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[Emacs-diffs] Changes to emacs/src/buffer.h [emacs-unicode-2]
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From: |
Kenichi Handa |
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Subject: |
[Emacs-diffs] Changes to emacs/src/buffer.h [emacs-unicode-2] |
|
Date: |
Mon, 08 Sep 2003 08:48:25 -0400 |
Index: emacs/src/buffer.h
diff -c /dev/null emacs/src/buffer.h:1.94.2.1
*** /dev/null Mon Sep 8 08:48:25 2003
--- emacs/src/buffer.h Mon Sep 8 08:48:09 2003
***************
*** 0 ****
--- 1,942 ----
+ /* Header file for the buffer manipulation primitives.
+ Copyright (C) 1985, 86, 93, 94, 95, 97, 1998, 1999, 2000, 01, 2003
+ 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, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+
+ /* Accessing the parameters of the current buffer. */
+
+ /* These macros come in pairs, one for the char position
+ and one for the byte position. */
+
+ /* Position of beginning of buffer. */
+ #define BEG (1)
+ #define BEG_BYTE (BEG)
+
+ /* Position of beginning of accessible range of buffer. */
+ #define BEGV (current_buffer->begv)
+ #define BEGV_BYTE (current_buffer->begv_byte)
+
+ /* 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->pt + 0)
+ #define PT_BYTE (current_buffer->pt_byte + 0)
+
+ /* Position of gap in buffer. */
+ #define GPT (current_buffer->text->gpt)
+ #define GPT_BYTE (current_buffer->text->gpt_byte)
+
+ /* Position of end of accessible range of buffer. */
+ #define ZV (current_buffer->zv)
+ #define ZV_BYTE (current_buffer->zv_byte)
+
+ /* Position of end of buffer. */
+ #define Z (current_buffer->text->z)
+ #define Z_BYTE (current_buffer->text->z_byte)
+
+ /* Macros for the addresses of places in the buffer. */
+
+ /* Address of beginning of buffer. */
+ #define BEG_ADDR (current_buffer->text->beg)
+
+ /* Address of beginning of accessible range of buffer. */
+ #define BEGV_ADDR (BYTE_POS_ADDR (current_buffer->begv_byte))
+
+ /* Address of point in buffer. */
+ #define PT_ADDR (BYTE_POS_ADDR (current_buffer->pt_byte))
+
+ /* Address of beginning of gap in buffer. */
+ #define GPT_ADDR (current_buffer->text->beg + current_buffer->text->gpt_byte
- BEG_BYTE)
+
+ /* Address of end of gap in buffer. */
+ #define GAP_END_ADDR (current_buffer->text->beg +
current_buffer->text->gpt_byte + current_buffer->text->gap_size - BEG_BYTE)
+
+ /* Address of end of accessible range of buffer. */
+ #define ZV_ADDR (BYTE_POS_ADDR (current_buffer->zv_byte))
+
+ /* Address of end of buffer. */
+ #define Z_ADDR (current_buffer->text->beg + current_buffer->text->gap_size +
current_buffer->text->z_byte - BEG_BYTE)
+
+ /* Size of gap. */
+ #define GAP_SIZE (current_buffer->text->gap_size)
+
+ /* Is the current buffer narrowed? */
+ #define NARROWED ((BEGV != BEG) || (ZV != Z))
+
+ /* Modification count. */
+ #define MODIFF (current_buffer->text->modiff)
+
+ /* Overlay modification count. */
+ #define OVERLAY_MODIFF (current_buffer->text->overlay_modiff)
+
+ /* Modification count as of last visit or save. */
+ #define SAVE_MODIFF (current_buffer->text->save_modiff)
+
+ /* BUFFER_CEILING_OF (resp. BUFFER_FLOOR_OF), when applied to n, return
+ the max (resp. min) p such that
+
+ BYTE_POS_ADDR (p) - BYTE_POS_ADDR (n) == p - n */
+
+ #define BUFFER_CEILING_OF(BYTEPOS) \
+ (((BYTEPOS) < GPT_BYTE && GPT < ZV ? GPT_BYTE : ZV_BYTE) - 1)
+ #define BUFFER_FLOOR_OF(BYTEPOS) \
+ (BEGV <= GPT && GPT_BYTE <= (BYTEPOS) ? GPT_BYTE : BEGV_BYTE)
+
+ /* Similar macros to operate on a specified buffer.
