/* Markers: examining, setting and deleting.
- Copyright (C) 1985, 1997 Free Software Foundation, Inc.
+ Copyright (C) 1985, 1997, 1998, 2002, 2003, 2004,
+ 2005, 2006 Free Software Foundation, Inc.
This file is part of GNU Emacs.
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. */
+the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA. */
#include <config.h>
static int cached_bytepos;
static struct buffer *cached_buffer;
static int cached_modiff;
+
+static void byte_char_debug_check P_ ((struct buffer *, int, int));
+
+/* Nonzero means enable debugging checks on byte/char correspondences. */
+
+static int byte_debug_flag;
+
+void
+clear_charpos_cache (b)
+ struct buffer *b;
+{
+ if (cached_buffer == b)
+ cached_buffer = 0;
+}
\f
/* Converting between character positions and byte positions. */
/* There are several places in the buffer where we know
- the corrspondence: BEG, BEGV, PT, GPT, ZV and Z,
+ the correspondence: BEG, BEGV, PT, GPT, ZV and Z,
and everywhere there is a marker. So we find the one of these places
that is closest to the specified position, and scan from there. */
int changed = 0; \
\
if (this_charpos == charpos) \
- return (BYTEPOS); \
+ { \
+ int value = (BYTEPOS); \
+ if (byte_debug_flag) \
+ byte_char_debug_check (b, charpos, value); \
+ return value; \
+ } \
else if (this_charpos > charpos) \
{ \
if (this_charpos < best_above) \
if (changed) \
{ \
if (best_above - best_below == best_above_byte - best_below_byte) \
- return best_below_byte + (charpos - best_below); \
+ { \
+ int value = best_below_byte + (charpos - best_below); \
+ if (byte_debug_flag) \
+ byte_char_debug_check (b, charpos, value); \
+ return value; \
+ } \
} \
}
+static void
+byte_char_debug_check (b, charpos, bytepos)
+ struct buffer *b;
+ int charpos, bytepos;
+{
+ int nchars = 0;
+
+ if (bytepos > BUF_GPT_BYTE (b))
+ {
+ nchars = multibyte_chars_in_text (BUF_BEG_ADDR (b),
+ BUF_GPT_BYTE (b) - BUF_BEG_BYTE (b));
+ nchars += multibyte_chars_in_text (BUF_GAP_END_ADDR (b),
+ bytepos - BUF_GPT_BYTE (b));
+ }
+ else
+ nchars = multibyte_chars_in_text (BUF_BEG_ADDR (b),
+ bytepos - BUF_BEG_BYTE (b));
+
+ if (charpos - 1 != nchars)
+ abort ();
+}
+
int
charpos_to_bytepos (charpos)
int charpos;
struct buffer *b;
int charpos;
{
- Lisp_Object tail;
- int gapend_byte = BUF_GPT_BYTE (b) + BUF_GAP_SIZE (b);
+ struct Lisp_Marker *tail;
int best_above, best_above_byte;
int best_below, best_below_byte;
if (best_above == best_above_byte)
return charpos;
- best_below = 1;
- best_below_byte = 1;
+ best_below = BEG;
+ best_below_byte = BEG_BYTE;
/* We find in best_above and best_above_byte
the closest known point above CHARPOS,
if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff)
CONSIDER (cached_charpos, cached_bytepos);
- tail = BUF_MARKERS (b);
- while (XSYMBOL (tail) != XSYMBOL (Qnil))
+ for (tail = BUF_MARKERS (b); tail; tail = tail->next)
{
- int i = XMARKER (tail)->bufpos;
- CONSIDER (XMARKER (tail)->charpos,
- (i > gapend_byte ? i - BUF_GAP_SIZE (b)
- : i > BUF_GPT_BYTE (b) ? BUF_GPT_BYTE (b)
- : i));
+ CONSIDER (tail->charpos, tail->bytepos);
/* If we are down to a range of 50 chars,
don't bother checking any other markers;
scan the intervening chars directly now. */
if (best_above - best_below < 50)
break;
-
- tail = XMARKER (tail)->chain;
}
/* We get here if we did not exactly hit one of the known places.
