1 /* Buffer manipulation primitives for XEmacs.
2 Copyright (C) 1985-1989, 1992-1995 Free Software Foundation, Inc.
3 Copyright (C) 1995 Sun Microsystems, Inc.
4 Copyright (C) 1995, 1996 Ben Wing.
6 This file is part of XEmacs.
8 XEmacs is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 2, or (at your option) any
13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with XEmacs; see the file COPYING. If not, write to
20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 /* Synched up with: Mule 2.0, FSF 19.30. */
28 JWZ: some changes for Lemacs, long ago. (e.g. separate buffer
30 Mly: a few changes for buffer-local vars, 19.8 or 19.9.
31 Ben Wing: some changes and cleanups for Mule, 19.12.
34 /* This file contains functions that work with buffer objects.
35 Functions that manipulate a buffer's text, however, are not
38 1) The low-level functions that actually know about the
39 implementation of a buffer's text are located in insdel.c.
40 2) The higher-level (mostly Lisp) functions that manipulate a
41 buffer's text are in editfns.c.
42 3) The highest-level Lisp commands are in cmds.c.
46 -- Functions that know about syntax tables (forward-word,
47 scan-sexps, etc.) are in syntax.c, as are functions
48 that manipulate syntax tables.
49 -- Functions that know about case tables (upcase, downcase,
50 etc.) are in casefiddle.c. Functions that manipulate
51 case tables (case-table-p, set-case-table, etc.) are
53 -- Functions that do searching and replacing are in
54 search.c. The low-level functions that implement
55 regular expressions are in regex.c.
59 -- Some file and process functions (in fileio.c and process.c)
60 copy text from or insert text into a buffer; they call
61 low-level functions in insdel.c to do this.
62 -- insdel.c calls low-level functions in undo.c and extents.c
63 to record buffer modifications for undoing and to handle
64 extent adjustment and extent-data creation and insertion.
78 #include "file-coding.h"
83 #include "process.h" /* for kill_buffer_processes */
84 #ifdef REGION_CACHE_NEEDS_WORK
85 #include "region-cache.h"
87 #include "specifier.h"
89 #include "sysdep.h" /* for getwd */
94 struct buffer *current_buffer; /* the current buffer */
96 /* This structure holds the default values of the buffer-local variables
97 defined with DEFVAR_BUFFER_LOCAL, that have special slots in each buffer.
98 The default value occupies the same slot in this structure
99 as an individual buffer's value occupies in that buffer.
100 Setting the default value also goes through the alist of buffers
101 and stores into each buffer that does not say it has a local value. */
102 Lisp_Object Vbuffer_defaults;
103 static void *buffer_defaults_saved_slots;
105 /* This structure marks which slots in a buffer have corresponding
106 default values in Vbuffer_defaults.
107 Each such slot has a nonzero value in this structure.
108 The value has only one nonzero bit.
110 When a buffer has its own local value for a slot,
111 the bit for that slot (found in the same slot in this structure)
112 is turned on in the buffer's local_var_flags slot.
114 If a slot in this structure is 0, then there is a DEFVAR_BUFFER_LOCAL
115 for the slot, but there is no default value for it; the corresponding
116 slot in Vbuffer_defaults is not used except to initialize newly-created
119 If a slot is -1, then there is a DEFVAR_BUFFER_LOCAL for it
120 as well as a default value which is used to initialize newly-created
121 buffers and as a reset-value when local-vars are killed.
123 If a slot is -2, there is no DEFVAR_BUFFER_LOCAL for it.
124 (The slot is always local, but there's no lisp variable for it.)
125 The default value is only used to initialize newly-creation buffers.
127 If a slot is -3, then there is no DEFVAR_BUFFER_LOCAL for it but
128 there is a default which is used to initialize newly-creation
129 buffers and as a reset-value when local-vars are killed. */
130 struct buffer buffer_local_flags;
132 /* This is the initial (startup) directory, as used for the *scratch* buffer.
133 We're making this a global to make others aware of the startup directory.
134 `initial_directory' is stored in external format.
136 char initial_directory[MAXPATHLEN+1];
138 /* This structure holds the names of symbols whose values may be
139 buffer-local. It is indexed and accessed in the same way as the above. */
140 static Lisp_Object Vbuffer_local_symbols;
141 static void *buffer_local_symbols_saved_slots;
143 /* Alist of all buffer names vs the buffers. */
144 /* This used to be a variable, but is no longer,
145 to prevent lossage due to user rplac'ing this alist or its elements.
146 Note that there is a per-frame copy of this as well; the frame slot
147 and the global variable contain the same data, but possibly in different
148 orders, so that the buffer ordering can be per-frame.
150 Lisp_Object Vbuffer_alist;
152 /* Functions to call before and after each text change. */
153 Lisp_Object Qbefore_change_functions;
154 Lisp_Object Qafter_change_functions;
155 Lisp_Object Vbefore_change_functions;
156 Lisp_Object Vafter_change_functions;
158 /* #### Obsolete, for compatibility */
159 Lisp_Object Qbefore_change_function;
160 Lisp_Object Qafter_change_function;
161 Lisp_Object Vbefore_change_function;
162 Lisp_Object Vafter_change_function;
165 Lisp_Object Vtransient_mark_mode;
168 /* t means ignore all read-only text properties.
169 A list means ignore such a property if its value is a member of the list.
170 Any non-nil value means ignore buffer-read-only. */
171 Lisp_Object Vinhibit_read_only;
173 /* List of functions to call that can query about killing a buffer.
174 If any of these functions returns nil, we don't kill it. */
175 Lisp_Object Vkill_buffer_query_functions;
177 /* Non-nil means delete a buffer's auto-save file when the buffer is saved. */
178 int delete_auto_save_files;
180 Lisp_Object Qbuffer_live_p;
181 Lisp_Object Qbuffer_or_string_p;
183 /* List of functions to call before changing an unmodified buffer. */
184 Lisp_Object Vfirst_change_hook;
185 Lisp_Object Qfirst_change_hook;
187 Lisp_Object Qfundamental_mode;
188 Lisp_Object Qmode_class;
189 Lisp_Object Qpermanent_local;
191 Lisp_Object Qprotected_field;
193 Lisp_Object QSFundamental; /* A string "Fundamental" */
194 Lisp_Object QSscratch; /* "*scratch*" */
195 Lisp_Object Qdefault_directory;
197 Lisp_Object Qkill_buffer_hook;
199 Lisp_Object Qrename_auto_save_file;
201 Lisp_Object Qget_file_buffer;
202 Lisp_Object Qchange_major_mode_hook, Vchange_major_mode_hook;
204 Lisp_Object Qfind_file_compare_truenames;
206 Lisp_Object Qswitch_to_buffer;
208 /* Two thresholds controlling how much undo information to keep. */
210 int undo_high_threshold;
212 int find_file_compare_truenames;
213 int find_file_use_truenames;
216 static void reset_buffer_local_variables (struct buffer *, int first_time);
217 static void nuke_all_buffer_slots (struct buffer *b, Lisp_Object zap);
220 make_buffer (struct buffer *buf)
223 XSETBUFFER (obj, buf);
228 mark_buffer (Lisp_Object obj)
230 struct buffer *buf = XBUFFER (obj);
232 /* Truncate undo information. */
233 buf->undo_list = truncate_undo_list (buf->undo_list,
235 undo_high_threshold);
237 #define MARKED_SLOT(x) mark_object (buf->x)
238 #include "bufslots.h"
241 mark_object (buf->extent_info);
243 mark_object (buf->text->line_number_cache);
245 /* Don't mark normally through the children slot.
246 (Actually, in this case, it doesn't matter.) */
247 if (! EQ (buf->indirect_children, Qnull_pointer))
248 mark_conses_in_list (buf->indirect_children);
250 return buf->base_buffer ? make_buffer (buf->base_buffer) : Qnil;
254 print_buffer (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
256 struct buffer *b = XBUFFER (obj);
260 if (!BUFFER_LIVE_P (b))
261 error ("printing unreadable object #<killed buffer>");
263 error ("printing unreadable object #<buffer %s>",
264 XSTRING_DATA (b->name));
266 else if (!BUFFER_LIVE_P (b))
267 write_c_string ("#<killed buffer>", printcharfun);
270 write_c_string ("#<buffer ", printcharfun);
271 print_internal (b->name, printcharfun, 1);
272 write_c_string (">", printcharfun);
276 print_internal (b->name, printcharfun, 0);
280 /* We do not need a finalize method to handle a buffer's children list
281 because all buffers have `kill-buffer' applied to them before
282 they disappear, and the children removal happens then. */
283 DEFINE_LRECORD_IMPLEMENTATION ("buffer", buffer,
284 mark_buffer, print_buffer, 0, 0, 0, 0,
287 DEFUN ("bufferp", Fbufferp, 1, 1, 0, /*
288 Return t if OBJECT is an editor buffer.
292 return BUFFERP (object) ? Qt : Qnil;
295 DEFUN ("buffer-live-p", Fbuffer_live_p, 1, 1, 0, /*
296 Return t if OBJECT is an editor buffer that has not been deleted.
300 return BUFFERP (object) && BUFFER_LIVE_P (XBUFFER (object)) ? Qt : Qnil;
304 nsberror (Lisp_Object spec)
307 error ("No buffer named %s", XSTRING_DATA (spec));
308 signal_simple_error ("Invalid buffer argument", spec);
311 DEFUN ("buffer-list", Fbuffer_list, 0, 1, 0, /*
312 Return a list of all existing live buffers.
313 The order is specific to the selected frame; if the optional FRAME
314 argument is provided, the ordering for that frame is returned instead.
315 If the FRAME argument is t, then the global (non-frame) ordering is
320 return Fmapcar (Qcdr,
321 EQ (frame, Qt) ? Vbuffer_alist :
322 decode_frame (frame)->buffer_alist);
326 get_buffer (Lisp_Object name, int error_if_deleted_or_does_not_exist)
330 if (!BUFFER_LIVE_P (XBUFFER (name)))
332 if (error_if_deleted_or_does_not_exist)
344 name = LISP_GETTEXT (name); /* I18N3 */
346 buf = Fcdr (Fassoc (name, Vbuffer_alist));
348 if (NILP (buf) && error_if_deleted_or_does_not_exist)
355 decode_buffer (Lisp_Object buffer, int allow_string)
358 return current_buffer;
360 if (allow_string && STRINGP (buffer))
361 return XBUFFER (get_buffer (buffer, 1));
363 CHECK_LIVE_BUFFER (buffer);
364 return XBUFFER (buffer);
367 DEFUN ("decode-buffer", Fdecode_buffer, 1, 1, 0, /*
368 Validate BUFFER or if BUFFER is nil, return the current buffer.
369 If BUFFER is a valid buffer or a string representing a valid buffer,
370 the corresponding buffer object will be returned. Otherwise an error
375 struct buffer *b = decode_buffer (buffer, 1);
376 XSETBUFFER (buffer, b);
382 /* Like Fassoc, but use Fstring_equal to compare
383 (which ignores text properties),
384 and don't ever QUIT. */
387 assoc_ignore_text_properties (REGISTER Lisp_Object key, Lisp_Object list)
389 REGISTER Lisp_Object tail;
390 for (tail = list; !NILP (tail); tail = Fcdr (tail))
392 REGISTER Lisp_Object elt, tem;
394 tem = Fstring_equal (Fcar (elt), key);
403 DEFUN ("get-buffer", Fget_buffer, 1, 1, 0, /*
404 Return the buffer named NAME (a string).
405 If there is no live buffer named NAME, return nil.
406 NAME may also be a buffer; if so, the value is that buffer.
411 /* #### Doc string should indicate that the buffer name will get
415 /* #### This might return a dead buffer. This is gross. This is
416 called FSF compatibility. */
419 return get_buffer (name, 0);
420 /* FSFmacs 19.29 calls assoc_ignore_text_properties() here.
425 DEFUN ("get-file-buffer", Fget_file_buffer, 1, 1, 0, /*
426 Return the buffer visiting file FILENAME (a string).
427 The buffer's `buffer-file-name' must match exactly the expansion of FILENAME.
428 If there is no such live buffer, return nil.
430 Normally, the comparison is done by canonicalizing FILENAME (using
431 `expand-file-name') and comparing that to the value of `buffer-file-name'
432 for each existing buffer. However, If `find-file-compare-truenames' is
433 non-nil, FILENAME will be converted to its truename and the search will be
434 done on each buffer's value of `buffer-file-truename' instead of
435 `buffer-file-name'. Otherwise, if `find-file-use-truenames' is non-nil,
436 FILENAME will be converted to its truename and used for searching, but
437 the search will still be done on `buffer-file-name'.