+ Note that many of these evaluate the buffer argument more than once. */
+
+ /* Position of beginning of buffer. */
+ #define BUF_BEG(buf) (BEG)
+ #define BUF_BEG_BYTE(buf) (BEG_BYTE)
+
+ /* Position of beginning of accessible range of buffer. */
+ #define BUF_BEGV(buf) ((buf)->begv)
+ #define BUF_BEGV_BYTE(buf) ((buf)->begv_byte)
+
+ /* Position of point in buffer. */
+ #define BUF_PT(buf) ((buf)->pt)
+ #define BUF_PT_BYTE(buf) ((buf)->pt_byte)
+
+ /* Position of gap in buffer. */
+ #define BUF_GPT(buf) ((buf)->text->gpt)
+ #define BUF_GPT_BYTE(buf) ((buf)->text->gpt_byte)
+
+ /* Position of end of accessible range of buffer. */
+ #define BUF_ZV(buf) ((buf)->zv)
+ #define BUF_ZV_BYTE(buf) ((buf)->zv_byte)
+
+ /* Position of end of buffer. */
+ #define BUF_Z(buf) ((buf)->text->z)
+ #define BUF_Z_BYTE(buf) ((buf)->text->z_byte)
+
+ /* Address of beginning of buffer. */
+ #define BUF_BEG_ADDR(buf) ((buf)->text->beg)
+
+ /* Address of beginning of gap of buffer. */
+ #define BUF_GPT_ADDR(buf) ((buf)->text->beg + (buf)->text->gpt_byte -
BEG_BYTE)
+
+ /* Address of end of buffer. */
+ #define BUF_Z_ADDR(buf) ((buf)->text->beg + (buf)->text->gap_size +
(buf)->text->z_byte - BEG_BYTE)
+
+ /* Address of end of gap in buffer. */
+ #define BUF_GAP_END_ADDR(buf) ((buf)->text->beg + (buf)->text->gpt_byte +
(buf)->text->gap_size - BEG_BYTE)
+
+ /* Size of gap. */
+ #define BUF_GAP_SIZE(buf) ((buf)->text->gap_size)
+
+ /* 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)
+
+ /* Modification count as of last visit or save. */
+ #define BUF_SAVE_MODIFF(buf) ((buf)->text->save_modiff)
+
+ /* Overlay modification count. */
+ #define BUF_OVERLAY_MODIFF(buf) ((buf)->text->overlay_modiff)
+
+ /* Interval tree of buffer. */
+ #define BUF_INTERVALS(buf) ((buf)->text->intervals)
+
+ /* Marker chain of buffer. */
+ #define BUF_MARKERS(buf) ((buf)->text->markers)
+
+ #define BUF_UNCHANGED_MODIFIED(buf) \
+ ((buf)->text->unchanged_modified)
+
+ #define BUF_OVERLAY_UNCHANGED_MODIFIED(buf) \
+ ((buf)->text->overlay_unchanged_modified)
+ #define BUF_BEG_UNCHANGED(buf) ((buf)->text->beg_unchanged)
+ #define BUF_END_UNCHANGED(buf) ((buf)->text->end_unchanged)
+
+ #define UNCHANGED_MODIFIED \
+ BUF_UNCHANGED_MODIFIED (current_buffer)
+ #define OVERLAY_UNCHANGED_MODIFIED \
+ BUF_OVERLAY_UNCHANGED_MODIFIED (current_buffer)
+ #define BEG_UNCHANGED BUF_BEG_UNCHANGED (current_buffer)
+ #define END_UNCHANGED BUF_END_UNCHANGED (current_buffer)
+
+ /* Compute how many characters at the top and bottom of BUF are
+ unchanged when the range START..END is modified. This computation
+ must be done each time BUF is modified. */
+
+ #define BUF_COMPUTE_UNCHANGED(buf, start, end)
\
+ do \
+ { \
+ if (BUF_UNCHANGED_MODIFIED (buf) == BUF_MODIFF (buf) \
+ && (BUF_OVERLAY_UNCHANGED_MODIFIED (buf) \
+ == BUF_OVERLAY_MODIFF (buf))) \
+ { \
+ BUF_BEG_UNCHANGED (buf) = (start) - BUF_BEG (buf); \
+ BUF_END_UNCHANGED (buf) = BUF_Z (buf) - (end); \
+ } \
+ else \
+ { \
+ if (BUF_Z (buf) - (end) < BUF_END_UNCHANGED (buf)) \
+ BUF_END_UNCHANGED (buf) = BUF_Z (buf) - (end); \
+ if ((start) - BUF_BEG (buf) < BUF_BEG_UNCHANGED (buf)) \
+ BUF_BEG_UNCHANGED (buf) = (start) - BUF_BEG (buf); \
+ } \
+ } \
+ while (0)
+
+
