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insdel.c
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insdel.c
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/* Buffer insertion/deletion and gap motion for GNU Emacs.
Copyright (C) 1985-1986, 1993-1995, 1997-2012
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 <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <intprops.h>
#include "lisp.h"
#include "intervals.h"
#include "character.h"
#include "buffer.h"
#include "window.h"
#include "blockinput.h"
#include "region-cache.h"
static void insert_from_string_1 (Lisp_Object, ptrdiff_t, ptrdiff_t, ptrdiff_t,
ptrdiff_t, bool, bool);
static void insert_from_buffer_1 (struct buffer *, ptrdiff_t, ptrdiff_t, bool);
static void gap_left (ptrdiff_t, ptrdiff_t, bool);
static void gap_right (ptrdiff_t, ptrdiff_t);
/* List of elements of the form (BEG-UNCHANGED END-UNCHANGED CHANGE-AMOUNT)
describing changes which happened while combine_after_change_calls
was non-nil. We use this to decide how to call them
once the deferral ends.
In each element.
BEG-UNCHANGED is the number of chars before the changed range.
END-UNCHANGED is the number of chars after the changed range,
and CHANGE-AMOUNT is the number of characters inserted by the change
(negative for a deletion). */
static Lisp_Object combine_after_change_list;
/* Buffer which combine_after_change_list is about. */
static Lisp_Object combine_after_change_buffer;
Lisp_Object Qinhibit_modification_hooks;
static void signal_before_change (ptrdiff_t, ptrdiff_t, ptrdiff_t *);
/* Also used in marker.c to enable expensive marker checks. */
#ifdef MARKER_DEBUG
static void
check_markers (void)
{
struct Lisp_Marker *tail;
bool multibyte = ! NILP (BVAR (current_buffer, enable_multibyte_characters));
for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next)
{
if (tail->buffer->text != current_buffer->text)
emacs_abort ();
if (tail->charpos > Z)
emacs_abort ();
if (tail->bytepos > Z_BYTE)
emacs_abort ();
if (multibyte && ! CHAR_HEAD_P (FETCH_BYTE (tail->bytepos)))
emacs_abort ();
}
}
#else /* not MARKER_DEBUG */
#define check_markers() do { } while (0)
#endif /* MARKER_DEBUG */
/* Move gap to position CHARPOS.
Note that this can quit! */
void
move_gap (ptrdiff_t charpos)
{
move_gap_both (charpos, charpos_to_bytepos (charpos));
}
/* Move gap to byte position BYTEPOS, which is also char position CHARPOS.
Note that this can quit! */
void
move_gap_both (ptrdiff_t charpos, ptrdiff_t bytepos)
{
if (bytepos < GPT_BYTE)
gap_left (charpos, bytepos, 0);
else if (bytepos > GPT_BYTE)
gap_right (charpos, bytepos);
}
/* Move the gap to a position less than the current GPT.
BYTEPOS describes the new position as a byte position,
and CHARPOS is the corresponding char position.
If NEWGAP, then don't update beg_unchanged and end_unchanged. */
static void
gap_left (ptrdiff_t charpos, ptrdiff_t bytepos, bool newgap)
{
unsigned char *to, *from;
ptrdiff_t i;
ptrdiff_t new_s1;
if (!newgap)
BUF_COMPUTE_UNCHANGED (current_buffer, charpos, GPT);
i = GPT_BYTE;
to = GAP_END_ADDR;
from = GPT_ADDR;
new_s1 = GPT_BYTE;
/* Now copy the characters. To move the gap down,
copy characters up. */
while (1)
{
/* I gets number of characters left to copy. */
i = new_s1 - bytepos;
if (i == 0)
break;
/* If a quit is requested, stop copying now.
Change BYTEPOS to be where we have actually moved the gap to. */
if (QUITP)
{
bytepos = new_s1;
charpos = BYTE_TO_CHAR (bytepos);
break;
}
/* Move at most 32000 chars before checking again for a quit. */
if (i > 32000)
i = 32000;
new_s1 -= i;
from -= i, to -= i;
memmove (to, from, i);
}
/* Adjust buffer data structure, to put the gap at BYTEPOS.
BYTEPOS is where the loop above stopped, which may be what
was specified or may be where a quit was detected. */
GPT_BYTE = bytepos;
GPT = charpos;
eassert (charpos <= bytepos);
if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */
QUIT;
}
/* Move the gap to a position greater than the current GPT.
