text: /* vi:set ts=8 sts=4 sw=4 noet:
   *
   * VIM - Vi IMproved	by Bram Moolenaar
   *
   * Do ":help uganda"  in Vim to read copying and usage conditions.
   * Do ":help credits" in Vim to see a list of people who contributed.
   * See README.txt for an overview of the Vim source code.
   */
  
  /*
   * buffer.c: functions for dealing with the buffer structure
   */
  
  /*
   * The buffer list is a double linked list of all buffers.
   * Each buffer can be in one of these states:
   * never loaded: BF_NEVERLOADED is set, only the file name is valid
   *   not loaded: b_ml.ml_mfp == NULL, no memfile allocated
   *	 hidden: b_nwindows == 0, loaded but not displayed in a window
   *	 normal: loaded and displayed in a window
   *
   * Instead of storing file names all over the place, each file name is
   * stored in the buffer list. It can be referenced by a number.
   *
   * The current implementation remembers all file names ever used.
   */
  
  #include "vim.h"
  
  
  #ifdef FEAT_EVAL
  // Determines how deeply nested %{} blocks will be evaluated in statusline.
  # define MAX_STL_EVAL_DEPTH 100
  #endif
  
  static void	enter_buffer(buf_T *buf);
  static void	buflist_getfpos(void);
  static char_u	*buflist_match(regmatch_T *rmp, buf_T *buf, int ignore_case);
  static char_u	*fname_match(regmatch_T *rmp, char_u *name, int ignore_case);
  #ifdef UNIX
  static buf_T	*buflist_findname_stat(char_u *ffname, stat_T *st);
  static int	otherfile_buf(buf_T *buf, char_u *ffname, stat_T *stp);
  static int	buf_same_ino(buf_T *buf, stat_T *stp);
  #else
  static int	otherfile_buf(buf_T *buf, char_u *ffname);
  #endif
  static int	value_changed(char_u *str, char_u **last);
  static int	append_arg_number(win_T *wp, char_u *buf, int buflen, int add_file);
  static void	free_buffer(buf_T *);
  static void	free_buffer_stuff(buf_T *buf, int free_options);
  static void	clear_wininfo(buf_T *buf);
  
  #ifdef UNIX
  # define dev_T dev_t
  #else
  # define dev_T unsigned
  #endif
  
  #define FOR_ALL_BUFS_FROM_LAST(buf) \
      for ((buf) = lastbuf; (buf) != NULL; (buf) = (buf)->b_prev)
  
  #if defined(FEAT_QUICKFIX)
  static char *msg_loclist = N_("[Location List]");
  static char *msg_qflist = N_("[Quickfix List]");
  #endif
  
  // Number of times free_buffer() was called.
  static int	buf_free_count = 0;
  
  static int	top_file_num = 1;	// highest file number
  static garray_T buf_reuse = GA_EMPTY;	// file numbers to recycle
  
  /*
   * Return the highest possible buffer number.
   */
      int
  get_highest_fnum(void)
  {
      return top_file_num - 1;
  }
  
  /*
   * Read data from buffer for retrying.
   */
      static int
  read_buffer(
      int		read_stdin,	    // read file from stdin, otherwise fifo
      exarg_T	*eap,		    // for forced 'ff' and 'fenc' or NULL
      int		flags)		    // extra flags for readfile()
  {
      int		retval = OK;
      linenr_T	line_count;
  
      // Read from the buffer which the text is already filled in and append at
      // the end.  This makes it possible to retry when 'fileformat' or
      // 'fileencoding' was guessed wrong.
      line_count = curbuf->b_ml.ml_line_count;
      retval = readfile(
  	    read_stdin ? NULL : curbuf->b_ffname,
  	    read_stdin ? NULL : curbuf->b_fname,
  	    line_count, (linenr_T)0, (linenr_T)MAXLNUM, eap,
  	    flags | READ_BUFFER);
      if (retval == OK)
      {
  	// Delete the binary lines.
  	while (--line_count >= 0)
  	    ml_delete((linenr_T)1);
      }
      else
      {
  	// Delete the converted lines.
  	while (curbuf->b_ml.ml_line_count > line_count)
  	    ml_delete(line_count);
      }
      // Put the cursor on the first line.
      curwin->w_cursor.lnum = 1;
      curwin->w_cursor.col = 0;
  
      if (read_stdin)
      {
  	// Set or reset 'modified' before executing autocommands, so that
  	// it can be changed there.
  	if (!readonlymode && !BUFEMPTY())
  	    changed();
  	else if (retval == OK)
  	    unchanged(curbuf, FALSE, TRUE);
  
  	if (retval == OK)
  	{
  #ifdef FEAT_EVAL
  	    apply_autocmds_retval(EVENT_STDINREADPOST, NULL, NULL, FALSE,
  							      curbuf, &retval);
  #else
  	    apply_autocmds(EVENT_STDINREADPOST, NULL, NULL, FALSE, curbuf);
  #endif
  	}
      }
      return retval;
  }
  
  #if defined(FEAT_EVAL) || defined(PROTO)
  /*
   * Ensure buffer "buf" is loaded.  Does not trigger the swap-exists action.
   */
      void
  buffer_ensure_loaded(buf_T *buf)
  {
      if (buf->b_ml.ml_mfp == NULL)
      {
  	aco_save_T	aco;
  
  	aucmd_prepbuf(&aco, buf);
  	if (swap_exists_action != SEA_READONLY)
  	    swap_exists_action = SEA_NONE;
  	open_buffer(FALSE, NULL, 0);
  	aucmd_restbuf(&aco);
      }
  }
  #endif
  
  /*
   * Open current buffer, that is: open the memfile and read the file into
   * memory.
   * Return FAIL for failure, OK otherwise.
   */
      int
  open_buffer(
      int		read_stdin,	    // read file from stdin
      exarg_T	*eap,		    // for forced 'ff' and 'fenc' or NULL
      int		flags)		    // extra flags for readfile()
  {
      int		retval = OK;
      bufref_T	old_curbuf;
  #ifdef FEAT_SYN_HL
      long	old_tw = curbuf->b_p_tw;
  #endif
      int		read_fifo = FALSE;
  
      // The 'readonly' flag is only set when BF_NEVERLOADED is being reset.
      // When re-entering the same buffer, it should not change, because the
      // user may have reset the flag by hand.
      if (readonlymode && curbuf->b_ffname != NULL
  					&& (curbuf->b_flags & BF_NEVERLOADED))
  	curbuf->b_p_ro = TRUE;
  
      if (ml_open(curbuf) == FAIL)
      {
  	// There MUST be a memfile, otherwise we can't do anything
  	// If we can't create one for the current buffer, take another buffer
  	close_buffer(NULL, curbuf, 0, FALSE, FALSE);
  	FOR_ALL_BUFFERS(curbuf)
  	    if (curbuf->b_ml.ml_mfp != NULL)
  		break;
  	// If there is no memfile at all, exit.
  	// This is OK, since there are no changes to lose.
  	if (curbuf == NULL)
  	{
  	    emsg(_(e_cannot_allocate_any_buffer_exiting));
  
  	    // Don't try to do any saving, with "curbuf" NULL almost nothing
  	    // will work.
  	    v_dying = 2;
  	    getout(2);
  	}
  
  	emsg(_(e_cannot_allocate_buffer_using_other_one));
  	enter_buffer(curbuf);
  #ifdef FEAT_SYN_HL
  	if (old_tw != curbuf->b_p_tw)
  	    check_colorcolumn(curwin);
  #endif
  	return FAIL;
      }
  
      // The autocommands in readfile() may change the buffer, but only AFTER
      // reading the file.
      set_bufref(&old_curbuf, curbuf);
      modified_was_set = FALSE;
  
      // mark cursor position as being invalid
      curwin->w_valid = 0;
  
      if (curbuf->b_ffname != NULL
  #ifdef FEAT_NETBEANS_INTG
  	    && netbeansReadFile
  #endif
         )
      {
  	int old_msg_silent = msg_silent;
  #ifdef UNIX
  	int save_bin = curbuf->b_p_bin;
  	int perm;
  #endif
  #ifdef FEAT_NETBEANS_INTG
  	int oldFire = netbeansFireChanges;
  
  	netbeansFireChanges = 0;
  #endif
  #ifdef UNIX
  	perm = mch_getperm(curbuf->b_ffname);
  	if (perm >= 0 && (S_ISFIFO(perm)
  		      || S_ISSOCK(perm)
  # ifdef OPEN_CHR_FILES
  		      || (S_ISCHR(perm) && is_dev_fd_file(curbuf->b_ffname))
  # endif
  		    ))
  		read_fifo = TRUE;
  	if (read_fifo)
  	    curbuf->b_p_bin = TRUE;
  #endif
  	if (shortmess(SHM_FILEINFO))
  	    msg_silent = 1;
  	retval = readfile(curbuf->b_ffname, curbuf->b_fname,
  		  (linenr_T)0, (linenr_T)0, (linenr_T)MAXLNUM, eap,
  		  flags | READ_NEW | (read_fifo ? READ_FIFO : 0));
  #ifdef UNIX
  	if (read_fifo)
  	{
  	    curbuf->b_p_bin = save_bin;
  	    if (retval == OK)
  		retval = read_buffer(FALSE, eap, flags);
  	}
  #endif
  	msg_silent = old_msg_silent;
  #ifdef FEAT_NETBEANS_INTG
  	netbeansFireChanges = oldFire;
  #endif
  	// Help buffer is filtered.
  	if (bt_help(curbuf))
  	    fix_help_buffer();
      }
      else if (read_stdin)
      {
  	int	save_bin = curbuf->b_p_bin;
  
  	// First read the text in binary mode into the buffer.
  	// Then read from that same buffer and append at the end.  This makes
  	// it possible to retry when 'fileformat' or 'fileencoding' was
  	// guessed wrong.
  	curbuf->b_p_bin = TRUE;
  	retval = readfile(NULL, NULL, (linenr_T)0,
  		  (linenr_T)0, (linenr_T)MAXLNUM, NULL,
  		  flags | (READ_NEW + READ_STDIN));
  	curbuf->b_p_bin = save_bin;
  	if (retval == OK)
  	    retval = read_buffer(TRUE, eap, flags);
      }
  
      // if first time loading this buffer, init b_chartab[]
      if (curbuf->b_flags & BF_NEVERLOADED)
      {
  	(void)buf_init_chartab(curbuf, FALSE);
  #ifdef FEAT_CINDENT
  	parse_cino(curbuf);
  #endif
      }
  
      // Set/reset the Changed flag first, autocmds may change the buffer.
      // Apply the automatic commands, before processing the modelines.
      // So the modelines have priority over autocommands.
      //
      // When reading stdin, the buffer contents always needs writing, so set
      // the changed flag.  Unless in readonly mode: "ls | gview -".
      // When interrupted and 'cpoptions' contains 'i' set changed flag.
      if ((got_int && vim_strchr(p_cpo, CPO_INTMOD) != NULL)
  		|| modified_was_set	// ":set modified" used in autocmd
  #ifdef FEAT_EVAL
  		|| (aborting() && vim_strchr(p_cpo, CPO_INTMOD) != NULL)
  #endif
         )
  	changed();
      else if (retval == OK && !read_stdin && !read_fifo)
  	unchanged(curbuf, FALSE, TRUE);
      save_file_ff(curbuf);		// keep this fileformat
  
      // Set last_changedtick to avoid triggering a TextChanged autocommand right
      // after it was added.
      curbuf->b_last_changedtick = CHANGEDTICK(curbuf);
      curbuf->b_last_changedtick_i = CHANGEDTICK(curbuf);
      curbuf->b_last_changedtick_pum = CHANGEDTICK(curbuf);
  
      // require "!" to overwrite the file, because it wasn't read completely
  #ifdef FEAT_EVAL
      if (aborting())
  #else
      if (got_int)
  #endif
  	curbuf->b_flags |= BF_READERR;
  
  #ifdef FEAT_FOLDING
      // Need to update automatic folding.  Do this before the autocommands,
      // they may use the fold info.
      foldUpdateAll(curwin);
  #endif
  
      // need to set w_topline, unless some autocommand already did that.
      if (!(curwin->w_valid & VALID_TOPLINE))
      {
  	curwin->w_topline = 1;
  #ifdef FEAT_DIFF
  	curwin->w_topfill = 0;
  #endif
      }
  #ifdef FEAT_EVAL
      apply_autocmds_retval(EVENT_BUFENTER, NULL, NULL, FALSE, curbuf, &retval);
  #else
      apply_autocmds(EVENT_BUFENTER, NULL, NULL, FALSE, curbuf);
  #endif
  
      if (retval == OK)
      {
  	// The autocommands may have changed the current buffer.  Apply the
  	// modelines to the correct buffer, if it still exists and is loaded.
  	if (bufref_valid(&old_curbuf) && old_curbuf.br_buf->b_ml.ml_mfp != NULL)
  	{
  	    aco_save_T	aco;
  
  	    // Go to the buffer that was opened.
  	    aucmd_prepbuf(&aco, old_curbuf.br_buf);
  	    do_modelines(0);
  	    curbuf->b_flags &= ~(BF_CHECK_RO | BF_NEVERLOADED);
  
  	    if ((flags & READ_NOWINENTER) == 0)
  #ifdef FEAT_EVAL
  		apply_autocmds_retval(EVENT_BUFWINENTER, NULL, NULL, FALSE,
  							      curbuf, &retval);
  #else
  		apply_autocmds(EVENT_BUFWINENTER, NULL, NULL, FALSE, curbuf);
  #endif
  
  	    // restore curwin/curbuf and a few other things
  	    aucmd_restbuf(&aco);
  	}
      }
  
      return retval;
  }
  
  /*
   * Store "buf" in "bufref" and set the free count.
   */
      void
  set_bufref(bufref_T *bufref, buf_T *buf)
  {
      bufref->br_buf = buf;
      bufref->br_fnum = buf == NULL ? 0 : buf->b_fnum;
      bufref->br_buf_free_count = buf_free_count;
  }
  
  /*
   * Return TRUE if "bufref->br_buf" points to the same buffer as when
   * set_bufref() was called and it is a valid buffer.
   * Only goes through the buffer list if buf_free_count changed.
   * Also checks if b_fnum is still the same, a :bwipe followed by :new might get
   * the same allocated memory, but it's a different buffer.
   */
      int
  bufref_valid(bufref_T *bufref)
  {
      return bufref->br_buf_free_count == buf_free_count
  	? TRUE : buf_valid(bufref->br_buf)
  				  && bufref->br_fnum == bufref->br_buf->b_fnum;
  }
  
  /*
   * Return TRUE if "buf" points to a valid buffer (in the buffer list).
   * This can be slow if there are many buffers, prefer using bufref_valid().
   */
      int
  buf_valid(buf_T *buf)
  {
      buf_T	*bp;
  
      // Assume that we more often have a recent buffer, start with the last
      // one.
      FOR_ALL_BUFS_FROM_LAST(bp)
  	if (bp == buf)
  	    return TRUE;
      return FALSE;
  }
  
  /*
   * A hash table used to quickly lookup a buffer by its number.
   */
  static hashtab_T buf_hashtab;
  
      static void
  buf_hashtab_add(buf_T *buf)
  {
      sprintf((char *)buf->b_key, "%x", buf->b_fnum);
      if (hash_add(&buf_hashtab, buf->b_key) == FAIL)
  	emsg(_(e_buffer_cannot_be_registered));
  }
  
      static void
  buf_hashtab_remove(buf_T *buf)
  {
      hashitem_T *hi = hash_find(&buf_hashtab, buf->b_key);
  
      if (!HASHITEM_EMPTY(hi))
  	hash_remove(&buf_hashtab, hi);
  }
  
  /*
   * Return TRUE when buffer "buf" can be unloaded.
   * Give an error message and return FALSE when the buffer is locked or the
   * screen is being redrawn and the buffer is in a window.
   */
      static int
  can_unload_buffer(buf_T *buf)
  {
      int	    can_unload = !buf->b_locked;
  
      if (can_unload && updating_screen)
      {
  	win_T	*wp;
  
  	FOR_ALL_WINDOWS(wp)
  	    if (wp->w_buffer == buf)
  	    {
  		can_unload = FALSE;
  		break;
  	    }
      }
      if (!can_unload)
  	semsg(_(e_attempt_to_delete_buffer_that_is_in_use_str), buf->b_fname);
      return can_unload;
  }
  
  /*
   * Close the link to a buffer.
   * "action" is used when there is no longer a window for the buffer.
   * It can be:
   * 0			buffer becomes hidden
   * DOBUF_UNLOAD		buffer is unloaded
   * DOBUF_DELETE		buffer is unloaded and removed from buffer list
   * DOBUF_WIPE		buffer is unloaded and really deleted
   * DOBUF_WIPE_REUSE	idem, and add to buf_reuse list
   * When doing all but the first one on the current buffer, the caller should
   * get a new buffer very soon!
   *
   * The 'bufhidden' option can force freeing and deleting.
   *
   * When "abort_if_last" is TRUE then do not close the buffer if autocommands
   * cause there to be only one window with this buffer.  e.g. when ":quit" is
   * supposed to close the window but autocommands close all other windows.
   *
   * When "ignore_abort" is TRUE don't abort even when aborting() returns TRUE.
   *
   * Return TRUE when we got to the end and b_nwindows was decremented.
   */
      int
  close_buffer(
      win_T	*win,		// if not NULL, set b_last_cursor
      buf_T	*buf,
      int		action,
      int		abort_if_last,
      int		ignore_abort)
  {
      int		is_curbuf;
      int		nwindows;
      bufref_T	bufref;
      int		is_curwin = (curwin != NULL && curwin->w_buffer == buf);
      win_T	*the_curwin = curwin;
      tabpage_T	*the_curtab = curtab;
      int		unload_buf = (action != 0);
      int		wipe_buf = (action == DOBUF_WIPE || action == DOBUF_WIPE_REUSE);
      int		del_buf = (action == DOBUF_DEL || wipe_buf);
  
      CHECK_CURBUF;
  
      // Force unloading or deleting when 'bufhidden' says so.
      // The caller must take care of NOT deleting/freeing when 'bufhidden' is
      // "hide" (otherwise we could never free or delete a buffer).
      if (buf->b_p_bh[0] == 'd')		// 'bufhidden' == "delete"
      {
  	del_buf = TRUE;
  	unload_buf = TRUE;
      }
      else if (buf->b_p_bh[0] == 'w')	// 'bufhidden' == "wipe"
      {
  	del_buf = TRUE;
  	unload_buf = TRUE;
  	wipe_buf = TRUE;
      }
      else if (buf->b_p_bh[0] == 'u')	// 'bufhidden' == "unload"
  	unload_buf = TRUE;
  
  #ifdef FEAT_TERMINAL
      if (bt_terminal(buf) && (buf->b_nwindows == 1 || del_buf))
      {
  	CHECK_CURBUF;
  	if (term_job_running(buf->b_term))
  	{
  	    if (wipe_buf || unload_buf)
  	    {
  		if (!can_unload_buffer(buf))
  		    return FALSE;
  
  		// Wiping out or unloading a terminal buffer kills the job.
  		free_terminal(buf);
  	    }
  	    else
  	    {
  		// The job keeps running, hide the buffer.
  		del_buf = FALSE;
  		unload_buf = FALSE;
  	    }
  	}
  	else if (buf->b_p_bh[0] == 'h' && !del_buf)
  	{
  	    // Hide a terminal buffer.
  	    unload_buf = FALSE;
  	}
  	else
  	{
  	    // A terminal buffer is wiped out if the job has finished.
  	    del_buf = TRUE;
  	    unload_buf = TRUE;
  	    wipe_buf = TRUE;
  	}
  	CHECK_CURBUF;
      }
  #endif
  
      // Disallow deleting the buffer when it is locked (already being closed or
      // halfway a command that relies on it). Unloading is allowed.
      if ((del_buf || wipe_buf) && !can_unload_buffer(buf))
  	return FALSE;
  
      // check no autocommands closed the window
      if (win != NULL && win_valid_any_tab(win))
      {
  	// Set b_last_cursor when closing the last window for the buffer.
  	// Remember the last cursor position and window options of the buffer.
  	// This used to be only for the current window, but then options like
  	// 'foldmethod' may be lost with a ":only" command.
  	if (buf->b_nwindows == 1)
  	    set_last_cursor(win);
  	buflist_setfpos(buf, win,
  		    win->w_cursor.lnum == 1 ? 0 : win->w_cursor.lnum,
  		    win->w_cursor.col, TRUE);
      }
  
      set_bufref(&bufref, buf);
  
      // When the buffer is no longer in a window, trigger BufWinLeave
      if (buf->b_nwindows == 1)
      {
  	++buf->b_locked;
  	++buf->b_locked_split;
  	if (apply_autocmds(EVENT_BUFWINLEAVE, buf->b_fname, buf->b_fname,
  								  FALSE, buf)
  		&& !bufref_valid(&bufref))
  	{
  	    // Autocommands deleted the buffer.
  aucmd_abort:
  	    emsg(_(e_autocommands_caused_command_to_abort));
  	    return FALSE;
  	}
  	--buf->b_locked;
  	--buf->b_locked_split;
  	if (abort_if_last && one_window())
  	    // Autocommands made this the only window.
  	    goto aucmd_abort;
  
  	// When the buffer becomes hidden, but is not unloaded, trigger
  	// BufHidden
  	if (!unload_buf)
  	{
  	    ++buf->b_locked;
  	    ++buf->b_locked_split;
  	    if (apply_autocmds(EVENT_BUFHIDDEN, buf->b_fname, buf->b_fname,
  								  FALSE, buf)
  		    && !bufref_valid(&bufref))
  		// Autocommands deleted the buffer.
  		goto aucmd_abort;
  	    --buf->b_locked;
  	    --buf->b_locked_split;
  	    if (abort_if_last && one_window())
  		// Autocommands made this the only window.
  		goto aucmd_abort;
  	}
  #ifdef FEAT_EVAL
  	// autocmds may abort script processing
  	if (!ignore_abort && aborting())
  	    return FALSE;
  #endif
      }
  
      // If the buffer was in curwin and the window has changed, go back to that
      // window, if it still exists.  This avoids that ":edit x" triggering a
      // "tabnext" BufUnload autocmd leaves a window behind without a buffer.
      if (is_curwin && curwin != the_curwin &&  win_valid_any_tab(the_curwin))
      {
  	block_autocmds();
  	goto_tabpage_win(the_curtab, the_curwin);
  	unblock_autocmds();
      }
  
      nwindows = buf->b_nwindows;
  
      // decrease the link count from windows (unless not in any window)
      if (buf->b_nwindows > 0)
  	--buf->b_nwindows;
  
  #ifdef FEAT_DIFF
      if (diffopt_hiddenoff() && !unload_buf && buf->b_nwindows == 0)
  	diff_buf_delete(buf);	// Clear 'diff' for hidden buffer.
  #endif
  
      // Return when a window is displaying the buffer or when it's not
      // unloaded.
      if (buf->b_nwindows > 0 || !unload_buf)
  	return FALSE;
  
      // Always remove the buffer when there is no file name.
      if (buf->b_ffname == NULL)
  	del_buf = TRUE;
  
      // When closing the current buffer stop Visual mode before freeing
      // anything.
      if (buf == curbuf && VIsual_active
  #if defined(EXITFREE)
  	    && !entered_free_all_mem
  #endif
  	    )
  	end_visual_mode();
  
      // Free all things allocated for this buffer.
      // Also calls the "BufDelete" autocommands when del_buf is TRUE.
      //
      // Remember if we are closing the current buffer.  Restore the number of
      // windows, so that autocommands in buf_freeall() don't get confused.
      is_curbuf = (buf == curbuf);
      buf->b_nwindows = nwindows;
  
      buf_freeall(buf, (del_buf ? BFA_DEL : 0)
  		   + (wipe_buf ? BFA_WIPE : 0)
  		   + (ignore_abort ? BFA_IGNORE_ABORT : 0));
  
      // Autocommands may have deleted the buffer.
      if (!bufref_valid(&bufref))
  	return FALSE;
  #ifdef FEAT_EVAL
      // autocmds may abort script processing
      if (!ignore_abort && aborting())
  	return FALSE;
  #endif
  
      // It's possible that autocommands change curbuf to the one being deleted.
      // This might cause the previous curbuf to be deleted unexpectedly.  But
      // in some cases it's OK to delete the curbuf, because a new one is
      // obtained anyway.  Therefore only return if curbuf changed to the
      // deleted buffer.
      if (buf == curbuf && !is_curbuf)
  	return FALSE;
  
      if (win_valid_any_tab(win) && win->w_buffer == buf)
  	win->w_buffer = NULL;  // make sure we don't use the buffer now
  
