Import vim from changeset v5628:c9cad40b4181

- Cleanup source tree, leaving only files necessary for compilation/testing
- Process files through unifdef to remove tons of FEAT_* macros
- Process files through uncrustify to normalize source code formatting.
- Port the build system to cmake

1 files changed, 4517 insertions, 0 deletions

diff --git a/src/buffer.c b/src/buffer.c
new file mode 100644
index 0000000000..bffae5388d
--- /dev/null
+++ b/src/buffer.c
@@ -0,0 +1,4517 @@
+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * 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"
+
+static char_u   *buflist_match __ARGS((regprog_T *prog, buf_T *buf));
+# define HAVE_BUFLIST_MATCH
+static char_u   *fname_match __ARGS((regprog_T *prog, char_u *name));
+static void buflist_setfpos __ARGS((buf_T *buf, win_T *win, linenr_T lnum,
+                                    colnr_T col,
+                                    int copy_options));
+static wininfo_T *find_wininfo __ARGS((buf_T *buf, int skip_diff_buffer));
+#ifdef UNIX
+static buf_T    *buflist_findname_stat __ARGS((char_u *ffname, struct stat *st));
+static int otherfile_buf __ARGS((buf_T *buf, char_u *ffname, struct stat *stp));
+static int buf_same_ino __ARGS((buf_T *buf, struct stat *stp));
+#else
+static int otherfile_buf __ARGS((buf_T *buf, char_u *ffname));
+#endif
+static int ti_change __ARGS((char_u *str, char_u **last));
+static int append_arg_number __ARGS((win_T *wp, char_u *buf, int buflen,
+                                     int add_file));
+static void free_buffer __ARGS((buf_T *));
+static void free_buffer_stuff __ARGS((buf_T *buf, int free_options));
+static void clear_wininfo __ARGS((buf_T *buf));
+
+#ifdef UNIX
+# define dev_T dev_t
+#else
+# define dev_T unsigned
+#endif
+
+
+static char *msg_loclist = N_("[Location List]");
+static char *msg_qflist = N_("[Quickfix List]");
+static char *e_auabort = N_("E855: Autocommands caused command to abort");
+
+/*
+ * Open current buffer, that is: open the memfile and read the file into
+ * memory.
+ * Return FAIL for failure, OK otherwise.
+ */
+int open_buffer(read_stdin, eap, flags)
+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;
+  buf_T       *old_curbuf;
+  long old_tw = curbuf->b_p_tw;
+
+  /*
+   * 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);
+    for (curbuf = firstbuf; curbuf != NULL; curbuf = curbuf->b_next)
+      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(_("E82: Cannot allocate any buffer, exiting..."));
+      getout(2);
+    }
+    EMSG(_("E83: Cannot allocate buffer, using other one..."));
+    enter_buffer(curbuf);
+    if (old_tw != curbuf->b_p_tw)
+      check_colorcolumn(curwin);
+    return FAIL;
+  }
+
+  /* The autocommands in readfile() may change the buffer, but only AFTER
+   * reading the file. */
+  old_curbuf = curbuf;
+  modified_was_set = FALSE;
+
+  /* mark cursor position as being invalid */
+  curwin->w_valid = 0;
+
+  if (curbuf->b_ffname != NULL
+      ) {
+    retval = readfile(curbuf->b_ffname, curbuf->b_fname,
+        (linenr_T)0, (linenr_T)0, (linenr_T)MAXLNUM, eap,
+        flags | READ_NEW);
+    /* Help buffer is filtered. */
+    if (curbuf->b_help)
+      fix_help_buffer();
+  } else if (read_stdin)   {
+    int save_bin = curbuf->b_p_bin;
+    linenr_T line_count;
+
+    /*
+     * 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) {
+      line_count = curbuf->b_ml.ml_line_count;
+      retval = readfile(NULL, NULL, (linenr_T)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, FALSE);
+      } else   {
+        /* Delete the converted lines. */
+        while (curbuf->b_ml.ml_line_count > line_count)
+          ml_delete(line_count, FALSE);
+      }
+      /* Put the cursor on the first line. */
+      curwin->w_cursor.lnum = 1;
+      curwin->w_cursor.col = 0;
+
+      /* Set or reset 'modified' before executing autocommands, so that
+       * it can be changed there. */
+      if (!readonlymode && !bufempty())
+        changed();
+      else if (retval != FAIL)
+        unchanged(curbuf, FALSE);
+      apply_autocmds_retval(EVENT_STDINREADPOST, NULL, NULL, FALSE,
+          curbuf, &retval);
+    }
+  }
+
+  /* if first time loading this buffer, init b_chartab[] */
+  if (curbuf->b_flags & BF_NEVERLOADED) {
+    (void)buf_init_chartab(curbuf, FALSE);
+    parse_cino(curbuf);
+  }
+
+  /*
+   * 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 auto commands.
+   */
+  /* 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 */
+      || (aborting() && vim_strchr(p_cpo, CPO_INTMOD) != NULL)
+      )
+    changed();
+  else if (retval != FAIL && !read_stdin)
+    unchanged(curbuf, FALSE);
+  save_file_ff(curbuf);                 /* keep this fileformat */
+
+  /* require "!" to overwrite the file, because it wasn't read completely */
+  if (aborting())
+    curbuf->b_flags |= BF_READERR;
+
+  /* Need to update automatic folding.  Do this before the autocommands,
+   * they may use the fold info. */
+  foldUpdateAll(curwin);
+
+  /* need to set w_topline, unless some autocommand already did that. */
+  if (!(curwin->w_valid & VALID_TOPLINE)) {
+    curwin->w_topline = 1;
+    curwin->w_topfill = 0;
+  }
+  apply_autocmds_retval(EVENT_BUFENTER, NULL, NULL, FALSE, curbuf, &retval);
+
+  if (retval != FAIL) {
+    /*
+     * The autocommands may have changed the current buffer.  Apply the
+     * modelines to the correct buffer, if it still exists and is loaded.