It will last until the next GC. */
if (record)
{
- Lisp_Object marker;
+ Lisp_Object marker, buffer;
marker = Fmake_marker ();
- set_marker_both (marker, Qnil, best_below, best_below_byte);
+ XSETBUFFER (buffer, b);
+ set_marker_both (marker, buffer, best_below, best_below_byte);
}
+ if (byte_debug_flag)
+ byte_char_debug_check (b, charpos, best_below_byte);
+
cached_buffer = b;
cached_modiff = BUF_MODIFF (b);
cached_charpos = best_below;
It will last until the next GC. */
if (record)
{
- Lisp_Object marker;
+ Lisp_Object marker, buffer;
marker = Fmake_marker ();
- set_marker_both (marker, Qnil, best_above, best_above_byte);
+ XSETBUFFER (buffer, b);
+ set_marker_both (marker, buffer, best_above, best_above_byte);
}
+ if (byte_debug_flag)
+ byte_char_debug_check (b, charpos, best_above_byte);
+
cached_buffer = b;
cached_modiff = BUF_MODIFF (b);
cached_charpos = best_above;
}
#undef CONSIDER
+
+/* Used for debugging: recompute the bytepos corresponding to CHARPOS
+ in the simplest, most reliable way. */
+
+int
+verify_bytepos (charpos)
+ int charpos;
+{
+ int below = 1;
+ int below_byte = 1;
+
+ while (below != charpos)
+ {
+ below++;
+ BUF_INC_POS (current_buffer, below_byte);
+ }
+
+ return below_byte;
+}
\f
/* bytepos_to_charpos returns the char position corresponding to BYTEPOS. */
int changed = 0; \
\
if (this_bytepos == bytepos) \
- return (CHARPOS); \
+ { \
+ int value = (CHARPOS); \
+ if (byte_debug_flag) \
+ byte_char_debug_check (b, value, bytepos); \
+ return value; \
+ } \
else if (this_bytepos > bytepos) \
{ \
if (this_bytepos < best_above_byte) \
if (changed) \
{ \
if (best_above - best_below == best_above_byte - best_below_byte) \
- return best_below + (bytepos - best_below_byte); \
+ { \
+ int value = best_below + (bytepos - best_below_byte); \
+ if (byte_debug_flag) \
+ byte_char_debug_check (b, value, bytepos); \
+ return value; \
+ } \
} \
}
struct buffer *b;
int bytepos;
{
- Lisp_Object tail;
+ struct Lisp_Marker *tail;
int best_above, best_above_byte;
int best_below, best_below_byte;
if (best_above == best_above_byte)
return bytepos;
- best_below = 1;
- best_below_byte = 1;
+ best_below = BEG;
+ best_below_byte = BEG_BYTE;
CONSIDER (BUF_PT_BYTE (b), BUF_PT (b));
CONSIDER (BUF_GPT_BYTE (b), BUF_GPT (b));
if (b == cached_buffer && BUF_MODIFF (b) == cached_modiff)
CONSIDER (cached_bytepos, cached_charpos);
- tail = BUF_MARKERS (b);
- while (XSYMBOL (tail) != XSYMBOL (Qnil))
+ for (tail = BUF_MARKERS (b); tail; tail = tail->next)
{
- int marker_bytepos = XMARKER (tail)->bufpos;
-
- if (marker_bytepos > BUF_GPT_BYTE (b) + BUF_GAP_SIZE (b))
- marker_bytepos -= BUF_GAP_SIZE (b);
- else if (marker_bytepos > BUF_GPT_BYTE (b))
- marker_bytepos = BUF_GPT_BYTE (b);
-
- CONSIDER (marker_bytepos, XMARKER (tail)->charpos);
+ CONSIDER (tail->bytepos, tail->charpos);
/* If we are down to a range of 50 chars,
don't bother checking any other markers;
scan the intervening chars directly now. */
if (best_above - best_below < 50)
break;
-
- tail = XMARKER (tail)->chain;
}
/* We get here if we did not exactly hit one of the known places.
if (bytepos - best_below_byte < best_above_byte - bytepos)
{
- int record = best_above_byte - bytepos > 5000;
+ int record = bytepos - best_below_byte > 5000;
while (best_below_byte < bytepos)
{
/* If this position is quite far from the nearest known position,
cache the correspondence by creating a marker here.
- It will last until the next GC. */
- if (record)
+ It will last until the next GC.
+ But don't do it if BUF_MARKERS is nil;
+ that is a signal from Fset_buffer_multibyte. */
+ if (record && BUF_MARKERS (b))
{
- Lisp_Object marker;
+ Lisp_Object marker, buffer;
marker = Fmake_marker ();
- set_marker_both (marker, Qnil, best_below, best_below_byte);
+ XSETBUFFER (buffer, b);
+ set_marker_both (marker, buffer, best_below, best_below_byte);
}
+ if (byte_debug_flag)
+ byte_char_debug_check (b, best_below, bytepos);
+
cached_buffer = b;
cached_modiff = BUF_MODIFF (b);
cached_charpos = best_below;
/* If this position is quite far from the nearest known position,
cache the correspondence by creating a marker here.