BYTEPOS describes the new position as a byte position,
and CHARPOS is the corresponding char position. */
static void
gap_right (ptrdiff_t charpos, ptrdiff_t bytepos)
{
register unsigned char *to, *from;
register ptrdiff_t i;
ptrdiff_t new_s1;
BUF_COMPUTE_UNCHANGED (current_buffer, charpos, GPT);
i = GPT_BYTE;
from = GAP_END_ADDR;
to = GPT_ADDR;
new_s1 = GPT_BYTE;
/* Now copy the characters. To move the gap up,
copy characters down. */
while (1)
{
/* I gets number of characters left to copy. */
i = bytepos - new_s1;
if (i == 0)
break;
/* If a quit is requested, stop copying now.
Change BYTEPOS to be where we have actually moved the gap to. */
if (QUITP)
{
bytepos = new_s1;
charpos = BYTE_TO_CHAR (bytepos);
break;
}
/* Move at most 32000 chars before checking again for a quit. */
if (i > 32000)
i = 32000;
new_s1 += i;
memmove (to, from, i);
from += i, to += i;
}
GPT = charpos;
GPT_BYTE = bytepos;
eassert (charpos <= bytepos);
if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */
QUIT;
}
/* Adjust all markers for a deletion
whose range in bytes is FROM_BYTE to TO_BYTE.
The range in charpos is FROM to TO.
This function assumes that the gap is adjacent to
or inside of the range being deleted. */
void
adjust_markers_for_delete (ptrdiff_t from, ptrdiff_t from_byte,
ptrdiff_t to, ptrdiff_t to_byte)
{
Lisp_Object marker;
register struct Lisp_Marker *m;
register ptrdiff_t charpos;
for (m = BUF_MARKERS (current_buffer); m; m = m->next)
{
charpos = m->charpos;
eassert (charpos <= Z);
/* If the marker is after the deletion,
relocate by number of chars / bytes deleted. */
if (charpos > to)
{
m->charpos -= to - from;
m->bytepos -= to_byte - from_byte;
}
/* Here's the case where a marker is inside text being deleted. */
else if (charpos > from)
{
if (! m->insertion_type)
{ /* Normal markers will end up at the beginning of the
re-inserted text after undoing a deletion, and must be
adjusted to move them to the correct place. */
XSETMISC (marker, m);
record_marker_adjustment (marker, from - charpos);
}
else if (charpos < to)
{ /* Before-insertion markers will automatically move forward
upon re-inserting the deleted text, so we have to arrange
for them to move backward to the correct position. */
XSETMISC (marker, m);
record_marker_adjustment (marker, to - charpos);
}
m->charpos = from;
m->bytepos = from_byte;
}
/* Here's the case where a before-insertion marker is immediately
before the deleted region. */
else if (charpos == from && m->insertion_type)
{
/* Undoing the change uses normal insertion, which will
incorrectly make MARKER move forward, so we arrange for it
to then move backward to the correct place at the beginning
of the deleted region. */
XSETMISC (marker, m);
record_marker_adjustment (marker, to - from);
}
}
}
/* Adjust markers for an insertion that stretches from FROM / FROM_BYTE
to TO / TO_BYTE. We have to relocate the charpos of every marker
that points after the insertion (but not their bytepos).
When a marker points at the insertion point,
we advance it if either its insertion-type is t
or BEFORE_MARKERS is true. */
static void
adjust_markers_for_insert (ptrdiff_t from, ptrdiff_t from_byte,
ptrdiff_t to, ptrdiff_t to_byte, bool before_markers)
{
struct Lisp_Marker *m;
bool adjusted = 0;
ptrdiff_t nchars = to - from;
ptrdiff_t nbytes = to_byte - from_byte;
for (m = BUF_MARKERS (current_buffer); m; m = m->next)
{
eassert (m->bytepos >= m->charpos
&& m->bytepos - m->charpos <= Z_BYTE - Z);
if (m->bytepos == from_byte)
{
if (m->insertion_type || before_markers)
{
m->bytepos = to_byte;
m->charpos = to;
if (m->insertion_type)
adjusted = 1;
}
}
else if (m->bytepos > from_byte)
{
m->bytepos += nbytes;
m->charpos += nchars;
}
}
/* Adjusting only markers whose insertion-type is t may result in
- disordered start and end in overlays, and
- disordered overlays in the slot `overlays_before' of current_buffer. */
if (adjusted)
{
fix_start_end_in_overlays (from, to);
fix_overlays_before (current_buffer, from, to);
}
}
/* Adjust point for an insertion of NBYTES bytes, which are NCHARS characters.
