #define OVERLAY_VALID(OV) (OVERLAYP (OV)) |
b3ec245a | 553 | |
440d350c | 554 | /* Return the marker that stands for where OV starts in the buffer. */ |
21f7c864 | 555 | #define OVERLAY_START(OV) (XOVERLAY (OV)->start) |
b3ec245a | 556 | |
440d350c | 557 | /* Return the marker that stands for where OV ends in the buffer. */ |
21f7c864 | 558 | #define OVERLAY_END(OV) (XOVERLAY (OV)->end) |
b3ec245a | 559 | |
d00c875c KH |
560 | /* Return the actual buffer position for the marker P. |
561 | We assume you know which buffer it's pointing into. */ | |
b3ec245a | 562 | |
915857ff KH |
563 | #define OVERLAY_POSITION(P) \ |
564 | (GC_MARKERP (P) ? marker_position (P) : (abort (), 0)) | |
b3ec245a | 565 | |
440d350c RS |
566 | /* Allocation of buffer text. */ |
567 | ||
b3ec245a JB |
568 | #ifdef REL_ALLOC |
569 | #define BUFFER_ALLOC(data,size) ((unsigned char *) r_alloc (&data, (size))) | |
570 | #define BUFFER_REALLOC(data,size) ((unsigned char *) r_re_alloc (&data, (size))) | |
571 | #define BUFFER_FREE(data) (r_alloc_free (&data)) | |
572 | #define R_ALLOC_DECLARE(var,data) (r_alloc_declare (&var, (data))) | |
573 | #else | |
574 | #define BUFFER_ALLOC(data,size) (data = (unsigned char *) malloc ((size))) | |
575 | #define BUFFER_REALLOC(data,size) ((unsigned char *) realloc ((data), (size))) | |
576 | #define BUFFER_FREE(data) (free ((data))) | |
577 | #define R_ALLOC_DECLARE(var,data) | |
578 | #endif |