- It will last until the next GC. */
- if (record)
+ It will last until the next GC.
+ But don't do it if BUF_MARKERS is nil;
+ that is a signal from Fset_buffer_multibyte. */
+ if (record && BUF_MARKERS (b))
{
- Lisp_Object marker;
+ Lisp_Object marker, buffer;
marker = Fmake_marker ();
- set_marker_both (marker, Qnil, best_above, best_above_byte);
+ XSETBUFFER (buffer, b);
+ set_marker_both (marker, buffer, best_above, best_above_byte);
}
+ if (byte_debug_flag)
+ byte_char_debug_check (b, best_above, bytepos);
+
cached_buffer = b;
cached_modiff = BUF_MODIFF (b);
cached_charpos = best_above;
/* Operations on markers. */
DEFUN ("marker-buffer", Fmarker_buffer, Smarker_buffer, 1, 1, 0,
- "Return the buffer that MARKER points into, or nil if none.\n\
-Returns nil if MARKER points into a dead buffer.")
- (marker)
+ doc: /* Return the buffer that MARKER points into, or nil if none.
+Returns nil if MARKER points into a dead buffer. */)
+ (marker)
register Lisp_Object marker;
{
register Lisp_Object buf;
- CHECK_MARKER (marker, 0);
+ CHECK_MARKER (marker);
if (XMARKER (marker)->buffer)
{
XSETBUFFER (buf, XMARKER (marker)->buffer);
}
DEFUN ("marker-position", Fmarker_position, Smarker_position, 1, 1, 0,
- "Return the position MARKER points at, as a character number.")
- (marker)
+ doc: /* Return the position MARKER points at, as a character number. */)
+ (marker)
Lisp_Object marker;
{
- register Lisp_Object pos;
- register int i;
- register struct buffer *buf;
-
- CHECK_MARKER (marker, 0);
+ CHECK_MARKER (marker);
if (XMARKER (marker)->buffer)
return make_number (XMARKER (marker)->charpos);
}
\f
DEFUN ("set-marker", Fset_marker, Sset_marker, 2, 3, 0,
- "Position MARKER before character number POSITION in BUFFER.\n\
-BUFFER defaults to the current buffer.\n\
-If POSITION is nil, makes marker point nowhere.\n\
-Then it no longer slows down editing in any buffer.\n\
-Returns MARKER.")
- (marker, position, buffer)
+ doc: /* Position MARKER before character number POSITION in BUFFER.
+BUFFER defaults to the current buffer.
+If POSITION is nil, makes marker point nowhere.
+Then it no longer slows down editing in any buffer.
+Returns MARKER. */)
+ (marker, position, buffer)
Lisp_Object marker, position, buffer;
{
register int charno, bytepos;
register struct buffer *b;
register struct Lisp_Marker *m;
- CHECK_MARKER (marker, 0);
+ CHECK_MARKER (marker);
+ m = XMARKER (marker);
+
/* If position is nil or a marker that points nowhere,
make this marker point nowhere. */
if (NILP (position)
|| (MARKERP (position) && !XMARKER (position)->buffer))
{
- unchain_marker (marker);
+ unchain_marker (m);
return marker;
}
b = current_buffer;
else
{
- CHECK_BUFFER (buffer, 1);
+ CHECK_BUFFER (buffer);
b = XBUFFER (buffer);
/* If buffer is dead, set marker to point nowhere. */
if (EQ (b->name, Qnil))
{
- unchain_marker (marker);
+ unchain_marker (m);
return marker;
}
}
- m = XMARKER (marker);
-
/* Optimize the special case where we are copying the position
of an existing marker, and MARKER is already in the same buffer. */
if (MARKERP (position) && b == XMARKER (position)->buffer
&& b == m->buffer)
{
- m->bufpos = XMARKER (position)->bufpos;
+ m->bytepos = XMARKER (position)->bytepos;
m->charpos = XMARKER (position)->charpos;
return marker;
}
- CHECK_NUMBER_COERCE_MARKER (position, 1);
+ CHECK_NUMBER_COERCE_MARKER (position);
charno = XINT (position);
if (charno > bytepos)
abort ();
- if (bytepos > BUF_GPT_BYTE (b))
- bytepos += BUF_GAP_SIZE (b);
-