This is used only when the value of point changes due to an insert
or delete; it does not represent a conceptual change in point as a
marker. In particular, point is not crossing any interval
boundaries, so there's no need to use the usual SET_PT macro. In
fact it would be incorrect to do so, because either the old or the
new value of point is out of sync with the current set of
intervals. */
static void
adjust_point (ptrdiff_t nchars, ptrdiff_t nbytes)
{
SET_BUF_PT_BOTH (current_buffer, PT + nchars, PT_BYTE + nbytes);
/* In a single-byte buffer, the two positions must be equal. */
eassert (PT_BYTE >= PT && PT_BYTE - PT <= ZV_BYTE - ZV);
}
/* Adjust markers for a replacement of a text at FROM (FROM_BYTE) of
length OLD_CHARS (OLD_BYTES) to a new text of length NEW_CHARS
(NEW_BYTES). It is assumed that OLD_CHARS > 0, i.e., this is not
an insertion. */
static void
adjust_markers_for_replace (ptrdiff_t from, ptrdiff_t from_byte,
ptrdiff_t old_chars, ptrdiff_t old_bytes,
ptrdiff_t new_chars, ptrdiff_t new_bytes)
{
register struct Lisp_Marker *m;
ptrdiff_t prev_to_byte = from_byte + old_bytes;
ptrdiff_t diff_chars = new_chars - old_chars;
ptrdiff_t diff_bytes = new_bytes - old_bytes;
for (m = BUF_MARKERS (current_buffer); m; m = m->next)
{
if (m->bytepos >= prev_to_byte)
{
m->charpos += diff_chars;
m->bytepos += diff_bytes;
}
else if (m->bytepos > from_byte)
{
m->charpos = from;
m->bytepos = from_byte;
}
}
check_markers ();
}
void
buffer_overflow (void)
{
error ("Maximum buffer size exceeded");
}
/* Make the gap NBYTES_ADDED bytes longer. */
static void
make_gap_larger (ptrdiff_t nbytes_added)
{
Lisp_Object tem;
ptrdiff_t real_gap_loc;
ptrdiff_t real_gap_loc_byte;
ptrdiff_t old_gap_size;
ptrdiff_t current_size = Z_BYTE - BEG_BYTE + GAP_SIZE;
enum { enough_for_a_while = 2000 };
if (BUF_BYTES_MAX - current_size < nbytes_added)
buffer_overflow ();
/* If we have to get more space, get enough to last a while;
but do not exceed the maximum buffer size. */
nbytes_added = min (nbytes_added + enough_for_a_while,
BUF_BYTES_MAX - current_size);
enlarge_buffer_text (current_buffer, nbytes_added);
/* Prevent quitting in move_gap. */
tem = Vinhibit_quit;
Vinhibit_quit = Qt;
real_gap_loc = GPT;
real_gap_loc_byte = GPT_BYTE;
old_gap_size = GAP_SIZE;
/* Call the newly allocated space a gap at the end of the whole space. */
GPT = Z + GAP_SIZE;
GPT_BYTE = Z_BYTE + GAP_SIZE;
GAP_SIZE = nbytes_added;
/* Move the new gap down to be consecutive with the end of the old one.