      // Autocommands may have opened or closed windows for this buffer.
      // Decrement the count for the close we do here.
      if (buf->b_nwindows > 0)
  	--buf->b_nwindows;
  
      /*
       * Remove the buffer from the list.
       */
      if (wipe_buf)
      {
  	// Do not wipe out the buffer if it is used in a window.
  	if (buf->b_nwindows > 0)
  	    return FALSE;
  
  	if (action == DOBUF_WIPE_REUSE)
  	{
  	    // we can re-use this buffer number, store it
  	    if (buf_reuse.ga_itemsize == 0)
  		ga_init2(&buf_reuse, sizeof(int), 50);
  	    if (ga_grow(&buf_reuse, 1) == OK)
  		((int *)buf_reuse.ga_data)[buf_reuse.ga_len++] = buf->b_fnum;
  	}
  	if (buf->b_sfname != buf->b_ffname)
  	    VIM_CLEAR(buf->b_sfname);
  	else
  	    buf->b_sfname = NULL;
  	VIM_CLEAR(buf->b_ffname);
  	if (buf->b_prev == NULL)
  	    firstbuf = buf->b_next;
  	else
  	    buf->b_prev->b_next = buf->b_next;
  	if (buf->b_next == NULL)
  	    lastbuf = buf->b_prev;
  	else
  	    buf->b_next->b_prev = buf->b_prev;
  	free_buffer(buf);
      }
      else
      {
  	if (del_buf)
  	{
  	    // Free all internal variables and reset option values, to make
  	    // ":bdel" compatible with Vim 5.7.
  	    free_buffer_stuff(buf, TRUE);
  
  	    // Make it look like a new buffer.
  	    buf->b_flags = BF_CHECK_RO | BF_NEVERLOADED;
  
  	    // Init the options when loaded again.
  	    buf->b_p_initialized = FALSE;
  	}
  	buf_clear_file(buf);
  	if (del_buf)
  	    buf->b_p_bl = FALSE;
      }
      // NOTE: at this point "curbuf" may be invalid!
      return TRUE;
  }
  
  /*
   * Make buffer not contain a file.
   */
      void
  buf_clear_file(buf_T *buf)
  {
      buf->b_ml.ml_line_count = 1;
      unchanged(buf, TRUE, TRUE);
      buf->b_shortname = FALSE;
      buf->b_p_eol = TRUE;
      buf->b_start_eol = TRUE;
      buf->b_p_bomb = FALSE;
      buf->b_start_bomb = FALSE;
      buf->b_ml.ml_mfp = NULL;
      buf->b_ml.ml_flags = ML_EMPTY;		// empty buffer
  #ifdef FEAT_NETBEANS_INTG
      netbeans_deleted_all_lines(buf);
  #endif
  }
  
  /*
   * buf_freeall() - free all things allocated for a buffer that are related to
   * the file.  Careful: get here with "curwin" NULL when exiting.
   * flags:
   * BFA_DEL	     buffer is going to be deleted
   * BFA_WIPE	     buffer is going to be wiped out
   * BFA_KEEP_UNDO     do not free undo information
   * BFA_IGNORE_ABORT  don't abort even when aborting() returns TRUE
   */
      void
  buf_freeall(buf_T *buf, int flags)
  {
      int		is_curbuf = (buf == curbuf);
      bufref_T	bufref;
      int		is_curwin = (curwin != NULL && curwin->w_buffer == buf);
      win_T	*the_curwin = curwin;
      tabpage_T	*the_curtab = curtab;
  
      // Make sure the buffer isn't closed by autocommands.
      ++buf->b_locked;
      ++buf->b_locked_split;
      set_bufref(&bufref, buf);
      if (buf->b_ml.ml_mfp != NULL)
      {
  	if (apply_autocmds(EVENT_BUFUNLOAD, buf->b_fname, buf->b_fname,
  								  FALSE, buf)
  		&& !bufref_valid(&bufref))
  	    // autocommands deleted the buffer
  	    return;
      }
      if ((flags & BFA_DEL) && buf->b_p_bl)
      {
  	if (apply_autocmds(EVENT_BUFDELETE, buf->b_fname, buf->b_fname,
  								   FALSE, buf)
  		&& !bufref_valid(&bufref))
  	    // autocommands deleted the buffer
  	    return;
      }
      if (flags & BFA_WIPE)
      {
  	if (apply_autocmds(EVENT_BUFWIPEOUT, buf->b_fname, buf->b_fname,
  								  FALSE, buf)
  		&& !bufref_valid(&bufref))
  	    // autocommands deleted the buffer
  	    return;
      }
      --buf->b_locked;
      --buf->b_locked_split;
  
      // If the buffer was in curwin and the window has changed, go back to that
      // window, if it still exists.  This avoids that ":edit x" triggering a
      // "tabnext" BufUnload autocmd leaves a window behind without a buffer.
      if (is_curwin && curwin != the_curwin &&  win_valid_any_tab(the_curwin))
      {
  	block_autocmds();
  	goto_tabpage_win(the_curtab, the_curwin);
  	unblock_autocmds();
      }
  
  #ifdef FEAT_EVAL
      // autocmds may abort script processing
      if ((flags & BFA_IGNORE_ABORT) == 0 && aborting())
  	return;
  #endif
  
      // It's possible that autocommands change curbuf to the one being deleted.
      // This might cause curbuf to be deleted unexpectedly.  But in some cases
      // it's OK to delete the curbuf, because a new one is obtained anyway.
      // Therefore only return if curbuf changed to the deleted buffer.
      if (buf == curbuf && !is_curbuf)
  	return;
  #ifdef FEAT_DIFF
      diff_buf_delete(buf);	    // Can't use 'diff' for unloaded buffer.
  #endif
  #ifdef FEAT_SYN_HL
      // Remove any ownsyntax, unless exiting.
      if (curwin != NULL && curwin->w_buffer == buf)
  	reset_synblock(curwin);
  #endif
  
  #ifdef FEAT_FOLDING
      // No folds in an empty buffer.
      {
  	win_T		*win;
  	tabpage_T	*tp;
  
  	FOR_ALL_TAB_WINDOWS(tp, win)
  	    if (win->w_buffer == buf)
  		clearFolding(win);
      }
  #endif
  
  #ifdef FEAT_TCL
      tcl_buffer_free(buf);
  #endif
      ml_close(buf, TRUE);	    // close and delete the memline/memfile
      buf->b_ml.ml_line_count = 0;    // no lines in buffer
      if ((flags & BFA_KEEP_UNDO) == 0)
      {
  	u_blockfree(buf);	    // free the memory allocated for undo
  	u_clearall(buf);	    // reset all undo information
      }
  #ifdef FEAT_SYN_HL
      syntax_clear(&buf->b_s);	    // reset syntax info
  #endif
  #ifdef FEAT_PROP_POPUP
      clear_buf_prop_types(buf);
  #endif
      buf->b_flags &= ~BF_READERR;    // a read error is no longer relevant
  }
  
  /*
   * Free a buffer structure and the things it contains related to the buffer
   * itself (not the file, that must have been done already).
   */
      static void
  free_buffer(buf_T *buf)
  {
      ++buf_free_count;
      free_buffer_stuff(buf, TRUE);
  #ifdef FEAT_EVAL
      // b:changedtick uses an item in buf_T, remove it now
      dictitem_remove(buf->b_vars, (dictitem_T *)&buf->b_ct_di);
      unref_var_dict(buf->b_vars);
      remove_listeners(buf);
  #endif
  #ifdef FEAT_LUA
      lua_buffer_free(buf);
  #endif
  #ifdef FEAT_MZSCHEME
      mzscheme_buffer_free(buf);
  #endif
  #ifdef FEAT_PERL
      perl_buf_free(buf);
  #endif
  #ifdef FEAT_PYTHON
      python_buffer_free(buf);
  #endif
  #ifdef FEAT_PYTHON3
      python3_buffer_free(buf);
  #endif
  #ifdef FEAT_RUBY
      ruby_buffer_free(buf);
  #endif
  #ifdef FEAT_JOB_CHANNEL
      channel_buffer_free(buf);
  #endif
  #ifdef FEAT_TERMINAL
      free_terminal(buf);
  #endif
  #ifdef FEAT_JOB_CHANNEL
      vim_free(buf->b_prompt_text);
      free_callback(&buf->b_prompt_callback);
      free_callback(&buf->b_prompt_interrupt);
  #endif
  
      buf_hashtab_remove(buf);
  
      aubuflocal_remove(buf);
  
      if (autocmd_busy)
      {
  	// Do not free the buffer structure while autocommands are executing,
  	// it's still needed. Free it when autocmd_busy is reset.
  	buf->b_next = au_pending_free_buf;
  	au_pending_free_buf = buf;
      }
      else
      {
  	vim_free(buf);
  	if (curbuf == buf)
  	    curbuf = NULL;  // make clear it's not to be used
      }
  }
  
  /*
   * Initializes b:changedtick.
   */
      static void
  init_changedtick(buf_T *buf)
  {
      dictitem_T *di = (dictitem_T *)&buf->b_ct_di;
  
      di->di_flags = DI_FLAGS_FIX | DI_FLAGS_RO;
      di->di_tv.v_type = VAR_NUMBER;
      di->di_tv.v_lock = VAR_FIXED;
      di->di_tv.vval.v_number = 0;
  
  #ifdef FEAT_EVAL
      STRCPY(buf->b_ct_di.di_key, "changedtick");
      (void)dict_add(buf->b_vars, di);
  #endif
  }
  
  /*
   * Free stuff in the buffer for ":bdel" and when wiping out the buffer.
   */
      static void
  free_buffer_stuff(
      buf_T	*buf,
      int		free_options)		// free options as well
  {
      if (free_options)
      {
  	clear_wininfo(buf);		// including window-local options
  	free_buf_options(buf, TRUE);
  #ifdef FEAT_SPELL
  	ga_clear(&buf->b_s.b_langp);
  #endif
      }
  #ifdef FEAT_EVAL
      {
  	varnumber_T tick = CHANGEDTICK(buf);
  
  	vars_clear(&buf->b_vars->dv_hashtab); // free all buffer variables
  	hash_init(&buf->b_vars->dv_hashtab);
  	init_changedtick(buf);
  	CHANGEDTICK(buf) = tick;
  	remove_listeners(buf);
      }
  #endif
      uc_clear(&buf->b_ucmds);		// clear local user commands
  #ifdef FEAT_SIGNS
      buf_delete_signs(buf, (char_u *)"*");	// delete any signs
  #endif
  #ifdef FEAT_NETBEANS_INTG
      netbeans_file_killed(buf);
  #endif
      map_clear_int(buf, MAP_ALL_MODES, TRUE, FALSE);  // clear local mappings
      map_clear_int(buf, MAP_ALL_MODES, TRUE, TRUE);   // clear local abbrevs
      VIM_CLEAR(buf->b_start_fenc);
  }
  
  /*
   * Free one wininfo_T.
   */
      void
  free_wininfo(wininfo_T *wip)
  {
      if (wip->wi_optset)
      {
  	clear_winopt(&wip->wi_opt);
  #ifdef FEAT_FOLDING
  	deleteFoldRecurse(&wip->wi_folds);
  #endif
      }
      vim_free(wip);
  }
  
  /*
   * Free the b_wininfo list for buffer "buf".
   */
      static void
  clear_wininfo(buf_T *buf)
  {
      wininfo_T	*wip;
  
      while (buf->b_wininfo != NULL)
      {
  	wip = buf->b_wininfo;
  	buf->b_wininfo = wip->wi_next;
  	free_wininfo(wip);
      }
  }
  
  /*
   * Go to another buffer.  Handles the result of the ATTENTION dialog.
   */
      void
  goto_buffer(
      exarg_T	*eap,
      int		start,
      int		dir,
      int		count)
  {
      bufref_T	old_curbuf;
      int		save_sea = swap_exists_action;
  
      set_bufref(&old_curbuf, curbuf);
  
      if (swap_exists_action == SEA_NONE)
  	swap_exists_action = SEA_DIALOG;
      (void)do_buffer(*eap->cmd == 's' ? DOBUF_SPLIT : DOBUF_GOTO,
  					     start, dir, count, eap->forceit);
      if (swap_exists_action == SEA_QUIT && *eap->cmd == 's')
      {
  #if defined(FEAT_EVAL)
  	cleanup_T   cs;
  
  	// Reset the error/interrupt/exception state here so that
  	// aborting() returns FALSE when closing a window.
  	enter_cleanup(&cs);
  #endif
  
  	// Quitting means closing the split window, nothing else.
  	win_close(curwin, TRUE);
  	swap_exists_action = save_sea;
  	swap_exists_did_quit = TRUE;
  
  #if defined(FEAT_EVAL)
  	// Restore the error/interrupt/exception state if not discarded by a
  	// new aborting error, interrupt, or uncaught exception.
  	leave_cleanup(&cs);
  #endif
      }
      else
  	handle_swap_exists(&old_curbuf);
  }
  
  /*
   * Handle the situation of swap_exists_action being set.
   * It is allowed for "old_curbuf" to be NULL or invalid.
   */
      void
  handle_swap_exists(bufref_T *old_curbuf)
  {
  #if defined(FEAT_EVAL)
      cleanup_T	cs;
  #endif
  #ifdef FEAT_SYN_HL
      long	old_tw = curbuf->b_p_tw;
  #endif
      buf_T	*buf;
  
      if (swap_exists_action == SEA_QUIT)
      {
  #if defined(FEAT_EVAL)
  	// Reset the error/interrupt/exception state here so that
  	// aborting() returns FALSE when closing a buffer.
  	enter_cleanup(&cs);
  #endif
  
  	// User selected Quit at ATTENTION prompt.  Go back to previous
  	// buffer.  If that buffer is gone or the same as the current one,
  	// open a new, empty buffer.
  	swap_exists_action = SEA_NONE;	// don't want it again
  	swap_exists_did_quit = TRUE;
  	close_buffer(curwin, curbuf, DOBUF_UNLOAD, FALSE, FALSE);
  	if (old_curbuf == NULL || !bufref_valid(old_curbuf)
  					      || old_curbuf->br_buf == curbuf)
  	{
  	    // Block autocommands here because curwin->w_buffer is NULL.
  	    block_autocmds();
  	    buf = buflist_new(NULL, NULL, 1L, BLN_CURBUF | BLN_LISTED);
  	    unblock_autocmds();
  	}
  	else
  	    buf = old_curbuf->br_buf;
  	if (buf != NULL)
  	{
  	    int old_msg_silent = msg_silent;
  
  	    if (shortmess(SHM_FILEINFO))
  		msg_silent = 1;  // prevent fileinfo message
  	    enter_buffer(buf);
  	    // restore msg_silent, so that the command line will be shown
  	    msg_silent = old_msg_silent;
  
  #ifdef FEAT_SYN_HL
  	    if (old_tw != curbuf->b_p_tw)
  		check_colorcolumn(curwin);
  #endif
  	}
  	// If "old_curbuf" is NULL we are in big trouble here...
  
  #if defined(FEAT_EVAL)
  	// Restore the error/interrupt/exception state if not discarded by a
  	// new aborting error, interrupt, or uncaught exception.
  	leave_cleanup(&cs);
  #endif
      }
      else if (swap_exists_action == SEA_RECOVER)
      {
  #if defined(FEAT_EVAL)
  	// Reset the error/interrupt/exception state here so that
  	// aborting() returns FALSE when closing a buffer.
  	enter_cleanup(&cs);
  #endif
  
  	// User selected Recover at ATTENTION prompt.
  	msg_scroll = TRUE;
  	ml_recover(FALSE);
  	msg_puts("\n");	// don't overwrite the last message
  	cmdline_row = msg_row;
  	do_modelines(0);
  
  #if defined(FEAT_EVAL)
  	// Restore the error/interrupt/exception state if not discarded by a
  	// new aborting error, interrupt, or uncaught exception.
  	leave_cleanup(&cs);
  #endif
      }
      swap_exists_action = SEA_NONE;
  }
  
  /*
   * Make the current buffer empty.
   * Used when it is wiped out and it's the last buffer.
   */
      static int
  empty_curbuf(
      int close_others,
      int forceit,
      int action)
  {
      int	    retval;
      buf_T   *buf = curbuf;
      bufref_T bufref;
  
      if (action == DOBUF_UNLOAD)
      {
  	emsg(_(e_cannot_unload_last_buffer));
  	return FAIL;
      }
  
      set_bufref(&bufref, buf);
      if (close_others)
  	// Close any other windows on this buffer, then make it empty.
  	close_windows(buf, TRUE);
  
      setpcmark();
      retval = do_ecmd(0, NULL, NULL, NULL, ECMD_ONE,
  					  forceit ? ECMD_FORCEIT : 0, curwin);
  
      // do_ecmd() may create a new buffer, then we have to delete
      // the old one.  But do_ecmd() may have done that already, check
      // if the buffer still exists.
      if (buf != curbuf && bufref_valid(&bufref) && buf->b_nwindows == 0)
  	close_buffer(NULL, buf, action, FALSE, FALSE);
      if (!close_others)
  	need_fileinfo = FALSE;
      return retval;
  }
  
  /*
   * Implementation of the commands for the buffer list.
   *
   * action == DOBUF_GOTO	    go to specified buffer
   * action == DOBUF_SPLIT    split window and go to specified buffer
   * action == DOBUF_UNLOAD   unload specified buffer(s)
   * action == DOBUF_DEL	    delete specified buffer(s) from buffer list
   * action == DOBUF_WIPE	    delete specified buffer(s) really
   * action == DOBUF_WIPE_REUSE idem, and add number to "buf_reuse"
   *
   * start == DOBUF_CURRENT   go to "count" buffer from current buffer
   * start == DOBUF_FIRST	    go to "count" buffer from first buffer
   * start == DOBUF_LAST	    go to "count" buffer from last buffer
   * start == DOBUF_MOD	    go to "count" modified buffer from current buffer
   *
   * Return FAIL or OK.
   */
      static int
  do_buffer_ext(
      int		action,
      int		start,
      int		dir,		// FORWARD or BACKWARD
      int		count,		// buffer number or number of buffers
      int		flags)		// DOBUF_FORCEIT etc.
  {
      buf_T	*buf;
      buf_T	*bp;
      int		unload = (action == DOBUF_UNLOAD || action == DOBUF_DEL
  			|| action == DOBUF_WIPE || action == DOBUF_WIPE_REUSE);
  
      switch (start)
      {
  	case DOBUF_FIRST:   buf = firstbuf; break;
  	case DOBUF_LAST:    buf = lastbuf;  break;
  	default:	    buf = curbuf;   break;
      }
      if (start == DOBUF_MOD)	    // find next modified buffer
      {
  	while (count-- > 0)
  	{
  	    do
  	    {
  		buf = buf->b_next;
  		if (buf == NULL)
  		    buf = firstbuf;
  	    }
  	    while (buf != curbuf && !bufIsChanged(buf));
  	}
  	if (!bufIsChanged(buf))
  	{
  	    emsg(_(e_no_modified_buffer_found));
  	    return FAIL;
  	}
      }
      else if (start == DOBUF_FIRST && count) // find specified buffer number
      {
  	while (buf != NULL && buf->b_fnum != count)
  	    buf = buf->b_next;
      }
      else
      {
  	bp = NULL;
  	while (count > 0 || (!unload && !buf->b_p_bl && bp != buf))
  	{
  	    // remember the buffer where we start, we come back there when all
  	    // buffers are unlisted.
  	    if (bp == NULL)
  		bp = buf;
  	    if (dir == FORWARD)
  	    {
  		buf = buf->b_next;
  		if (buf == NULL)
  		    buf = firstbuf;
  	    }
  	    else
  	    {
  		buf = buf->b_prev;
  		if (buf == NULL)
  		    buf = lastbuf;
  	    }
  	    // don't count unlisted buffers
  	    if (unload || buf->b_p_bl)
  	    {
  		 --count;
  		 bp = NULL;	// use this buffer as new starting point
  	    }
  	    if (bp == buf)
  	    {
  		// back where we started, didn't find anything.
  		emsg(_(e_there_is_no_listed_buffer));
  		return FAIL;
  	    }
  	}
      }
  
      if (buf == NULL)	    // could not find it
      {
  	if (start == DOBUF_FIRST)
  	{
  	    // don't warn when deleting
  	    if (!unload)
  		semsg(_(e_buffer_nr_does_not_exist), count);
  	}
  	else if (dir == FORWARD)
  	    emsg(_(e_cannot_go_beyond_last_buffer));
  	else
  	    emsg(_(e_cannot_go_before_first_buffer));
  	return FAIL;
      }
  #ifdef FEAT_PROP_POPUP
      if ((flags & DOBUF_NOPOPUP) && bt_popup(buf)
  # ifdef FEAT_TERMINAL
  				&& !bt_terminal(buf)
  #endif
         )
  	return OK;
  #endif
  
  #ifdef FEAT_GUI
      need_mouse_correct = TRUE;
  #endif
  
      /*
       * delete buffer "buf" from memory and/or the list
       */
      if (unload)
      {
  	int	forward;
  	bufref_T bufref;
  
  	if (!can_unload_buffer(buf))
  	    return FAIL;
  
  	set_bufref(&bufref, buf);
  
  	// When unloading or deleting a buffer that's already unloaded and
  	// unlisted: fail silently.
  	if (action != DOBUF_WIPE && action != DOBUF_WIPE_REUSE
  				   && buf->b_ml.ml_mfp == NULL && !buf->b_p_bl)
  	    return FAIL;
  
  	if ((flags & DOBUF_FORCEIT) == 0 && bufIsChanged(buf))
  	{
  #if defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
  	    if ((p_confirm || (cmdmod.cmod_flags & CMOD_CONFIRM)) && p_write)
  	    {
  		dialog_changed(buf, FALSE);
  		if (!bufref_valid(&bufref))
  		    // Autocommand deleted buffer, oops!  It's not changed
  		    // now.
  		    return FAIL;
  		// If it's still changed fail silently, the dialog already
  		// mentioned why it fails.
  		if (bufIsChanged(buf))
  		    return FAIL;
  	    }
  	    else
  #endif
  	    {
  		semsg(_(e_no_write_since_last_change_for_buffer_nr_add_bang_to_override),
  								 buf->b_fnum);
  		return FAIL;
  	    }
  	}
  
  	// When closing the current buffer stop Visual mode.
  	if (buf == curbuf && VIsual_active)
  	    end_visual_mode();
  
  	// If deleting the last (listed) buffer, make it empty.
  	// The last (listed) buffer cannot be unloaded.
  	FOR_ALL_BUFFERS(bp)
  	    if (bp->b_p_bl && bp != buf)
  		break;
  	if (bp == NULL && buf == curbuf)
  	    return empty_curbuf(TRUE, (flags & DOBUF_FORCEIT), action);
  
  	// If the deleted buffer is the current one, close the current window
  	// (unless it's the only window).  Repeat this so long as we end up in
  	// a window with this buffer.
  	while (buf == curbuf
  		   && !(curwin->w_closing || curwin->w_buffer->b_locked > 0)
  		   && (!ONE_WINDOW || first_tabpage->tp_next != NULL))
  	{
  	    if (win_close(curwin, FALSE) == FAIL)
  		break;
  	}
  
  	// If the buffer to be deleted is not the current one, delete it here.
  	if (buf != curbuf)
  	{
  	    close_windows(buf, FALSE);
  	    if (buf != curbuf && bufref_valid(&bufref) && buf->b_nwindows <= 0)
  		    close_buffer(NULL, buf, action, FALSE, FALSE);
  	    return OK;
  	}
  