+     */
+    if (buf_valid(old_curbuf) && old_curbuf->b_ml.ml_mfp != NULL) {
+      aco_save_T aco;
+
+      /* Go to the buffer that was opened. */
+      aucmd_prepbuf(&aco, old_curbuf);
+      do_modelines(0);
+      curbuf->b_flags &= ~(BF_CHECK_RO | BF_NEVERLOADED);
+
+      apply_autocmds_retval(EVENT_BUFWINENTER, NULL, NULL, FALSE, curbuf,
+          &retval);
+
+      /* restore curwin/curbuf and a few other things */
+      aucmd_restbuf(&aco);
+    }
+  }
+
+  return retval;
+}
+
+/*
+ * Return TRUE if "buf" points to a valid buffer (in the buffer list).
+ */
+int buf_valid(buf)
+buf_T       *buf;
+{
+  buf_T       *bp;
+
+  for (bp = firstbuf; bp != NULL; bp = bp->b_next)
+    if (bp == buf)
+      return TRUE;
+  return FALSE;
+}
+
+/*
+ * 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
+ * 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.
+ */
+void close_buffer(win, buf, action, abort_if_last)
+win_T       *win;               /* if not NULL, set b_last_cursor */
+buf_T       *buf;
+int action;
+int abort_if_last UNUSED;
+{
+  int is_curbuf;
+  int nwindows;
+  int unload_buf = (action != 0);
+  int del_buf = (action == DOBUF_DEL || action == DOBUF_WIPE);
+  int wipe_buf = (action == DOBUF_WIPE);
+
+  /*
+   * 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;
+
+  if (win != NULL) {
+    /* 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);
+  }
+
+  /* When the buffer is no longer in a window, trigger BufWinLeave */
+  if (buf->b_nwindows == 1) {
+    buf->b_closing = TRUE;
+    apply_autocmds(EVENT_BUFWINLEAVE, buf->b_fname, buf->b_fname,
+        FALSE, buf);
+    if (!buf_valid(buf)) {
+      /* Autocommands deleted the buffer. */
+aucmd_abort:
+      EMSG(_(e_auabort));
+      return;
+    }
+    buf->b_closing = FALSE;
+    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_closing = TRUE;
+      apply_autocmds(EVENT_BUFHIDDEN, buf->b_fname, buf->b_fname,
+          FALSE, buf);
+      if (!buf_valid(buf))
+        /* Autocommands deleted the buffer. */
+        goto aucmd_abort;
+      buf->b_closing = FALSE;
+      if (abort_if_last && one_window())
+        /* Autocommands made this the only window. */
+        goto aucmd_abort;
+    }
+    if (aborting())         /* autocmds may abort script processing */
+      return;
+  }
+  nwindows = buf->b_nwindows;
+
+  /* decrease the link count from windows (unless not in any window) */
+  if (buf->b_nwindows > 0)
+    --buf->b_nwindows;
+
+  /* Return when a window is displaying the buffer or when it's not
+   * unloaded. */
+  if (buf->b_nwindows > 0 || !unload_buf)
+    return;
+
+  /* Always remove the buffer when there is no file name. */
+  if (buf->b_ffname == NULL)
+    del_buf = TRUE;
+
+  /*
+   * 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));
+  if (
+    win_valid(win) &&
+    win->w_buffer == buf)
+    win->w_buffer = NULL;      /* make sure we don't use the buffer now */
+
+  /* Autocommands may have deleted the buffer. */
+  if (!buf_valid(buf))
+    return;
+  if (aborting())           /* autocmds may abort script processing */
+    return;
+
+  /* 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;
+
+  /*
+   * 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;
+
+  /* Change directories when the 'acd' option is set. */
+  DO_AUTOCHDIR
+
+  /*
+   * Remove the buffer from the list.
+   */
+  if (wipe_buf) {
+    vim_free(buf->b_ffname);
+    vim_free(buf->b_sfname);
+    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;
+  }
+}
+
+/*
+ * Make buffer not contain a file.
+ */
+void buf_clear_file(buf)
+buf_T       *buf;
+{
+  buf->b_ml.ml_line_count = 1;
+  unchanged(buf, TRUE);
+#ifndef SHORT_FNAME
+  buf->b_shortname = FALSE;
+#endif
+  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 */
+}
+
+/*
+ * buf_freeall() - free all things allocated for a buffer that are related to
+ * the file.  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
+ */
+void buf_freeall(buf, flags)
+buf_T       *buf;
+int flags;
+{
+  int is_curbuf = (buf == curbuf);
+
+  buf->b_closing = TRUE;
+  apply_autocmds(EVENT_BUFUNLOAD, buf->b_fname, buf->b_fname, FALSE, buf);
+  if (!buf_valid(buf))              /* autocommands may delete the buffer */
+    return;
+  if ((flags & BFA_DEL) && buf->b_p_bl) {
+    apply_autocmds(EVENT_BUFDELETE, buf->b_fname, buf->b_fname, FALSE, buf);
+    if (!buf_valid(buf))            /* autocommands may delete the buffer */
+      return;
+  }
+  if (flags & BFA_WIPE) {
+    apply_autocmds(EVENT_BUFWIPEOUT, buf->b_fname, buf->b_fname,
+        FALSE, buf);
+    if (!buf_valid(buf))            /* autocommands may delete the buffer */
+      return;
+  }
+  buf->b_closing = FALSE;
+  if (aborting())           /* autocmds may abort script processing */
+    return;
+
+  /*
+   * 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;
+  diff_buf_delete(buf);             /* Can't use 'diff' for unloaded buffer. */
+  /* Remove any ownsyntax, unless exiting. */
+  if (firstwin != NULL && curwin->w_buffer == buf)
+    reset_synblock(curwin);
+
+  /* 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);
+  }
+
+  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 */
+  }
+  syntax_clear(&buf->b_s);          /* reset syntax info */
+  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)
+buf_T       *buf;
+{
+  free_buffer_stuff(buf, TRUE);
+  unref_var_dict(buf->b_vars);
+  aubuflocal_remove(buf);
+  vim_free(buf);
+}
+
+/*
+ * Free stuff in the buffer for ":bdel" and when wiping out the buffer.
