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buffer.c
1366 lines (1164 loc) · 42.9 KB
/
buffer.c
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/* Buffer manipulation primitives for GNU Emacs.
Copyright (C) 1985, 1986, 1987, 1988, 1990 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 1, 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. */
#include <sys/param.h>
#ifndef MAXPATHLEN
/* in 4.1, param.h fails to define this. */
#define MAXPATHLEN 1024
#endif /* not MAXPATHLEN */
#include "config.h"
#include "lisp.h"
#include "window.h"
#include "commands.h"
#include "buffer.h"
#include "syntax.h"
#include "process.h"
struct buffer *current_buffer; /* the current buffer */
/* First buffer in chain of all buffers (in reverse order of creation).
Threaded through ->next. */
struct buffer *all_buffers;
/* This structure holds the default values of the buffer-local variables
defined with DEFVAR_PER_BUFFER, that have special slots in each buffer.
The default value occupies the same slot in this structure
as an individual buffer's value occupies in that buffer.
Setting the default value also goes through the alist of buffers
and stores into each buffer that does not say it has a local value. */
struct buffer buffer_defaults;
/* A Lisp_Object pointer to the above, used for staticpro */
static Lisp_Object Vbuffer_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 -1, then even though there may
be a DEFVAR_PER_BUFFER for the slot, there is no default value for it;
and the corresponding slot in buffer_defaults is not used.
If a slot is -2, then there is no DEFVAR_PER_BUFFER for it,
but there is a default value which is copied into each buffer.
If a slot in this structure corresponding to a DEFVAR_PER_BUFFER is
zero, that is a bug */
struct buffer buffer_local_flags;
/* This structure holds the names of symbols whose values may be
buffer-local. It is indexed and accessed in the same way as the above. */
struct buffer buffer_local_symbols;
/* A Lisp_Object pointer to the above, used for staticpro */
static Lisp_Object Vbuffer_local_symbols;
/* Alist of all buffer names vs the buffers. */
/* This used to be a variable, but is no longer,
to prevent lossage due to user rplac'ing this alist or its elements. */
Lisp_Object Vbuffer_alist;
Lisp_Object Qfundamental_mode, Qmode_class;
Lisp_Object QSFundamental; /* A string "Fundamental" */
/* For debugging; temporary. See set_buffer_internal. */
/* Lisp_Object Qlisp_mode, Vcheck_symbol; */
void reset_buffer_local_variables (struct buffer *);
void
nsberror (spec)
Lisp_Object spec;
{
if (XTYPE (spec) == Lisp_String)
error ("No buffer named %s", XSTRING (spec)->data);
error ("Invalid buffer argument");
}
DEFUN ("buffer-list", Fbuffer_list, Sbuffer_list, 0, 0, 0,
"Return a list of all buffers.")
()
{
return Fmapcar (Qcdr, Vbuffer_alist);
}
DEFUN ("get-buffer", Fget_buffer, Sget_buffer, 1, 1, 0,
"Return the buffer named NAME (a string).\n\
It is found by looking up NAME in buffer-alist.\n\
If there is no buffer named NAME, nil is returned.\n\
NAME may also be a buffer; it is returned.")
(name)
register Lisp_Object name;
{
if (XTYPE (name) == Lisp_Buffer)
return name;
CHECK_STRING (name, 0);
return Fcdr (Fassoc (name, Vbuffer_alist));
}
DEFUN ("get-file-buffer", Fget_file_buffer, Sget_file_buffer, 1, 1, 0,
"Return the buffer visiting file FILENAME (a string).\n\
If there is no such buffer, nil is returned.")
(filename)
register Lisp_Object filename;
{
register Lisp_Object tail, buf, tem;
CHECK_STRING (filename, 0);
filename = Fexpand_file_name (filename, Qnil);
for (tail = Vbuffer_alist; CONSP (tail); tail = XCONS (tail)->cdr)
{
buf = Fcdr (XCONS (tail)->car);
if (XTYPE (buf) != Lisp_Buffer) continue;
if (XTYPE (XBUFFER (buf)->filename) != Lisp_String) continue;
tem = Fstring_equal (XBUFFER (buf)->filename, filename);
if (!NILP (tem))
return buf;
}
return Qnil;
}
DEFUN ("get-buffer-create", Fget_buffer_create, Sget_buffer_create, 1, 1, 0,
"Like get-buffer but creates a buffer named NAME and returns it if none already exists.")