441 /* This function can GC. GC checked 1997.04.06. */
442 REGISTER Lisp_Object buf;
446 /* DO NOT translate the filename. */
449 CHECK_STRING (filename);
450 filename = Fexpand_file_name (filename, Qnil);
452 /* If the file name has special constructs in it,
453 call the corresponding file handler. */
454 Lisp_Object handler = Ffind_file_name_handler (filename, Qget_file_buffer);
458 return call2 (handler, Qget_file_buffer, filename);
463 if (find_file_compare_truenames || find_file_use_truenames)
465 struct gcpro ngcpro1, ngcpro2, ngcpro3;
466 Lisp_Object fn = Qnil;
467 Lisp_Object dn = Qnil;
469 NGCPRO3 (fn, dn, filename);
470 fn = Ffile_truename (filename, Qnil);
473 dn = Ffile_name_directory (filename);
474 fn = Ffile_truename (dn, Qnil);
475 if (! NILP (fn)) dn = fn;
476 fn = Fexpand_file_name (Ffile_name_nondirectory (filename),
485 LIST_LOOP_2 (elt, Vbuffer_alist)
488 if (!BUFFERP (buf)) continue;
489 if (!STRINGP (XBUFFER (buf)->filename)) continue;
490 if (!NILP (Fstring_equal (filename,
491 (find_file_compare_truenames
492 ? XBUFFER (buf)->file_truename
493 : XBUFFER (buf)->filename))))
502 push_buffer_alist (Lisp_Object name, Lisp_Object buf)
504 Lisp_Object cons = Fcons (name, buf);
505 Lisp_Object frmcons, devcons, concons;
507 Vbuffer_alist = nconc2 (Vbuffer_alist, Fcons (cons, Qnil));
508 FRAME_LOOP_NO_BREAK (frmcons, devcons, concons)
511 f = XFRAME (XCAR (frmcons));
512 f->buffer_alist = nconc2 (f->buffer_alist, Fcons (cons, Qnil));
517 delete_from_buffer_alist (Lisp_Object buf)
519 Lisp_Object cons = Frassq (buf, Vbuffer_alist);
520 Lisp_Object frmcons, devcons, concons;
522 return; /* abort() ? */
523 Vbuffer_alist = delq_no_quit (cons, Vbuffer_alist);
525 FRAME_LOOP_NO_BREAK (frmcons, devcons, concons)
528 f = XFRAME (XCAR (frmcons));
529 f->buffer_alist = delq_no_quit (cons, f->buffer_alist);
534 get_truename_buffer (REGISTER Lisp_Object filename)
536 /* FSFmacs has its own code here and doesn't call get-file-buffer.
537 That's because their equivalent of find-file-compare-truenames
538 (find-file-existing-other-name) isn't looked at in get-file-buffer.
539 This way is more correct. */
540 int count = specpdl_depth ();
542 specbind (Qfind_file_compare_truenames, Qt);
543 return unbind_to (count, Fget_file_buffer (filename));
546 static struct buffer *
547 allocate_buffer (void)
549 struct buffer *b = alloc_lcrecord_type (struct buffer, &lrecord_buffer);
551 copy_lcrecord (b, XBUFFER (Vbuffer_defaults));
557 finish_init_buffer (struct buffer *b, Lisp_Object name)
563 name = Fcopy_sequence (name);
564 /* #### This really does not need to be called. We already
565 initialized the buffer-local variables in allocate_buffer().
566 local_var_alist is set to Qnil at the same point, in
567 nuke_all_buffer_slots(). */
568 reset_buffer_local_variables (b, 1);
569 b->directory = current_buffer ? current_buffer->directory : Qnil;
571 b->last_window_start = 1;
574 if (string_byte (XSTRING (name), 0) != ' ')
579 /* initialize the extent list */
580 init_buffer_extents (b);
582 /* Put this in the alist of all live buffers. */
583 push_buffer_alist (name, buf);
585 init_buffer_markers (b);
587 b->generated_modeline_string = Fmake_string (make_int (84), make_int (' '));
588 b->modeline_extent_table = make_lisp_hash_table (20, HASH_TABLE_KEY_WEAK,
594 DEFUN ("get-buffer-create", Fget_buffer_create, 1, 1, 0, /*
595 Return the buffer named NAME, or create such a buffer and return it.
596 A new buffer is created if there is no live buffer named NAME.
597 If NAME starts with a space, the new buffer does not keep undo information.
598 If NAME is a buffer instead of a string, then it is the value returned.
599 The value is never nil.
603 /* This function can GC */
605 REGISTER struct buffer *b;
608 /* #### Doc string should indicate that the buffer name will get
612 name = LISP_GETTEXT (name);
613 buf = Fget_buffer (name);
617 if (XSTRING_LENGTH (name) == 0)
618 error ("Empty string for buffer name is not allowed");
620 b = allocate_buffer ();
622 b->text = &b->own_text;
624 b->indirect_children = Qnil;
625 init_buffer_text (b);
627 return finish_init_buffer (b, name);
630 DEFUN ("make-indirect-buffer", Fmake_indirect_buffer, 2, 2,
631 "bMake indirect buffer (to buffer): \nBName of indirect buffer: ", /*
632 Create and return an indirect buffer for buffer BASE, named NAME.
633 BASE should be an existing buffer (or buffer name).
634 NAME should be a string which is not the name of an existing buffer.
635 If BASE is an indirect buffer itself, the base buffer for that buffer
636 is made the base buffer for the newly created buffer. (Thus, there will
637 never be indirect buffers whose base buffers are themselves indirect.)
641 /* This function can GC */
643 /* #### The above interactive specification is totally bogus,
644 because it offers an existing buffer as default answer to the
645 second question. However, the second argument may not BE an
649 base_buffer = get_buffer (base_buffer, 1);
652 /* #### Doc string should indicate that the buffer name will get
656 name = LISP_GETTEXT (name);
657 if (!NILP (Fget_buffer (name)))
658 signal_simple_error ("Buffer name already in use", name);
659 if (XSTRING_LENGTH (name) == 0)
660 error ("Empty string for buffer name is not allowed");
662 b = allocate_buffer ();
664 b->base_buffer = BUFFER_BASE_BUFFER (XBUFFER (base_buffer));
666 /* Use the base buffer's text object. */
667 b->text = b->base_buffer->text;
668 b->indirect_children = Qnil;
669 b->base_buffer->indirect_children =
670 Fcons (make_buffer (b), b->base_buffer->indirect_children);
671 init_buffer_text (b);
673 return finish_init_buffer (b, name);
679 reset_buffer_local_variables (struct buffer *b, int first_time)
681 struct buffer *def = XBUFFER (Vbuffer_defaults);
683 b->local_var_flags = 0;
684 /* For each slot that has a default value,
685 copy that into the slot. */
686 #define MARKED_SLOT(slot) \
687 { int mask = XINT (buffer_local_flags.slot); \
688 if ((mask > 0 || mask == -1 || mask == -3) \
690 || NILP (Fget (XBUFFER (Vbuffer_local_symbols)->slot, \
691 Qpermanent_local, Qnil)))) \
692 b->slot = def->slot; \
694 #include "bufslots.h"
697 #define STRING256_P(obj) \
698 (STRINGP (obj) && XSTRING_CHAR_LENGTH (obj) == 256)
699 /* If the standard case table has been altered and invalidated,
700 fix up its insides first. */
701 if (!(STRING256_P(Vascii_upcase_table) &&
702 STRING256_P(Vascii_canon_table) &&
703 STRING256_P(Vascii_eqv_table)))
705 Fset_standard_case_table (Vascii_downcase_table);
707 b->downcase_table = Vascii_downcase_table;
708 b->upcase_table = Vascii_upcase_table;
709 b->case_canon_table = Vascii_canon_table;
710 b->case_eqv_table = Vascii_eqv_table;
712 b->mirror_downcase_table = Vmirror_ascii_downcase_table;
713 b->mirror_upcase_table = Vmirror_ascii_upcase_table;
714 b->mirror_case_canon_table = Vmirror_ascii_canon_table;
715 b->mirror_case_eqv_table = Vmirror_ascii_eqv_table;
721 /* We split this away from generate-new-buffer, because rename-buffer
722 and set-visited-file-name ought to be able to use this to really
723 rename the buffer properly. */
725 DEFUN ("generate-new-buffer-name", Fgenerate_new_buffer_name, 1, 2, 0, /*
726 Return a string that is the name of no existing buffer based on NAME.
727 If there is no live buffer named NAME, then return NAME.
728 Otherwise modify name by appending `<NUMBER>', incrementing NUMBER
729 until an unused name is found, and then return that name.
730 Optional second argument IGNORE specifies a name that is okay to use
731 \(if it is in the sequence to be tried)
732 even if a buffer with that name exists.
736 REGISTER Lisp_Object gentemp, tem;
742 name = LISP_GETTEXT (name);
744 /* #### Doc string should indicate that the buffer name will get
748 tem = Fget_buffer (name);
755 sprintf (number, "<%d>", ++count);
756 gentemp = concat2 (name, build_string (number));
759 tem = Fstring_equal (gentemp, ignore);
763 tem = Fget_buffer (gentemp);
770 DEFUN ("buffer-name", Fbuffer_name, 0, 1, 0, /*
771 Return the name of BUFFER, as a string.
772 With no argument or nil as argument, return the name of the current buffer.
776 /* For compatibility, we allow a dead buffer here.
777 Earlier versions of Emacs didn't provide buffer-live-p. */
779 return current_buffer->name;
780 CHECK_BUFFER (buffer);
781 return XBUFFER (buffer)->name;
784 DEFUN ("buffer-file-name", Fbuffer_file_name, 0, 1, 0, /*
785 Return name of file BUFFER is visiting, or nil if none.
786 No argument or nil as argument means use the current buffer.
790 /* For compatibility, we allow a dead buffer here. Yuck! */
792 return current_buffer->filename;
793 CHECK_BUFFER (buffer);
794 return XBUFFER (buffer)->filename;
797 DEFUN ("buffer-base-buffer", Fbuffer_base_buffer, 0, 1, 0, /*
798 Return the base buffer of indirect buffer BUFFER.
799 If BUFFER is not indirect, return nil.
803 struct buffer *buf = decode_buffer (buffer, 0);
805 return buf->base_buffer ? make_buffer (buf->base_buffer) : Qnil;
808 DEFUN ("buffer-indirect-children", Fbuffer_indirect_children, 0, 1, 0, /*
809 Return a list of all indirect buffers whose base buffer is BUFFER.
810 If BUFFER is indirect, the return value will always be nil; see
811 `make-indirect-buffer'.
815 struct buffer *buf = decode_buffer (buffer, 0);
817 return Fcopy_sequence (buf->indirect_children);
820 DEFUN ("buffer-local-variables", Fbuffer_local_variables, 0, 1, 0, /*
821 Return an alist of variables that are buffer-local in BUFFER.
822 Most elements look like (SYMBOL . VALUE), describing one variable.
823 For a symbol that is locally unbound, just the symbol appears in the value.
824 Note that storing new VALUEs in these elements doesn't change the variables.
825 No argument or nil as argument means use current buffer as BUFFER.
829 struct buffer *buf = decode_buffer (buffer, 0);
830 Lisp_Object result = Qnil;
834 for (tail = buf->local_var_alist; CONSP (tail); tail = XCDR (tail))
836 Lisp_Object elt = XCAR (tail);
837 /* Reference each variable in the alist in buf.
838 If inquiring about the current buffer, this gets the current values,
839 so store them into the alist so the alist is up to date.
840 If inquiring about some other buffer, this swaps out any values
841 for that buffer, making the alist up to date automatically. */
842 Lisp_Object val = find_symbol_value (XCAR (elt));
843 /* Use the current buffer value only if buf is the current buffer. */
844 if (buf != current_buffer)
847 /* If symbol is unbound, put just the symbol in the list. */
849 result = Fcons (XCAR (elt), result);
850 /* Otherwise, put (symbol . value) in the list. */
852 result = Fcons (Fcons (XCAR (elt), val), result);
856 /* Add on all the variables stored in special slots. */
858 struct buffer *syms = XBUFFER (Vbuffer_local_symbols);
859 #define MARKED_SLOT(slot) \
860 { int mask = XINT (buffer_local_flags.slot); \
861 if (mask == 0 || mask == -1 \
862 || ((mask > 0) && (buf->local_var_flags & mask))) \
863 result = Fcons (Fcons (syms->slot, buf->slot), result); \
865 #include "bufslots.h"
871 DEFUN ("buffer-dedicated-frame", Fbuffer_dedicated_frame, 0, 1, 0, /*
872 Return the frame dedicated to this BUFFER, or nil if there is none.
873 No argument or nil as argument means use current buffer as BUFFER.
877 struct buffer *buf = decode_buffer (buffer, 0);
879 /* XEmacs addition: if the frame is dead, silently make it go away. */
880 if (!NILP (buf->dedicated_frame) &&
881 !FRAME_LIVE_P (XFRAME (buf->dedicated_frame)))
882 buf->dedicated_frame = Qnil;
884 return buf->dedicated_frame;
887 DEFUN ("set-buffer-dedicated-frame", Fset_buffer_dedicated_frame, 2, 2, 0, /*
888 For this BUFFER, set the FRAME dedicated to it.
889 FRAME must be a frame or nil.
893 struct buffer *buf = decode_buffer (buffer, 0);
896 CHECK_LIVE_FRAME (frame); /* XEmacs change */
898 return buf->dedicated_frame = frame;
903 DEFUN ("buffer-modified-p", Fbuffer_modified_p, 0, 1, 0, /*
904 Return t if BUFFER was modified since its file was last read or saved.
905 No argument or nil as argument means use current buffer as BUFFER.
909 struct buffer *buf = decode_buffer (buffer, 0);
911 return BUF_SAVE_MODIFF (buf) < BUF_MODIFF (buf) ? Qt : Qnil;
914 DEFUN ("set-buffer-modified-p", Fset_buffer_modified_p, 1, 2, 0, /*
915 Mark BUFFER as modified or unmodified according to FLAG.
916 A non-nil FLAG means mark the buffer modified. No argument or nil
917 as BUFFER means use current buffer.
921 /* This function can GC */
922 struct buffer *buf = decode_buffer (buffer, 0);
924 #ifdef CLASH_DETECTION
925 /* If buffer becoming modified, lock the file.
926 If buffer becoming unmodified, unlock the file. */
928 Lisp_Object fn = buf->file_truename;
931 int already = BUF_SAVE_MODIFF (buf) < BUF_MODIFF (buf);
932 if (already == NILP (flag))
934 int count = specpdl_depth ();
935 /* lock_file() and unlock_file() currently use current_buffer */
936 /* #### - dmoore, what if lock_file or unlock_file kill
937 the current buffer? */
938 record_unwind_protect (Fset_buffer, Fcurrent_buffer ());
939 set_buffer_internal (buf);
940 if (!already && !NILP (flag))
942 else if (already && NILP (flag))
944 unbind_to (count, Qnil);
947 #endif /* CLASH_DETECTION */
949 /* This is often called when the buffer contents are altered but we
950 don't want to treat the changes that way (e.g. selective
951 display). We still need to make sure redisplay realizes that the
952 contents have potentially altered and it needs to do some
954 buf = decode_buffer(buffer, 0);
956 BUF_SAVE_MODIFF (buf) = NILP (flag) ? BUF_MODIFF (buf) : 0;
957 MARK_MODELINE_CHANGED;
962 DEFUN ("buffer-modified-tick", Fbuffer_modified_tick, 0, 1, 0, /*
963 Return BUFFER's tick counter, incremented for each change in text.
964 Each buffer has a tick counter which is incremented each time the text in
965 that buffer is changed. It wraps around occasionally.