+ */
+static void free_buffer_stuff(buf, free_options)
+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);
+    ga_clear(&buf->b_s.b_langp);
+  }
+  vars_clear(&buf->b_vars->dv_hashtab);   /* free all internal variables */
+  hash_init(&buf->b_vars->dv_hashtab);
+  uc_clear(&buf->b_ucmds);              /* clear local user commands */
+  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_free(buf->b_start_fenc);
+  buf->b_start_fenc = NULL;
+}
+
+/*
+ * Free the b_wininfo list for buffer "buf".
+ */
+static void clear_wininfo(buf)
+buf_T       *buf;
+{
+  wininfo_T   *wip;
+
+  while (buf->b_wininfo != NULL) {
+    wip = buf->b_wininfo;
+    buf->b_wininfo = wip->wi_next;
+    if (wip->wi_optset) {
+      clear_winopt(&wip->wi_opt);
+      deleteFoldRecurse(&wip->wi_folds);
+    }
+    vim_free(wip);
+  }
+}
+
+/*
+ * Go to another buffer.  Handles the result of the ATTENTION dialog.
+ */
+void goto_buffer(eap, start, dir, count)
+exarg_T     *eap;
+int start;
+int dir;
+int count;
+{
+# if defined(FEAT_WINDOWS) && defined(HAS_SWAP_EXISTS_ACTION)
+  buf_T       *old_curbuf = curbuf;
+
+  swap_exists_action = SEA_DIALOG;
+# endif
+  (void)do_buffer(*eap->cmd == 's' ? DOBUF_SPLIT : DOBUF_GOTO,
+      start, dir, count, eap->forceit);
+# if defined(FEAT_WINDOWS) && defined(HAS_SWAP_EXISTS_ACTION)
+  if (swap_exists_action == SEA_QUIT && *eap->cmd == 's') {
+    cleanup_T cs;
+
+    /* Reset the error/interrupt/exception state here so that
+     * aborting() returns FALSE when closing a window. */
+    enter_cleanup(&cs);
+
+    /* Quitting means closing the split window, nothing else. */
+    win_close(curwin, TRUE);
+    swap_exists_action = SEA_NONE;
+    swap_exists_did_quit = TRUE;
+
+    /* Restore the error/interrupt/exception state if not discarded by a
+     * new aborting error, interrupt, or uncaught exception. */
+    leave_cleanup(&cs);
+  } else
+    handle_swap_exists(old_curbuf);
+# endif
+}
+
+#if defined(HAS_SWAP_EXISTS_ACTION) || defined(PROTO)
+/*
+ * Handle the situation of swap_exists_action being set.
+ * It is allowed for "old_curbuf" to be NULL or invalid.
+ */
+void handle_swap_exists(old_curbuf)
+buf_T       *old_curbuf;
+{
+  cleanup_T cs;
+  long old_tw = curbuf->b_p_tw;
+
+  if (swap_exists_action == SEA_QUIT) {
+    /* Reset the error/interrupt/exception state here so that
+     * aborting() returns FALSE when closing a buffer. */
+    enter_cleanup(&cs);
+
+    /* 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);
+    if (!buf_valid(old_curbuf) || old_curbuf == curbuf)
+      old_curbuf = buflist_new(NULL, NULL, 1L, BLN_CURBUF | BLN_LISTED);
+    if (old_curbuf != NULL) {
+      enter_buffer(old_curbuf);
+      if (old_tw != curbuf->b_p_tw)
+        check_colorcolumn(curwin);
+    }
+    /* If "old_curbuf" is NULL we are in big trouble here... */
+
+    /* Restore the error/interrupt/exception state if not discarded by a
+     * new aborting error, interrupt, or uncaught exception. */
+    leave_cleanup(&cs);
+  } else if (swap_exists_action == SEA_RECOVER)   {
+    /* Reset the error/interrupt/exception state here so that
+     * aborting() returns FALSE when closing a buffer. */
+    enter_cleanup(&cs);
+
+    /* User selected Recover at ATTENTION prompt. */
+    msg_scroll = TRUE;
+    ml_recover();
+    MSG_PUTS("\n");     /* don't overwrite the last message */
+    cmdline_row = msg_row;
+    do_modelines(0);
+
+    /* Restore the error/interrupt/exception state if not discarded by a
+     * new aborting error, interrupt, or uncaught exception. */
+    leave_cleanup(&cs);
+  }
+  swap_exists_action = SEA_NONE;
+}
+#endif
+
+/*
+ * 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_u * do_bufdel(command, arg, addr_count, start_bnr, end_bnr, forceit)
+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_u      *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 (char_u *)_(e_trailing);
+      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(command, DOBUF_FIRST, FORWARD, (int)bnr,
+                   forceit) == 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,
+              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, _("E515: No buffers were unloaded"));
+      else if (command == DOBUF_DEL)
+        STRCPY(IObuff, _("E516: No buffers were deleted"));
+      else
+        STRCPY(IObuff, _("E517: No buffers were wiped out"));
+      errormsg = IObuff;
+    } else if (deleted >= p_report)   {
+      if (command == DOBUF_UNLOAD) {
+        if (deleted == 1)
+          MSG(_("1 buffer unloaded"));
+        else
+          smsg((char_u *)_("%d buffers unloaded"), deleted);
+      } else if (command == DOBUF_DEL)   {
+        if (deleted == 1)
+          MSG(_("1 buffer deleted"));
+        else
+          smsg((char_u *)_("%d buffers deleted"), deleted);
+      } else   {
+        if (deleted == 1)
+          MSG(_("1 buffer wiped out"));
+        else
+          smsg((char_u *)_("%d buffers wiped out"), deleted);
+      }
+    }
+  }
+
+
+  return errormsg;
+}
+
+#if defined(FEAT_LISTCMDS) || defined(FEAT_PYTHON) \
+  || defined(FEAT_PYTHON3) || defined(PROTO)
+
+static int empty_curbuf __ARGS((int close_others, int forceit, int action));
+
+/*
+ * Make the current buffer empty.