+ /* Macros to set PT in the current buffer, or another buffer. */
+
+ #define SET_PT(position) (set_point (current_buffer, (position)))
+ #define TEMP_SET_PT(position) (temp_set_point (current_buffer, (position)))
+
+ #define SET_PT_BOTH(position, byte) \
+ (set_point_both (current_buffer, (position), (byte)))
+ #define TEMP_SET_PT_BOTH(position, byte) \
+ (temp_set_point_both (current_buffer, (position), (byte)))
+
+ #define BUF_SET_PT(buffer, position) \
+ (set_point ((buffer), (position)))
+ #define BUF_TEMP_SET_PT(buffer, position) \
+ (temp_set_point ((buffer), (position)))
+
+ extern void set_point P_ ((struct buffer *, int));
+ extern INLINE void temp_set_point P_ ((struct buffer *, int));
+ extern void set_point_both P_ ((struct buffer *, int, int));
+ extern INLINE void temp_set_point_both P_ ((struct buffer *, int, int));
+ extern void enlarge_buffer_text P_ ((struct buffer *, int));
+
+
+ /* Macros for setting the BEGV, ZV or PT of a given buffer.
+
+ SET_BUF_PT* seet to be redundant. Get rid of them?
+
+ The ..._BOTH macros take both a charpos and a bytepos,
+ which must correspond to each other.
+
+ The macros without ..._BOTH take just a charpos,
+ and compute the bytepos from it. */
+
+ #define SET_BUF_BEGV(buf, charpos) \
+ ((buf)->begv_byte = buf_charpos_to_bytepos ((buf), (charpos)), \
+ (buf)->begv = (charpos))
+
+ #define SET_BUF_ZV(buf, charpos) \
+ ((buf)->zv_byte = buf_charpos_to_bytepos ((buf), (charpos)), \
+ (buf)->zv = (charpos))
+
+ #define SET_BUF_BEGV_BOTH(buf, charpos, byte) \
+ ((buf)->begv = (charpos), \
+ (buf)->begv_byte = (byte))
+
+ #define SET_BUF_ZV_BOTH(buf, charpos, byte) \
+ ((buf)->zv = (charpos), \
+ (buf)->zv_byte = (byte))
+
+ #define SET_BUF_PT_BOTH(buf, charpos, byte) \
+ ((buf)->pt = (charpos), \
+ (buf)->pt_byte = (byte))
+
+ /* Macros to access a character or byte in the current buffer,
+ or convert between a byte position and an address.
+ These macros do not check that the position is in range. */
+
+ /* Access a Lisp position value in POS,
+ and store the charpos in CHARPOS and the bytepos in BYTEPOS. */
+
+ #define DECODE_POSITION(charpos, bytepos, pos) \
+ if (1) \
+ { \
+ Lisp_Object __pos = (pos); \
+ if (NUMBERP (__pos)) \
+ { \
+ charpos = __pos; \
+ bytepos = buf_charpos_to_bytepos (current_buffer, __pos); \
+ } \
+ else if (MARKERP (__pos)) \
+ { \
+ charpos = marker_position (__pos); \
+ bytepos = marker_byte_position (__pos); \
+ } \
+ else \
+ wrong_type_argument (Qinteger_or_marker_p, __pos); \
+ } \
+ else
+
+ /* Return the address of byte position N in current buffer. */
+
+ #define BYTE_POS_ADDR(n) \
+ (((n) >= GPT_BYTE ? GAP_SIZE : 0) + (n) + BEG_ADDR - BEG_BYTE)
+
+ /* Return the address of char position N. */
+
+ #define CHAR_POS_ADDR(n) \
+ (((n) >= GPT ? GAP_SIZE : 0) \
+ + buf_charpos_to_bytepos (current_buffer, n) \
+ + BEG_ADDR - BEG_BYTE)
+
+ /* Convert a character position to a byte position. */
+
+ #define CHAR_TO_BYTE(charpos) \
+ (buf_charpos_to_bytepos (current_buffer, charpos))
+
+ /* Convert a byte position to a character position. */
+
+ #define BYTE_TO_CHAR(bytepos) \
+ (buf_bytepos_to_charpos (current_buffer, bytepos))
+
+ /* Convert PTR, the address of a byte in the buffer, into a byte position. */