This adjusts the markers properly too. */
gap_left (real_gap_loc + old_gap_size, real_gap_loc_byte + old_gap_size, 1);
/* Now combine the two into one large gap. */
GAP_SIZE += old_gap_size;
GPT = real_gap_loc;
GPT_BYTE = real_gap_loc_byte;
/* Put an anchor. */
*(Z_ADDR) = 0;
Vinhibit_quit = tem;
}
#if defined USE_MMAP_FOR_BUFFERS || defined REL_ALLOC || defined DOUG_LEA_MALLOC
/* Make the gap NBYTES_REMOVED bytes shorter. */
static void
make_gap_smaller (ptrdiff_t nbytes_removed)
{
Lisp_Object tem;
ptrdiff_t real_gap_loc;
ptrdiff_t real_gap_loc_byte;
ptrdiff_t real_Z;
ptrdiff_t real_Z_byte;
ptrdiff_t real_beg_unchanged;
ptrdiff_t new_gap_size;
/* Make sure the gap is at least 20 bytes. */
if (GAP_SIZE - nbytes_removed < 20)
nbytes_removed = GAP_SIZE - 20;
/* Prevent quitting in move_gap. */
tem = Vinhibit_quit;
Vinhibit_quit = Qt;
real_gap_loc = GPT;
real_gap_loc_byte = GPT_BYTE;
new_gap_size = GAP_SIZE - nbytes_removed;
real_Z = Z;
real_Z_byte = Z_BYTE;
real_beg_unchanged = BEG_UNCHANGED;
/* Pretend that the last unwanted part of the gap is the entire gap,
and that the first desired part of the gap is part of the buffer
text. */
memset (GPT_ADDR, 0, new_gap_size);
GPT += new_gap_size;
GPT_BYTE += new_gap_size;
Z += new_gap_size;
Z_BYTE += new_gap_size;
GAP_SIZE = nbytes_removed;
/* Move the unwanted pretend gap to the end of the buffer. This
adjusts the markers properly too. */
gap_right (Z, Z_BYTE);
enlarge_buffer_text (current_buffer, -nbytes_removed);
/* Now restore the desired gap. */
GAP_SIZE = new_gap_size;
GPT = real_gap_loc;
GPT_BYTE = real_gap_loc_byte;
Z = real_Z;
Z_BYTE = real_Z_byte;
BEG_UNCHANGED = real_beg_unchanged;
/* Put an anchor. */
*(Z_ADDR) = 0;
Vinhibit_quit = tem;
}
#endif /* USE_MMAP_FOR_BUFFERS || REL_ALLOC || DOUG_LEA_MALLOC */
void
make_gap (ptrdiff_t nbytes_added)
{
if (nbytes_added >= 0)
make_gap_larger (nbytes_added);
#if defined USE_MMAP_FOR_BUFFERS || defined REL_ALLOC || defined DOUG_LEA_MALLOC
else
make_gap_smaller (-nbytes_added);
#endif
}
/* Copy NBYTES bytes of text from FROM_ADDR to TO_ADDR.
FROM_MULTIBYTE says whether the incoming text is multibyte.
TO_MULTIBYTE says whether to store the text as multibyte.
If FROM_MULTIBYTE != TO_MULTIBYTE, we convert.
Return the number of bytes stored at TO_ADDR. */
ptrdiff_t
copy_text (const unsigned char *from_addr, unsigned char *to_addr,
ptrdiff_t nbytes, bool from_multibyte, bool to_multibyte)
{
if (from_multibyte == to_multibyte)
{
memcpy (to_addr, from_addr, nbytes);
return nbytes;
}
else if (from_multibyte)
{
ptrdiff_t nchars = 0;
ptrdiff_t bytes_left = nbytes;
while (bytes_left > 0)
{
int thislen, c;
c = STRING_CHAR_AND_LENGTH (from_addr, thislen);
if (! ASCII_CHAR_P (c))
c &= 0xFF;
*to_addr++ = c;
from_addr += thislen;
bytes_left -= thislen;
nchars++;
}
return nchars;
}
else
{
unsigned char *initial_to_addr = to_addr;
/* Convert single-byte to multibyte. */
while (nbytes > 0)
{
int c = *from_addr++;
if (!ASCII_CHAR_P (c))
{
c = BYTE8_TO_CHAR (c);
to_addr += CHAR_STRING (c, to_addr);
nbytes--;
}
else
/* Special case for speed. */
*to_addr++ = c, nbytes--;
}
return to_addr - initial_to_addr;
}
}
/* Insert a string of specified length before point.
This function judges multibyteness based on
enable_multibyte_characters in the current buffer;
it never converts between single-byte and multibyte.
DO NOT use this for the contents of a Lisp string or a Lisp buffer!