+ * Used when it is wiped out and it's the last buffer.
+ */
+static int empty_curbuf(close_others, forceit, action)
+int close_others;
+int forceit;
+int action;
+{
+  int retval;
+  buf_T   *buf = curbuf;
+
+  if (action == DOBUF_UNLOAD) {
+    EMSG(_("E90: Cannot unload last buffer"));
+    return FAIL;
+  }
+
+  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 && buf_valid(buf) && buf->b_nwindows == 0)
+    close_buffer(NULL, buf, action, 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
+ *
+ * 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.
+ */
+int do_buffer(action, start, dir, count, forceit)
+int action;
+int start;
+int dir;                        /* FORWARD or BACKWARD */
+int count;                      /* buffer number or number of buffers */
+int forceit;                    /* TRUE for :...! */
+{
+  buf_T       *buf;
+  buf_T       *bp;
+  int unload = (action == DOBUF_UNLOAD || action == DOBUF_DEL
+                || action == DOBUF_WIPE);
+
+  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(_("E84: 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(_("E85: 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)
+        EMSGN(_("E86: Buffer %ld does not exist"), count);
+    } else if (dir == FORWARD)
+      EMSG(_("E87: Cannot go beyond last buffer"));
+    else
+      EMSG(_("E88: Cannot go before first buffer"));
+    return FAIL;
+  }
+
+
+  /*
+   * delete buffer buf from memory and/or the list
+   */
+  if (unload) {
+    int forward;
+
+    /* When unloading or deleting a buffer that's already unloaded and
+     * unlisted: fail silently. */
+    if (action != DOBUF_WIPE && buf->b_ml.ml_mfp == NULL && !buf->b_p_bl)
+      return FAIL;
+
+    if (!forceit && bufIsChanged(buf)) {
+      if ((p_confirm || cmdmod.confirm) && p_write) {
+        dialog_changed(buf, FALSE);
+        if (!buf_valid(buf))
+          /* 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   {
+        EMSGN(_(
+                "E89: No write since last change for buffer %ld (add ! to override)"),
+            buf->b_fnum);
+        return FAIL;
+      }
+    }
+
+    /*
+     * If deleting the last (listed) buffer, make it empty.
+     * The last (listed) buffer cannot be unloaded.
+     */
+    for (bp = firstbuf; bp != NULL; bp = bp->b_next)
+      if (bp->b_p_bl && bp != buf)
+        break;
+    if (bp == NULL && buf == curbuf)
+      return empty_curbuf(TRUE, 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_closing)
+           && (firstwin != lastwin || 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 && buf_valid(buf) && buf->b_nwindows <= 0)
+        close_buffer(NULL, buf, action, 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, 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 != NULL && buf_valid(au_new_curbuf))
+      buf = au_new_curbuf;
+    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) {
+          if (buf == curbuf || !buf->b_p_bl)
+            buf = NULL;                 /* skip current and unlisted bufs */
+          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 (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 (buf = firstbuf; buf != NULL; buf = buf->b_next)
+        if (buf->b_p_bl && buf != curbuf)
+          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 (buf == NULL) {
+    /* Autocommands must have wiped out all other buffers.  Only option
+     * now is to make the current buffer empty. */
+    return empty_curbuf(FALSE, forceit, action);
+  }
+
+  /*
+   * make buf 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, forceit)) {
+    if ((p_confirm || cmdmod.confirm) && p_write) {
+      dialog_changed(curbuf, FALSE);
+      if (!buf_valid(buf))
+        /* Autocommand deleted buffer, oops! */
+        return FAIL;
+    }
+    if (bufIsChanged(curbuf)) {
+      EMSG(_(e_nowrtmsg));
+      return FAIL;
+    }
+  }
+
+  /* Go to the other buffer. */
+  set_curbuf(buf, action);
+
+#if defined(FEAT_LISTCMDS) \
+  && (defined(FEAT_SCROLLBIND) || defined(FEAT_CURSORBIND))
+  if (action == DOBUF_SPLIT) {
+    RESET_BINDING(curwin);      /* reset 'scrollbind' and 'cursorbind' */
+  }
+#endif
+
+  if (aborting())           /* autocmds may abort script processing */
+    return FAIL;
+
+  return OK;
+}
+#endif
+
+/*
+ * 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
+ */
+void set_curbuf(buf, action)
+buf_T       *buf;
+int action;
+{
+  buf_T       *prevbuf;
+  int unload = (action == DOBUF_UNLOAD || action == DOBUF_DEL
+                || action == DOBUF_WIPE);
+  long old_tw = curbuf->b_p_tw;
+
+  setpcmark();
+  if (!cmdmod.keepalt)
+    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 */
+  prevbuf = curbuf;
+
+  apply_autocmds(EVENT_BUFLEAVE, NULL, NULL, FALSE, curbuf);
+  if (buf_valid(prevbuf) && !aborting()) {
+    if (prevbuf == curwin->w_buffer)
+      reset_synblock(curwin);
+    if (unload)
+      close_windows(prevbuf, FALSE);
+    if (buf_valid(prevbuf) && !aborting()) {
+      win_T  *previouswin = curwin;
+      if (prevbuf == curbuf)
+        u_sync(FALSE);
+      close_buffer(prevbuf == curwin->w_buffer ? curwin : NULL, prevbuf,
+          unload ? action : (action == DOBUF_GOTO
+                             && !P_HID(prevbuf)
+                             && !bufIsChanged(
+                                 prevbuf)) ? DOBUF_UNLOAD : 0, 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 */
+  if ((buf_valid(buf) && buf != curbuf
+       && !aborting()
+       ) || curwin->w_buffer == NULL
+      ) {
+    enter_buffer(buf);
+    if (old_tw != curbuf->b_p_tw)
+      check_colorcolumn(curwin);
+  }
+}
+
+/*
+ * Enter a new current buffer.
