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- /* Header file for the buffer manipulation primitives.
- Copyright (C) 1985, 1986, 1993 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 2, 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; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-
- #ifdef USE_TEXT_PROPERTIES
- #define SET_PT(position) (set_point ((position), current_buffer))
- #define TEMP_SET_PT(position) (temp_set_point ((position), current_buffer))
-
- #define BUF_SET_PT(buffer, position) (set_point ((position), (buffer)))
- #define BUF_TEMP_SET_PT(buffer, position) (temp_set_point ((position), (buffer)))
-
- #else /* don't support text properties */
-
- #define SET_PT(position) (current_buffer->text.pt = (position))
- #define TEMP_SET_PT(position) (current_buffer->text.pt = (position))
-
- #define BUF_SET_PT(buffer, position) (buffer->text.pt = (position))
- #define BUF_TEMP_SET_PT(buffer, position) (buffer->text.pt = (position))
- #endif /* don't support text properties */
-
- /* Character position of beginning of buffer. */
- #define BEG (1)
-
- /* Character position of beginning of accessible range of buffer. */
- #define BEGV (current_buffer->text.begv)
-
- /* Character position of point in buffer. The "+ 0" makes this
- not an l-value, so you can't assign to it. Use SET_PT instead. */
- #define PT (current_buffer->text.pt + 0)
-
- /* Character position of gap in buffer. */
- #define GPT (current_buffer->text.gpt)
-
- /* Character position of end of accessible range of buffer. */
- #define ZV (current_buffer->text.zv)
-
- /* Character position of end of buffer. */
- #define Z (current_buffer->text.z)
-
- /* Is the current buffer narrowed? */
- #define NARROWED ((BEGV != BEG) || (ZV != Z))
-
- /* Modification count. */
- #define MODIFF (current_buffer->text.modiff)
-
- /* Address of beginning of buffer. */
- #define BEG_ADDR (current_buffer->text.beg)
-
- /* Address of beginning of accessible range of buffer. */
- #define BEGV_ADDR (&FETCH_CHAR (current_buffer->text.begv))
-
- /* Address of point in buffer. */
- #define PT_ADDR (&FETCH_CHAR (current_buffer->text.pt))
-
- /* Address of beginning of gap in buffer. */
- #define GPT_ADDR (current_buffer->text.beg + current_buffer->text.gpt - 1)
-
- /* Address of end of gap in buffer. */
- #define GAP_END_ADDR (current_buffer->text.beg + current_buffer->text.gpt + current_buffer->text.gap_size - 1)
-
- /* Address of end of accessible range of buffer. */
- #define ZV_ADDR (&FETCH_CHAR (current_buffer->text.zv))
-
- /* Size of gap. */
- #define GAP_SIZE (current_buffer->text.gap_size)
-
- /* Now similar macros for a specified buffer.
- Note that many of these evaluate the buffer argument more than once. */
-
- /* Character position of beginning of buffer. */
- #define BUF_BEG(buf) (1)
-
- /* Character position of beginning of accessible range of buffer. */
- #define BUF_BEGV(buf) ((buf)->text.begv)
-
- /* Character position of point in buffer. */
- #define BUF_PT(buf) ((buf)->text.pt)
-
- /* Character position of gap in buffer. */
- #define BUF_GPT(buf) ((buf)->text.gpt)
-
- /* Character position of end of accessible range of buffer. */
- #define BUF_ZV(buf) ((buf)->text.zv)
-
- /* Character position of end of buffer. */
- #define BUF_Z(buf) ((buf)->text.z)
-
- /* Is this buffer narrowed? */
- #define BUF_NARROWED(buf) ((BUF_BEGV(buf) != BUF_BEG(buf)) \
- || (BUF_ZV(buf) != BUF_Z(buf)))
-
- /* Modification count. */
- #define BUF_MODIFF(buf) ((buf)->text.modiff)
-
- /* Address of beginning of buffer. */
- #define BUF_BEG_ADDR(buf) ((buf)->text.beg)
-
- /* Macro for setting the value of BUF_ZV (BUF) to VALUE,
- by varying the end of the accessible region. */
- #define SET_BUF_ZV(buf, value) ((buf)->text.zv = (value))
- #define SET_BUF_PT(buf, value) ((buf)->text.pt = (value))
-
- /* Size of gap. */
- #define BUF_GAP_SIZE(buf) ((buf)->text.gap_size)
-
- /* Return the address of character at position POS in buffer BUF.
- Note that both arguments can be computed more than once. */
- #define BUF_CHAR_ADDRESS(buf, pos) \
- ((buf)->text.beg + (pos) - 1 \
- + ((pos) >= (buf)->text.gpt ? (buf)->text.gap_size : 0))
-
- /* Convert the address of a char in the buffer into a character position. */
- #define PTR_CHAR_POS(ptr) \
- ((ptr) - (current_buffer)->text.beg \
- - (ptr - (current_buffer)->text.beg < (unsigned) GPT ? 0 : GAP_SIZE) \
- + 1)
-
- struct buffer_text
- {
- unsigned char *beg; /* Actual address of buffer contents. */
- int begv; /* Index of beginning of accessible range. */
- int pt; /* Position of point in buffer. */
- int gpt; /* Index of gap in buffer. */
- int zv; /* Index of end of accessible range. */
- int z; /* Index of end of buffer. */
- int gap_size; /* Size of buffer's gap */
- int modiff; /* This counts buffer-modification events
- for this buffer. It is incremented for
- each such event, and never otherwise
- changed. */
- };
-
- struct buffer
- {
- /* Everything before the `name' slot must be of a non-Lisp_Object type,
- and every slot after `name' must be a Lisp_Object.