+
+ #define PTR_BYTE_POS(ptr) \
+ ((ptr) - (current_buffer)->text->beg \
+ - (ptr - (current_buffer)->text->beg <= (unsigned) (GPT_BYTE - BEG_BYTE) ? 0
: GAP_SIZE) \
+ + BEG_BYTE)
+
+ /* Return character at position POS. */
+
+ #define FETCH_CHAR(pos) \
+ (!NILP (current_buffer->enable_multibyte_characters) \
+ ? FETCH_MULTIBYTE_CHAR ((pos)) \
+ : FETCH_BYTE ((pos)))
+
+ /* Return the byte at byte position N. */
+
+ #define FETCH_BYTE(n) *(BYTE_POS_ADDR ((n)))
+
+ /* Variables used locally in FETCH_MULTIBYTE_CHAR. */
+ extern unsigned char *_fetch_multibyte_char_p;
+
+ /* Return character code of multi-byte form at position POS. If POS
+ doesn't point the head of valid multi-byte form, only the byte at
+ POS is returned. No range checking. */
+
+ #define FETCH_MULTIBYTE_CHAR(pos) \
+ (_fetch_multibyte_char_p = (((pos) >= GPT_BYTE ? GAP_SIZE : 0) \
+ + (pos) + BEG_ADDR - BEG_BYTE), \
+ STRING_CHAR (_fetch_multibyte_char_p, 0))
+
+ /* Return character at position POS. If the current buffer is unibyte
+ and the character is not ASCII, make the returning character
+ multibyte. */
+
+ #define FETCH_CHAR_AS_MULTIBYTE(pos) \
+ (!NILP (current_buffer->enable_multibyte_characters) \
+ ? FETCH_MULTIBYTE_CHAR ((pos)) \
+ : unibyte_char_to_multibyte (FETCH_BYTE ((pos))))
+
+
+ /* Macros for accessing a character or byte,
+ or converting between byte positions and addresses,
+ in a specified buffer. */
+
+ /* Return the address of character at byte position POS in buffer BUF.
+ Note that both arguments can be computed more than once. */
+
+ #define BUF_BYTE_ADDRESS(buf, pos) \
+ ((buf)->text->beg + (pos) - BEG_BYTE \
+ + ((pos) >= (buf)->text->gpt_byte ? (buf)->text->gap_size : 0))
+
+ /* Return the address of character at char position POS in buffer BUF.
+ Note that both arguments can be computed more than once. */
+
+ #define BUF_CHAR_ADDRESS(buf, pos) \
+ ((buf)->text->beg + buf_charpos_to_bytepos ((buf), (pos)) - BEG_BYTE \
+ + ((pos) >= (buf)->text->gpt ? (buf)->text->gap_size : 0))
+
+ /* Convert PTR, the address of a char in buffer BUF,
+ into a character position. */
+
+ #define BUF_PTR_BYTE_POS(buf, ptr) \
+ ((ptr) - (buf)->text->beg \
+ - (ptr - (buf)->text->beg <= (unsigned) (BUF_GPT_BYTE ((buf)) - BEG_BYTE)\
+ ? 0 : BUF_GAP_SIZE ((buf))) \
+ + BEG_BYTE)
+
+ /* Return the character at byte position POS in buffer BUF. */
+
+ #define BUF_FETCH_CHAR(buf, pos) \
+ (!NILP (buf->enable_multibyte_characters) \
+ ? BUF_FETCH_MULTIBYTE_CHAR ((buf), (pos)) \
+ : BUF_FETCH_BYTE ((buf), (pos)))
+
+ /* Return the byte at byte position N in buffer BUF. */
+
+ #define BUF_FETCH_BYTE(buf, n) \
+ *(BUF_BYTE_ADDRESS ((buf), (n)))
+
+ /* Return character code of multi-byte form at byte position POS in BUF.
+ If POS doesn't point the head of valid multi-byte form, only the byte at
+ POS is returned. No range checking. */
+
+ #define BUF_FETCH_MULTIBYTE_CHAR(buf, pos) \
+ (_fetch_multibyte_char_p \
+ = (((pos) >= BUF_GPT_BYTE (buf) ? BUF_GAP_SIZE (buf) : 0)
\
+ + (pos) + BUF_BEG_ADDR (buf) - BEG_BYTE), \
+ STRING_CHAR (_fetch_multibyte_char_p, 0))
+
+ /* Define the actual buffer data structures. */
+
+ /* This data structure describes the actual text contents of a buffer.