966 No argument or nil as argument means use current buffer as BUFFER.
970 struct buffer *buf = decode_buffer (buffer, 0);
972 return make_int (BUF_MODIFF (buf));
975 DEFUN ("rename-buffer", Frename_buffer, 1, 2,
976 "sRename buffer (to new name): \nP", /*
977 Change current buffer's name to NEWNAME (a string).
978 If second arg UNIQUE is nil or omitted, it is an error if a
979 buffer named NEWNAME already exists.
980 If UNIQUE is non-nil, come up with a new name using
981 `generate-new-buffer-name'.
982 Interactively, one can set UNIQUE with a prefix argument.
983 Returns the name we actually gave the buffer.
984 This does not change the name of the visited file (if any).
988 /* This function can GC */
989 Lisp_Object tem, buf;
992 /* #### Doc string should indicate that the buffer name will get
995 CHECK_STRING (newname);
996 newname = LISP_GETTEXT (newname);
998 if (XSTRING_LENGTH (newname) == 0)
999 error ("Empty string is invalid as a buffer name");
1001 tem = Fget_buffer (newname);
1002 /* Don't short-circuit if UNIQUE is t. That is a useful way to rename
1003 the buffer automatically so you can create another with the original name.
1004 It makes UNIQUE equivalent to
1005 (rename-buffer (generate-new-buffer-name NEWNAME)). */
1006 /* XEmacs change: added check for nil */
1007 if (NILP (unique) && !NILP (tem) && XBUFFER (tem) == current_buffer)
1008 return current_buffer->name;
1012 newname = Fgenerate_new_buffer_name (newname, current_buffer->name);
1014 error ("Buffer name \"%s\" is in use",
1015 XSTRING_DATA (newname));
1018 current_buffer->name = newname;
1020 /* Catch redisplay's attention. Unless we do this, the modelines for
1021 any windows displaying current_buffer will stay unchanged. */
1022 MARK_MODELINE_CHANGED;
1024 buf = Fcurrent_buffer ();
1026 /* The aconses in the Vbuffer_alist are shared with frame->buffer_alist,
1027 so this will change it in the per-frame ordering as well. */
1028 Fsetcar (Frassq (buf, Vbuffer_alist), newname);
1030 if (NILP (current_buffer->filename)
1031 && !NILP (current_buffer->auto_save_file_name))
1032 call0 (Qrename_auto_save_file);
1033 /* refetch since that last call may have done GC */
1034 /* (hypothetical relocating GC) */
1035 return current_buffer->name;
1038 DEFUN ("other-buffer", Fother_buffer, 0, 3, 0, /*
1039 Return most recently selected buffer other than BUFFER.
1040 Buffers not visible in windows are preferred to visible buffers,
1041 unless optional third argument VISIBLE-OK is non-nil.
1042 If no other buffer exists, the buffer `*scratch*' is returned.
1043 If BUFFER is omitted or nil, some interesting buffer is returned.
1045 The ordering is for this frame; If second optional argument FRAME
1046 is provided, then the ordering is for that frame. If the second arg
1047 is t, then the global ordering is returned.
1049 Note: In FSF Emacs, this function takes two arguments: BUFFER and
1052 (buffer, frame, visible_ok))
1054 /* This function can GC */
1055 Lisp_Object tail, buf, notsogood, tem;
1061 alist = Vbuffer_alist;
1064 struct frame *f = decode_frame (frame);
1066 XSETFRAME (frame, f);
1067 alist = f->buffer_alist;
1070 for (tail = alist; !NILP (tail); tail = Fcdr (tail))
1072 buf = Fcdr (Fcar (tail));
1073 if (EQ (buf, buffer))
1075 if (string_byte (XSTRING (XBUFFER (buf)->name), 0) == ' ')
1077 /* If FRAME has a buffer_predicate,
1078 disregard buffers that don't fit the predicate. */
1081 tem = XFRAME (frame)->buffer_predicate;
1084 tem = call1 (tem, buf);
1090 if (NILP (visible_ok))
1092 /* get-buffer-window will handle nil or t frame */
1093 tem = Fget_buffer_window (buf, frame, Qnil);
1099 if (NILP (notsogood))
1102 if (!NILP (notsogood))
1104 return Fget_buffer_create (QSscratch);
1107 DEFUN ("buffer-disable-undo", Fbuffer_disable_undo, 0, 1, "", /*
1108 Make BUFFER stop keeping undo information.
1109 Any undo records it already has are discarded.
1110 No argument or nil as argument means do this for the current buffer.
1114 /* Allowing nil is an RMSism */
1115 struct buffer *real_buf = decode_buffer (buffer, 1);
1116 real_buf->undo_list = Qt;
1120 DEFUN ("buffer-enable-undo", Fbuffer_enable_undo, 0, 1, "", /*
1121 Start keeping undo information for buffer BUFFER.
1122 No argument or nil as argument means do this for the current buffer.
1126 /* Allowing nil is an RMSism */
1127 struct buffer *real_buf = decode_buffer (buffer, 1);
1128 if (EQ (real_buf->undo_list, Qt))
1129 real_buf->undo_list = Qnil;
1134 DEFUN ("kill-buffer", Fkill_buffer, 1, 1, "bKill buffer: ", /*
1135 Kill the buffer BUFFER.
1136 The argument may be a buffer or may be the name of a buffer.
1137 An argument of nil means kill the current buffer.
1139 Value is t if the buffer is actually killed, nil if user says no.
1141 The value of `kill-buffer-hook' (which may be local to that buffer),
1142 if not void, is a list of functions to be called, with no arguments,
1143 before the buffer is actually killed. The buffer to be killed is current
1144 when the hook functions are called.
1146 Any processes that have this buffer as the `process-buffer' are killed
1147 with `delete-process'.
1151 /* This function can call lisp */
1153 REGISTER struct buffer *b;
1154 struct gcpro gcpro1, gcpro2;
1157 buf = Fcurrent_buffer ();
1158 else if (BUFFERP (buffer))
1162 buf = get_buffer (buffer, 0);
1163 if (NILP (buf)) nsberror (buffer);
1168 /* OK to delete an already-deleted buffer. */
1169 if (!BUFFER_LIVE_P (b))
1172 /* Don't kill the minibuffer now current. */
1173 if (EQ (buf, Vminibuffer_zero))
1176 /* Or the echo area. */
1177 if (EQ (buf, Vecho_area_buffer))
1180 /* Query if the buffer is still modified. */
1181 if (INTERACTIVE && !NILP (b->filename)
1182 && BUF_MODIFF (b) > BUF_SAVE_MODIFF (b))
1188 (emacs_doprnt_string_c
1189 ((const Bufbyte *) GETTEXT ("Buffer %s modified; kill anyway? "),
1190 Qnil, -1, XSTRING_DATA (b->name))));
1194 b = XBUFFER (buf); /* Hypothetical relocating GC. */
1197 /* Run hooks with the buffer to be killed temporarily selected,
1198 unless the buffer is already dead (could have been deleted
1199 in the question above).
1201 if (BUFFER_LIVE_P (b))
1203 int speccount = specpdl_depth ();
1204 Lisp_Object tail = Qnil;
1207 record_unwind_protect (save_excursion_restore, save_excursion_save ());
1210 /* First run the query functions; if any query is answered no,
1211 don't kill the buffer. */
1212 EXTERNAL_LIST_LOOP (tail, Vkill_buffer_query_functions)
1214 if (NILP (call0 (Fcar (tail))))
1217 return unbind_to (speccount, Qnil);
1221 /* Then run the hooks. */
1222 run_hook (Qkill_buffer_hook);
1223 #ifdef HAVE_X_WINDOWS
1224 /* If an X selection was in this buffer, disown it.
1225 We could have done this by simply adding this function to the
1226 kill-buffer-hook, but the user might mess that up.
1228 if (EQ (Vwindow_system, Qx))
1229 call0 (intern ("xselect-kill-buffer-hook"));
1230 /* #### generalize me! */
1231 #endif /* HAVE_X_WINDOWS */
1232 unbind_to (speccount, Qnil);
1234 b = XBUFFER (buf); /* Hypothetical relocating GC. */
1237 /* We have no more questions to ask. Verify that it is valid
1238 to kill the buffer. This must be done after the questions
1239 since anything can happen within yes-or-no-p. */
1241 /* Might have been deleted during the last question above */
1242 if (!BUFFER_LIVE_P (b))
1245 /* Don't kill the minibuffer now current. */
1246 if (EQ (buf, XWINDOW (minibuf_window)->buffer))
1249 /* When we kill a base buffer, kill all its indirect buffers.
1250 We do it at this stage so nothing terrible happens if they
1251 ask questions or their hooks get errors. */
1252 if (! b->base_buffer)
1258 LIST_LOOP (rest, b->indirect_children)
1260 Fkill_buffer (XCAR (rest));
1261 /* Keep indirect_children updated in case a
1262 query-function/hook throws. */
1263 b->indirect_children = XCDR (rest);
1269 /* Make this buffer not be current.
1270 In the process, notice if this is the sole visible buffer
1271 and give up if so. */
1272 if (b == current_buffer)
1274 Fset_buffer (Fother_buffer (buf, Qnil, Qnil));
1275 if (b == current_buffer)
1279 /* Now there is no question: we can kill the buffer. */
1281 #ifdef CLASH_DETECTION
1282 /* Unlock this buffer's file, if it is locked. unlock_buffer
1283 can both GC and kill the current buffer, and wreak general
1284 havok by running lisp code. */
1290 if (!BUFFER_LIVE_P (b))
1293 if (b == current_buffer)
1295 Fset_buffer (Fother_buffer (buf, Qnil, Qnil));
1296 if (b == current_buffer)
1299 #endif /* CLASH_DETECTION */
1302 int speccount = specpdl_depth ();
1303 specbind (Qinhibit_quit, Qt);
1305 kill_buffer_processes (buf);
1307 delete_from_buffer_alist (buf);
1309 /* #### This is a problem if this buffer is in a dedicated window.
1310 Need to undedicate any windows of this buffer first (and delete them?)
1312 Freplace_buffer_in_windows (buf);
1314 font_lock_buffer_was_killed (b);
1316 /* Delete any auto-save file, if we saved it in this session. */
1317 if (STRINGP (b->auto_save_file_name)
1318 && b->auto_save_modified != 0
1319 && BUF_SAVE_MODIFF (b) < b->auto_save_modified)
1321 if (delete_auto_save_files != 0)
1323 /* deleting the auto save file might kill b! */
1324 /* #### dmoore - fix this crap, we do this same gcpro and
1325 buffer liveness check multiple times. Let's get a
1326 macro or something for it. */
1328 internal_delete_file (b->auto_save_file_name);
1332 if (!BUFFER_LIVE_P (b))
1335 if (b == current_buffer)
1337 Fset_buffer (Fother_buffer (buf, Qnil, Qnil));
1338 if (b == current_buffer)
1344 uninit_buffer_markers (b);
1346 kill_buffer_local_variables (b);
1349 uninit_buffer_text (b);
1350 b->undo_list = Qnil;
1351 uninit_buffer_extents (b);
1354 #ifdef ERROR_CHECK_BUFPOS
1355 assert (!NILP (memq_no_quit (buf, b->base_buffer->indirect_children)));
1357 b->base_buffer->indirect_children =
1358 delq_no_quit (buf, b->base_buffer->indirect_children);
1361 /* Clear away all Lisp objects, so that they
1362 won't be protected from GC. */
1363 nuke_all_buffer_slots (b, Qnil);
1365 unbind_to (speccount, Qnil);
1370 DEFUN ("record-buffer", Frecord_buffer, 1, 1, 0, /*
1371 Place buffer BUFFER first in the buffer order.
1372 Call this function when a buffer is selected "visibly".
1374 This function changes the global buffer order and the per-frame buffer
1375 order for the selected frame. The buffer order keeps track of recency
1376 of selection so that `other-buffer' will return a recently selected
1377 buffer. See `other-buffer' for more information.
1381 REGISTER Lisp_Object lynk, prev;
1382 struct frame *f = selected_frame ();
1385 for (lynk = Vbuffer_alist; CONSP (lynk); lynk = XCDR (lynk))
1387 if (EQ (XCDR (XCAR (lynk)), buffer))
1391 /* Effectively do Vbuffer_alist = delq_no_quit (lynk, Vbuffer_alist) */
1393 Vbuffer_alist = XCDR (Vbuffer_alist);
1395 XCDR (prev) = XCDR (XCDR (prev));
1396 XCDR (lynk) = Vbuffer_alist;
1397 Vbuffer_alist = lynk;
1399 /* That was the global one. Now do the same thing for the
1400 per-frame buffer-alist. */
1402 for (lynk = f->buffer_alist; CONSP (lynk); lynk = XCDR (lynk))
1404 if (EQ (XCDR (XCAR (lynk)), buffer))
1408 /* Effectively do f->buffer_alist = delq_no_quit (lynk, f->buffer_alist) */
1410 f->buffer_alist = XCDR (f->buffer_alist);
1412 XCDR (prev) = XCDR (XCDR (prev));
1413 XCDR (lynk) = f->buffer_alist;
1414 f->buffer_alist = lynk;
1419 DEFUN ("set-buffer-major-mode", Fset_buffer_major_mode, 1, 1, 0, /*
1420 Set an appropriate major mode for BUFFER, according to `default-major-mode'.
1421 Use this function before selecting the buffer, since it may need to inspect
1422 the current buffer's major mode.