- m->bufpos = bytepos;
+ m->bytepos = bytepos;
m->charpos = charno;
if (m->buffer != b)
{
- unchain_marker (marker);
+ unchain_marker (m);
m->buffer = b;
- m->chain = BUF_MARKERS (b);
- BUF_MARKERS (b) = marker;
+ m->next = BUF_MARKERS (b);
+ BUF_MARKERS (b) = m;
}
-
+
return marker;
}
/* This version of Fset_marker won't let the position
be outside the visible part. */
-Lisp_Object
+Lisp_Object
set_marker_restricted (marker, pos, buffer)
Lisp_Object marker, pos, buffer;
{
register struct buffer *b;
register struct Lisp_Marker *m;
- CHECK_MARKER (marker, 0);
+ CHECK_MARKER (marker);
+ m = XMARKER (marker);
+
/* If position is nil or a marker that points nowhere,
make this marker point nowhere. */
if (NILP (pos)
|| (MARKERP (pos) && !XMARKER (pos)->buffer))
{
- unchain_marker (marker);
+ unchain_marker (m);
return marker;
}
b = current_buffer;
else
{
- CHECK_BUFFER (buffer, 1);
+ CHECK_BUFFER (buffer);
b = XBUFFER (buffer);
/* If buffer is dead, set marker to point nowhere. */
if (EQ (b->name, Qnil))
{
- unchain_marker (marker);
+ unchain_marker (m);
return marker;
}
}
- m = XMARKER (marker);
-
/* Optimize the special case where we are copying the position
of an existing marker, and MARKER is already in the same buffer. */
if (MARKERP (pos) && b == XMARKER (pos)->buffer
&& b == m->buffer)
{
- m->bufpos = XMARKER (pos)->bufpos;
+ m->bytepos = XMARKER (pos)->bytepos;
m->charpos = XMARKER (pos)->charpos;
return marker;
}
- CHECK_NUMBER_COERCE_MARKER (pos, 1);
+ CHECK_NUMBER_COERCE_MARKER (pos);
charno = XINT (pos);
if (charno > bytepos)
abort ();
- if (bytepos > BUF_GPT_BYTE (b))
- bytepos += BUF_GAP_SIZE (b);
-
- m->bufpos = bytepos;
+ m->bytepos = bytepos;
m->charpos = charno;
if (m->buffer != b)
{
- unchain_marker (marker);
+ unchain_marker (m);
m->buffer = b;
- m->chain = BUF_MARKERS (b);
- BUF_MARKERS (b) = marker;
+ m->next = BUF_MARKERS (b);
+ BUF_MARKERS (b) = m;
}
-
+
return marker;
}
\f
/* Set the position of MARKER, specifying both the
character position and the corresponding byte position. */
-Lisp_Object
+Lisp_Object
set_marker_both (marker, buffer, charpos, bytepos)
Lisp_Object marker, buffer;
int charpos, bytepos;
register struct buffer *b;
register struct Lisp_Marker *m;
- CHECK_MARKER (marker, 0);
- /* If position is nil or a marker that points nowhere,
- make this marker point nowhere. */
- if (NILP (charpos)
- || (MARKERP (charpos) && !XMARKER (charpos)->buffer))
- {
- unchain_marker (marker);
- return marker;
- }
+ CHECK_MARKER (marker);
+ m = XMARKER (marker);
- CHECK_NUMBER_COERCE_MARKER (charpos, 1);
if (NILP (buffer))
b = current_buffer;
else
{
- CHECK_BUFFER (buffer, 1);
+ CHECK_BUFFER (buffer);
b = XBUFFER (buffer);
/* If buffer is dead, set marker to point nowhere. */
if (EQ (b->name, Qnil))
{
- unchain_marker (marker);
+ unchain_marker (m);
return marker;
}
}
- m = XMARKER (marker);
-
/* In a single-byte buffer, the two positions must be equal. */
if (BUF_Z (b) == BUF_Z_BYTE (b)
&& charpos != bytepos)
if (charpos > bytepos)
abort ();
- if (bytepos > BUF_GPT_BYTE (b))
- bytepos += BUF_GAP_SIZE (b);
-
- m->bufpos = bytepos;
+ m->bytepos = bytepos;
m->charpos = charpos;
if (m->buffer != b)
{
- unchain_marker (marker);
+ unchain_marker (m);
m->buffer = b;
- m->chain = BUF_MARKERS (b);
- BUF_MARKERS (b) = marker;
+ m->next = BUF_MARKERS (b);
+ BUF_MARKERS (b) = m;
}
-
+
return marker;
}
/* This version of set_marker_both won't let the position
be outside the visible part. */
-Lisp_Object
+Lisp_Object