+ * Old curbuf must have been abandoned already!  This also means "curbuf" may
+ * be pointing to freed memory.
+ */
+void enter_buffer(buf)
+buf_T       *buf;
+{
+  /* 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);
+  else
+    /* Remove all folds in the window. */
+    clearFolding(curwin);
+  foldUpdateAll(curwin);        /* update folds (later). */
+
+  /* Get the buffer in the current window. */
+  curwin->w_buffer = buf;
+  curbuf = buf;
+  ++curbuf->b_nwindows;
+
+  if (curwin->w_p_diff)
+    diff_buf_add(curbuf);
+
+  curwin->w_s = &(buf->b_s);
+
+  /* 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;
+
+  /* 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 a 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)
+      need_fileinfo = TRUE;             /* display file info after redraw */
+    (void)buf_check_timestamp(curbuf, FALSE);     /* check if file changed */
+    curwin->w_topline = 1;
+    curwin->w_topfill = 0;
+    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 */
+
+
+  /* Change directories when the 'acd' option is set. */
+  DO_AUTOCHDIR
+
+  if (curbuf->b_kmap_state & KEYMAP_INIT)
+    (void)keymap_init();
+  /* 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);
+
+  redraw_later(NOT_VALID);
+}
+
+/*
+ * Change to the directory of the current buffer.
+ */
+void do_autochdir()          {
+  if (curbuf->b_ffname != NULL && vim_chdirfile(curbuf->b_ffname) == OK)
+    shorten_fnames(TRUE);
+}
+
+/*
+ * functions for dealing with the buffer list
+ */
+
+/*
+ * 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.
+ * This is the ONLY way to create a new buffer.
+ */
+static int top_file_num = 1;            /* highest file number */
+
+buf_T * buflist_new(ffname, sfname, lnum, flags)
+char_u      *ffname;            /* full path of fname or relative */
+char_u      *sfname;            /* short fname or NULL */
+linenr_T lnum;                  /* preferred cursor line */
+int flags;                      /* BLN_ defines */
+{
+  buf_T       *buf;
+#ifdef UNIX
+  struct stat st;
+#endif
+
+  fname_expand(curbuf, &ffname, &sfname);       /* will allocate ffname */
+
+  /*
+   * If 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) && (buf =
+#ifdef UNIX
+                                                   buflist_findname_stat(ffname,
+                                                       &st)
+#else
+                                                   buflist_findname(ffname)
+#endif
+                                                 ) != NULL) {
+    vim_free(ffname);
+    if (lnum != 0)
+      buflist_setfpos(buf, curwin, lnum, (colnr_T)0, FALSE);
+    /* 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) {
+      buf->b_p_bl = TRUE;
+      if (!(flags & BLN_DUMMY))
+        apply_autocmds(EVENT_BUFADD, NULL, NULL, FALSE, buf);
+    }
+    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 != NULL
+      && curbuf->b_ffname == NULL
+      && curbuf->b_nwindows <= 1
+      && (curbuf->b_ml.ml_mfp == NULL || bufempty())) {
+    buf = curbuf;
+    /* It's like this buffer is deleted.  Watch out for autocommands that
+     * change curbuf!  If that happens, allocate a new buffer anyway. */
+    if (curbuf->b_p_bl)
+      apply_autocmds(EVENT_BUFDELETE, NULL, NULL, FALSE, curbuf);
+    if (buf == curbuf)
+      apply_autocmds(EVENT_BUFWIPEOUT, NULL, NULL, FALSE, curbuf);
+    if (aborting())             /* autocmds may abort script processing */
+      return NULL;
+    if (buf == curbuf) {
+      /* Make sure 'bufhidden' and 'buftype' are empty */
+      clear_string_option(&buf->b_p_bh);
+      clear_string_option(&buf->b_p_bt);
+    }
+  }
+  if (buf != curbuf || curbuf == NULL) {
+    buf = (buf_T *)alloc_clear((unsigned)sizeof(buf_T));
+    if (buf == NULL) {
+      vim_free(ffname);
+      return NULL;
+    }
+    /* init b: variables */
+    buf->b_vars = dict_alloc();
+    if (buf->b_vars == NULL) {
+      vim_free(ffname);
+      vim_free(buf);
+      return NULL;
+    }
+    init_var_dict(buf->b_vars, &buf->b_bufvar, VAR_SCOPE);
+  }
+
+  if (ffname != NULL) {
+    buf->b_ffname = ffname;
+    buf->b_sfname = vim_strsave(sfname);
+  }
+
+  clear_wininfo(buf);
+  buf->b_wininfo = (wininfo_T *)alloc_clear((unsigned)sizeof(wininfo_T));
+
+  if ((ffname != NULL && (buf->b_ffname == NULL || buf->b_sfname == NULL))
+      || buf->b_wininfo == NULL) {
+    vim_free(buf->b_ffname);
+    buf->b_ffname = NULL;
+    vim_free(buf->b_sfname);
+    buf->b_sfname = NULL;
+    if (buf != curbuf)