prepare_to_modify_buffer could relocate the text. */
void
insert (const char *string, ptrdiff_t nbytes)
{
if (nbytes > 0)
{
ptrdiff_t len = chars_in_text ((unsigned char *) string, nbytes), opoint;
insert_1_both (string, len, nbytes, 0, 1, 0);
opoint = PT - len;
signal_after_change (opoint, 0, len);
update_compositions (opoint, PT, CHECK_BORDER);
}
}
/* Likewise, but inherit text properties from neighboring characters. */
void
insert_and_inherit (const char *string, ptrdiff_t nbytes)
{
if (nbytes > 0)
{
ptrdiff_t len = chars_in_text ((unsigned char *) string, nbytes), opoint;
insert_1_both (string, len, nbytes, 1, 1, 0);
opoint = PT - len;
signal_after_change (opoint, 0, len);
update_compositions (opoint, PT, CHECK_BORDER);
}
}
/* Insert the character C before point. Do not inherit text properties. */
void
insert_char (int c)
{
unsigned char str[MAX_MULTIBYTE_LENGTH];
int len;
if (! NILP (BVAR (current_buffer, enable_multibyte_characters)))
len = CHAR_STRING (c, str);
else
{
len = 1;
str[0] = c;
}
insert ((char *) str, len);
}
/* Insert the null-terminated string S before point. */
void
insert_string (const char *s)
{
insert (s, strlen (s));
}
/* Like `insert' except that all markers pointing at the place where
the insertion happens are adjusted to point after it.
Don't use this function to insert part of a Lisp string,
since gc could happen and relocate it. */
void
insert_before_markers (const char *string, ptrdiff_t nbytes)
{
if (nbytes > 0)
{
ptrdiff_t len = chars_in_text ((unsigned char *) string, nbytes), opoint;
insert_1_both (string, len, nbytes, 0, 1, 1);
opoint = PT - len;
signal_after_change (opoint, 0, len);
update_compositions (opoint, PT, CHECK_BORDER);
}
}
/* Likewise, but inherit text properties from neighboring characters. */
void
insert_before_markers_and_inherit (const char *string,
ptrdiff_t nbytes)
{
if (nbytes > 0)
{
ptrdiff_t len = chars_in_text ((unsigned char *) string, nbytes), opoint;
insert_1_both (string, len, nbytes, 1, 1, 1);
opoint = PT - len;
signal_after_change (opoint, 0, len);
update_compositions (opoint, PT, CHECK_BORDER);
}
}
/* Subroutine used by the insert functions above. */
void
insert_1 (const char *string, ptrdiff_t nbytes,
bool inherit, bool prepare, bool before_markers)
{
insert_1_both (string, chars_in_text ((unsigned char *) string, nbytes),
nbytes, inherit, prepare, before_markers);
}
#ifdef BYTE_COMBINING_DEBUG
/* See if the bytes before POS/POS_BYTE combine with bytes
at the start of STRING to form a single character.
If so, return the number of bytes at the start of STRING
which combine in this way. Otherwise, return 0. */
int
count_combining_before (const unsigned char *string, ptrdiff_t length,
ptrdiff_t pos, ptrdiff_t pos_byte)
{
int len, combining_bytes;
const unsigned char *p;
if (NILP (current_buffer->enable_multibyte_characters))
return 0;
/* At first, we can exclude the following cases:
(1) STRING[0] can't be a following byte of multibyte sequence.
(2) POS is the start of the current buffer.
(3) A character before POS is not a multibyte character. */
if (length == 0 || CHAR_HEAD_P (*string)) /* case (1) */
return 0;
if (pos_byte == BEG_BYTE) /* case (2) */
return 0;
len = 1;
p = BYTE_POS_ADDR (pos_byte - 1);
while (! CHAR_HEAD_P (*p)) p--, len++;
if (! LEADING_CODE_P (*p)) /* case (3) */
return 0;
combining_bytes = BYTES_BY_CHAR_HEAD (*p) - len;
if (combining_bytes <= 0)
/* The character preceding POS is, complete and no room for
combining bytes (combining_bytes == 0), or an independent 8-bit
character (combining_bytes < 0). */
return 0;
/* We have a combination situation. Count the bytes at STRING that
may combine. */
p = string + 1;
while (!CHAR_HEAD_P (*p) && p < string + length)
p++;
return (combining_bytes < p - string ? combining_bytes : p - string);
}
/* See if the bytes after POS/POS_BYTE combine with bytes
at the end of STRING to form a single character.
If so, return the number of bytes after POS/POS_BYTE
which combine in this way. Otherwise, return 0. */
int
count_combining_after (const unsigned char *string,
ptrdiff_t length, ptrdiff_t pos, ptrdiff_t pos_byte)
{
ptrdiff_t opos_byte = pos_byte;
ptrdiff_t i;
ptrdiff_t bytes;
unsigned char *bufp;
if (NILP (current_buffer->enable_multibyte_characters))
return 0;
/* At first, we can exclude the following cases:
(1) The last byte of STRING is an ASCII.
(2) POS is the last of the current buffer.