set_marker_restricted_both (marker, buffer, charpos, bytepos)
Lisp_Object marker, buffer;
int charpos, bytepos;
register struct buffer *b;
register struct Lisp_Marker *m;
- CHECK_MARKER (marker, 0);
+ CHECK_MARKER (marker);
+ m = XMARKER (marker);
if (NILP (buffer))
b = current_buffer;
else
{
- CHECK_BUFFER (buffer, 1);
+ CHECK_BUFFER (buffer);
b = XBUFFER (buffer);
/* If buffer is dead, set marker to point nowhere. */
if (EQ (b->name, Qnil))
{
- unchain_marker (marker);
+ unchain_marker (m);
return marker;
}
}
- m = XMARKER (marker);
-
if (charpos < BUF_BEGV (b))
charpos = BUF_BEGV (b);
if (charpos > BUF_ZV (b))
if (charpos > bytepos)
abort ();
- if (bytepos > BUF_GPT_BYTE (b))
- bytepos += BUF_GAP_SIZE (b);
-
- m->bufpos = bytepos;
+ m->bytepos = bytepos;
m->charpos = charpos;
if (m->buffer != b)
{
- unchain_marker (marker);
+ unchain_marker (m);
m->buffer = b;
- m->chain = BUF_MARKERS (b);
- BUF_MARKERS (b) = marker;
+ m->next = BUF_MARKERS (b);
+ BUF_MARKERS (b) = m;
}
-
+
return marker;
}
\f
-/* This is called during garbage collection,
+/* Remove MARKER from the chain of whatever buffer it is in.
+ Leave it "in no buffer".
+
+ This is called during garbage collection,
so we must be careful to ignore and preserve mark bits,
including those in chain fields of markers. */
void
unchain_marker (marker)
- register Lisp_Object marker;
+ register struct Lisp_Marker *marker;
{
- register Lisp_Object tail, prev, next;
- register EMACS_INT omark;
+ register struct Lisp_Marker *tail, *prev, *next;
register struct buffer *b;
- b = XMARKER (marker)->buffer;
+ b = marker->buffer;
if (b == 0)
return;
if (EQ (b->name, Qnil))
abort ();
+ marker->buffer = 0;
+
tail = BUF_MARKERS (b);
- prev = Qnil;
- while (XSYMBOL (tail) != XSYMBOL (Qnil))
+ prev = NULL;
+ while (tail)
{
- next = XMARKER (tail)->chain;
- XUNMARK (next);
+ next = tail->next;
- if (XMARKER (marker) == XMARKER (tail))
+ if (marker == tail)
{
- if (NILP (prev))
+ if (!prev)
{
BUF_MARKERS (b) = next;
/* Deleting first marker from the buffer's chain. Crash
if new first marker in chain does not say it belongs
to the same buffer, or at least that they have the same
base buffer. */
- if (!NILP (next) && b->text != XMARKER (next)->buffer->text)
+ if (next && b->text != next->buffer->text)
abort ();
}
else
- {
- omark = XMARKBIT (XMARKER (prev)->chain);
- XMARKER (prev)->chain = next;
- XSETMARKBIT (XMARKER (prev)->chain, omark);
- }
- break;
+ prev->next = next;
+ /* We have removed the marker from the chain;
+ no need to scan the rest of the chain. */
+ return;
}
else
prev = tail;
tail = next;
}
- XMARKER (marker)->buffer = 0;
+
+ /* Marker was not in its chain. */
+ abort ();
}
/* Return the char position of marker MARKER, as a C integer. */
{
register struct Lisp_Marker *m = XMARKER (marker);
register struct buffer *buf = m->buffer;
- register int i = m->bufpos;
+ register int i = m->bytepos;
if (!buf)
error ("Marker does not point anywhere");
- if (i > BUF_GPT_BYTE (buf) + BUF_GAP_SIZE (buf))
- i -= BUF_GAP_SIZE (buf);
- else if (i > BUF_GPT_BYTE (buf))
- i = BUF_GPT_BYTE (buf);
-
if (i < BUF_BEG_BYTE (buf) || i > BUF_Z_BYTE (buf))
abort ();
}
\f
DEFUN ("copy-marker", Fcopy_marker, Scopy_marker, 1, 2, 0,
- "Return a new marker pointing at the same place as MARKER.\n\
-If argument is a number, makes a new marker pointing\n\
-at that position in the current buffer.\n\
-The optional argument TYPE specifies the insertion type of the new marker;\n\
-see `marker-insertion-type'.")