+      free_buffer(buf);
+    return NULL;
+  }
+
+  if (buf == curbuf) {
+    /* free all things allocated for this buffer */
+    buf_freeall(buf, 0);
+    if (buf != curbuf)           /* autocommands deleted the buffer! */
+      return NULL;
+    if (aborting())             /* autocmds may abort script processing */
+      return NULL;
+    /* buf->b_nwindows = 0; why was this here? */
+    free_buffer_stuff(buf, FALSE);      /* delete local variables et al. */
+
+    /* Init the options. */
+    buf->b_p_initialized = FALSE;
+    buf_copy_options(buf, BCO_ENTER);
+
+    /* need to reload lmaps and set b:keymap_name */
+    curbuf->b_kmap_state |= KEYMAP_INIT;
+  } else   {
+    /*
+     * put 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;
+
+    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) {
+        out_flush();
+        ui_delay(3000L, TRUE);          /* make sure it is noticed */
+      }
+      top_file_num = 1;
+    }
+
+    /*
+     * 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;
+
+  hash_init(&buf->b_s.b_keywtab);
+  hash_init(&buf->b_s.b_keywtab_ic);
+
+  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)) {
+    apply_autocmds(EVENT_BUFNEW, NULL, NULL, FALSE, buf);
+    if (flags & BLN_LISTED)
+      apply_autocmds(EVENT_BUFADD, NULL, NULL, FALSE, buf);
+    if (aborting())             /* autocmds may abort script processing */
+      return NULL;
+  }
+
+  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, free_p_ff)
+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);
+  }
+  clear_string_option(&buf->b_p_def);
+  clear_string_option(&buf->b_p_inc);
+  clear_string_option(&buf->b_p_inex);
+  clear_string_option(&buf->b_p_inde);
+  clear_string_option(&buf->b_p_indk);
+  clear_string_option(&buf->b_p_cm);
+  clear_string_option(&buf->b_p_fex);
+  clear_string_option(&buf->b_p_key);
+  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);
+  clear_string_option(&buf->b_p_keymap);
+  ga_clear(&buf->b_kmap_ga);
+  clear_string_option(&buf->b_p_com);
+  clear_string_option(&buf->b_p_cms);
+  clear_string_option(&buf->b_p_nf);
+  clear_string_option(&buf->b_p_syn);
+  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_p_sua);
+  clear_string_option(&buf->b_p_ft);
+  clear_string_option(&buf->b_p_cink);
+  clear_string_option(&buf->b_p_cino);
+  clear_string_option(&buf->b_p_cinw);
+  clear_string_option(&buf->b_p_cpt);
+  clear_string_option(&buf->b_p_cfu);
+  clear_string_option(&buf->b_p_ofu);
+  clear_string_option(&buf->b_p_gp);
+  clear_string_option(&buf->b_p_mp);
+  clear_string_option(&buf->b_p_efm);
+  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_dict);
+  clear_string_option(&buf->b_p_tsr);
+  clear_string_option(&buf->b_p_qe);
+  buf->b_p_ar = -1;
+  buf->b_p_ul = NO_LOCAL_UNDOLEVEL;
+}
+
+/*
+ * 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(n, lnum, options, forceit)
+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_noalt));
+    else
+      EMSGN(_("E92: Buffer %ld 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" or "newtab" and the current buffer
+     * isn't empty: open new window */
+    if (wp == NULL && (swb_flags & (SWB_SPLIT | SWB_NEWTAB)) && !bufempty()) {
+      if (swb_flags & SWB_NEWTAB)               /* Open in a new tab */
+        tabpage_new();
+      else if (win_split(0, 0) == FAIL)         /* Open in a new window */
+        return FAIL;
+      RESET_BINDING(curwin);
+    }
+  }
+
+  ++RedrawingDisabled;
+  if (getfile(buf->b_fnum, NULL, NULL, (options & GETF_SETMARK),
+          lnum, forceit) <= 0) {
+    --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
+ */
+void buflist_getfpos()          {
+  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;
+  }
+}
+
+/*
+ * 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(fname)
+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;
+}
+
+/*
+ * 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(ffname)
+char_u      *ffname;
+{
+#ifdef UNIX
+  struct stat 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(ffname, stp)
+char_u      *ffname;
+struct stat *stp;
+{
+#endif
+  buf_T       *buf;
+
+  for (buf = firstbuf; buf != NULL; buf = buf->b_next)
+    if ((buf->b_flags & BF_DUMMY) == 0 && !otherfile_buf(buf, ffname
+#ifdef UNIX
+            , stp
+#endif
+            ))
+      return buf;
+  return NULL;
+}
+
+#if defined(FEAT_LISTCMDS) || defined(FEAT_EVAL) || defined(FEAT_PERL) \
+  || defined(PROTO)
+/*
+ * Find file in buffer list by a regexp pattern.
