/* Buffer manipulation primitives for GNU Emacs. Copyright (C) 1985-2022 Free Software Foundation, Inc. This file is part of GNU Emacs. GNU Emacs is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. GNU Emacs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Emacs. If not, see . */ #include #include #include #include #include #include #include #include #include #include "lisp.h" #include "intervals.h" #include "process.h" #include "systime.h" #include "window.h" #include "commands.h" #include "character.h" #include "buffer.h" #include "region-cache.h" #include "indent.h" #include "blockinput.h" #include "keymap.h" #include "frame.h" #include "xwidget.h" #include "itree.h" #include "pdumper.h" #ifdef WINDOWSNT #include "w32heap.h" /* for mmap_* */ #endif /* This structure holds the default values of the buffer-local variables defined with DEFVAR_PER_BUFFER, that have special slots in each buffer. The default value occupies the same slot in this structure as an individual buffer's value occupies in that buffer. Setting the default value also goes through the alist of buffers and stores into each buffer that does not say it has a local value. */ struct buffer buffer_defaults; /* This structure marks which slots in a buffer have corresponding default values in buffer_defaults. Each such slot has a value in this structure. The value is a positive Lisp integer that must be smaller than MAX_PER_BUFFER_VARS. When a buffer has its own local value for a slot, the entry for that slot (found in the same slot in this structure) is turned on in the buffer's local_flags array. If a slot in this structure is -1, then even though there may be a DEFVAR_PER_BUFFER for the slot, there is no default value for it; and the corresponding slot in buffer_defaults is not used. If a slot in this structure corresponding to a DEFVAR_PER_BUFFER is zero, that is a bug. */ struct buffer buffer_local_flags; /* This structure holds the names of symbols whose values may be buffer-local. It is indexed and accessed in the same way as the above. */ struct buffer buffer_local_symbols; /* Return the symbol of the per-buffer variable at offset OFFSET in the buffer structure. */ #define PER_BUFFER_SYMBOL(OFFSET) \ (*(Lisp_Object *)((OFFSET) + (char *) &buffer_local_symbols)) /* Maximum length of an overlay vector. */ #define OVERLAY_COUNT_MAX \ ((ptrdiff_t) min (MOST_POSITIVE_FIXNUM, \ min (PTRDIFF_MAX, SIZE_MAX) / word_size)) /* Flags indicating which built-in buffer-local variables are permanent locals. */ static char buffer_permanent_local_flags[MAX_PER_BUFFER_VARS]; /* Number of per-buffer variables used. */ static int last_per_buffer_idx; static void call_overlay_mod_hooks (Lisp_Object list, Lisp_Object overlay, bool after, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3); static void reset_buffer_local_variables (struct buffer *, bool); /* Alist of all buffer names vs the buffers. This used to be a Lisp-visible variable, but is no longer, to prevent lossage due to user rplac'ing this alist or its elements. */ Lisp_Object Vbuffer_alist; static Lisp_Object QSFundamental; /* A string "Fundamental". */ static void alloc_buffer_text (struct buffer *, ptrdiff_t); static void free_buffer_text (struct buffer *b); static void copy_overlays (struct buffer *, struct buffer *); static void modify_overlay (struct buffer *, ptrdiff_t, ptrdiff_t); static Lisp_Object buffer_lisp_local_variables (struct buffer *, bool); static Lisp_Object buffer_local_variables_1 (struct buffer *buf, int offset, Lisp_Object sym); static void CHECK_OVERLAY (Lisp_Object x) { CHECK_TYPE (OVERLAYP (x), Qoverlayp, x); } /* Convert the position POS to an EMACS_INT that fits in a fixnum. Yield POS's value if POS is already a fixnum, POS's marker position if POS is a marker, and MOST_NEGATIVE_FIXNUM or MOST_POSITIVE_FIXNUM if POS is a negative or positive bignum. Signal an error if POS is not of the proper form. */ EMACS_INT fix_position (Lisp_Object pos) { if (FIXNUMP (pos)) return XFIXNUM (pos); if (MARKERP (pos)) return marker_position (pos); CHECK_TYPE (BIGNUMP (pos), Qinteger_or_marker_p, pos); return !NILP (Fnatnump (pos)) ? MOST_POSITIVE_FIXNUM : MOST_NEGATIVE_FIXNUM; } /* These setters are used only in this file, so they can be private. The public setters are inline functions defined in buffer.h. */ static void bset_abbrev_mode (struct buffer *b, Lisp_Object val) { b->abbrev_mode_ = val; } static void bset_abbrev_table (struct buffer *b, Lisp_Object val) { b->abbrev_table_ = val; } static void bset_auto_fill_function (struct buffer *b, Lisp_Object val) { b->auto_fill_function_ = val; } static void bset_auto_save_file_format (struct buffer *b, Lisp_Object val) { b->auto_save_file_format_ = val; } static void bset_auto_save_file_name (struct buffer *b, Lisp_Object val) { b->auto_save_file_name_ = val; } static void bset_backed_up (struct buffer *b, Lisp_Object val) { b->backed_up_ = val; } static void bset_begv_marker (struct buffer *b, Lisp_Object val) { b->begv_marker_ = val; } static void bset_bidi_display_reordering (struct buffer *b, Lisp_Object val) { b->bidi_display_reordering_ = val; } static void bset_bidi_paragraph_start_re (struct buffer *b, Lisp_Object val) { b->bidi_paragraph_start_re_ = val; } static void bset_bidi_paragraph_separate_re (struct buffer *b, Lisp_Object val) { b->bidi_paragraph_separate_re_ = val; } static void bset_buffer_file_coding_system (struct buffer *b, Lisp_Object val) { b->buffer_file_coding_system_ = val; } static void bset_case_fold_search (struct buffer *b, Lisp_Object val) { b->case_fold_search_ = val; } static void bset_ctl_arrow (struct buffer *b, Lisp_Object val) { b->ctl_arrow_ = val; } static void bset_cursor_in_non_selected_windows (struct buffer *b, Lisp_Object val) { b->cursor_in_non_selected_windows_ = val; } static void bset_cursor_type (struct buffer *b, Lisp_Object val) { b->cursor_type_ = val; } static void bset_display_table (struct buffer *b, Lisp_Object val) { b->display_table_ = val; } static void bset_extra_line_spacing (struct buffer *b, Lisp_Object val) { b->extra_line_spacing_ = val; } #ifdef HAVE_TREE_SITTER static void bset_ts_parser_list (struct buffer *b, Lisp_Object val) { b->ts_parser_list_ = val; } #endif static void bset_file_format (struct buffer *b, Lisp_Object val) { b->file_format_ = val; } static void bset_file_truename (struct buffer *b, Lisp_Object val) { b->file_truename_ = val; } static void bset_fringe_cursor_alist (struct buffer *b, Lisp_Object val) { b->fringe_cursor_alist_ = val; } static void bset_fringe_indicator_alist (struct buffer *b, Lisp_Object val) { b->fringe_indicator_alist_ = val; } static void bset_fringes_outside_margins (struct buffer *b, Lisp_Object val) { b->fringes_outside_margins_ = val; } static void bset_header_line_format (struct buffer *b, Lisp_Object val) { b->header_line_format_ = val; } static void bset_tab_line_format (struct buffer *b, Lisp_Object val) { b->tab_line_format_ = val; } static void bset_indicate_buffer_boundaries (struct buffer *b, Lisp_Object val) { b->indicate_buffer_boundaries_ = val; } static void bset_indicate_empty_lines (struct buffer *b, Lisp_Object val) { b->indicate_empty_lines_ = val; } static void bset_invisibility_spec (struct buffer *b, Lisp_Object val) { b->invisibility_spec_ = val; } static void bset_left_fringe_width (struct buffer *b, Lisp_Object val) { b->left_fringe_width_ = val; } static void bset_major_mode (struct buffer *b, Lisp_Object val) { b->major_mode_ = val; } static void bset_local_minor_modes (struct buffer *b, Lisp_Object val) { b->local_minor_modes_ = val; } static void bset_mark (struct buffer *b, Lisp_Object val) { b->mark_ = val; } static void bset_mode_line_format (struct buffer *b, Lisp_Object val) { b->mode_line_format_ = val; } static void bset_mode_name (struct buffer *b, Lisp_Object val) { b->mode_name_ = val; } static void bset_name (struct buffer *b, Lisp_Object val) { b->name_ = val; } static void bset_overwrite_mode (struct buffer *b, Lisp_Object val) { b->overwrite_mode_ = val; } static void bset_pt_marker (struct buffer *b, Lisp_Object val) { b->pt_marker_ = val; } static void bset_right_fringe_width (struct buffer *b, Lisp_Object val) { b->right_fringe_width_ = val; } static void bset_save_length (struct buffer *b, Lisp_Object val) { b->save_length_ = val; } static void bset_scroll_bar_width (struct buffer *b, Lisp_Object val) { b->scroll_bar_width_ = val; } static void bset_scroll_bar_height (struct buffer *b, Lisp_Object val) { b->scroll_bar_height_ = val; } static void bset_scroll_down_aggressively (struct buffer *b, Lisp_Object val) { b->scroll_down_aggressively_ = val; } static void bset_scroll_up_aggressively (struct buffer *b, Lisp_Object val) { b->scroll_up_aggressively_ = val; } static void bset_selective_display (struct buffer *b, Lisp_Object val) { b->selective_display_ = val; } static void bset_selective_display_ellipses (struct buffer *b, Lisp_Object val) { b->selective_display_ellipses_ = val; } static void bset_vertical_scroll_bar_type (struct buffer *b, Lisp_Object val) { b->vertical_scroll_bar_type_ = val; } static void bset_horizontal_scroll_bar_type (struct buffer *b, Lisp_Object val) { b->horizontal_scroll_bar_type_ = val; } static void bset_word_wrap (struct buffer *b, Lisp_Object val) { b->word_wrap_ = val; } static void bset_zv_marker (struct buffer *b, Lisp_Object val) { b->zv_marker_ = val; } void nsberror (Lisp_Object spec) { if (STRINGP (spec)) error ("No buffer named %s", SDATA (spec)); error ("Invalid buffer argument"); } DEFUN ("buffer-live-p", Fbuffer_live_p, Sbuffer_live_p, 1, 1, 0, doc: /* Return t if OBJECT is a buffer which has not been killed. Value is nil if OBJECT is not a buffer or if it has been killed. */) (Lisp_Object object) { return ((BUFFERP (object) && BUFFER_LIVE_P (XBUFFER (object))) ? Qt : Qnil); } DEFUN ("buffer-list", Fbuffer_list, Sbuffer_list, 0, 1, 0, doc: /* Return a list of all live buffers. If the optional arg FRAME is a frame, return the buffer list in the proper order for that frame: the buffers shown in FRAME come first, followed by the rest of the buffers. */) (Lisp_Object frame) { Lisp_Object general; general = Fmapcar (Qcdr, Vbuffer_alist); if (FRAMEP (frame)) { Lisp_Object framelist, prevlist, tail; framelist = Fcopy_sequence (XFRAME (frame)->buffer_list); prevlist = Fnreverse (Fcopy_sequence (XFRAME (frame)->buried_buffer_list)); /* Remove from GENERAL any buffer that duplicates one in FRAMELIST or PREVLIST. */ tail = framelist; while (CONSP (tail)) { general = Fdelq (XCAR (tail), general); tail = XCDR (tail); } tail = prevlist; while (CONSP (tail)) { general = Fdelq (XCAR (tail), general); tail = XCDR (tail); } return CALLN (Fnconc, framelist, general, prevlist); } else return general; } /* Like Fassoc, but use Fstring_equal to compare (which ignores text properties), and don't ever quit. */ static Lisp_Object assoc_ignore_text_properties (Lisp_Object key, Lisp_Object list) { Lisp_Object tail; for (tail = list; CONSP (tail); tail = XCDR (tail)) { Lisp_Object elt = XCAR (tail); if (!NILP (Fstring_equal (Fcar (elt), key))) return elt; } return Qnil; } DEFUN ("get-buffer", Fget_buffer, Sget_buffer, 1, 1, 0, doc: /* Return the buffer named BUFFER-OR-NAME. BUFFER-OR-NAME must be either a string or a buffer. If BUFFER-OR-NAME is a string and there is no buffer with that name, return nil. If BUFFER-OR-NAME is a buffer, return it as given. */) (register Lisp_Object buffer_or_name) { if (BUFFERP (buffer_or_name)) return buffer_or_name; CHECK_STRING (buffer_or_name); return Fcdr (assoc_ignore_text_properties (buffer_or_name, Vbuffer_alist)); } DEFUN ("get-file-buffer", Fget_file_buffer, Sget_file_buffer, 1, 1, 0, doc: /* Return the buffer visiting file FILENAME (a string). The buffer's `buffer-file-name' must match exactly the expansion of FILENAME. If there is no such live buffer, return nil. See also `find-buffer-visiting'. */) (register Lisp_Object filename) { register Lisp_Object tail, buf, handler; CHECK_STRING (filename); filename = Fexpand_file_name (filename, Qnil); /* If the file name has special constructs in it, call the corresponding file name handler. */ handler = Ffind_file_name_handler (filename, Qget_file_buffer); if (!NILP (handler)) { Lisp_Object handled_buf = call2 (handler, Qget_file_buffer, filename); return BUFFERP (handled_buf) ? handled_buf : Qnil; } FOR_EACH_LIVE_BUFFER (tail, buf) { if (!STRINGP (BVAR (XBUFFER (buf), filename))) continue; if (!NILP (Fstring_equal (BVAR (XBUFFER (buf), filename), filename))) return buf; } return Qnil; } Lisp_Object get_truename_buffer (register Lisp_Object filename) { register Lisp_Object tail, buf; FOR_EACH_LIVE_BUFFER (tail, buf) { if (!STRINGP (BVAR (XBUFFER (buf), file_truename))) continue; if (!NILP (Fstring_equal (BVAR (XBUFFER (buf), file_truename), filename))) return buf; } return Qnil; } /* Run buffer-list-update-hook if Vrun_hooks is non-nil, and BUF is NULL or does not have buffer hooks inhibited. BUF is NULL when called by make-indirect-buffer, since it does not inhibit buffer hooks. */ static void run_buffer_list_update_hook (struct buffer *buf) { if (! (NILP (Vrun_hooks) || (buf && buf->inhibit_buffer_hooks))) call1 (Vrun_hooks, Qbuffer_list_update_hook); } DEFUN ("get-buffer-create", Fget_buffer_create, Sget_buffer_create, 1, 2, 0, doc: /* Return the buffer specified by BUFFER-OR-NAME, creating a new one if needed. If BUFFER-OR-NAME is a string and a live buffer with that name exists, return that buffer. If no such buffer exists, create a new buffer with that name and return it. If BUFFER-OR-NAME starts with a space, the new buffer does not keep undo information. If optional argument INHIBIT-BUFFER-HOOKS is non-nil, the new buffer does not run the hooks `kill-buffer-hook', `kill-buffer-query-functions', and `buffer-list-update-hook'. This avoids slowing down internal or temporary buffers that are never presented to users or passed on to other applications. If BUFFER-OR-NAME is a buffer instead of a string, return it as given, even if it is dead. The return value is never nil. */) (register Lisp_Object buffer_or_name, Lisp_Object inhibit_buffer_hooks) { register Lisp_Object buffer, name; register struct buffer *b; buffer = Fget_buffer (buffer_or_name); if (!NILP (buffer)) return buffer; if (SCHARS (buffer_or_name) == 0) error ("Empty string for buffer name is not allowed"); b = allocate_buffer (); /* An ordinary buffer uses its own struct buffer_text. */ b->text = &b->own_text; b->base_buffer = NULL; /* No one shares the text with us now. */ b->indirections = 0; /* No one shows us now. */ b->window_count = 0; memset (&b->local_flags, 0, sizeof (b->local_flags)); BUF_GAP_SIZE (b) = 20; block_input (); /* We allocate extra 1-byte at the tail and keep it always '\0' for anchoring a search. */ alloc_buffer_text (b, BUF_GAP_SIZE (b) + 1); unblock_input (); if (! BUF_BEG_ADDR (b)) buffer_memory_full (BUF_GAP_SIZE (b) + 1); b->pt = BEG; b->begv = BEG; b->zv = BEG; b->pt_byte = BEG_BYTE; b->begv_byte = BEG_BYTE; b->zv_byte = BEG_BYTE; BUF_GPT (b) = BEG; BUF_GPT_BYTE (b) = BEG_BYTE; BUF_Z (b) = BEG; BUF_Z_BYTE (b) = BEG_BYTE; BUF_MODIFF (b) = 1; BUF_CHARS_MODIFF (b) = 1; BUF_OVERLAY_MODIFF (b) = 1; BUF_SAVE_MODIFF (b) = 1; BUF_COMPACT (b) = 1; set_buffer_intervals (b, NULL); BUF_UNCHANGED_MODIFIED (b) = 1; BUF_OVERLAY_UNCHANGED_MODIFIED (b) = 1; BUF_CHARS_UNCHANGED_MODIFIED (b) = 1; BUF_END_UNCHANGED (b) = 0; BUF_BEG_UNCHANGED (b) = 0; *(BUF_GPT_ADDR (b)) = *(BUF_Z_ADDR (b)) = 0; /* Put an anchor '\0'. */ b->text->inhibit_shrinking = false; b->text->redisplay = false; b->newline_cache = 0; b->width_run_cache = 0; b->bidi_paragraph_cache = 0; bset_width_table (b, Qnil); b->prevent_redisplay_optimizations_p = 1; /* An ordinary buffer normally doesn't need markers to handle BEGV and ZV. */ bset_pt_marker (b, Qnil); bset_begv_marker (b, Qnil); bset_zv_marker (b, Qnil); name = Fcopy_sequence (buffer_or_name); set_string_intervals (name, NULL); bset_name (b, name); b->inhibit_buffer_hooks = !NILP (inhibit_buffer_hooks); bset_undo_list (b, SREF (name, 0) != ' ' ? Qnil : Qt); reset_buffer (b); reset_buffer_local_variables (b, 1); bset_mark (b, Fmake_marker ()); BUF_MARKERS (b) = NULL; /* Put this in the alist of all live buffers. */ XSETBUFFER (buffer, b); Vbuffer_alist = nconc2 (Vbuffer_alist, list1 (Fcons (name, buffer))); run_buffer_list_update_hook (b); return buffer; } static void add_buffer_overlay (struct buffer *b, struct Lisp_Overlay *ov, ptrdiff_t begin, ptrdiff_t end) { eassert (! ov->buffer); if (! b->overlays) b->overlays = itree_create (); ov->buffer = b; itree_insert (b->overlays, ov->interval, begin, end); } /* Copy overlays of buffer FROM to buffer TO. */ static void copy_overlays (struct buffer *from, struct buffer *to) { eassert (to && ! to->overlays); struct itree_node *node; ITREE_FOREACH (node, from->overlays, PTRDIFF_MIN, PTRDIFF_MAX, ASCENDING) { Lisp_Object ov = node->data; Lisp_Object copy = build_overlay (node->front_advance, node->rear_advance, Fcopy_sequence (OVERLAY_PLIST (ov))); add_buffer_overlay (to, XOVERLAY (copy), node->begin, node->end); } } bool valid_per_buffer_idx (int idx) { return 0 <= idx && idx < last_per_buffer_idx; } /* Clone per-buffer values of buffer FROM. Buffer TO gets the same per-buffer values as FROM, with the following exceptions: (1) TO's name is left untouched, (2) markers are copied and made to refer to TO, and (3) overlay lists are copied. */ static void clone_per_buffer_values (struct buffer *from, struct buffer *to) { int offset; FOR_EACH_PER_BUFFER_OBJECT_AT (offset) { Lisp_Object obj; /* Don't touch the `name' which should be unique for every buffer. */ if (offset == PER_BUFFER_VAR_OFFSET (name)) continue; obj = per_buffer_value (from, offset); if (MARKERP (obj) && XMARKER (obj)->buffer == from) { struct Lisp_Marker *m = XMARKER (obj); obj = build_marker (to, m->charpos, m->bytepos); XMARKER (obj)->insertion_type = m->insertion_type; } set_per_buffer_value (to, offset, obj); } memcpy (to->local_flags, from->local_flags, sizeof to->local_flags); copy_overlays (from, to); /* Get (a copy of) the alist of Lisp-level local variables of FROM and install that in TO. */ bset_local_var_alist (to, buffer_lisp_local_variables (from, 1)); } /* If buffer B has markers to record PT, BEGV and ZV when it is not current, update these markers. */ static void record_buffer_markers (struct buffer *b) { if (! NILP (BVAR (b, pt_marker))) { Lisp_Object buffer; eassert (!NILP (BVAR (b, begv_marker))); eassert (!NILP (BVAR (b, zv_marker))); XSETBUFFER (buffer, b); set_marker_both (BVAR (b, pt_marker), buffer, b->pt, b->pt_byte); set_marker_both (BVAR (b, begv_marker), buffer, b->begv, b->begv_byte); set_marker_both (BVAR (b, zv_marker), buffer, b->zv, b->zv_byte); } } /* If buffer B has markers to record PT, BEGV and ZV when it is not current, fetch these values into B->begv etc. */ static void fetch_buffer_markers (struct buffer *b) { if (! NILP (BVAR (b, pt_marker))) { Lisp_Object m; eassert (!NILP (BVAR (b, begv_marker))); eassert (!NILP (BVAR (b, zv_marker))); m = BVAR (b, pt_marker); SET_BUF_PT_BOTH (b, marker_position (m), marker_byte_position (m)); m = BVAR (b, begv_marker); SET_BUF_BEGV_BOTH (b, marker_position (m), marker_byte_position (m)); m = BVAR (b, zv_marker); SET_BUF_ZV_BOTH (b, marker_position (m), marker_byte_position (m)); } } DEFUN ("make-indirect-buffer", Fmake_indirect_buffer, Smake_indirect_buffer, 2, 4, "bMake indirect buffer (to buffer): \nBName of indirect buffer: ", doc: /* Create and return an indirect buffer for buffer BASE-BUFFER, named NAME. BASE-BUFFER should be a live buffer, or the name of an existing buffer. NAME should be a string which is not the name of an existing buffer. Optional argument CLONE non-nil means preserve BASE-BUFFER's state, such as major and minor modes, in the indirect buffer. CLONE nil means the indirect buffer's state is reset to default values. If optional argument INHIBIT-BUFFER-HOOKS is non-nil, the new buffer does not run the hooks `kill-buffer-hook', `kill-buffer-query-functions', and `buffer-list-update-hook'. */) (Lisp_Object base_buffer, Lisp_Object name, Lisp_Object clone, Lisp_Object inhibit_buffer_hooks) { Lisp_Object buf, tem; struct buffer *b; CHECK_STRING (name); buf = Fget_buffer (name); if (!NILP (buf)) error ("Buffer name `%s' is in use", SDATA (name)); tem = base_buffer; base_buffer = Fget_buffer (base_buffer); if (NILP (base_buffer)) error ("No such buffer: `%s'", SDATA (tem)); if (!BUFFER_LIVE_P (XBUFFER (base_buffer))) error ("Base buffer has been killed"); if (SCHARS (name) == 0) error ("Empty string for buffer name is not allowed"); b = allocate_buffer (); /* No double indirection - if base buffer is indirect, new buffer becomes an indirect to base's base. */ b->base_buffer = (XBUFFER (base_buffer)->base_buffer ? XBUFFER (base_buffer)->base_buffer : XBUFFER (base_buffer)); /* Use the base buffer's text object. */ b->text = b->base_buffer->text; /* We have no own text. */ b->indirections = -1; /* Notify base buffer that we share the text now. */ b->base_buffer->indirections++; /* Always -1 for an indirect buffer. */ b->window_count = -1; memset (&b->local_flags, 0, sizeof (b->local_flags)); b->pt = b->base_buffer->pt; b->begv = b->base_buffer->begv; b->zv = b->base_buffer->zv; b->pt_byte = b->base_buffer->pt_byte; b->begv_byte = b->base_buffer->begv_byte; b->zv_byte = b->base_buffer->zv_byte; b->inhibit_buffer_hooks = !NILP (inhibit_buffer_hooks); b->newline_cache = 0; b->width_run_cache = 0; b->bidi_paragraph_cache = 0; bset_width_table (b, Qnil); name = Fcopy_sequence (name); set_string_intervals (name, NULL); bset_name (b, name); /* An indirect buffer shares undo list of its base (Bug#18180). */ bset_undo_list (b, BVAR (b->base_buffer, undo_list)); reset_buffer (b); reset_buffer_local_variables (b, 1); /* Put this in the alist of all live buffers. */ XSETBUFFER (buf, b); Vbuffer_alist = nconc2 (Vbuffer_alist, list1 (Fcons (name, buf))); bset_mark (b, Fmake_marker ()); /* The multibyte status belongs to the base buffer. */ bset_enable_multibyte_characters (b, BVAR (b->base_buffer, enable_multibyte_characters)); /* Make sure the base buffer has markers for its narrowing. */ if (NILP (BVAR (b->base_buffer, pt_marker))) { eassert (NILP (BVAR (b->base_buffer, begv_marker))); eassert (NILP (BVAR (b->base_buffer, zv_marker))); bset_pt_marker (b->base_buffer, build_marker (b->base_buffer, b->base_buffer->pt, b->base_buffer->pt_byte)); bset_begv_marker (b->base_buffer, build_marker (b->base_buffer, b->base_buffer->begv, b->base_buffer->begv_byte)); bset_zv_marker (b->base_buffer, build_marker (b->base_buffer, b->base_buffer->zv, b->base_buffer->zv_byte)); XMARKER (BVAR (b->base_buffer, zv_marker))->insertion_type = 1; } if (NILP (clone)) { /* Give the indirect buffer markers for its narrowing. */ bset_pt_marker (b, build_marker (b, b->pt, b->pt_byte)); bset_begv_marker (b, build_marker (b, b->begv, b->begv_byte)); bset_zv_marker (b, build_marker (b, b->zv, b->zv_byte)); XMARKER (BVAR (b, zv_marker))->insertion_type = 1; } else { struct buffer *old_b = current_buffer; clone_per_buffer_values (b->base_buffer, b); bset_filename (b, Qnil); bset_file_truename (b, Qnil); bset_display_count (b, make_fixnum (0)); bset_backed_up (b, Qnil); bset_local_minor_modes (b, Qnil); bset_auto_save_file_name (b, Qnil); set_buffer_internal_1 (b); Fset (intern ("buffer-save-without-query"), Qnil); Fset (intern ("buffer-file-number"), Qnil); if (!NILP (Flocal_variable_p (Qbuffer_stale_function, base_buffer))) Fkill_local_variable (Qbuffer_stale_function); /* Cloned buffers need extra setup, to do things such as deep variable copies for list variables that might be mangled due to destructive operations in the indirect buffer. */ run_hook (Qclone_indirect_buffer_hook); set_buffer_internal_1 (old_b); } run_buffer_list_update_hook (NULL); return buf; } static void remove_buffer_overlay (struct buffer *b, struct Lisp_Overlay *ov) { eassert (b->overlays); eassert (ov->buffer == b); itree_remove (ov->buffer->overlays, ov->interval); ov->buffer = NULL; } /* Mark OV as no longer associated with its buffer. */ static void drop_overlay (struct Lisp_Overlay *ov) { if (! ov->buffer) return; modify_overlay (ov->buffer, overlay_start (ov), overlay_end (ov)); remove_buffer_overlay (ov->buffer, ov); } /* Delete all overlays of B and reset its overlay lists. */ void delete_all_overlays (struct buffer *b) { struct itree_node *node; if (! b->overlays) return; /* The general rule is that the tree cannot be modified from within ITREE_FOREACH, but here we bend this rule a little because we know that the POST_ORDER iterator will not need to look at `node` again. */ ITREE_FOREACH (node, b->overlays, PTRDIFF_MIN, PTRDIFF_MAX, POST_ORDER) { modify_overlay (b, node->begin, node->end); XOVERLAY (node->data)->buffer = NULL; node->parent = NULL; node->left = NULL; node->right = NULL; } itree_clear (b->overlays); } static void free_buffer_overlays (struct buffer *b) { /* Actually this does not free any overlay, but the tree only. --ap */ if (b->overlays) { itree_destroy (b->overlays); b->overlays = NULL; } } /* Adjust the position of overlays in the current buffer according to MULTIBYTE. Assume that positions currently correspond to byte positions, if MULTIBYTE is true and to character positions if not. */ static void set_overlays_multibyte (bool multibyte) { if (! current_buffer->overlays || Z == Z_BYTE) return; struct itree_node **nodes = NULL; struct itree_tree *tree = current_buffer->overlays; const intmax_t size = itree_size (tree); /* We can't use `itree_node_set_region` at the same time as we iterate over the itree, so we need an auxiliary storage to keep the list of nodes. */ USE_SAFE_ALLOCA; SAFE_NALLOCA (nodes, 1, size); { struct itree_node *node, **cursor = nodes; ITREE_FOREACH (node, tree, PTRDIFF_MIN, PTRDIFF_MAX, ASCENDING) *(cursor++) = node; } for (int i = 0; i < size; ++i, ++nodes) { struct itree_node * const node = *nodes; if (multibyte) { ptrdiff_t begin = itree_node_begin (tree, node); ptrdiff_t end = itree_node_end (tree, node); /* This models the behavior of markers. (The behavior of text-intervals differs slightly.) */ while (begin < Z_BYTE && !CHAR_HEAD_P (FETCH_BYTE (begin))) begin++; while (end < Z_BYTE && !CHAR_HEAD_P (FETCH_BYTE (end))) end++; itree_node_set_region (tree, node, BYTE_TO_CHAR (begin), BYTE_TO_CHAR (end)); } else { itree_node_set_region (tree, node, CHAR_TO_BYTE (node->begin), CHAR_TO_BYTE (node->end)); } } SAFE_FREE (); } /* Reinitialize everything about a buffer except its name and contents and local variables. If called on an already-initialized buffer, the list of overlays should be deleted before calling this function, otherwise we end up with overlays that claim to belong to the buffer but the buffer claims it doesn't belong to it. */ void reset_buffer (register struct buffer *b) { bset_filename (b, Qnil); bset_file_truename (b, Qnil); bset_directory (b, current_buffer ? BVAR (current_buffer, directory) : Qnil); b->modtime = make_timespec (0, UNKNOWN_MODTIME_NSECS); b->modtime_size = -1; XSETFASTINT (BVAR (b, save_length), 0); b->last_window_start = 1; /* It is more conservative to start out "changed" than "unchanged". */ b->clip_changed = 0; b->prevent_redisplay_optimizations_p = 1; b->long_line_optimizations_p = 0; bset_backed_up (b, Qnil); bset_local_minor_modes (b, Qnil); BUF_AUTOSAVE_MODIFF (b) = 0; b->auto_save_failure_time = 0; bset_auto_save_file_name (b, Qnil); bset_read_only (b, Qnil); b->overlays = NULL; bset_mark_active (b, Qnil); bset_point_before_scroll (b, Qnil); bset_file_format (b, Qnil); bset_auto_save_file_format (b, Qt); bset_last_selected_window (b, Qnil); bset_display_count (b, make_fixnum (0)); bset_display_time (b, Qnil); bset_enable_multibyte_characters (b, BVAR (&buffer_defaults, enable_multibyte_characters)); bset_cursor_type (b, BVAR (&buffer_defaults, cursor_type)); bset_extra_line_spacing (b, BVAR (&buffer_defaults, extra_line_spacing)); #ifdef HAVE_TREE_SITTER bset_ts_parser_list (b, Qnil); #endif b->display_error_modiff = 0; } /* Reset buffer B's local variables info. Don't use this on a buffer that has already been in use; it does not treat permanent locals consistently. Instead, use Fkill_all_local_variables. If PERMANENT_TOO, reset permanent buffer-local variables. If not, preserve those. */ static void reset_buffer_local_variables (struct buffer *b, bool permanent_too) { int offset, i; /* Reset the major mode to Fundamental, together with all the things that depend on the major mode. default-major-mode is handled at a higher level. We ignore it here. */ bset_major_mode (b, Qfundamental_mode); bset_keymap (b, Qnil); bset_mode_name (b, QSFundamental); /* If the standard case table has been altered and invalidated, fix up its insides first. */ if (! (CHAR_TABLE_P (XCHAR_TABLE (Vascii_downcase_table)->extras[0]) && CHAR_TABLE_P (XCHAR_TABLE (Vascii_downcase_table)->extras[1]) && CHAR_TABLE_P (XCHAR_TABLE (Vascii_downcase_table)->extras[2]))) Fset_standard_case_table (Vascii_downcase_table); bset_downcase_table (b, Vascii_downcase_table); bset_upcase_table (b, XCHAR_TABLE (Vascii_downcase_table)->extras[0]); bset_case_canon_table (b, XCHAR_TABLE (Vascii_downcase_table)->extras[1]); bset_case_eqv_table (b, XCHAR_TABLE (Vascii_downcase_table)->extras[2]); bset_invisibility_spec (b, Qt); /* Reset all (or most) per-buffer variables to their defaults. */ if (permanent_too) bset_local_var_alist (b, Qnil); else { Lisp_Object tmp, last = Qnil; Lisp_Object buffer; XSETBUFFER (buffer, b); for (tmp = BVAR (b, local_var_alist); CONSP (tmp); tmp = XCDR (tmp)) { Lisp_Object local_var = XCAR (XCAR (tmp)); Lisp_Object prop = Fget (local_var, Qpermanent_local); Lisp_Object sym = local_var; /* Watchers are run *before* modifying the var. */ if (XSYMBOL (local_var)->u.s.trapped_write == SYMBOL_TRAPPED_WRITE) notify_variable_watchers (local_var, Qnil, Qmakunbound, Fcurrent_buffer ()); eassert (XSYMBOL (sym)->u.s.redirect == SYMBOL_LOCALIZED); /* Need not do anything if some other buffer's binding is now cached. */ if (BASE_EQ (SYMBOL_BLV (XSYMBOL (sym))->where, buffer)) { /* Symbol is set up for this buffer's old local value: swap it out! */ swap_in_global_binding (XSYMBOL (sym)); } if (!NILP (prop)) { /* If permanent-local, keep it. */ last = tmp; if (EQ (prop, Qpermanent_local_hook)) { /* This is a partially permanent hook variable. Preserve only the elements that want to be preserved. */ Lisp_Object list, newlist; list = XCDR (XCAR (tmp)); if (!CONSP (list)) newlist = list; else for (newlist = Qnil; CONSP (list); list = XCDR (list)) { Lisp_Object elt = XCAR (list); /* Preserve element ELT if it's t, or if it is a function with a `permanent-local-hook' property. */ if (EQ (elt, Qt) || (SYMBOLP (elt) && !NILP (Fget (elt, Qpermanent_local_hook)))) newlist = Fcons (elt, newlist); } newlist = Fnreverse (newlist); if (XSYMBOL (local_var)->u.s.trapped_write == SYMBOL_TRAPPED_WRITE) notify_variable_watchers (local_var, newlist, Qmakunbound, Fcurrent_buffer ()); XSETCDR (XCAR (tmp), newlist); continue; /* Don't do variable write trapping twice. */ } } /* Delete this local variable. */ else if (NILP (last)) bset_local_var_alist (b, XCDR (tmp)); else XSETCDR (last, XCDR (tmp)); } } for (i = 0; i < last_per_buffer_idx; ++i) if (permanent_too || buffer_permanent_local_flags[i] == 0) SET_PER_BUFFER_VALUE_P (b, i, 0); /* For each slot that has a default value, copy that into the slot. */ FOR_EACH_PER_BUFFER_OBJECT_AT (offset) { int idx = PER_BUFFER_IDX (offset); if ((idx > 0 && (permanent_too || buffer_permanent_local_flags[idx] == 0))) set_per_buffer_value (b, offset, per_buffer_default (offset)); } } /* We split this away from generate-new-buffer, because rename-buffer and set-visited-file-name ought to be able to use this to really rename the buffer properly. */ DEFUN ("generate-new-buffer-name", Fgenerate_new_buffer_name, Sgenerate_new_buffer_name, 1, 2, 0, doc: /* Return a string that is the name of no existing buffer based on NAME. If there is no live buffer named NAME, then return NAME. Otherwise modify name by appending `', incrementing NUMBER \(starting at 2) until an unused name is found, and then return that name. Optional second argument IGNORE specifies a name that is okay to use (if it is in the sequence to be tried) even if a buffer with that name exists. If NAME begins with a space (i.e., a buffer that is not normally visible to users), then if buffer NAME already exists a random number is first appended to NAME, to speed up finding a non-existent buffer. */) (Lisp_Object name, Lisp_Object ignore) { Lisp_Object genbase; CHECK_STRING (name); if ((!NILP (ignore) && !NILP (Fstring_equal (name, ignore))) || NILP (Fget_buffer (name))) return name; if (SREF (name, 0) != ' ') /* See bug#1229. */ genbase = name; else { enum { bug_52711 = true }; /* https://bugs.gnu.org/57211 */ char number[bug_52711 ? INT_BUFSIZE_BOUND (int) + 1 : sizeof "-999999"]; EMACS_INT r = get_random (); eassume (0 <= r); int i = r % 1000000; AUTO_STRING_WITH_LEN (lnumber, number, sprintf (number, "-%d", i)); genbase = concat2 (name, lnumber); if (NILP (Fget_buffer (genbase))) return genbase; } for (ptrdiff_t count = 2; ; count++) { char number[INT_BUFSIZE_BOUND (ptrdiff_t) + sizeof "<>"]; AUTO_STRING_WITH_LEN (lnumber, number, sprintf (number, "<%"pD"d>", count)); Lisp_Object gentemp = concat2 (genbase, lnumber); if (!NILP (Fstring_equal (gentemp, ignore)) || NILP (Fget_buffer (gentemp))) return gentemp; } } DEFUN ("buffer-name", Fbuffer_name, Sbuffer_name, 0, 1, 0, doc: /* Return the name of BUFFER, as a string. BUFFER defaults to the current buffer. Return nil if BUFFER has been killed. */) (register Lisp_Object buffer) { return BVAR (decode_buffer (buffer), name); } DEFUN ("buffer-file-name", Fbuffer_file_name, Sbuffer_file_name, 0, 1, 0, doc: /* Return name of file BUFFER is visiting, or nil if none. No argument or nil as argument means use the current buffer. */) (register Lisp_Object buffer) { return BVAR (decode_buffer (buffer), filename); } DEFUN ("buffer-base-buffer", Fbuffer_base_buffer, Sbuffer_base_buffer, 0, 1, 0, doc: /* Return the base buffer of indirect buffer BUFFER. If BUFFER is not indirect, return nil. BUFFER defaults to the current buffer. */) (register Lisp_Object buffer) { struct buffer *base = decode_buffer (buffer)->base_buffer; return base ? (XSETBUFFER (buffer, base), buffer) : Qnil; } DEFUN ("buffer-local-value", Fbuffer_local_value, Sbuffer_local_value, 2, 2, 0, doc: /* Return the value of VARIABLE in BUFFER. If VARIABLE does not have a buffer-local binding in BUFFER, the value is the default binding of the variable. */) (register Lisp_Object variable, register Lisp_Object buffer) { register Lisp_Object result = buffer_local_value (variable, buffer); if (BASE_EQ (result, Qunbound)) xsignal1 (Qvoid_variable, variable); return result; } /* Like Fbuffer_local_value, but return Qunbound if the variable is locally unbound. */ Lisp_Object buffer_local_value (Lisp_Object variable, Lisp_Object buffer) { register struct buffer *buf; register Lisp_Object result; struct Lisp_Symbol *sym; CHECK_SYMBOL (variable); CHECK_BUFFER (buffer); buf = XBUFFER (buffer); sym = XSYMBOL (variable); start: switch (sym->u.s.redirect) { case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start; case SYMBOL_PLAINVAL: result = SYMBOL_VAL (sym); break; case SYMBOL_LOCALIZED: { /* Look in local_var_alist. */ struct Lisp_Buffer_Local_Value *blv = SYMBOL_BLV (sym); XSETSYMBOL (variable, sym); /* Update In case of aliasing. */ result = assq_no_quit (variable, BVAR (buf, local_var_alist)); if (!NILP (result)) { if (blv->fwd.fwdptr) { /* What binding is loaded right now? */ Lisp_Object current_alist_element = blv->valcell; /* The value of the currently loaded binding is not stored in it, but rather in the realvalue slot. Store that value into the binding it belongs to in case that is the one we are about to use. */ XSETCDR (current_alist_element, do_symval_forwarding (blv->fwd)); } /* Now get the (perhaps updated) value out of the binding. */ result = XCDR (result); } else result = Fdefault_value (variable); break; } case SYMBOL_FORWARDED: { lispfwd fwd = SYMBOL_FWD (sym); if (BUFFER_OBJFWDP (fwd)) result = per_buffer_value (buf, XBUFFER_OBJFWD (fwd)->offset); else result = Fdefault_value (variable); break; } default: emacs_abort (); } return result; } /* Return an alist of the Lisp-level buffer-local bindings of buffer BUF. That is, don't include the variables maintained in special slots in the buffer object. If not CLONE, replace elements of the form (VAR . unbound) by VAR. */ static Lisp_Object buffer_lisp_local_variables (struct buffer *buf, bool clone) { Lisp_Object result = Qnil; Lisp_Object tail; for (tail = BVAR (buf, local_var_alist); CONSP (tail); tail = XCDR (tail)) { Lisp_Object val, elt; elt = XCAR (tail); /* Reference each variable in the alist in buf. If inquiring about the current buffer, this gets the current values, so store them into the alist so the alist is up to date. If inquiring about some other buffer, this swaps out any values for that buffer, making the alist up to date automatically. */ val = find_symbol_value (XCAR (elt)); /* Use the current buffer value only if buf is the current buffer. */ if (buf != current_buffer) val = XCDR (elt); result = Fcons (!clone && BASE_EQ (val, Qunbound) ? XCAR (elt) : Fcons (XCAR (elt), val), result); } return result; } /* If the variable at position index OFFSET in buffer BUF has a buffer-local value, return (name . value). If SYM is non-nil, it replaces name. */ static Lisp_Object buffer_local_variables_1 (struct buffer *buf, int offset, Lisp_Object sym) { int idx = PER_BUFFER_IDX (offset); if ((idx == -1 || PER_BUFFER_VALUE_P (buf, idx)) && SYMBOLP (PER_BUFFER_SYMBOL (offset))) { sym = NILP (sym) ? PER_BUFFER_SYMBOL (offset) : sym; Lisp_Object val = per_buffer_value (buf, offset); return BASE_EQ (val, Qunbound) ? sym : Fcons (sym, val); } return Qnil; } DEFUN ("buffer-local-variables", Fbuffer_local_variables, Sbuffer_local_variables, 0, 1, 0, doc: /* Return an alist of variables that are buffer-local in BUFFER. Most elements look like (SYMBOL . VALUE), describing one variable. For a symbol that is locally unbound, just the symbol appears in the value. Note that storing new VALUEs in these elements doesn't change the variables. No argument or nil as argument means use current buffer as BUFFER. */) (Lisp_Object buffer) { struct buffer *buf = decode_buffer (buffer); Lisp_Object result = buffer_lisp_local_variables (buf, 0); Lisp_Object tem; /* Add on all the variables stored in special slots. */ { int offset; FOR_EACH_PER_BUFFER_OBJECT_AT (offset) { tem = buffer_local_variables_1 (buf, offset, Qnil); if (!NILP (tem)) result = Fcons (tem, result); } } tem = buffer_local_variables_1 (buf, PER_BUFFER_VAR_OFFSET (undo_list), intern ("buffer-undo-list")); if (!NILP (tem)) result = Fcons (tem, result); return result; } DEFUN ("buffer-modified-p", Fbuffer_modified_p, Sbuffer_modified_p, 0, 1, 0, doc: /* Return non-nil if BUFFER was modified since its file was last read or saved. No argument or nil as argument means use current buffer as BUFFER. If BUFFER was autosaved since it was last modified, this function returns the symbol `autosaved'. */) (Lisp_Object buffer) { struct buffer *buf = decode_buffer (buffer); if (BUF_SAVE_MODIFF (buf) < BUF_MODIFF (buf)) { if (BUF_AUTOSAVE_MODIFF (buf) == BUF_MODIFF (buf)) return Qautosaved; else return Qt; } else return Qnil; } DEFUN ("force-mode-line-update", Fforce_mode_line_update, Sforce_mode_line_update, 0, 1, 0, doc: /* Force redisplay of the current buffer's mode line and header line. With optional non-nil ALL, force redisplay of all mode lines, tab lines and header lines. This function also forces recomputation of the menu bar menus and the frame title. */) (Lisp_Object all) { if (!NILP (all)) { update_mode_lines = 10; /* FIXME: This can't be right. */ current_buffer->prevent_redisplay_optimizations_p = true; } else if (buffer_window_count (current_buffer)) { bset_update_mode_line (current_buffer); current_buffer->prevent_redisplay_optimizations_p = true; } return all; } DEFUN ("set-buffer-modified-p", Fset_buffer_modified_p, Sset_buffer_modified_p, 1, 1, 0, doc: /* Mark current buffer as modified or unmodified according to FLAG. A non-nil FLAG means mark the buffer modified. In addition, this function unconditionally forces redisplay of the mode lines of the windows that display the current buffer, and also locks or unlocks the file visited by the buffer, depending on whether the function's argument is non-nil, but only if both `buffer-file-name' and `buffer-file-truename' are non-nil. */) (Lisp_Object flag) { Frestore_buffer_modified_p (flag); /* Set update_mode_lines only if buffer is displayed in some window. Packages like jit-lock or lazy-lock preserve a buffer's modified state by recording/restoring the state around blocks of code. Setting update_mode_lines makes redisplay consider all windows (on all frames). Stealth fontification of buffers not displayed would incur additional redisplay costs if we'd set update_modes_lines unconditionally. Ideally, I think there should be another mechanism for fontifying buffers without "modifying" buffers, or redisplay should be smarter about updating the `*' in mode lines. --gerd */ return Fforce_mode_line_update (Qnil); } DEFUN ("restore-buffer-modified-p", Frestore_buffer_modified_p, Srestore_buffer_modified_p, 1, 1, 0, doc: /* Like `set-buffer-modified-p', but doesn't redisplay buffer's mode line. A nil FLAG means to mark the buffer as unmodified. A non-nil FLAG means mark the buffer as modified. A special value of `autosaved' will mark the buffer as modified and also as autosaved since it was last modified. This function also locks or unlocks the file visited by the buffer, if both `buffer-file-truename' and `buffer-file-name' are non-nil. It is not ensured that mode lines will be updated to show the modified state of the current buffer. Use with care. */) (Lisp_Object flag) { /* If buffer becoming modified, lock the file. If buffer becoming unmodified, unlock the file. */ struct buffer *b = current_buffer->base_buffer ? current_buffer->base_buffer : current_buffer; if (!inhibit_modification_hooks) { Lisp_Object fn = BVAR (b, file_truename); /* Test buffer-file-name so that binding it to nil is effective. */ if (!NILP (fn) && ! NILP (BVAR (b, filename))) { bool already = SAVE_MODIFF < MODIFF; if (!already && !NILP (flag)) Flock_file (fn); else if (already && NILP (flag)) Funlock_file (fn); } } /* Here we have a problem. SAVE_MODIFF is used here to encode buffer-modified-p (as SAVE_MODIFF=auto_save_modified we risk changing recent-auto-save-p from nil to t. */ if (NILP (flag)) /* This unavoidably sets recent-auto-save-p to nil. */ SAVE_MODIFF = MODIFF; else { /* If SAVE_MODIFF == auto_save_modified == MODIFF, we can either decrease SAVE_MODIFF and auto_save_modified or increase MODIFF. */ if (SAVE_MODIFF >= MODIFF) SAVE_MODIFF = modiff_incr (&MODIFF, 1); if (EQ (flag, Qautosaved)) BUF_AUTOSAVE_MODIFF (b) = MODIFF; } return flag; } DEFUN ("buffer-modified-tick", Fbuffer_modified_tick, Sbuffer_modified_tick, 0, 1, 0, doc: /* Return BUFFER's tick counter, incremented for each change in text. Each buffer has a tick counter which is incremented each time the text in that buffer is changed. No argument or nil as argument means use current buffer as BUFFER. */) (Lisp_Object buffer) { return modiff_to_integer (BUF_MODIFF (decode_buffer (buffer))); } DEFUN ("internal--set-buffer-modified-tick", Finternal__set_buffer_modified_tick, Sinternal__set_buffer_modified_tick, 1, 2, 0, doc: /* Set BUFFER's tick counter to TICK. No argument or nil as argument means use current buffer as BUFFER. */) (Lisp_Object tick, Lisp_Object buffer) { CHECK_FIXNUM (tick); BUF_MODIFF (decode_buffer (buffer)) = XFIXNUM (tick); return Qnil; } DEFUN ("buffer-chars-modified-tick", Fbuffer_chars_modified_tick, Sbuffer_chars_modified_tick, 0, 1, 0, doc: /* Return BUFFER's character-change tick counter. Each buffer has a character-change tick counter, which is set to the value of the buffer's tick counter (see `buffer-modified-tick'), each time text in that buffer is inserted or deleted. By comparing the values returned by two individual calls of `buffer-chars-modified-tick', you can tell whether a character change occurred in that buffer in between these calls. No argument or nil as argument means use current buffer as BUFFER. */) (Lisp_Object buffer) { return modiff_to_integer (BUF_CHARS_MODIFF (decode_buffer (buffer))); } DEFUN ("rename-buffer", Frename_buffer, Srename_buffer, 1, 2, "(list (read-string \"Rename buffer (to new name): \" \ nil 'buffer-name-history (buffer-name (current-buffer))) \ current-prefix-arg)", doc: /* Change current buffer's name to NEWNAME (a string). If second arg UNIQUE is nil or omitted, it is an error if a buffer named NEWNAME already exists. If UNIQUE is non-nil, come up with a new name using `generate-new-buffer-name'. Interactively, you can set UNIQUE with a prefix argument. We return the name we actually gave the buffer. This does not change the name of the visited file (if any). */) (register Lisp_Object newname, Lisp_Object unique) { register Lisp_Object tem, buf; Lisp_Object requestedname = newname; CHECK_STRING (newname); if (SCHARS (newname) == 0) error ("Empty string is invalid as a buffer name"); tem = Fget_buffer (newname); if (!NILP (tem)) { /* Don't short-circuit if UNIQUE is t. That is a useful way to rename the buffer automatically so you can create another with the original name. It makes UNIQUE equivalent to (rename-buffer (generate-new-buffer-name NEWNAME)). */ if (NILP (unique) && XBUFFER (tem) == current_buffer) return BVAR (current_buffer, name); if (!NILP (unique)) newname = Fgenerate_new_buffer_name (newname, BVAR (current_buffer, name)); else error ("Buffer name `%s' is in use", SDATA (newname)); } bset_name (current_buffer, newname); /* Catch redisplay's attention. Unless we do this, the mode lines for any windows displaying current_buffer will stay unchanged. */ bset_update_mode_line (current_buffer); XSETBUFFER (buf, current_buffer); Fsetcar (Frassq (buf, Vbuffer_alist), newname); if (NILP (BVAR (current_buffer, filename)) && !NILP (BVAR (current_buffer, auto_save_file_name))) call0 (intern ("rename-auto-save-file")); run_buffer_list_update_hook (current_buffer); call2 (intern ("uniquify--rename-buffer-advice"), requestedname, unique); /* Refetch since that last call may have done GC. */ return BVAR (current_buffer, name); } /* True if B can be used as 'other-than-BUFFER' buffer. */ static bool candidate_buffer (Lisp_Object b, Lisp_Object buffer) { return (BUFFERP (b) && !BASE_EQ (b, buffer) && BUFFER_LIVE_P (XBUFFER (b)) && !BUFFER_HIDDEN_P (XBUFFER (b))); } DEFUN ("other-buffer", Fother_buffer, Sother_buffer, 0, 3, 0, doc: /* Return most recently selected buffer other than BUFFER. Buffers not visible in windows are preferred to visible buffers, unless optional second argument VISIBLE-OK is non-nil. Ignore the argument BUFFER unless it denotes a live buffer. If the optional third argument FRAME specifies a live frame, then use that frame's buffer list instead of the selected frame's buffer list. The buffer is found by scanning the selected or specified frame's buffer list first, followed by the list of all buffers. If no other buffer exists, return the buffer `*scratch*' (creating it if necessary). */) (Lisp_Object buffer, Lisp_Object visible_ok, Lisp_Object frame) { struct frame *f = decode_live_frame (frame); Lisp_Object tail = f->buffer_list, pred = f->buffer_predicate; Lisp_Object buf, notsogood = Qnil; /* Consider buffers that have been seen in the frame first. */ for (; CONSP (tail); tail = XCDR (tail)) { buf = XCAR (tail); if (candidate_buffer (buf, buffer) /* If the frame has a buffer_predicate, disregard buffers that don't fit the predicate. */ && (NILP (pred) || !NILP (call1 (pred, buf)))) { if (!NILP (visible_ok) || NILP (Fget_buffer_window (buf, Qvisible))) return buf; else if (NILP (notsogood)) notsogood = buf; } } /* Consider alist of all buffers next. */ FOR_EACH_LIVE_BUFFER (tail, buf) { if (candidate_buffer (buf, buffer) /* If the frame has a buffer_predicate, disregard buffers that don't fit the predicate. */ && (NILP (pred) || !NILP (call1 (pred, buf)))) { if (!NILP (visible_ok) || NILP (Fget_buffer_window (buf, Qvisible))) return buf; else if (NILP (notsogood)) notsogood = buf; } } if (!NILP (notsogood)) return notsogood; else return safe_call (1, Qget_scratch_buffer_create); } /* The following function is a safe variant of Fother_buffer: It doesn't pay attention to any frame-local buffer lists, doesn't care about visibility of buffers, and doesn't evaluate any frame predicates. */ Lisp_Object other_buffer_safely (Lisp_Object buffer) { Lisp_Object tail, buf; FOR_EACH_LIVE_BUFFER (tail, buf) if (candidate_buffer (buf, buffer)) return buf; return safe_call (1, Qget_scratch_buffer_create); } DEFUN ("buffer-enable-undo", Fbuffer_enable_undo, Sbuffer_enable_undo, 0, 1, "", doc: /* Start keeping undo information for buffer BUFFER. No argument or nil as argument means do this for the current buffer. */) (register Lisp_Object buffer) { Lisp_Object real_buffer; if (NILP (buffer)) XSETBUFFER (real_buffer, current_buffer); else { real_buffer = Fget_buffer (buffer); if (NILP (real_buffer)) nsberror (buffer); } if (EQ (BVAR (XBUFFER (real_buffer), undo_list), Qt)) bset_undo_list (XBUFFER (real_buffer), Qnil); return Qnil; } /* Truncate undo list and shrink the gap of BUFFER. */ void compact_buffer (struct buffer *buffer) { BUFFER_CHECK_INDIRECTION (buffer); /* Skip dead buffers, indirect buffers and buffers which aren't changed since last compaction. */ if (BUFFER_LIVE_P (buffer) && (buffer->base_buffer == NULL) && (BUF_COMPACT (buffer) != BUF_MODIFF (buffer))) { /* If a buffer's undo list is Qt, that means that undo is turned off in that buffer. Calling truncate_undo_list on Qt tends to return NULL, which effectively turns undo back on. So don't call truncate_undo_list if undo_list is Qt. */ if (!EQ (BVAR(buffer, undo_list), Qt)) truncate_undo_list (buffer); /* Shrink buffer gaps. */ if (!buffer->text->inhibit_shrinking) { /* If a buffer's gap size is more than 10% of the buffer size, or larger than GAP_BYTES_DFL bytes, then shrink it accordingly. Keep a minimum size of GAP_BYTES_MIN bytes. */ ptrdiff_t size = clip_to_bounds (GAP_BYTES_MIN, BUF_Z_BYTE (buffer) / 10, GAP_BYTES_DFL); if (BUF_GAP_SIZE (buffer) > size) make_gap_1 (buffer, -(BUF_GAP_SIZE (buffer) - size)); } BUF_COMPACT (buffer) = BUF_MODIFF (buffer); } } DEFUN ("kill-buffer", Fkill_buffer, Skill_buffer, 0, 1, "bKill buffer: ", doc: /* Kill the buffer specified by BUFFER-OR-NAME. The argument may be a buffer or the name of an existing buffer. Argument nil or omitted means kill the current buffer. Return t if the buffer is actually killed, nil otherwise. The functions in `kill-buffer-query-functions' are called with the buffer to be killed as the current buffer. If any of them returns nil, the buffer is not killed. The hook `kill-buffer-hook' is run before the buffer is actually killed. The buffer being killed will be current while the hook is running. Functions called by any of these hooks are supposed to not change the current buffer. Neither hook is run for internal or temporary buffers created by `get-buffer-create' or `generate-new-buffer' with argument INHIBIT-BUFFER-HOOKS non-nil. Any processes that have this buffer as the `process-buffer' are killed with SIGHUP. This function calls `replace-buffer-in-windows' for cleaning up all windows currently displaying the buffer to be killed. */) (Lisp_Object buffer_or_name) { Lisp_Object buffer; struct buffer *b; Lisp_Object tem; struct Lisp_Marker *m; if (NILP (buffer_or_name)) buffer = Fcurrent_buffer (); else buffer = Fget_buffer (buffer_or_name); if (NILP (buffer)) nsberror (buffer_or_name); b = XBUFFER (buffer); /* Avoid trouble for buffer already dead. */ if (!BUFFER_LIVE_P (b)) return Qnil; if (thread_check_current_buffer (b)) return Qnil; /* Run hooks with the buffer to be killed as the current buffer. */ { specpdl_ref count = SPECPDL_INDEX (); bool modified; record_unwind_protect_excursion (); set_buffer_internal (b); /* First run the query functions; if any query is answered no, don't kill the buffer. */ if (!b->inhibit_buffer_hooks) { tem = CALLN (Frun_hook_with_args_until_failure, Qkill_buffer_query_functions); if (NILP (tem)) return unbind_to (count, Qnil); } /* Is this a modified buffer that's visiting a file? */ modified = !NILP (BVAR (b, filename)) && BUF_MODIFF (b) > BUF_SAVE_MODIFF (b); /* Query if the buffer is still modified. */ if (INTERACTIVE && modified) { /* Ask whether to kill the buffer, and exit if the user says "no". */ if (NILP (call1 (Qkill_buffer__possibly_save, buffer))) return unbind_to (count, Qnil); /* Recheck modified. */ modified = BUF_MODIFF (b) > BUF_SAVE_MODIFF (b); } /* Delete the autosave file, if requested. */ if (modified && kill_buffer_delete_auto_save_files && delete_auto_save_files && !NILP (Frecent_auto_save_p ()) && STRINGP (BVAR (b, auto_save_file_name)) && !NILP (Ffile_exists_p (BVAR (b, auto_save_file_name))) /* If `auto-save-visited-mode' is on, then we're auto-saving to the visited file -- don't delete it.. */ && NILP (Fstring_equal (BVAR (b, auto_save_file_name), BVAR (b, filename)))) { tem = do_yes_or_no_p (build_string ("Delete auto-save file? ")); if (!NILP (tem)) call0 (intern ("delete-auto-save-file-if-necessary")); } /* If the hooks have killed the buffer, exit now. */ if (!BUFFER_LIVE_P (b)) return unbind_to (count, Qt); /* Then run the hooks. */ if (!b->inhibit_buffer_hooks) run_hook (Qkill_buffer_hook); unbind_to (count, Qnil); } /* If the hooks have killed the buffer, exit now. */ if (!BUFFER_LIVE_P (b)) return Qt; /* We have no more questions to ask. Verify that it is valid to kill the buffer. This must be done after the questions since anything can happen within do_yes_or_no_p. */ /* Don't kill the minibuffer now current. */ if (BASE_EQ (buffer, XWINDOW (minibuf_window)->contents)) return Qnil; /* When we kill an ordinary buffer which shares its buffer text with indirect buffer(s), we must kill indirect buffer(s) too. We do it at this stage so nothing terrible happens if they ask questions or their hooks get errors. */ if (!b->base_buffer && b->indirections > 0) { Lisp_Object tail, other; FOR_EACH_LIVE_BUFFER (tail, other) if (XBUFFER (other)->base_buffer == b) Fkill_buffer (other); /* Exit if we now have killed the base buffer (Bug#11665). */ if (!BUFFER_LIVE_P (b)) return Qt; } /* Run replace_buffer_in_windows before making another buffer current since set-window-buffer-start-and-point will refuse to make another buffer current if the selected window does not show the current buffer (bug#10114). */ replace_buffer_in_windows (buffer); /* Exit if replacing the buffer in windows has killed our buffer. */ if (!BUFFER_LIVE_P (b)) return Qt; /* Make this buffer not be current. Exit if it is the sole visible buffer. */ if (b == current_buffer) { tem = Fother_buffer (buffer, Qnil, Qnil); Fset_buffer (tem); if (b == current_buffer) return Qnil; } /* If the buffer now current is shown in the minibuffer and our buffer is the sole other buffer give up. */ XSETBUFFER (tem, current_buffer); if (EQ (tem, XWINDOW (minibuf_window)->contents) && BASE_EQ (buffer, Fother_buffer (buffer, Qnil, Qnil))) return Qnil; /* Now there is no question: we can kill the buffer. */ /* Unlock this buffer's file, if it is locked. */ unlock_buffer (b); kill_buffer_processes (buffer); kill_buffer_xwidgets (buffer); /* Killing buffer processes may run sentinels which may have killed our buffer. */ if (!BUFFER_LIVE_P (b)) return Qt; /* These may run Lisp code and into infinite loops (if someone insisted on circular lists) so allow quitting here. */ frames_discard_buffer (buffer); clear_charpos_cache (b); tem = Vinhibit_quit; Vinhibit_quit = Qt; /* Once the buffer is removed from Vbuffer_alist, its undo_list field is not traced by the GC in the same way. So set it to nil early. */ bset_undo_list (b, Qnil); /* Remove the buffer from the list of all buffers. */ Vbuffer_alist = Fdelq (Frassq (buffer, Vbuffer_alist), Vbuffer_alist); /* If replace_buffer_in_windows didn't do its job fix that now. */ replace_buffer_in_windows_safely (buffer); Vinhibit_quit = tem; if (b->base_buffer) { INTERVAL i; /* Unchain all markers that belong to this indirect buffer. Don't unchain the markers that belong to the base buffer or its other indirect buffers. */ struct Lisp_Marker **mp = &BUF_MARKERS (b); while ((m = *mp)) { if (m->buffer == b) { m->buffer = NULL; *mp = m->next; } else mp = &m->next; } /* Intervals should be owned by the base buffer (Bug#16502). */ i = buffer_intervals (b); if (i) { Lisp_Object owner; XSETBUFFER (owner, b->base_buffer); set_interval_object (i, owner); } } else { /* Unchain all markers of this buffer and its indirect buffers. and leave them pointing nowhere. */ for (m = BUF_MARKERS (b); m; ) { struct Lisp_Marker *next = m->next; m->buffer = 0; m->next = NULL; m = next; } BUF_MARKERS (b) = NULL; set_buffer_intervals (b, NULL); /* Perhaps we should explicitly free the interval tree here... */ } delete_all_overlays (b); free_buffer_overlays (b); /* Reset the local variables, so that this buffer's local values won't be protected from GC. They would be protected if they happened to remain cached in their symbols. This gets rid of them for certain. */ reset_buffer_local_variables (b, 1); bset_name (b, Qnil); block_input (); if (b->base_buffer) { /* Notify our base buffer that we don't share the text anymore. */ eassert (b->indirections == -1); b->base_buffer->indirections--; eassert (b->base_buffer->indirections >= 0); /* Make sure that we wasn't confused. */ eassert (b->window_count == -1); } else { /* Make sure that no one shows us. */ eassert (b->window_count == 0); /* No one shares our buffer text, can free it. */ free_buffer_text (b); } if (b->newline_cache) { free_region_cache (b->newline_cache); b->newline_cache = 0; } if (b->width_run_cache) { free_region_cache (b->width_run_cache); b->width_run_cache = 0; } if (b->bidi_paragraph_cache) { free_region_cache (b->bidi_paragraph_cache); b->bidi_paragraph_cache = 0; } bset_width_table (b, Qnil); unblock_input (); run_buffer_list_update_hook (b); return Qt; } /* Move association for BUFFER to the front of buffer (a)lists. Since we do this each time BUFFER is selected visibly, the more recently selected buffers are always closer to the front of those lists. This means that other_buffer is more likely to choose a relevant buffer. Note that this moves BUFFER to the front of the buffer lists of the selected frame even if BUFFER is not shown there. If BUFFER is not shown in the selected frame, consider the present behavior a feature. `select-window' gets this right since it shows BUFFER in the selected window when calling us. */ void record_buffer (Lisp_Object buffer) { Lisp_Object aelt, aelt_cons, tem; register struct frame *f = XFRAME (selected_frame); CHECK_BUFFER (buffer); /* Update Vbuffer_alist (we know that it has an entry for BUFFER). Don't allow quitting since this might leave the buffer list in an inconsistent state. */ tem = Vinhibit_quit; Vinhibit_quit = Qt; aelt = Frassq (buffer, Vbuffer_alist); aelt_cons = Fmemq (aelt, Vbuffer_alist); Vbuffer_alist = Fdelq (aelt, Vbuffer_alist); XSETCDR (aelt_cons, Vbuffer_alist); Vbuffer_alist = aelt_cons; Vinhibit_quit = tem; /* Update buffer list of selected frame. */ fset_buffer_list (f, Fcons (buffer, Fdelq (buffer, f->buffer_list))); fset_buried_buffer_list (f, Fdelq (buffer, f->buried_buffer_list)); run_buffer_list_update_hook (XBUFFER (buffer)); } /* Move BUFFER to the end of the buffer (a)lists. Do nothing if the buffer is killed. For the selected frame's buffer list this moves BUFFER to its end even if it was never shown in that frame. If this happens we have a feature, hence `bury-buffer-internal' should be called only when BUFFER was shown in the selected frame. */ DEFUN ("bury-buffer-internal", Fbury_buffer_internal, Sbury_buffer_internal, 1, 1, 0, doc: /* Move BUFFER to the end of the buffer list. */) (Lisp_Object buffer) { Lisp_Object aelt, aelt_cons, tem; register struct frame *f = XFRAME (selected_frame); CHECK_BUFFER (buffer); /* Update Vbuffer_alist (we know that it has an entry for BUFFER). Don't allow quitting since this might leave the buffer list in an inconsistent state. */ tem = Vinhibit_quit; Vinhibit_quit = Qt; aelt = Frassq (buffer, Vbuffer_alist); aelt_cons = Fmemq (aelt, Vbuffer_alist); Vbuffer_alist = Fdelq (aelt, Vbuffer_alist); XSETCDR (aelt_cons, Qnil); Vbuffer_alist = nconc2 (Vbuffer_alist, aelt_cons); Vinhibit_quit = tem; /* Update buffer lists of selected frame. */ fset_buffer_list (f, Fdelq (buffer, f->buffer_list)); fset_buried_buffer_list (f, Fcons (buffer, Fdelq (buffer, f->buried_buffer_list))); run_buffer_list_update_hook (XBUFFER (buffer)); return Qnil; } DEFUN ("set-buffer-major-mode", Fset_buffer_major_mode, Sset_buffer_major_mode, 1, 1, 0, doc: /* Set an appropriate major mode for BUFFER. For the *scratch* buffer, use `initial-major-mode', otherwise choose a mode according to the default value of `major-mode'. Use this function before selecting the buffer, since it may need to inspect the current buffer's major mode. */) (Lisp_Object buffer) { Lisp_Object function; CHECK_BUFFER (buffer); if (!BUFFER_LIVE_P (XBUFFER (buffer))) error ("Attempt to set major mode for a dead buffer"); if (strcmp (SSDATA (BVAR (XBUFFER (buffer), name)), "*scratch*") == 0) function = find_symbol_value (intern ("initial-major-mode")); else { function = BVAR (&buffer_defaults, major_mode); if (NILP (function) && NILP (Fget (BVAR (current_buffer, major_mode), Qmode_class))) function = BVAR (current_buffer, major_mode); } if (NILP (function)) /* If function is `fundamental-mode', allow it to run so that `run-mode-hooks' and thus `hack-local-variables' get run. */ return Qnil; specpdl_ref count = SPECPDL_INDEX (); /* To select a nonfundamental mode, select the buffer temporarily and then call the mode function. */ record_unwind_current_buffer (); Fset_buffer (buffer); call0 (function); return unbind_to (count, Qnil); } DEFUN ("current-buffer", Fcurrent_buffer, Scurrent_buffer, 0, 0, 0, doc: /* Return the current buffer as a Lisp object. */) (void) { register Lisp_Object buf; XSETBUFFER (buf, current_buffer); return buf; } /* Set the current buffer to B, and do not set windows_or_buffers_changed. This is used by redisplay. */ void set_buffer_internal_1 (register struct buffer *b) { #ifdef USE_MMAP_FOR_BUFFERS if (b->text->beg == NULL) enlarge_buffer_text (b, 0); #endif /* USE_MMAP_FOR_BUFFERS */ if (current_buffer == b) return; set_buffer_internal_2 (b); } /* Like set_buffer_internal_1, but doesn't check whether B is already the current buffer. Called upon switch of the current thread, see post_acquire_global_lock. */ void set_buffer_internal_2 (register struct buffer *b) { register struct buffer *old_buf; register Lisp_Object tail; BUFFER_CHECK_INDIRECTION (b); old_buf = current_buffer; current_buffer = b; last_known_column_point = -1; /* Invalidate indentation cache. */ if (old_buf) { /* Put the undo list back in the base buffer, so that it appears that an indirect buffer shares the undo list of its base. */ if (old_buf->base_buffer) bset_undo_list (old_buf->base_buffer, BVAR (old_buf, undo_list)); /* If the old current buffer has markers to record PT, BEGV and ZV when it is not current, update them now. */ record_buffer_markers (old_buf); } /* Get the undo list from the base buffer, so that it appears that an indirect buffer shares the undo list of its base. */ if (b->base_buffer) bset_undo_list (b, BVAR (b->base_buffer, undo_list)); /* If the new current buffer has markers to record PT, BEGV and ZV when it is not current, fetch them now. */ fetch_buffer_markers (b); /* Look down buffer's list of local Lisp variables to find and update any that forward into C variables. */ do { for (tail = BVAR (b, local_var_alist); CONSP (tail); tail = XCDR (tail)) { Lisp_Object var = XCAR (XCAR (tail)); struct Lisp_Symbol *sym = XSYMBOL (var); if (sym->u.s.redirect == SYMBOL_LOCALIZED /* Just to be sure. */ && SYMBOL_BLV (sym)->fwd.fwdptr) /* Just reference the variable to cause it to become set for this buffer. */ Fsymbol_value (var); } } /* Do the same with any others that were local to the previous buffer */ while (b != old_buf && (b = old_buf, b)); } /* Switch to buffer B temporarily for redisplay purposes. This avoids certain things that don't need to be done within redisplay. */ void set_buffer_temp (struct buffer *b) { register struct buffer *old_buf; if (current_buffer == b) return; old_buf = current_buffer; current_buffer = b; /* If the old current buffer has markers to record PT, BEGV and ZV when it is not current, update them now. */ record_buffer_markers (old_buf); /* If the new current buffer has markers to record PT, BEGV and ZV when it is not current, fetch them now. */ fetch_buffer_markers (b); } DEFUN ("set-buffer", Fset_buffer, Sset_buffer, 1, 1, 0, doc: /* Make buffer BUFFER-OR-NAME current for editing operations. BUFFER-OR-NAME may be a buffer or the name of an existing buffer. See also `with-current-buffer' when you want to make a buffer current temporarily. This function does not display the buffer, so its effect ends when the current command terminates. Use `switch-to-buffer' or `pop-to-buffer' to switch buffers permanently. The return value is the buffer made current. */) (register Lisp_Object buffer_or_name) { register Lisp_Object buffer; buffer = Fget_buffer (buffer_or_name); if (NILP (buffer)) nsberror (buffer_or_name); if (!BUFFER_LIVE_P (XBUFFER (buffer))) error ("Selecting deleted buffer"); set_buffer_internal (XBUFFER (buffer)); return buffer; } void restore_buffer (Lisp_Object buffer_or_name) { Fset_buffer (buffer_or_name); } /* Set the current buffer to BUFFER provided if it is alive. */ void set_buffer_if_live (Lisp_Object buffer) { if (BUFFER_LIVE_P (XBUFFER (buffer))) set_buffer_internal (XBUFFER (buffer)); } DEFUN ("barf-if-buffer-read-only", Fbarf_if_buffer_read_only, Sbarf_if_buffer_read_only, 0, 1, 0, doc: /* Signal a `buffer-read-only' error if the current buffer is read-only. If the text under POSITION (which defaults to point) has the `inhibit-read-only' text property set, the error will not be raised. */) (Lisp_Object position) { if (NILP (position)) XSETFASTINT (position, PT); else CHECK_FIXNUM (position); if (!NILP (BVAR (current_buffer, read_only)) && NILP (Vinhibit_read_only) && NILP (Fget_text_property (position, Qinhibit_read_only, Qnil))) xsignal1 (Qbuffer_read_only, Fcurrent_buffer ()); return Qnil; } DEFUN ("erase-buffer", Ferase_buffer, Serase_buffer, 0, 0, "*", doc: /* Delete the entire contents of the current buffer. Any narrowing restriction in effect (see `narrow-to-region') is removed, so the buffer is truly empty after this. */) (void) { Fwiden (); del_range (BEG, Z); current_buffer->last_window_start = 1; /* Prevent warnings, or suspension of auto saving, that would happen if future size is less than past size. Use of erase-buffer implies that the future text is not really related to the past text. */ XSETFASTINT (BVAR (current_buffer, save_length), 0); return Qnil; } void validate_region (Lisp_Object *b, Lisp_Object *e) { EMACS_INT beg = fix_position (*b), end = fix_position (*e); if (end < beg) { EMACS_INT tem = beg; beg = end; end = tem; } if (! (BEGV <= beg && end <= ZV)) args_out_of_range_3 (Fcurrent_buffer (), *b, *e); *b = make_fixnum (beg); *e = make_fixnum (end); } /* Advance BYTE_POS up to a character boundary and return the adjusted position. */ ptrdiff_t advance_to_char_boundary (ptrdiff_t byte_pos) { int c; if (byte_pos == BEG) /* Beginning of buffer is always a character boundary. */ return BEG; c = FETCH_BYTE (byte_pos); if (! CHAR_HEAD_P (c)) { /* We should advance BYTE_POS only when C is a constituent of a multibyte sequence. */ ptrdiff_t orig_byte_pos = byte_pos; do { byte_pos--; c = FETCH_BYTE (byte_pos); } while (! CHAR_HEAD_P (c) && byte_pos > BEG); byte_pos += next_char_len (byte_pos); if (byte_pos < orig_byte_pos) byte_pos = orig_byte_pos; /* If C is a constituent of a multibyte sequence, BYTE_POS was surely advance to the correct character boundary. If C is not, BYTE_POS was unchanged. */ } return byte_pos; } static void swap_buffer_overlays (struct buffer *buffer, struct buffer *other) { struct itree_node *node; ITREE_FOREACH (node, buffer->overlays, PTRDIFF_MIN, PTRDIFF_MAX, ASCENDING) XOVERLAY (node->data)->buffer = other; ITREE_FOREACH (node, other->overlays, PTRDIFF_MIN, PTRDIFF_MAX, ASCENDING) XOVERLAY (node->data)->buffer = buffer; /* Swap the interval trees. */ void *tmp = buffer->overlays; buffer->overlays = other->overlays; other->overlays = tmp; } DEFUN ("buffer-swap-text", Fbuffer_swap_text, Sbuffer_swap_text, 1, 1, 0, doc: /* Swap the text between current buffer and BUFFER. Using this function from `save-excursion' might produce surprising results, see Info node `(elisp)Swapping Text'. */) (Lisp_Object buffer) { struct buffer *other_buffer; CHECK_BUFFER (buffer); other_buffer = XBUFFER (buffer); if (!BUFFER_LIVE_P (other_buffer)) error ("Cannot swap a dead buffer's text"); /* Actually, it probably works just fine. * if (other_buffer == current_buffer) * error ("Cannot swap a buffer's text with itself"); */ /* Actually, this may be workable as well, tho probably only if they're *both* indirect. */ if (other_buffer->base_buffer || current_buffer->base_buffer) error ("Cannot swap indirect buffers's text"); { /* This is probably harder to make work. */ Lisp_Object tail, other; FOR_EACH_LIVE_BUFFER (tail, other) if (XBUFFER (other)->base_buffer == other_buffer || XBUFFER (other)->base_buffer == current_buffer) error ("One of the buffers to swap has indirect buffers"); } #define swapfield(field, type) \ do { \ type tmp##field = other_buffer->field; \ other_buffer->field = current_buffer->field; \ current_buffer->field = tmp##field; \ } while (0) #define swapfield_(field, type) \ do { \ type tmp##field = BVAR (other_buffer, field); \ bset_##field (other_buffer, BVAR (current_buffer, field)); \ bset_##field (current_buffer, tmp##field); \ } while (0) swapfield (own_text, struct buffer_text); eassert (current_buffer->text == ¤t_buffer->own_text); eassert (other_buffer->text == &other_buffer->own_text); #ifdef REL_ALLOC r_alloc_reset_variable ((void **) ¤t_buffer->own_text.beg, (void **) &other_buffer->own_text.beg); r_alloc_reset_variable ((void **) &other_buffer->own_text.beg, (void **) ¤t_buffer->own_text.beg); #endif /* REL_ALLOC */ swapfield (pt, ptrdiff_t); swapfield (pt_byte, ptrdiff_t); swapfield (begv, ptrdiff_t); swapfield (begv_byte, ptrdiff_t); swapfield (zv, ptrdiff_t); swapfield (zv_byte, ptrdiff_t); eassert (!current_buffer->base_buffer); eassert (!other_buffer->base_buffer); swapfield (indirections, ptrdiff_t); current_buffer->clip_changed = 1; other_buffer->clip_changed = 1; swapfield (newline_cache, struct region_cache *); swapfield (width_run_cache, struct region_cache *); swapfield (bidi_paragraph_cache, struct region_cache *); current_buffer->prevent_redisplay_optimizations_p = 1; other_buffer->prevent_redisplay_optimizations_p = 1; swapfield (long_line_optimizations_p, bool_bf); swapfield_ (undo_list, Lisp_Object); swapfield_ (mark, Lisp_Object); swapfield_ (mark_active, Lisp_Object); /* Belongs with the `mark'. */ swapfield_ (enable_multibyte_characters, Lisp_Object); swapfield_ (bidi_display_reordering, Lisp_Object); swapfield_ (bidi_paragraph_direction, Lisp_Object); swapfield_ (bidi_paragraph_separate_re, Lisp_Object); swapfield_ (bidi_paragraph_start_re, Lisp_Object); /* FIXME: Not sure what we should do with these *_marker fields. Hopefully they're just nil anyway. */ swapfield_ (pt_marker, Lisp_Object); swapfield_ (begv_marker, Lisp_Object); swapfield_ (zv_marker, Lisp_Object); bset_point_before_scroll (current_buffer, Qnil); bset_point_before_scroll (other_buffer, Qnil); modiff_incr (¤t_buffer->text->modiff, 1); modiff_incr (&other_buffer->text->modiff, 1); modiff_incr (¤t_buffer->text->chars_modiff, 1); modiff_incr (&other_buffer->text->chars_modiff, 1); modiff_incr (¤t_buffer->text->overlay_modiff, 1); modiff_incr (&other_buffer->text->overlay_modiff, 1); current_buffer->text->beg_unchanged = current_buffer->text->gpt; current_buffer->text->end_unchanged = current_buffer->text->gpt; other_buffer->text->beg_unchanged = other_buffer->text->gpt; other_buffer->text->end_unchanged = other_buffer->text->gpt; swap_buffer_overlays (current_buffer, other_buffer); { struct Lisp_Marker *m; for (m = BUF_MARKERS (current_buffer); m; m = m->next) if (m->buffer == other_buffer) m->buffer = current_buffer; else /* Since there's no indirect buffer in sight, markers on BUF_MARKERS(buf) should either be for `buf' or dead. */ eassert (!m->buffer); for (m = BUF_MARKERS (other_buffer); m; m = m->next) if (m->buffer == current_buffer) m->buffer = other_buffer; else /* Since there's no indirect buffer in sight, markers on BUF_MARKERS(buf) should either be for `buf' or dead. */ eassert (!m->buffer); } { /* Some of the C code expects that both window markers of a live window points to that window's buffer. So since we just swapped the markers between the two buffers, we need to undo the effect of this swap for window markers. */ Lisp_Object w = selected_window, ws = Qnil; Lisp_Object buf1, buf2; XSETBUFFER (buf1, current_buffer); XSETBUFFER (buf2, other_buffer); while (NILP (Fmemq (w, ws))) { ws = Fcons (w, ws); if (MARKERP (XWINDOW (w)->pointm) && (BASE_EQ (XWINDOW (w)->contents, buf1) || BASE_EQ (XWINDOW (w)->contents, buf2))) Fset_marker (XWINDOW (w)->pointm, make_fixnum (BUF_BEGV (XBUFFER (XWINDOW (w)->contents))), XWINDOW (w)->contents); /* Blindly copied from pointm part. */ if (MARKERP (XWINDOW (w)->old_pointm) && (BASE_EQ (XWINDOW (w)->contents, buf1) || BASE_EQ (XWINDOW (w)->contents, buf2))) Fset_marker (XWINDOW (w)->old_pointm, make_fixnum (BUF_BEGV (XBUFFER (XWINDOW (w)->contents))), XWINDOW (w)->contents); if (MARKERP (XWINDOW (w)->start) && (BASE_EQ (XWINDOW (w)->contents, buf1) || BASE_EQ (XWINDOW (w)->contents, buf2))) Fset_marker (XWINDOW (w)->start, make_fixnum (XBUFFER (XWINDOW (w)->contents)->last_window_start), XWINDOW (w)->contents); w = Fnext_window (w, Qt, Qt); } } if (current_buffer->text->intervals) (eassert (BASE_EQ (current_buffer->text->intervals->up.obj, buffer)), XSETBUFFER (current_buffer->text->intervals->up.obj, current_buffer)); if (other_buffer->text->intervals) (eassert (BASE_EQ (other_buffer->text->intervals->up.obj, Fcurrent_buffer ())), XSETBUFFER (other_buffer->text->intervals->up.obj, other_buffer)); return Qnil; } DEFUN ("set-buffer-multibyte", Fset_buffer_multibyte, Sset_buffer_multibyte, 1, 1, 0, doc: /* Set the multibyte flag of the current buffer to FLAG. If FLAG is t, this makes the buffer a multibyte buffer. If FLAG is nil, this makes the buffer a single-byte buffer. In these cases, the buffer contents remain unchanged as a sequence of bytes but the contents viewed as characters do change. If FLAG is `to', this makes the buffer a multibyte buffer by changing all eight-bit bytes to eight-bit characters. If the multibyte flag was really changed, undo information of the current buffer is cleared. */) (Lisp_Object flag) { struct Lisp_Marker *tail, *markers; Lisp_Object btail, other; ptrdiff_t begv, zv; bool narrowed = (BEG != BEGV || Z != ZV); bool modified_p = !NILP (Fbuffer_modified_p (Qnil)); Lisp_Object old_undo = BVAR (current_buffer, undo_list); if (current_buffer->base_buffer) error ("Cannot do `set-buffer-multibyte' on an indirect buffer"); /* Do nothing if nothing actually changes. */ if (NILP (flag) == NILP (BVAR (current_buffer, enable_multibyte_characters))) return flag; /* Don't record these buffer changes. We will put a special undo entry instead. */ bset_undo_list (current_buffer, Qt); /* If the cached position is for this buffer, clear it out. */ clear_charpos_cache (current_buffer); if (NILP (flag)) begv = BEGV_BYTE, zv = ZV_BYTE; else begv = BEGV, zv = ZV; if (narrowed) error ("Changing multibyteness in a narrowed buffer"); invalidate_buffer_caches (current_buffer, BEGV, ZV); if (NILP (flag)) { ptrdiff_t pos, stop; unsigned char *p; /* Do this first, so it can use CHAR_TO_BYTE to calculate the old correspondences. */ set_intervals_multibyte (false); set_overlays_multibyte (false); bset_enable_multibyte_characters (current_buffer, Qnil); Z = Z_BYTE; BEGV = BEGV_BYTE; ZV = ZV_BYTE; GPT = GPT_BYTE; TEMP_SET_PT_BOTH (PT_BYTE, PT_BYTE); for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next) tail->charpos = tail->bytepos; /* Convert multibyte form of 8-bit characters to unibyte. */ pos = BEG; stop = GPT; p = BEG_ADDR; while (1) { if (pos == stop) { if (pos == Z) break; p = GAP_END_ADDR; stop = Z; } if (ASCII_CHAR_P (*p)) p++, pos++; else if (CHAR_BYTE8_HEAD_P (*p)) { int bytes, c = string_char_and_length (p, &bytes); /* Delete all bytes for this 8-bit character but the last one, and change the last one to the character code. */ bytes--; del_range_2 (pos, pos, pos + bytes, pos + bytes, 0); p = GAP_END_ADDR; *p++ = c; pos++; if (begv > pos) begv -= bytes; if (zv > pos) zv -= bytes; stop = Z; } else { int bytes = BYTES_BY_CHAR_HEAD (*p); p += bytes, pos += bytes; } } } else { ptrdiff_t pt = PT; ptrdiff_t pos, stop; unsigned char *p, *pend; /* Be sure not to have a multibyte sequence striding over the GAP. Ex: We change this: "...abc\302 _GAP_ \241def..." to: "...abc _GAP_ \302\241def..." */ if (EQ (flag, Qt) && GPT_BYTE > 1 && GPT_BYTE < Z_BYTE && ! CHAR_HEAD_P (*(GAP_END_ADDR))) { unsigned char *q = GPT_ADDR - 1; while (! CHAR_HEAD_P (*q) && q > BEG_ADDR) q--; if (LEADING_CODE_P (*q)) { ptrdiff_t new_gpt = GPT_BYTE - (GPT_ADDR - q); move_gap_both (new_gpt, new_gpt); } } /* Make the buffer contents valid as multibyte by converting 8-bit characters to multibyte form. */ pos = BEG; stop = GPT; p = BEG_ADDR; pend = GPT_ADDR; while (1) { int bytes; if (pos == stop) { if (pos == Z) break; p = GAP_END_ADDR; pend = Z_ADDR; stop = Z; } if (ASCII_CHAR_P (*p)) p++, pos++; else if (EQ (flag, Qt) && 0 < (bytes = multibyte_length (p, pend, true, false))) p += bytes, pos += bytes; else { unsigned char tmp[MAX_MULTIBYTE_LENGTH]; int c; c = BYTE8_TO_CHAR (*p); bytes = CHAR_STRING (c, tmp); *p = tmp[0]; TEMP_SET_PT_BOTH (pos + 1, pos + 1); bytes--; insert_1_both ((char *) tmp + 1, bytes, bytes, 1, 0, 0); /* Now the gap is after the just inserted data. */ pos = GPT; p = GAP_END_ADDR; if (pos <= begv) begv += bytes; if (pos <= zv) zv += bytes; if (pos <= pt) pt += bytes; pend = Z_ADDR; stop = Z; } } if (pt != PT) TEMP_SET_PT (pt); /* Do this first, so that chars_in_text asks the right question. set_intervals_multibyte needs it too. */ bset_enable_multibyte_characters (current_buffer, Qt); GPT_BYTE = advance_to_char_boundary (GPT_BYTE); GPT = chars_in_text (BEG_ADDR, GPT_BYTE - BEG_BYTE) + BEG; Z = chars_in_text (GAP_END_ADDR, Z_BYTE - GPT_BYTE) + GPT; BEGV_BYTE = advance_to_char_boundary (BEGV_BYTE); if (BEGV_BYTE > GPT_BYTE) BEGV = chars_in_text (GAP_END_ADDR, BEGV_BYTE - GPT_BYTE) + GPT; else BEGV = chars_in_text (BEG_ADDR, BEGV_BYTE - BEG_BYTE) + BEG; ZV_BYTE = advance_to_char_boundary (ZV_BYTE); if (ZV_BYTE > GPT_BYTE) ZV = chars_in_text (GAP_END_ADDR, ZV_BYTE - GPT_BYTE) + GPT; else ZV = chars_in_text (BEG_ADDR, ZV_BYTE - BEG_BYTE) + BEG; { ptrdiff_t byte = advance_to_char_boundary (PT_BYTE); ptrdiff_t position; if (byte > GPT_BYTE) position = chars_in_text (GAP_END_ADDR, byte - GPT_BYTE) + GPT; else position = chars_in_text (BEG_ADDR, byte - BEG_BYTE) + BEG; TEMP_SET_PT_BOTH (position, byte); } tail = markers = BUF_MARKERS (current_buffer); /* This prevents BYTE_TO_CHAR (that is, buf_bytepos_to_charpos) from getting confused by the markers that have not yet been updated. It is also a signal that it should never create a marker. */ BUF_MARKERS (current_buffer) = NULL; for (; tail; tail = tail->next) { tail->bytepos = advance_to_char_boundary (tail->bytepos); tail->charpos = BYTE_TO_CHAR (tail->bytepos); } /* Make sure no markers were put on the chain while the chain value was incorrect. */ if (BUF_MARKERS (current_buffer)) emacs_abort (); BUF_MARKERS (current_buffer) = markers; /* Do this last, so it can calculate the new correspondences between chars and bytes. */ /* FIXME: Is it worth the trouble, really? Couldn't we just throw away all the text-properties instead of trying to guess how to adjust them? AFAICT the result is not reliable anyway. */ set_intervals_multibyte (true); set_overlays_multibyte (true); } if (!EQ (old_undo, Qt)) { /* Represent all the above changes by a special undo entry. */ bset_undo_list (current_buffer, Fcons (list3 (Qapply, intern ("set-buffer-multibyte"), NILP (flag) ? Qt : Qnil), old_undo)); } current_buffer->prevent_redisplay_optimizations_p = 1; /* If buffer is shown in a window, let redisplay consider other windows. */ if (buffer_window_count (current_buffer)) windows_or_buffers_changed = 10; /* Copy this buffer's new multibyte status into all of its indirect buffers. */ FOR_EACH_LIVE_BUFFER (btail, other) { struct buffer *o = XBUFFER (other); if (o->base_buffer == current_buffer && BUFFER_LIVE_P (o)) { BVAR (o, enable_multibyte_characters) = BVAR (current_buffer, enable_multibyte_characters); o->prevent_redisplay_optimizations_p = true; } } /* Restore the modifiedness of the buffer. */ if (!modified_p && !NILP (Fbuffer_modified_p (Qnil))) Fset_buffer_modified_p (Qnil); /* Update coding systems of this buffer's process (if any). */ { Lisp_Object process; process = Fget_buffer_process (Fcurrent_buffer ()); if (PROCESSP (process)) setup_process_coding_systems (process); } return flag; } DEFUN ("kill-all-local-variables", Fkill_all_local_variables, Skill_all_local_variables, 0, 1, 0, doc: /* Switch to Fundamental mode by killing current buffer's local variables. Most local variable bindings are eliminated so that the default values become effective once more. Also, the syntax table is set from `standard-syntax-table', the local keymap is set to nil, and the abbrev table from `fundamental-mode-abbrev-table'. This function also forces redisplay of the mode line. Every function to select a new major mode starts by calling this function. As a special exception, local variables whose names have a non-nil `permanent-local' property are not eliminated by this function. If the optional KILL-PERMANENT argument is non-nil, clear out these local variables, too. The first thing this function does is run the normal hook `change-major-mode-hook'. */) (Lisp_Object kill_permanent) { run_hook (Qchange_major_mode_hook); /* Actually eliminate all local bindings of this buffer. */ reset_buffer_local_variables (current_buffer, !NILP (kill_permanent)); /* Force mode-line redisplay. Useful here because all major mode commands call this function. */ bset_update_mode_line (current_buffer); return Qnil; } /* Find all the overlays in the current buffer that overlap the range [BEG, END). If EMPTY is true, include empty overlays in that range and also at END, provided END denotes the position at the end of the accessible part of the buffer. If TRAILING is true, include overlays that begin at END, provided END denotes the position at the end of the accessible part of the buffer. Return the number found, and store them in a vector in *VEC_PTR. Store in *LEN_PTR the size allocated for the vector. Store in *NEXT_PTR the next position after POS where an overlay starts, or ZV if there are no more overlays. NEXT_PTR may be 0, meaning don't store that info. *VEC_PTR and *LEN_PTR should contain a valid vector and size when this function is called. If EXTEND, make the vector bigger if necessary. If not, never extend the vector, and store only as many overlays as will fit. But still return the total number of overlays. */ ptrdiff_t overlays_in (ptrdiff_t beg, ptrdiff_t end, bool extend, Lisp_Object **vec_ptr, ptrdiff_t *len_ptr, bool empty, bool trailing, ptrdiff_t *next_ptr) { ptrdiff_t idx = 0; ptrdiff_t len = *len_ptr; ptrdiff_t next = ZV; Lisp_Object *vec = *vec_ptr; struct itree_node *node; /* Extend the search range if overlays beginning at ZV are wanted. */ ptrdiff_t search_end = ZV; if (end >= ZV && (empty || trailing)) ++search_end; ITREE_FOREACH (node, current_buffer->overlays, beg, search_end, ASCENDING) { if (node->begin > end) { next = min (next, node->begin); break; } else if (node->begin == end) { next = node->begin; if ((! empty || end < ZV) && beg < end) break; if (empty && node->begin != node->end) continue; } if (! empty && node->begin == node->end) continue; if (extend && idx == len) { vec = xpalloc (vec, len_ptr, 1, OVERLAY_COUNT_MAX, sizeof *vec); *vec_ptr = vec; len = *len_ptr; } if (idx < len) vec[idx] = node->data; /* Keep counting overlays even if we can't return them all. */ idx++; } if (next_ptr) *next_ptr = next ? next : ZV; return idx; } /* Find all non-empty overlays in the current buffer that contain position POS. See overlays_in for the meaning of the arguments. */ ptrdiff_t overlays_at (ptrdiff_t pos, bool extend, Lisp_Object **vec_ptr, ptrdiff_t *len_ptr, ptrdiff_t *next_ptr) { return overlays_in (pos, pos + 1, extend, vec_ptr, len_ptr, false, true, next_ptr); } ptrdiff_t next_overlay_change (ptrdiff_t pos) { ptrdiff_t next = ZV; struct itree_node *node; ITREE_FOREACH (node, current_buffer->overlays, pos, next, ASCENDING) { if (node->begin > pos) { /* If we reach this branch, node->begin must be the least upper bound of pos, because the search is limited to [pos,next) . */ eassert (node->begin < next); next = node->begin; break; } else if (node->begin < node->end && node->end < next) { next = node->end; ITREE_FOREACH_NARROW (pos, next); } } return next; } ptrdiff_t previous_overlay_change (ptrdiff_t pos) { struct itree_node *node; ptrdiff_t prev = BEGV; ITREE_FOREACH (node, current_buffer->overlays, prev, pos, DESCENDING) { if (node->end < pos) prev = node->end; else prev = max (prev, node->begin); ITREE_FOREACH_NARROW (prev, pos); } return prev; } /* Return true if there exists an overlay with a non-nil `mouse-face' property overlapping OVERLAY. */ bool mouse_face_overlay_overlaps (Lisp_Object overlay) { ptrdiff_t start = OVERLAY_START (overlay); ptrdiff_t end = OVERLAY_END (overlay); ptrdiff_t n, i, size; Lisp_Object *v, tem; Lisp_Object vbuf[10]; USE_SAFE_ALLOCA; size = ARRAYELTS (vbuf); v = vbuf; n = overlays_in (start, end, 0, &v, &size, true, false, NULL); if (n > size) { SAFE_NALLOCA (v, 1, n); overlays_in (start, end, 0, &v, &n, true, false, NULL); } for (i = 0; i < n; ++i) if (!EQ (v[i], overlay) && (tem = Foverlay_get (overlay, Qmouse_face), !NILP (tem))) break; SAFE_FREE (); return i < n; } /* Return the value of the 'display-line-numbers-disable' property at EOB, if there's an overlay at ZV with a non-nil value of that property. */ Lisp_Object disable_line_numbers_overlay_at_eob (void) { ptrdiff_t n, i, size; Lisp_Object *v, tem = Qnil; Lisp_Object vbuf[10]; USE_SAFE_ALLOCA; size = ARRAYELTS (vbuf); v = vbuf; n = overlays_in (ZV, ZV, 0, &v, &size, false, false, NULL); if (n > size) { SAFE_NALLOCA (v, 1, n); overlays_in (ZV, ZV, 0, &v, &n, false, false, NULL); } for (i = 0; i < n; ++i) if ((tem = Foverlay_get (v[i], Qdisplay_line_numbers_disable), !NILP (tem))) break; SAFE_FREE (); return tem; } /* Fast function to just test if we're at an overlay boundary. Returns true if some overlay starts or ends (or both) at POS, */ bool overlay_touches_p (ptrdiff_t pos) { struct itree_node *node; /* We need to find overlays ending in pos, as well as empty ones at pos. */ ITREE_FOREACH (node, current_buffer->overlays, pos - 1, pos + 1, DESCENDING) if (node->begin == pos || node->end == pos) return true; return false; } int compare_overlays (const void *v1, const void *v2) { const struct sortvec *s1 = v1; const struct sortvec *s2 = v2; /* Return 1 if s1 should take precedence, -1 if v2 should take precedence, and 0 if they're equal. */ if (s1->priority != s2->priority) return s1->priority < s2->priority ? -1 : 1; /* If the priority is equal, give precedence to the one not covered by the other. If neither covers the other, obey spriority. */ else if (s1->beg < s2->beg) return (s1->end < s2->end && s1->spriority > s2->spriority ? 1 : -1); else if (s1->beg > s2->beg) return (s1->end > s2->end && s1->spriority < s2->spriority ? -1 : 1); else if (s1->end != s2->end) return s2->end < s1->end ? -1 : 1; else if (s1->spriority != s2->spriority) return (s1->spriority < s2->spriority ? -1 : 1); else if (EQ (s1->overlay, s2->overlay)) return 0; else /* Avoid the non-determinism of qsort by choosing an arbitrary ordering between "equal" overlays. The result can still change between invocations of Emacs, but it won't change in the middle of `find_field' (bug#6830). */ return XLI (s1->overlay) < XLI (s2->overlay) ? -1 : 1; } void make_sortvec_item (struct sortvec *item, Lisp_Object overlay) { Lisp_Object tem; /* This overlay is good and counts: put it into sortvec. */ item->overlay = overlay; item->beg = OVERLAY_START (overlay); item->end = OVERLAY_END (overlay); tem = Foverlay_get (overlay, Qpriority); if (NILP (tem)) { item->priority = 0; item->spriority = 0; } else if (FIXNUMP (tem)) { item->priority = XFIXNUM (tem); item->spriority = 0; } else if (CONSP (tem)) { Lisp_Object car = XCAR (tem); Lisp_Object cdr = XCDR (tem); item->priority = FIXNUMP (car) ? XFIXNUM (car) : 0; item->spriority = FIXNUMP (cdr) ? XFIXNUM (cdr) : 0; } } /* Sort an array of overlays by priority. The array is modified in place. The return value is the new size; this may be smaller than the original size if some of the overlays were invalid or were window-specific. */ ptrdiff_t sort_overlays (Lisp_Object *overlay_vec, ptrdiff_t noverlays, struct window *w) { ptrdiff_t i, j; USE_SAFE_ALLOCA; struct sortvec *sortvec; SAFE_NALLOCA (sortvec, 1, noverlays); /* Put the valid and relevant overlays into sortvec. */ for (i = 0, j = 0; i < noverlays; i++) { Lisp_Object overlay; overlay = overlay_vec[i]; if (OVERLAYP (overlay) && OVERLAY_START (overlay) > 0 && OVERLAY_END (overlay) > 0) { /* If we're interested in a specific window, then ignore overlays that are limited to some other window. */ if (w && ! overlay_matches_window (w, overlay)) continue; make_sortvec_item (sortvec + j, overlay); j++; } } noverlays = j; /* Sort the overlays into the proper order: increasing priority. */ if (noverlays > 1) qsort (sortvec, noverlays, sizeof (struct sortvec), compare_overlays); for (i = 0; i < noverlays; i++) overlay_vec[i] = sortvec[i].overlay; SAFE_FREE (); return (noverlays); } struct sortstr { Lisp_Object string, string2; ptrdiff_t size; EMACS_INT priority; }; struct sortstrlist { struct sortstr *buf; /* An array that expands as needed; never freed. */ ptrdiff_t size; /* Allocated length of that array. */ ptrdiff_t used; /* How much of the array is currently in use. */ ptrdiff_t bytes; /* Total length of the strings in buf. */ }; /* Buffers for storing information about the overlays touching a given position. These could be automatic variables in overlay_strings, but it's more efficient to hold onto the memory instead of repeatedly allocating and freeing it. */ static struct sortstrlist overlay_heads, overlay_tails; static unsigned char *overlay_str_buf; /* Allocated length of overlay_str_buf. */ static ptrdiff_t overlay_str_len; /* A comparison function suitable for passing to qsort. */ static int cmp_for_strings (const void *as1, const void *as2) { struct sortstr const *s1 = as1; struct sortstr const *s2 = as2; if (s1->size != s2->size) return s2->size < s1->size ? -1 : 1; if (s1->priority != s2->priority) return s1->priority < s2->priority ? -1 : 1; return 0; } static void record_overlay_string (struct sortstrlist *ssl, Lisp_Object str, Lisp_Object str2, Lisp_Object pri, ptrdiff_t size) { ptrdiff_t nbytes; if (ssl->used == ssl->size) ssl->buf = xpalloc (ssl->buf, &ssl->size, 5, -1, sizeof *ssl->buf); ssl->buf[ssl->used].string = str; ssl->buf[ssl->used].string2 = str2; ssl->buf[ssl->used].size = size; ssl->buf[ssl->used].priority = (FIXNUMP (pri) ? XFIXNUM (pri) : 0); ssl->used++; if (NILP (BVAR (current_buffer, enable_multibyte_characters))) nbytes = SCHARS (str); else if (! STRING_MULTIBYTE (str)) nbytes = count_size_as_multibyte (SDATA (str), SBYTES (str)); else nbytes = SBYTES (str); if (INT_ADD_WRAPV (ssl->bytes, nbytes, &nbytes)) memory_full (SIZE_MAX); ssl->bytes = nbytes; if (STRINGP (str2)) { if (NILP (BVAR (current_buffer, enable_multibyte_characters))) nbytes = SCHARS (str2); else if (! STRING_MULTIBYTE (str2)) nbytes = count_size_as_multibyte (SDATA (str2), SBYTES (str2)); else nbytes = SBYTES (str2); if (INT_ADD_WRAPV (ssl->bytes, nbytes, &nbytes)) memory_full (SIZE_MAX); ssl->bytes = nbytes; } } /* Concatenate the strings associated with overlays that begin or end at POS, ignoring overlays that are specific to windows other than W. The strings are concatenated in the appropriate order: shorter overlays nest inside longer ones, and higher priority inside lower. Normally all of the after-strings come first, but zero-sized overlays have their after-strings ride along with the before-strings because it would look strange to print them inside-out. Returns the concatenated string's length, and return the pointer to that string via PSTR, if that variable is non-NULL. The storage of the concatenated strings may be overwritten by subsequent calls. */ ptrdiff_t overlay_strings (ptrdiff_t pos, struct window *w, unsigned char **pstr) { bool multibyte = ! NILP (BVAR (current_buffer, enable_multibyte_characters)); struct itree_node *node; overlay_heads.used = overlay_heads.bytes = 0; overlay_tails.used = overlay_tails.bytes = 0; ITREE_FOREACH (node, current_buffer->overlays, pos - 1, pos + 1, DESCENDING) { Lisp_Object overlay = node->data; eassert (OVERLAYP (overlay)); ptrdiff_t startpos = node->begin; ptrdiff_t endpos = node->end; if (endpos != pos && startpos != pos) continue; Lisp_Object window = Foverlay_get (overlay, Qwindow); if (WINDOWP (window) && XWINDOW (window) != w) continue; Lisp_Object str; /* FIXME: Are we really sure that `record_overlay_string` can never cause a non-local exit? */ if (startpos == pos && (str = Foverlay_get (overlay, Qbefore_string), STRINGP (str))) record_overlay_string (&overlay_heads, str, (startpos == endpos ? Foverlay_get (overlay, Qafter_string) : Qnil), Foverlay_get (overlay, Qpriority), endpos - startpos); else if (endpos == pos && (str = Foverlay_get (overlay, Qafter_string), STRINGP (str))) record_overlay_string (&overlay_tails, str, Qnil, Foverlay_get (overlay, Qpriority), endpos - startpos); } if (overlay_tails.used > 1) qsort (overlay_tails.buf, overlay_tails.used, sizeof (struct sortstr), cmp_for_strings); if (overlay_heads.used > 1) qsort (overlay_heads.buf, overlay_heads.used, sizeof (struct sortstr), cmp_for_strings); if (overlay_heads.bytes || overlay_tails.bytes) { Lisp_Object tem; ptrdiff_t i; unsigned char *p; ptrdiff_t total; if (INT_ADD_WRAPV (overlay_heads.bytes, overlay_tails.bytes, &total)) memory_full (SIZE_MAX); if (total > overlay_str_len) overlay_str_buf = xpalloc (overlay_str_buf, &overlay_str_len, total - overlay_str_len, -1, 1); p = overlay_str_buf; for (i = overlay_tails.used; --i >= 0;) { ptrdiff_t nbytes; tem = overlay_tails.buf[i].string; nbytes = copy_text (SDATA (tem), p, SBYTES (tem), STRING_MULTIBYTE (tem), multibyte); p += nbytes; } for (i = 0; i < overlay_heads.used; ++i) { ptrdiff_t nbytes; tem = overlay_heads.buf[i].string; nbytes = copy_text (SDATA (tem), p, SBYTES (tem), STRING_MULTIBYTE (tem), multibyte); p += nbytes; tem = overlay_heads.buf[i].string2; if (STRINGP (tem)) { nbytes = copy_text (SDATA (tem), p, SBYTES (tem), STRING_MULTIBYTE (tem), multibyte); p += nbytes; } } if (p != overlay_str_buf + total) emacs_abort (); if (pstr) *pstr = overlay_str_buf; return total; } return 0; } void adjust_overlays_for_insert (ptrdiff_t pos, ptrdiff_t length, bool before_markers) { if (!current_buffer->indirections) itree_insert_gap (current_buffer->overlays, pos, length, before_markers); else { struct buffer *base = current_buffer->base_buffer ? current_buffer->base_buffer : current_buffer; Lisp_Object tail, other; itree_insert_gap (base->overlays, pos, length, before_markers); FOR_EACH_LIVE_BUFFER (tail, other) if (XBUFFER (other)->base_buffer == base) itree_insert_gap (XBUFFER (other)->overlays, pos, length, before_markers); } } static void adjust_overlays_for_delete_in_buffer (struct buffer * buf, ptrdiff_t pos, ptrdiff_t length) { Lisp_Object hit_list = Qnil; struct itree_node *node; /* Ideally, the evaporate check would be done directly within `itree_delete_gap`, but that code isn't supposed to know about overlays, only about `itree_node`s, so it would break an abstraction boundary. */ itree_delete_gap (buf->overlays, pos, length); /* Delete any zero-sized overlays at position POS, if the `evaporate' property is set. */ ITREE_FOREACH (node, buf->overlays, pos, pos, ASCENDING) { if (node->end == pos && node->begin == pos && ! NILP (Foverlay_get (node->data, Qevaporate))) hit_list = Fcons (node->data, hit_list); } for (; CONSP (hit_list); hit_list = XCDR (hit_list)) Fdelete_overlay (XCAR (hit_list)); } void adjust_overlays_for_delete (ptrdiff_t pos, ptrdiff_t length) { if (!current_buffer->indirections) adjust_overlays_for_delete_in_buffer (current_buffer, pos, length); else { struct buffer *base = current_buffer->base_buffer ? current_buffer->base_buffer : current_buffer; Lisp_Object tail, other; adjust_overlays_for_delete_in_buffer (base, pos, length); FOR_EACH_LIVE_BUFFER (tail, other) if (XBUFFER (other)->base_buffer == base) adjust_overlays_for_delete_in_buffer (XBUFFER (other), pos, length); } } DEFUN ("overlayp", Foverlayp, Soverlayp, 1, 1, 0, doc: /* Return t if OBJECT is an overlay. */) (Lisp_Object object) { return (OVERLAYP (object) ? Qt : Qnil); } DEFUN ("make-overlay", Fmake_overlay, Smake_overlay, 2, 5, 0, doc: /* Create a new overlay with range BEG to END in BUFFER and return it. If omitted, BUFFER defaults to the current buffer. BEG and END may be integers or markers. The fourth arg FRONT-ADVANCE, if non-nil, makes the marker for the front of the overlay advance when text is inserted there \(which means the text *is not* included in the overlay). The fifth arg REAR-ADVANCE, if non-nil, makes the marker for the rear of the overlay advance when text is inserted there \(which means the text *is* included in the overlay). */) (Lisp_Object beg, Lisp_Object end, Lisp_Object buffer, Lisp_Object front_advance, Lisp_Object rear_advance) { Lisp_Object ov; struct buffer *b; if (NILP (buffer)) XSETBUFFER (buffer, current_buffer); else CHECK_BUFFER (buffer); b = XBUFFER (buffer); if (! BUFFER_LIVE_P (b)) error ("Attempt to create overlay in a dead buffer"); if (MARKERP (beg) && !BASE_EQ (Fmarker_buffer (beg), buffer)) signal_error ("Marker points into wrong buffer", beg); if (MARKERP (end) && !BASE_EQ (Fmarker_buffer (end), buffer)) signal_error ("Marker points into wrong buffer", end); CHECK_FIXNUM_COERCE_MARKER (beg); CHECK_FIXNUM_COERCE_MARKER (end); if (XFIXNUM (beg) > XFIXNUM (end)) { Lisp_Object temp; temp = beg; beg = end; end = temp; } ptrdiff_t obeg = clip_to_bounds (BUF_BEG (b), XFIXNUM (beg), BUF_Z (b)); ptrdiff_t oend = clip_to_bounds (obeg, XFIXNUM (end), BUF_Z (b)); ov = build_overlay (! NILP (front_advance), ! NILP (rear_advance), Qnil); add_buffer_overlay (b, XOVERLAY (ov), obeg, oend); /* We don't need to redisplay the region covered by the overlay, because the overlay has no properties at the moment. */ return ov; } /* Mark a section of BUF as needing redisplay because of overlays changes. */ static void modify_overlay (struct buffer *buf, ptrdiff_t start, ptrdiff_t end) { if (start > end) { ptrdiff_t temp = start; start = end; end = temp; } BUF_COMPUTE_UNCHANGED (buf, start, end); bset_redisplay (buf); modiff_incr (&BUF_OVERLAY_MODIFF (buf), 1); } DEFUN ("move-overlay", Fmove_overlay, Smove_overlay, 3, 4, 0, doc: /* Set the endpoints of OVERLAY to BEG and END in BUFFER. If BUFFER is omitted, leave OVERLAY in the same buffer it inhabits now. If BUFFER is omitted, and OVERLAY is in no buffer, put it in the current buffer. */) (Lisp_Object overlay, Lisp_Object beg, Lisp_Object end, Lisp_Object buffer) { struct buffer *b, *ob = 0; Lisp_Object obuffer; specpdl_ref count = SPECPDL_INDEX (); ptrdiff_t o_beg UNINIT, o_end UNINIT; CHECK_OVERLAY (overlay); if (NILP (buffer)) buffer = Foverlay_buffer (overlay); if (NILP (buffer)) XSETBUFFER (buffer, current_buffer); CHECK_BUFFER (buffer); if (NILP (Fbuffer_live_p (buffer))) error ("Attempt to move overlay to a dead buffer"); if (MARKERP (beg) && !BASE_EQ (Fmarker_buffer (beg), buffer)) signal_error ("Marker points into wrong buffer", beg); if (MARKERP (end) && !BASE_EQ (Fmarker_buffer (end), buffer)) signal_error ("Marker points into wrong buffer", end); CHECK_FIXNUM_COERCE_MARKER (beg); CHECK_FIXNUM_COERCE_MARKER (end); if (XFIXNUM (beg) > XFIXNUM (end)) { Lisp_Object temp; temp = beg; beg = end; end = temp; } specbind (Qinhibit_quit, Qt); /* FIXME: Why? */ obuffer = Foverlay_buffer (overlay); b = XBUFFER (buffer); ptrdiff_t n_beg = clip_to_bounds (BUF_BEG (b), XFIXNUM (beg), BUF_Z (b)); ptrdiff_t n_end = clip_to_bounds (n_beg, XFIXNUM (end), BUF_Z (b)); if (!NILP (obuffer)) { ob = XBUFFER (obuffer); o_beg = OVERLAY_START (overlay); o_end = OVERLAY_END (overlay); } if (! BASE_EQ (buffer, obuffer)) { if (! NILP (obuffer)) remove_buffer_overlay (XBUFFER (obuffer), XOVERLAY (overlay)); add_buffer_overlay (XBUFFER (buffer), XOVERLAY (overlay), n_beg, n_end); } else itree_node_set_region (b->overlays, XOVERLAY (overlay)->interval, n_beg, n_end); /* If the overlay has changed buffers, do a thorough redisplay. */ if (!BASE_EQ (buffer, obuffer)) { /* Redisplay where the overlay was. */ if (ob) modify_overlay (ob, o_beg, o_end); /* Redisplay where the overlay is going to be. */ modify_overlay (b, n_beg, n_end); } else /* Redisplay the area the overlay has just left, or just enclosed. */ { if (o_beg == n_beg) modify_overlay (b, o_end, n_end); else if (o_end == n_end) modify_overlay (b, o_beg, n_beg); else modify_overlay (b, min (o_beg, n_beg), max (o_end, n_end)); } /* Delete the overlay if it is empty after clipping and has the evaporate property. */ if (n_beg == n_end && !NILP (Foverlay_get (overlay, Qevaporate))) { /* We used to call `Fdelete_overlay' here, but it causes problems: - At this stage, `overlay' is not included in its buffer's lists of overlays (the data-structure is in an inconsistent state), contrary to `Fdelete_overlay's assumptions. - Most of the work done by Fdelete_overlay has already been done here for other reasons. */ drop_overlay (XOVERLAY (overlay)); return unbind_to (count, overlay); } return unbind_to (count, overlay); } DEFUN ("delete-overlay", Fdelete_overlay, Sdelete_overlay, 1, 1, 0, doc: /* Delete the overlay OVERLAY from its buffer. */) (Lisp_Object overlay) { struct buffer *b; specpdl_ref count = SPECPDL_INDEX (); CHECK_OVERLAY (overlay); b = OVERLAY_BUFFER (overlay); if (! b) return Qnil; specbind (Qinhibit_quit, Qt); drop_overlay (XOVERLAY (overlay)); /* When deleting an overlay with before or after strings, turn off display optimizations for the affected buffer, on the basis that these strings may contain newlines. This is easier to do than to check for that situation during redisplay. */ if (!windows_or_buffers_changed && (!NILP (Foverlay_get (overlay, Qbefore_string)) || !NILP (Foverlay_get (overlay, Qafter_string)))) b->prevent_redisplay_optimizations_p = 1; return unbind_to (count, Qnil); } DEFUN ("delete-all-overlays", Fdelete_all_overlays, Sdelete_all_overlays, 0, 1, 0, doc: /* Delete all overlays of BUFFER. BUFFER omitted or nil means delete all overlays of the current buffer. */) (Lisp_Object buffer) { delete_all_overlays (decode_buffer (buffer)); return Qnil; } /* Overlay dissection functions. */ DEFUN ("overlay-start", Foverlay_start, Soverlay_start, 1, 1, 0, doc: /* Return the position at which OVERLAY starts. */) (Lisp_Object overlay) { CHECK_OVERLAY (overlay); if (! OVERLAY_BUFFER (overlay)) return Qnil; return make_fixnum (OVERLAY_START (overlay)); } DEFUN ("overlay-end", Foverlay_end, Soverlay_end, 1, 1, 0, doc: /* Return the position at which OVERLAY ends. */) (Lisp_Object overlay) { CHECK_OVERLAY (overlay); if (! OVERLAY_BUFFER (overlay)) return Qnil; return make_fixnum (OVERLAY_END (overlay)); } DEFUN ("overlay-buffer", Foverlay_buffer, Soverlay_buffer, 1, 1, 0, doc: /* Return the buffer OVERLAY belongs to. Return nil if OVERLAY has been deleted. */) (Lisp_Object overlay) { Lisp_Object buffer; CHECK_OVERLAY (overlay); if (! OVERLAY_BUFFER (overlay)) return Qnil; XSETBUFFER (buffer, OVERLAY_BUFFER (overlay)); return buffer; } DEFUN ("overlay-properties", Foverlay_properties, Soverlay_properties, 1, 1, 0, doc: /* Return a list of the properties on OVERLAY. This is a copy of OVERLAY's plist; modifying its conses has no effect on OVERLAY. */) (Lisp_Object overlay) { CHECK_OVERLAY (overlay); return Fcopy_sequence (OVERLAY_PLIST (overlay)); } DEFUN ("overlays-at", Foverlays_at, Soverlays_at, 1, 2, 0, doc: /* Return a list of the overlays that contain the character at POS. If SORTED is non-nil, then sort them by decreasing priority. Zero-length overlays that start and stop at POS are not included in the return value. Instead use `overlays-in' if those overlays are of interest. */) (Lisp_Object pos, Lisp_Object sorted) { ptrdiff_t len, noverlays; Lisp_Object *overlay_vec; Lisp_Object result; CHECK_FIXNUM_COERCE_MARKER (pos); if (!buffer_has_overlays ()) return Qnil; len = 10; /* We can't use alloca here because overlays_at can call xrealloc. */ overlay_vec = xmalloc (len * sizeof *overlay_vec); /* Put all the overlays we want in a vector in overlay_vec. Store the length in len. */ noverlays = overlays_at (XFIXNUM (pos), true, &overlay_vec, &len, NULL); if (!NILP (sorted)) noverlays = sort_overlays (overlay_vec, noverlays, WINDOWP (sorted) ? XWINDOW (sorted) : NULL); /* Make a list of them all. */ result = Flist (noverlays, overlay_vec); /* The doc string says the list should be in decreasing order of priority, so we reverse the list, because sort_overlays sorts in the increasing order of priority. */ if (!NILP (sorted)) result = Fnreverse (result); xfree (overlay_vec); return result; } DEFUN ("overlays-in", Foverlays_in, Soverlays_in, 2, 2, 0, doc: /* Return a list of the overlays that overlap the region BEG ... END. Overlap means that at least one character is contained within the overlay and also contained within the specified region. Empty overlays are included in the result if they are located at BEG, between BEG and END, or at END provided END denotes the position at the end of the accessible part of the buffer. The resulting list of overlays is in an arbitrary unpredictable order. */) (Lisp_Object beg, Lisp_Object end) { ptrdiff_t len, noverlays; Lisp_Object *overlay_vec; Lisp_Object result; CHECK_FIXNUM_COERCE_MARKER (beg); CHECK_FIXNUM_COERCE_MARKER (end); if (!buffer_has_overlays ()) return Qnil; len = 10; overlay_vec = xmalloc (len * sizeof *overlay_vec); /* Put all the overlays we want in a vector in overlay_vec. Store the length in len. */ noverlays = overlays_in (XFIXNUM (beg), XFIXNUM (end), 1, &overlay_vec, &len, true, false, NULL); /* Make a list of them all. */ result = Flist (noverlays, overlay_vec); xfree (overlay_vec); return result; } DEFUN ("next-overlay-change", Fnext_overlay_change, Snext_overlay_change, 1, 1, 0, doc: /* Return the next position after POS where an overlay starts or ends. If there are no overlay boundaries from POS to (point-max), the value is (point-max). */) (Lisp_Object pos) { CHECK_FIXNUM_COERCE_MARKER (pos); if (!buffer_has_overlays ()) return make_fixnum (ZV); return make_fixnum (next_overlay_change (XFIXNUM (pos))); } DEFUN ("previous-overlay-change", Fprevious_overlay_change, Sprevious_overlay_change, 1, 1, 0, doc: /* Return the previous position before POS where an overlay starts or ends. If there are no overlay boundaries from (point-min) to POS, the value is (point-min). */) (Lisp_Object pos) { CHECK_FIXNUM_COERCE_MARKER (pos); if (!buffer_has_overlays ()) return make_fixnum (BEGV); return make_fixnum (previous_overlay_change (XFIXNUM (pos))); } /* These functions are for debugging overlays. */ DEFUN ("overlay-lists", Foverlay_lists, Soverlay_lists, 0, 0, 0, doc: /* Return a pair of lists giving all the overlays of the current buffer. The car has all the overlays before the overlay center; the cdr has all the overlays after the overlay center. Recentering overlays moves overlays between these lists. The lists you get are copies, so that changing them has no effect. However, the overlays you get are the real objects that the buffer uses. */) (void) { Lisp_Object overlays = Qnil; struct itree_node *node; ITREE_FOREACH (node, current_buffer->overlays, BEG, Z, DESCENDING) overlays = Fcons (node->data, overlays); return Fcons (overlays, Qnil); } DEFUN ("overlay-recenter", Foverlay_recenter, Soverlay_recenter, 1, 1, 0, doc: /* Recenter the overlays of the current buffer around position POS. That makes overlay lookup faster for positions near POS (but perhaps slower for positions far away from POS). */) (Lisp_Object pos) { CHECK_FIXNUM_COERCE_MARKER (pos); /* Noop */ return Qnil; } DEFUN ("overlay-get", Foverlay_get, Soverlay_get, 2, 2, 0, doc: /* Get the property of overlay OVERLAY with property name PROP. */) (Lisp_Object overlay, Lisp_Object prop) { CHECK_OVERLAY (overlay); return lookup_char_property (XOVERLAY (overlay)->plist, prop, 0); } DEFUN ("overlay-put", Foverlay_put, Soverlay_put, 3, 3, 0, doc: /* Set one property of overlay OVERLAY: give property PROP value VALUE. VALUE will be returned.*/) (Lisp_Object overlay, Lisp_Object prop, Lisp_Object value) { Lisp_Object tail; struct buffer *b; bool changed; CHECK_OVERLAY (overlay); b = OVERLAY_BUFFER (overlay); for (tail = XOVERLAY (overlay)->plist; CONSP (tail) && CONSP (XCDR (tail)); tail = XCDR (XCDR (tail))) if (EQ (XCAR (tail), prop)) { changed = !EQ (XCAR (XCDR (tail)), value); XSETCAR (XCDR (tail), value); goto found; } /* It wasn't in the list, so add it to the front. */ changed = !NILP (value); set_overlay_plist (overlay, Fcons (prop, Fcons (value, XOVERLAY (overlay)->plist))); found: if (b) { if (changed) modify_overlay (b, OVERLAY_START (overlay), OVERLAY_END (overlay)); if (EQ (prop, Qevaporate) && ! NILP (value) && (OVERLAY_START (overlay) == OVERLAY_END (overlay))) Fdelete_overlay (overlay); } return value; } /* Subroutine of report_overlay_modification. */ /* Lisp vector holding overlay hook functions to call. Vector elements come in pairs. Each even-index element is a list of hook functions. The following odd-index element is the overlay they came from. Before the buffer change, we fill in this vector as we call overlay hook functions. After the buffer change, we get the functions to call from this vector. This way we always call the same functions before and after the change. */ static Lisp_Object last_overlay_modification_hooks; /* Number of elements actually used in last_overlay_modification_hooks. */ static ptrdiff_t last_overlay_modification_hooks_used; /* Add one functionlist/overlay pair to the end of last_overlay_modification_hooks. */ static void add_overlay_mod_hooklist (Lisp_Object functionlist, Lisp_Object overlay) { ptrdiff_t oldsize = ASIZE (last_overlay_modification_hooks); if (oldsize - 1 <= last_overlay_modification_hooks_used) last_overlay_modification_hooks = larger_vector (last_overlay_modification_hooks, 2, -1); ASET (last_overlay_modification_hooks, last_overlay_modification_hooks_used, functionlist); last_overlay_modification_hooks_used++; ASET (last_overlay_modification_hooks, last_overlay_modification_hooks_used, overlay); last_overlay_modification_hooks_used++; } /* Run the modification-hooks of overlays that include any part of the text in START to END. If this change is an insertion, also run the insert-before-hooks of overlay starting at END, and the insert-after-hooks of overlay ending at START. This is called both before and after the modification. AFTER is true when we call after the modification. ARG1, ARG2, ARG3 are arguments to pass to the hook functions. When AFTER is nonzero, they are the start position, the position after the inserted new text, and the length of deleted or replaced old text. */ void report_overlay_modification (Lisp_Object start, Lisp_Object end, bool after, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) { /* True if this change is an insertion. */ bool insertion = (after ? XFIXNAT (arg3) == 0 : EQ (start, end)); /* We used to run the functions as soon as we found them and only register them in last_overlay_modification_hooks for the purpose of the `after' case. But running elisp code as we traverse the list of overlays is painful because the list can be modified by the elisp code so we had to copy at several places. We now simply do a read-only traversal that only collects the functions to run and we run them afterwards. It's simpler, especially since all the code was already there. -stef */ if (!after) { struct itree_node *node; EMACS_INT begin_arg = XFIXNUM (start); EMACS_INT end_arg = XFIXNUM (end); /* We are being called before a change. Scan the overlays to find the functions to call. */ last_overlay_modification_hooks_used = 0; if (! current_buffer->overlays) return; ITREE_FOREACH (node, current_buffer->overlays, begin_arg - (insertion ? 1 : 0), end_arg + (insertion ? 