  	/*
  	 * Deleting the current buffer: Need to find another buffer to go to.
  	 * There should be another, otherwise it would have been handled
  	 * above.  However, autocommands may have deleted all buffers.
  	 * First use au_new_curbuf.br_buf, if it is valid.
  	 * Then prefer the buffer we most recently visited.
  	 * Else try to find one that is loaded, after the current buffer,
  	 * then before the current buffer.
  	 * Finally use any buffer.
  	 */
  	buf = NULL;	// selected buffer
  	bp = NULL;	// used when no loaded buffer found
  	if (au_new_curbuf.br_buf != NULL && bufref_valid(&au_new_curbuf))
  	    buf = au_new_curbuf.br_buf;
  	else if (curwin->w_jumplistlen > 0)
  	{
  	    int     jumpidx;
  
  	    jumpidx = curwin->w_jumplistidx - 1;
  	    if (jumpidx < 0)
  		jumpidx = curwin->w_jumplistlen - 1;
  
  	    forward = jumpidx;
  	    while (jumpidx != curwin->w_jumplistidx)
  	    {
  		buf = buflist_findnr(curwin->w_jumplist[jumpidx].fmark.fnum);
  		if (buf != NULL)
  		{
  		    // Skip current and unlisted bufs.  Also skip a quickfix
  		    // buffer, it might be deleted soon.
  		    if (buf == curbuf || !buf->b_p_bl
  #if defined(FEAT_QUICKFIX)
  			    || bt_quickfix(buf)
  #endif
  			    )
  			buf = NULL;
  		    else if (buf->b_ml.ml_mfp == NULL)
  		    {
  			// skip unloaded buf, but may keep it for later
  			if (bp == NULL)
  			    bp = buf;
  			buf = NULL;
  		    }
  		}
  		if (buf != NULL)   // found a valid buffer: stop searching
  		    break;
  		// advance to older entry in jump list
  		if (!jumpidx && curwin->w_jumplistidx == curwin->w_jumplistlen)
  		    break;
  		if (--jumpidx < 0)
  		    jumpidx = curwin->w_jumplistlen - 1;
  		if (jumpidx == forward)		// List exhausted for sure
  		    break;
  	    }
  	}
  
  	if (buf == NULL)	// No previous buffer, Try 2'nd approach
  	{
  	    forward = TRUE;
  	    buf = curbuf->b_next;
  	    for (;;)
  	    {
  		if (buf == NULL)
  		{
  		    if (!forward)	// tried both directions
  			break;
  		    buf = curbuf->b_prev;
  		    forward = FALSE;
  		    continue;
  		}
  		// in non-help buffer, try to skip help buffers, and vv
  		if (buf->b_help == curbuf->b_help && buf->b_p_bl
  #if defined(FEAT_QUICKFIX)
  			    && !bt_quickfix(buf)
  #endif
  			   )
  		{
  		    if (buf->b_ml.ml_mfp != NULL)   // found loaded buffer
  			break;
  		    if (bp == NULL)	// remember unloaded buf for later
  			bp = buf;
  		}
  		if (forward)
  		    buf = buf->b_next;
  		else
  		    buf = buf->b_prev;
  	    }
  	}
  	if (buf == NULL)	// No loaded buffer, use unloaded one
  	    buf = bp;
  	if (buf == NULL)	// No loaded buffer, find listed one
  	{
  	    FOR_ALL_BUFFERS(buf)
  		if (buf->b_p_bl && buf != curbuf
  #if defined(FEAT_QUICKFIX)
  			    && !bt_quickfix(buf)
  #endif
  		       )
  		    break;
  	}
  	if (buf == NULL)	// Still no buffer, just take one
  	{
  	    if (curbuf->b_next != NULL)
  		buf = curbuf->b_next;
  	    else
  		buf = curbuf->b_prev;
  #if defined(FEAT_QUICKFIX)
  	    if (bt_quickfix(buf))
  		buf = NULL;
  #endif
  	}
      }
  
      if (buf == NULL)
      {
  	// Autocommands must have wiped out all other buffers.  Only option
  	// now is to make the current buffer empty.
  	return empty_curbuf(FALSE, (flags & DOBUF_FORCEIT), action);
      }
  
      /*
       * make "buf" the current buffer
       */
      if (action == DOBUF_SPLIT)	    // split window first
      {
  	// If 'switchbuf' contains "useopen": jump to first window containing
  	// "buf" if one exists
  	if ((swb_flags & SWB_USEOPEN) && buf_jump_open_win(buf))
  	    return OK;
  	// If 'switchbuf' contains "usetab": jump to first window in any tab
  	// page containing "buf" if one exists
  	if ((swb_flags & SWB_USETAB) && buf_jump_open_tab(buf))
  	    return OK;
  	if (win_split(0, 0) == FAIL)
  	    return FAIL;
      }
  
      // go to current buffer - nothing to do
      if (buf == curbuf)
  	return OK;
  
      // Check if the current buffer may be abandoned.
      if (action == DOBUF_GOTO && !can_abandon(curbuf, (flags & DOBUF_FORCEIT)))
      {
  #if defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
  	if ((p_confirm || (cmdmod.cmod_flags & CMOD_CONFIRM)) && p_write)
  	{
  	    bufref_T bufref;
  
  	    set_bufref(&bufref, buf);
  	    dialog_changed(curbuf, FALSE);
  	    if (!bufref_valid(&bufref))
  		// Autocommand deleted buffer, oops!
  		return FAIL;
  	}
  	if (bufIsChanged(curbuf))
  #endif
  	{
  	    no_write_message();
  	    return FAIL;
  	}
      }
  
      // Go to the other buffer.
      set_curbuf(buf, action);
  
      if (action == DOBUF_SPLIT)
  	RESET_BINDING(curwin);	// reset 'scrollbind' and 'cursorbind'
  
  #if defined(FEAT_EVAL)
      if (aborting())	    // autocmds may abort script processing
  	return FAIL;
  #endif
  
      return OK;
  }
  
      int
  do_buffer(
      int		action,
      int		start,
      int		dir,		// FORWARD or BACKWARD
      int		count,		// buffer number or number of buffers
      int		forceit)	// TRUE when using !
  {
      return do_buffer_ext(action, start, dir, count,
  						  forceit ? DOBUF_FORCEIT : 0);
  }
  
  /*
   * do_bufdel() - delete or unload buffer(s)
   *
   * addr_count == 0: ":bdel" - delete current buffer
   * addr_count == 1: ":N bdel" or ":bdel N [N ..]" - first delete
   *		    buffer "end_bnr", then any other arguments.
   * addr_count == 2: ":N,N bdel" - delete buffers in range
   *
   * command can be DOBUF_UNLOAD (":bunload"), DOBUF_WIPE (":bwipeout") or
   * DOBUF_DEL (":bdel")
   *
   * Returns error message or NULL
   */
      char *
  do_bufdel(
      int		command,
      char_u	*arg,		// pointer to extra arguments
      int		addr_count,
      int		start_bnr,	// first buffer number in a range
      int		end_bnr,	// buffer nr or last buffer nr in a range
      int		forceit)
  {
      int		do_current = 0;	// delete current buffer?
      int		deleted = 0;	// number of buffers deleted
      char	*errormsg = NULL; // return value
      int		bnr;		// buffer number
      char_u	*p;
  
      if (addr_count == 0)
      {
  	(void)do_buffer(command, DOBUF_CURRENT, FORWARD, 0, forceit);
      }
      else
      {
  	if (addr_count == 2)
  	{
  	    if (*arg)		// both range and argument is not allowed
  		return ex_errmsg(e_trailing_characters_str, arg);
  	    bnr = start_bnr;
  	}
  	else	// addr_count == 1
  	    bnr = end_bnr;
  
  	for ( ;!got_int; ui_breakcheck())
  	{
  	    // Delete the current buffer last, otherwise when the
  	    // current buffer is deleted, the next buffer becomes
  	    // the current one and will be loaded, which may then
  	    // also be deleted, etc.
  	    if (bnr == curbuf->b_fnum)
  		do_current = bnr;
  	    else if (do_buffer_ext(command, DOBUF_FIRST, FORWARD, bnr,
  			  DOBUF_NOPOPUP | (forceit ? DOBUF_FORCEIT : 0)) == OK)
  		++deleted;
  
  	    // find next buffer number to delete/unload
  	    if (addr_count == 2)
  	    {
  		if (++bnr > end_bnr)
  		    break;
  	    }
  	    else    // addr_count == 1
  	    {
  		arg = skipwhite(arg);
  		if (*arg == NUL)
  		    break;
  		if (!VIM_ISDIGIT(*arg))
  		{
  		    p = skiptowhite_esc(arg);
  		    bnr = buflist_findpat(arg, p,
  			  command == DOBUF_WIPE || command == DOBUF_WIPE_REUSE,
  								FALSE, FALSE);
  		    if (bnr < 0)	    // failed
  			break;
  		    arg = p;
  		}
  		else
  		    bnr = getdigits(&arg);
  	    }
  	}
  	if (!got_int && do_current && do_buffer(command, DOBUF_FIRST,
  					  FORWARD, do_current, forceit) == OK)
  	    ++deleted;
  
  	if (deleted == 0)
  	{
  	    if (command == DOBUF_UNLOAD)
  		STRCPY(IObuff, _(e_no_buffers_were_unloaded));
  	    else if (command == DOBUF_DEL)
  		STRCPY(IObuff, _(e_no_buffers_were_deleted));
  	    else
  		STRCPY(IObuff, _(e_no_buffers_were_wiped_out));
  	    errormsg = (char *)IObuff;
  	}
  	else if (deleted >= p_report)
  	{
  	    if (command == DOBUF_UNLOAD)
  		smsg(NGETTEXT("%d buffer unloaded",
  			    "%d buffers unloaded", deleted), deleted);
  	    else if (command == DOBUF_DEL)
  		smsg(NGETTEXT("%d buffer deleted",
  			    "%d buffers deleted", deleted), deleted);
  	    else
  		smsg(NGETTEXT("%d buffer wiped out",
  			    "%d buffers wiped out", deleted), deleted);
  	}
      }
  
  
      return errormsg;
  }
  
  /*
   * Set current buffer to "buf".  Executes autocommands and closes current
   * buffer.  "action" tells how to close the current buffer:
   * DOBUF_GOTO	    free or hide it
   * DOBUF_SPLIT	    nothing
   * DOBUF_UNLOAD	    unload it
   * DOBUF_DEL	    delete it
   * DOBUF_WIPE	    wipe it out
   * DOBUF_WIPE_REUSE wipe it out and add to "buf_reuse"
   */
      void
  set_curbuf(buf_T *buf, int action)
  {
      buf_T	*prevbuf;
      int		unload = (action == DOBUF_UNLOAD || action == DOBUF_DEL
  			|| action == DOBUF_WIPE || action == DOBUF_WIPE_REUSE);
  #ifdef FEAT_SYN_HL
      long	old_tw = curbuf->b_p_tw;
  #endif
      bufref_T	newbufref;
      bufref_T	prevbufref;
      int		valid;
  
      setpcmark();
      if ((cmdmod.cmod_flags & CMOD_KEEPALT) == 0)
  	curwin->w_alt_fnum = curbuf->b_fnum; // remember alternate file
      buflist_altfpos(curwin);			 // remember curpos
  
      // Don't restart Select mode after switching to another buffer.
      VIsual_reselect = FALSE;
  
      // close_windows() or apply_autocmds() may change curbuf and wipe out "buf"
      prevbuf = curbuf;
      set_bufref(&prevbufref, prevbuf);
      set_bufref(&newbufref, buf);
  
      // Autocommands may delete the current buffer and/or the buffer we want to
      // go to.  In those cases don't close the buffer.
      if (!apply_autocmds(EVENT_BUFLEAVE, NULL, NULL, FALSE, curbuf)
  	    || (bufref_valid(&prevbufref)
  		&& bufref_valid(&newbufref)
  #ifdef FEAT_EVAL
  		&& !aborting()
  #endif
  	       ))
      {
  #ifdef FEAT_SYN_HL
  	if (prevbuf == curwin->w_buffer)
  	    reset_synblock(curwin);
  #endif
  	if (unload)
  	    close_windows(prevbuf, FALSE);
  #if defined(FEAT_EVAL)
  	if (bufref_valid(&prevbufref) && !aborting())
  #else
  	if (bufref_valid(&prevbufref))
  #endif
  	{
  	    win_T  *previouswin = curwin;
  
  	    // Do not sync when in Insert mode and the buffer is open in
  	    // another window, might be a timer doing something in another
  	    // window.
  	    if (prevbuf == curbuf
  		    && ((State & MODE_INSERT) == 0 || curbuf->b_nwindows <= 1))
  		u_sync(FALSE);
  	    close_buffer(prevbuf == curwin->w_buffer ? curwin : NULL, prevbuf,
  		    unload ? action : (action == DOBUF_GOTO
  			&& !buf_hide(prevbuf)
  			&& !bufIsChanged(prevbuf)) ? DOBUF_UNLOAD : 0,
  		    FALSE, FALSE);
  	    if (curwin != previouswin && win_valid(previouswin))
  	      // autocommands changed curwin, Grr!
  	      curwin = previouswin;
  	}
      }
      // An autocommand may have deleted "buf", already entered it (e.g., when
      // it did ":bunload") or aborted the script processing.
      // If curwin->w_buffer is null, enter_buffer() will make it valid again
      valid = buf_valid(buf);
      if ((valid && buf != curbuf
  #ifdef FEAT_EVAL
  		&& !aborting()
  #endif
  	) || curwin->w_buffer == NULL)
      {
  	// If the buffer is not valid but curwin->w_buffer is NULL we must
  	// enter some buffer.  Using the last one is hopefully OK.
  	if (!valid)
  	    enter_buffer(lastbuf);
  	else
  	    enter_buffer(buf);
  #ifdef FEAT_SYN_HL
  	if (old_tw != curbuf->b_p_tw)
  	    check_colorcolumn(curwin);
  #endif
      }
  }
  
  /*
   * Enter a new current buffer.
   * Old curbuf must have been abandoned already!  This also means "curbuf" may
   * be pointing to freed memory.
   */
      static void
  enter_buffer(buf_T *buf)
  {
      // Get the buffer in the current window.
      curwin->w_buffer = buf;
      curbuf = buf;
      ++curbuf->b_nwindows;
  
      // Copy buffer and window local option values.  Not for a help buffer.
      buf_copy_options(buf, BCO_ENTER | BCO_NOHELP);
      if (!buf->b_help)
  	get_winopts(buf);
  #ifdef FEAT_FOLDING
      else
  	// Remove all folds in the window.
  	clearFolding(curwin);
      foldUpdateAll(curwin);	// update folds (later).
  #endif
  
  #ifdef FEAT_DIFF
      if (curwin->w_p_diff)
  	diff_buf_add(curbuf);
  #endif
  
  #ifdef FEAT_SYN_HL
      curwin->w_s = &(curbuf->b_s);
  #endif
  
      // Cursor on first line by default.
      curwin->w_cursor.lnum = 1;
      curwin->w_cursor.col = 0;
      curwin->w_cursor.coladd = 0;
      curwin->w_set_curswant = TRUE;
      curwin->w_topline_was_set = FALSE;
  
      // mark cursor position as being invalid
      curwin->w_valid = 0;
  
      buflist_setfpos(curbuf, curwin, curbuf->b_last_cursor.lnum,
  					      curbuf->b_last_cursor.col, TRUE);
  
      // Make sure the buffer is loaded.
      if (curbuf->b_ml.ml_mfp == NULL)	// need to load the file
      {
  	// If there is no filetype, allow for detecting one.  Esp. useful for
  	// ":ball" used in an autocommand.  If there already is a filetype we
  	// might prefer to keep it.
  	if (*curbuf->b_p_ft == NUL)
  	    did_filetype = FALSE;
  
  	open_buffer(FALSE, NULL, 0);
      }
      else
      {
  	if (!msg_silent && !shortmess(SHM_FILEINFO))
  	    need_fileinfo = TRUE;	// display file info after redraw
  
  	// check if file changed
  	(void)buf_check_timestamp(curbuf, FALSE);
  
  	curwin->w_topline = 1;
  #ifdef FEAT_DIFF
  	curwin->w_topfill = 0;
  #endif
  	apply_autocmds(EVENT_BUFENTER, NULL, NULL, FALSE, curbuf);
  	apply_autocmds(EVENT_BUFWINENTER, NULL, NULL, FALSE, curbuf);
      }
  
      // If autocommands did not change the cursor position, restore cursor lnum
      // and possibly cursor col.
      if (curwin->w_cursor.lnum == 1 && inindent(0))
  	buflist_getfpos();
  
      check_arg_idx(curwin);		// check for valid arg_idx
      maketitle();
  	// when autocmds didn't change it
      if (curwin->w_topline == 1 && !curwin->w_topline_was_set)
  	scroll_cursor_halfway(FALSE);	// redisplay at correct position
  
  #ifdef FEAT_NETBEANS_INTG
      // Send fileOpened event because we've changed buffers.
      netbeans_file_activated(curbuf);
  #endif
  
      // Change directories when the 'acd' option is set.
      DO_AUTOCHDIR;
  
  #ifdef FEAT_KEYMAP
      if (curbuf->b_kmap_state & KEYMAP_INIT)
  	(void)keymap_init();
  #endif
  #ifdef FEAT_SPELL
      // May need to set the spell language.  Can only do this after the buffer
      // has been properly setup.
      if (!curbuf->b_help && curwin->w_p_spell && *curwin->w_s->b_p_spl != NUL)
  	(void)did_set_spelllang(curwin);
  #endif
  #ifdef FEAT_VIMINFO
      curbuf->b_last_used = vim_time();
  #endif
  
      redraw_later(NOT_VALID);
  }
  
  #if defined(FEAT_AUTOCHDIR) || defined(PROTO)
  /*
   * Change to the directory of the current buffer.
   * Don't do this while still starting up.
   */
      void
  do_autochdir(void)
  {
      if ((starting == 0 || test_autochdir)
  	    && curbuf->b_ffname != NULL
  	    && vim_chdirfile(curbuf->b_ffname, "auto") == OK)
      {
  	shorten_fnames(TRUE);
  	last_chdir_reason = "autochdir";
      }
  }
  #endif
  
      void
  no_write_message(void)
  {
  #ifdef FEAT_TERMINAL
      if (term_job_running(curbuf->b_term))
  	emsg(_(e_job_still_running_add_bang_to_end_the_job));
      else
  #endif
  	emsg(_(e_no_write_since_last_change_add_bang_to_override));
  }
  
      void
  no_write_message_nobang(buf_T *buf UNUSED)
  {
  #ifdef FEAT_TERMINAL
      if (term_job_running(buf->b_term))
  	emsg(_(e_job_still_running));
      else
  #endif
  	emsg(_(e_no_write_since_last_change));
  }
  
  /*
   * functions for dealing with the buffer list
   */
  
  /*
   * Return TRUE if the current buffer is empty, unnamed, unmodified and used in
   * only one window.  That means it can be re-used.
   */
      int
  curbuf_reusable(void)
  {
      return (curbuf != NULL
  	&& curbuf->b_ffname == NULL
  	&& curbuf->b_nwindows <= 1
  	&& (curbuf->b_ml.ml_mfp == NULL || BUFEMPTY())
  #if defined(FEAT_QUICKFIX)
  	&& !bt_quickfix(curbuf)
  #endif
  	&& !curbufIsChanged());
  }
  
  /*
   * Add a file name to the buffer list.  Return a pointer to the buffer.
   * If the same file name already exists return a pointer to that buffer.
   * If it does not exist, or if fname == NULL, a new entry is created.
   * If (flags & BLN_CURBUF) is TRUE, may use current buffer.
   * If (flags & BLN_LISTED) is TRUE, add new buffer to buffer list.
   * If (flags & BLN_DUMMY) is TRUE, don't count it as a real buffer.
   * If (flags & BLN_NEW) is TRUE, don't use an existing buffer.
   * If (flags & BLN_NOOPT) is TRUE, don't copy options from the current buffer
   *				    if the buffer already exists.
   * If (flags & BLN_REUSE) is TRUE, may use buffer number from "buf_reuse".
   * This is the ONLY way to create a new buffer.
   */
      buf_T *
  buflist_new(
      char_u	*ffname_arg,	// full path of fname or relative
      char_u	*sfname_arg,	// short fname or NULL
      linenr_T	lnum,		// preferred cursor line
      int		flags)		// BLN_ defines
  {
      char_u	*ffname = ffname_arg;
      char_u	*sfname = sfname_arg;
      buf_T	*buf;
  #ifdef UNIX
      stat_T	st;
  #endif
  
      if (top_file_num == 1)
  	hash_init(&buf_hashtab);
  
      fname_expand(curbuf, &ffname, &sfname);	// will allocate ffname
  
      /*
       * If the file name already exists in the list, update the entry.
       */
  #ifdef UNIX
      // On Unix we can use inode numbers when the file exists.  Works better
      // for hard links.
      if (sfname == NULL || mch_stat((char *)sfname, &st) < 0)
  	st.st_dev = (dev_T)-1;
  #endif
      if (ffname != NULL && !(flags & (BLN_DUMMY | BLN_NEW)) && (buf =
  #ifdef UNIX
  		buflist_findname_stat(ffname, &st)
  #else
  		buflist_findname(ffname)
  #endif
  		) != NULL)
      {
  	vim_free(ffname);
  	if (lnum != 0)
  	    buflist_setfpos(buf, (flags & BLN_NOCURWIN) ? NULL : curwin,
  						      lnum, (colnr_T)0, FALSE);
  
  	if ((flags & BLN_NOOPT) == 0)
  	    // copy the options now, if 'cpo' doesn't have 's' and not done
  	    // already
  	    buf_copy_options(buf, 0);
  
  	if ((flags & BLN_LISTED) && !buf->b_p_bl)
  	{
  	    bufref_T bufref;
  
  	    buf->b_p_bl = TRUE;
  	    set_bufref(&bufref, buf);
  	    if (!(flags & BLN_DUMMY))
  	    {
  		if (apply_autocmds(EVENT_BUFADD, NULL, NULL, FALSE, buf)
  			&& !bufref_valid(&bufref))
  		    return NULL;
  	    }
  	}
  	return buf;
      }
  
      /*
       * If the current buffer has no name and no contents, use the current
       * buffer.	Otherwise: Need to allocate a new buffer structure.
       *
       * This is the ONLY place where a new buffer structure is allocated!
       * (A spell file buffer is allocated in spell.c, but that's not a normal
       * buffer.)
       */
      buf = NULL;
      if ((flags & BLN_CURBUF) && curbuf_reusable())
      {
  	buf = curbuf;
  	// It's like this buffer is deleted.  Watch out for autocommands that
  	// change curbuf!  If that happens, allocate a new buffer anyway.
  	buf_freeall(buf, BFA_WIPE | BFA_DEL);
  	if (buf != curbuf)   // autocommands deleted the buffer!
  	    return NULL;
  #ifdef FEAT_EVAL
  	if (aborting())		// autocmds may abort script processing
  	{
  	    vim_free(ffname);
  	    return NULL;
  	}
  #endif
      }
      if (buf != curbuf || curbuf == NULL)
      {
  	buf = ALLOC_CLEAR_ONE(buf_T);
  	if (buf == NULL)
  	{
  	    vim_free(ffname);
  	    return NULL;
  	}
  #ifdef FEAT_EVAL
  	// init b: variables
  	buf->b_vars = dict_alloc_id(aid_newbuf_bvars);
  	if (buf->b_vars == NULL)
  	{
  	    vim_free(ffname);
  	    vim_free(buf);
  	    return NULL;
  	}
  	init_var_dict(buf->b_vars, &buf->b_bufvar, VAR_SCOPE);
  #endif
  	init_changedtick(buf);
      }
  
      if (ffname != NULL)
      {
  	buf->b_ffname = ffname;
  	buf->b_sfname = vim_strsave(sfname);
      }
  
      clear_wininfo(buf);
      buf->b_wininfo = ALLOC_CLEAR_ONE(wininfo_T);
  
      if ((ffname != NULL && (buf->b_ffname == NULL || buf->b_sfname == NULL))
  	    || buf->b_wininfo == NULL)
      {
  	if (buf->b_sfname != buf->b_ffname)
  	    VIM_CLEAR(buf->b_sfname);
  	else
  	    buf->b_sfname = NULL;
  	VIM_CLEAR(buf->b_ffname);
  	if (buf != curbuf)
  	    free_buffer(buf);
  	return NULL;
      }
  
      if (buf == curbuf)
      {
  	free_buffer_stuff(buf, FALSE);	// delete local variables et al.
  