1426 int speccount = specpdl_depth ();
1427 Lisp_Object function = XBUFFER (Vbuffer_defaults)->major_mode;
1429 if (NILP (function))
1431 Lisp_Object tem = Fget (current_buffer->major_mode, Qmode_class, Qnil);
1433 function = current_buffer->major_mode;
1436 if (NILP (function) || EQ (function, Qfundamental_mode))
1439 /* To select a nonfundamental mode,
1440 select the buffer temporarily and then call the mode function. */
1442 record_unwind_protect (Fset_buffer, Fcurrent_buffer ());
1444 Fset_buffer (buffer);
1447 return unbind_to (speccount, Qnil);
1451 switch_to_buffer (Lisp_Object bufname, Lisp_Object norecord)
1453 call2 (Qswitch_to_buffer, bufname, norecord);
1457 DEFUN ("current-buffer", Fcurrent_buffer, 0, 0, 0, /*
1458 Return the current buffer as a Lisp object.
1463 XSETBUFFER (buffer, current_buffer);
1467 /* Set the current buffer to B. */
1470 set_buffer_internal (struct buffer *b)
1472 REGISTER struct buffer *old_buf;
1473 REGISTER Lisp_Object tail;
1475 if (current_buffer == b)
1478 INVALIDATE_PIXEL_TO_GLYPH_CACHE;
1480 old_buf = current_buffer;
1482 invalidate_current_column (); /* invalidate indentation cache */
1485 if (!noninteractive && initialized)
1487 extern Lisp_Object Ffep_force_on (), Ffep_force_off (), Ffep_get_mode ();
1489 old_buf->fep_mode = Ffep_get_mode ();
1491 if (!NILP (current_buffer->fep_mode))
1496 #endif /* HAVE_FEP */
1500 /* Put the undo list back in the base buffer, so that it appears
1501 that an indirect buffer shares the undo list of its base. */
1502 if (old_buf->base_buffer)
1503 old_buf->base_buffer->undo_list = old_buf->undo_list;
1506 /* Get the undo list from the base buffer, so that it appears
1507 that an indirect buffer shares the undo list of its base. */
1509 b->undo_list = b->base_buffer->undo_list;
1511 /* Look down buffer's list of local Lisp variables
1512 to find and update any that forward into C variables. */
1514 LIST_LOOP (tail, b->local_var_alist)
1516 Lisp_Object sym = XCAR (XCAR (tail));
1517 Lisp_Object valcontents = XSYMBOL (sym)->value;
1518 if (SYMBOL_VALUE_MAGIC_P (valcontents))
1520 /* Just reference the variable
1521 to cause it to become set for this buffer. */
1522 /* Use find_symbol_value_quickly to avoid an unnecessary O(n)
1524 (void) find_symbol_value_quickly (XCAR (tail), 1);
1528 /* Do the same with any others that were local to the previous buffer */
1532 LIST_LOOP (tail, old_buf->local_var_alist)
1534 Lisp_Object sym = XCAR (XCAR (tail));
1535 Lisp_Object valcontents = XSYMBOL (sym)->value;
1537 if (SYMBOL_VALUE_MAGIC_P (valcontents))
1539 /* Just reference the variable
1540 to cause it to become set for this buffer. */
1541 /* Use find_symbol_value_quickly with find_it_p as 0 to avoid an
1542 unnecessary O(n) lookup which is guaranteed to be worst case.
1543 Any symbols which are local are guaranteed to have been
1544 handled in the previous loop, above. */
1545 (void) find_symbol_value_quickly (sym, 0);
1551 DEFUN ("set-buffer", Fset_buffer, 1, 1, 0, /*
1552 Make the buffer BUFFER current for editing operations.
1553 BUFFER may be a buffer or the name of an existing buffer.
1554 See also `save-excursion' when you want to make a buffer current temporarily.
1555 This function does not display the buffer, so its effect ends
1556 when the current command terminates.
1557 Use `switch-to-buffer' or `pop-to-buffer' to switch buffers permanently.
1561 buffer = get_buffer (buffer, 0);
1563 error ("Selecting deleted or non-existent buffer");
1564 set_buffer_internal (XBUFFER (buffer));
1569 DEFUN ("barf-if-buffer-read-only", Fbarf_if_buffer_read_only, 0, 3, 0, /*
1570 Signal a `buffer-read-only' error if the buffer is read-only.
1571 Optional argument BUFFER defaults to the current buffer.
1573 If optional argument START is non-nil, all extents in the buffer
1574 which overlap that part of the buffer are checked to ensure none has a
1575 `read-only' property. (Extents that lie completely within the range,
1576 however, are not checked.) END defaults to the value of START.
1578 If START and END are equal, the range checked is [START, END] (i.e.
1579 closed on both ends); otherwise, the range checked is (START, END)
1580 \(open on both ends), except that extents that lie completely within
1581 [START, END] are not checked. See `extent-in-region-p' for a fuller
1584 (buffer, start, end))
1586 struct buffer *b = decode_buffer (buffer, 0);
1595 get_buffer_range_char (b, start, end, &s, &e, 0);
1597 barf_if_buffer_read_only (b, s, e);
1603 bury_buffer_1 (Lisp_Object buffer, Lisp_Object before,
1604 Lisp_Object *buffer_alist)
1606 Lisp_Object aelt = rassq_no_quit (buffer, *buffer_alist);
1607 Lisp_Object lynk = memq_no_quit (aelt, *buffer_alist);
1608 Lisp_Object iter, before_before;
1610 *buffer_alist = delq_no_quit (aelt, *buffer_alist);
1611 for (before_before = Qnil, iter = *buffer_alist;
1612 !NILP (iter) && !EQ (XCDR (XCAR (iter)), before);
1613 before_before = iter, iter = XCDR (iter))
1616 if (!NILP (before_before))
1617 XCDR (before_before) = lynk;
1619 *buffer_alist = lynk;
1622 DEFUN ("bury-buffer", Fbury_buffer, 0, 2, "", /*
1623 Put BUFFER at the end of the list of all buffers.
1624 There it is the least likely candidate for `other-buffer' to return;
1625 thus, the least likely buffer for \\[switch-to-buffer] to select by default.
1626 If BUFFER is nil or omitted, bury the current buffer.
1627 Also, if BUFFER is nil or omitted, remove the current buffer from the
1628 selected window if it is displayed there.
1629 Because of this, you may need to specify (current-buffer) as
1630 BUFFER when calling from minibuffer.
1631 If BEFORE is non-nil, it specifies a buffer before which BUFFER
1632 will be placed, instead of being placed at the end.
1636 /* This function can GC */
1637 struct buffer *buf = decode_buffer (buffer, 1);
1638 /* If we're burying the current buffer, unshow it. */
1639 /* Note that the behavior of (bury-buffer nil) and
1640 (bury-buffer (current-buffer)) is not the same.
1641 This is illogical but is historical. Changing it
1642 breaks mh-e and TeX and such packages. */
1644 switch_to_buffer (Fother_buffer (Fcurrent_buffer (), Qnil, Qnil), Qnil);
1645 XSETBUFFER (buffer, buf);
1648 before = get_buffer (before, 1);
1650 if (EQ (before, buffer))
1651 error ("Cannot place a buffer before itself");
1653 bury_buffer_1 (buffer, before, &Vbuffer_alist);
1654 bury_buffer_1 (buffer, before, &selected_frame ()->buffer_alist);
1660 DEFUN ("erase-buffer", Ferase_buffer, 0, 1, "*", /*
1661 Delete the entire contents of the BUFFER.
1662 Any clipping restriction in effect (see `narrow-to-region') is removed,
1663 so the buffer is truly empty after this.
1664 BUFFER defaults to the current buffer if omitted.
1668 /* This function can GC */
1669 struct buffer *b = decode_buffer (buffer, 1);
1670 /* #### yuck yuck yuck. This is gross. The old echo-area code,
1671 however, was the only place that called erase_buffer() with a
1672 non-zero NO_CLIP argument.
1674 Someone needs to fix up the redisplay code so it is smarter
1675 about this, so that the NO_CLIP junk isn't necessary. */
1676 int no_clip = (b == XBUFFER (Vecho_area_buffer));
1678 INVALIDATE_PIXEL_TO_GLYPH_CACHE;
1680 widen_buffer (b, no_clip);
1681 buffer_delete_range (b, BUF_BEG (b), BUF_Z (b), 0);
1682 b->last_window_start = 1;
1684 /* Prevent warnings, or suspension of auto saving, that would happen
1685 if future size is less than past size. Use of erase-buffer
1686 implies that the future text is not really related to the past text. */
1687 b->saved_size = Qzero;
1689 zmacs_region_stays = 0;
1695 DEFUN ("kill-all-local-variables", Fkill_all_local_variables, 0, 0, 0, /*
1696 Switch to Fundamental mode by killing current buffer's local variables.
1697 Most local variable bindings are eliminated so that the default values
1698 become effective once more. Also, the syntax table is set from
1699 `standard-syntax-table', the category table is set from
1700 `standard-category-table' (if support for Mule exists), local keymap is set
1701 to nil, the abbrev table is set from `fundamental-mode-abbrev-table',
1702 and all specifier specifications whose locale is the current buffer
1703 are removed. This function also forces redisplay of the modeline.
1705 Every function to select a new major mode starts by
1706 calling this function.
1708 As a special exception, local variables whose names have
1709 a non-nil `permanent-local' property are not eliminated by this function.
1711 The first thing this function does is run
1712 the normal hook `change-major-mode-hook'.
1716 /* This function can GC */
1717 run_hook (Qchange_major_mode_hook);
1719 reset_buffer_local_variables (current_buffer, 0);
1721 kill_buffer_local_variables (current_buffer);
1723 kill_specifier_buffer_locals (Fcurrent_buffer ());
1725 /* Force modeline redisplay. Useful here because all major mode
1726 commands call this function. */
1727 MARK_MODELINE_CHANGED;
1732 #ifdef MEMORY_USAGE_STATS
1743 compute_buffer_text_usage (struct buffer *b, struct overhead_stats *ovstats)
1745 int was_requested = b->text->z - 1;
1746 size_t gap = b->text->gap_size + b->text->end_gap_size;
1747 size_t malloc_use = malloced_storage_size (b->text->beg, was_requested + gap, 0);
1749 ovstats->gap_overhead += gap;
1750 ovstats->was_requested += was_requested;
1751 ovstats->malloc_overhead += malloc_use - (was_requested + gap);
1756 compute_buffer_usage (struct buffer *b, struct buffer_stats *stats,
1757 struct overhead_stats *ovstats)
1760 stats->other += malloced_storage_size (b, sizeof (*b), ovstats);
1761 stats->text += compute_buffer_text_usage (b, ovstats);
1762 stats->markers += compute_buffer_marker_usage (b, ovstats);
1763 stats->extents += compute_buffer_extent_usage (b, ovstats);
1766 DEFUN ("buffer-memory-usage", Fbuffer_memory_usage, 1, 1, 0, /*
1767 Return stats about the memory usage of buffer BUFFER.
1768 The values returned are in the form of an alist of usage types and byte
1769 counts. The byte counts attempt to encompass all the memory used
1770 by the buffer (separate from the memory logically associated with a
1771 buffer or frame), including internal structures and any malloc()
1772 overhead associated with them. In practice, the byte counts are
1773 underestimated because certain memory usage is very hard to determine
1774 \(e.g. the amount of memory used inside the Xt library or inside the
1775 X server) and because there is other stuff that might logically
1776 be associated with a window, buffer, or frame (e.g. window configurations,
1777 glyphs) but should not obviously be included in the usage counts.
1779 Multiple slices of the total memory usage may be returned, separated
1780 by a nil. Each slice represents a particular view of the memory, a
1781 particular way of partitioning it into groups. Within a slice, there
1782 is no overlap between the groups of memory, and each slice collectively
1783 represents all the memory concerned.