(name)
register Lisp_Object name;
{
register Lisp_Object buf, function, tem;
int count = specpdl_ptr - specpdl;
register struct buffer *b;
register unsigned char *data;
/* register struct buffer *bx; */
buf = Fget_buffer (name);
if (!NILP (buf)) return buf;
b = (struct buffer *) malloc (sizeof (struct buffer));
if (!b) memory_full ();
BUF_GAP_SIZE (b) = 20;
data = (unsigned char *) malloc (BUF_GAP_SIZE (b));
if (!data)
{
free (b);
memory_full ();
}
BUF_BEG_ADDR (b) = data;
BUF_PT (b) = 1;
BUF_GPT (b) = 1;
BUF_BEGV (b) = 1;
BUF_ZV (b) = 1;
BUF_Z (b) = 1;
BUF_MODIFF (b) = 1;
/* Put this on the chain of all buffers including killed ones. */
b->next = all_buffers;
all_buffers = b;
/* Put this in the alist of all live buffers. */
XSET (buf, Lisp_Buffer, b);
#if 0
XSETTYPE (buf, Lisp_Buffer);
bx = b; /* Use of bx avoids compiler bug on Sun */
XSETBUFFER (buf, bx);
#endif
Vbuffer_alist = nconc2 (Vbuffer_alist, Fcons (Fcons (name, buf), Qnil));
b->mark = Fmake_marker ();
b->markers = Qnil;
b->name = name;
/* Enable undo in this buffer unless name starts with a space. */
if (XSTRING (name)->data[0] != ' ')
b->undo_list = Qnil;
else
b->undo_list = Qt;
reset_buffer (b);
function = buffer_defaults.major_mode;
if (NILP (function))
{
tem = Fget (current_buffer->major_mode, Qmode_class);
if (EQ (tem, Qnil))
function = current_buffer->major_mode;
}
if (NILP (function) || EQ (function, Qfundamental_mode))
return buf;
/* To select a nonfundamental mode,
select the buffer temporarily and then call the mode function. */
record_unwind_protect (save_excursion_restore, save_excursion_save ());
Fset_buffer (buf);
call0 (function);
unbind_to (count);
return buf;
}
/* Reinitialize everything about a buffer except its name and contents. */
void
reset_buffer (b)
register struct buffer *b;
{
b->filename = Qnil;
b->directory = (current_buffer) ? current_buffer->directory : Qnil;
b->modtime = 0;
b->save_modified = 1;
b->save_length = 0;
b->last_window_start = 1;
b->backed_up = Qnil;
b->auto_save_modified = 0;
b->auto_save_file_name = Qnil;
b->read_only = Qnil;
reset_buffer_local_variables(b);
}
void
reset_buffer_local_variables(b)
register struct buffer *b;
{
register int offset;
/* Reset the major mode to Fundamental, together with all the
things that depend on the major mode.
default-major-mode is handled at a higher level.
We ignore it here. */
b->major_mode = Qfundamental_mode;
b->keymap = Qnil;
b->abbrev_table = Vfundamental_mode_abbrev_table;
b->mode_name = QSFundamental;
/* Reset all per-buffer variables to their defaults. */
b->local_var_alist = Qnil;
b->local_var_flags = 0;
/* For each slot that has a default value,
copy that into the slot. */
for (offset = (char *)&buffer_local_flags.name - (char *)&buffer_local_flags;
offset < sizeof (struct buffer);
offset += sizeof (Lisp_Object)) /* sizeof int == sizeof Lisp_Object */
if (*(int *)(offset + (char *) &buffer_local_flags) > 0
|| *(int *)(offset + (char *) &buffer_local_flags) == -2)
*(Lisp_Object *)(offset + (char *)b) =
*(Lisp_Object *)(offset + (char *)&buffer_defaults);
}
DEFUN ("generate-new-buffer", Fgenerate_new_buffer, Sgenerate_new_buffer,
1, 1, 0,
"Creates and returns a buffer named NAME if one does not already exist,\n\
else tries adding successive suffixes to NAME until a new buffer-name is\n\
formed, then creates and returns a new buffer with that new name.")