  	// Init the options.
  	buf->b_p_initialized = FALSE;
  	buf_copy_options(buf, BCO_ENTER);
  
  #ifdef FEAT_KEYMAP
  	// need to reload lmaps and set b:keymap_name
  	curbuf->b_kmap_state |= KEYMAP_INIT;
  #endif
      }
      else
      {
  	// put the new buffer at the end of the buffer list
  	buf->b_next = NULL;
  	if (firstbuf == NULL)		// buffer list is empty
  	{
  	    buf->b_prev = NULL;
  	    firstbuf = buf;
  	}
  	else				// append new buffer at end of list
  	{
  	    lastbuf->b_next = buf;
  	    buf->b_prev = lastbuf;
  	}
  	lastbuf = buf;
  
  	if ((flags & BLN_REUSE) && buf_reuse.ga_len > 0)
  	{
  	    // Recycle a previously used buffer number.  Used for buffers which
  	    // are normally hidden, e.g. in a popup window.  Avoids that the
  	    // buffer number grows rapidly.
  	    --buf_reuse.ga_len;
  	    buf->b_fnum = ((int *)buf_reuse.ga_data)[buf_reuse.ga_len];
  
  	    // Move buffer to the right place in the buffer list.
  	    while (buf->b_prev != NULL && buf->b_fnum < buf->b_prev->b_fnum)
  	    {
  		buf_T	*prev = buf->b_prev;
  
  		prev->b_next = buf->b_next;
  		if (prev->b_next != NULL)
  		    prev->b_next->b_prev = prev;
  		buf->b_next = prev;
  		buf->b_prev = prev->b_prev;
  		if (buf->b_prev != NULL)
  		    buf->b_prev->b_next = buf;
  		prev->b_prev = buf;
  		if (lastbuf == buf)
  		    lastbuf = prev;
  		if (firstbuf == prev)
  		    firstbuf = buf;
  	    }
  	}
  	else
  	    buf->b_fnum = top_file_num++;
  	if (top_file_num < 0)		// wrap around (may cause duplicates)
  	{
  	    emsg(_("W14: Warning: List of file names overflow"));
  	    if (emsg_silent == 0 && !in_assert_fails)
  	    {
  		out_flush();
  		ui_delay(3001L, TRUE);	// make sure it is noticed
  	    }
  	    top_file_num = 1;
  	}
  	buf_hashtab_add(buf);
  
  	// Always copy the options from the current buffer.
  	buf_copy_options(buf, BCO_ALWAYS);
      }
  
      buf->b_wininfo->wi_fpos.lnum = lnum;
      buf->b_wininfo->wi_win = curwin;
  
  #ifdef FEAT_SYN_HL
      hash_init(&buf->b_s.b_keywtab);
      hash_init(&buf->b_s.b_keywtab_ic);
  #endif
  
      buf->b_fname = buf->b_sfname;
  #ifdef UNIX
      if (st.st_dev == (dev_T)-1)
  	buf->b_dev_valid = FALSE;
      else
      {
  	buf->b_dev_valid = TRUE;
  	buf->b_dev = st.st_dev;
  	buf->b_ino = st.st_ino;
      }
  #endif
      buf->b_u_synced = TRUE;
      buf->b_flags = BF_CHECK_RO | BF_NEVERLOADED;
      if (flags & BLN_DUMMY)
  	buf->b_flags |= BF_DUMMY;
      buf_clear_file(buf);
      clrallmarks(buf);			// clear marks
      fmarks_check_names(buf);		// check file marks for this file
      buf->b_p_bl = (flags & BLN_LISTED) ? TRUE : FALSE;	// init 'buflisted'
      if (!(flags & BLN_DUMMY))
      {
  	bufref_T bufref;
  
  	// Tricky: these autocommands may change the buffer list.  They could
  	// also split the window with re-using the one empty buffer. This may
  	// result in unexpectedly losing the empty buffer.
  	set_bufref(&bufref, buf);
  	if (apply_autocmds(EVENT_BUFNEW, NULL, NULL, FALSE, buf)
  		&& !bufref_valid(&bufref))
  	    return NULL;
  	if (flags & BLN_LISTED)
  	{
  	    if (apply_autocmds(EVENT_BUFADD, NULL, NULL, FALSE, buf)
  		    && !bufref_valid(&bufref))
  		return NULL;
  	}
  #ifdef FEAT_EVAL
  	if (aborting())		// autocmds may abort script processing
  	    return NULL;
  #endif
      }
  
      return buf;
  }
  
  /*
   * Free the memory for the options of a buffer.
   * If "free_p_ff" is TRUE also free 'fileformat', 'buftype' and
   * 'fileencoding'.
   */
      void
  free_buf_options(
      buf_T	*buf,
      int		free_p_ff)
  {
      if (free_p_ff)
      {
  	clear_string_option(&buf->b_p_fenc);
  	clear_string_option(&buf->b_p_ff);
  	clear_string_option(&buf->b_p_bh);
  	clear_string_option(&buf->b_p_bt);
      }
  #ifdef FEAT_FIND_ID
      clear_string_option(&buf->b_p_def);
      clear_string_option(&buf->b_p_inc);
  # ifdef FEAT_EVAL
      clear_string_option(&buf->b_p_inex);
  # endif
  #endif
  #if defined(FEAT_CINDENT) && defined(FEAT_EVAL)
      clear_string_option(&buf->b_p_inde);
      clear_string_option(&buf->b_p_indk);
  #endif
  #if defined(FEAT_BEVAL) && defined(FEAT_EVAL)
      clear_string_option(&buf->b_p_bexpr);
  #endif
  #if defined(FEAT_CRYPT)
      clear_string_option(&buf->b_p_cm);
  #endif
      clear_string_option(&buf->b_p_fp);
  #if defined(FEAT_EVAL)
      clear_string_option(&buf->b_p_fex);
  #endif
  #ifdef FEAT_CRYPT
  # ifdef FEAT_SODIUM
      if ((buf->b_p_key != NULL) && (*buf->b_p_key != NUL) &&
  				(crypt_get_method_nr(buf) == CRYPT_M_SOD))
  	crypt_sodium_munlock(buf->b_p_key, STRLEN(buf->b_p_key));
  # endif
      clear_string_option(&buf->b_p_key);
  #endif
      clear_string_option(&buf->b_p_kp);
      clear_string_option(&buf->b_p_mps);
      clear_string_option(&buf->b_p_fo);
      clear_string_option(&buf->b_p_flp);
      clear_string_option(&buf->b_p_isk);
  #ifdef FEAT_VARTABS
      clear_string_option(&buf->b_p_vsts);
      vim_free(buf->b_p_vsts_nopaste);
      buf->b_p_vsts_nopaste = NULL;
      VIM_CLEAR(buf->b_p_vsts_array);
      clear_string_option(&buf->b_p_vts);
      VIM_CLEAR(buf->b_p_vts_array);
  #endif
  #ifdef FEAT_KEYMAP
      clear_string_option(&buf->b_p_keymap);
      keymap_clear(&buf->b_kmap_ga);
      ga_clear(&buf->b_kmap_ga);
  #endif
      clear_string_option(&buf->b_p_com);
  #ifdef FEAT_FOLDING
      clear_string_option(&buf->b_p_cms);
  #endif
      clear_string_option(&buf->b_p_nf);
  #ifdef FEAT_SYN_HL
      clear_string_option(&buf->b_p_syn);
      clear_string_option(&buf->b_s.b_syn_isk);
  #endif
  #ifdef FEAT_SPELL
      clear_string_option(&buf->b_s.b_p_spc);
      clear_string_option(&buf->b_s.b_p_spf);
      vim_regfree(buf->b_s.b_cap_prog);
      buf->b_s.b_cap_prog = NULL;
      clear_string_option(&buf->b_s.b_p_spl);
      clear_string_option(&buf->b_s.b_p_spo);
  #endif
  #ifdef FEAT_SEARCHPATH
      clear_string_option(&buf->b_p_sua);
  #endif
      clear_string_option(&buf->b_p_ft);
  #ifdef FEAT_CINDENT
      clear_string_option(&buf->b_p_cink);
      clear_string_option(&buf->b_p_cino);
      clear_string_option(&buf->b_p_cinsd);
  #endif
  #if defined(FEAT_CINDENT) || defined(FEAT_SMARTINDENT)
      clear_string_option(&buf->b_p_cinw);
  #endif
      clear_string_option(&buf->b_p_cpt);
  #ifdef FEAT_COMPL_FUNC
      clear_string_option(&buf->b_p_cfu);
      free_callback(&buf->b_cfu_cb);
      clear_string_option(&buf->b_p_ofu);
      free_callback(&buf->b_ofu_cb);
      clear_string_option(&buf->b_p_tsrfu);
      free_callback(&buf->b_tsrfu_cb);
  #endif
  #ifdef FEAT_QUICKFIX
      clear_string_option(&buf->b_p_gp);
      clear_string_option(&buf->b_p_mp);
      clear_string_option(&buf->b_p_efm);
  #endif
      clear_string_option(&buf->b_p_ep);
      clear_string_option(&buf->b_p_path);
      clear_string_option(&buf->b_p_tags);
      clear_string_option(&buf->b_p_tc);
  #ifdef FEAT_EVAL
      clear_string_option(&buf->b_p_tfu);
      free_callback(&buf->b_tfu_cb);
  #endif
      clear_string_option(&buf->b_p_dict);
      clear_string_option(&buf->b_p_tsr);
  #ifdef FEAT_TEXTOBJ
      clear_string_option(&buf->b_p_qe);
  #endif
      buf->b_p_ar = -1;
      buf->b_p_ul = NO_LOCAL_UNDOLEVEL;
  #ifdef FEAT_LISP
      clear_string_option(&buf->b_p_lw);
  #endif
      clear_string_option(&buf->b_p_bkc);
      clear_string_option(&buf->b_p_menc);
  }
  
  /*
   * Get alternate file "n".
   * Set linenr to "lnum" or altfpos.lnum if "lnum" == 0.
   *	Also set cursor column to altfpos.col if 'startofline' is not set.
   * if (options & GETF_SETMARK) call setpcmark()
   * if (options & GETF_ALT) we are jumping to an alternate file.
   * if (options & GETF_SWITCH) respect 'switchbuf' settings when jumping
   *
   * Return FAIL for failure, OK for success.
   */
      int
  buflist_getfile(
      int		n,
      linenr_T	lnum,
      int		options,
      int		forceit)
  {
      buf_T	*buf;
      win_T	*wp = NULL;
      pos_T	*fpos;
      colnr_T	col;
  
      buf = buflist_findnr(n);
      if (buf == NULL)
      {
  	if ((options & GETF_ALT) && n == 0)
  	    emsg(_(e_no_alternate_file));
  	else
  	    semsg(_(e_buffer_nr_not_found), n);
  	return FAIL;
      }
  
      // if alternate file is the current buffer, nothing to do
      if (buf == curbuf)
  	return OK;
  
      if (text_locked())
      {
  	text_locked_msg();
  	return FAIL;
      }
      if (curbuf_locked())
  	return FAIL;
  
      // altfpos may be changed by getfile(), get it now
      if (lnum == 0)
      {
  	fpos = buflist_findfpos(buf);
  	lnum = fpos->lnum;
  	col = fpos->col;
      }
      else
  	col = 0;
  
      if (options & GETF_SWITCH)
      {
  	// If 'switchbuf' contains "useopen": jump to first window containing
  	// "buf" if one exists
  	if (swb_flags & SWB_USEOPEN)
  	    wp = buf_jump_open_win(buf);
  
  	// If 'switchbuf' contains "usetab": jump to first window in any tab
  	// page containing "buf" if one exists
  	if (wp == NULL && (swb_flags & SWB_USETAB))
  	    wp = buf_jump_open_tab(buf);
  
  	// If 'switchbuf' contains "split", "vsplit" or "newtab" and the
  	// current buffer isn't empty: open new tab or window
  	if (wp == NULL && (swb_flags & (SWB_VSPLIT | SWB_SPLIT | SWB_NEWTAB))
  							       && !BUFEMPTY())
  	{
  	    if (swb_flags & SWB_NEWTAB)
  		tabpage_new();
  	    else if (win_split(0, (swb_flags & SWB_VSPLIT) ? WSP_VERT : 0)
  								      == FAIL)
  		return FAIL;
  	    RESET_BINDING(curwin);
  	}
      }
  
      ++RedrawingDisabled;
      if (GETFILE_SUCCESS(getfile(buf->b_fnum, NULL, NULL,
  				     (options & GETF_SETMARK), lnum, forceit)))
      {
  	--RedrawingDisabled;
  
  	// cursor is at to BOL and w_cursor.lnum is checked due to getfile()
  	if (!p_sol && col != 0)
  	{
  	    curwin->w_cursor.col = col;
  	    check_cursor_col();
  	    curwin->w_cursor.coladd = 0;
  	    curwin->w_set_curswant = TRUE;
  	}
  	return OK;
      }
      --RedrawingDisabled;
      return FAIL;
  }
  
  /*
   * go to the last know line number for the current buffer
   */
      static void
  buflist_getfpos(void)
  {
      pos_T	*fpos;
  
      fpos = buflist_findfpos(curbuf);
  
      curwin->w_cursor.lnum = fpos->lnum;
      check_cursor_lnum();
  
      if (p_sol)
  	curwin->w_cursor.col = 0;
      else
      {
  	curwin->w_cursor.col = fpos->col;
  	check_cursor_col();
  	curwin->w_cursor.coladd = 0;
  	curwin->w_set_curswant = TRUE;
      }
  }
  
  #if defined(FEAT_QUICKFIX) || defined(FEAT_EVAL) || defined(PROTO)
  /*
   * Find file in buffer list by name (it has to be for the current window).
   * Returns NULL if not found.
   */
      buf_T *
  buflist_findname_exp(char_u *fname)
  {
      char_u	*ffname;
      buf_T	*buf = NULL;
  
      // First make the name into a full path name
      ffname = FullName_save(fname,
  #ifdef UNIX
  	    TRUE	    // force expansion, get rid of symbolic links
  #else
  	    FALSE
  #endif
  	    );
      if (ffname != NULL)
      {
  	buf = buflist_findname(ffname);
  	vim_free(ffname);
      }
      return buf;
  }
  #endif
  
  /*
   * Find file in buffer list by name (it has to be for the current window).
   * "ffname" must have a full path.
   * Skips dummy buffers.
   * Returns NULL if not found.
   */
      buf_T *
  buflist_findname(char_u *ffname)
  {
  #ifdef UNIX
      stat_T	st;
  
      if (mch_stat((char *)ffname, &st) < 0)
  	st.st_dev = (dev_T)-1;
      return buflist_findname_stat(ffname, &st);
  }
  
  /*
   * Same as buflist_findname(), but pass the stat structure to avoid getting it
   * twice for the same file.
   * Returns NULL if not found.
   */
      static buf_T *
  buflist_findname_stat(
      char_u	*ffname,
      stat_T	*stp)
  {
  #endif
      buf_T	*buf;
  
      // Start at the last buffer, expect to find a match sooner.
      FOR_ALL_BUFS_FROM_LAST(buf)
  	if ((buf->b_flags & BF_DUMMY) == 0 && !otherfile_buf(buf, ffname
  #ifdef UNIX
  		    , stp
  #endif
  		    ))
  	    return buf;
      return NULL;
  }
  
  /*
   * Find file in buffer list by a regexp pattern.
   * Return fnum of the found buffer.
   * Return < 0 for error.
   */
      int
  buflist_findpat(
      char_u	*pattern,
      char_u	*pattern_end,	// pointer to first char after pattern
      int		unlisted,	// find unlisted buffers
      int		diffmode UNUSED, // find diff-mode buffers only
      int		curtab_only)	// find buffers in current tab only
  {
      buf_T	*buf;
      int		match = -1;
      int		find_listed;
      char_u	*pat;
      char_u	*patend;
      int		attempt;
      char_u	*p;
      int		toggledollar;
  
      // "%" is current file, "%%" or "#" is alternate file
      if ((pattern_end == pattern + 1 && (*pattern == '%' || *pattern == '#'))
  	    || (in_vim9script() && pattern_end == pattern + 2
  				    && pattern[0] == '%' && pattern[1] == '%'))
      {
  	if (*pattern == '#' || pattern_end == pattern + 2)
  	    match = curwin->w_alt_fnum;
  	else
  	    match = curbuf->b_fnum;
  #ifdef FEAT_DIFF
  	if (diffmode && !diff_mode_buf(buflist_findnr(match)))
  	    match = -1;
  #endif
      }
  
      /*
       * Try four ways of matching a listed buffer:
       * attempt == 0: without '^' or '$' (at any position)
       * attempt == 1: with '^' at start (only at position 0)
       * attempt == 2: with '$' at end (only match at end)
       * attempt == 3: with '^' at start and '$' at end (only full match)
       * Repeat this for finding an unlisted buffer if there was no matching
       * listed buffer.
       */
      else
      {
  	pat = file_pat_to_reg_pat(pattern, pattern_end, NULL, FALSE);
  	if (pat == NULL)
  	    return -1;
  	patend = pat + STRLEN(pat) - 1;
  	toggledollar = (patend > pat && *patend == '$');
  
  	// First try finding a listed buffer.  If not found and "unlisted"
  	// is TRUE, try finding an unlisted buffer.
  	find_listed = TRUE;
  	for (;;)
  	{
  	    for (attempt = 0; attempt <= 3; ++attempt)
  	    {
  		regmatch_T	regmatch;
  
  		// may add '^' and '$'
  		if (toggledollar)
  		    *patend = (attempt < 2) ? NUL : '$'; // add/remove '$'
  		p = pat;
  		if (*p == '^' && !(attempt & 1))	 // add/remove '^'
  		    ++p;
  		regmatch.regprog = vim_regcomp(p, magic_isset() ? RE_MAGIC : 0);
  		if (regmatch.regprog == NULL)
  		{
  		    vim_free(pat);
  		    return -1;
  		}
  
  		FOR_ALL_BUFS_FROM_LAST(buf)
  		    if (buf->b_p_bl == find_listed
  #ifdef FEAT_DIFF
  			    && (!diffmode || diff_mode_buf(buf))
  #endif
  			    && buflist_match(&regmatch, buf, FALSE) != NULL)
  		    {
  			if (curtab_only)
  			{
  			    // Ignore the match if the buffer is not open in
  			    // the current tab.
  			    win_T	*wp;
  
  			    FOR_ALL_WINDOWS(wp)
  				if (wp->w_buffer == buf)
  				    break;
  			    if (wp == NULL)
  				continue;
  			}
  			if (match >= 0)		// already found a match
  			{
  			    match = -2;
  			    break;
  			}
  			match = buf->b_fnum;	// remember first match
  		    }
  
  		vim_regfree(regmatch.regprog);
  		if (match >= 0)			// found one match
  		    break;
  	    }
  
  	    // Only search for unlisted buffers if there was no match with
  	    // a listed buffer.
  	    if (!unlisted || !find_listed || match != -1)
  		break;
  	    find_listed = FALSE;
  	}
  
  	vim_free(pat);
      }
  
      if (match == -2)
  	semsg(_(e_more_than_one_match_for_str), pattern);
      else if (match < 0)
  	semsg(_(e_no_matching_buffer_for_str), pattern);
      return match;
  }
  
  #ifdef FEAT_VIMINFO
  typedef struct {
      buf_T   *buf;
      char_u  *match;
  } bufmatch_T;
  #endif
  
  /*
   * Find all buffer names that match.
   * For command line expansion of ":buf" and ":sbuf".
   * Return OK if matches found, FAIL otherwise.
   */
      int
  ExpandBufnames(
      char_u	*pat,
      int		*num_file,
      char_u	***file,
      int		options)
  {
      int		count = 0;
      buf_T	*buf;
      int		round;
      char_u	*p;
      int		attempt;
      char_u	*patc = NULL;
  #ifdef FEAT_VIMINFO
      bufmatch_T	*matches = NULL;
  #endif
      int		fuzzy;
      fuzmatch_str_T  *fuzmatch = NULL;
  
      *num_file = 0;		    // return values in case of FAIL
      *file = NULL;
  
  #ifdef FEAT_DIFF
      if ((options & BUF_DIFF_FILTER) && !curwin->w_p_diff)
  	return FAIL;
  #endif
  
      fuzzy = cmdline_fuzzy_complete(pat);
  
      // Make a copy of "pat" and change "^" to "\(^\|[\/]\)" (if doing regular
      // expression matching)
      if (!fuzzy)
      {
  	if (*pat == '^')
  	{
  	    patc = alloc(STRLEN(pat) + 11);
  	    if (patc == NULL)
  		return FAIL;
  	    STRCPY(patc, "\\(^\\|[\\/]\\)");
  	    STRCPY(patc + 11, pat + 1);
  	}
  	else
  	    patc = pat;
      }
  
      // attempt == 0: try match with    '\<', match at start of word
      // attempt == 1: try match without '\<', match anywhere
      for (attempt = 0; attempt <= (fuzzy ? 0 : 1); ++attempt)
      {
  	regmatch_T	regmatch;
  	int		score = 0;
  
  	if (!fuzzy)
  	{
  	    if (attempt > 0 && patc == pat)
  		break;	// there was no anchor, no need to try again
  	    regmatch.regprog = vim_regcomp(patc + attempt * 11, RE_MAGIC);
  	    if (regmatch.regprog == NULL)
  	    {
  		if (patc != pat)
  		    vim_free(patc);
  		return FAIL;
  	    }
  	}
  
  	// round == 1: Count the matches.
  	// round == 2: Build the array to keep the matches.
  	for (round = 1; round <= 2; ++round)
  	{
  	    count = 0;
  	    FOR_ALL_BUFFERS(buf)
  	    {
  		if (!buf->b_p_bl)	// skip unlisted buffers
  		    continue;
  #ifdef FEAT_DIFF
  		if (options & BUF_DIFF_FILTER)
  		    // Skip buffers not suitable for
  		    // :diffget or :diffput completion.
  		    if (buf == curbuf || !diff_mode_buf(buf))
  			continue;
  #endif
  
  		if (!fuzzy)
  		    p = buflist_match(&regmatch, buf, p_wic);
  		else
  		{
  		    p = NULL;
  		    // first try matching with the short file name
  		    if ((score = fuzzy_match_str(buf->b_sfname, pat)) != 0)
  			p = buf->b_sfname;
  		    if (p == NULL)
  		    {
  			// next try matching with the full path file name
  			if ((score = fuzzy_match_str(buf->b_ffname, pat)) != 0)
  			    p = buf->b_ffname;
  		    }
  		}
  
  		if (p == NULL)
  		    continue;
  
  		if (round == 1)
  		{
  		    ++count;
  		    continue;
  		}
  
  		if (options & WILD_HOME_REPLACE)
  		    p = home_replace_save(buf, p);
  		else
  		    p = vim_strsave(p);
  
  		if (!fuzzy)
  		{
  #ifdef FEAT_VIMINFO
  		    if (matches != NULL)
  		    {
  			matches[count].buf = buf;
  			matches[count].match = p;
  			count++;
  		    }
  		    else
  #endif
  			(*file)[count++] = p;
  		}
  		else
  		{
  		    fuzmatch[count].idx = count;
  		    fuzmatch[count].str = p;
  		    fuzmatch[count].score = score;
  		    count++;
  		}
  	    }
  	    if (count == 0)	// no match found, break here
  		break;
  	    if (round == 1)
  	    {
  		if (!fuzzy)
  		{
  		    *file = ALLOC_MULT(char_u *, count);
  		    if (*file == NULL)
  		    {
  			vim_regfree(regmatch.regprog);
  			if (patc != pat)
  			    vim_free(patc);
  			return FAIL;
  		    }
  #ifdef FEAT_VIMINFO
  		    if (options & WILD_BUFLASTUSED)
  			matches = ALLOC_MULT(bufmatch_T, count);
  #endif
  		}
  		else
  		{
  		    fuzmatch = ALLOC_MULT(fuzmatch_str_T, count);
  		    if (fuzmatch == NULL)
  		    {
  			*num_file = 0;
  			*file = NULL;
  			return FAIL;
  		    }
  		}
  	    }
  	}
  
  	if (!fuzzy)
  	{
  	    vim_regfree(regmatch.regprog);
  	    if (count)		// match(es) found, break here
  		break;
  	}
      }
  
      if (!fuzzy && patc != pat)
  	vim_free(patc);
  
  #ifdef FEAT_VIMINFO
      if (!fuzzy)
      {
  	if (matches != NULL)
  	{
  	    int i;
  	    if (count > 1)
  		qsort(matches, count, sizeof(bufmatch_T), buf_compare);
  	    // if the current buffer is first in the list, place it at the end
  	    if (matches[0].buf == curbuf)
  	    {
  		for (i = 1; i < count; i++)
  		    (*file)[i-1] = matches[i].match;
  		(*file)[count-1] = matches[0].match;
  	    }
  	    else
  	    {
  		for (i = 0; i < count; i++)
  		    (*file)[i] = matches[i].match;
  	    }
  	    vim_free(matches);
  	}
      }
      else
      {
  	if (fuzzymatches_to_strmatches(fuzmatch, file, count, FALSE) == FAIL)
  	    return FAIL;
      }
  #endif
  