1 : 0), ASCENDING) { Lisp_Object overlay = node->data; ptrdiff_t obegin = OVERLAY_START (overlay); ptrdiff_t oend = OVERLAY_END (overlay); if (insertion && (begin_arg == obegin || end_arg == obegin)) { Lisp_Object prop = Foverlay_get (overlay, Qinsert_in_front_hooks); if (!NILP (prop)) add_overlay_mod_hooklist (prop, overlay); } if (insertion && (begin_arg == oend || end_arg == oend)) { Lisp_Object prop = Foverlay_get (overlay, Qinsert_behind_hooks); if (!NILP (prop)) add_overlay_mod_hooklist (prop, overlay); } /* Test for intersecting intervals. This does the right thing for both insertion and deletion. */ if (! insertion || (end_arg > obegin && begin_arg < oend)) { Lisp_Object prop = Foverlay_get (overlay, Qmodification_hooks); if (!NILP (prop)) add_overlay_mod_hooklist (prop, overlay); } } } { /* Call the functions recorded in last_overlay_modification_hooks. First copy the vector contents, in case some of these hooks do subsequent modification of the buffer. */ ptrdiff_t size = last_overlay_modification_hooks_used; Lisp_Object *copy; ptrdiff_t i; USE_SAFE_ALLOCA; SAFE_ALLOCA_LISP (copy, size); memcpy (copy, XVECTOR (last_overlay_modification_hooks)->contents, size * word_size); for (i = 0; i < size;) { Lisp_Object prop_i, overlay_i; prop_i = copy[i++]; overlay_i = copy[i++]; /* It is possible that the recorded overlay has been deleted (which makes its markers' buffers be nil), or that (due to some bug) it belongs to a different buffer. Only run this hook if the overlay belongs to the current buffer. */ if (OVERLAY_BUFFER (overlay_i) == current_buffer) call_overlay_mod_hooks (prop_i, overlay_i, after, arg1, arg2, arg3); } SAFE_FREE (); } } static void call_overlay_mod_hooks (Lisp_Object list, Lisp_Object overlay, bool after, Lisp_Object arg1, Lisp_Object arg2, Lisp_Object arg3) { while (CONSP (list)) { if (NILP (arg3)) call4 (XCAR (list), overlay, after ? Qt : Qnil, arg1, arg2); else call5 (XCAR (list), overlay, after ? Qt : Qnil, arg1, arg2, arg3); list = XCDR (list); } } /*********************************************************************** Allocation with mmap ***********************************************************************/ /* Note: WINDOWSNT implements this stuff on w32heap.c. */ #if defined USE_MMAP_FOR_BUFFERS && !defined WINDOWSNT #include #ifndef MAP_ANON #ifdef MAP_ANONYMOUS #define MAP_ANON MAP_ANONYMOUS #else #define MAP_ANON 0 #endif #endif #ifndef MAP_FAILED #define MAP_FAILED ((void *) -1) #endif #if MAP_ANON == 0 #include #endif /* Memory is allocated in regions which are mapped using mmap(2). The current implementation lets the system select mapped addresses; we're not using MAP_FIXED in general, except when trying to enlarge regions. Each mapped region starts with a mmap_region structure, the user area starts after that structure, aligned to MEM_ALIGN. +-----------------------+ | struct mmap_info + | | padding | +-----------------------+ | user data | | | | | +-----------------------+ */ struct mmap_region { /* User-specified size. */ size_t nbytes_specified; /* Number of bytes mapped */ size_t nbytes_mapped; /* Pointer to the location holding the address of the memory allocated with the mmap'd block. The variable actually points after this structure. */ void **var; /* Next and previous in list of all mmap'd regions. */ struct mmap_region *next, *prev; }; /* Doubly-linked list of mmap'd regions. */ static struct mmap_region *mmap_regions; /* File descriptor for mmap. If we don't have anonymous mapping, /dev/zero will be opened on it. */ static int mmap_fd; /* Page size on this system. */ static int mmap_page_size; /* 1 means mmap has been initialized. */ static bool mmap_initialized_p; /* Value is X rounded up to the next multiple of N. */ #define ROUND(X, N) (((X) + (N) - 1) / (N) * (N)) /* Size of mmap_region structure plus padding. */ #define MMAP_REGION_STRUCT_SIZE \ ROUND (sizeof (struct mmap_region), MEM_ALIGN) /* Given a pointer P to the start of the user-visible part of a mapped region, return a pointer to the start of the region. */ #define MMAP_REGION(P) \ ((struct mmap_region *) ((char *) (P) - MMAP_REGION_STRUCT_SIZE)) /* Given a pointer P to the start of a mapped region, return a pointer to the start of the user-visible part of the region. */ #define MMAP_USER_AREA(P) \ ((void *) ((char *) (P) + MMAP_REGION_STRUCT_SIZE)) #define MEM_ALIGN sizeof (double) /* Predicate returning true if part of the address range [START .. END] is currently mapped. Used to prevent overwriting an existing memory mapping. Default is to conservatively assume the address range is occupied by something else. This can be overridden by system configuration files if system-specific means to determine this exists. */ #ifndef MMAP_ALLOCATED_P #define MMAP_ALLOCATED_P(start, end) 1 #endif /* Perform necessary initializations for the use of mmap. */ static void mmap_init (void) { #if MAP_ANON == 0 /* The value of mmap_fd is initially 0 in temacs, and -1 in a dumped Emacs. */ if (mmap_fd <= 0) { /* No anonymous mmap -- we need the file descriptor. */ mmap_fd = emacs_open_noquit ("/dev/zero", O_RDONLY, 0); if (mmap_fd == -1) fatal ("Cannot open /dev/zero: %s", emacs_strerror (errno)); } #endif /* MAP_ANON == 0 */ if (mmap_initialized_p) return; mmap_initialized_p = 1; #if MAP_ANON != 0 mmap_fd = -1; #endif mmap_page_size = getpagesize (); } /* Unmap a region. P is a pointer to the start of the user-araa of the region. */ static void mmap_free_1 (struct mmap_region *r) { if (r->next) r->next->prev = r->prev; if (r->prev) r->prev->next = r->next; else mmap_regions = r->next; if (munmap (r, r->nbytes_mapped) == -1) fprintf (stderr, "munmap: %s\n", emacs_strerror (errno)); } /* Enlarge region R by NPAGES pages. NPAGES < 0 means shrink R. Value is true if successful. */ static bool mmap_enlarge (struct mmap_region *r, int npages) { char *region_end = (char *) r + r->nbytes_mapped; size_t nbytes; bool success = 0; if (npages < 0) { /* Unmap pages at the end of the region. */ nbytes = - npages * mmap_page_size; if (munmap (region_end - nbytes, nbytes) == -1) fprintf (stderr, "munmap: %s\n", emacs_strerror (errno)); else { r->nbytes_mapped -= nbytes; success = 1; } } else if (npages > 0) { nbytes = npages * mmap_page_size; /* Try to map additional pages at the end of the region. We cannot do this if the address range is already occupied by something else because mmap deletes any previous mapping. I'm not sure this is worth doing, let's see. */ if (!MMAP_ALLOCATED_P (region_end, region_end + nbytes)) { void *p; p = mmap (region_end, nbytes, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE | MAP_FIXED, mmap_fd, 0); if (p == MAP_FAILED) ; /* fprintf (stderr, "mmap: %s\n", emacs_strerror (errno)); */ else if (p != region_end) { /* Kernels are free to choose a different address. In that case, unmap what we've mapped above; we have no use for it. */ if (munmap (p, nbytes) == -1) fprintf (stderr, "munmap: %s\n", emacs_strerror (errno)); } else { r->nbytes_mapped += nbytes; success = 1; } } } return success; } /* Allocate a block of storage large enough to hold NBYTES bytes of data. A pointer to the data is returned in *VAR. VAR is thus the address of some variable which will use the data area. The allocation of 0 bytes is valid. If we can't allocate the necessary memory, set *VAR to null, and return null. */ static void * mmap_alloc (void **var, size_t nbytes) { void *p; size_t map; mmap_init (); map = ROUND (nbytes + MMAP_REGION_STRUCT_SIZE, mmap_page_size); p = mmap (NULL, map, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, mmap_fd, 0); if (p == MAP_FAILED) { if (errno != ENOMEM) fprintf (stderr, "mmap: %s\n", emacs_strerror (errno)); p = NULL; } else { struct mmap_region *r = p; r->nbytes_specified = nbytes; r->nbytes_mapped = map; r->var = var; r->prev = NULL; r->next = mmap_regions; if (r->next) r->next->prev = r; mmap_regions = r; p = MMAP_USER_AREA (p); } return *var = p; } /* Free a block of relocatable storage whose data is pointed to by PTR. Store 0 in *PTR to show there's no block allocated. */ static void mmap_free (void **var) { mmap_init (); if (*var) { mmap_free_1 (MMAP_REGION (*var)); *var = NULL; } } /* Given a pointer at address VAR to data allocated with mmap_alloc, resize it to size NBYTES. Change *VAR to reflect the new block, and return this value. If more memory cannot be allocated, then leave *VAR unchanged, and return null. */ static void * mmap_realloc (void **var, size_t nbytes) { void *result; mmap_init (); if (*var == NULL) result = mmap_alloc (var, nbytes); else if (nbytes == 0) { mmap_free (var); result = mmap_alloc (var, nbytes); } else { struct mmap_region *r = MMAP_REGION (*var); size_t room = r->nbytes_mapped - MMAP_REGION_STRUCT_SIZE; if (room < nbytes) { /* Must enlarge. */ void *old_ptr = *var; /* Try to map additional pages at the end of the region. If that fails, allocate a new region, copy data from the old region, then free it. */ if (mmap_enlarge (r, (ROUND (nbytes - room, mmap_page_size) / mmap_page_size))) { r->nbytes_specified = nbytes; *var = result = old_ptr; } else if (mmap_alloc (var, nbytes)) { memcpy (*var, old_ptr, r->nbytes_specified); mmap_free_1 (MMAP_REGION (old_ptr)); result = *var; r = MMAP_REGION (result); r->nbytes_specified = nbytes; } else { *var = old_ptr; result = NULL; } } else if (room - nbytes >= mmap_page_size) { /* Shrinking by at least a page. Let's give some memory back to the system. The extra parens are to make the division happens first, on positive values, so we know it will round towards zero. */ mmap_enlarge (r, - ((room - nbytes) / mmap_page_size)); result = *var; r->nbytes_specified = nbytes; } else { /* Leave it alone. */ result = *var; r->nbytes_specified = nbytes; } } return result; } #endif /* USE_MMAP_FOR_BUFFERS */ /*********************************************************************** Buffer-text Allocation ***********************************************************************/ /* Allocate NBYTES bytes for buffer B's text buffer. */ static void alloc_buffer_text (struct buffer *b, ptrdiff_t nbytes) { void *p; block_input (); #if defined USE_MMAP_FOR_BUFFERS p = mmap_alloc ((void **) &b->text->beg, nbytes); #elif defined REL_ALLOC p = r_alloc ((void **) &b->text->beg, nbytes); #else p = xmalloc (nbytes); #endif if (p == NULL) { unblock_input (); memory_full (nbytes); } b->text->beg = p; unblock_input (); } /* Enlarge buffer B's text buffer by DELTA bytes. DELTA < 0 means shrink it. */ void enlarge_buffer_text (struct buffer *b, ptrdiff_t delta) { block_input (); void *p; unsigned char *old_beg = b->text->beg; ptrdiff_t old_nbytes = BUF_Z_BYTE (b) - BUF_BEG_BYTE (b) + BUF_GAP_SIZE (b) + 1; ptrdiff_t new_nbytes = old_nbytes + delta; if (pdumper_object_p (old_beg)) b->text->beg = NULL; else old_beg = NULL; #if defined USE_MMAP_FOR_BUFFERS p = mmap_realloc ((void **) &b->text->beg, new_nbytes); #elif defined REL_ALLOC p = r_re_alloc ((void **) &b->text->beg, new_nbytes); #else p = xrealloc (b->text->beg, new_nbytes); #endif __lsan_ignore_object (p); if (p == NULL) { if (old_beg) b->text->beg = old_beg; unblock_input (); memory_full (new_nbytes); } if (old_beg) memcpy (p, old_beg, min (old_nbytes, new_nbytes)); BUF_BEG_ADDR (b) = p; unblock_input (); } /* Free buffer B's text buffer. */ static void free_buffer_text (struct buffer *b) { block_input (); if (!pdumper_object_p (b->text->beg)) { #if defined USE_MMAP_FOR_BUFFERS mmap_free ((void **) &b->text->beg); #elif defined REL_ALLOC r_alloc_free ((void **) &b->text->beg); #else xfree (b->text->beg); #endif } BUF_BEG_ADDR (b) = NULL; unblock_input (); } /*********************************************************************** Initialization ***********************************************************************/ void init_buffer_once (void) { /* TODO: clean up the buffer-local machinery. Right now, we have: buffer_defaults: default values of buffer-locals buffer_local_flags: metadata buffer_permanent_local_flags: metadata buffer_local_symbols: metadata There must be a simpler way to store the metadata. */ int idx; /* Items flagged permanent get an explicit permanent-local property added in bindings.el, for clarity. */ PDUMPER_REMEMBER_SCALAR (buffer_permanent_local_flags); memset (buffer_permanent_local_flags, 0, sizeof buffer_permanent_local_flags); /* 0 means not a lisp var, -1 means always local, else mask. */ memset (&buffer_local_flags, 0, sizeof buffer_local_flags); bset_filename (&buffer_local_flags, make_fixnum (-1)); bset_directory (&buffer_local_flags, make_fixnum (-1)); bset_backed_up (&buffer_local_flags, make_fixnum (-1)); bset_save_length (&buffer_local_flags, make_fixnum (-1)); bset_auto_save_file_name (&buffer_local_flags, make_fixnum (-1)); bset_read_only (&buffer_local_flags, make_fixnum (-1)); bset_major_mode (&buffer_local_flags, make_fixnum (-1)); bset_local_minor_modes (&buffer_local_flags, make_fixnum (-1)); bset_mode_name (&buffer_local_flags, make_fixnum (-1)); bset_undo_list (&buffer_local_flags, make_fixnum (-1)); bset_mark_active (&buffer_local_flags, make_fixnum (-1)); bset_point_before_scroll (&buffer_local_flags, make_fixnum (-1)); bset_file_truename (&buffer_local_flags, make_fixnum (-1)); bset_invisibility_spec (&buffer_local_flags, make_fixnum (-1)); bset_file_format (&buffer_local_flags, make_fixnum (-1)); bset_auto_save_file_format (&buffer_local_flags, make_fixnum (-1)); bset_display_count (&buffer_local_flags, make_fixnum (-1)); bset_display_time (&buffer_local_flags, make_fixnum (-1)); bset_enable_multibyte_characters (&buffer_local_flags, make_fixnum (-1)); /* These used to be stuck at 0 by default, but now that the all-zero value means Qnil, we have to initialize them explicitly. */ bset_name (&buffer_local_flags, make_fixnum (0)); bset_mark (&buffer_local_flags, make_fixnum (0)); bset_local_var_alist (&buffer_local_flags, make_fixnum (0)); bset_keymap (&buffer_local_flags, make_fixnum (0)); bset_downcase_table (&buffer_local_flags, make_fixnum (0)); bset_upcase_table (&buffer_local_flags, make_fixnum (0)); bset_case_canon_table (&buffer_local_flags, make_fixnum (0)); bset_case_eqv_table (&buffer_local_flags, make_fixnum (0)); bset_width_table (&buffer_local_flags, make_fixnum (0)); bset_pt_marker (&buffer_local_flags, make_fixnum (0)); bset_begv_marker (&buffer_local_flags, make_fixnum (0)); bset_zv_marker (&buffer_local_flags, make_fixnum (0)); bset_last_selected_window (&buffer_local_flags, make_fixnum (0)); idx = 1; XSETFASTINT (BVAR (&buffer_local_flags, mode_line_format), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, abbrev_mode), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, overwrite_mode), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, case_fold_search), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, auto_fill_function), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, selective_display), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, selective_display_ellipses), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, tab_width), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, truncate_lines), idx); /* Make this one a permanent local. */ buffer_permanent_local_flags[idx++] = 1; XSETFASTINT (BVAR (&buffer_local_flags, word_wrap), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, ctl_arrow), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, fill_column), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, left_margin), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, abbrev_table), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, display_table), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, syntax_table), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, cache_long_scans), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, category_table), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, bidi_display_reordering), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, bidi_paragraph_direction), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, bidi_paragraph_separate_re), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, bidi_paragraph_start_re), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, buffer_file_coding_system), idx); /* Make this one a permanent local. */ buffer_permanent_local_flags[idx++] = 1; XSETFASTINT (BVAR (&buffer_local_flags, left_margin_cols), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, right_margin_cols), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, left_fringe_width), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, right_fringe_width), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, fringes_outside_margins), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, scroll_bar_width), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, scroll_bar_height), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, vertical_scroll_bar_type), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, horizontal_scroll_bar_type), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, indicate_empty_lines), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, indicate_buffer_boundaries), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, fringe_indicator_alist), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, fringe_cursor_alist), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, scroll_up_aggressively), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, scroll_down_aggressively), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, header_line_format), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, tab_line_format), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, cursor_type), idx); ++idx; XSETFASTINT (BVAR (&buffer_local_flags, extra_line_spacing), idx); ++idx; #ifdef HAVE_TREE_SITTER XSETFASTINT (BVAR (&buffer_local_flags, ts_parser_list), idx); ++idx; #endif XSETFASTINT (BVAR (&buffer_local_flags, cursor_in_non_selected_windows), idx); ++idx; /* buffer_local_flags contains no pointers, so it's safe to treat it as a blob for pdumper. */ PDUMPER_REMEMBER_SCALAR (buffer_local_flags); /* Need more room? */ if (idx >= MAX_PER_BUFFER_VARS) emacs_abort (); last_per_buffer_idx = idx; PDUMPER_REMEMBER_SCALAR (last_per_buffer_idx); /* Make sure all markable slots in buffer_defaults are initialized reasonably, so mark_buffer won't choke. */ reset_buffer (&buffer_defaults); eassert (NILP (BVAR (&buffer_defaults, name))); reset_buffer_local_variables (&buffer_defaults, 1); eassert (NILP (BVAR (&buffer_local_symbols, name))); reset_buffer (&buffer_local_symbols); reset_buffer_local_variables (&buffer_local_symbols, 1); /* Prevent GC from getting confused. */ buffer_defaults.text = &buffer_defaults.own_text; buffer_local_symbols.text = &buffer_local_symbols.own_text; /* No one will share the text with these buffers, but let's play it safe. */ buffer_defaults.indirections = 0; buffer_local_symbols.indirections = 0; /* Likewise no one will display them. */ buffer_defaults.window_count = 0; buffer_local_symbols.window_count = 0; set_buffer_intervals (&buffer_defaults, NULL); set_buffer_intervals (&buffer_local_symbols, NULL); /* This is not strictly necessary, but let's make them initialized. */ bset_name (&buffer_defaults, build_pure_c_string (" *buffer-defaults*")); bset_name (&buffer_local_symbols, build_pure_c_string (" *buffer-local-symbols*")); BUFFER_PVEC_INIT (&buffer_defaults); BUFFER_PVEC_INIT (&buffer_local_symbols); /* Set up the default values of various buffer slots. */ /* Must do these before making the first buffer! */ /* real setup is done in bindings.el */ bset_mode_line_format (&buffer_defaults, build_pure_c_string ("%-")); bset_header_line_format (&buffer_defaults, Qnil); bset_tab_line_format (&buffer_defaults, Qnil); bset_abbrev_mode (&buffer_defaults, Qnil); bset_overwrite_mode (&buffer_defaults, Qnil); bset_case_fold_search (&buffer_defaults, Qt); bset_auto_fill_function (&buffer_defaults, Qnil); bset_selective_display (&buffer_defaults, Qnil); bset_selective_display_ellipses (&buffer_defaults, Qt); bset_abbrev_table (&buffer_defaults, Qnil); bset_display_table (&buffer_defaults, Qnil); bset_undo_list (&buffer_defaults, Qnil); bset_mark_active (&buffer_defaults, Qnil); bset_file_format (&buffer_defaults, Qnil); bset_auto_save_file_format (&buffer_defaults, Qt); buffer_defaults.overlays = NULL; XSETFASTINT (BVAR (&buffer_defaults, tab_width), 8); bset_truncate_lines (&buffer_defaults, Qnil); bset_word_wrap (&buffer_defaults, Qnil); bset_ctl_arrow (&buffer_defaults, Qt); bset_bidi_display_reordering (&buffer_defaults, Qt); bset_bidi_paragraph_direction (&buffer_defaults, Qnil); bset_bidi_paragraph_start_re (&buffer_defaults, Qnil); bset_bidi_paragraph_separate_re (&buffer_defaults, Qnil); bset_cursor_type (&buffer_defaults, Qt); bset_extra_line_spacing (&buffer_defaults, Qnil); #ifdef HAVE_TREE_SITTER bset_ts_parser_list (&buffer_defaults, Qnil); #endif bset_cursor_in_non_selected_windows (&buffer_defaults, Qt); bset_enable_multibyte_characters (&buffer_defaults, Qt); bset_buffer_file_coding_system (&buffer_defaults, Qnil); XSETFASTINT (BVAR (&buffer_defaults, fill_column), 70); XSETFASTINT (BVAR (&buffer_defaults, left_margin), 0); bset_cache_long_scans (&buffer_defaults, Qt); bset_file_truename (&buffer_defaults, Qnil); XSETFASTINT (BVAR (&buffer_defaults, display_count), 0); XSETFASTINT (BVAR (&buffer_defaults, left_margin_cols), 0); XSETFASTINT (BVAR (&buffer_defaults, right_margin_cols), 0); bset_left_fringe_width (&buffer_defaults, Qnil); bset_right_fringe_width (&buffer_defaults, Qnil); bset_fringes_outside_margins (&buffer_defaults, Qnil); bset_scroll_bar_width (&buffer_defaults, Qnil); bset_scroll_bar_height (&buffer_defaults, Qnil); bset_vertical_scroll_bar_type (&buffer_defaults, Qt); bset_horizontal_scroll_bar_type (&buffer_defaults, Qt); bset_indicate_empty_lines (&buffer_defaults, Qnil); bset_indicate_buffer_boundaries (&buffer_defaults, Qnil); bset_fringe_indicator_alist (&buffer_defaults, Qnil); bset_fringe_cursor_alist (&buffer_defaults, Qnil); bset_scroll_up_aggressively (&buffer_defaults, Qnil); bset_scroll_down_aggressively (&buffer_defaults, Qnil); bset_display_time (&buffer_defaults, Qnil); /* Assign the local-flags to the slots that have default values. The local flag is a bit that is used in the buffer to say that it has its own local value for the slot. The local flag bits are in the local_var_flags slot of the buffer. */ /* Nothing can work if this isn't true. */ { verify (sizeof (EMACS_INT) == word_size); } Vbuffer_alist = Qnil; current_buffer = 0; pdumper_remember_lv_ptr_raw (¤t_buffer, Lisp_Vectorlike); QSFundamental = build_pure_c_string ("Fundamental"); DEFSYM (Qfundamental_mode, "fundamental-mode"); bset_major_mode (&buffer_defaults, Qfundamental_mode); DEFSYM (Qmode_class, "mode-class"); DEFSYM (Qprotected_field, "protected-field"); DEFSYM (Qpermanent_local, "permanent-local"); DEFSYM (Qkill_buffer_hook, "kill-buffer-hook"); Fput (Qkill_buffer_hook, Qpermanent_local, Qt); /* Super-magic invisible buffer. */ Vprin1_to_string_buffer = Fget_buffer_create (build_pure_c_string (" prin1"), Qt); Vbuffer_alist = Qnil; Fset_buffer (Fget_buffer_create (build_pure_c_string ("*scratch*"), Qnil)); inhibit_modification_hooks = 0; } void init_buffer (void) { Lisp_Object temp; #ifdef USE_MMAP_FOR_BUFFERS if (dumped_with_unexec_p ()) { Lisp_Object tail, buffer; #ifndef WINDOWSNT /* These must be reset in the dumped Emacs, to avoid stale references to mmap'ed memory from before the dump. WINDOWSNT doesn't need this because it doesn't track mmap'ed regions by hand (see w32heap.c, which uses system APIs for that purpose), and thus doesn't use mmap_regions. */ mmap_regions = NULL; mmap_fd = -1; #endif /* The dumped buffers reference addresses of buffer text recorded by temacs, that cannot be used by the dumped Emacs. We map new memory for their text here. Implementation notes: the buffers we carry from temacs are: " prin1", "*scratch*", " *Minibuf-0*", "*Messages*", and " *code-conversion-work*". They are created by init_buffer_once and init_window_once (which are not called in the dumped Emacs), and by the first call to coding.c routines. Since FOR_EACH_LIVE_BUFFER only walks the buffers in Vbuffer_alist, any buffer we carry from temacs that is not in the alist (a.k.a. "magic invisible buffers") should be handled here explicitly. */ FOR_EACH_LIVE_BUFFER (tail, buffer) { struct buffer *b = XBUFFER (buffer); b->text->beg = NULL; enlarge_buffer_text (b, 0); } /* The " prin1" buffer is not in Vbuffer_alist. */ XBUFFER (Vprin1_to_string_buffer)->text->beg = NULL; enlarge_buffer_text (XBUFFER (Vprin1_to_string_buffer), 0); } #endif /* USE_MMAP_FOR_BUFFERS */ AUTO_STRING (scratch, "*scratch*"); Fset_buffer (Fget_buffer_create (scratch, Qnil)); if (NILP (BVAR (&buffer_defaults, enable_multibyte_characters))) Fset_buffer_multibyte (Qnil); char const *pwd = emacs_wd; if (!pwd) { fprintf (stderr, "Error getting directory: %s\n", emacs_strerror (errno)); bset_directory (current_buffer, Qnil); } else { /* Maybe this should really use some standard subroutine whose definition is filename syntax dependent. */ ptrdiff_t len = strlen (pwd); bool add_slash = ! IS_DIRECTORY_SEP (pwd[len - 1]); /* At this moment, we still don't know how to decode the directory name. So, we keep the bytes in unibyte form so that file I/O routines correctly get the original bytes. */ Lisp_Object dirname = make_unibyte_string (pwd, len + add_slash); if (add_slash) SSET (dirname, len, DIRECTORY_SEP); bset_directory (current_buffer, dirname); /* Add /: to the front of the name if it would otherwise be treated as magic. */ temp = Ffind_file_name_handler (BVAR (current_buffer, directory), Qt); if (! NILP (temp) /* If the default dir is just /, TEMP is non-nil because of the ange-ftp completion handler. However, it is not necessary to turn / into /:/. So avoid doing that. */ && strcmp ("/", SSDATA (BVAR (current_buffer, directory)))) { AUTO_STRING (slash_colon, "/:"); bset_directory (current_buffer, concat2 (slash_colon, BVAR (current_buffer, directory))); } } temp = get_minibuffer (0); bset_directory (XBUFFER (temp), BVAR (current_buffer, directory)); } /* Similar to defvar_lisp but define a variable whose value is the Lisp_Object stored in the current buffer. LNAME is the Lisp-level variable name. VNAME is the name of the buffer slot. PREDICATE is nil for a general Lisp variable. If PREDICATE is non-nil, then only Lisp values that satisfies the PREDICATE are allowed (except that nil is allowed too). DOC is a dummy where you write the doc string as a comment. */ #define DEFVAR_PER_BUFFER(lname, vname, predicate, doc) \ do { \ static struct Lisp_Buffer_Objfwd bo_fwd; \ defvar_per_buffer (&bo_fwd, lname, vname, predicate); \ } while (0) static void defvar_per_buffer (struct Lisp_Buffer_Objfwd *bo_fwd, const char *namestring, Lisp_Object *address, Lisp_Object predicate) { struct Lisp_Symbol *sym; int offset; sym = XSYMBOL (intern (namestring)); offset = (char *)address - (char *)current_buffer; bo_fwd->type = Lisp_Fwd_Buffer_Obj; bo_fwd->offset = offset; bo_fwd->predicate = predicate; sym->u.s.declared_special = true; sym->u.s.redirect = SYMBOL_FORWARDED; SET_SYMBOL_FWD (sym, bo_fwd); XSETSYMBOL (PER_BUFFER_SYMBOL (offset), sym); if (PER_BUFFER_IDX (offset) == 0) /* Did a DEFVAR_PER_BUFFER without initializing the corresponding slot of buffer_local_flags. */ emacs_abort (); } #ifdef ITREE_DEBUG static Lisp_Object make_lispy_itree_node (const struct itree_node *node) { return listn (12, intern (":begin"), make_fixnum (node->begin), intern (":end"), make_fixnum (node->end), intern (":limit"), make_fixnum (node->limit), intern (":offset"), make_fixnum (node->offset), intern (":rear-advance"), node->rear_advance ? Qt : Qnil, intern (":front-advance"), node->front_advance ? Qt : Qnil); } static Lisp_Object overlay_tree (const struct itree_tree *tree, const struct itree_node *node) { if (node == ITREE_NULL) return Qnil; return list3 (make_lispy_itree_node (node), overlay_tree (tree, node->left), overlay_tree (tree, node->right)); } DEFUN ("overlay-tree", Foverlay_tree, Soverlay_tree, 0, 1, 0, doc: /* Get the overlay tree for BUFFER. */) (Lisp_Object buffer) { struct buffer *b = decode_buffer (buffer); if (! b->overlays) return Qnil; return overlay_tree (b->overlays, b->overlays->root); } #endif /* Initialize the buffer routines. */ void syms_of_buffer (void) { staticpro (&last_overlay_modification_hooks); last_overlay_modification_hooks = make_nil_vector (10); staticpro (&QSFundamental); staticpro (&Vbuffer_alist); DEFSYM (Qchoice, "choice"); DEFSYM (Qleft, "left"); DEFSYM (Qright, "right"); DEFSYM (Qrange, "range"); DEFSYM (Qpermanent_local_hook, "permanent-local-hook"); DEFSYM (Qoverlayp, "overlayp"); DEFSYM (Qevaporate, "evaporate"); DEFSYM (Qmodification_hooks, "modification-hooks"); DEFSYM (Qinsert_in_front_hooks, "insert-in-front-hooks"); DEFSYM (Qinsert_behind_hooks, "insert-behind-hooks"); DEFSYM (Qget_file_buffer, "get-file-buffer"); DEFSYM (Qpriority, "priority"); DEFSYM (Qbefore_string, "before-string"); DEFSYM (Qafter_string, "after-string"); DEFSYM (Qfirst_change_hook, "first-change-hook"); DEFSYM (Qbefore_change_functions, "before-change-functions"); DEFSYM (Qafter_change_functions, "after-change-functions"); DEFSYM (Qkill_buffer_query_functions, "kill-buffer-query-functions"); DEFSYM (Qget_scratch_buffer_create, "get-scratch-buffer-create"); DEFSYM (Qvertical_scroll_bar, "vertical-scroll-bar"); Fput (Qvertical_scroll_bar, Qchoice, list4 (Qnil, Qt, Qleft, Qright)); DEFSYM (Qhorizontal_scroll_bar, "horizontal-scroll-bar"); DEFSYM (Qfraction, "fraction"); Fput (Qfraction, Qrange, Fcons (make_float (0.0), make_float (1.0))); DEFSYM (Qoverwrite_mode, "overwrite-mode"); Fput (Qoverwrite_mode, Qchoice, list3 (Qnil, intern ("overwrite-mode-textual"), Qoverwrite_mode_binary)); Fput (Qprotected_field, Qerror_conditions, pure_list (Qprotected_field, Qerror)); Fput (Qprotected_field, Qerror_message, build_pure_c_string ("Attempt to modify a protected field")); DEFSYM (Qclone_indirect_buffer_hook, "clone-indirect-buffer-hook"); DEFVAR_PER_BUFFER ("tab-line-format", &BVAR (current_buffer, tab_line_format), Qnil, doc: /* Analogous to `mode-line-format', but controls the tab line. The tab line appears, optionally, at the top of a window; the mode line appears at the bottom. */); DEFVAR_PER_BUFFER ("header-line-format", &BVAR (current_buffer, header_line_format), Qnil, doc: /* Analogous to `mode-line-format', but controls the header line. The header line appears, optionally, at the top of a window; the mode line appears at the bottom. Also see `header-line-indent-mode' if `display-line-number-mode' is used. */); DEFVAR_PER_BUFFER ("mode-line-format", &BVAR (current_buffer, mode_line_format), Qnil, doc: /* Template for displaying mode line for a window's buffer. The value may be nil, a string, a symbol or a list. A value of nil means don't display a mode line. For any symbol other than t or nil, the symbol's value is processed as a mode line construct. As a special exception, if that value is a string, the string is processed verbatim, without handling any %-constructs (see below). Also, unless the symbol has a non-nil `risky-local-variable' property, all properties in any strings, as well as all :eval and :propertize forms in the value, are ignored. When the value is processed, the window's buffer is temporarily the current buffer. A list whose car is a string or list is processed by processing each of the list elements recursively, as separate mode line constructs, and concatenating the results. A list of the form `(:eval FORM)' is processed by evaluating FORM and using the result as a mode line construct. Be careful--FORM should not load any files, because that can cause an infinite recursion. A list of the form `(:propertize ELT PROPS...)' is processed by processing ELT as the mode line construct, and adding the text properties PROPS to the result. A list whose car is a symbol is processed by examining the symbol's value, and, if that value is non-nil, processing the cadr of the list recursively; and if that value is nil, processing the caddr of the list recursively. A list whose car is an integer is processed by processing the cadr of the list, and padding (if the number is positive) or truncating (if negative) to the width specified by that number. A string is printed verbatim in the mode line except for %-constructs: %b -- print buffer name. %f -- print visited file name. %F -- print frame name. %* -- print %, * or hyphen. %+ -- print *, % or hyphen. %& is like %*, but ignore read-only-ness. % means buffer is read-only and * means it is modified. For a modified read-only buffer, %* gives % and %+ gives *. %s -- print process status. %l -- print the current line number. %c -- print the current column number (this makes editing slower). Columns are numbered starting from the left margin, and the leftmost column is displayed as zero. To make the column number update correctly in all cases, `column-number-mode' must be non-nil. %C -- Like %c, but the leftmost column is displayed as one. %i -- print the size of the buffer. %I -- like %i, but use k, M, G, etc., to abbreviate. %p -- print percent of buffer above top of window, or Top, Bot or All. %P -- print percent of buffer above bottom of window, perhaps plus Top, or print Bottom or All. %n -- print Narrow if appropriate. %t -- visited file is text or binary (if OS supports this distinction). %z -- print mnemonics of keyboard, terminal, and buffer coding systems. %Z -- like %z, but including the end-of-line format. %e -- print error message about full memory. %@ -- print @ or hyphen. @ means that default-directory is on a remote machine. %[ -- print one [ for each recursive editing level. %] similar. %% -- print %. %- -- print infinitely many dashes. Decimal digits after the % specify field width to which to pad. */); DEFVAR_PER_BUFFER ("major-mode", &BVAR (current_buffer, major_mode), Qsymbolp, doc: /* Symbol for current buffer's major mode. The default value (normally `fundamental-mode') affects new buffers. A value of nil means to use the current buffer's major mode, provided it is not marked as "special". */); DEFVAR_PER_BUFFER ("local-minor-modes", &BVAR (current_buffer, local_minor_modes), Qnil, doc: /* Minor modes currently active in the current buffer. This is a list of symbols, or nil if there are no minor modes active. */); DEFVAR_PER_BUFFER ("mode-name", &BVAR (current_buffer, mode_name), Qnil, doc: /* Pretty name of current buffer's major mode. Usually a string, but can use any of the constructs for `mode-line-format', which see. Format with `format-mode-line' to produce a string value. */); DEFVAR_PER_BUFFER ("local-abbrev-table", &BVAR (current_buffer, abbrev_table), Qnil, doc: /* Local (mode-specific) abbrev table of current buffer. */); DEFVAR_PER_BUFFER ("abbrev-mode", &BVAR (current_buffer, abbrev_mode), Qnil, doc: /* Non-nil if Abbrev mode is enabled. Use the command `abbrev-mode' to change this variable. */); DEFVAR_PER_BUFFER ("case-fold-search", &BVAR (current_buffer, case_fold_search), Qnil, doc: /* Non-nil if searches and matches should ignore case. */); DEFVAR_PER_BUFFER ("fill-column", &BVAR (current_buffer, fill_column), Qintegerp, doc: /* Column beyond which automatic line-wrapping should happen. It is used by filling commands, such as `fill-region' and `fill-paragraph', and by `auto-fill-mode', which see. See also `current-fill-column'. Interactively, you can set the buffer local value using \\[set-fill-column]. */); DEFVAR_PER_BUFFER ("left-margin", &BVAR (current_buffer, left_margin), Qintegerp, doc: /* Column for the default `indent-line-function' to indent to. Linefeed indents to this column in Fundamental mode. */); DEFVAR_PER_BUFFER ("tab-width", &BVAR (current_buffer, tab_width), Qintegerp, doc: /* Distance between tab stops (for display of tab characters), in columns. This controls the width of a TAB character on display. The value should be a positive integer. Note that this variable doesn't necessarily affect the size of the indentation step. However, if the major mode's indentation facility inserts one or more TAB characters, this variable will affect the indentation step as well, even if `indent-tabs-mode' is non-nil. */); DEFVAR_PER_BUFFER ("ctl-arrow", &BVAR (current_buffer, ctl_arrow), Qnil, doc: /* Non-nil means display control chars with uparrow `^'. A value of nil means use backslash `\\' and octal digits. This variable does not apply to characters whose display is specified in the current display table (if there is one; see `standard-display-table'). */); DEFVAR_PER_BUFFER ("enable-multibyte-characters", &BVAR (current_buffer, enable_multibyte_characters), Qnil, doc: /* Non-nil means the buffer contents are regarded as multi-byte characters. Otherwise they are regarded as unibyte. This affects the display, file I/O and the behavior of various editing commands. This variable is buffer-local but you cannot set it directly; use the function `set-buffer-multibyte' to change a buffer's representation. To prevent any attempts to set it or make it buffer-local, Emacs will signal an error in those cases. See also Info node `(elisp)Text Representations'. */); make_symbol_constant (intern_c_string ("enable-multibyte-characters")); DEFVAR_PER_BUFFER ("buffer-file-coding-system", &BVAR (current_buffer, buffer_file_coding_system), Qnil, doc: /* Coding system to be used for encoding the buffer contents on saving. This variable applies to saving the buffer, and also to `write-region' and other functions that use `write-region'. It does not apply to sending output to subprocesses, however. If this is nil, the buffer is saved without any code conversion unless some coding system is specified in `file-coding-system-alist' for the buffer file. If the text to be saved cannot be encoded as specified by this variable, an alternative encoding is selected by `select-safe-coding-system', which see. The variable `coding-system-for-write', if non-nil, overrides this variable. This variable is never applied to a way of decoding a file while reading it. */); DEFVAR_PER_BUFFER ("bidi-display-reordering", &BVAR (current_buffer, bidi_display_reordering), Qnil, doc: /* Non-nil means reorder bidirectional text for display in the visual order. Setting this to nil is intended for use in debugging the display code. Don't set to nil in normal sessions, as that is not supported. See also `bidi-paragraph-direction'; setting that non-nil might speed up redisplay. */); DEFVAR_PER_BUFFER ("bidi-paragraph-start-re", &BVAR (current_buffer, bidi_paragraph_start_re), Qnil, doc: /* If non-nil, a regexp matching a line that starts OR separates paragraphs. The value of nil means to use empty lines as lines that start and separate paragraphs. When Emacs displays bidirectional text, it by default computes the base paragraph direction separately for each paragraph. Setting this variable changes the places where paragraph base direction is recomputed. The regexp is always matched after a newline, so it is best to anchor it by beginning it with a "^". If you change the value of this variable, be sure to change the value of `bidi-paragraph-separate-re' accordingly. For example, to have a single newline behave as a paragraph separator, set both these variables to "^". See also `bidi-paragraph-direction'. */); DEFVAR_PER_BUFFER ("bidi-paragraph-separate-re", &BVAR (current_buffer, bidi_paragraph_separate_re), Qnil, doc: /* If non-nil, a regexp matching a line that separates paragraphs. The value of nil means to use empty lines as paragraph separators. When Emacs displays bidirectional text, it by default computes the base paragraph direction separately for each paragraph. Setting this variable changes the places where paragraph base direction is recomputed. The regexp is always matched after a newline, so it is best to anchor it by beginning it with a "^". If you change the value of this variable, be sure to change the value of `bidi-paragraph-start-re' accordingly. For example, to have a single newline behave as a paragraph separator, set both these variables to "^". See also `bidi-paragraph-direction'. */); DEFVAR_PER_BUFFER ("bidi-paragraph-direction", &BVAR (current_buffer, bidi_paragraph_direction), Qnil, doc: /* If non-nil, forces directionality of text paragraphs in the buffer. If this is nil (the default), the direction of each paragraph is determined by the first strong directional character of its text. The values of `right-to-left' and `left-to-right' override that. Any other value is treated as nil. This variable has no effect unless the buffer's value of `bidi-display-reordering' is non-nil. */); DEFVAR_PER_BUFFER ("truncate-lines", &BVAR (current_buffer, truncate_lines), Qnil, doc: /* Non-nil means do not display continuation lines. Instead, give each line of text just one screen line. Note that this is overridden by the variable `truncate-partial-width-windows' if that variable is non-nil and this buffer is not full-frame width. Minibuffers set this variable to nil. Don't set this to a non-nil value when `visual-line-mode' is turned on, as it could produce confusing results. */); DEFVAR_PER_BUFFER ("word-wrap", &BVAR (current_buffer, word_wrap), Qnil, doc: /* Non-nil means to use word-wrapping for continuation lines. When word-wrapping is on, continuation lines are wrapped at the space or tab character nearest to the right window edge. If nil, continuation lines are wrapped at the right screen edge. This variable has no effect if long lines are truncated (see `truncate-lines' and `truncate-partial-width-windows'). If you use word-wrapping, you might want to reduce the value of `truncate-partial-width-windows', since wrapping can make text readable in narrower windows. Instead of setting this variable directly, most users should use Visual Line mode. Visual Line mode, when enabled, sets `word-wrap' to t, and additionally redefines simple editing commands to act on visual lines rather than logical lines. See the documentation of `visual-line-mode'. */); DEFVAR_PER_BUFFER ("default-directory", &BVAR (current_buffer, directory), Qstringp, doc: /* Name of default directory of current buffer. It should be an absolute directory name; on GNU and Unix systems, these names start with `/' or `~' and end with `/'. To interactively change the default directory, use command `cd'. */); DEFVAR_PER_BUFFER ("auto-fill-function", &BVAR (current_buffer, auto_fill_function), Qnil, doc: /* Function called (if non-nil) to perform auto-fill. It is called after self-inserting any character specified in the `auto-fill-chars' table. NOTE: This variable is not a hook; its value may not be a list of functions. */); DEFVAR_PER_BUFFER ("buffer-file-name", &BVAR (current_buffer, filename), Qstringp, doc: /* Name of file visited in current buffer, or nil if not visiting a file. This should be an absolute file name. */); DEFVAR_PER_BUFFER ("buffer-file-truename", &BVAR (current_buffer, file_truename), Qstringp, doc: /* Abbreviated truename of file visited in current buffer, or nil if none. The truename of a file is calculated by `file-truename' and then abbreviated with `abbreviate-file-name'. */); DEFVAR_PER_BUFFER ("buffer-auto-save-file-name", &BVAR (current_buffer, auto_save_file_name), Qstringp, doc: /* Name of file for auto-saving current buffer. If it is nil, that means don't auto-save this buffer. */); DEFVAR_PER_BUFFER ("buffer-read-only", &BVAR (current_buffer, read_only), Qnil, doc: /* Non-nil if this buffer is read-only. */); DEFVAR_PER_BUFFER ("buffer-backed-up", &BVAR (current_buffer, backed_up), Qnil, doc: /* Non-nil if this buffer's file has been backed up. Backing up is done before the first time the file is saved. */); DEFVAR_PER_BUFFER ("buffer-saved-size", &BVAR (current_buffer, save_length), Qintegerp, doc: /* Length of current buffer when last read in, saved or auto-saved. 0 initially. -1 means auto-saving turned off until next real save. If you set this to -2, that means don't turn off auto-saving in this buffer if its text size shrinks. If you use `buffer-swap-text' on a buffer, you probably should set this to -2 in that buffer. */); DEFVAR_PER_BUFFER ("selective-display", &BVAR (current_buffer, selective_display), Qnil, doc: /* Non-nil enables selective display. An integer N as value means display only lines that start with less than N columns of space. A value of t means that the character ^M makes itself and all the rest of the line invisible; also, when saving the buffer in a file, save the ^M as a newline. This usage is obsolete; use overlays or text properties instead. */); DEFVAR_PER_BUFFER ("selective-display-ellipses", &BVAR (current_buffer, selective_display_ellipses), Qnil, doc: /* Non-nil means display ... on previous line when a line is invisible. */); DEFVAR_PER_BUFFER ("overwrite-mode", &BVAR (current_buffer, overwrite_mode), Qoverwrite_mode, doc: /* Non-nil if self-insertion should replace existing text. The value should be one of `overwrite-mode-textual', `overwrite-mode-binary', or nil. If it is `overwrite-mode-textual', self-insertion still inserts at the end of a line, and inserts when point is before a tab, until the tab is filled in. If `overwrite-mode-binary', self-insertion replaces newlines and tabs too. */); DEFVAR_PER_BUFFER ("buffer-display-table", &BVAR (current_buffer, display_table), Qnil, doc: /* Display table that controls display of the contents of current buffer. If this variable is nil, the value of `standard-display-table' is used. Each window can have its own, overriding display table, see `set-window-display-table' and `window-display-table'. The display table is a char-table created with `make-display-table'. A char-table is an array indexed by character codes. Normal array primitives `aref' and `aset' can be used to access elements of a char-table. Each of the char-table elements control how to display the corresponding text character: the element at index C in the table says how to display the character whose code is C. Each element should be a vector of characters or nil. The value nil means display the character in the default fashion; otherwise, the characters from the vector are delivered to the screen instead of the original character. For example, (aset buffer-display-table ?X [?Y]) tells Emacs to display a capital Y instead of each X character. In addition, a char-table has six extra slots to control the display of: the end of a truncated screen line (extra-slot 0, a single character); the end of a continued line (extra-slot 1, a single character); the escape character used to display character codes in octal (extra-slot 2, a single character); the character used as an arrow for control characters (extra-slot 3, a single character); the decoration indicating the presence of invisible lines (extra-slot 4, a vector of characters); the character used to draw the border between side-by-side windows (extra-slot 5, a single character). See also the functions `display-table-slot' and `set-display-table-slot'. */); DEFVAR_PER_BUFFER ("left-margin-width", &BVAR (current_buffer, left_margin_cols), Qintegerp, doc: /* Width in columns of left marginal area for display of a buffer. A value of nil means no marginal area. Setting this variable does not take effect until a new buffer is displayed in a window. To make the change take effect, call `set-window-buffer'. */); DEFVAR_PER_BUFFER ("right-margin-width", &BVAR (current_buffer, right_margin_cols), Qintegerp, doc: /* Width in columns of right marginal area for display of a buffer. A value of nil means no marginal area. Setting this variable does not take effect until a new buffer is displayed in a window. To make the change take effect, call `set-window-buffer'. */); DEFVAR_PER_BUFFER ("left-fringe-width", &BVAR (current_buffer, left_fringe_width), Qintegerp, doc: /* Width of this buffer's left fringe (in pixels). A value of 0 means no left fringe is shown in this buffer's window. A value of nil means to use the left fringe width from the window's frame. Setting this variable does not take effect until a new buffer is displayed in a window. To make the change take effect, call `set-window-buffer'. */); DEFVAR_PER_BUFFER ("right-fringe-width", &BVAR (current_buffer, right_fringe_width), Qintegerp, doc: /* Width of this buffer's right fringe (in pixels). A value of 0 means no right fringe is shown in this buffer's window. A value of nil means to use the right fringe width from the window's frame. Setting this variable does not take effect until a new buffer is displayed in a window. To make the change take effect, call `set-window-buffer'. */); DEFVAR_PER_BUFFER ("fringes-outside-margins", &BVAR (current_buffer, fringes_outside_margins), Qnil, doc: /* Non-nil means to display fringes outside display margins. A value of nil means to display fringes between margins and buffer text. Setting this variable does not take effect until a new buffer is displayed in a window. To make the change take effect, call `set-window-buffer'. */); DEFVAR_PER_BUFFER ("scroll-bar-width", &BVAR (current_buffer, scroll_bar_width), Qintegerp, doc: /* Width of this buffer's vertical scroll bars in pixels. A value of nil means to use the scroll bar width from the window's frame. */); DEFVAR_PER_BUFFER ("scroll-bar-height", &BVAR (current_buffer, scroll_bar_height), Qintegerp, doc: /* Height of this buffer's horizontal scroll bars in pixels. A value of nil means to use the scroll bar height from the window's frame. */); DEFVAR_PER_BUFFER ("vertical-scroll-bar", &BVAR (current_buffer, vertical_scroll_bar_type), Qvertical_scroll_bar, doc: /* Position of this buffer's vertical scroll bar. The value takes effect whenever you tell a window to display this buffer; for instance, with `set-window-buffer' or when `display-buffer' displays it. A value of `left' or `right' means put the vertical scroll bar at that side of the window; a value of nil means don't show any vertical scroll bars. A value of t (the default) means do whatever the window's frame specifies. */); DEFVAR_PER_BUFFER ("horizontal-scroll-bar", &BVAR (current_buffer, horizontal_scroll_bar_type), Qnil, doc: /* Position of this buffer's horizontal scroll bar. The value takes effect whenever you tell a window to display this buffer; for instance, with `set-window-buffer' or when `display-buffer' displays it. A value of `bottom' means put the horizontal scroll bar at the bottom of the window; a value of nil means don't show any horizontal scroll bars. A value of t (the default) means do whatever the window's frame specifies. */); DEFVAR_PER_BUFFER ("indicate-empty-lines", &BVAR (current_buffer, indicate_empty_lines), Qnil, doc: /* Visually indicate unused ("empty") screen lines after the buffer end. If non-nil, a bitmap is displayed in the left fringe of a window on graphical displays for each screen line that doesn't correspond to any buffer text. */); DEFVAR_PER_BUFFER ("indicate-buffer-boundaries", &BVAR (current_buffer, indicate_buffer_boundaries), Qnil, doc: /* Visually indicate buffer boundaries and scrolling. If non-nil, the first and last line of the buffer are marked in the fringe of a window on graphical displays with angle bitmaps, or if the window can be scrolled, the top and bottom line of the window are marked with up and down arrow bitmaps. If value is a symbol `left' or `right', both angle and arrow bitmaps are displayed in the left or right fringe, resp. Any other value that doesn't look like an alist means display the angle bitmaps in the left fringe but no arrows. You can exercise more precise control by using an alist as the value. Each alist element (INDICATOR . POSITION) specifies where to show one of the indicators. INDICATOR is one of `top', `bottom', `up', `down', or t, which specifies the default position, and POSITION is one of `left', `right', or nil, meaning do not show this indicator. For example, ((top . left) (t . right)) places the top angle bitmap in left fringe, the bottom angle bitmap in right fringe, and both arrow bitmaps in right fringe. To show just the angle bitmaps in the left fringe, but no arrow bitmaps, use ((top . left) (bottom . left)). */); DEFVAR_PER_BUFFER ("fringe-indicator-alist", &BVAR (current_buffer, fringe_indicator_alist), Qnil, doc: /* Mapping from logical to physical fringe indicator bitmaps. The value is an alist where each element (INDICATOR . BITMAPS) specifies the fringe bitmaps used to display a specific logical fringe indicator. INDICATOR specifies the logical indicator type which is one of the following symbols: `truncation' , `continuation', `overlay-arrow', `top', `bottom', `top-bottom', `up', `down', empty-line', or `unknown'. BITMAPS is a list of symbols (LEFT RIGHT [LEFT1 RIGHT1]) which specifies the actual bitmap shown in the left or right fringe for the logical indicator. LEFT and RIGHT are the bitmaps shown in the left and/or right fringe for the specific indicator. The LEFT1 or RIGHT1 bitmaps are used only for the `bottom' and `top-bottom' indicators when the last (only) line has no final newline. BITMAPS may also be a single symbol which is used in both left and right fringes. */); DEFVAR_PER_BUFFER ("fringe-cursor-alist", &BVAR (current_buffer, fringe_cursor_alist), Qnil, doc: /* Mapping from logical to physical fringe cursor bitmaps. The value is an alist where each element (CURSOR . BITMAP) specifies the fringe bitmaps used to display a specific logical cursor type in the fringe. CURSOR specifies the logical cursor type which is one of the following symbols: `box' , `hollow', `bar', `hbar', or `hollow-small'. The last one is used to show a hollow cursor on narrow lines display lines where the normal hollow cursor will not fit. BITMAP is the corresponding fringe bitmap shown for the logical cursor type. */); DEFVAR_PER_BUFFER ("scroll-up-aggressively", &BVAR (current_buffer, scroll_up_aggressively), Qfraction, doc: /* How far to scroll windows upward. If you move point off the bottom, the window scrolls automatically. This variable controls how far it scrolls. The value nil, the default, means scroll to center point. A fraction means scroll to put point that fraction of the window's height from the bottom of the window. When the value is 0.0, point goes at the bottom line, which in the simple case that you moved off with C-f means scrolling just one line. 1.0 means point goes at the top, so that in that simple case, the window scrolls by a full window height. Meaningful values are between 0.0 and 1.0, inclusive. */); DEFVAR_PER_BUFFER ("scroll-down-aggressively", &BVAR (current_buffer, scroll_down_aggressively), Qfraction, doc: /* How far to scroll windows downward. If you move point off the top, the window scrolls automatically. This variable controls how far it scrolls. The value nil, the default, means scroll to center point. A fraction means scroll to put point that fraction of the window's height from the top of the window. When the value is 0.0, point goes at the top line, which in the simple case that you moved off with C-b means scrolling just one line. 1.0 means point goes at the bottom, so that in that simple case, the window scrolls by a full window height. Meaningful values are between 0.0 and 1.0, inclusive. */); DEFVAR_LISP ("before-change-functions", Vbefore_change_functions, doc: /* List of functions to call before each text change. Two arguments are passed to each function: the positions of the beginning and end of the range of old text to be changed. \(For an insertion, the beginning and end are at the same place.) No information is given about the length of the text after the change. Buffer changes made while executing the `before-change-functions' don't call any before-change or after-change functions. That's because `inhibit-modification-hooks' is temporarily set non-nil. If an unhandled error happens in running these functions, the variable's value remains nil. That prevents the error from happening repeatedly and making Emacs nonfunctional. */); Vbefore_change_functions = Qnil; DEFVAR_LISP ("after-change-functions", Vafter_change_functions, doc: /* List of functions to call after each text change. Three arguments are passed to each function: the positions of the beginning and end of the range of changed text, and the length in chars of the pre-change text replaced by that range. \(For an insertion, the pre-change length is zero; for a deletion, that length is the number of chars deleted, and the post-change beginning and end are at the same place.) Buffer changes made while executing the `after-change-functions' don't call any before-change or after-change functions. That's because `inhibit-modification-hooks' is temporarily set non-nil. If an unhandled error happens in running these functions, the variable's value remains nil. That prevents the error from happening repeatedly and making Emacs nonfunctional. */); Vafter_change_functions = Qnil; DEFVAR_LISP ("first-change-hook", Vfirst_change_hook, doc: /* A list of functions to call before changing a buffer which is unmodified. The functions are run using the `run-hooks' function. */); Vfirst_change_hook = Qnil; DEFVAR_PER_BUFFER ("buffer-undo-list", &BVAR (current_buffer, undo_list), Qnil, doc: /* List of undo entries in current buffer. Recent changes come first; older changes follow newer. An entry (BEG . END) represents an insertion which begins at position BEG and ends at position END. An entry (TEXT . POSITION) represents the deletion of the string TEXT from (abs POSITION). If POSITION is positive, point was at the front of the text being deleted; if negative, point was at the end. An entry (t . TIMESTAMP), where TIMESTAMP is in the style of `current-time', indicates that the buffer was previously unmodified; TIMESTAMP is the visited file's modification time, as of that time. If the modification time of the most recent save is different, this entry is obsolete. An entry (t . 0) means the buffer was previously unmodified but its time stamp was unknown because it was not associated with a file. An entry (t . -1) is similar, except that it means the buffer's visited file did not exist. An entry (nil PROPERTY VALUE BEG . END) indicates that a text property was modified between BEG and END. PROPERTY is the property name, and VALUE is the old value. An entry (apply FUN-NAME . ARGS) means undo the change with \(apply FUN-NAME ARGS). An entry (apply DELTA BEG END FUN-NAME . ARGS) supports selective undo in the active region. BEG and END is the range affected by this entry and DELTA is the number of characters added or deleted in that range by this change. An entry (MARKER . DISTANCE) indicates that the marker MARKER was adjusted in position by the offset DISTANCE (an integer). An entry of the form POSITION indicates that point was at the buffer location given by the integer. Undoing an entry of this form places point at POSITION. Entries with value nil mark undo boundaries. The undo command treats the changes between two undo boundaries as a single step to be undone. If the value of the variable is t, undo information is not recorded. */); DEFVAR_PER_BUFFER ("mark-active", &BVAR (current_buffer, mark_active), Qnil, doc: /* Non-nil means the mark and region are currently active in this buffer. */); DEFVAR_PER_BUFFER ("cache-long-scans", &BVAR (current_buffer, cache_long_scans), Qnil, doc: /* Non-nil means that Emacs should use caches in attempt to speedup buffer scans. There is no reason to set this to nil except for debugging purposes. Normally, the line-motion functions work by scanning the buffer for newlines. Columnar operations (like `move-to-column' and `compute-motion') also work by scanning the buffer, summing character widths as they go. This works well for ordinary text, but if the buffer's lines are very long (say, more than 500 characters), these motion functions will take longer to execute. Emacs may also take longer to update the display. If `cache-long-scans' is non-nil, these motion functions cache the results of their scans, and consult the cache to avoid rescanning regions of the buffer until the text is modified. The caches are most beneficial when they prevent the most searching---that is, when the buffer contains long lines and large regions of characters with the same, fixed screen width. When `cache-long-scans' is non-nil, processing short lines will become slightly slower (because of the overhead of consulting the cache), and the caches will use memory roughly proportional to the number of newlines and characters whose screen width varies. Bidirectional editing also requires buffer scans to find paragraph separators. If you have large paragraphs or no paragraph separators at all, these scans may be slow. If `cache-long-scans' is non-nil, results of these scans are cached. This doesn't help too much if paragraphs are of the reasonable (few thousands of characters) size. The caches require no explicit maintenance; their accuracy is maintained internally by the Emacs primitives. Enabling or disabling the cache should not affect the behavior of any of the motion functions; it should only affect their performance. */); DEFVAR_PER_BUFFER ("point-before-scroll", &BVAR (current_buffer, point_before_scroll), Qnil, doc: /* Value of point before the last series of scroll operations, or nil. */); DEFVAR_PER_BUFFER ("buffer-file-format", &BVAR (current_buffer, file_format), Qnil, doc: /* List of formats to use when saving this buffer. Formats are defined by `format-alist'. This variable is set when a file is visited. */); DEFVAR_PER_BUFFER ("buffer-auto-save-file-format", &BVAR (current_buffer, auto_save_file_format), Qnil, doc: /* Format in which to write auto-save files. Should be a list of symbols naming formats that are defined in `format-alist'. If it is t, which is the default, auto-save files are written in the same format as a regular save would use. */); DEFVAR_PER_BUFFER ("buffer-invisibility-spec", &BVAR (current_buffer, invisibility_spec), Qnil, doc: /* Invisibility spec of this buffer. The default is t, which means that text is invisible if it has a non-nil `invisible' property. This variable can also be a list. The list can have two kinds of elements: `ATOM' and `(ATOM . ELLIPSIS)'. A text character is invisible if its `invisible' property is `ATOM', or has an `invisible' property that is a list that contains `ATOM'. If the `(ATOM . ELLIPSIS)' form is used, and `ELLIPSIS' is non-nil, an ellipsis will be displayed after the invisible characters. Setting this variable is very fast, much faster than scanning all the text in the buffer looking for properties to change. */); DEFVAR_PER_BUFFER ("buffer-display-count", &BVAR (current_buffer, display_count), Qintegerp, doc: /* A number incremented each time this buffer is displayed in a window. The function `set-window-buffer' increments it. */); DEFVAR_PER_BUFFER ("buffer-display-time", &BVAR (current_buffer, display_time), Qnil, doc: /* Time stamp updated each time this buffer is displayed in a window. The function `set-window-buffer' updates this variable to the value obtained by calling `current-time'. If the buffer has never been shown in a window, the value is nil. */); DEFVAR_LISP ("transient-mark-mode", Vtransient_mark_mode, doc: /* Non-nil if Transient Mark mode is enabled. See the command `transient-mark-mode' for a description of this minor mode. Non-nil also enables highlighting of the region whenever the mark is active. The region is highlighted with the `region' face. The variable `highlight-nonselected-windows' controls whether to highlight all windows or just the selected window. Lisp programs may give this variable certain special values: - The symbol `lambda' enables Transient Mark mode temporarily. The mode is disabled again after any subsequent action that would normally deactivate the mark (e.g. buffer modification). - The pair (only . OLDVAL) enables Transient Mark mode temporarily. After any subsequent point motion command that is not shift-translated, or any other action that would normally deactivate the mark (e.g. buffer modification), the value of `transient-mark-mode' is set to OLDVAL. */); Vtransient_mark_mode = Qnil; DEFVAR_LISP ("inhibit-read-only", Vinhibit_read_only, doc: /* Non-nil means disregard read-only status of buffers or characters. A non-nil value that is a list means disregard `buffer-read-only' status, and disregard a `read-only' text property if the property value is a member of the list. Any other non-nil value means disregard `buffer-read-only' and all `read-only' text properties. */); Vinhibit_read_only = Qnil; DEFVAR_PER_BUFFER ("cursor-type", &BVAR (current_buffer, cursor_type), Qnil, doc: /* Cursor to use when this buffer is in the selected window. Values are interpreted as follows: t use the cursor specified for the frame nil don't display a cursor box display a filled box cursor (box . SIZE) display a filled box cursor, but make it hollow if cursor is under masked image larger than SIZE pixels in either dimension. hollow display a hollow box cursor bar display a vertical bar cursor with default width (bar . WIDTH) display a vertical bar cursor with width WIDTH hbar display a horizontal bar cursor with default height (hbar . HEIGHT) display a horizontal bar cursor with height HEIGHT ANYTHING ELSE display a hollow box cursor WIDTH and HEIGHT can't exceed the frame's canonical character size. When the buffer is displayed in a non-selected window, the cursor's appearance is instead controlled by the variable `cursor-in-non-selected-windows'. */); DEFVAR_PER_BUFFER ("line-spacing", &BVAR (current_buffer, extra_line_spacing), Qnumberp, doc: /* Additional space to put between lines when displaying a buffer. The space is measured in pixels, and put below lines on graphic displays, see `display-graphic-p'. If value is a floating point number, it specifies the spacing relative to the default frame line height. A value of nil means add no extra space. */); DEFVAR_PER_BUFFER ("cursor-in-non-selected-windows", &BVAR (current_buffer, cursor_in_non_selected_windows), Qnil, doc: /* Non-nil means show a cursor in non-selected windows. If nil, only shows a cursor in the selected window. If t, displays a cursor related to the usual cursor type \(a solid box becomes hollow, a bar becomes a narrower bar). You can also specify the cursor type as in the `cursor-type' variable. Use Custom to set this variable and update the display. */); DEFVAR_LISP ("kill-buffer-query-functions", Vkill_buffer_query_functions, doc: /* List of functions called with no args to query before killing a buffer. The buffer being killed will be current while the functions are running. See `kill-buffer'. If any of them returns nil, the buffer is not killed. Functions run by this hook are supposed to not change the current buffer. This hook is not run for internal or temporary buffers created by `get-buffer-create' or `generate-new-buffer' with argument INHIBIT-BUFFER-HOOKS non-nil. */); Vkill_buffer_query_functions = Qnil; DEFVAR_LISP ("change-major-mode-hook", Vchange_major_mode_hook, doc: /* Normal hook run before changing the major mode of a buffer. The function `kill-all-local-variables' runs this before doing anything else. */); Vchange_major_mode_hook = Qnil; DEFSYM (Qchange_major_mode_hook, "change-major-mode-hook"); DEFVAR_LISP ("buffer-list-update-hook", Vbuffer_list_update_hook, doc: /* Hook run when the buffer list changes. Functions (implicitly) running this hook are `get-buffer-create', `make-indirect-buffer', `rename-buffer', `kill-buffer', `bury-buffer' and `select-window'. This hook is not run for internal or temporary buffers created by `get-buffer-create' or `generate-new-buffer' with argument INHIBIT-BUFFER-HOOKS non-nil. Functions run by this hook should avoid calling `select-window' with a nil NORECORD argument since it may lead to infinite recursion. */); Vbuffer_list_update_hook = Qnil; DEFSYM (Qbuffer_list_update_hook, "buffer-list-update-hook"); DEFVAR_BOOL ("kill-buffer-delete-auto-save-files", kill_buffer_delete_auto_save_files, doc: /* If non-nil, offer to delete any autosave file when killing a buffer. If `delete-auto-save-files' is nil, any autosave deletion is inhibited. */); kill_buffer_delete_auto_save_files = 0; DEFVAR_BOOL ("delete-auto-save-files", delete_auto_save_files, doc: /* Non-nil means delete auto-save file when a buffer is saved. This is the default. If nil, auto-save file deletion is inhibited. */); delete_auto_save_files = 1; DEFVAR_LISP ("clone-indirect-buffer-hook", Vclone_indirect_buffer_hook, doc: /* Normal hook to run in the new buffer at the end of `make-indirect-buffer'. Since `clone-indirect-buffer' calls `make-indirect-buffer', this hook will run for `clone-indirect-buffer' calls as well. */); Vclone_indirect_buffer_hook = Qnil; DEFVAR_LISP ("long-line-threshold", Vlong_line_threshold, doc: /* Line length above which to use redisplay shortcuts. The value should be a positive integer or nil. If the value is an integer, shortcuts in the display code intended to speed up redisplay for long lines will automatically be enabled in buffers which contain one or more lines whose length is above this threshold. If nil, these display shortcuts will always remain disabled. There is no reason to change that value except for debugging purposes. */); XSETFASTINT (Vlong_line_threshold, 50000); DEFVAR_INT ("long-line-locked-narrowing-region-size", long_line_locked_narrowing_region_size, doc: /* Region size for locked narrowing in buffers with long lines. This variable has effect only in buffers which contain one or more lines whose length is above `long-line-threshold', which see. For performance reasons, in such buffers, low-level hooks such as `fontification-functions' or `post-command-hook' are executed on a narrowed buffer, with a narrowing locked with `narrowing-lock'. This variable specifies the size of the narrowed region around point. To disable that narrowing, set this variable to 0. See also `long-line-locked-narrowing-bol-search-limit'. There is no reason to change that value except for debugging purposes. */); long_line_locked_narrowing_region_size = 500000; DEFVAR_INT ("long-line-locked-narrowing-bol-search-limit", long_line_locked_narrowing_bol_search_limit, doc: /* Limit for beginning of line search in buffers with long lines. This variable has effect only in buffers which contain one or more lines whose length is above `long-line-threshold', which see. For performance reasons, in such buffers, low-level hooks such as `fontification-functions' or `post-command-hook' are executed on a narrowed buffer, with a narrowing locked with `narrowing-lock'. The variable `long-line-locked-narrowing-region-size' specifies the size of the narrowed region around point. This variable, which should be a small integer, specifies the number of characters by which that region can be extended backwards to make it start at the beginning of a line. There is no reason to change that value except for debugging purposes. */); long_line_locked_narrowing_bol_search_limit = 128; DEFVAR_INT ("large-hscroll-threshold", large_hscroll_threshold, doc: /* Horizontal scroll of truncated lines above which to use redisplay shortcuts. The value should be a positive integer. Shortcuts in the display code intended to speed up redisplay for long and truncated lines will automatically be enabled when a line's horizontal scroll amount is or about to become larger than the value of this variable. This variable has effect only in buffers which contain one or more lines whose length is above `long-line-threshold', which see. To disable redisplay shortcuts for long truncated line, set this variable to `most-positive-fixnum'. There is no reason to change that value except for debugging purposes. */); large_hscroll_threshold = 10000; defsubr (&Sbuffer_live_p); defsubr (&Sbuffer_list); defsubr (&Sget_buffer); defsubr (&Sget_file_buffer); defsubr (&Sget_buffer_create); defsubr (&Smake_indirect_buffer); defsubr (&Sgenerate_new_buffer_name); defsubr (&Sbuffer_name); defsubr (&Sbuffer_file_name); defsubr (&Sbuffer_base_buffer); defsubr (&Sbuffer_local_value); defsubr (&Sbuffer_local_variables); defsubr (&Sbuffer_modified_p); defsubr (&Sforce_mode_line_update); defsubr (&Sset_buffer_modified_p); defsubr (&Sbuffer_modified_tick); defsubr (&Sinternal__set_buffer_modified_tick); defsubr (&Sbuffer_chars_modified_tick); defsubr (&Srename_buffer); defsubr (&Sother_buffer); defsubr (&Sbuffer_enable_undo); defsubr (&Skill_buffer); defsubr (&Sbury_buffer_internal); defsubr (&Sset_buffer_major_mode); defsubr (&Scurrent_buffer); defsubr (&Sset_buffer); defsubr (&Sbarf_if_buffer_read_only); defsubr (&Serase_buffer); defsubr (&Sbuffer_swap_text); defsubr (&Sset_buffer_multibyte); defsubr (&Skill_all_local_variables); defsubr (&Soverlayp); defsubr (&Smake_overlay); defsubr (&Sdelete_overlay); defsubr (&Sdelete_all_overlays); defsubr (&Smove_overlay); defsubr (&Soverlay_start); defsubr (&Soverlay_end); defsubr (&Soverlay_buffer); defsubr (&Soverlay_properties); defsubr (&Soverlays_at); defsubr (&Soverlays_in); defsubr (&Snext_overlay_change); defsubr (&Sprevious_overlay_change); defsubr (&Soverlay_recenter); defsubr (&Soverlay_lists); defsubr (&Soverlay_get); defsubr (&Soverlay_put); defsubr (&Srestore_buffer_modified_p); DEFSYM (Qautosaved, "autosaved"); #ifdef ITREE_DEBUG defsubr (&Soverlay_tree); #endif DEFSYM (Qkill_buffer__possibly_save, "kill-buffer--possibly-save"); DEFSYM (Qbuffer_stale_function, "buffer-stale-function"); Fput (intern_c_string ("erase-buffer"), Qdisabled, Qt); }