(name)
register Lisp_Object name;
{
register Lisp_Object gentemp, tem;
int count;
char number[10];
CHECK_STRING (name, 0);
tem = Fget_buffer (name);
if (NILP (tem))
return Fget_buffer_create (name);
count = 1;
while (1)
{
sprintf (number, "<%d>", ++count);
gentemp = concat2 (name, build_string (number));
tem = Fget_buffer (gentemp);
if (NILP (tem))
return Fget_buffer_create (gentemp);
}
}
DEFUN ("buffer-name", Fbuffer_name, Sbuffer_name, 0, 1, 0,
"Return the name of BUFFER, as a string.\n\
No arg means return name of current buffer.")
(buffer)
register Lisp_Object buffer;
{
if (NILP (buffer))
return current_buffer->name;
CHECK_BUFFER (buffer, 0);
return XBUFFER (buffer)->name;
}
#ifdef NOTDEF /* Useless. If you need this, you should be using `eq'
DEFUN ("buffer-number", Fbuffer_number, Sbuffer_number, 0, 1, 0,
"Return the number of BUFFER.\n\
No arg means return number of current buffer.")
(buffer)
Lisp_Object buffer;
{
if (NILP (buffer))
return current_buffer->number;
CHECK_BUFFER (buffer, 0);
return XBUFFER (buffer)->number;
}
*/
#endif /* NOTDEF */
DEFUN ("buffer-file-name", Fbuffer_file_name, Sbuffer_file_name, 0, 1, 0,
"Return name of file BUFFER is visiting, or NIL if none.\n\
No argument means use current buffer as BUFFER.")
(buffer)
register Lisp_Object buffer;
{
if (NILP (buffer))
return current_buffer->filename;
CHECK_BUFFER (buffer, 0);
return XBUFFER (buffer)->filename;
}
DEFUN ("buffer-local-variables", Fbuffer_local_variables,
Sbuffer_local_variables, 0, 1, 0,
"Return alist of variables that are buffer-local in BUFFER.\n\
No argument means use current buffer as BUFFER.\n\
Each element of the value looks like (SYMBOL . VALUE).\n\
Note that storing new VALUEs in these elements\n\
does not change the local values.")
(buffer)
register Lisp_Object buffer;
{
register struct buffer *buf;
register Lisp_Object val;
if (NILP (buffer))
buf = current_buffer;
else
{
CHECK_BUFFER (buffer, 0);
buf = XBUFFER (buffer);
}
{
/* Reference each variable in the alist in our current buffer.
If inquiring about the current buffer, this gets the current values,
so store them into the alist so the alist is up to date.
If inquiring about some other buffer, this swaps out any values
for that buffer, making the alist up to date automatically. */
register Lisp_Object tem;
for (tem = buf->local_var_alist; CONSP (tem); tem = XCONS (tem)->cdr)
{
Lisp_Object v1 = Fsymbol_value (XCONS (XCONS (tem)->car)->car);
if (buf == current_buffer)
XCONS (XCONS (tem)->car)->cdr = v1;
}
}
/* Make a copy of the alist, to return it. */
val = Fcopy_alist (buf->local_var_alist);
/* Add on all the variables stored in special slots. */
{
register int offset, mask;
for (offset = (char *)&buffer_local_symbols.name - (char *)&buffer_local_symbols;
offset < sizeof (struct buffer);
offset += (sizeof (Lisp_Object)))
{
mask = *(int *)(offset + (char *) &buffer_local_flags);
if (mask == -1 || (buf->local_var_flags & mask))
if (XTYPE (*(Lisp_Object *)(offset + (char *)&buffer_local_symbols))
== Lisp_Symbol)
val = Fcons (Fcons (*(Lisp_Object *)(offset + (char *)&buffer_local_symbols),
*(Lisp_Object *)(offset + (char *)buf)),
val);
}
}
return (val);
}
DEFUN ("buffer-modified-p", Fbuffer_modified_p, Sbuffer_modified_p,
0, 1, 0,
"Return t if BUFFER is modified since file last read in or saved.\n\
No argument means use current buffer as BUFFER.")