      *num_file = count;
      return (count == 0 ? FAIL : OK);
  }
  
  /*
   * Check for a match on the file name for buffer "buf" with regprog "prog".
   */
      static char_u *
  buflist_match(
      regmatch_T	*rmp,
      buf_T	*buf,
      int		ignore_case)  // when TRUE ignore case, when FALSE use 'fic'
  {
      char_u	*match;
  
      // First try the short file name, then the long file name.
      match = fname_match(rmp, buf->b_sfname, ignore_case);
      if (match == NULL)
  	match = fname_match(rmp, buf->b_ffname, ignore_case);
  
      return match;
  }
  
  /*
   * Try matching the regexp in "prog" with file name "name".
   * Return "name" when there is a match, NULL when not.
   */
      static char_u *
  fname_match(
      regmatch_T	*rmp,
      char_u	*name,
      int		ignore_case)  // when TRUE ignore case, when FALSE use 'fic'
  {
      char_u	*match = NULL;
      char_u	*p;
  
      if (name != NULL)
      {
  	// Ignore case when 'fileignorecase' or the argument is set.
  	rmp->rm_ic = p_fic || ignore_case;
  	if (vim_regexec(rmp, name, (colnr_T)0))
  	    match = name;
  	else if (rmp->regprog != NULL)
  	{
  	    // Replace $(HOME) with '~' and try matching again.
  	    p = home_replace_save(NULL, name);
  	    if (p != NULL && vim_regexec(rmp, p, (colnr_T)0))
  		match = name;
  	    vim_free(p);
  	}
      }
  
      return match;
  }
  
  /*
   * Find a file in the buffer list by buffer number.
   */
      buf_T *
  buflist_findnr(int nr)
  {
      char_u	key[VIM_SIZEOF_INT * 2 + 1];
      hashitem_T	*hi;
  
      if (nr == 0)
  	nr = curwin->w_alt_fnum;
      sprintf((char *)key, "%x", nr);
      hi = hash_find(&buf_hashtab, key);
  
      if (!HASHITEM_EMPTY(hi))
  	return (buf_T *)(hi->hi_key
  			     - ((unsigned)(curbuf->b_key - (char_u *)curbuf)));
      return NULL;
  }
  
  /*
   * Get name of file 'n' in the buffer list.
   * When the file has no name an empty string is returned.
   * home_replace() is used to shorten the file name (used for marks).
   * Returns a pointer to allocated memory, of NULL when failed.
   */
      char_u *
  buflist_nr2name(
      int		n,
      int		fullname,
      int		helptail)	// for help buffers return tail only
  {
      buf_T	*buf;
  
      buf = buflist_findnr(n);
      if (buf == NULL)
  	return NULL;
      return home_replace_save(helptail ? buf : NULL,
  				     fullname ? buf->b_ffname : buf->b_fname);
  }
  
  /*
   * Set the "lnum" and "col" for the buffer "buf" and the current window.
   * When "copy_options" is TRUE save the local window option values.
   * When "lnum" is 0 only do the options.
   */
      void
  buflist_setfpos(
      buf_T	*buf,
      win_T	*win,		// may be NULL when using :badd
      linenr_T	lnum,
      colnr_T	col,
      int		copy_options)
  {
      wininfo_T	*wip;
  
      FOR_ALL_BUF_WININFO(buf, wip)
  	if (wip->wi_win == win)
  	    break;
      if (wip == NULL)
      {
  	// allocate a new entry
  	wip = ALLOC_CLEAR_ONE(wininfo_T);
  	if (wip == NULL)
  	    return;
  	wip->wi_win = win;
  	if (lnum == 0)		// set lnum even when it's 0
  	    lnum = 1;
      }
      else
      {
  	// remove the entry from the list
  	if (wip->wi_prev)
  	    wip->wi_prev->wi_next = wip->wi_next;
  	else
  	    buf->b_wininfo = wip->wi_next;
  	if (wip->wi_next)
  	    wip->wi_next->wi_prev = wip->wi_prev;
  	if (copy_options && wip->wi_optset)
  	{
  	    clear_winopt(&wip->wi_opt);
  #ifdef FEAT_FOLDING
  	    deleteFoldRecurse(&wip->wi_folds);
  #endif
  	}
      }
      if (lnum != 0)
      {
  	wip->wi_fpos.lnum = lnum;
  	wip->wi_fpos.col = col;
      }
      if (win != NULL)
  	wip->wi_changelistidx = win->w_changelistidx;
      if (copy_options && win != NULL)
      {
  	// Save the window-specific option values.
  	copy_winopt(&win->w_onebuf_opt, &wip->wi_opt);
  #ifdef FEAT_FOLDING
  	wip->wi_fold_manual = win->w_fold_manual;
  	cloneFoldGrowArray(&win->w_folds, &wip->wi_folds);
  #endif
  	wip->wi_optset = TRUE;
      }
  
      // insert the entry in front of the list
      wip->wi_next = buf->b_wininfo;
      buf->b_wininfo = wip;
      wip->wi_prev = NULL;
      if (wip->wi_next)
  	wip->wi_next->wi_prev = wip;
  }
  
  #ifdef FEAT_DIFF
  /*
   * Return TRUE when "wip" has 'diff' set and the diff is only for another tab
   * page.  That's because a diff is local to a tab page.
   */
      static int
  wininfo_other_tab_diff(wininfo_T *wip)
  {
      win_T	*wp;
  
      if (wip->wi_opt.wo_diff)
      {
  	FOR_ALL_WINDOWS(wp)
  	    // return FALSE when it's a window in the current tab page, thus
  	    // the buffer was in diff mode here
  	    if (wip->wi_win == wp)
  		return FALSE;
  	return TRUE;
      }
      return FALSE;
  }
  #endif
  
  /*
   * Find info for the current window in buffer "buf".
   * If not found, return the info for the most recently used window.
   * When "need_options" is TRUE skip entries where wi_optset is FALSE.
   * When "skip_diff_buffer" is TRUE avoid windows with 'diff' set that is in
   * another tab page.
   * Returns NULL when there isn't any info.
   */
      static wininfo_T *
  find_wininfo(
      buf_T	*buf,
      int		need_options,
      int		skip_diff_buffer UNUSED)
  {
      wininfo_T	*wip;
  
      FOR_ALL_BUF_WININFO(buf, wip)
  	if (wip->wi_win == curwin
  #ifdef FEAT_DIFF
  		&& (!skip_diff_buffer || !wininfo_other_tab_diff(wip))
  #endif
  
  		&& (!need_options || wip->wi_optset))
  	    break;
  
      // If no wininfo for curwin, use the first in the list (that doesn't have
      // 'diff' set and is in another tab page).
      // If "need_options" is TRUE skip entries that don't have options set,
      // unless the window is editing "buf", so we can copy from the window
      // itself.
      if (wip == NULL)
      {
  #ifdef FEAT_DIFF
  	if (skip_diff_buffer)
  	{
  	    FOR_ALL_BUF_WININFO(buf, wip)
  		if (!wininfo_other_tab_diff(wip)
  			&& (!need_options || wip->wi_optset
  			    || (wip->wi_win != NULL
  					     && wip->wi_win->w_buffer == buf)))
  		    break;
  	}
  	else
  #endif
  	    wip = buf->b_wininfo;
      }
      return wip;
  }
  
  /*
   * Reset the local window options to the values last used in this window.
   * If the buffer wasn't used in this window before, use the values from
   * the most recently used window.  If the values were never set, use the
   * global values for the window.
   */
      void
  get_winopts(buf_T *buf)
  {
      wininfo_T	*wip;
  
      clear_winopt(&curwin->w_onebuf_opt);
  #ifdef FEAT_FOLDING
      clearFolding(curwin);
  #endif
  
      wip = find_wininfo(buf, TRUE, TRUE);
      if (wip != NULL && wip->wi_win != NULL
  	    && wip->wi_win != curwin && wip->wi_win->w_buffer == buf)
      {
  	// The buffer is currently displayed in the window: use the actual
  	// option values instead of the saved (possibly outdated) values.
  	win_T *wp = wip->wi_win;
  
  	copy_winopt(&wp->w_onebuf_opt, &curwin->w_onebuf_opt);
  #ifdef FEAT_FOLDING
  	curwin->w_fold_manual = wp->w_fold_manual;
  	curwin->w_foldinvalid = TRUE;
  	cloneFoldGrowArray(&wp->w_folds, &curwin->w_folds);
  #endif
      }
      else if (wip != NULL && wip->wi_optset)
      {
  	// the buffer was displayed in the current window earlier
  	copy_winopt(&wip->wi_opt, &curwin->w_onebuf_opt);
  #ifdef FEAT_FOLDING
  	curwin->w_fold_manual = wip->wi_fold_manual;
  	curwin->w_foldinvalid = TRUE;
  	cloneFoldGrowArray(&wip->wi_folds, &curwin->w_folds);
  #endif
      }
      else
  	copy_winopt(&curwin->w_allbuf_opt, &curwin->w_onebuf_opt);
      if (wip != NULL)
  	curwin->w_changelistidx = wip->wi_changelistidx;
  
  #ifdef FEAT_FOLDING
      // Set 'foldlevel' to 'foldlevelstart' if it's not negative.
      if (p_fdls >= 0)
  	curwin->w_p_fdl = p_fdls;
  #endif
      after_copy_winopt(curwin);
  }
  
  /*
   * Find the position (lnum and col) for the buffer 'buf' for the current
   * window.
   * Returns a pointer to no_position if no position is found.
   */
      pos_T *
  buflist_findfpos(buf_T *buf)
  {
      wininfo_T	*wip;
      static pos_T no_position = {1, 0, 0};
  
      wip = find_wininfo(buf, FALSE, FALSE);
      if (wip != NULL)
  	return &(wip->wi_fpos);
      else
  	return &no_position;
  }
  
  /*
   * Find the lnum for the buffer 'buf' for the current window.
   */
      linenr_T
  buflist_findlnum(buf_T *buf)
  {
      return buflist_findfpos(buf)->lnum;
  }
  
  /*
   * List all known file names (for :files and :buffers command).
   */
      void
  buflist_list(exarg_T *eap)
  {
      buf_T	*buf = firstbuf;
      int		len;
      int		i;
      int		ro_char;
      int		changed_char;
  #ifdef FEAT_TERMINAL
      int		job_running;
      int		job_none_open;
  #endif
  
  #ifdef FEAT_VIMINFO
      garray_T	buflist;
      buf_T	**buflist_data = NULL, **p;
  
      if (vim_strchr(eap->arg, 't'))
      {
  	ga_init2(&buflist, sizeof(buf_T *), 50);
  	FOR_ALL_BUFFERS(buf)
  	{
  	    if (ga_grow(&buflist, 1) == OK)
  		((buf_T **)buflist.ga_data)[buflist.ga_len++] = buf;
  	}
  
  	qsort(buflist.ga_data, (size_t)buflist.ga_len,
  		sizeof(buf_T *), buf_compare);
  
  	buflist_data = (buf_T **)buflist.ga_data;
  	buf = *buflist_data;
      }
      p = buflist_data;
  
      for (; buf != NULL && !got_int; buf = buflist_data != NULL
  	    ? (++p < buflist_data + buflist.ga_len ? *p : NULL)
  	    : buf->b_next)
  #else
      for (buf = firstbuf; buf != NULL && !got_int; buf = buf->b_next)
  #endif
      {
  #ifdef FEAT_TERMINAL
  	job_running = term_job_running(buf->b_term);
  	job_none_open = job_running && term_none_open(buf->b_term);
  #endif
  	// skip unlisted buffers, unless ! was used
  	if ((!buf->b_p_bl && !eap->forceit && !vim_strchr(eap->arg, 'u'))
  		|| (vim_strchr(eap->arg, 'u') && buf->b_p_bl)
  		|| (vim_strchr(eap->arg, '+')
  			&& ((buf->b_flags & BF_READERR) || !bufIsChanged(buf)))
  		|| (vim_strchr(eap->arg, 'a')
  			&& (buf->b_ml.ml_mfp == NULL || buf->b_nwindows == 0))
  		|| (vim_strchr(eap->arg, 'h')
  			&& (buf->b_ml.ml_mfp == NULL || buf->b_nwindows != 0))
  #ifdef FEAT_TERMINAL
  		|| (vim_strchr(eap->arg, 'R')
  			&& (!job_running || (job_running && job_none_open)))
  		|| (vim_strchr(eap->arg, '?')
  			&& (!job_running || (job_running && !job_none_open)))
  		|| (vim_strchr(eap->arg, 'F')
  			&& (job_running || buf->b_term == NULL))
  #endif
  		|| (vim_strchr(eap->arg, '-') && buf->b_p_ma)
  		|| (vim_strchr(eap->arg, '=') && !buf->b_p_ro)
  		|| (vim_strchr(eap->arg, 'x') && !(buf->b_flags & BF_READERR))
  		|| (vim_strchr(eap->arg, '%') && buf != curbuf)
  		|| (vim_strchr(eap->arg, '#')
  		      && (buf == curbuf || curwin->w_alt_fnum != buf->b_fnum)))
  	    continue;
  	if (buf_spname(buf) != NULL)
  	    vim_strncpy(NameBuff, buf_spname(buf), MAXPATHL - 1);
  	else
  	    home_replace(buf, buf->b_fname, NameBuff, MAXPATHL, TRUE);
  	if (message_filtered(NameBuff))
  	    continue;
  
  	changed_char = (buf->b_flags & BF_READERR) ? 'x'
  					     : (bufIsChanged(buf) ? '+' : ' ');
  #ifdef FEAT_TERMINAL
  	if (term_job_running(buf->b_term))
  	{
  	    if (term_none_open(buf->b_term))
  		ro_char = '?';
  	    else
  		ro_char = 'R';
  	    changed_char = ' ';  // bufIsChanged() returns TRUE to avoid
  				 // closing, but it's not actually changed.
  	}
  	else if (buf->b_term != NULL)
  	    ro_char = 'F';
  	else
  #endif
  	    ro_char = !buf->b_p_ma ? '-' : (buf->b_p_ro ? '=' : ' ');
  
  	msg_putchar('\n');
  	len = vim_snprintf((char *)IObuff, IOSIZE - 20, "%3d%c%c%c%c%c \"%s\"",
  		buf->b_fnum,
  		buf->b_p_bl ? ' ' : 'u',
  		buf == curbuf ? '%' :
  			(curwin->w_alt_fnum == buf->b_fnum ? '#' : ' '),
  		buf->b_ml.ml_mfp == NULL ? ' ' :
  			(buf->b_nwindows == 0 ? 'h' : 'a'),
  		ro_char,
  		changed_char,
  		NameBuff);
  	if (len > IOSIZE - 20)
  	    len = IOSIZE - 20;
  
  	// put "line 999" in column 40 or after the file name
  	i = 40 - vim_strsize(IObuff);
  	do
  	    IObuff[len++] = ' ';
  	while (--i > 0 && len < IOSIZE - 18);
  #ifdef FEAT_VIMINFO
  	if (vim_strchr(eap->arg, 't') && buf->b_last_used)
  	    add_time(IObuff + len, (size_t)(IOSIZE - len), buf->b_last_used);
  	else
  #endif
  	    vim_snprintf((char *)IObuff + len, (size_t)(IOSIZE - len),
  		    _("line %ld"), buf == curbuf ? curwin->w_cursor.lnum
  					       : (long)buflist_findlnum(buf));
  	msg_outtrans(IObuff);
  	out_flush();	    // output one line at a time
  	ui_breakcheck();
      }
  
  #ifdef FEAT_VIMINFO
      if (buflist_data)
  	ga_clear(&buflist);
  #endif
  }
  
  /*
   * Get file name and line number for file 'fnum'.
   * Used by DoOneCmd() for translating '%' and '#'.
   * Used by insert_reg() and cmdline_paste() for '#' register.
   * Return FAIL if not found, OK for success.
   */
      int
  buflist_name_nr(
      int		fnum,
      char_u	**fname,
      linenr_T	*lnum)
  {
      buf_T	*buf;
  
      buf = buflist_findnr(fnum);
      if (buf == NULL || buf->b_fname == NULL)
  	return FAIL;
  
      *fname = buf->b_fname;
      *lnum = buflist_findlnum(buf);
  
      return OK;
  }
  
  /*
   * Set the file name for "buf"' to "ffname_arg", short file name to
   * "sfname_arg".
   * The file name with the full path is also remembered, for when :cd is used.
   * Returns FAIL for failure (file name already in use by other buffer)
   *	OK otherwise.
   */
      int
  setfname(
      buf_T	*buf,
      char_u	*ffname_arg,
      char_u	*sfname_arg,
      int		message)	// give message when buffer already exists
  {
      char_u	*ffname = ffname_arg;
      char_u	*sfname = sfname_arg;
      buf_T	*obuf = NULL;
  #ifdef UNIX
      stat_T	st;
  #endif
  
      if (ffname == NULL || *ffname == NUL)
      {
  	// Removing the name.
  	if (buf->b_sfname != buf->b_ffname)
  	    VIM_CLEAR(buf->b_sfname);
  	else
  	    buf->b_sfname = NULL;
  	VIM_CLEAR(buf->b_ffname);
  #ifdef UNIX
  	st.st_dev = (dev_T)-1;
  #endif
      }
      else
      {
  	fname_expand(buf, &ffname, &sfname); // will allocate ffname
  	if (ffname == NULL)		    // out of memory
  	    return FAIL;
  
  	/*
  	 * If the file name is already used in another buffer:
  	 * - if the buffer is loaded, fail
  	 * - if the buffer is not loaded, delete it from the list
  	 */
  #ifdef UNIX
  	if (mch_stat((char *)ffname, &st) < 0)
  	    st.st_dev = (dev_T)-1;
  #endif
  	if (!(buf->b_flags & BF_DUMMY))
  #ifdef UNIX
  	    obuf = buflist_findname_stat(ffname, &st);
  #else
  	    obuf = buflist_findname(ffname);
  #endif
  	if (obuf != NULL && obuf != buf)
  	{
  	    win_T	*win;
  	    tabpage_T   *tab;
  	    int		in_use = FALSE;
  
  	    // during startup a window may use a buffer that is not loaded yet
  	    FOR_ALL_TAB_WINDOWS(tab, win)
  		if (win->w_buffer == obuf)
  		    in_use = TRUE;
  
  	    // it's loaded or used in a window, fail
  	    if (obuf->b_ml.ml_mfp != NULL || in_use)
  	    {
  		if (message)
  		    emsg(_(e_buffer_with_this_name_already_exists));
  		vim_free(ffname);
  		return FAIL;
  	    }
  	    // delete from the list
  	    close_buffer(NULL, obuf, DOBUF_WIPE, FALSE, FALSE);
  	}
  	sfname = vim_strsave(sfname);
  	if (ffname == NULL || sfname == NULL)
  	{
  	    vim_free(sfname);
  	    vim_free(ffname);
  	    return FAIL;
  	}
  #ifdef USE_FNAME_CASE
  	fname_case(sfname, 0);    // set correct case for short file name
  #endif
  	if (buf->b_sfname != buf->b_ffname)
  	    vim_free(buf->b_sfname);
  	vim_free(buf->b_ffname);
  	buf->b_ffname = ffname;
  	buf->b_sfname = sfname;
      }
      buf->b_fname = buf->b_sfname;
  #ifdef UNIX
      if (st.st_dev == (dev_T)-1)
  	buf->b_dev_valid = FALSE;
      else
      {
  	buf->b_dev_valid = TRUE;
  	buf->b_dev = st.st_dev;
  	buf->b_ino = st.st_ino;
      }
  #endif
  
      buf->b_shortname = FALSE;
  
      buf_name_changed(buf);
      return OK;
  }
  
  /*
   * Crude way of changing the name of a buffer.  Use with care!
   * The name should be relative to the current directory.
   */
      void
  buf_set_name(int fnum, char_u *name)
  {
      buf_T	*buf;
  
      buf = buflist_findnr(fnum);
      if (buf != NULL)
      {
  	if (buf->b_sfname != buf->b_ffname)
  	    vim_free(buf->b_sfname);
  	vim_free(buf->b_ffname);
  	buf->b_ffname = vim_strsave(name);
  	buf->b_sfname = NULL;
  	// Allocate ffname and expand into full path.  Also resolves .lnk
  	// files on Win32.
  	fname_expand(buf, &buf->b_ffname, &buf->b_sfname);
  	buf->b_fname = buf->b_sfname;
      }
  }
  
  /*
   * Take care of what needs to be done when the name of buffer "buf" has
   * changed.
   */
      void
  buf_name_changed(buf_T *buf)
  {
      /*
       * If the file name changed, also change the name of the swapfile
       */
      if (buf->b_ml.ml_mfp != NULL)
  	ml_setname(buf);
  
  #ifdef FEAT_TERMINAL
      if (buf->b_term != NULL)
  	term_clear_status_text(buf->b_term);
  #endif
  
      if (curwin->w_buffer == buf)
  	check_arg_idx(curwin);	// check file name for arg list
      maketitle();		// set window title
      status_redraw_all();	// status lines need to be redrawn
      fmarks_check_names(buf);	// check named file marks
      ml_timestamp(buf);		// reset timestamp
  }
  
  /*
   * set alternate file name for current window
   *
   * Used by do_one_cmd(), do_write() and do_ecmd().
   * Return the buffer.
   */
      buf_T *
  setaltfname(
      char_u	*ffname,
      char_u	*sfname,
      linenr_T	lnum)
  {
      buf_T	*buf;
  
      // Create a buffer.  'buflisted' is not set if it's a new buffer
      buf = buflist_new(ffname, sfname, lnum, 0);
      if (buf != NULL && (cmdmod.cmod_flags & CMOD_KEEPALT) == 0)
  	curwin->w_alt_fnum = buf->b_fnum;
      return buf;
  }
  
  /*
   * Get alternate file name for current window.
   * Return NULL if there isn't any, and give error message if requested.
   */
      char_u  *
  getaltfname(
      int		errmsg)		// give error message
  {
      char_u	*fname;
      linenr_T	dummy;
  
      if (buflist_name_nr(0, &fname, &dummy) == FAIL)
      {
  	if (errmsg)
  	    emsg(_(e_no_alternate_file));
  	return NULL;
      }
      return fname;
  }
  
  /*
   * Add a file name to the buflist and return its number.
   * Uses same flags as buflist_new(), except BLN_DUMMY.
   *
   * used by qf_init(), main() and doarglist()
   */
      int
  buflist_add(char_u *fname, int flags)
  {
      buf_T	*buf;
  
      buf = buflist_new(fname, NULL, (linenr_T)0, flags);
      if (buf != NULL)
  	return buf->b_fnum;
      return 0;
  }
  
  #if defined(BACKSLASH_IN_FILENAME) || defined(PROTO)
  /*
   * Adjust slashes in file names.  Called after 'shellslash' was set.
   */
      void
  buflist_slash_adjust(void)
  {
      buf_T	*bp;
  
      FOR_ALL_BUFFERS(bp)
      {
  	if (bp->b_ffname != NULL)
  	    slash_adjust(bp->b_ffname);
  	if (bp->b_sfname != NULL)
  	    slash_adjust(bp->b_sfname);
      }
  }
  #endif
  
  /*
   * Set alternate cursor position for the current buffer and window "win".
   * Also save the local window option values.
   */
      void
  buflist_altfpos(win_T *win)
  {
      buflist_setfpos(curbuf, win, win->w_cursor.lnum, win->w_cursor.col, TRUE);
  }
  
  /*
   * Return TRUE if 'ffname' is not the same file as current file.
   * Fname must have a full path (expanded by mch_FullName()).
   */
      int
  otherfile(char_u *ffname)
  {
      return otherfile_buf(curbuf, ffname
  #ifdef UNIX
  	    , NULL
  #endif
  	    );
  }
  
      static int
  otherfile_buf(
      buf_T		*buf,
      char_u		*ffname
  #ifdef UNIX
      , stat_T		*stp
  #endif
      )
  {
      // no name is different
      if (ffname == NULL || *ffname == NUL || buf->b_ffname == NULL)
  	return TRUE;
      if (fnamecmp(ffname, buf->b_ffname) == 0)
  	return FALSE;
  #ifdef UNIX
      {
  	stat_T	    st;
  