+ It is shared between indirect buffers and their base buffer. */
+
+ struct buffer_text
+ {
+ /* Actual address of buffer contents. If REL_ALLOC is defined,
+ this address might change when blocks are relocated which can
+ e.g. happen when malloc is called. So, don't pass a pointer
+ into a buffer's text to functions that malloc. */
+ unsigned char *beg;
+
+ EMACS_INT gpt; /* Char pos of gap in buffer. */
+ EMACS_INT z; /* Char pos of end of buffer. */
+ EMACS_INT gpt_byte; /* Byte pos of gap in buffer. */
+ EMACS_INT z_byte; /* Byte pos of end of buffer. */
+ EMACS_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. */
+ int save_modiff; /* Previous value of modiff, as of last
+ time buffer visited or saved a file. */
+
+ int overlay_modiff; /* Counts modifications to overlays. */
+
+ /* Minimum value of GPT - BEG since last redisplay that finished. */
+ EMACS_INT beg_unchanged;
+
+ /* Minimum value of Z - GPT since last redisplay that finished. */
+ EMACS_INT end_unchanged;
+
+ /* MODIFF as of last redisplay that finished; if it matches MODIFF,
+ beg_unchanged and end_unchanged contain no useful information. */
+ int unchanged_modified;
+
+ /* BUF_OVERLAY_MODIFF of current buffer, as of last redisplay that
+ finished; if it matches BUF_OVERLAY_MODIFF, beg_unchanged and
+ end_unchanged contain no useful information. */
+ int overlay_unchanged_modified;
+
+ /* Properties of this buffer's text. */
+ INTERVAL intervals;
+
+ /* 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. */
+ struct Lisp_Marker *markers;
+ };
+
+ /* This is the structure that the buffer Lisp object points to. */
+
+ 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. */
+
+ EMACS_INT size;
+
+ /* 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.
+ Note that vectors and most pseudovectors are all on one chain,
+ but buffers are on a separate chain of their own. */
+ struct buffer *next;
+
+ /* This structure holds the coordinates of the buffer contents
+ in ordinary buffers. In indirect buffers, this is not used. */
+ struct buffer_text own_text;
+
+ /* This points to the `struct buffer_text' that used for this buffer.
+ In an ordinary buffer, this is the own_text field above.
+ In an indirect buffer, this is the own_text field of another buffer. */
+ struct buffer_text *text;
+
+ /* Char position of point in buffer. */
+ EMACS_INT pt;
+ /* Byte position of point in buffer. */
+ EMACS_INT pt_byte;
+ /* Char position of beginning of accessible range. */
+ EMACS_INT begv;
+ /* Byte position of beginning of accessible range. */
+ EMACS_INT begv_byte;
+ /* Char position of end of accessible range. */
+ EMACS_INT zv;
+ /* Byte position of end of accessible range. */
+ EMACS_INT zv_byte;
+
+ /* In an indirect buffer, this points to the base buffer.
+ In an ordinary buffer, it is 0. */
+ struct buffer *base_buffer;
+
+ /* A non-zero value in slot IDX means that per-buffer variable
+ with index IDX has a local value in this buffer. The index IDX
+ for a buffer-local variable is stored in that variable's slot
+ in buffer_local_flags as a Lisp integer. If the index is -1,
+ this means the variable is always local in all buffers. */
+ #define MAX_PER_BUFFER_VARS 50
+ char local_flags[MAX_PER_BUFFER_VARS];
+
+ /* 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;
+ /* The value of text->modiff at the last display error.
+ Redisplay of this buffer is inhibited until it changes again. */
+ int display_error_modiff;
+ /* The time at which we detected a failure to auto-save,
+ Or -1 if we didn't have a failure. */
+ int auto_save_failure_time;
+ /* Position in buffer at which display started
+ the last time this buffer was displayed. */
+ EMACS_INT last_window_start;
+
+ /* Set nonzero whenever the narrowing is changed in this buffer. */
+ int clip_changed;
+
+ /* If the long line scan cache is enabled (i.e. the buffer-local
+ variable cache-long-line-scans is non-nil), newline_cache
+ points to the newline cache, and width_run_cache points to the
+ width run cache.
+
+ The newline cache records which stretches of the buffer are
+ known *not* to contain newlines, so that they can be skipped
+ quickly when we search for newlines.