(buffer)
register Lisp_Object buffer;
{
register struct buffer *buf;
if (NILP (buffer))
buf = current_buffer;
else
{
CHECK_BUFFER (buffer, 0);
buf = XBUFFER (buffer);
}
return buf->save_modified < BUF_MODIFF (buf) ? Qt : Qnil;
}
DEFUN ("set-buffer-modified-p", Fset_buffer_modified_p, Sset_buffer_modified_p,
1, 1, 0,
"Mark current buffer as modified or unmodified according to FLAG.")
(flag)
register Lisp_Object flag;
{
register int already;
register Lisp_Object fn;
#ifdef CLASH_DETECTION
/* If buffer becoming modified, lock the file.
If buffer becoming unmodified, unlock the file. */
fn = current_buffer->filename;
if (!NILP (fn))
{
already = current_buffer->save_modified < MODIFF;
if (!already && !NILP (flag))
lock_file (fn);
else if (already && NILP (flag))
unlock_file (fn);
}
#endif /* CLASH_DETECTION */
current_buffer->save_modified = NILP (flag) ? MODIFF : 0;
update_mode_lines++;
return flag;
}
DEFUN ("rename-buffer", Frename_buffer, Srename_buffer, 1, 1,
"sRename buffer (to new name): ",
"Change current buffer's name to NEWNAME (a string).")
(name)
register Lisp_Object name;
{
register Lisp_Object tem, buf;
CHECK_STRING (name, 0);
tem = Fget_buffer (name);
if (!NILP (tem))
error ("Buffer name \"%s\" is in use", XSTRING (name)->data);
XSET (buf, Lisp_Buffer, current_buffer);
tem = Fmemq (buf, Vminibuffer_list);
if (!NILP (tem))
error ("Cannot rename a minibuffer");
current_buffer->name = name;
Fsetcar (Frassq (buf, Vbuffer_alist), name);
if (NILP (current_buffer->filename) && !NILP (current_buffer->auto_save_file_name))
call0 (intern ("rename-auto-save-file"));
return Qnil;
}
DEFUN ("other-buffer", Fother_buffer, Sother_buffer, 0, 1, 0,
"Return most recently selected buffer other than BUFFER.\n\
Buffers not visible in windows are preferred to visible buffers.\n\
If no other exists, the buffer *scratch* is returned.\n\
If BUFFER is omitted or nil, some interesting buffer is returned.")
(buffer)
register Lisp_Object buffer;
{
register Lisp_Object tail, buf, notsogood, tem;
notsogood = Qnil;
for (tail = Vbuffer_alist; !NILP (tail); tail = Fcdr (tail))
{
buf = Fcdr (Fcar (tail));
if (EQ (buf, buffer))
continue;
if (XSTRING (XBUFFER (buf)->name)->data[0] == ' ')
continue;
tem = Fget_buffer_window (buf);
if (NILP (tem))
return buf;
if (NILP (notsogood))
notsogood = buf;
}
if (!NILP (notsogood))
return notsogood;
return Fget_buffer_create (build_string ("*scratch*"));
}
DEFUN ("buffer-flush-undo", Fbuffer_flush_undo, Sbuffer_flush_undo, 1, 1, 0,
"Make BUFFER stop keeping undo information.")
(buf)
register Lisp_Object buf;
{
CHECK_BUFFER (buf, 0);
XBUFFER (buf)->undo_list = Qt;
return Qnil;
}
DEFUN ("buffer-enable-undo", Fbuffer_enable_undo, Sbuffer_enable_undo,
0, 1, "",
"Start keeping undo information for buffer BUFFER (default is current buffer).")