  	// If no stat_T given, get it now
  	if (stp == NULL)
  	{
  	    if (!buf->b_dev_valid || mch_stat((char *)ffname, &st) < 0)
  		st.st_dev = (dev_T)-1;
  	    stp = &st;
  	}
  	// Use dev/ino to check if the files are the same, even when the names
  	// are different (possible with links).  Still need to compare the
  	// name above, for when the file doesn't exist yet.
  	// Problem: The dev/ino changes when a file is deleted (and created
  	// again) and remains the same when renamed/moved.  We don't want to
  	// mch_stat() each buffer each time, that would be too slow.  Get the
  	// dev/ino again when they appear to match, but not when they appear
  	// to be different: Could skip a buffer when it's actually the same
  	// file.
  	if (buf_same_ino(buf, stp))
  	{
  	    buf_setino(buf);
  	    if (buf_same_ino(buf, stp))
  		return FALSE;
  	}
      }
  #endif
      return TRUE;
  }
  
  #if defined(UNIX) || defined(PROTO)
  /*
   * Set inode and device number for a buffer.
   * Must always be called when b_fname is changed!.
   */
      void
  buf_setino(buf_T *buf)
  {
      stat_T	st;
  
      if (buf->b_fname != NULL && mch_stat((char *)buf->b_fname, &st) >= 0)
      {
  	buf->b_dev_valid = TRUE;
  	buf->b_dev = st.st_dev;
  	buf->b_ino = st.st_ino;
      }
      else
  	buf->b_dev_valid = FALSE;
  }
  
  /*
   * Return TRUE if dev/ino in buffer "buf" matches with "stp".
   */
      static int
  buf_same_ino(
      buf_T	*buf,
      stat_T	*stp)
  {
      return (buf->b_dev_valid
  	    && stp->st_dev == buf->b_dev
  	    && stp->st_ino == buf->b_ino);
  }
  #endif
  
  /*
   * Print info about the current buffer.
   */
      void
  fileinfo(
      int fullname,	    // when non-zero print full path
      int shorthelp,
      int	dont_truncate)
  {
      char_u	*name;
      int		n;
      char	*p;
      char	*buffer;
      size_t	len;
  
      buffer = alloc(IOSIZE);
      if (buffer == NULL)
  	return;
  
      if (fullname > 1)	    // 2 CTRL-G: include buffer number
      {
  	vim_snprintf(buffer, IOSIZE, "buf %d: ", curbuf->b_fnum);
  	p = buffer + STRLEN(buffer);
      }
      else
  	p = buffer;
  
      *p++ = '"';
      if (buf_spname(curbuf) != NULL)
  	vim_strncpy((char_u *)p, buf_spname(curbuf), IOSIZE - (p - buffer) - 1);
      else
      {
  	if (!fullname && curbuf->b_fname != NULL)
  	    name = curbuf->b_fname;
  	else
  	    name = curbuf->b_ffname;
  	home_replace(shorthelp ? curbuf : NULL, name, (char_u *)p,
  					  (int)(IOSIZE - (p - buffer)), TRUE);
      }
  
      vim_snprintf_add(buffer, IOSIZE, "\"%s%s%s%s%s%s",
  	    curbufIsChanged() ? (shortmess(SHM_MOD)
  					  ?  " [+]" : _(" [Modified]")) : " ",
  	    (curbuf->b_flags & BF_NOTEDITED)
  #ifdef FEAT_QUICKFIX
  		    && !bt_dontwrite(curbuf)
  #endif
  					? _("[Not edited]") : "",
  	    (curbuf->b_flags & BF_NEW)
  #ifdef FEAT_QUICKFIX
  		    && !bt_dontwrite(curbuf)
  #endif
  					   ? new_file_message() : "",
  	    (curbuf->b_flags & BF_READERR) ? _("[Read errors]") : "",
  	    curbuf->b_p_ro ? (shortmess(SHM_RO) ? _("[RO]")
  						      : _("[readonly]")) : "",
  	    (curbufIsChanged() || (curbuf->b_flags & BF_WRITE_MASK)
  							  || curbuf->b_p_ro) ?
  								    " " : "");
      // With 32 bit longs and more than 21,474,836 lines multiplying by 100
      // causes an overflow, thus for large numbers divide instead.
      if (curwin->w_cursor.lnum > 1000000L)
  	n = (int)(((long)curwin->w_cursor.lnum) /
  				   ((long)curbuf->b_ml.ml_line_count / 100L));
      else
  	n = (int)(((long)curwin->w_cursor.lnum * 100L) /
  					    (long)curbuf->b_ml.ml_line_count);
      if (curbuf->b_ml.ml_flags & ML_EMPTY)
  	vim_snprintf_add(buffer, IOSIZE, "%s", _(no_lines_msg));
  #ifdef FEAT_CMDL_INFO
      else if (p_ru)
  	// Current line and column are already on the screen -- webb
  	vim_snprintf_add(buffer, IOSIZE,
  		NGETTEXT("%ld line --%d%%--", "%ld lines --%d%%--",
  						   curbuf->b_ml.ml_line_count),
  		(long)curbuf->b_ml.ml_line_count, n);
  #endif
      else
      {
  	vim_snprintf_add(buffer, IOSIZE,
  		_("line %ld of %ld --%d%%-- col "),
  		(long)curwin->w_cursor.lnum,
  		(long)curbuf->b_ml.ml_line_count,
  		n);
  	validate_virtcol();
  	len = STRLEN(buffer);
  	col_print((char_u *)buffer + len, IOSIZE - len,
  		   (int)curwin->w_cursor.col + 1, (int)curwin->w_virtcol + 1);
      }
  
      (void)append_arg_number(curwin, (char_u *)buffer, IOSIZE,
  							 !shortmess(SHM_FILE));
  
      if (dont_truncate)
      {
  	// Temporarily set msg_scroll to avoid the message being truncated.
  	// First call msg_start() to get the message in the right place.
  	msg_start();
  	n = msg_scroll;
  	msg_scroll = TRUE;
  	msg(buffer);
  	msg_scroll = n;
      }
      else
      {
  	p = msg_trunc_attr(buffer, FALSE, 0);
  	if (restart_edit != 0 || (msg_scrolled && !need_wait_return))
  	    // Need to repeat the message after redrawing when:
  	    // - When restart_edit is set (otherwise there will be a delay
  	    //   before redrawing).
  	    // - When the screen was scrolled but there is no wait-return
  	    //   prompt.
  	    set_keep_msg((char_u *)p, 0);
      }
  
      vim_free(buffer);
  }
  
      void
  col_print(
      char_u  *buf,
      size_t  buflen,
      int	    col,
      int	    vcol)
  {
      if (col == vcol)
  	vim_snprintf((char *)buf, buflen, "%d", col);
      else
  	vim_snprintf((char *)buf, buflen, "%d-%d", col, vcol);
  }
  
  static char_u *lasttitle = NULL;
  static char_u *lasticon = NULL;
  
  /*
   * Put the file name in the title bar and icon of the window.
   */
      void
  maketitle(void)
  {
      char_u	*p;
      char_u	*title_str = NULL;
      char_u	*icon_str = NULL;
      int		maxlen = 0;
      int		len;
      int		mustset;
      char_u	buf[IOSIZE];
      int		off;
  
      if (!redrawing())
      {
  	// Postpone updating the title when 'lazyredraw' is set.
  	need_maketitle = TRUE;
  	return;
      }
  
      need_maketitle = FALSE;
      if (!p_title && !p_icon && lasttitle == NULL && lasticon == NULL)
  	return;  // nothing to do
  
      if (p_title)
      {
  	if (p_titlelen > 0)
  	{
  	    maxlen = p_titlelen * Columns / 100;
  	    if (maxlen < 10)
  		maxlen = 10;
  	}
  
  	title_str = buf;
  	if (*p_titlestring != NUL)
  	{
  #ifdef FEAT_STL_OPT
  	    if (stl_syntax & STL_IN_TITLE)
  	    {
  		int	use_sandbox = FALSE;
  		int	called_emsg_before = called_emsg;
  
  # ifdef FEAT_EVAL
  		use_sandbox = was_set_insecurely((char_u *)"titlestring", 0);
  # endif
  		build_stl_str_hl(curwin, title_str, sizeof(buf),
  					      p_titlestring, use_sandbox,
  					      0, maxlen, NULL, NULL);
  		if (called_emsg > called_emsg_before)
  		    set_string_option_direct((char_u *)"titlestring", -1,
  					   (char_u *)"", OPT_FREE, SID_ERROR);
  	    }
  	    else
  #endif
  		title_str = p_titlestring;
  	}
  	else
  	{
  	    // format: "fname + (path) (1 of 2) - VIM"
  
  #define SPACE_FOR_FNAME (IOSIZE - 100)
  #define SPACE_FOR_DIR   (IOSIZE - 20)
  #define SPACE_FOR_ARGNR (IOSIZE - 10)  // at least room for " - VIM"
  	    if (curbuf->b_fname == NULL)
  		vim_strncpy(buf, (char_u *)_("[No Name]"), SPACE_FOR_FNAME);
  #ifdef FEAT_TERMINAL
  	    else if (curbuf->b_term != NULL)
  	    {
  		vim_strncpy(buf, term_get_status_text(curbuf->b_term),
  							      SPACE_FOR_FNAME);
  	    }
  #endif
  	    else
  	    {
  		p = transstr(gettail(curbuf->b_fname));
  		vim_strncpy(buf, p, SPACE_FOR_FNAME);
  		vim_free(p);
  	    }
  
  #ifdef FEAT_TERMINAL
  	    if (curbuf->b_term == NULL)
  #endif
  		switch (bufIsChanged(curbuf)
  			+ (curbuf->b_p_ro * 2)
  			+ (!curbuf->b_p_ma * 4))
  		{
  		    case 1: STRCAT(buf, " +"); break;
  		    case 2: STRCAT(buf, " ="); break;
  		    case 3: STRCAT(buf, " =+"); break;
  		    case 4:
  		    case 6: STRCAT(buf, " -"); break;
  		    case 5:
  		    case 7: STRCAT(buf, " -+"); break;
  		}
  
  	    if (curbuf->b_fname != NULL
  #ifdef FEAT_TERMINAL
  		    && curbuf->b_term == NULL
  #endif
  		    )
  	    {
  		// Get path of file, replace home dir with ~
  		off = (int)STRLEN(buf);
  		buf[off++] = ' ';
  		buf[off++] = '(';
  		home_replace(curbuf, curbuf->b_ffname,
  					buf + off, SPACE_FOR_DIR - off, TRUE);
  #ifdef BACKSLASH_IN_FILENAME
  		// avoid "c:/name" to be reduced to "c"
  		if (isalpha(buf[off]) && buf[off + 1] == ':')
  		    off += 2;
  #endif
  		// remove the file name
  		p = gettail_sep(buf + off);
  		if (p == buf + off)
  		{
  		    // must be a help buffer
  		    vim_strncpy(buf + off, (char_u *)_("help"),
  					   (size_t)(SPACE_FOR_DIR - off - 1));
  		}
  		else
  		    *p = NUL;
  
  		// Translate unprintable chars and concatenate.  Keep some
  		// room for the server name.  When there is no room (very long
  		// file name) use (...).
  		if (off < SPACE_FOR_DIR)
  		{
  		    p = transstr(buf + off);
  		    vim_strncpy(buf + off, p, (size_t)(SPACE_FOR_DIR - off));
  		    vim_free(p);
  		}
  		else
  		{
  		    vim_strncpy(buf + off, (char_u *)"...",
  					     (size_t)(SPACE_FOR_ARGNR - off));
  		}
  		STRCAT(buf, ")");
  	    }
  
  	    append_arg_number(curwin, buf, SPACE_FOR_ARGNR, FALSE);
  
  #if defined(FEAT_CLIENTSERVER)
  	    if (serverName != NULL)
  	    {
  		STRCAT(buf, " - ");
  		vim_strcat(buf, serverName, IOSIZE);
  	    }
  	    else
  #endif
  		STRCAT(buf, " - VIM");
  
  	    if (maxlen > 0)
  	    {
  		// make it shorter by removing a bit in the middle
  		if (vim_strsize(buf) > maxlen)
  		    trunc_string(buf, buf, maxlen, IOSIZE);
  	    }
  	}
      }
      mustset = value_changed(title_str, &lasttitle);
  
      if (p_icon)
      {
  	icon_str = buf;
  	if (*p_iconstring != NUL)
  	{
  #ifdef FEAT_STL_OPT
  	    if (stl_syntax & STL_IN_ICON)
  	    {
  		int	use_sandbox = FALSE;
  		int	called_emsg_before = called_emsg;
  
  # ifdef FEAT_EVAL
  		use_sandbox = was_set_insecurely((char_u *)"iconstring", 0);
  # endif
  		build_stl_str_hl(curwin, icon_str, sizeof(buf),
  						    p_iconstring, use_sandbox,
  						    0, 0, NULL, NULL);
  		if (called_emsg > called_emsg_before)
  		    set_string_option_direct((char_u *)"iconstring", -1,
  					   (char_u *)"", OPT_FREE, SID_ERROR);
  	    }
  	    else
  #endif
  		icon_str = p_iconstring;
  	}
  	else
  	{
  	    if (buf_spname(curbuf) != NULL)
  		p = buf_spname(curbuf);
  	    else		    // use file name only in icon
  		p = gettail(curbuf->b_ffname);
  	    *icon_str = NUL;
  	    // Truncate name at 100 bytes.
  	    len = (int)STRLEN(p);
  	    if (len > 100)
  	    {
  		len -= 100;
  		if (has_mbyte)
  		    len += (*mb_tail_off)(p, p + len) + 1;
  		p += len;
  	    }
  	    STRCPY(icon_str, p);
  	    trans_characters(icon_str, IOSIZE);
  	}
      }
  
      mustset |= value_changed(icon_str, &lasticon);
  
      if (mustset)
  	resettitle();
  }
  
  /*
   * Used for title and icon: Check if "str" differs from "*last".  Set "*last"
   * from "str" if it does.
   * Return TRUE if resettitle() is to be called.
   */
      static int
  value_changed(char_u *str, char_u **last)
  {
      if ((str == NULL) != (*last == NULL)
  	    || (str != NULL && *last != NULL && STRCMP(str, *last) != 0))
      {
  	vim_free(*last);
  	if (str == NULL)
  	{
  	    *last = NULL;
  	    mch_restore_title(
  		  last == &lasttitle ? SAVE_RESTORE_TITLE : SAVE_RESTORE_ICON);
  	}
  	else
  	{
  	    *last = vim_strsave(str);
  	    return TRUE;
  	}
      }
      return FALSE;
  }
  
  /*
   * Put current window title back (used after calling a shell)
   */
      void
  resettitle(void)
  {
      mch_settitle(lasttitle, lasticon);
  }
  
  # if defined(EXITFREE) || defined(PROTO)
      void
  free_titles(void)
  {
      vim_free(lasttitle);
      vim_free(lasticon);
  }
  # endif
  
  
  #if defined(FEAT_STL_OPT) || defined(FEAT_GUI_TABLINE) || defined(PROTO)
  
  /*
   * Used for building in the status line.
   */
  typedef struct
  {
      char_u	*stl_start;
      int		stl_minwid;
      int		stl_maxwid;
      enum {
  	Normal,
  	Empty,
  	Group,
  	Middle,
  	Highlight,
  	TabPage,
  	Trunc
      }		stl_type;
  } stl_item_T;
  
  static size_t		stl_items_len = 20; // Initial value, grows as needed.
  static stl_item_T      *stl_items = NULL;
  static int	       *stl_groupitem = NULL;
  static stl_hlrec_T     *stl_hltab = NULL;
  static stl_hlrec_T     *stl_tabtab = NULL;
  
  /*
   * Build a string from the status line items in "fmt".
   * Return length of string in screen cells.
   *
   * Normally works for window "wp", except when working for 'tabline' then it
   * is "curwin".
   *
   * Items are drawn interspersed with the text that surrounds it
   * Specials: %-<wid>(xxx%) => group, %= => middle marker, %< => truncation
   * Item: %-<minwid>.<maxwid><itemch> All but <itemch> are optional
   *
   * If maxwidth is not zero, the string will be filled at any middle marker
   * or truncated if too long, fillchar is used for all whitespace.
   */
      int
  build_stl_str_hl(
      win_T	*wp,
      char_u	*out,		// buffer to write into != NameBuff
      size_t	outlen,		// length of out[]
      char_u	*fmt,
      int		use_sandbox UNUSED, // "fmt" was set insecurely, use sandbox
      int		fillchar,
      int		maxwidth,
      stl_hlrec_T **hltab,	// return: HL attributes (can be NULL)
      stl_hlrec_T **tabtab)	// return: tab page nrs (can be NULL)
  {
      linenr_T	lnum;
      size_t	len;
      char_u	*p;
      char_u	*s;
      char_u	*t;
      int		byteval;
  #ifdef FEAT_EVAL
      win_T	*save_curwin;
      buf_T	*save_curbuf;
      int		save_VIsual_active;
  #endif
      int		empty_line;
      colnr_T	virtcol;
      long	l;
      long	n;
      int		prevchar_isflag;
      int		prevchar_isitem;
      int		itemisflag;
      int		fillable;
      char_u	*str;
      long	num;
      int		width;
      int		itemcnt;
      int		curitem;
      int		group_end_userhl;
      int		group_start_userhl;
      int		groupdepth;
  #ifdef FEAT_EVAL
      int		evaldepth;
  #endif
      int		minwid;
      int		maxwid;
      int		zeropad;
      char_u	base;
      char_u	opt;
  #define TMPLEN 70
      char_u	buf_tmp[TMPLEN];
      char_u	win_tmp[TMPLEN];
      char_u	*usefmt = fmt;
      stl_hlrec_T *sp;
      int		save_must_redraw = must_redraw;
      int		save_redr_type = curwin->w_redr_type;
      int		save_KeyTyped = KeyTyped;
  
      if (stl_items == NULL)
      {
  	stl_items = ALLOC_MULT(stl_item_T, stl_items_len);
  	stl_groupitem = ALLOC_MULT(int, stl_items_len);
  
  	// Allocate one more, because the last element is used to indicate the
  	// end of the list.
  	stl_hltab  = ALLOC_MULT(stl_hlrec_T, stl_items_len + 1);
  	stl_tabtab = ALLOC_MULT(stl_hlrec_T, stl_items_len + 1);
      }
  
  #ifdef FEAT_EVAL
      /*
       * When the format starts with "%!" then evaluate it as an expression and
       * use the result as the actual format string.
       */
      if (fmt[0] == '%' && fmt[1] == '!')
      {
  	typval_T	tv;
  
  	tv.v_type = VAR_NUMBER;
  	tv.vval.v_number = wp->w_id;
  	set_var((char_u *)"g:statusline_winid", &tv, FALSE);
  
  	usefmt = eval_to_string_safe(fmt + 2, use_sandbox, FALSE);
  	if (usefmt == NULL)
  	    usefmt = fmt;
  
  	do_unlet((char_u *)"g:statusline_winid", TRUE);
      }
  #endif
  
      if (fillchar == 0)
  	fillchar = ' ';
  
      // The cursor in windows other than the current one isn't always
      // up-to-date, esp. because of autocommands and timers.
      lnum = wp->w_cursor.lnum;
      if (lnum > wp->w_buffer->b_ml.ml_line_count)
      {
  	lnum = wp->w_buffer->b_ml.ml_line_count;
  	wp->w_cursor.lnum = lnum;
      }
  
      // Get line & check if empty (cursorpos will show "0-1").  Note that
      // p will become invalid when getting another buffer line.
      p = ml_get_buf(wp->w_buffer, lnum, FALSE);
      empty_line = (*p == NUL);
  
      // Get the byte value now, in case we need it below. This is more efficient
      // than making a copy of the line.
      len = STRLEN(p);
      if (wp->w_cursor.col > (colnr_T)len)
      {
  	// Line may have changed since checking the cursor column, or the lnum
  	// was adjusted above.
  	wp->w_cursor.col = (colnr_T)len;
  	wp->w_cursor.coladd = 0;
  	byteval = 0;
      }
      else
  	byteval = (*mb_ptr2char)(p + wp->w_cursor.col);
  
      groupdepth = 0;
  #ifdef FEAT_EVAL
      evaldepth = 0;
  #endif
      p = out;
      curitem = 0;
      prevchar_isflag = TRUE;
      prevchar_isitem = FALSE;
      for (s = usefmt; *s; )
      {
  	if (curitem == (int)stl_items_len)
  	{
  	    size_t	new_len = stl_items_len * 3 / 2;
  	    stl_item_T	*new_items;
  	    int		*new_groupitem;
  	    stl_hlrec_T	*new_hlrec;
  
  	    new_items = vim_realloc(stl_items, sizeof(stl_item_T) * new_len);
  	    if (new_items == NULL)
  		break;
  	    stl_items = new_items;
  	    new_groupitem = vim_realloc(stl_groupitem, sizeof(int) * new_len);
  	    if (new_groupitem == NULL)
  		break;
  	    stl_groupitem = new_groupitem;
  	    new_hlrec = vim_realloc(stl_hltab,
  					  sizeof(stl_hlrec_T) * (new_len + 1));
  	    if (new_hlrec == NULL)
  		break;
  	    stl_hltab = new_hlrec;
  	    new_hlrec = vim_realloc(stl_tabtab,
  					  sizeof(stl_hlrec_T) * (new_len + 1));
  	    if (new_hlrec == NULL)
  		break;
  	    stl_tabtab = new_hlrec;
  	    stl_items_len = new_len;
  	}
  
  	if (*s != NUL && *s != '%')
  	    prevchar_isflag = prevchar_isitem = FALSE;
  
  	/*
  	 * Handle up to the next '%' or the end.
  	 */
  	while (*s != NUL && *s != '%' && p + 1 < out + outlen)
  	    *p++ = *s++;
  	if (*s == NUL || p + 1 >= out + outlen)
  	    break;
  
  	/*
  	 * Handle one '%' item.
  	 */
  	s++;
  	if (*s == NUL)  // ignore trailing %
  	    break;
  	if (*s == '%')
  	{
  	    if (p + 1 >= out + outlen)
  		break;
  	    *p++ = *s++;
  	    prevchar_isflag = prevchar_isitem = FALSE;
  	    continue;
  	}
  	if (*s == STL_MIDDLEMARK)
  	{
  	    s++;
  	    if (groupdepth > 0)
  		continue;
  	    stl_items[curitem].stl_type = Middle;
  	    stl_items[curitem++].stl_start = p;
  	    continue;
  	}
  	if (*s == STL_TRUNCMARK)
  	{
  	    s++;
  	    stl_items[curitem].stl_type = Trunc;
  	    stl_items[curitem++].stl_start = p;
  	    continue;
  	}
  	if (*s == ')')
  	{
  	    s++;
  	    if (groupdepth < 1)
  		continue;
  	    groupdepth--;
  
  	    t = stl_items[stl_groupitem[groupdepth]].stl_start;
  	    *p = NUL;
  	    l = vim_strsize(t);
  	    if (curitem > stl_groupitem[groupdepth] + 1
  		    && stl_items[stl_groupitem[groupdepth]].stl_minwid == 0)
  	    {
  		// remove group if all items are empty and highlight group
  		// doesn't change
  		group_start_userhl = group_end_userhl = 0;
  		for (n = stl_groupitem[groupdepth] - 1; n >= 0; n--)
  		{
  		    if (stl_items[n].stl_type == Highlight)
  		    {
  			group_start_userhl = group_end_userhl =
  						       stl_items[n].stl_minwid;
  			break;
  		    }
  		}
  		for (n = stl_groupitem[groupdepth] + 1; n < curitem; n++)
  		{
  		    if (stl_items[n].stl_type == Normal)
  			break;
  		    if (stl_items[n].stl_type == Highlight)
  			group_end_userhl = stl_items[n].stl_minwid;
  		}
  		if (n == curitem && group_start_userhl == group_end_userhl)
  		{
  		    // empty group
  		    p = t;
  		    l = 0;
  		    for (n = stl_groupitem[groupdepth] + 1; n < curitem; n++)
  		    {
  			// do not use the highlighting from the removed group
  			if (stl_items[n].stl_type == Highlight)
  			    stl_items[n].stl_type = Empty;
  			// adjust the start position of TabPage to the next
  			// item position
  			if (stl_items[n].stl_type == TabPage)
  			    stl_items[n].stl_start = p;
  		    }
  		}
  	    }
  	    if (l > stl_items[stl_groupitem[groupdepth]].stl_maxwid)
  	    {
  		// truncate, remove n bytes of text at the start
  		if (has_mbyte)
  		{
  		    // Find the first character that should be included.
  		    n = 0;
  		    while (l >= stl_items[stl_groupitem[groupdepth]].stl_maxwid)
  		    {
  			l -= ptr2cells(t + n);
  			n += (*mb_ptr2len)(t + n);
  		    }
  		}
  		else
  		    n = (long)(p - t) - stl_items[stl_groupitem[groupdepth]]
  							       .stl_maxwid + 1;
  