1787 struct buffer_stats stats;
1788 struct overhead_stats ovstats;
1789 Lisp_Object val = Qnil;
1791 CHECK_BUFFER (buffer); /* dead buffers should be allowed, no? */
1793 compute_buffer_usage (XBUFFER (buffer), &stats, &ovstats);
1795 val = acons (Qtext, make_int (stats.text), val);
1796 val = acons (Qmarkers, make_int (stats.markers), val);
1797 val = acons (Qextents, make_int (stats.extents), val);
1798 val = acons (Qother, make_int (stats.other), val);
1799 val = Fcons (Qnil, val);
1800 val = acons (Qactually_requested, make_int (ovstats.was_requested), val);
1801 val = acons (Qmalloc_overhead, make_int (ovstats.malloc_overhead), val);
1802 val = acons (Qgap_overhead, make_int (ovstats.gap_overhead), val);
1803 val = acons (Qdynarr_overhead, make_int (ovstats.dynarr_overhead), val);
1805 return Fnreverse (val);
1808 #endif /* MEMORY_USAGE_STATS */
1811 /************************************************************************/
1812 /* Implement TO_EXTERNAL_FORMAT, TO_INTERNAL_FORMAT */
1813 /************************************************************************/
1815 /* This implementation should probably be elsewhere, but it can't be
1816 in file-coding.c since that file is only available if FILE_CODING
1820 coding_system_is_binary (Lisp_Object coding_system)
1822 Lisp_Coding_System *cs = XCODING_SYSTEM (coding_system);
1824 (CODING_SYSTEM_TYPE (cs) == CODESYS_NO_CONVERSION &&
1825 CODING_SYSTEM_EOL_TYPE (cs) == EOL_LF &&
1826 EQ (CODING_SYSTEM_POST_READ_CONVERSION (cs), Qnil) &&
1827 EQ (CODING_SYSTEM_PRE_WRITE_CONVERSION (cs), Qnil));
1830 #define coding_system_is_binary(coding_system) 1
1835 Dynarr_declare (Bufbyte_dynarr *);
1836 } Bufbyte_dynarr_dynarr;
1840 Dynarr_declare (Extbyte_dynarr *);
1841 } Extbyte_dynarr_dynarr;
1843 static Extbyte_dynarr_dynarr *conversion_out_dynarr_list;
1844 static Bufbyte_dynarr_dynarr *conversion_in_dynarr_list;
1846 static int dfc_convert_to_external_format_in_use;
1847 static int dfc_convert_to_internal_format_in_use;
1850 dfc_convert_to_external_format_reset_in_use (Lisp_Object value)
1852 dfc_convert_to_external_format_in_use = XINT (value);
1857 dfc_convert_to_internal_format_reset_in_use (Lisp_Object value)
1859 dfc_convert_to_internal_format_in_use = XINT (value);
1864 dfc_convert_to_external_format (dfc_conversion_type source_type,
1865 dfc_conversion_data *source,
1867 Lisp_Object coding_system,
1869 dfc_conversion_type sink_type,
1870 dfc_conversion_data *sink)
1872 int count = specpdl_depth ();
1873 Extbyte_dynarr *conversion_out_dynarr;
1875 type_checking_assert
1876 (((source_type == DFC_TYPE_DATA) ||
1877 (source_type == DFC_TYPE_LISP_LSTREAM && LSTREAMP (source->lisp_object)) ||
1878 (source_type == DFC_TYPE_LISP_STRING && STRINGP (source->lisp_object)))
1880 ((sink_type == DFC_TYPE_DATA) ||
1881 (sink_type == DFC_TYPE_LISP_LSTREAM && LSTREAMP (source->lisp_object))));
1883 record_unwind_protect (dfc_convert_to_external_format_reset_in_use,
1884 make_int (dfc_convert_to_external_format_in_use));
1885 if (Dynarr_length (conversion_out_dynarr_list) <=
1886 dfc_convert_to_external_format_in_use)
1887 Dynarr_add (conversion_out_dynarr_list, Dynarr_new (Extbyte));
1888 conversion_out_dynarr = Dynarr_at (conversion_out_dynarr_list,
1889 dfc_convert_to_external_format_in_use);
1890 dfc_convert_to_external_format_in_use++;
1891 Dynarr_reset (conversion_out_dynarr);
1894 coding_system = Fget_coding_system (coding_system);
1897 /* Here we optimize in the case where the coding system does no
1898 conversion. However, we don't want to optimize in case the source
1899 or sink is an lstream, since writing to an lstream can cause a
1900 garbage collection, and this could be problematic if the source
1901 is a lisp string. */
1902 if (source_type != DFC_TYPE_LISP_LSTREAM &&
1903 sink_type != DFC_TYPE_LISP_LSTREAM &&
1904 coding_system_is_binary (coding_system))
1909 if (source_type == DFC_TYPE_LISP_STRING)
1911 ptr = XSTRING_DATA (source->lisp_object);
1912 len = XSTRING_LENGTH (source->lisp_object);
1916 ptr = (Bufbyte *) source->data.ptr;
1917 len = source->data.len;
1923 for (end = ptr + len; ptr < end;)
1926 (BYTE_ASCII_P (*ptr)) ? *ptr :
1927 (*ptr == LEADING_BYTE_CONTROL_1) ? (*(ptr+1) - 0x20) :
1928 (*ptr == LEADING_BYTE_LATIN_ISO8859_1) ? (*(ptr+1)) :
1931 Dynarr_add (conversion_out_dynarr, (Extbyte) c);
1934 bufpos_checking_assert (ptr == end);
1937 Dynarr_add_many (conversion_out_dynarr, ptr, len);
1943 Lisp_Object streams_to_delete[3];
1944 int delete_count = 0;
1945 Lisp_Object instream, outstream;
1946 Lstream *reader, *writer;
1947 struct gcpro gcpro1, gcpro2;
1949 if (source_type == DFC_TYPE_LISP_LSTREAM)
1950 instream = source->lisp_object;
1951 else if (source_type == DFC_TYPE_DATA)
1952 streams_to_delete[delete_count++] = instream =
1953 make_fixed_buffer_input_stream (source->data.ptr, source->data.len);
1956 type_checking_assert (source_type == DFC_TYPE_LISP_STRING);
1957 streams_to_delete[delete_count++] = instream =
1958 make_lisp_string_input_stream (source->lisp_object, 0, -1);
1961 if (sink_type == DFC_TYPE_LISP_LSTREAM)
1962 outstream = sink->lisp_object;
1965 type_checking_assert (sink_type == DFC_TYPE_DATA);
1966 streams_to_delete[delete_count++] = outstream =
1967 make_dynarr_output_stream
1968 ((unsigned_char_dynarr *) conversion_out_dynarr);
1972 streams_to_delete[delete_count++] = outstream =
1973 make_encoding_output_stream (XLSTREAM (outstream), coding_system);
1976 reader = XLSTREAM (instream);
1977 writer = XLSTREAM (outstream);
1978 /* decoding_stream will gc-protect outstream */
1979 GCPRO2 (instream, outstream);
1983 ssize_t size_in_bytes;
1984 char tempbuf[1024]; /* some random amount */
1986 size_in_bytes = Lstream_read (reader, tempbuf, sizeof (tempbuf));
1988 if (size_in_bytes == 0)
1990 else if (size_in_bytes < 0)
1991 error ("Error converting to external format");
1993 size_in_bytes = Lstream_write (writer, tempbuf, size_in_bytes);
1995 if (size_in_bytes <= 0)
1996 error ("Error converting to external format");
1999 /* Closing writer will close any stream at the other end of writer. */
2000 Lstream_close (writer);
2001 Lstream_close (reader);
2004 /* The idea is that this function will create no garbage. */
2005 while (delete_count)
2006 Lstream_delete (XLSTREAM (streams_to_delete [--delete_count]));
2009 unbind_to (count, Qnil);
2011 if (sink_type != DFC_TYPE_LISP_LSTREAM)
2013 sink->data.len = Dynarr_length (conversion_out_dynarr);
2014 Dynarr_add (conversion_out_dynarr, 0);
2015 sink->data.ptr = Dynarr_atp (conversion_out_dynarr, 0);
2020 dfc_convert_to_internal_format (dfc_conversion_type source_type,
2021 dfc_conversion_data *source,
2023 Lisp_Object coding_system,
2025 dfc_conversion_type sink_type,
2026 dfc_conversion_data *sink)
2028 int count = specpdl_depth ();
2029 Bufbyte_dynarr *conversion_in_dynarr;
2031 type_checking_assert
2032 ((source_type == DFC_TYPE_DATA ||
2033 source_type == DFC_TYPE_LISP_LSTREAM)
2035 (sink_type == DFC_TYPE_DATA ||
2036 sink_type == DFC_TYPE_LISP_LSTREAM));
2038 record_unwind_protect (dfc_convert_to_internal_format_reset_in_use,
2039 make_int (dfc_convert_to_internal_format_in_use));
2040 if (Dynarr_length (conversion_in_dynarr_list) <=
2041 dfc_convert_to_internal_format_in_use)
2042 Dynarr_add (conversion_in_dynarr_list, Dynarr_new (Bufbyte));
2043 conversion_in_dynarr = Dynarr_at (conversion_in_dynarr_list,
2044 dfc_convert_to_internal_format_in_use);
2045 dfc_convert_to_internal_format_in_use++;
2046 Dynarr_reset (conversion_in_dynarr);
2049 coding_system = Fget_coding_system (coding_system);
2052 if (source_type != DFC_TYPE_LISP_LSTREAM &&
2053 sink_type != DFC_TYPE_LISP_LSTREAM &&
2054 coding_system_is_binary (coding_system))
2057 const Bufbyte *ptr = (const Bufbyte *) source->data.ptr;
2058 Bytecount len = source->data.len;
2059 const Bufbyte *end = ptr + len;
2061 for (; ptr < end; ptr++)
2065 if (BYTE_ASCII_P (c))
2066 Dynarr_add (conversion_in_dynarr, c);
2067 else if (BYTE_C1_P (c))
2069 Dynarr_add (conversion_in_dynarr, LEADING_BYTE_CONTROL_1);
2070 Dynarr_add (conversion_in_dynarr, c + 0x20);
2074 Dynarr_add (conversion_in_dynarr, LEADING_BYTE_LATIN_ISO8859_1);
2075 Dynarr_add (conversion_in_dynarr, c);
2079 Dynarr_add_many (conversion_in_dynarr, source->data.ptr, source->data.len);
2084 Lisp_Object streams_to_delete[3];
2085 int delete_count = 0;
2086 Lisp_Object instream, outstream;
2087 Lstream *reader, *writer;
2088 struct gcpro gcpro1, gcpro2;
2090 if (source_type == DFC_TYPE_LISP_LSTREAM)
2091 instream = source->lisp_object;
2094 type_checking_assert (source_type == DFC_TYPE_DATA);
2095 streams_to_delete[delete_count++] = instream =
2096 make_fixed_buffer_input_stream (source->data.ptr, source->data.len);
2099 if (sink_type == DFC_TYPE_LISP_LSTREAM)
2100 outstream = sink->lisp_object;
2103 type_checking_assert (sink_type == DFC_TYPE_DATA);
2104 streams_to_delete[delete_count++] = outstream =
2105 make_dynarr_output_stream
2106 ((unsigned_char_dynarr *) conversion_in_dynarr);
2110 streams_to_delete[delete_count++] = outstream =
2111 make_decoding_output_stream (XLSTREAM (outstream), coding_system);
2114 reader = XLSTREAM (instream);
2115 writer = XLSTREAM (outstream);
2116 /* outstream will gc-protect its sink stream, if necessary */
2117 GCPRO2 (instream, outstream);
2121 ssize_t size_in_bytes;
2122 char tempbuf[1024]; /* some random amount */
2124 size_in_bytes = Lstream_read (reader, tempbuf, sizeof (tempbuf));
2126 if (size_in_bytes == 0)
2128 else if (size_in_bytes < 0)
2129 error ("Error converting to internal format");
2131 size_in_bytes = Lstream_write (writer, tempbuf, size_in_bytes);
2133 if (size_in_bytes <= 0)
2134 error ("Error converting to internal format");
2137 /* Closing writer will close any stream at the other end of writer. */
2138 Lstream_close (writer);
2139 Lstream_close (reader);
2142 /* The idea is that this function will create no garbage. */
2143 while (delete_count)
2144 Lstream_delete (XLSTREAM (streams_to_delete [--delete_count]));
2147 unbind_to (count, Qnil);
2149 if (sink_type != DFC_TYPE_LISP_LSTREAM)
2151 sink->data.len = Dynarr_length (conversion_in_dynarr);
2152 Dynarr_add (conversion_in_dynarr, 0); /* remember to zero-terminate! */
2153 sink->data.ptr = Dynarr_atp (conversion_in_dynarr, 0);
2159 syms_of_buffer (void)
2161 INIT_LRECORD_IMPLEMENTATION (buffer);
2163 defsymbol (&Qbuffer_live_p, "buffer-live-p");
2164 defsymbol (&Qbuffer_or_string_p, "buffer-or-string-p");
2165 defsymbol (&Qmode_class, "mode-class");
2166 defsymbol (&Qrename_auto_save_file, "rename-auto-save-file");
2167 defsymbol (&Qkill_buffer_hook, "kill-buffer-hook");
2168 defsymbol (&Qpermanent_local, "permanent-local");
2170 defsymbol (&Qfirst_change_hook, "first-change-hook");
2171 defsymbol (&Qbefore_change_functions, "before-change-functions");
2172 defsymbol (&Qafter_change_functions, "after-change-functions");
2174 /* #### Obsolete, for compatibility */
2175 defsymbol (&Qbefore_change_function, "before-change-function");
2176 defsymbol (&Qafter_change_function, "after-change-function");
2178 defsymbol (&Qdefault_directory, "default-directory");
2180 defsymbol (&Qget_file_buffer, "get-file-buffer");
2181 defsymbol (&Qchange_major_mode_hook, "change-major-mode-hook");
2183 defsymbol (&Qfundamental_mode, "fundamental-mode");
2185 defsymbol (&Qfind_file_compare_truenames, "find-file-compare-truenames");
2187 defsymbol (&Qswitch_to_buffer, "switch-to-buffer");
2190 DEFSUBR (Fbuffer_live_p);
2191 DEFSUBR (Fbuffer_list);
2192 DEFSUBR (Fdecode_buffer);
2193 DEFSUBR (Fget_buffer);
2194 DEFSUBR (Fget_file_buffer);
2195 DEFSUBR (Fget_buffer_create);
2196 DEFSUBR (Fmake_indirect_buffer);
2198 DEFSUBR (Fgenerate_new_buffer_name);
2199 DEFSUBR (Fbuffer_name);
2200 DEFSUBR (Fbuffer_file_name);
2201 DEFSUBR (Fbuffer_base_buffer);
2202 DEFSUBR (Fbuffer_indirect_children);
2203 DEFSUBR (Fbuffer_local_variables);
2204 DEFSUBR (Fbuffer_dedicated_frame);
2205 DEFSUBR (Fset_buffer_dedicated_frame);
2206 DEFSUBR (Fbuffer_modified_p);
2207 DEFSUBR (Fset_buffer_modified_p);
2208 DEFSUBR (Fbuffer_modified_tick);
2209 DEFSUBR (Frename_buffer);
2210 DEFSUBR (Fother_buffer);
2211 DEFSUBR (Fbuffer_disable_undo);
2212 DEFSUBR (Fbuffer_enable_undo);
2213 DEFSUBR (Fkill_buffer);
2214 DEFSUBR (Ferase_buffer);
2215 DEFSUBR (Frecord_buffer);
2216 DEFSUBR (Fset_buffer_major_mode);
2217 DEFSUBR (Fcurrent_buffer);
2218 DEFSUBR (Fset_buffer);
2219 DEFSUBR (Fbarf_if_buffer_read_only);
2220 DEFSUBR (Fbury_buffer);
2221 DEFSUBR (Fkill_all_local_variables);
2222 #ifdef MEMORY_USAGE_STATS
2223 DEFSUBR (Fbuffer_memory_usage);
2226 deferror (&Qprotected_field, "protected-field",
2227 "Attempt to modify a protected field", Qerror);
2231 reinit_vars_of_buffer (void)
2233 conversion_in_dynarr_list = Dynarr_new2 (Bufbyte_dynarr_dynarr,
2235 conversion_out_dynarr_list = Dynarr_new2 (Extbyte_dynarr_dynarr,
2238 staticpro_nodump (&Vbuffer_alist);
2239 Vbuffer_alist = Qnil;
2243 /* initialize the buffer routines */
2245 vars_of_buffer (void)
2247 /* This function can GC */
2248 reinit_vars_of_buffer ();
2250 staticpro (&QSFundamental);
2251 staticpro (&QSscratch);
2253 QSFundamental = build_string ("Fundamental");
2254 QSscratch = build_string (DEFER_GETTEXT ("*scratch*"));
2256 DEFVAR_LISP ("change-major-mode-hook", &Vchange_major_mode_hook /*
2257 List of hooks to be run before killing local variables in a buffer.
2258 This should be used by any mode that temporarily alters the contents or
2259 the read-only state of the buffer. See also `kill-all-local-variables'.