(buf)
register Lisp_Object buf;
{
if (NILP (buf))
{
if (EQ (current_buffer->undo_list, Qt))
current_buffer->undo_list = Qnil;
}
else
{
CHECK_BUFFER (buf, 0);
if (EQ (XBUFFER (buf)->undo_list, Qt))
XBUFFER (buf)->undo_list = Qnil;
}
return Qnil;
}
DEFUN ("kill-buffer", Fkill_buffer, Skill_buffer, 1, 1, "bKill buffer: ",
"One arg, a string or a buffer. Get rid of the specified buffer.\n\
Any processes that have this buffer as the `process-buffer' are killed\n\
with `delete-process'.")
(bufname)
Lisp_Object bufname;
{
Lisp_Object buf;
register struct buffer *b;
register Lisp_Object tem;
register struct Lisp_Marker *m;
struct gcpro gcpro1, gcpro2;
if (NILP (bufname))
buf = Fcurrent_buffer ();
else
buf = Fget_buffer (bufname);
if (NILP (buf))
nsberror (bufname);
b = XBUFFER (buf);
if (FROM_KBD && !NILP (b->filename)
&& BUF_MODIFF (b) > b->save_modified)
{
GCPRO2 (buf, bufname);
tem = Fyes_or_no_p (format1 ("Buffer %s modified; kill anyway? ",
XSTRING (b->name)->data));
UNGCPRO;
if (NILP (tem))
return Qnil;
}
/* We have no more questions to ask. Verify that it is valid
to kill the buffer. This must be done after the questions
since anything can happen within Fyes_or_no_p. */
/* Don't kill the minibuffer now current. */
if (EQ (buf, XWINDOW (minibuf_window)->buffer))
return Qnil;
if (NILP (b->name))
return Qnil;
/* Make this buffer not be current.
In the process, notice if this is the sole visible buffer
and give up if so. */
if (b == current_buffer)
{
tem = Fother_buffer (buf);
Fset_buffer (tem);
if (b == current_buffer)
return Qnil;
}
/* Now there is no question: we can kill the buffer. */
#ifdef CLASH_DETECTION
/* Unlock this buffer's file, if it is locked. */
unlock_buffer (b);
#endif /* CLASH_DETECTION */
#ifdef subprocesses
kill_buffer_processes (buf);
#endif
tem = Vinhibit_quit;
Vinhibit_quit = Qt;
Vbuffer_alist = Fdelq (Frassq (buf, Vbuffer_alist), Vbuffer_alist);
Freplace_buffer_in_windows (buf);
Vinhibit_quit = tem;
/* Unchain all markers of this buffer
and leave them pointing nowhere. */
for (tem = b->markers; !EQ (tem, Qnil); )
{
m = XMARKER (tem);
m->buffer = 0;
tem = m->chain;
m->chain = Qnil;
}
b->markers = Qnil;
b->name = Qnil;
b->undo_list = Qnil;
free (BUF_BEG_ADDR (b));
return Qnil;
}
/* Put the element for buffer `buf' at the front of buffer-alist.
This is done when a buffer is selected "visibly".
It keeps buffer-alist in the order of recency of selection
so that other_buffer will return something nice. */
void
record_buffer (buf)
Lisp_Object buf;
{
register Lisp_Object link, prev;
prev = Qnil;
for (link = Vbuffer_alist; CONSP (link); link = XCONS (link)->cdr)
{
if (EQ (XCONS (XCONS (link)->car)->cdr, buf))
break;
prev = link;
}
/* Effectively do Vbuffer_alist = Fdelq (link, Vbuffer_alist)
but cannot use Fdelq here it that allows quitting. */
if (NILP (prev))
Vbuffer_alist = XCONS (Vbuffer_alist)->cdr;
else
XCONS (prev)->cdr = XCONS (XCONS (prev)->cdr)->cdr;
XCONS(link)->cdr = Vbuffer_alist;
Vbuffer_alist = link;
}
DEFUN ("switch-to-buffer", Fswitch_to_buffer, Sswitch_to_buffer, 1, 2, "BSwitch to buffer: ",
"Select buffer BUFFER in the current window.\n\
BUFFER may be a buffer or a buffer name.\n\
Optional second arg NORECORD non-nil means\n\
do not put this buffer at the front of the list of recently selected ones.\n\
\n\
WARNING: This is NOT the way to work on another buffer temporarily\n\
within a Lisp program! Use `set-buffer' instead. That avoids messing with\n\
the window-buffer correspondances.")