+
+ The width run cache records which stretches of the buffer are
+ known to contain characters whose widths are all the same. If
+ the width run cache maps a character to a value > 0, that value is
+ the character's width; if it maps a character to zero, we don't
+ know what its width is. This allows compute_motion to process
+ such regions very quickly, using algebra instead of inspecting
+ each character. See also width_table, below. */
+ struct region_cache *newline_cache;
+ struct region_cache *width_run_cache;
+
+ /* Non-zero means don't use redisplay optimizations for
+ displaying this buffer. */
+ unsigned prevent_redisplay_optimizations_p : 1;
+
+ /* List of overlays that end at or before the current center,
+ in order of end-position. */
+ struct Lisp_Overlay *overlays_before;
+
+ /* List of overlays that end after the current center,
+ in order of start-position. */
+ struct Lisp_Overlay *overlays_after;
+
+ /* Position where the overlay lists are centered. */
+ EMACS_INT overlay_center;
+
+ /* Everything from here down must be a Lisp_Object. */
+
+ /* The name of this buffer. */
+ Lisp_Object name;
+
+ /* The name of the file visited in this buffer, or nil. */
+ Lisp_Object filename;
+ /* Dir for expanding relative file names. */
+ Lisp_Object directory;
+ /* True iff this buffer has been backed up (if you write to the
+ visited 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.
+ This is not in the struct buffer_text
+ because it's not used in indirect buffers at all. */
+ Lisp_Object save_length;
+ /* File name used for auto-saving this buffer.
+ This is not in the struct buffer_text
+ because it's not used in indirect buffers at all. */
+ Lisp_Object auto_save_file_name;
+
+ /* Non-nil if buffer read-only. */
+ Lisp_Object read_only;
+ /* "The mark". This is a marker which may
+ point into this buffer or may point nowhere. */
+ 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;
+ /* Mode line element that controls format of mode line. */
+ Lisp_Object mode_line_format;
+
+ /* Changes in the buffer are recorded here for undo.
+ t means don't record anything.
+ This information belongs to the base buffer of an indirect buffer,
+ But we can't store it in the struct buffer_text
+ because local variables have to be right in the struct buffer.
+ So we copy it around in set_buffer_internal.
+ This comes before `name' because it is marked in a special way. */
+ Lisp_Object undo_list;
+
+ /* Analogous to mode_line_format for the line displayed at the top
+ of windows. Nil means don't display that line. */
+ Lisp_Object header_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;
+ /* This buffer's category table. */
+ Lisp_Object category_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;
+ /* nil: text, t: binary.
+ This value is meaningful only on certain operating systems. */
+ /* Actually, we don't need this flag any more because end-of-line
+ is handled correctly according to the buffer-file-coding-system
+ of the buffer. Just keeping it for backward compatibility. */
+ Lisp_Object buffer_file_type;
+
+ /* Case table for case-conversion in this buffer.
+ This char-table maps each char into its lower-case version. */
+ Lisp_Object downcase_table;
+ /* Char-table mapping each char to its upper-case version. */
+ Lisp_Object upcase_table;
+ /* Char-table for conversion for case-folding search. */
+ Lisp_Object case_canon_table;
+ /* Char-table of equivalences for case-folding search. */
+ Lisp_Object case_eqv_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 display text from right to left. */
+ Lisp_Object direction_reversed;
+ /* 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;
+ /* t means the mark and region are currently active. */
+ Lisp_Object mark_active;
+
+ /* Non-nil means the buffer contents are regarded as multi-byte
+ form of characters, not a binary code. */
+ Lisp_Object enable_multibyte_characters;
+
+ /* Coding system to be used for encoding the buffer contents on
+ saving. */
+ Lisp_Object buffer_file_coding_system;
+
+ /* List of symbols naming the file format used for visited file. */
+ Lisp_Object file_format;
+
+ /* True if the newline position cache and width run cache are
+ enabled. See search.c and indent.c. */
+ Lisp_Object cache_long_line_scans;
+
+ /* If the width run cache is enabled, this table contains the
+ character widths width_run_cache (see above) assumes. When we
+ do a thorough redisplay, we compare this against the buffer's
+ current display table to see whether the display table has
+ affected the widths of any characters. If it has, we
+ invalidate the width run cache, and re-initialize width_table. */
+ Lisp_Object width_table;
+
+ /* In an indirect buffer, or a buffer that is the base of an
+ indirect buffer, this holds a marker that records
+ PT for this buffer when the buffer is not current. */
+ Lisp_Object pt_marker;
+
+ /* In an indirect buffer, or a buffer that is the base of an
+ indirect buffer, this holds a marker that records
+ BEGV for this buffer when the buffer is not current. */
+ Lisp_Object begv_marker;
+
+ /* In an indirect buffer, or a buffer that is the base of an
+ indirect buffer, this holds a marker that records
+ ZV for this buffer when the buffer is not current. */
+ Lisp_Object zv_marker;
+
+ /* This holds the point value before the last scroll operation.