  		*t = '<';
  		mch_memmove(t + 1, t + n, (size_t)(p - (t + n)));
  		p = p - n + 1;
  
  		// Fill up space left over by half a double-wide char.
  		while (++l < stl_items[stl_groupitem[groupdepth]].stl_minwid)
  		    MB_CHAR2BYTES(fillchar, p);
  
  		// correct the start of the items for the truncation
  		for (l = stl_groupitem[groupdepth] + 1; l < curitem; l++)
  		{
  		    // Minus one for the leading '<' added above.
  		    stl_items[l].stl_start -= n - 1;
  		    if (stl_items[l].stl_start < t)
  			stl_items[l].stl_start = t;
  		}
  	    }
  	    else if (abs(stl_items[stl_groupitem[groupdepth]].stl_minwid) > l)
  	    {
  		// fill
  		n = stl_items[stl_groupitem[groupdepth]].stl_minwid;
  		if (n < 0)
  		{
  		    // fill by appending characters
  		    n = 0 - n;
  		    while (l++ < n && p + 1 < out + outlen)
  			MB_CHAR2BYTES(fillchar, p);
  		}
  		else
  		{
  		    // fill by inserting characters
  		    l = (n - l) * MB_CHAR2LEN(fillchar);
  		    mch_memmove(t + l, t, (size_t)(p - t));
  		    if (p + l >= out + outlen)
  			l = (long)((out + outlen) - p - 1);
  		    p += l;
  		    for (n = stl_groupitem[groupdepth] + 1; n < curitem; n++)
  			stl_items[n].stl_start += l;
  		    for ( ; l > 0; l--)
  			MB_CHAR2BYTES(fillchar, t);
  		}
  	    }
  	    continue;
  	}
  	minwid = 0;
  	maxwid = 9999;
  	zeropad = FALSE;
  	l = 1;
  	if (*s == '0')
  	{
  	    s++;
  	    zeropad = TRUE;
  	}
  	if (*s == '-')
  	{
  	    s++;
  	    l = -1;
  	}
  	if (VIM_ISDIGIT(*s))
  	{
  	    minwid = (int)getdigits(&s);
  	    if (minwid < 0)	// overflow
  		minwid = 0;
  	}
  	if (*s == STL_USER_HL)
  	{
  	    stl_items[curitem].stl_type = Highlight;
  	    stl_items[curitem].stl_start = p;
  	    stl_items[curitem].stl_minwid = minwid > 9 ? 1 : minwid;
  	    s++;
  	    curitem++;
  	    continue;
  	}
  	if (*s == STL_TABPAGENR || *s == STL_TABCLOSENR)
  	{
  	    if (*s == STL_TABCLOSENR)
  	    {
  		if (minwid == 0)
  		{
  		    // %X ends the close label, go back to the previously
  		    // define tab label nr.
  		    for (n = curitem - 1; n >= 0; --n)
  			if (stl_items[n].stl_type == TabPage
  					       && stl_items[n].stl_minwid >= 0)
  			{
  			    minwid = stl_items[n].stl_minwid;
  			    break;
  			}
  		}
  		else
  		    // close nrs are stored as negative values
  		    minwid = - minwid;
  	    }
  	    stl_items[curitem].stl_type = TabPage;
  	    stl_items[curitem].stl_start = p;
  	    stl_items[curitem].stl_minwid = minwid;
  	    s++;
  	    curitem++;
  	    continue;
  	}
  	if (*s == '.')
  	{
  	    s++;
  	    if (VIM_ISDIGIT(*s))
  	    {
  		maxwid = (int)getdigits(&s);
  		if (maxwid <= 0)	// overflow
  		    maxwid = 50;
  	    }
  	}
  	minwid = (minwid > 50 ? 50 : minwid) * l;
  	if (*s == '(')
  	{
  	    stl_groupitem[groupdepth++] = curitem;
  	    stl_items[curitem].stl_type = Group;
  	    stl_items[curitem].stl_start = p;
  	    stl_items[curitem].stl_minwid = minwid;
  	    stl_items[curitem].stl_maxwid = maxwid;
  	    s++;
  	    curitem++;
  	    continue;
  	}
  #ifdef FEAT_EVAL
  	// Denotes end of expanded %{} block
  	if (*s == '}' && evaldepth > 0)
  	{
  	    s++;
  	    evaldepth--;
  	    continue;
  	}
  #endif
  	if (vim_strchr(STL_ALL, *s) == NULL)
  	{
  	    s++;
  	    continue;
  	}
  	opt = *s++;
  
  	// OK - now for the real work
  	base = 'D';
  	itemisflag = FALSE;
  	fillable = TRUE;
  	num = -1;
  	str = NULL;
  	switch (opt)
  	{
  	case STL_FILEPATH:
  	case STL_FULLPATH:
  	case STL_FILENAME:
  	    fillable = FALSE;	// don't change ' ' to fillchar
  	    if (buf_spname(wp->w_buffer) != NULL)
  		vim_strncpy(NameBuff, buf_spname(wp->w_buffer), MAXPATHL - 1);
  	    else
  	    {
  		t = (opt == STL_FULLPATH) ? wp->w_buffer->b_ffname
  					  : wp->w_buffer->b_fname;
  		home_replace(wp->w_buffer, t, NameBuff, MAXPATHL, TRUE);
  	    }
  	    trans_characters(NameBuff, MAXPATHL);
  	    if (opt != STL_FILENAME)
  		str = NameBuff;
  	    else
  		str = gettail(NameBuff);
  	    break;
  
  	case STL_VIM_EXPR: // '{'
  	{
  #ifdef FEAT_EVAL
  	    char_u *block_start = s - 1;
  #endif
  	    int reevaluate = (*s == '%');
  
  	    if (reevaluate)
  		s++;
  	    itemisflag = TRUE;
  	    t = p;
  	    while ((*s != '}' || (reevaluate && s[-1] != '%'))
  					  && *s != NUL && p + 1 < out + outlen)
  		*p++ = *s++;
  	    if (*s != '}')	// missing '}' or out of space
  		break;
  	    s++;
  	    if (reevaluate)
  		p[-1] = 0; // remove the % at the end of %{% expr %}
  	    else
  		*p = 0;
  	    p = t;
  #ifdef FEAT_EVAL
  	    vim_snprintf((char *)buf_tmp, sizeof(buf_tmp),
  							 "%d", curbuf->b_fnum);
  	    set_internal_string_var((char_u *)"g:actual_curbuf", buf_tmp);
  	    vim_snprintf((char *)win_tmp, sizeof(win_tmp), "%d", curwin->w_id);
  	    set_internal_string_var((char_u *)"g:actual_curwin", win_tmp);
  
  	    save_curbuf = curbuf;
  	    save_curwin = curwin;
  	    save_VIsual_active = VIsual_active;
  	    curwin = wp;
  	    curbuf = wp->w_buffer;
  	    // Visual mode is only valid in the current window.
  	    if (curwin != save_curwin)
  		VIsual_active = FALSE;
  
  	    str = eval_to_string_safe(p, use_sandbox, FALSE);
  
  	    curwin = save_curwin;
  	    curbuf = save_curbuf;
  	    VIsual_active = save_VIsual_active;
  	    do_unlet((char_u *)"g:actual_curbuf", TRUE);
  	    do_unlet((char_u *)"g:actual_curwin", TRUE);
  
  	    if (str != NULL && *str != 0)
  	    {
  		if (*skipdigits(str) == NUL)
  		{
  		    num = atoi((char *)str);
  		    VIM_CLEAR(str);
  		    itemisflag = FALSE;
  		}
  	    }
  
  	    // If the output of the expression needs to be evaluated
  	    // replace the %{} block with the result of evaluation
  	    if (reevaluate && str != NULL && *str != 0
  		    && strchr((const char *)str, '%') != NULL
  		    && evaldepth < MAX_STL_EVAL_DEPTH)
  	    {
  		size_t parsed_usefmt = (size_t)(block_start - usefmt);
  		size_t str_length = strlen((const char *)str);
  		size_t fmt_length = strlen((const char *)s);
  		size_t new_fmt_len = parsed_usefmt
  						 + str_length + fmt_length + 3;
  		char_u *new_fmt = (char_u *)alloc(new_fmt_len * sizeof(char_u));
  		char_u *new_fmt_p = new_fmt;
  
  		new_fmt_p = (char_u *)memcpy(new_fmt_p, usefmt, parsed_usefmt)
  							       + parsed_usefmt;
  		new_fmt_p = (char_u *)memcpy(new_fmt_p , str, str_length)
  								  + str_length;
  		new_fmt_p = (char_u *)memcpy(new_fmt_p, "%}", 2) + 2;
  		new_fmt_p = (char_u *)memcpy(new_fmt_p , s, fmt_length)
  								  + fmt_length;
  		*new_fmt_p = 0;
  		new_fmt_p = NULL;
  
  		if (usefmt != fmt)
  		    vim_free(usefmt);
  		VIM_CLEAR(str);
  		usefmt = new_fmt;
  		s = usefmt + parsed_usefmt;
  		evaldepth++;
  		continue;
  	    }
  #endif
  	    break;
  	}
  	case STL_LINE:
  	    num = (wp->w_buffer->b_ml.ml_flags & ML_EMPTY)
  		  ? 0L : (long)(wp->w_cursor.lnum);
  	    break;
  
  	case STL_NUMLINES:
  	    num = wp->w_buffer->b_ml.ml_line_count;
  	    break;
  
  	case STL_COLUMN:
  	    num = (State & MODE_INSERT) == 0 && empty_line
  					       ? 0 : (int)wp->w_cursor.col + 1;
  	    break;
  
  	case STL_VIRTCOL:
  	case STL_VIRTCOL_ALT:
  	    virtcol = wp->w_virtcol + 1;
  	    // Don't display %V if it's the same as %c.
  	    if (opt == STL_VIRTCOL_ALT
  		    && (virtcol == (colnr_T)((State & MODE_INSERT) == 0
  			       && empty_line ? 0 : (int)wp->w_cursor.col + 1)))
  		break;
  	    num = (long)virtcol;
  	    break;
  
  	case STL_PERCENTAGE:
  	    num = (int)(((long)wp->w_cursor.lnum * 100L) /
  			(long)wp->w_buffer->b_ml.ml_line_count);
  	    break;
  
  	case STL_ALTPERCENT:
  	    str = buf_tmp;
  	    get_rel_pos(wp, str, TMPLEN);
  	    break;
  
  	case STL_ARGLISTSTAT:
  	    fillable = FALSE;
  	    buf_tmp[0] = 0;
  	    if (append_arg_number(wp, buf_tmp, (int)sizeof(buf_tmp), FALSE))
  		str = buf_tmp;
  	    break;
  
  	case STL_KEYMAP:
  	    fillable = FALSE;
  	    if (get_keymap_str(wp, (char_u *)"<%s>", buf_tmp, TMPLEN))
  		str = buf_tmp;
  	    break;
  	case STL_PAGENUM:
  #if defined(FEAT_PRINTER) || defined(FEAT_GUI_TABLINE)
  	    num = printer_page_num;
  #else
  	    num = 0;
  #endif
  	    break;
  
  	case STL_BUFNO:
  	    num = wp->w_buffer->b_fnum;
  	    break;
  
  	case STL_OFFSET_X:
  	    base = 'X';
  	    // FALLTHROUGH
  	case STL_OFFSET:
  #ifdef FEAT_BYTEOFF
  	    l = ml_find_line_or_offset(wp->w_buffer, wp->w_cursor.lnum, NULL);
  	    num = (wp->w_buffer->b_ml.ml_flags & ML_EMPTY) || l < 0
  		       ? 0L : l + 1 + ((State & MODE_INSERT) == 0 && empty_line
  				? 0 : (int)wp->w_cursor.col);
  #endif
  	    break;
  
  	case STL_BYTEVAL_X:
  	    base = 'X';
  	    // FALLTHROUGH
  	case STL_BYTEVAL:
  	    num = byteval;
  	    if (num == NL)
  		num = 0;
  	    else if (num == CAR && get_fileformat(wp->w_buffer) == EOL_MAC)
  		num = NL;
  	    break;
  
  	case STL_ROFLAG:
  	case STL_ROFLAG_ALT:
  	    itemisflag = TRUE;
  	    if (wp->w_buffer->b_p_ro)
  		str = (char_u *)((opt == STL_ROFLAG_ALT) ? ",RO" : _("[RO]"));
  	    break;
  
  	case STL_HELPFLAG:
  	case STL_HELPFLAG_ALT:
  	    itemisflag = TRUE;
  	    if (wp->w_buffer->b_help)
  		str = (char_u *)((opt == STL_HELPFLAG_ALT) ? ",HLP"
  							       : _("[Help]"));
  	    break;
  
  	case STL_FILETYPE:
  	    if (*wp->w_buffer->b_p_ft != NUL
  		    && STRLEN(wp->w_buffer->b_p_ft) < TMPLEN - 3)
  	    {
  		vim_snprintf((char *)buf_tmp, sizeof(buf_tmp), "[%s]",
  							wp->w_buffer->b_p_ft);
  		str = buf_tmp;
  	    }
  	    break;
  
  	case STL_FILETYPE_ALT:
  	    itemisflag = TRUE;
  	    if (*wp->w_buffer->b_p_ft != NUL
  		    && STRLEN(wp->w_buffer->b_p_ft) < TMPLEN - 2)
  	    {
  		vim_snprintf((char *)buf_tmp, sizeof(buf_tmp), ",%s",
  							wp->w_buffer->b_p_ft);
  		for (t = buf_tmp; *t != 0; t++)
  		    *t = TOUPPER_LOC(*t);
  		str = buf_tmp;
  	    }
  	    break;
  
  #if defined(FEAT_QUICKFIX)
  	case STL_PREVIEWFLAG:
  	case STL_PREVIEWFLAG_ALT:
  	    itemisflag = TRUE;
  	    if (wp->w_p_pvw)
  		str = (char_u *)((opt == STL_PREVIEWFLAG_ALT) ? ",PRV"
  							    : _("[Preview]"));
  	    break;
  
  	case STL_QUICKFIX:
  	    if (bt_quickfix(wp->w_buffer))
  		str = (char_u *)(wp->w_llist_ref
  			    ? _(msg_loclist)
  			    : _(msg_qflist));
  	    break;
  #endif
  
  	case STL_MODIFIED:
  	case STL_MODIFIED_ALT:
  	    itemisflag = TRUE;
  	    switch ((opt == STL_MODIFIED_ALT)
  		    + bufIsChanged(wp->w_buffer) * 2
  		    + (!wp->w_buffer->b_p_ma) * 4)
  	    {
  		case 2: str = (char_u *)"[+]"; break;
  		case 3: str = (char_u *)",+"; break;
  		case 4: str = (char_u *)"[-]"; break;
  		case 5: str = (char_u *)",-"; break;
  		case 6: str = (char_u *)"[+-]"; break;
  		case 7: str = (char_u *)",+-"; break;
  	    }
  	    break;
  
  	case STL_HIGHLIGHT:
  	    t = s;
  	    while (*s != '#' && *s != NUL)
  		++s;
  	    if (*s == '#')
  	    {
  		stl_items[curitem].stl_type = Highlight;
  		stl_items[curitem].stl_start = p;
  		stl_items[curitem].stl_minwid = -syn_namen2id(t, (int)(s - t));
  		curitem++;
  	    }
  	    if (*s != NUL)
  		++s;
  	    continue;
  	}
  
  	stl_items[curitem].stl_start = p;
  	stl_items[curitem].stl_type = Normal;
  	if (str != NULL && *str)
  	{
  	    t = str;
  	    if (itemisflag)
  	    {
  		if ((t[0] && t[1])
  			&& ((!prevchar_isitem && *t == ',')
  			      || (prevchar_isflag && *t == ' ')))
  		    t++;
  		prevchar_isflag = TRUE;
  	    }
  	    l = vim_strsize(t);
  	    if (l > 0)
  		prevchar_isitem = TRUE;
  	    if (l > maxwid)
  	    {
  		while (l >= maxwid)
  		    if (has_mbyte)
  		    {
  			l -= ptr2cells(t);
  			t += (*mb_ptr2len)(t);
  		    }
  		    else
  			l -= byte2cells(*t++);
  		if (p + 1 >= out + outlen)
  		    break;
  		*p++ = '<';
  	    }
  	    if (minwid > 0)
  	    {
  		for (; l < minwid && p + 1 < out + outlen; l++)
  		{
  		    // Don't put a "-" in front of a digit.
  		    if (l + 1 == minwid && fillchar == '-' && VIM_ISDIGIT(*t))
  			*p++ = ' ';
  		    else
  			MB_CHAR2BYTES(fillchar, p);
  		}
  		minwid = 0;
  	    }
  	    else
  		minwid *= -1;
  	    for (; *t && p + 1 < out + outlen; t++)
  	    {
  		// Change a space by fillchar, unless fillchar is '-' and a
  		// digit follows.
  		if (fillable && *t == ' '
  				&& (!VIM_ISDIGIT(*(t + 1)) || fillchar != '-'))
  		    MB_CHAR2BYTES(fillchar, p);
  		else
  		    *p++ = *t;
  	    }
  	    for (; l < minwid && p + 1 < out + outlen; l++)
  		MB_CHAR2BYTES(fillchar, p);
  	}
  	else if (num >= 0)
  	{
  	    int nbase = (base == 'D' ? 10 : (base == 'O' ? 8 : 16));
  	    char_u nstr[20];
  
  	    if (p + 20 >= out + outlen)
  		break;		// not sufficient space
  	    prevchar_isitem = TRUE;
  	    t = nstr;
  	    if (opt == STL_VIRTCOL_ALT)
  	    {
  		*t++ = '-';
  		minwid--;
  	    }
  	    *t++ = '%';
  	    if (zeropad)
  		*t++ = '0';
  	    *t++ = '*';
  	    *t++ = nbase == 16 ? base : (char_u)(nbase == 8 ? 'o' : 'd');
  	    *t = 0;
  
  	    for (n = num, l = 1; n >= nbase; n /= nbase)
  		l++;
  	    if (opt == STL_VIRTCOL_ALT)
  		l++;
  	    if (l > maxwid)
  	    {
  		l += 2;
  		n = l - maxwid;
  		while (l-- > maxwid)
  		    num /= nbase;
  		*t++ = '>';
  		*t++ = '%';
  		*t = t[-3];
  		*++t = 0;
  		vim_snprintf((char *)p, outlen - (p - out), (char *)nstr,
  								   0, num, n);
  	    }
  	    else
  		vim_snprintf((char *)p, outlen - (p - out), (char *)nstr,
  								 minwid, num);
  	    p += STRLEN(p);
  	}
  	else
  	    stl_items[curitem].stl_type = Empty;
  
  	if (opt == STL_VIM_EXPR)
  	    vim_free(str);
  
  	if (num >= 0 || (!itemisflag && str && *str))
  	    prevchar_isflag = FALSE;	    // Item not NULL, but not a flag
  	curitem++;
      }
      *p = NUL;
      itemcnt = curitem;
  
  #ifdef FEAT_EVAL
      if (usefmt != fmt)
  	vim_free(usefmt);
  #endif
  
      width = vim_strsize(out);
      if (maxwidth > 0 && width > maxwidth)
      {
  	// Result is too long, must truncate somewhere.
  	l = 0;
  	if (itemcnt == 0)
  	    s = out;
  	else
  	{
  	    for ( ; l < itemcnt; l++)
  		if (stl_items[l].stl_type == Trunc)
  		{
  		    // Truncate at %< item.
  		    s = stl_items[l].stl_start;
  		    break;
  		}
  	    if (l == itemcnt)
  	    {
  		// No %< item, truncate first item.
  		s = stl_items[0].stl_start;
  		l = 0;
  	    }
  	}
  
  	if (width - vim_strsize(s) >= maxwidth)
  	{
  	    // Truncation mark is beyond max length
  	    if (has_mbyte)
  	    {
  		s = out;
  		width = 0;
  		for (;;)
  		{
  		    width += ptr2cells(s);
  		    if (width >= maxwidth)
  			break;
  		    s += (*mb_ptr2len)(s);
  		}
  		// Fill up for half a double-wide character.
  		while (++width < maxwidth)
  		    MB_CHAR2BYTES(fillchar, s);
  	    }
  	    else
  		s = out + maxwidth - 1;
  	    for (l = 0; l < itemcnt; l++)
  		if (stl_items[l].stl_start > s)
  		    break;
  	    itemcnt = l;
  	    *s++ = '>';
  	    *s = 0;
  	}
  	else
  	{
  	    if (has_mbyte)
  	    {
  		n = 0;
  		while (width >= maxwidth)
  		{
  		    width -= ptr2cells(s + n);
  		    n += (*mb_ptr2len)(s + n);
  		}
  	    }
  	    else
  		n = width - maxwidth + 1;
  	    p = s + n;
  	    STRMOVE(s + 1, p);
  	    *s = '<';
  
  	    // Fill up for half a double-wide character.
  	    while (++width < maxwidth)
  	    {
  		s = s + STRLEN(s);
  		MB_CHAR2BYTES(fillchar, s);
  		*s = NUL;
  	    }
  
  	    --n;	// count the '<'
  	    for (; l < itemcnt; l++)
  	    {
  		if (stl_items[l].stl_start - n >= s)
  		    stl_items[l].stl_start -= n;
  		else
  		    stl_items[l].stl_start = s;
  	    }
  	}
  	width = maxwidth;
      }
      else if (width < maxwidth && STRLEN(out) + maxwidth - width + 1 < outlen)
      {
  	// Apply STL_MIDDLE if any
  	for (l = 0; l < itemcnt; l++)
  	    if (stl_items[l].stl_type == Middle)
  		break;
  	if (l < itemcnt)
  	{
  	    int middlelength = (maxwidth - width) * MB_CHAR2LEN(fillchar);
  	    p = stl_items[l].stl_start + middlelength;
  	    STRMOVE(p, stl_items[l].stl_start);
  	    for (s = stl_items[l].stl_start; s < p;)
  		MB_CHAR2BYTES(fillchar, s);
  	    for (l++; l < itemcnt; l++)
  		stl_items[l].stl_start += middlelength;
  	    width = maxwidth;
  	}
      }
  
      // Store the info about highlighting.
      if (hltab != NULL)
      {
  	*hltab = stl_hltab;
  	sp = stl_hltab;
  	for (l = 0; l < itemcnt; l++)
  	{
  	    if (stl_items[l].stl_type == Highlight)
  	    {
  		sp->start = stl_items[l].stl_start;
  		sp->userhl = stl_items[l].stl_minwid;
  		sp++;
  	    }
  	}
  	sp->start = NULL;
  	sp->userhl = 0;
      }
  
      // Store the info about tab pages labels.
      if (tabtab != NULL)
      {
  	*tabtab = stl_tabtab;
  	sp = stl_tabtab;
  	for (l = 0; l < itemcnt; l++)
  	{
  	    if (stl_items[l].stl_type == TabPage)
  	    {
  		sp->start = stl_items[l].stl_start;
  		sp->userhl = stl_items[l].stl_minwid;
  		sp++;
  	    }
  	}
  	sp->start = NULL;
  	sp->userhl = 0;
      }
  
      // When inside update_screen we do not want redrawing a statusline, ruler,
      // title, etc. to trigger another redraw, it may cause an endless loop.
      if (updating_screen)
      {
  	must_redraw = save_must_redraw;
  	curwin->w_redr_type = save_redr_type;
      }
  
      // A user function may reset KeyTyped, restore it.
      KeyTyped = save_KeyTyped;
  
      return width;
  }
  #endif // FEAT_STL_OPT
  
  #if defined(FEAT_STL_OPT) || defined(FEAT_CMDL_INFO) \
  	    || defined(FEAT_GUI_TABLINE) || defined(PROTO)
  /*
   * Get relative cursor position in window into "buf[buflen]", in the form 99%,
   * using "Top", "Bot" or "All" when appropriate.
   */
      void
  get_rel_pos(
      win_T	*wp,
      char_u	*buf,
      int		buflen)
  {
      long	above; // number of lines above window
      long	below; // number of lines below window
  
      if (buflen < 3) // need at least 3 chars for writing
  	return;
      above = wp->w_topline - 1;
  #ifdef FEAT_DIFF
      above += diff_check_fill(wp, wp->w_topline) - wp->w_topfill;
      if (wp->w_topline == 1 && wp->w_topfill >= 1)
  	above = 0;  // All buffer lines are displayed and there is an
  		    // indication of filler lines, that can be considered
  		    // seeing all lines.
  #endif
      below = wp->w_buffer->b_ml.ml_line_count - wp->w_botline + 1;
      if (below <= 0)
  	vim_strncpy(buf, (char_u *)(above == 0 ? _("All") : _("Bot")),
  							(size_t)(buflen - 1));
      else if (above <= 0)
  	vim_strncpy(buf, (char_u *)_("Top"), (size_t)(buflen - 1));
      else
  	vim_snprintf((char *)buf, (size_t)buflen, "%2d%%", above > 1000000L
  				    ? (int)(above / ((above + below) / 100L))
  				    : (int)(above * 100L / (above + below)));
  }
  #endif
  