(bufname, norecord)
Lisp_Object bufname, norecord;
{
register Lisp_Object buf;
if (EQ (minibuf_window, selected_window))
error ("Cannot switch buffers in minibuffer window");
if (NILP (bufname))
buf = Fother_buffer (Fcurrent_buffer ());
else
buf = Fget_buffer_create (bufname);
Fset_buffer (buf);
if (NILP (norecord))
record_buffer (buf);
Fset_window_buffer (EQ (selected_window, minibuf_window)
? Fnext_window (minibuf_window, Qnil) : selected_window,
buf);
return Qnil;
}
DEFUN ("pop-to-buffer", Fpop_to_buffer, Spop_to_buffer, 1, 2, 0,
"Select buffer BUFFER in some window, preferably a different one.\n\
If pop-up-windows is non-nil, windows can be split to do this.\n\
If second arg OTHER-WINDOW is non-nil, insist on finding another\n\
window even if BUFFER is already visible in the selected window.")
(bufname, other)
Lisp_Object bufname, other;
{
register Lisp_Object buf;
if (NILP (bufname))
buf = Fother_buffer (Fcurrent_buffer ());
else
buf = Fget_buffer_create (bufname);
Fset_buffer (buf);
record_buffer (buf);
Fselect_window (Fdisplay_buffer (buf, other));
return Qnil;
}
DEFUN ("current-buffer", Fcurrent_buffer, Scurrent_buffer, 0, 0, 0,
"Return the current buffer as a Lisp buffer object.")
()
{
register Lisp_Object buf;
XSET (buf, Lisp_Buffer, current_buffer);
return buf;
}
DEFUN ("set-buffer", Fset_buffer, Sset_buffer, 1, 1, 0,
"Set the current buffer to the buffer or buffer name supplied as argument.\n\
That buffer will then be the default for editing operations and printing.\n\
This function's effect can't last past end of current command\n\
because returning to command level\n\
selects the chosen buffer of the current window,\n\
and this function has no effect on what buffer that is.\n\
See also `save-excursion' when you want to select a buffer temporarily.\n\
Use `switch-to-buffer' or `pop-to-buffer' for interactive buffer selection.")
(bufname)
register Lisp_Object bufname;
{
register Lisp_Object buffer;
buffer = Fget_buffer (bufname);
if (NILP (buffer))
nsberror (bufname);
if (NILP (XBUFFER (buffer)->name))
error ("Selecting deleted buffer");
set_buffer_internal (XBUFFER (buffer));
return buffer;
}
DEFUN ("barf-if-buffer-read-only", Fbarf_if_buffer_read_only,
Sbarf_if_buffer_read_only, 0, 0, 0,
"Signal a buffer-read-only error if the current buffer is read-only.")
()
{
while (!NILP (current_buffer->read_only))
Fsignal (Qbuffer_read_only, (Fcons (Fcurrent_buffer (), Qnil)));
return Qnil;
}
DEFUN ("bury-buffer", Fbury_buffer, Sbury_buffer, 0, 1, "",
"Put BUFFER at the end of the list of all buffers.\n\
There it is the least likely candidate for other-buffer to return;\n\
thus, the least likely buffer for \\[switch-to-buffer] to select by default.\n\
BUFFER is also removed from the selected window if it was displayed there.")