-
- Check out mark_buffer (alloc.c) to see why.
- */
-
- /* This structure holds the coordinates of the buffer contents. */
- struct buffer_text text;
- /* Next buffer, in chain of all buffers including killed buffers.
- This chain is used only for garbage collection, in order to
- collect killed buffers properly. */
- struct buffer *next;
- /* Flags saying which DEFVAR_PER_BUFFER variables
- are local to this buffer. */
- int local_var_flags;
- /* Value of text.modiff as of when visited file was read or written. */
- int save_modified;
- /* Set to the modtime of the visited file when read or written.
- -1 means visited file was nonexistent.
- 0 means visited file modtime unknown; in no case complain
- about any mismatch on next save attempt. */
- int modtime;
- /* the value of text.modiff at the last auto-save. */
- int auto_save_modified;
- /* Position in buffer at which display started
- the last time this buffer was displayed */
- int last_window_start;
-
- /* Properties of this buffer's text -- conditionally compiled. */
- DECLARE_INTERVALS
-
- /* This is a special exception -- as this slot should not be
- marked by gc_sweep, and as it is not lisp-accessible as
- a local variable -- so we regard it as not really being of type
- Lisp_Object */
- /* the markers that refer to this buffer.
- This is actually a single marker ---
- successive elements in its marker `chain'
- are the other markers referring to this
- buffer */
- Lisp_Object markers;
-
-
- /* Everything from here down must be a Lisp_Object */
-
-
- /* the name of this buffer */
- Lisp_Object name;
- /* Nuked: buffer number, assigned when buffer made Lisp_Object number;*/
- /* the name of the file associated with this buffer */
- Lisp_Object filename;
- /* Dir for expanding relative pathnames */
- Lisp_Object directory;
- /* true iff this buffer has been been backed
- up (if you write to its associated file
- and it hasn't been backed up, then a
- backup will be made) */
- /* This isn't really used by the C code, so could be deleted. */
- Lisp_Object backed_up;
- /* Length of file when last read or saved. */
- Lisp_Object save_length;
- /* file name used for auto-saving this buffer */
- Lisp_Object auto_save_file_name;
- /* Non-nil if buffer read-only */
- Lisp_Object read_only;
- /* "The mark"; no longer allowed to be nil */
- Lisp_Object mark;
-
- /* Alist of elements (SYMBOL . VALUE-IN-THIS-BUFFER)
- for all per-buffer variables of this buffer. */
- Lisp_Object local_var_alist;
-
-
- /* Symbol naming major mode (eg lisp-mode) */
- Lisp_Object major_mode;
- /* Pretty name of major mode (eg "Lisp") */
- Lisp_Object mode_name;
- /* Format string for mode line */
- Lisp_Object mode_line_format;
-
- /* Keys that are bound local to this buffer */
- Lisp_Object keymap;
- /* This buffer's local abbrev table */
- Lisp_Object abbrev_table;
- /* This buffer's syntax table. */
- Lisp_Object syntax_table;
-
- /* Values of several buffer-local variables */
- /* tab-width is buffer-local so that redisplay can find it
- in buffers that are not current */
- Lisp_Object case_fold_search;
- Lisp_Object tab_width;
- Lisp_Object fill_column;
- Lisp_Object left_margin;
- /* Function to call when insert space past fill column */
- Lisp_Object auto_fill_function;
-
- /* String of length 256 mapping each char to its lower-case version. */
- Lisp_Object downcase_table;
- /* String of length 256 mapping each char to its upper-case version. */
- Lisp_Object upcase_table;
-
- /* Non-nil means do not display continuation lines */
- Lisp_Object truncate_lines;
- /* Non-nil means display ctl chars with uparrow */
- Lisp_Object ctl_arrow;
- /* Non-nil means do selective display;
- See doc string in syms_of_buffer (buffer.c) for details. */
- Lisp_Object selective_display;
- #ifndef old
- /* Non-nil means show ... at end of line followed by invisible lines. */
- Lisp_Object selective_display_ellipses;
- #endif
- /* Alist of (FUNCTION . STRING) for each minor mode enabled in buffer. */
- Lisp_Object minor_modes;
- /* t if "self-insertion" should overwrite; `binary' if it should also
- overwrite newlines and tabs - for editing executables and the like. */
- Lisp_Object overwrite_mode;
- /* non-nil means abbrev mode is on. Expand abbrevs automatically. */
- Lisp_Object abbrev_mode;
- /* Display table to use for text in this buffer. */
- Lisp_Object display_table;
- /* Translate table for case-folding search. */
- Lisp_Object case_canon_table;
- /* Inverse translate (equivalence class) table for case-folding search. */
- Lisp_Object case_eqv_table;
- /* Changes in the buffer are recorded here for undo.