2261 Vchange_major_mode_hook = Qnil;
2263 DEFVAR_BOOL ("find-file-compare-truenames", &find_file_compare_truenames /*
2264 If this is true, then the find-file command will check the truenames
2265 of all visited files when deciding whether a given file is already in
2266 a buffer, instead of just the buffer-file-name. This means that if you
2267 attempt to visit another file which is a symbolic-link to a file which is
2268 already in a buffer, the existing buffer will be found instead of a newly-
2269 created one. This works if any component of the pathname (including a non-
2270 terminal component) is a symbolic link as well, but doesn't work with hard
2271 links (nothing does).
2273 See also the variable find-file-use-truenames.
2275 find_file_compare_truenames = 0;
2277 DEFVAR_BOOL ("find-file-use-truenames", &find_file_use_truenames /*
2278 If this is true, then a buffer's visited file-name will always be
2279 chased back to the real file; it will never be a symbolic link, and there
2280 will never be a symbolic link anywhere in its directory path.
2281 That is, the buffer-file-name and buffer-file-truename will be equal.
2282 This doesn't work with hard links.
2284 See also the variable find-file-compare-truenames.
2286 find_file_use_truenames = 0;
2288 DEFVAR_LISP ("before-change-functions", &Vbefore_change_functions /*
2289 List of functions to call before each text change.
2290 Two arguments are passed to each function: the positions of
2291 the beginning and end of the range of old text to be changed.
2292 \(For an insertion, the beginning and end are at the same place.)
2293 No information is given about the length of the text after the change.
2295 Buffer changes made while executing the `before-change-functions'
2296 don't call any before-change or after-change functions.
2298 Vbefore_change_functions = Qnil;
2300 /* FSF Emacs has the following additional doc at the end of
2301 before-change-functions and after-change-functions:
2303 That's because these variables are temporarily set to nil.
2304 As a result, a hook function cannot straightforwardly alter the value of
2305 these variables. See the Emacs Lisp manual for a way of
2306 accomplishing an equivalent result by using other variables.
2308 But this doesn't apply under XEmacs because things are
2311 DEFVAR_LISP ("after-change-functions", &Vafter_change_functions /*
2312 List of functions to call after each text change.
2313 Three arguments are passed to each function: the positions of
2314 the beginning and end of the range of changed text,
2315 and the length of the pre-change text replaced by that range.
2316 \(For an insertion, the pre-change length is zero;
2317 for a deletion, that length is the number of characters deleted,
2318 and the post-change beginning and end are at the same place.)
2320 Buffer changes made while executing `after-change-functions'
2321 don't call any before-change or after-change functions.
2323 Vafter_change_functions = Qnil;
2325 DEFVAR_LISP ("before-change-function", &Vbefore_change_function /*
2327 */ ); /* obsoleteness will be documented */
2328 Vbefore_change_function = Qnil;
2330 DEFVAR_LISP ("after-change-function", &Vafter_change_function /*
2332 */ ); /* obsoleteness will be documented */
2333 Vafter_change_function = Qnil;
2335 DEFVAR_LISP ("first-change-hook", &Vfirst_change_hook /*
2336 A list of functions to call before changing a buffer which is unmodified.
2337 The functions are run using the `run-hooks' function.
2339 Vfirst_change_hook = Qnil;
2342 xxDEFVAR_LISP ("transient-mark-mode", &Vtransient_mark_mode /*
2343 *Non-nil means deactivate the mark when the buffer contents change.
2345 Vtransient_mark_mode = Qnil;
2346 #endif /* FSFmacs */
2348 DEFVAR_INT ("undo-threshold", &undo_threshold /*
2349 Keep no more undo information once it exceeds this size.
2350 This threshold is applied when garbage collection happens.
2351 The size is counted as the number of bytes occupied,
2352 which includes both saved text and other data.
2354 undo_threshold = 20000;
2356 DEFVAR_INT ("undo-high-threshold", &undo_high_threshold /*
2357 Don't keep more than this much size of undo information.
2358 A command which pushes past this size is itself forgotten.
2359 This threshold is applied when garbage collection happens.
2360 The size is counted as the number of bytes occupied,
2361 which includes both saved text and other data.
2363 undo_high_threshold = 30000;
2365 DEFVAR_LISP ("inhibit-read-only", &Vinhibit_read_only /*
2366 *Non-nil means disregard read-only status of buffers or characters.
2367 If the value is t, disregard `buffer-read-only' and all `read-only'
2368 text properties. If the value is a list, disregard `buffer-read-only'
2369 and disregard a `read-only' extent property or text property if the
2370 property value is a member of the list.
2372 Vinhibit_read_only = Qnil;
2374 DEFVAR_LISP ("kill-buffer-query-functions", &Vkill_buffer_query_functions /*
2375 List of functions called with no args to query before killing a buffer.
2377 Vkill_buffer_query_functions = Qnil;
2379 DEFVAR_BOOL ("delete-auto-save-files", &delete_auto_save_files /*
2380 *Non-nil means delete auto-save file when a buffer is saved or killed.
2382 delete_auto_save_files = 1;
2385 /* The docstrings for DEFVAR_* are recorded externally by make-docfile. */
2387 /* Renamed from DEFVAR_PER_BUFFER because FSFmacs D_P_B takes
2388 a bogus extra arg, which confuses an otherwise identical make-docfile.c */
2389 #define DEFVAR_BUFFER_LOCAL_1(lname, field_name, forward_type, magicfun) do { \
2390 static const struct symbol_value_forward I_hate_C = \
2391 { /* struct symbol_value_forward */ \
2392 { /* struct symbol_value_magic */ \
2393 { /* struct lcrecord_header */ \
2394 { /* struct lrecord_header */ \
2395 lrecord_type_symbol_value_forward, /* lrecord_type_index */ \
2397 1, /* c_readonly bit */ \
2398 1 /* lisp_readonly bit */ \
2404 &(buffer_local_flags.field_name), \
2411 int offset = ((char *)symbol_value_forward_forward (&I_hate_C) - \
2412 (char *)&buffer_local_flags); \
2413 defvar_magic (lname, &I_hate_C); \
2415 *((Lisp_Object *)(offset + (char *)XBUFFER (Vbuffer_local_symbols))) \
2420 #define DEFVAR_BUFFER_LOCAL_MAGIC(lname, field_name, magicfun) \
2421 DEFVAR_BUFFER_LOCAL_1 (lname, field_name, \
2422 SYMVAL_CURRENT_BUFFER_FORWARD, magicfun)
2423 #define DEFVAR_BUFFER_LOCAL(lname, field_name) \
2424 DEFVAR_BUFFER_LOCAL_MAGIC (lname, field_name, 0)
2425 #define DEFVAR_CONST_BUFFER_LOCAL_MAGIC(lname, field_name, magicfun) \
2426 DEFVAR_BUFFER_LOCAL_1 (lname, field_name, \
2427 SYMVAL_CONST_CURRENT_BUFFER_FORWARD, magicfun)
2428 #define DEFVAR_CONST_BUFFER_LOCAL(lname, field_name) \
2429 DEFVAR_CONST_BUFFER_LOCAL_MAGIC (lname, field_name, 0)
2431 #define DEFVAR_BUFFER_DEFAULTS_MAGIC(lname, field_name, magicfun) \
2432 DEFVAR_SYMVAL_FWD (lname, &(buffer_local_flags.field_name), \
2433 SYMVAL_DEFAULT_BUFFER_FORWARD, magicfun)
2434 #define DEFVAR_BUFFER_DEFAULTS(lname, field_name) \
2435 DEFVAR_BUFFER_DEFAULTS_MAGIC (lname, field_name, 0)
2438 nuke_all_buffer_slots (struct buffer *b, Lisp_Object zap)
2442 b->extent_info = Qnil;
2443 b->indirect_children = Qnil;
2444 b->own_text.line_number_cache = Qnil;
2446 #define MARKED_SLOT(x) b->x = zap
2447 #include "bufslots.h"
2452 common_init_complex_vars_of_buffer (void)
2454 /* Make sure all markable slots in buffer_defaults
2455 are initialized reasonably, so mark_buffer won't choke. */
2456 struct buffer *defs = alloc_lcrecord_type (struct buffer, &lrecord_buffer);
2457 struct buffer *syms = alloc_lcrecord_type (struct buffer, &lrecord_buffer);
2459 staticpro_nodump (&Vbuffer_defaults);
2460 staticpro_nodump (&Vbuffer_local_symbols);
2461 XSETBUFFER (Vbuffer_defaults, defs);
2462 XSETBUFFER (Vbuffer_local_symbols, syms);
2464 nuke_all_buffer_slots (syms, Qnil);
2465 nuke_all_buffer_slots (defs, Qnil);
2466 defs->text = &defs->own_text;
2467 syms->text = &syms->own_text;
2469 /* Set up the non-nil default values of various buffer slots.
2470 Must do these before making the first buffer. */
2471 defs->major_mode = Qfundamental_mode;
2472 defs->mode_name = QSFundamental;
2473 defs->abbrev_table = Qnil; /* real default setup by Lisp code */
2475 defs->downcase_table = Vascii_downcase_table;
2476 defs->upcase_table = Vascii_upcase_table;
2477 defs->case_canon_table = Vascii_canon_table;
2478 defs->case_eqv_table = Vascii_eqv_table;
2480 defs->mirror_downcase_table = Vmirror_ascii_downcase_table;
2481 defs->mirror_upcase_table = Vmirror_ascii_upcase_table;
2482 defs->mirror_case_canon_table = Vmirror_ascii_canon_table;
2483 defs->mirror_case_eqv_table = Vmirror_ascii_eqv_table;
2485 defs->category_table = Vstandard_category_table;
2487 defs->syntax_table = Vstandard_syntax_table;
2488 defs->mirror_syntax_table =
2489 XCHAR_TABLE (Vstandard_syntax_table)->mirror_table;
2490 defs->modeline_format = build_string ("%-"); /* reset in loaddefs.el */
2491 defs->case_fold_search = Qt;
2492 defs->selective_display_ellipses = Qt;
2493 defs->tab_width = make_int (8);
2494 defs->ctl_arrow = Qt;
2495 defs->fill_column = make_int (70);
2496 defs->left_margin = Qzero;
2497 defs->saved_size = Qzero; /* lisp code wants int-or-nil */
2499 defs->auto_save_modified = 0;
2500 defs->auto_save_failure_time = -1;
2501 defs->invisibility_spec = Qt;
2503 defs->indirect_children = Qnil;
2504 syms->indirect_children = Qnil;
2507 /* 0 means var is always local. Default used only at creation.
2508 * -1 means var is always local. Default used only at reset and
2510 * -2 means there's no lisp variable corresponding to this slot
2511 * and the default is only used at creation.
2512 * -3 means no Lisp variable. Default used only at reset and creation.
2513 * >0 is mask. Var is local if ((buffer->local_var_flags & mask) != 0)
2514 * Otherwise default is used.
2516 Lisp_Object always_local_no_default = make_int (0);
2517 Lisp_Object always_local_resettable = make_int (-1);
2518 Lisp_Object resettable = make_int (-3);
2520 /* Assign the local-flags to the slots that have default values.
2521 The local flag is a bit that is used in the buffer
2522 to say that it has its own local value for the slot.