(buf)
register Lisp_Object buf;
{
register Lisp_Object aelt, link;
if (NILP (buf))
{
XSET (buf, Lisp_Buffer, current_buffer);
Fswitch_to_buffer (Fother_buffer (buf), Qnil);
}
else
{
Lisp_Object buf1;
buf1 = Fget_buffer (buf);
if (NILP (buf1))
nsberror (buf);
buf = buf1;
}
aelt = Frassq (buf, Vbuffer_alist);
link = Fmemq (aelt, Vbuffer_alist);
Vbuffer_alist = Fdelq (aelt, Vbuffer_alist);
XCONS (link)->cdr = Qnil;
Vbuffer_alist = nconc2 (Vbuffer_alist, link);
return Qnil;
}
extern int last_known_column_point;
/* Set the current buffer to B, which is a C pointer,
rather than a Lisp object. */
void
set_buffer_internal (b)
register struct buffer *b;
{
register struct buffer *swb = 0;
register struct buffer *old_buf;
register Lisp_Object tail, valcontents;
enum Lisp_Type tem;
if (current_buffer == b)
return;
#if 0
if (XWINDOW (selected_window) != 0)
swb = NILP (selected_window) ? 0 : XBUFFER (XWINDOW (selected_window)->buffer);
#endif
windows_or_buffers_changed = 1;
/* Vcheck_symbol is set up to the symbol paragraph-start
in order to check for the bug that clobbers it. */
/* if (current_buffer && EQ (current_buffer->major_mode, Qlisp_mode)
&& XFASTINT (Vcheck_symbol) != 0
&& !NILP (Vcheck_symbol))
{
valcontents = XSYMBOL (Vcheck_symbol)->value;
if (XTYPE (valcontents) != Lisp_Some_Buffer_Local_Value)
abort ();
if (current_buffer == XBUFFER (XCONS (XCONS (valcontents)->cdr)->car)
&& (XTYPE (XCONS (valcontents)->car) != Lisp_String
|| XSTRING (XCONS (valcontents)->car)->size != 6))
abort ();
}
*/
#if 0
if (current_buffer == swb && !NILP (selected_window))
Fset_marker (XWINDOW (selected_window)->pointm, make_number (point),
XWINDOW (selected_window)->buffer);
#endif
old_buf = current_buffer;
current_buffer = b;
#if 0
if (b == swb)
{
SET_PT (marker_position (XWINDOW (selected_window)->pointm));
if (point < BEGV)
point = BEGV;
if (point > ZV)
point = ZV;
}
#endif
last_known_column_point = -1; /* invalidate indentation cache */
/* Look down buffer's list of local Lisp variables
to find and update any that forward into C variables. */
for (tail = b->local_var_alist; !NILP (tail); tail = XCONS (tail)->cdr)
{
valcontents = XSYMBOL (XCONS (XCONS (tail)->car)->car)->value;
if ((XTYPE (valcontents) == Lisp_Buffer_Local_Value
|| XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value)
&& (tem = XTYPE (XCONS (valcontents)->car),
(tem == Lisp_Boolfwd || tem == Lisp_Intfwd
|| tem == Lisp_Objfwd)))
/* Just reference the variable
to cause it to become set for this buffer. */
Fsymbol_value (XCONS (XCONS (tail)->car)->car);
}
/* Do the same with any others that were local to the previous buffer */
if (old_buf)
for (tail = old_buf->local_var_alist; !NILP (tail); tail = XCONS (tail)->cdr)
{
valcontents = XSYMBOL (XCONS (XCONS (tail)->car)->car)->value;
if ((XTYPE (valcontents) == Lisp_Buffer_Local_Value
|| XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value)
&& (tem = XTYPE (XCONS (valcontents)->car),
(tem == Lisp_Boolfwd || tem == Lisp_Intfwd
|| tem == Lisp_Objfwd)))
/* Just reference the variable
to cause it to become set for this buffer. */
Fsymbol_value (XCONS (XCONS (tail)->car)->car);
}
/* Vcheck_symbol is set up to the symbol paragraph-start
in order to check for the bug that clobbers it. */
/*if (EQ (b->major_mode, Qlisp_mode)
&& Vcheck_symbol
&& !NILP (Vcheck_symbol))
{
valcontents = XSYMBOL (Vcheck_symbol)->value;
if (XTYPE (valcontents) != Lisp_Some_Buffer_Local_Value)
abort ();
if (b == XBUFFER (XCONS (XCONS (valcontents)->cdr)->car)
&& (XTYPE (XCONS (valcontents)->car) != Lisp_String
|| XSTRING (XCONS (valcontents)->car)->size != 6))
abort ();
Fsymbol_value (Vcheck_symbol);
valcontents = XSYMBOL (Vcheck_symbol)->value;
if (b != XBUFFER (XCONS (XCONS (valcontents)->cdr)->car)
|| XTYPE (XCONS (valcontents)->car) != Lisp_String
|| XSTRING (XCONS (valcontents)->car)->size != 6)
abort ();
}
*/
}
DEFUN ("erase-buffer", Ferase_buffer, Serase_buffer, 0, 0, 0,
"Delete the entire contents of the current buffer.")