+ * Return fnum of the found buffer.
+ * Return < 0 for error.
+ */
+int buflist_findpat(pattern, pattern_end, unlisted, diffmode, curtab_only)
+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;
+  regprog_T   *prog;
+  int match = -1;
+  int find_listed;
+  char_u      *pat;
+  char_u      *patend;
+  int attempt;
+  char_u      *p;
+  int toggledollar;
+
+  if (pattern_end == pattern + 1 && (*pattern == '%' || *pattern == '#')) {
+    if (*pattern == '%')
+      match = curbuf->b_fnum;
+    else
+      match = curwin->w_alt_fnum;
+    if (diffmode && !diff_mode_buf(buflist_findnr(match)))
+      match = -1;
+  }
+  /*
+   * 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) {
+        /* may add '^' and '$' */
+        if (toggledollar)
+          *patend = (attempt < 2) ? NUL : '$';           /* add/remove '$' */
+        p = pat;
+        if (*p == '^' && !(attempt & 1))                 /* add/remove '^' */
+          ++p;
+        prog = vim_regcomp(p, p_magic ? RE_MAGIC : 0);
+        if (prog == NULL) {
+          vim_free(pat);
+          return -1;
+        }
+
+        for (buf = firstbuf; buf != NULL; buf = buf->b_next)
+          if (buf->b_p_bl == find_listed
+              && (!diffmode || diff_mode_buf(buf))
+              && buflist_match(prog, buf) != NULL) {
+            if (curtab_only) {
+              /* Ignore the match if the buffer is not open in
+               * the current tab. */
+              win_T       *wp;
+
+              for (wp = firstwin; wp != NULL; wp = wp->w_next)
+                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(prog);
+        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)
+    EMSG2(_("E93: More than one match for %s"), pattern);
+  else if (match < 0)
+    EMSG2(_("E94: No matching buffer for %s"), pattern);
+  return match;
+}
+#endif
+
+
+/*
+ * Find all buffer names that match.
+ * For command line expansion of ":buf" and ":sbuf".
+ * Return OK if matches found, FAIL otherwise.
+ */
+int ExpandBufnames(pat, num_file, file, options)
+char_u      *pat;
+int         *num_file;
+char_u      ***file;
+int options;
+{
+  int count = 0;
+  buf_T       *buf;
+  int round;
+  char_u      *p;
+  int attempt;
+  regprog_T   *prog;
+  char_u      *patc;
+
+  *num_file = 0;                    /* return values in case of FAIL */
+  *file = NULL;
+
+  /* Make a copy of "pat" and change "^" to "\(^\|[\/]\)". */
+  if (*pat == '^') {
+    patc = alloc((unsigned)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 <= 1; ++attempt) {
+    if (attempt > 0 && patc == pat)
+      break;            /* there was no anchor, no need to try again */
+    prog = vim_regcomp(patc + attempt * 11, RE_MAGIC);
+    if (prog == 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 (buf = firstbuf; buf != NULL; buf = buf->b_next) {
+        if (!buf->b_p_bl)               /* skip unlisted buffers */
+          continue;
+        p = buflist_match(prog, buf);
+        if (p != NULL) {
+          if (round == 1)
+            ++count;
+          else {
+            if (options & WILD_HOME_REPLACE)
+              p = home_replace_save(buf, p);
+            else
+              p = vim_strsave(p);
+            (*file)[count++] = p;
+          }
+        }
+      }
+      if (count == 0)           /* no match found, break here */
+        break;
+      if (round == 1) {
+        *file = (char_u **)alloc((unsigned)(count * sizeof(char_u *)));
+        if (*file == NULL) {
+          vim_regfree(prog);
+          if (patc != pat)
+            vim_free(patc);
+          return FAIL;
+        }
+      }
+    }
+    vim_regfree(prog);
+    if (count)                  /* match(es) found, break here */
+      break;
+  }
+
+  if (patc != pat)
+    vim_free(patc);
+
+  *num_file = count;
+  return count == 0 ? FAIL : OK;
+}
+
+
+#ifdef HAVE_BUFLIST_MATCH
+/*
+ * Check for a match on the file name for buffer "buf" with regprog "prog".
+ */
+static char_u * buflist_match(prog, buf)
+regprog_T   *prog;
+buf_T       *buf;
+{
+  char_u      *match;
+
+  /* First try the short file name, then the long file name. */
+  match = fname_match(prog, buf->b_sfname);
+  if (match == NULL)
+    match = fname_match(prog, buf->b_ffname);
+
+  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(prog, name)
+regprog_T   *prog;
+char_u      *name;
+{
+  char_u      *match = NULL;
+  char_u      *p;
+  regmatch_T regmatch;
+
+  if (name != NULL) {
+    regmatch.regprog = prog;
+    regmatch.rm_ic = p_fic;     /* ignore case when 'fileignorecase' is set */
+    if (vim_regexec(&regmatch, name, (colnr_T)0))
+      match = name;
+    else {
+      /* Replace $(HOME) with '~' and try matching again. */
+      p = home_replace_save(NULL, name);
+      if (p != NULL && vim_regexec(&regmatch, p, (colnr_T)0))
+        match = name;
+      vim_free(p);
+    }
+  }
+
+  return match;
+}
+#endif
+
+/*
+ * find file in buffer list by number
+ */
+buf_T * buflist_findnr(nr)
+int nr;
+{
+  buf_T       *buf;
+
+  if (nr == 0)
+    nr = curwin->w_alt_fnum;
+  for (buf = firstbuf; buf != NULL; buf = buf->b_next)
+    if (buf->b_fnum == nr)
+      return buf;
+  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(n, fullname, helptail)
+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.