+ Explicitly setting point sets this to nil. */
+ Lisp_Object point_before_scroll;
+
+ /* Truename of the visited file, or nil. */
+ Lisp_Object file_truename;
+
+ /* Invisibility spec of this buffer.
+ t => any non-nil `invisible' property means invisible.
+ A list => `invisible' property means invisible
+ if it is memq in that list. */
+ Lisp_Object invisibility_spec;
+
+ /* This is the last window that was selected with this buffer in it,
+ or nil if that window no longer displays this buffer. */
+ Lisp_Object last_selected_window;
+
+ /* Incremented each time the buffer is displayed in a window. */
+ Lisp_Object display_count;
+
+ /* Widths of left and right marginal areas for windows displaying
+ this buffer. */
+ Lisp_Object left_margin_cols, right_margin_cols;
+
+ /* Widths of left and right fringe areas for windows displaying
+ this buffer. */
+ Lisp_Object left_fringe_width, right_fringe_width;
+
+ /* Non-nil means fringes are drawn outside display margins;
+ othersize draw them between margin areas and text. */
+ Lisp_Object fringes_outside_margins;
+
+ /* Width and type of scroll bar areas for windows displaying
+ this buffer. */
+ Lisp_Object scroll_bar_width, vertical_scroll_bar_type;
+
+ /* Non-nil means indicate lines not displaying text (in a style
+ like vi). */
+ Lisp_Object indicate_empty_lines;
+
+ /* Time stamp updated each time this buffer is displayed in a window. */
+ Lisp_Object display_time;
+
+ /* If scrolling the display because point is below the bottom of a
+ window showing this buffer, try to choose a window start so
+ that point ends up this number of lines from the top of the
+ window. Nil means that scrolling method isn't used. */
+ Lisp_Object scroll_up_aggressively;
+
+ /* If scrolling the display because point is above the top of a
+ window showing this buffer, try to choose a window start so
+ that point ends up this number of lines from the bottom of the
+ window. Nil means that scrolling method isn't used. */
+ Lisp_Object scroll_down_aggressively;
+
+ /* Desired cursor type in this buffer. See the doc string of
+ per-buffer variable `cursor-type'. */
+ Lisp_Object cursor_type;
+
+ /* An integer > 0 means put that number of pixels below text lines
+ in the display of this buffer. */
+ Lisp_Object extra_line_spacing;
+ };
+
+
+ /* 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 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 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 (except nil is always allowed).
+ When a tag does not match, the function
+ buffer_slot_type_mismatch will signal an error.
+
+ If a slot here contains -1, the corresponding variable is read-only. */
+
+ extern struct buffer buffer_local_types;
+
+ extern void delete_all_overlays P_ ((struct buffer *));
+ extern void reset_buffer P_ ((struct buffer *));
+ extern void evaporate_overlays P_ ((EMACS_INT));
+ extern int overlays_at P_ ((EMACS_INT, int, Lisp_Object **, int *, int *, int
*, int));
+ extern int sort_overlays P_ ((Lisp_Object *, int, struct window *));
+ extern void recenter_overlay_lists P_ ((struct buffer *, EMACS_INT));
+ extern int overlay_strings P_ ((EMACS_INT, struct window *, unsigned char
**));
+ extern void validate_region P_ ((Lisp_Object *, Lisp_Object *));
+ extern void set_buffer_internal P_ ((struct buffer *));
+ extern void set_buffer_internal_1 P_ ((struct buffer *));
+ extern void set_buffer_temp P_ ((struct buffer *));
+ extern void record_buffer P_ ((Lisp_Object));
+ extern void buffer_slot_type_mismatch P_ ((int));
+ extern void fix_overlays_before P_ ((struct buffer *, EMACS_INT, EMACS_INT));
+ extern void mmap_set_vars P_ ((int));
+
+ EXFUN (Fbuffer_live_p, 1);