()
{
Fwiden ();
del_range (BEG, Z);
current_buffer->last_window_start = 1;
/* Prevent warnings, or suspension of auto saving, that would happen
if future size is less than past size. Use of erase-buffer
implies that the future text is not really related to the past text. */
XFASTINT (current_buffer->save_length) = 0;
return Qnil;
}
void
validate_region (b, e)
register Lisp_Object *b, *e;
{
register Lisp_Object_Int i;
CHECK_NUMBER_COERCE_MARKER (*b, 0);
CHECK_NUMBER_COERCE_MARKER (*e, 1);
if (XINT (*b) > XINT (*e))
{
i = XFASTINT (*b); /* This is legit even if *b is < 0 */
*b = *e;
XFASTINT (*e) = i; /* because this is all we do with i. */
}
if (!(BEGV <= XINT (*b) && XINT (*b) <= XINT (*e)
&& XINT (*e) <= ZV))
args_out_of_range (*b, *e);
}
Lisp_Object
list_buffers_1 (files)
Lisp_Object files;
{
register Lisp_Object tail, tem, buf;
Lisp_Object col1, col2, col3, minspace;
register struct buffer *old = current_buffer, *b;
int desired_point = 0;
XFASTINT (col1) = 19;
XFASTINT (col2) = 25;
XFASTINT (col3) = 40;
XFASTINT (minspace) = 1;
Fset_buffer (Vstandard_output);
tail = intern ("Buffer-menu-mode");
if (!EQ (tail, current_buffer->major_mode)
&& (tem = Ffboundp (tail), !NILP (tem)))
call0 (tail);
Fbuffer_flush_undo (Vstandard_output);
current_buffer->read_only = Qnil;
write_string ("\
MR Buffer Size Mode File\n\
-- ------ ---- ---- ----\n", -1);
for (tail = Vbuffer_alist; !NILP (tail); tail = Fcdr (tail))
{
buf = Fcdr (Fcar (tail));
b = XBUFFER (buf);
/* Don't mention the minibuffers. */
if (XSTRING (b->name)->data[0] == ' ')
continue;
/* Optionally don't mention buffers that lack files. */
if (!NILP (files) && NILP (b->filename))
continue;
/* Identify the current buffer. */
if (b == old)
desired_point = point;
write_string (b == old ? "." : " ", -1);
/* Identify modified buffers */
write_string (BUF_MODIFF (b) > b->save_modified ? "*" : " ", -1);
write_string (NILP (b->read_only) ? " " : "% ", -1);
Fprinc (b->name, Qnil);
Findent_to (col1, make_number (2));
XFASTINT (tem) = BUF_Z (b) - BUF_BEG (b);
Fprin1 (tem, Qnil);
Findent_to (col2, minspace);
Fprinc (b->mode_name, Qnil);
Findent_to (col3, minspace);
if (!NILP (b->filename))
Fprinc (b->filename, Qnil);
write_string ("\n", -1);
}
current_buffer->read_only = Qt;
set_buffer_internal (old);
/* Foo. This doesn't work since temp_output_buffer_show sets point to 1
if (desired_point)
BUF_PT (XBUFFER (Vstandard_output)) = desired_point;
*/
return Qnil;
}
DEFUN ("list-buffers", Flist_buffers, Slist_buffers, 0, 1, "P",
"Display a list of names of existing buffers.\n\