2523 The local flag bits are in the local_var_flags slot of the
2526 nuke_all_buffer_slots (&buffer_local_flags, make_int (-2));
2527 buffer_local_flags.filename = always_local_no_default;
2528 buffer_local_flags.directory = always_local_no_default;
2529 buffer_local_flags.backed_up = always_local_no_default;
2530 buffer_local_flags.saved_size = always_local_no_default;
2531 buffer_local_flags.auto_save_file_name = always_local_no_default;
2532 buffer_local_flags.read_only = always_local_no_default;
2534 buffer_local_flags.major_mode = always_local_resettable;
2535 buffer_local_flags.mode_name = always_local_resettable;
2536 buffer_local_flags.undo_list = always_local_no_default;
2538 buffer_local_flags.mark_active = always_local_resettable;
2540 buffer_local_flags.point_before_scroll = always_local_resettable;
2541 buffer_local_flags.file_truename = always_local_no_default;
2542 buffer_local_flags.invisibility_spec = always_local_resettable;
2543 buffer_local_flags.file_format = always_local_resettable;
2544 buffer_local_flags.generated_modeline_string = always_local_no_default;
2546 buffer_local_flags.keymap = resettable;
2547 buffer_local_flags.downcase_table = resettable;
2548 buffer_local_flags.upcase_table = resettable;
2549 buffer_local_flags.case_canon_table = resettable;
2550 buffer_local_flags.case_eqv_table = resettable;
2551 buffer_local_flags.syntax_table = resettable;
2553 buffer_local_flags.category_table = resettable;
2556 buffer_local_flags.modeline_format = make_int (1<<0);
2557 buffer_local_flags.abbrev_mode = make_int (1<<1);
2558 buffer_local_flags.overwrite_mode = make_int (1<<2);
2559 buffer_local_flags.case_fold_search = make_int (1<<3);
2560 buffer_local_flags.auto_fill_function = make_int (1<<4);
2561 buffer_local_flags.selective_display = make_int (1<<5);
2562 buffer_local_flags.selective_display_ellipses = make_int (1<<6);
2563 buffer_local_flags.tab_width = make_int (1<<7);
2564 buffer_local_flags.truncate_lines = make_int (1<<8);
2565 buffer_local_flags.ctl_arrow = make_int (1<<9);
2566 buffer_local_flags.fill_column = make_int (1<<10);
2567 buffer_local_flags.left_margin = make_int (1<<11);
2568 buffer_local_flags.abbrev_table = make_int (1<<12);
2569 #ifdef REGION_CACHE_NEEDS_WORK
2570 buffer_local_flags.cache_long_line_scans = make_int (1<<13);
2573 buffer_local_flags.buffer_file_coding_system = make_int (1<<14);
2576 /* #### Warning: 1<<31 is the largest number currently allowable
2577 due to the XINT() handling of this value. With some
2578 rearrangement you can get 3 more bits. */
2582 #define BUFFER_SLOTS_SIZE (offsetof (struct buffer, BUFFER_SLOTS_LAST_NAME) - offsetof (struct buffer, BUFFER_SLOTS_FIRST_NAME) + sizeof (Lisp_Object))
2583 #define BUFFER_SLOTS_COUNT (BUFFER_SLOTS_SIZE / sizeof (Lisp_Object))
2586 reinit_complex_vars_of_buffer (void)
2588 struct buffer *defs, *syms;
2590 common_init_complex_vars_of_buffer ();
2592 defs = XBUFFER (Vbuffer_defaults);
2593 syms = XBUFFER (Vbuffer_local_symbols);
2594 memcpy (&defs->BUFFER_SLOTS_FIRST_NAME,
2595 buffer_defaults_saved_slots,
2597 memcpy (&syms->BUFFER_SLOTS_FIRST_NAME,
2598 buffer_local_symbols_saved_slots,
2603 static const struct lrecord_description buffer_slots_description_1[] = {
2604 { XD_LISP_OBJECT_ARRAY, 0, BUFFER_SLOTS_COUNT },
2608 static const struct struct_description buffer_slots_description = {
2610 buffer_slots_description_1
2614 complex_vars_of_buffer (void)
2616 struct buffer *defs, *syms;
2618 common_init_complex_vars_of_buffer ();
2620 defs = XBUFFER (Vbuffer_defaults);
2621 syms = XBUFFER (Vbuffer_local_symbols);
2622 buffer_defaults_saved_slots = &defs->BUFFER_SLOTS_FIRST_NAME;
2623 buffer_local_symbols_saved_slots = &syms->BUFFER_SLOTS_FIRST_NAME;
2624 dumpstruct (&buffer_defaults_saved_slots, &buffer_slots_description);
2625 dumpstruct (&buffer_local_symbols_saved_slots, &buffer_slots_description);
2627 DEFVAR_BUFFER_DEFAULTS ("default-modeline-format", modeline_format /*
2628 Default value of `modeline-format' for buffers that don't override it.
2629 This is the same as (default-value 'modeline-format).
2632 DEFVAR_BUFFER_DEFAULTS ("default-abbrev-mode", abbrev_mode /*
2633 Default value of `abbrev-mode' for buffers that do not override it.
2634 This is the same as (default-value 'abbrev-mode).
2637 DEFVAR_BUFFER_DEFAULTS ("default-ctl-arrow", ctl_arrow /*
2638 Default value of `ctl-arrow' for buffers that do not override it.
2639 This is the same as (default-value 'ctl-arrow).
2642 #if 0 /* #### make this a specifier! */
2643 DEFVAR_BUFFER_DEFAULTS ("default-display-direction", display_direction /*
2644 Default display-direction for buffers that do not override it.
2645 This is the same as (default-value 'display-direction).
2646 Note: This is not yet implemented.
2650 DEFVAR_BUFFER_DEFAULTS ("default-truncate-lines", truncate_lines /*
2651 Default value of `truncate-lines' for buffers that do not override it.
2652 This is the same as (default-value 'truncate-lines).
2655 DEFVAR_BUFFER_DEFAULTS ("default-fill-column", fill_column /*
2656 Default value of `fill-column' for buffers that do not override it.
2657 This is the same as (default-value 'fill-column).
2660 DEFVAR_BUFFER_DEFAULTS ("default-left-margin", left_margin /*
2661 Default value of `left-margin' for buffers that do not override it.
2662 This is the same as (default-value 'left-margin).
2665 DEFVAR_BUFFER_DEFAULTS ("default-tab-width", tab_width /*
2666 Default value of `tab-width' for buffers that do not override it.
2667 This is the same as (default-value 'tab-width).
2670 DEFVAR_BUFFER_DEFAULTS ("default-case-fold-search", case_fold_search /*
2671 Default value of `case-fold-search' for buffers that don't override it.
2672 This is the same as (default-value 'case-fold-search).
2675 DEFVAR_BUFFER_LOCAL ("modeline-format", modeline_format /*
2676 Template for displaying modeline for current buffer.
2677 Each buffer has its own value of this variable.
2678 Value may be a string, symbol, glyph, generic specifier, list or cons cell.
2679 For a symbol, its value is processed (but it is ignored if t or nil).
2680 A string appearing directly as the value of a symbol is processed verbatim
2681 in that the %-constructs below are not recognized.
2682 For a glyph, it is inserted as is.
2683 For a generic specifier (i.e. a specifier of type `generic'), its instance
2684 is computed in the current window using the equivalent of `specifier-instance'
2685 and the value is processed.
2686 For a list whose car is a symbol, the symbol's value is taken,
2687 and if that is non-nil, the cadr of the list is processed recursively.
2688 Otherwise, the caddr of the list (if there is one) is processed.
2689 For a list whose car is a string or list, each element is processed
2690 recursively and the results are effectively concatenated.
2691 For a list whose car is an integer, the cdr of the list is processed
2692 and padded (if the number is positive) or truncated (if negative)
2693 to the width specified by that number.
2694 For a list whose car is an extent, the cdr of the list is processed
2695 normally but the results are displayed using the face of the
2696 extent, and mouse clicks over this section are processed using the
2697 keymap of the extent. (In addition, if the extent has a help-echo
2698 property, that string will be echoed when the mouse moves over this
2699 section.) If extents are nested, all keymaps are properly consulted
2700 when processing mouse clicks, but multiple faces are not correctly
2701 merged (only the first face is used), and lists of faces are not
2702 correctly handled. See `generated-modeline-string' for more information.
2703 A string is printed verbatim in the modeline except for %-constructs:
2704 (%-constructs are processed when the string is the entire modeline-format
2705 or when it is found in a cons-cell or a list)
2706 %b -- print buffer name. %c -- print the current column number.
2707 %f -- print visited file name.
2708 %* -- print %, * or hyphen. %+ -- print *, % or hyphen.
2709 % means buffer is read-only and * means it is modified.
2710 For a modified read-only buffer, %* gives % and %+ gives *.
2711 %s -- print process status. %l -- print the current line number.
2712 %S -- print name of selected frame (only meaningful under X Windows).
2713 %p -- print percent of buffer above top of window, or Top, Bot or All.
2714 %P -- print percent of buffer above bottom of window, perhaps plus Top,
2715 or print Bottom or All.
2716 %n -- print Narrow if appropriate.
2717 %C -- under XEmacs/mule, print the mnemonic for `buffer-file-coding-system'.
2718 %[ -- print one [ for each recursive editing level. %] similar.
2719 %% -- print %. %- -- print infinitely many dashes.
2720 Decimal digits after the % specify field width to which to pad.
2723 DEFVAR_BUFFER_DEFAULTS ("default-major-mode", major_mode /*
2724 *Major mode for new buffers. Defaults to `fundamental-mode'.
2725 nil here means use current buffer's major mode.
2728 DEFVAR_BUFFER_DEFAULTS ("fundamental-mode-abbrev-table", abbrev_table /*
2729 The abbrev table of mode-specific abbrevs for Fundamental Mode.
2732 DEFVAR_BUFFER_LOCAL ("major-mode", major_mode /*
2733 Symbol for current buffer's major mode.
2736 DEFVAR_BUFFER_LOCAL ("mode-name", mode_name /*
2737 Pretty name of current buffer's major mode (a string).
2740 DEFVAR_BUFFER_LOCAL ("abbrev-mode", abbrev_mode /*
2741 Non-nil turns on automatic expansion of abbrevs as they are inserted.
2742 Automatically becomes buffer-local when set in any fashion.
2745 DEFVAR_BUFFER_LOCAL ("case-fold-search", case_fold_search /*
2746 *Non-nil if searches should ignore case.
2747 Automatically becomes buffer-local when set in any fashion.
2749 BUG: Under XEmacs/Mule, translations to or from non-ASCII characters
2750 (this includes chars in the range 128 - 255) are ignored by
2751 the string/buffer-searching routines. Thus, `case-fold-search'
2752 will not correctly conflate a-umlaut and A-umlaut even if the
2753 case tables call for this.
2756 DEFVAR_BUFFER_LOCAL ("fill-column", fill_column /*
2757 *Column beyond which automatic line-wrapping should happen.
2758 Automatically becomes buffer-local when set in any fashion.
2761 DEFVAR_BUFFER_LOCAL ("left-margin", left_margin /*
2762 *Column for the default indent-line-function to indent to.
2763 Linefeed indents to this column in Fundamental mode.
2764 Automatically becomes buffer-local when set in any fashion.
2765 Do not confuse this with the specifier `left-margin-width';
2766 that controls the size of a margin that is displayed outside
2770 DEFVAR_BUFFER_LOCAL_MAGIC ("tab-width", tab_width /*
2771 *Distance between tab stops (for display of tab characters), in columns.
2772 Automatically becomes buffer-local when set in any fashion.
2773 */ , redisplay_variable_changed);
2775 DEFVAR_BUFFER_LOCAL_MAGIC ("ctl-arrow", ctl_arrow /*
2776 *Non-nil means display control chars with uparrow.
2777 Nil means use backslash and octal digits.
2778 An integer means characters >= ctl-arrow are assumed to be printable, and
2779 will be displayed as a single glyph.
2780 Any other value is the same as 160 - the code SPC with the high bit on.
2782 The interpretation of this variable is likely to change in the future.
2784 Automatically becomes buffer-local when set in any fashion.
2785 This variable does not apply to characters whose display is specified
2786 in the current display table (if there is one).
2787 */ , redisplay_variable_changed);
2789 #if 0 /* #### Make this a specifier! */
2790 xxDEFVAR_BUFFER_LOCAL ("display-direction", display_direction /*
2791 *Non-nil means lines in the buffer are displayed right to left.
2792 Nil means left to right. (Not yet implemented.)
2794 #endif /* Not yet implemented */
2796 DEFVAR_BUFFER_LOCAL_MAGIC ("truncate-lines", truncate_lines /*
2797 *Non-nil means do not display continuation lines;
2798 give each line of text one frame line.
2799 Automatically becomes buffer-local when set in any fashion.
2801 Note that this is overridden by the variable
2802 `truncate-partial-width-windows' if that variable is non-nil
2803 and this buffer is not full-frame width.
2804 */ , redisplay_variable_changed);
2806 DEFVAR_BUFFER_LOCAL ("default-directory", directory /*
2807 Name of default directory of current buffer. Should end with slash.
2808 Each buffer has its own value of this variable.
2812 DEFVAR_BUFFER_DEFAULTS ("default-buffer-file-coding-system", buffer_file_coding_system /*
2813 Default value of `buffer-file-coding-system' for buffers that do not override it.
2814 This is the same as (default-value 'buffer-file-coding-system).
2815 This value is used both for buffers without associated files and
2816 for buffers whose files do not have any apparent coding system.
2817 See `buffer-file-coding-system'.
2820 DEFVAR_BUFFER_LOCAL ("buffer-file-coding-system", buffer_file_coding_system /*
2821 *Current coding system for the current buffer.
2822 When the buffer is written out into a file, this coding system will be
2823 used for the encoding. Automatically buffer-local when set in any
2824 fashion. This is normally set automatically when a file is loaded in
2825 based on the determined coding system of the file (assuming that
2826 `buffer-file-coding-system-for-read' is set to `undecided', which
2827 calls for automatic determination of the file's coding system).
2828 Normally the modeline indicates the current file coding system using
2829 its mnemonic abbreviation.