  /*
   * Append (file 2 of 8) to "buf[buflen]", if editing more than one file.
   * Return TRUE if it was appended.
   */
      static int
  append_arg_number(
      win_T	*wp,
      char_u	*buf,
      int		buflen,
      int		add_file)	// Add "file" before the arg number
  {
      char_u	*p;
  
      if (ARGCOUNT <= 1)		// nothing to do
  	return FALSE;
  
      p = buf + STRLEN(buf);	// go to the end of the buffer
      if (p - buf + 35 >= buflen)	// getting too long
  	return FALSE;
      *p++ = ' ';
      *p++ = '(';
      if (add_file)
      {
  	STRCPY(p, "file ");
  	p += 5;
      }
      vim_snprintf((char *)p, (size_t)(buflen - (p - buf)),
  		wp->w_arg_idx_invalid ? "(%d) of %d)"
  				  : "%d of %d)", wp->w_arg_idx + 1, ARGCOUNT);
      return TRUE;
  }
  
  /*
   * If fname is not a full path, make it a full path.
   * Returns pointer to allocated memory (NULL for failure).
   */
      char_u  *
  fix_fname(char_u  *fname)
  {
      /*
       * Force expanding the path always for Unix, because symbolic links may
       * mess up the full path name, even though it starts with a '/'.
       * Also expand when there is ".." in the file name, try to remove it,
       * because "c:/src/../README" is equal to "c:/README".
       * Similarly "c:/src//file" is equal to "c:/src/file".
       * For MS-Windows also expand names like "longna~1" to "longname".
       */
  #ifdef UNIX
      return FullName_save(fname, TRUE);
  #else
      if (!vim_isAbsName(fname)
  	    || strstr((char *)fname, "..") != NULL
  	    || strstr((char *)fname, "//") != NULL
  # ifdef BACKSLASH_IN_FILENAME
  	    || strstr((char *)fname, "\\\\") != NULL
  # endif
  # if defined(MSWIN)
  	    || vim_strchr(fname, '~') != NULL
  # endif
  	    )
  	return FullName_save(fname, FALSE);
  
      fname = vim_strsave(fname);
  
  # ifdef USE_FNAME_CASE
      if (fname != NULL)
  	fname_case(fname, 0);	// set correct case for file name
  # endif
  
      return fname;
  #endif
  }
  
  /*
   * Make "*ffname" a full file name, set "*sfname" to "*ffname" if not NULL.
   * "*ffname" becomes a pointer to allocated memory (or NULL).
   * When resolving a link both "*sfname" and "*ffname" will point to the same
   * allocated memory.
   * The "*ffname" and "*sfname" pointer values on call will not be freed.
   * Note that the resulting "*ffname" pointer should be considered not allocated.
   */
      void
  fname_expand(
      buf_T	*buf UNUSED,
      char_u	**ffname,
      char_u	**sfname)
  {
      if (*ffname == NULL)	    // no file name given, nothing to do
  	return;
      if (*sfname == NULL)	    // no short file name given, use ffname
  	*sfname = *ffname;
      *ffname = fix_fname(*ffname);   // expand to full path
  
  #ifdef FEAT_SHORTCUT
      if (!buf->b_p_bin)
      {
  	char_u  *rfname;
  
  	// If the file name is a shortcut file, use the file it links to.
  	rfname = mch_resolve_path(*ffname, FALSE);
  	if (rfname != NULL)
  	{
  	    vim_free(*ffname);
  	    *ffname = rfname;
  	    *sfname = rfname;
  	}
      }
  #endif
  }
  
  /*
   * Open a window for a number of buffers.
   */
      void
  ex_buffer_all(exarg_T *eap)
  {
      buf_T	*buf;
      win_T	*wp, *wpnext;
      int		split_ret = OK;
      int		p_ea_save;
      int		open_wins = 0;
      int		r;
      int		count;		// Maximum number of windows to open.
      int		all;		// When TRUE also load inactive buffers.
      int		had_tab = cmdmod.cmod_tab;
      tabpage_T	*tpnext;
  
      if (eap->addr_count == 0)	// make as many windows as possible
  	count = 9999;
      else
  	count = eap->line2;	// make as many windows as specified
      if (eap->cmdidx == CMD_unhide || eap->cmdidx == CMD_sunhide)
  	all = FALSE;
      else
  	all = TRUE;
  
      setpcmark();
  
  #ifdef FEAT_GUI
      need_mouse_correct = TRUE;
  #endif
  
      /*
       * Close superfluous windows (two windows for the same buffer).
       * Also close windows that are not full-width.
       */
      if (had_tab > 0)
  	goto_tabpage_tp(first_tabpage, TRUE, TRUE);
      for (;;)
      {
  	tpnext = curtab->tp_next;
  	for (wp = firstwin; wp != NULL; wp = wpnext)
  	{
  	    wpnext = wp->w_next;
  	    if ((wp->w_buffer->b_nwindows > 1
  			|| ((cmdmod.cmod_split & WSP_VERT)
  			    ? wp->w_height + wp->w_status_height < Rows - p_ch
  							     - tabline_height()
  			    : wp->w_width != Columns)
  			|| (had_tab > 0 && wp != firstwin))
  		    && !ONE_WINDOW
  		    && !(wp->w_closing || wp->w_buffer->b_locked > 0)
  		    && !win_unlisted(wp))
  	    {
  		if (win_close(wp, FALSE) == FAIL)
  		    break;
  		// Just in case an autocommand does something strange with
  		// windows: start all over...
  		wpnext = firstwin;
  		tpnext = first_tabpage;
  		open_wins = 0;
  	    }
  	    else
  		++open_wins;
  	}
  
  	// Without the ":tab" modifier only do the current tab page.
  	if (had_tab == 0 || tpnext == NULL)
  	    break;
  	goto_tabpage_tp(tpnext, TRUE, TRUE);
      }
  
      /*
       * Go through the buffer list.  When a buffer doesn't have a window yet,
       * open one.  Otherwise move the window to the right position.
       * Watch out for autocommands that delete buffers or windows!
       */
      // Don't execute Win/Buf Enter/Leave autocommands here.
      ++autocmd_no_enter;
      win_enter(lastwin, FALSE);
      ++autocmd_no_leave;
      for (buf = firstbuf; buf != NULL && open_wins < count; buf = buf->b_next)
      {
  	// Check if this buffer needs a window
  	if ((!all && buf->b_ml.ml_mfp == NULL) || !buf->b_p_bl)
  	    continue;
  
  	if (had_tab != 0)
  	{
  	    // With the ":tab" modifier don't move the window.
  	    if (buf->b_nwindows > 0)
  		wp = lastwin;	    // buffer has a window, skip it
  	    else
  		wp = NULL;
  	}
  	else
  	{
  	    // Check if this buffer already has a window
  	    FOR_ALL_WINDOWS(wp)
  		if (wp->w_buffer == buf)
  		    break;
  	    // If the buffer already has a window, move it
  	    if (wp != NULL)
  		win_move_after(wp, curwin);
  	}
  
  	if (wp == NULL && split_ret == OK)
  	{
  	    bufref_T	bufref;
  
  	    set_bufref(&bufref, buf);
  
  	    // Split the window and put the buffer in it
  	    p_ea_save = p_ea;
  	    p_ea = TRUE;		// use space from all windows
  	    split_ret = win_split(0, WSP_ROOM | WSP_BELOW);
  	    ++open_wins;
  	    p_ea = p_ea_save;
  	    if (split_ret == FAIL)
  		continue;
  
  	    // Open the buffer in this window.
  	    swap_exists_action = SEA_DIALOG;
  	    set_curbuf(buf, DOBUF_GOTO);
  	    if (!bufref_valid(&bufref))
  	    {
  		// autocommands deleted the buffer!!!
  		swap_exists_action = SEA_NONE;
  		break;
  	    }
  	    if (swap_exists_action == SEA_QUIT)
  	    {
  #if defined(FEAT_EVAL)
  		cleanup_T   cs;
  
  		// Reset the error/interrupt/exception state here so that
  		// aborting() returns FALSE when closing a window.
  		enter_cleanup(&cs);
  #endif
  
  		// User selected Quit at ATTENTION prompt; close this window.
  		win_close(curwin, TRUE);
  		--open_wins;
  		swap_exists_action = SEA_NONE;
  		swap_exists_did_quit = TRUE;
  
  #if defined(FEAT_EVAL)
  		// Restore the error/interrupt/exception state if not
  		// discarded by a new aborting error, interrupt, or uncaught
  		// exception.
  		leave_cleanup(&cs);
  #endif
  	    }
  	    else
  		handle_swap_exists(NULL);
  	}
  
  	ui_breakcheck();
  	if (got_int)
  	{
  	    (void)vgetc();	// only break the file loading, not the rest
  	    break;
  	}
  #ifdef FEAT_EVAL
  	// Autocommands deleted the buffer or aborted script processing!!!
  	if (aborting())
  	    break;
  #endif
  	// When ":tab" was used open a new tab for a new window repeatedly.
  	if (had_tab > 0 && tabpage_index(NULL) <= p_tpm)
  	    cmdmod.cmod_tab = 9999;
      }
      --autocmd_no_enter;
      win_enter(firstwin, FALSE);		// back to first window
      --autocmd_no_leave;
  
      /*
       * Close superfluous windows.
       */
      for (wp = lastwin; open_wins > count; )
      {
  	r = (buf_hide(wp->w_buffer) || !bufIsChanged(wp->w_buffer)
  				     || autowrite(wp->w_buffer, FALSE) == OK);
  	if (!win_valid(wp))
  	{
  	    // BufWrite Autocommands made the window invalid, start over
  	    wp = lastwin;
  	}
  	else if (r)
  	{
  	    win_close(wp, !buf_hide(wp->w_buffer));
  	    --open_wins;
  	    wp = lastwin;
  	}
  	else
  	{
  	    wp = wp->w_prev;
  	    if (wp == NULL)
  		break;
  	}
      }
  }
  
  
  static int  chk_modeline(linenr_T, int);
  
  /*
   * do_modelines() - process mode lines for the current file
   *
   * "flags" can be:
   * OPT_WINONLY	    only set options local to window
   * OPT_NOWIN	    don't set options local to window
   *
   * Returns immediately if the "ml" option isn't set.
   */
      void
  do_modelines(int flags)
  {
      linenr_T	lnum;
      int		nmlines;
      static int	entered = 0;
  
      if (!curbuf->b_p_ml || (nmlines = (int)p_mls) == 0)
  	return;
  
      // Disallow recursive entry here.  Can happen when executing a modeline
      // triggers an autocommand, which reloads modelines with a ":do".
      if (entered)
  	return;
  
      ++entered;
      for (lnum = 1; curbuf->b_p_ml && lnum <= curbuf->b_ml.ml_line_count && lnum <= nmlines;
  								       ++lnum)
  	if (chk_modeline(lnum, flags) == FAIL)
  	    nmlines = 0;
  
      for (lnum = curbuf->b_ml.ml_line_count; curbuf->b_p_ml && lnum > 0 && lnum > nmlines
  		       && lnum > curbuf->b_ml.ml_line_count - nmlines; --lnum)
  	if (chk_modeline(lnum, flags) == FAIL)
  	    nmlines = 0;
      --entered;
  }
  
  #include "version.h"		// for version number
  
  /*
   * chk_modeline() - check a single line for a mode string
   * Return FAIL if an error encountered.
   */
      static int
  chk_modeline(
      linenr_T	lnum,
      int		flags)		// Same as for do_modelines().
  {
      char_u	*s;
      char_u	*e;
      char_u	*linecopy;		// local copy of any modeline found
      int		prev;
      int		vers;
      int		end;
      int		retval = OK;
      sctx_T	save_current_sctx;
  
      ESTACK_CHECK_DECLARATION
  
      prev = -1;
      for (s = ml_get(lnum); *s != NUL; ++s)
      {
  	if (prev == -1 || vim_isspace(prev))
  	{
  	    if ((prev != -1 && STRNCMP(s, "ex:", (size_t)3) == 0)
  		    || STRNCMP(s, "vi:", (size_t)3) == 0)
  		break;
  	    // Accept both "vim" and "Vim".
  	    if ((s[0] == 'v' || s[0] == 'V') && s[1] == 'i' && s[2] == 'm')
  	    {
  		if (s[3] == '<' || s[3] == '=' || s[3] == '>')
  		    e = s + 4;
  		else
  		    e = s + 3;
  		vers = getdigits(&e);
  		if (*e == ':'
  			&& (s[0] != 'V'
  				  || STRNCMP(skipwhite(e + 1), "set", 3) == 0)
  			&& (s[3] == ':'
  			    || (VIM_VERSION_100 >= vers && isdigit(s[3]))
  			    || (VIM_VERSION_100 < vers && s[3] == '<')
  			    || (VIM_VERSION_100 > vers && s[3] == '>')
  			    || (VIM_VERSION_100 == vers && s[3] == '=')))
  		    break;
  	    }
  	}
  	prev = *s;
      }
  
      if (*s)
      {
  	do				// skip over "ex:", "vi:" or "vim:"
  	    ++s;
  	while (s[-1] != ':');
  
  	s = linecopy = vim_strsave(s);	// copy the line, it will change
  	if (linecopy == NULL)
  	    return FAIL;
  
  	// prepare for emsg()
  	estack_push(ETYPE_MODELINE, (char_u *)"modelines", lnum);
  	ESTACK_CHECK_SETUP
  
  	end = FALSE;
  	while (end == FALSE)
  	{
  	    s = skipwhite(s);
  	    if (*s == NUL)
  		break;
  
  	    /*
  	     * Find end of set command: ':' or end of line.
  	     * Skip over "\:", replacing it with ":".
  	     */
  	    for (e = s; *e != ':' && *e != NUL; ++e)
  		if (e[0] == '\\' && e[1] == ':')
  		    STRMOVE(e, e + 1);
  	    if (*e == NUL)
  		end = TRUE;
  
  	    /*
  	     * If there is a "set" command, require a terminating ':' and
  	     * ignore the stuff after the ':'.
  	     * "vi:set opt opt opt: foo" -- foo not interpreted
  	     * "vi:opt opt opt: foo" -- foo interpreted
  	     * Accept "se" for compatibility with Elvis.
  	     */
  	    if (STRNCMP(s, "set ", (size_t)4) == 0
  		    || STRNCMP(s, "se ", (size_t)3) == 0)
  	    {
  		if (*e != ':')		// no terminating ':'?
  		    break;
  		end = TRUE;
  		s = vim_strchr(s, ' ') + 1;
  	    }
  	    *e = NUL;			// truncate the set command
  
  	    if (*s != NUL)		// skip over an empty "::"
  	    {
  		int secure_save = secure;
  
  		save_current_sctx = current_sctx;
  		current_sctx.sc_version = 1;
  #ifdef FEAT_EVAL
  		current_sctx.sc_sid = SID_MODELINE;
  		current_sctx.sc_seq = 0;
  		current_sctx.sc_lnum = lnum;
  #endif
  
  		// Make sure no risky things are executed as a side effect.
  		secure = 1;
  
  		retval = do_set(s, OPT_MODELINE | OPT_LOCAL | flags);
  
  		secure = secure_save;
  		current_sctx = save_current_sctx;
  		if (retval == FAIL)		// stop if error found
  		    break;
  	    }
  	    s = e + 1;			// advance to next part
  	}
  
  	ESTACK_CHECK_NOW
  	estack_pop();
  	vim_free(linecopy);
      }
      return retval;
  }
  
  /*
   * Return TRUE if "buf" is a normal buffer, 'buftype' is empty.
   */
      int
  bt_normal(buf_T *buf)
  {
      return buf != NULL && buf->b_p_bt[0] == NUL;
  }
  
  #if defined(FEAT_QUICKFIX) || defined(PROTO)
  /*
   * Return TRUE if "buf" is the quickfix buffer.
   */
      int
  bt_quickfix(buf_T *buf)
  {
      return buf != NULL && buf->b_p_bt[0] == 'q';
  }
  #endif
  
  #if defined(FEAT_TERMINAL) || defined(PROTO)
  /*
   * Return TRUE if "buf" is a terminal buffer.
   */
      int
  bt_terminal(buf_T *buf)
  {
      return buf != NULL && buf->b_p_bt[0] == 't';
  }
  #endif
  
  /*
   * Return TRUE if "buf" is a help buffer.
   */
      int
  bt_help(buf_T *buf)
  {
      return buf != NULL && buf->b_help;
  }
  
  /*
   * Return TRUE if "buf" is a prompt buffer.
   */
      int
  bt_prompt(buf_T *buf)
  {
      return buf != NULL && buf->b_p_bt[0] == 'p' && buf->b_p_bt[1] == 'r';
  }
  
  #if defined(FEAT_PROP_POPUP) || defined(PROTO)
  /*
   * Return TRUE if "buf" is a buffer for a popup window.
   */
      int
  bt_popup(buf_T *buf)
  {
      return buf != NULL && buf->b_p_bt != NULL
  	&& buf->b_p_bt[0] == 'p' && buf->b_p_bt[1] == 'o';
  }
  #endif
  
  /*
   * Return TRUE if "buf" is a "nofile", "acwrite", "terminal" or "prompt"
   * buffer.  This means the buffer name is not a file name.
   */
      int
  bt_nofilename(buf_T *buf)
  {
      return buf != NULL && ((buf->b_p_bt[0] == 'n' && buf->b_p_bt[2] == 'f')
  	    || buf->b_p_bt[0] == 'a'
  	    || buf->b_p_bt[0] == 't'
  	    || buf->b_p_bt[0] == 'p');
  }
  
  #if defined(FEAT_QUICKFIX) || defined(PROTO)
  /*
   * Return TRUE if "buf" has 'buftype' set to "nofile".
   */
      int
  bt_nofile(buf_T *buf)
  {
      return buf != NULL && buf->b_p_bt[0] == 'n' && buf->b_p_bt[2] == 'f';
  }
  #endif
  
  /*
   * Return TRUE if "buf" is a "nowrite", "nofile", "terminal" or "prompt"
   * buffer.
   */
      int
  bt_dontwrite(buf_T *buf)
  {
      return buf != NULL && (buf->b_p_bt[0] == 'n'
  		 || buf->b_p_bt[0] == 't'
  		 || buf->b_p_bt[0] == 'p');
  }
  
  #if defined(FEAT_QUICKFIX) || defined(PROTO)
      int
  bt_dontwrite_msg(buf_T *buf)
  {
      if (bt_dontwrite(buf))
      {
  	emsg(_(e_cannot_write_buftype_option_is_set));
  	return TRUE;
      }
      return FALSE;
  }
  #endif
  
  /*
   * Return TRUE if the buffer should be hidden, according to 'hidden', ":hide"
   * and 'bufhidden'.
   */
      int
  buf_hide(buf_T *buf)
  {
      // 'bufhidden' overrules 'hidden' and ":hide", check it first
      switch (buf->b_p_bh[0])
      {
  	case 'u':		    // "unload"
  	case 'w':		    // "wipe"
  	case 'd': return FALSE;	    // "delete"
  	case 'h': return TRUE;	    // "hide"
      }
      return (p_hid || (cmdmod.cmod_flags & CMOD_HIDE));
  }
  
  /*
   * Return special buffer name.
   * Returns NULL when the buffer has a normal file name.
   */
      char_u *
  buf_spname(buf_T *buf)
  {
  #if defined(FEAT_QUICKFIX)
      if (bt_quickfix(buf))
      {
  	/*
  	 * Differentiate between the quickfix and location list buffers using
  	 * the buffer number stored in the global quickfix stack.
  	 */
  	if (buf->b_fnum == qf_stack_get_bufnr())
  	    return (char_u *)_(msg_qflist);
  	else
  	    return (char_u *)_(msg_loclist);
      }
  #endif
  
      // There is no _file_ when 'buftype' is "nofile", b_sfname
      // contains the name as specified by the user.
      if (bt_nofilename(buf))
      {
  #ifdef FEAT_TERMINAL
  	if (buf->b_term != NULL)
  	    return term_get_status_text(buf->b_term);
  #endif
  	if (buf->b_fname != NULL)
  	    return buf->b_fname;
  #ifdef FEAT_JOB_CHANNEL
  	if (bt_prompt(buf))
  	    return (char_u *)_("[Prompt]");
  #endif
  #ifdef FEAT_PROP_POPUP
  	if (bt_popup(buf))
  	    return (char_u *)_("[Popup]");
  #endif
  	return (char_u *)_("[Scratch]");
      }
  
      if (buf->b_fname == NULL)
  	return buf_get_fname(buf);
      return NULL;
  }
  
  /*
   * Get "buf->b_fname", use "[No Name]" if it is NULL.
   */
      char_u *
  buf_get_fname(buf_T *buf)
  {
      if (buf->b_fname == NULL)
  	return (char_u *)_("[No Name]");
      return buf->b_fname;
  }
  
  /*
   * Set 'buflisted' for curbuf to "on" and trigger autocommands if it changed.
   */
      void
  set_buflisted(int on)
  {
      if (on != curbuf->b_p_bl)
      {
  	curbuf->b_p_bl = on;
  	if (on)
  	    apply_autocmds(EVENT_BUFADD, NULL, NULL, FALSE, curbuf);
  	else
  	    apply_autocmds(EVENT_BUFDELETE, NULL, NULL, FALSE, curbuf);
      }
  }
  
  /*
   * Read the file for "buf" again and check if the contents changed.
   * Return TRUE if it changed or this could not be checked.
   */
      int
  buf_contents_changed(buf_T *buf)
  {
      buf_T	*newbuf;
      int		differ = TRUE;
      linenr_T	lnum;
      aco_save_T	aco;
      exarg_T	ea;
  
      // Allocate a buffer without putting it in the buffer list.
      newbuf = buflist_new(NULL, NULL, (linenr_T)1, BLN_DUMMY);
      if (newbuf == NULL)
  	return TRUE;
  
      // Force the 'fileencoding' and 'fileformat' to be equal.
      if (prep_exarg(&ea, buf) == FAIL)
      {
  	wipe_buffer(newbuf, FALSE);
  	return TRUE;
      }
  
      // set curwin/curbuf to buf and save a few things
      aucmd_prepbuf(&aco, newbuf);
  
      if (ml_open(curbuf) == OK
  	    && readfile(buf->b_ffname, buf->b_fname,
  				  (linenr_T)0, (linenr_T)0, (linenr_T)MAXLNUM,
  					    &ea, READ_NEW | READ_DUMMY) == OK)
      {
  	// compare the two files line by line
  	if (buf->b_ml.ml_line_count == curbuf->b_ml.ml_line_count)
  	{
  	    differ = FALSE;
  	    for (lnum = 1; lnum <= curbuf->b_ml.ml_line_count; ++lnum)
  		if (STRCMP(ml_get_buf(buf, lnum, FALSE), ml_get(lnum)) != 0)
  		{
  		    differ = TRUE;
  		    break;
  		}
  	}
      }
      vim_free(ea.cmd);
  
      // restore curwin/curbuf and a few other things
      aucmd_restbuf(&aco);
  
      if (curbuf != newbuf)	// safety check
  	wipe_buffer(newbuf, FALSE);
  
      return differ;
  }
  
  /*
   * Wipe out a buffer and decrement the last buffer number if it was used for
   * this buffer.  Call this to wipe out a temp buffer that does not contain any
   * marks.
   */
      void
  wipe_buffer(
      buf_T	*buf,
      int		aucmd)	    // When TRUE trigger autocommands.
  {
      if (buf->b_fnum == top_file_num - 1)
  	--top_file_num;
  
      if (!aucmd)		    // Don't trigger BufDelete autocommands here.
  	block_autocmds();
  
      close_buffer(NULL, buf, DOBUF_WIPE, FALSE, TRUE);
  
      if (!aucmd)
  	unblock_autocmds();
  }
  