+ EXFUN (Fbuffer_name, 1);
+ EXFUN (Fget_file_buffer, 1);
+ EXFUN (Fnext_overlay_change, 1);
+ EXFUN (Fdelete_overlay, 1);
+ EXFUN (Fbuffer_local_value, 2);
+
+ /* Functions to call before and after each text change. */
+ extern Lisp_Object Vbefore_change_functions;
+ extern Lisp_Object Vafter_change_functions;
+ extern Lisp_Object Vfirst_change_hook;
+ extern Lisp_Object Qbefore_change_functions;
+ extern Lisp_Object Qafter_change_functions;
+ extern Lisp_Object Qfirst_change_hook;
+
+ /* If nonzero, all modification hooks are suppressed. */
+ extern int inhibit_modification_hooks;
+
+ extern Lisp_Object Vdeactivate_mark;
+ extern Lisp_Object Vtransient_mark_mode;
+
+ /* Overlays */
+
+ /* 1 if the OV is an overlay object. */
+
+ #define OVERLAY_VALID(OV) (OVERLAYP (OV))
+
+ /* Return the marker that stands for where OV starts in the buffer. */
+
+ #define OVERLAY_START(OV) (XOVERLAY (OV)->start)
+
+ /* Return the marker that stands for where OV ends in the buffer. */
+
+ #define OVERLAY_END(OV) (XOVERLAY (OV)->end)
+
+ /* Return the plist of overlay OV. */
+
+ #define OVERLAY_PLIST(OV) XOVERLAY ((OV))->plist
+
+ /* Return the actual buffer position for the marker P.
+ We assume you know which buffer it's pointing into. */
+
+ #define OVERLAY_POSITION(P) \
+ (GC_MARKERP (P) ? marker_position (P) : (abort (), 0))
+
+
+ /***********************************************************************
+ Buffer-local Variables
+ ***********************************************************************/
+
+ /* Number of per-buffer variables used. */
+
+ extern int last_per_buffer_idx;
+
+ /* Return the offset in bytes of member VAR of struct buffer
+ from the start of a buffer structure. */
+
+ #define PER_BUFFER_VAR_OFFSET(VAR) \
+ ((char *) &buffer_local_flags.VAR - (char *) &buffer_local_flags)
+
+ /* Return the index of buffer-local variable VAR. Each per-buffer
+ variable has an index > 0 associated with it, except when it always
+ has buffer-local values, in which case the index is -1. If this is
+ 0, this is a bug and means that the slot of VAR in
+ buffer_local_flags wasn't intiialized. */
+
+ #define PER_BUFFER_VAR_IDX(VAR) \
+ PER_BUFFER_IDX (PER_BUFFER_VAR_OFFSET (VAR))
+
+ /* Value is non-zero if the variable with index IDX has a local value
+ in buffer B. */
+
+ #define PER_BUFFER_VALUE_P(B, IDX) \
+ (((IDX) < 0 || IDX >= last_per_buffer_idx) \
+ ? (abort (), 0) \
+ : ((B)->local_flags[IDX] != 0))
+
+ /* Set whether per-buffer variable with index IDX has a buffer-local
+ value in buffer B. VAL zero means it hasn't. */
+
+ #define SET_PER_BUFFER_VALUE_P(B, IDX, VAL) \
+ do { \
+ if ((IDX) < 0 || (IDX) >= last_per_buffer_idx) \
+ abort (); \
+ (B)->local_flags[IDX] = (VAL); \
+ } while (0)
+
+ /* Return the index of the per-buffer variable at offset OFFSET in the
+ buffer structure. */
+
+ #define PER_BUFFER_IDX(OFFSET) \
+ XINT (*(Lisp_Object *)((OFFSET) + (char *) &buffer_local_flags))
+
+ /* Return the default value of the per-buffer variable at offset
+ OFFSET in the buffer structure. */
+
+ #define PER_BUFFER_DEFAULT(OFFSET) \
+ (*(Lisp_Object *)((OFFSET) + (char *) &buffer_defaults))
+
+ /* Return the buffer-local value of the per-buffer variable at offset
+ OFFSET in the buffer structure. */
+
+ #define PER_BUFFER_VALUE(BUFFER, OFFSET) \
+ (*(Lisp_Object *)((OFFSET) + (char *) (BUFFER)))
+
+ /* 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))
+
+ /* Return the type of the per-buffer variable at offset OFFSET in the
+ buffer structure. */
+
+ #define PER_BUFFER_TYPE(OFFSET) \
+ (*(Lisp_Object *)((OFFSET) + (char *) &buffer_local_types))
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Kenichi Handa <=