(3) A character at POS can't be a following byte of multibyte
character. */
if (length > 0 && ASCII_BYTE_P (string[length - 1])) /* case (1) */
return 0;
if (pos_byte == Z_BYTE) /* case (2) */
return 0;
bufp = BYTE_POS_ADDR (pos_byte);
if (CHAR_HEAD_P (*bufp)) /* case (3) */
return 0;
i = length - 1;
while (i >= 0 && ! CHAR_HEAD_P (string[i]))
{
i--;
}
if (i < 0)
{
/* All characters in STRING are not character head. We must
check also preceding bytes at POS. We are sure that the gap
is at POS. */
unsigned char *p = BEG_ADDR;
i = pos_byte - 2;
while (i >= 0 && ! CHAR_HEAD_P (p[i]))
i--;
if (i < 0 || !LEADING_CODE_P (p[i]))
return 0;
bytes = BYTES_BY_CHAR_HEAD (p[i]);
return (bytes <= pos_byte - 1 - i + length
? 0
: bytes - (pos_byte - 1 - i + length));
}
if (!LEADING_CODE_P (string[i]))
return 0;
bytes = BYTES_BY_CHAR_HEAD (string[i]) - (length - i);
bufp++, pos_byte++;
while (!CHAR_HEAD_P (*bufp)) bufp++, pos_byte++;
return (bytes <= pos_byte - opos_byte ? bytes : pos_byte - opos_byte);
}
#endif
/* Insert a sequence of NCHARS chars which occupy NBYTES bytes
starting at STRING. INHERIT, PREPARE and BEFORE_MARKERS
are the same as in insert_1. */
void
insert_1_both (const char *string,
ptrdiff_t nchars, ptrdiff_t nbytes,
bool inherit, bool prepare, bool before_markers)
{
if (nchars == 0)
return;
if (NILP (BVAR (current_buffer, enable_multibyte_characters)))
nchars = nbytes;
if (prepare)
/* Do this before moving and increasing the gap,
because the before-change hooks might move the gap
or make it smaller. */
prepare_to_modify_buffer (PT, PT, NULL);
if (PT != GPT)
move_gap_both (PT, PT_BYTE);
if (GAP_SIZE < nbytes)
make_gap (nbytes - GAP_SIZE);
#ifdef BYTE_COMBINING_DEBUG
if (count_combining_before (string, nbytes, PT, PT_BYTE)
|| count_combining_after (string, nbytes, PT, PT_BYTE))
emacs_abort ();
#endif
/* Record deletion of the surrounding text that combines with
the insertion. This, together with recording the insertion,
will add up to the right stuff in the undo list. */
record_insert (PT, nchars);
MODIFF++;
CHARS_MODIFF = MODIFF;
memcpy (GPT_ADDR, string, nbytes);
GAP_SIZE -= nbytes;
GPT += nchars;
ZV += nchars;
Z += nchars;
GPT_BYTE += nbytes;
ZV_BYTE += nbytes;
Z_BYTE += nbytes;
if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */
eassert (GPT <= GPT_BYTE);
/* The insert may have been in the unchanged region, so check again. */
if (Z - GPT < END_UNCHANGED)
END_UNCHANGED = Z - GPT;
adjust_overlays_for_insert (PT, nchars);
adjust_markers_for_insert (PT, PT_BYTE,
PT + nchars, PT_BYTE + nbytes,
before_markers);
offset_intervals (current_buffer, PT, nchars);
if (!inherit && buffer_intervals (current_buffer))
set_text_properties (make_number (PT), make_number (PT + nchars),
Qnil, Qnil, Qnil);
adjust_point (nchars, nbytes);
check_markers ();
}
/* Insert the part of the text of STRING, a Lisp object assumed to be
of type string, consisting of the LENGTH characters (LENGTH_BYTE bytes)
starting at position POS / POS_BYTE. If the text of STRING has properties,
copy them into the buffer.