2831 The default value for this variable (which is normally used for
2832 buffers without associated files) is also used when automatic
2833 detection of a file's encoding is called for and there was no
2834 discernible encoding in the file (i.e. it was entirely or almost
2835 entirely ASCII). The default value should generally *not* be set to
2836 nil (equivalent to `no-conversion'), because if extended characters
2837 are ever inserted into the buffer, they will be lost when the file is
2838 written out. A good choice is `iso-2022-8' (the simple ISO 2022 8-bit
2839 encoding), which will write out ASCII and Latin-1 characters in the
2840 standard (and highly portable) fashion and use standard escape
2841 sequences for other charsets. Another reasonable choice is
2842 `escape-quoted', which is equivalent to `iso-2022-8' but prefixes
2843 certain control characters with ESC to make sure they are not
2844 interpreted as escape sequences when read in. This latter coding
2845 system results in more "correct" output in the presence of control
2846 characters in the buffer, in the sense that when read in again using
2847 the same coding system, the result will virtually always match the
2848 original contents of the buffer, which is not the case with
2849 `iso-2022-8'; but the output is less portable when dealing with binary
2850 data -- there may be stray ESC characters when the file is read by
2853 `buffer-file-coding-system' does *not* control the coding system used when
2854 a file is read in. Use the variables `buffer-file-coding-system-for-read'
2855 and `buffer-file-coding-system-alist' for that. From a Lisp program, if
2856 you wish to unilaterally specify the coding system used for one
2857 particular operation, you should bind the variable
2858 `coding-system-for-read' rather than changing the other two
2859 variables just mentioned, which are intended to be used for
2860 global environment specification.
2862 #endif /* FILE_CODING */
2864 DEFVAR_BUFFER_LOCAL ("auto-fill-function", auto_fill_function /*
2865 Function called (if non-nil) to perform auto-fill.
2866 It is called after self-inserting a space at a column beyond `fill-column'.
2867 Each buffer has its own value of this variable.
2868 NOTE: This variable is not an ordinary hook;
2869 It may not be a list of functions.
2872 DEFVAR_BUFFER_LOCAL ("buffer-file-name", filename /*
2873 Name of file visited in current buffer, or nil if not visiting a file.
2874 Each buffer has its own value of this variable.
2879 Abbreviated truename of file visited in current buffer, or nil if none.
2880 The truename of a file is calculated by `file-truename'
2881 and then abbreviated with `abbreviate-file-name'.
2882 Each buffer has its own value of this variable.
2884 #endif /* FSFmacs */
2886 DEFVAR_BUFFER_LOCAL ("buffer-file-truename", file_truename /*
2887 The real name of the file visited in the current buffer,
2888 or nil if not visiting a file. This is the result of passing
2889 buffer-file-name to the `file-truename' function. Every buffer has
2890 its own value of this variable. This variable is automatically
2891 maintained by the functions that change the file name associated
2895 DEFVAR_BUFFER_LOCAL ("buffer-auto-save-file-name", auto_save_file_name /*
2896 Name of file for auto-saving current buffer,
2897 or nil if buffer should not be auto-saved.
2898 Each buffer has its own value of this variable.
2901 DEFVAR_BUFFER_LOCAL ("buffer-read-only", read_only /*
2902 Non-nil if this buffer is read-only.
2903 Each buffer has its own value of this variable.
2906 DEFVAR_BUFFER_LOCAL ("buffer-backed-up", backed_up /*
2907 Non-nil if this buffer's file has been backed up.
2908 Backing up is done before the first time the file is saved.
2909 Each buffer has its own value of this variable.
2912 DEFVAR_BUFFER_LOCAL ("buffer-saved-size", saved_size /*
2913 Length of current buffer when last read in, saved or auto-saved.
2915 Each buffer has its own value of this variable.
2918 DEFVAR_BUFFER_LOCAL_MAGIC ("selective-display", selective_display /*
2919 Non-nil enables selective display:
2920 Integer N as value means display only lines
2921 that start with less than n columns of space.
2922 A value of t means, after a ^M, all the rest of the line is invisible.
2923 Then ^M's in the file are written into files as newlines.
2925 Automatically becomes buffer-local when set in any fashion.
2926 */, redisplay_variable_changed);
2929 DEFVAR_BUFFER_LOCAL_MAGIC ("selective-display-ellipses",
2930 selective_display_ellipses /*
2931 t means display ... on previous line when a line is invisible.
2932 Automatically becomes buffer-local when set in any fashion.
2933 */, redisplay_variable_changed);
2936 DEFVAR_BUFFER_LOCAL ("local-abbrev-table", abbrev_table /*
2937 Local (mode-specific) abbrev table of current buffer.
2940 DEFVAR_BUFFER_LOCAL ("overwrite-mode", overwrite_mode /*
2941 Non-nil if self-insertion should replace existing text.
2942 The value should be one of `overwrite-mode-textual',
2943 `overwrite-mode-binary', or nil.
2944 If it is `overwrite-mode-textual', self-insertion still
2945 inserts at the end of a line, and inserts when point is before a tab,
2946 until the tab is filled in.
2947 If `overwrite-mode-binary', self-insertion replaces newlines and tabs too.
2948 Automatically becomes buffer-local when set in any fashion.
2950 Normally, you shouldn't modify this variable by hand, but use the functions
2951 `overwrite-mode' and `binary-overwrite-mode' instead. However, you can
2952 customize the default value from the options menu.
2956 /* Adds the following to the doc string for buffer-undo-list:
2958 An entry (nil PROPERTY VALUE BEG . END) indicates that a text property
2959 was modified between BEG and END. PROPERTY is the property name,
2960 and VALUE is the old value.
2962 #endif /* FSFmacs */
2964 DEFVAR_BUFFER_LOCAL ("buffer-undo-list", undo_list /*
2965 List of undo entries in current buffer.
2966 Recent changes come first; older changes follow newer.
2968 An entry (BEG . END) represents an insertion which begins at
2969 position BEG and ends at position END.
2971 An entry (TEXT . POSITION) represents the deletion of the string TEXT
2972 from (abs POSITION). If POSITION is positive, point was at the front
2973 of the text being deleted; if negative, point was at the end.
2975 An entry (t HIGH . LOW) indicates that the buffer previously had
2976 "unmodified" status. HIGH and LOW are the high and low 16-bit portions
2977 of the visited file's modification time, as of that time. If the
2978 modification time of the most recent save is different, this entry is
2981 An entry of the form EXTENT indicates that EXTENT was attached in
2982 the buffer. Undoing an entry of this form detaches EXTENT.
2984 An entry of the form (EXTENT START END) indicates that EXTENT was
2985 detached from the buffer. Undoing an entry of this form attaches
2986 EXTENT from START to END.
2988 An entry of the form POSITION indicates that point was at the buffer
2989 location given by the integer. Undoing an entry of this form places
2992 nil marks undo boundaries. The undo command treats the changes
2993 between two undo boundaries as a single step to be undone.
2995 If the value of the variable is t, undo information is not recorded.
2999 xxDEFVAR_BUFFER_LOCAL ("mark-active", mark_active /*
3000 Non-nil means the mark and region are currently active in this buffer.
3001 Automatically local in all buffers.
3003 #endif /* FSFmacs */
3005 #ifdef REGION_CACHE_NEEDS_WORK
3006 xxDEFVAR_BUFFER_LOCAL ("cache-long-line-scans", cache_long_line_scans /*
3007 Non-nil means that Emacs should use caches to handle long lines more quickly.
3008 This variable is buffer-local, in all buffers.
3010 Normally, the line-motion functions work by scanning the buffer for
3011 newlines. Columnar operations (like move-to-column and
3012 compute-motion) also work by scanning the buffer, summing character
3013 widths as they go. This works well for ordinary text, but if the
3014 buffer's lines are very long (say, more than 500 characters), these
3015 motion functions will take longer to execute. Emacs may also take
3016 longer to update the display.
3018 If cache-long-line-scans is non-nil, these motion functions cache the
3019 results of their scans, and consult the cache to avoid rescanning
3020 regions of the buffer until the text is modified. The caches are most
3021 beneficial when they prevent the most searching---that is, when the
3022 buffer contains long lines and large regions of characters with the
3023 same, fixed screen width.
3025 When cache-long-line-scans is non-nil, processing short lines will
3026 become slightly slower (because of the overhead of consulting the
3027 cache), and the caches will use memory roughly proportional to the
3028 number of newlines and characters whose screen width varies.
3030 The caches require no explicit maintenance; their accuracy is
3031 maintained internally by the Emacs primitives. Enabling or disabling
3032 the cache should not affect the behavior of any of the motion
3033 functions; it should only affect their performance.
3035 #endif /* REGION_CACHE_NEEDS_WORK */
3037 DEFVAR_BUFFER_LOCAL ("point-before-scroll", point_before_scroll /*
3038 Value of point before the last series of scroll operations, or nil.
3041 DEFVAR_BUFFER_LOCAL ("buffer-file-format", file_format /*
3042 List of formats to use when saving this buffer.
3043 Formats are defined by `format-alist'. This variable is
3044 set when a file is visited. Automatically local in all buffers.
3047 DEFVAR_BUFFER_LOCAL_MAGIC ("buffer-invisibility-spec", invisibility_spec /*
3048 Invisibility spec of this buffer.
3049 The default is t, which means that text is invisible
3050 if it has (or is covered by an extent with) a non-nil `invisible' property.
3051 If the value is a list, a text character is invisible if its `invisible'
3052 property is an element in that list.
3053 If an element is a cons cell of the form (PROP . ELLIPSIS),
3054 then characters with property value PROP are invisible,
3055 and they have an ellipsis as well if ELLIPSIS is non-nil.
3056 Note that the actual characters used for the ellipsis are controllable
3057 using `invisible-text-glyph', and default to "...".
3058 */, redisplay_variable_changed);
3060 DEFVAR_CONST_BUFFER_LOCAL ("generated-modeline-string",
3061 generated_modeline_string /*
3062 String of characters in this buffer's modeline as of the last redisplay.
3063 Each time the modeline is recomputed, the resulting characters are
3064 stored in this string, which is resized as necessary. You may not
3065 set this variable, and modifying this string will not change the
3066 modeline; you have to change `modeline-format' if you want that.
3068 For each extent in `modeline-format' that is encountered when
3069 processing the modeline, a corresponding extent is placed in
3070 `generated-modeline-string' and covers the text over which the
3071 extent in `modeline-format' applies. The extent in
3072 `generated-modeline-string' is made a child of the extent in
3073 `modeline-format', which means that it inherits all properties from
3074 that extent. Note that the extents in `generated-modeline-string'
3075 are managed automatically. You should not explicitly put any extents
3076 in `generated-modeline-string'; if you do, they will disappear the
3077 next time the modeline is processed.
3079 For extents in `modeline-format', the following properties are currently
3083 Affects the face of the modeline text. Currently, faces do
3084 not merge properly; only the most recently encountered face
3085 is used. This is a bug.
3088 Affects the disposition of button events over the modeline
3089 text. Multiple applicable keymaps *are* handled properly,
3090 and `modeline-map' still applies to any events that don't
3091 have bindings in extent-specific keymaps.
3094 If a string, causes the string to be displayed when the mouse
3095 moves over the text.
3098 /* Check for DEFVAR_BUFFER_LOCAL without initializing the corresponding
3099 slot of buffer_local_flags and vice-versa. Must be done after all
3100 DEFVAR_BUFFER_LOCAL() calls. */
3101 #define MARKED_SLOT(slot) \
3102 if ((XINT (buffer_local_flags.slot) != -2 && \
3103 XINT (buffer_local_flags.slot) != -3) \
3104 != !(NILP (XBUFFER (Vbuffer_local_symbols)->slot))) \
3106 #include "bufslots.h"
3110 Lisp_Object scratch = Fget_buffer_create (QSscratch);
3111 Fset_buffer (scratch);
3112 /* Want no undo records for *scratch* until after Emacs is dumped */
3113 Fbuffer_disable_undo (scratch);
3117 /* Is PWD another name for `.' ? */
3119 directory_is_current_directory (Extbyte *pwd)
3121 Bufbyte *pwd_internal;
3122 Bytecount pwd_internal_len;
3123 struct stat dotstat, pwdstat;
3125 TO_INTERNAL_FORMAT (DATA, (pwd, strlen ((char *)pwd) + 1),
3126 ALLOCA, (pwd_internal, pwd_internal_len),
3129 return (IS_DIRECTORY_SEP (*pwd_internal)
3130 && stat ((char *) pwd_internal, &pwdstat) == 0
3131 && stat (".", &dotstat) == 0
3132 && dotstat.st_ino == pwdstat.st_ino
3133 && dotstat.st_dev == pwdstat.st_dev
3134 && pwd_internal_len < MAXPATHLEN);
3138 init_initial_directory (void)
3140 /* This function can GC */
3144 initial_directory[0] = 0;
3146 /* If PWD is accurate, use it instead of calling getcwd. This is faster
3147 when PWD is right, and may avoid a fatal error. */
3148 if ((pwd = (Extbyte *) getenv ("PWD")) != NULL
3149 && directory_is_current_directory (pwd))
3150 strcpy (initial_directory, (char *) pwd);
3151 else if (getcwd (initial_directory, MAXPATHLEN) == NULL)
3152 fatal ("`getcwd' failed: %s\n", strerror (errno));
3154 /* Make sure pwd is DIRECTORY_SEP-terminated.
3155 Maybe this should really use some standard subroutine
3156 whose definition is filename syntax dependent. */
3158 int len = strlen (initial_directory);
3160 if (! IS_DIRECTORY_SEP (initial_directory[len - 1]))
3162 initial_directory[len] = DIRECTORY_SEP;
3163 initial_directory[len + 1] = '\0';
3167 /* XEmacs change: store buffer's default directory
3168 using preferred (i.e. as defined at compile-time)
3169 directory separator. --marcpa */
3171 #define CORRECT_DIR_SEPS(s) \
3172 do { if ('/' == DIRECTORY_SEP) dostounix_filename (s); \
3173 else unixtodos_filename (s); \
3176 CORRECT_DIR_SEPS(initial_directory);
3183 /* This function can GC */
3185 Fset_buffer (Fget_buffer_create (QSscratch));
3187 current_buffer->directory =
3188 build_ext_string (initial_directory, Qfile_name);
3191 /* #### is this correct? */
3192 temp = get_minibuffer (0);
3193 XBUFFER (temp)->directory = current_buffer->directory;
3194 #endif /* FSFmacs */