- (marker, type)
+ doc: /* Return a new marker pointing at the same place as MARKER.
+If argument is a number, makes a new marker pointing
+at that position in the current buffer.
+The optional argument TYPE specifies the insertion type of the new marker;
+see `marker-insertion-type'. */)
+ (marker, type)
register Lisp_Object marker, type;
{
register Lisp_Object new;
- if (INTEGERP (marker) || MARKERP (marker))
- {
- new = Fmake_marker ();
- Fset_marker (new, marker,
- (MARKERP (marker) ? Fmarker_buffer (marker) : Qnil));
- XMARKER (new)->insertion_type = !NILP (type);
- return new;
- }
- else
+ if (! (INTEGERP (marker) || MARKERP (marker)))
marker = wrong_type_argument (Qinteger_or_marker_p, marker);
+
+ new = Fmake_marker ();
+ Fset_marker (new, marker,
+ (MARKERP (marker) ? Fmarker_buffer (marker) : Qnil));
+ XMARKER (new)->insertion_type = !NILP (type);
+ return new;
}
DEFUN ("marker-insertion-type", Fmarker_insertion_type,
Smarker_insertion_type, 1, 1, 0,
- "Return insertion type of MARKER: t if it stays after inserted text.\n\
-nil means the marker stays before text inserted there.")
- (marker)
+ doc: /* Return insertion type of MARKER: t if it stays after inserted text.
+nil means the marker stays before text inserted there. */)
+ (marker)
register Lisp_Object marker;
{
- register Lisp_Object buf;
- CHECK_MARKER (marker, 0);
+ CHECK_MARKER (marker);
return XMARKER (marker)->insertion_type ? Qt : Qnil;
}
DEFUN ("set-marker-insertion-type", Fset_marker_insertion_type,
Sset_marker_insertion_type, 2, 2, 0,
- "Set the insertion-type of MARKER to TYPE.\n\
-If TYPE is t, it means the marker advances when you insert text at it.\n\
-If TYPE is nil, it means the marker stays behind when you insert text at it.")
- (marker, type)
+ doc: /* Set the insertion-type of MARKER to TYPE.
+If TYPE is t, it means the marker advances when you insert text at it.
+If TYPE is nil, it means the marker stays behind when you insert text at it. */)
+ (marker, type)
Lisp_Object marker, type;
{
- CHECK_MARKER (marker, 0);
+ CHECK_MARKER (marker);
XMARKER (marker)->insertion_type = ! NILP (type);
return type;
}
DEFUN ("buffer-has-markers-at", Fbuffer_has_markers_at, Sbuffer_has_markers_at,
- 1, 1, 0,
- "Return t if there are markers pointing at POSITION in the current buffer.")
- (position)
- Lisp_Object position;
+ 1, 1, 0,
+ doc: /* Return t if there are markers pointing at POSITION in the current buffer. */)
+ (position)
+ Lisp_Object position;
{
- register Lisp_Object tail;
+ register struct Lisp_Marker *tail;
register int charno;
charno = XINT (position);
if (charno > Z)
charno = Z;
- for (tail = BUF_MARKERS (current_buffer);
- XSYMBOL (tail) != XSYMBOL (Qnil);
- tail = XMARKER (tail)->chain)
- if (XMARKER (tail)->charpos == charno)
+ for (tail = BUF_MARKERS (current_buffer); tail; tail = tail->next)
+ if (tail->charpos == charno)
return Qt;
return Qnil;
}
+
+/* For debugging -- count the markers in buffer BUF. */
+
+int
+count_markers (buf)
+ struct buffer *buf;
+{
+ int total = 0;
+ struct Lisp_Marker *tail;
+
+ for (tail = BUF_MARKERS (buf); tail; tail = tail->next)
+ total++;
+
+ return total;
+}
\f
void
syms_of_marker ()
defsubr (&Smarker_insertion_type);
defsubr (&Sset_marker_insertion_type);
defsubr (&Sbuffer_has_markers_at);
+
+ DEFVAR_BOOL ("byte-debug-flag", &byte_debug_flag,
+ doc: /* Non-nil enables debugging checks in byte/char position conversions. */);
+ byte_debug_flag = 0;
}
+
+/* arch-tag: 50aa418f-cdd0-4838-b64b-94aa4b2a3b74
+ (do not change this comment) */