- t means don't record anything. */
- Lisp_Object undo_list;
- /* t means the mark and region are currently active. */
- Lisp_Object mark_active;
-
- /* List of overlays that end at or before the current center,
- in order of end-position. */
- Lisp_Object overlays_before;
-
- /* List of overlays that end after the current center,
- in order of start-position. */
- Lisp_Object overlays_after;
-
- /* Position where the overlay lists are centered. */
- Lisp_Object overlay_center;
- };
-
- /* This points to the current buffer. */
-
- extern struct buffer *current_buffer;
-
- /* This structure holds the default values of the buffer-local variables
- 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. */
-
- extern struct buffer buffer_defaults;
-
- /* This structure marks which slots in a buffer have corresponding
- default values in buffer_defaults.
- Each such slot has a nonzero value in this structure.
- The value has only one nonzero bit.
-
- When a buffer has its own local value for a slot,
- the bit for that slot (found in the same slot in this structure)
- is turned on in the buffer's local_var_flags slot.
-
- If a slot in this structure is zero, then even though there may
- be a Lisp-level local variable for the slot, it has no default value,
- and the corresponding slot in buffer_defaults is not used. */
-
- extern struct buffer buffer_local_flags;
-
- /* For each buffer slot, this points to the Lisp symbol name
- for that slot in the current buffer. It is 0 for slots
- that don't have such names. */
-
- extern struct buffer buffer_local_symbols;
-
- /* This structure holds the required types for the values in the
- buffer-local slots. If a slot contains Qnil, then the
- corresponding buffer slot may contain a value of any type. If a
- slot contains an integer, then prospective values' tags must be
- equal to that integer. When a tag does not match, the function
- buffer_slot_type_mismatch will signal an error. The value Qnil may
- always be safely stored in any slot. */
- extern struct buffer buffer_local_types;
-
- /* Point in the current buffer. This is an obsolete alias
- and should be eliminated. */
- #define point (current_buffer->text.pt + 0)
-
- /* Return character at position n. No range checking. */
- #define FETCH_CHAR(n) *(((n)>= GPT ? GAP_SIZE : 0) + (n) + BEG_ADDR - 1)
-
- /* BUFFER_CEILING_OF (resp. BUFFER_FLOOR_OF), when applied to n, return
- the max (resp. min) p such that
-
- &FETCH_CHAR (p) - &FETCH_CHAR (n) == p - n */
-
- #define BUFFER_CEILING_OF(n) (((n) < GPT && GPT < ZV ? GPT : ZV) - 1)
- #define BUFFER_FLOOR_OF(n) (BEGV <= GPT && GPT <= (n) ? GPT : BEGV)
-
- extern void reset_buffer ();
-
- extern Lisp_Object Fbuffer_name ();
- extern Lisp_Object Fget_file_buffer ();
-
- /* Functions to call before and after each text change. */
- extern Lisp_Object Vbefore_change_function;
- extern Lisp_Object Vafter_change_function;
- extern Lisp_Object Vfirst_change_hook;
- extern Lisp_Object Qfirst_change_hook;
-
- extern Lisp_Object Vdeactivate_mark;
- extern Lisp_Object Vtransient_mark_mode;
-
- /* Overlays */
-
- /* Overlays are ordinary Lisp objects, and users can alter their contents.
- Therefore, we cannot assume that they remain valid--we must check. */
-
- /* 1 if the OV is a cons cell whose car is a cons cell. */
- #define OVERLAY_VALID(OV) (OVERLAYP (OV))
-
- /* Return the marker that stands for where OV starts in the buffer. */
- #define OVERLAY_START(OV) (XCONS (XCONS ((OV))->car)->car)
-
- /* Return the marker that stands for where OV ends in the buffer. */
- #define OVERLAY_END(OV) (XCONS (XCONS ((OV))->car)->cdr)
-
- /* Return the actual buffer position for the marker P,
- if it is a marker and points into the current buffer.
- Otherwise, zero. */
-
- #define OVERLAY_POSITION(P) \
- ((MARKERP ((P)) && XMARKER ((P))->buffer == current_buffer) \
- ? marker_position ((P)) : 0)
-
- /* Allocation of buffer text. */
-
- #ifdef REL_ALLOC
- #define BUFFER_ALLOC(data,size) ((unsigned char *) r_alloc (&data, (size)))
- #define BUFFER_REALLOC(data,size) ((unsigned char *) r_re_alloc (&data, (size)))
- #define BUFFER_FREE(data) (r_alloc_free (&data))
- #define R_ALLOC_DECLARE(var,data) (r_alloc_declare (&var, (data)))
- #else
- #define BUFFER_ALLOC(data,size) (data = (unsigned char *) malloc ((size)))
- #define BUFFER_REALLOC(data,size) ((unsigned char *) realloc ((data), (size)))
- #define BUFFER_FREE(data) (free ((data)))
- #define R_ALLOC_DECLARE(var,data)
- #endif
-