It does not work to use `insert' for this, because a GC could happen
before we copy the stuff into the buffer, and relocate the string
without insert noticing. */
void
insert_from_string (Lisp_Object string, ptrdiff_t pos, ptrdiff_t pos_byte,
ptrdiff_t length, ptrdiff_t length_byte, bool inherit)
{
ptrdiff_t opoint = PT;
if (SCHARS (string) == 0)
return;
insert_from_string_1 (string, pos, pos_byte, length, length_byte,
inherit, 0);
signal_after_change (opoint, 0, PT - opoint);
update_compositions (opoint, PT, CHECK_BORDER);
}
/* Like `insert_from_string' except that all markers pointing
at the place where the insertion happens are adjusted to point after it. */
void
insert_from_string_before_markers (Lisp_Object string,
ptrdiff_t pos, ptrdiff_t pos_byte,
ptrdiff_t length, ptrdiff_t length_byte,
bool inherit)
{
ptrdiff_t opoint = PT;
if (SCHARS (string) == 0)
return;
insert_from_string_1 (string, pos, pos_byte, length, length_byte,
inherit, 1);
signal_after_change (opoint, 0, PT - opoint);
update_compositions (opoint, PT, CHECK_BORDER);
}
/* Subroutine of the insertion functions above. */
static void
insert_from_string_1 (Lisp_Object string, ptrdiff_t pos, ptrdiff_t pos_byte,
ptrdiff_t nchars, ptrdiff_t nbytes,
bool inherit, bool before_markers)
{
struct gcpro gcpro1;
ptrdiff_t outgoing_nbytes = nbytes;
INTERVAL intervals;
/* Make OUTGOING_NBYTES describe the text
as it will be inserted in this buffer. */
if (NILP (BVAR (current_buffer, enable_multibyte_characters)))
outgoing_nbytes = nchars;
else if (! STRING_MULTIBYTE (string))
outgoing_nbytes
= count_size_as_multibyte (SDATA (string) + pos_byte,
nbytes);
GCPRO1 (string);
/* Do this before moving and increasing the gap,
because the before-change hooks might move the gap
or make it smaller. */
prepare_to_modify_buffer (PT, PT, NULL);
if (PT != GPT)
move_gap_both (PT, PT_BYTE);
if (GAP_SIZE < outgoing_nbytes)
make_gap (outgoing_nbytes - GAP_SIZE);
UNGCPRO;
/* Copy the string text into the buffer, perhaps converting
between single-byte and multibyte. */
copy_text (SDATA (string) + pos_byte, GPT_ADDR, nbytes,
STRING_MULTIBYTE (string),
! NILP (BVAR (current_buffer, enable_multibyte_characters)));
#ifdef BYTE_COMBINING_DEBUG
/* We have copied text into the gap, but we have not altered
PT or PT_BYTE yet. So we can pass PT and PT_BYTE
to these functions and get the same results as we would
have got earlier on. Meanwhile, PT_ADDR does point to
the text that has been stored by copy_text. */
if (count_combining_before (GPT_ADDR, outgoing_nbytes, PT, PT_BYTE)
|| count_combining_after (GPT_ADDR, outgoing_nbytes, PT, PT_BYTE))
emacs_abort ();
#endif
record_insert (PT, nchars);
MODIFF++;
CHARS_MODIFF = MODIFF;
GAP_SIZE -= outgoing_nbytes;
GPT += nchars;
ZV += nchars;
Z += nchars;
GPT_BYTE += outgoing_nbytes;
ZV_BYTE += outgoing_nbytes;
Z_BYTE += outgoing_nbytes;
if (GAP_SIZE > 0) *(GPT_ADDR) = 0; /* Put an anchor. */
eassert (GPT <= GPT_BYTE);
/* The insert may have been in the unchanged region, so check again. */
if (Z - GPT < END_UNCHANGED)
END_UNCHANGED = Z - GPT;
adjust_overlays_for_insert (PT, nchars);
adjust_markers_for_insert (PT, PT_BYTE, PT + nchars,
PT_BYTE + outgoing_nbytes,
before_markers);
offset_intervals (current_buffer, PT, nchars);
intervals = string_intervals (string);
/* Get the intervals for the part of the string we are inserting. */
if (nbytes < SBYTES (string))
intervals = copy_intervals (intervals, pos, nchars);
/* Insert those intervals. */
graft_intervals_into_buffer (intervals, PT, nchars,
current_buffer, inherit);
adjust_point (nchars, outgoing_nbytes);
check_markers ();
}
/* Insert a sequence of NCHARS chars which occupy NBYTES bytes
starting at GPT_ADDR. */
void
insert_from_gap (ptrdiff_t nchars, ptrdiff_t nbytes)
{
if (NILP (BVAR (current_buffer, enable_multibyte_characters)))
nchars = nbytes;
record_insert (GPT, nchars);
MODIFF++;
GAP_SIZE -= nbytes;
GPT += nchars;