+ */
+static void buflist_setfpos(buf, win, lnum, col, copy_options)
+buf_T       *buf;
+win_T       *win;
+linenr_T lnum;
+colnr_T col;
+int copy_options;
+{
+  wininfo_T   *wip;
+
+  for (wip = buf->b_wininfo; wip != NULL; wip = wip->wi_next)
+    if (wip->wi_win == win)
+      break;
+  if (wip == NULL) {
+    /* allocate a new entry */
+    wip = (wininfo_T *)alloc_clear((unsigned)sizeof(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);
+      deleteFoldRecurse(&wip->wi_folds);
+    }
+  }
+  if (lnum != 0) {
+    wip->wi_fpos.lnum = lnum;
+    wip->wi_fpos.col = col;
+  }
+  if (copy_options) {
+    /* Save the window-specific option values. */
+    copy_winopt(&win->w_onebuf_opt, &wip->wi_opt);
+    wip->wi_fold_manual = win->w_fold_manual;
+    cloneFoldGrowArray(&win->w_folds, &wip->wi_folds);
+    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;
+
+  return;
+}
+
+static int wininfo_other_tab_diff __ARGS((wininfo_T *wip));
+
+/*
+ * 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(wip)
+wininfo_T   *wip;
+{
+  win_T       *wp;
+
+  if (wip->wi_opt.wo_diff) {
+    for (wp = firstwin; wp != NULL; wp = wp->w_next)
+      /* 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;
+}
+
+/*
+ * Find info for the current window in buffer "buf".
+ * If not found, return the info for the most recently used window.
+ * 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, skip_diff_buffer)
+buf_T       *buf;
+int skip_diff_buffer UNUSED;
+{
+  wininfo_T   *wip;
+
+  for (wip = buf->b_wininfo; wip != NULL; wip = wip->wi_next)
+    if (wip->wi_win == curwin
+        && (!skip_diff_buffer || !wininfo_other_tab_diff(wip))
+        )
+      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 (wip == NULL) {
+    if (skip_diff_buffer) {
+      for (wip = buf->b_wininfo; wip != NULL; wip = wip->wi_next)
+        if (!wininfo_other_tab_diff(wip))
+          break;
+    } else
+      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)
+buf_T       *buf;
+{
+  wininfo_T   *wip;
+
+  clear_winopt(&curwin->w_onebuf_opt);
+  clearFolding(curwin);
+
+  wip = find_wininfo(buf, TRUE);
+  if (wip != NULL && wip->wi_optset) {
+    copy_winopt(&wip->wi_opt, &curwin->w_onebuf_opt);
+    curwin->w_fold_manual = wip->wi_fold_manual;
+    curwin->w_foldinvalid = TRUE;
+    cloneFoldGrowArray(&wip->wi_folds, &curwin->w_folds);
+  } else
+    copy_winopt(&curwin->w_allbuf_opt, &curwin->w_onebuf_opt);
+
+  /* Set 'foldlevel' to 'foldlevelstart' if it's not negative. */
+  if (p_fdls >= 0)
+    curwin->w_p_fdl = p_fdls;
+  check_colorcolumn(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)
+buf_T       *buf;
+{
+  wininfo_T   *wip;
+  static pos_T no_position = INIT_POS_T(1, 0, 0);
+
+  wip = find_wininfo(buf, 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)
+buf_T       *buf;
+{
+  return buflist_findfpos(buf)->lnum;
+}
+
+/*
+ * List all know file names (for :files and :buffers command).
+ */
+void buflist_list(eap)
+exarg_T     *eap;
+{
+  buf_T       *buf;
+  int len;
+  int i;
+
+  for (buf = firstbuf; buf != NULL && !got_int; buf = buf->b_next) {
+    /* skip unlisted buffers, unless ! was used */
+    if (!buf->b_p_bl && !eap->forceit)
+      continue;
+    msg_putchar('\n');
+    if (buf_spname(buf) != NULL)
+      vim_strncpy(NameBuff, buf_spname(buf), MAXPATHL - 1);
+    else
+      home_replace(buf, buf->b_fname, NameBuff, MAXPATHL, TRUE);
+
+    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'),
+        !buf->b_p_ma ? '-' : (buf->b_p_ro ? '=' : ' '),
+        (buf->b_flags & BF_READERR) ? 'x'
+        : (bufIsChanged(buf) ? '+' : ' '),
+        NameBuff);
+
+    /* 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);
+    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();
+  }
+}
+
+/*
+ * 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(fnum, fname, lnum)
+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', short file name to 'sfname'.
+ * 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, ffname, sfname, message)
+buf_T       *buf;
+char_u      *ffname, *sfname;
+int message;                    /* give message when buffer already exists */
+{
+  buf_T       *obuf = NULL;
+#ifdef UNIX
+  struct stat st;
+#endif
+
+  if (ffname == NULL || *ffname == NUL) {
+    /* Removing the name. */
+    vim_free(buf->b_ffname);
+    vim_free(buf->b_sfname);
+    buf->b_ffname = NULL;
+    buf->b_sfname = NULL;
+#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) {
+      if (obuf->b_ml.ml_mfp != NULL) {          /* it's loaded, fail */
+        if (message)
+          EMSG(_("E95: Buffer with this name already exists"));
+        vim_free(ffname);
+        return FAIL;
+      }
+      /* delete from the list */
+      close_buffer(NULL, obuf, DOBUF_WIPE, FALSE);
+    }
+    sfname = vim_strsave(sfname);
+    if (ffname == NULL || sfname == NULL) {
+      vim_free(sfname);
+      vim_free(ffname);
+      return FAIL;
+    }
+#ifdef USE_FNAME_CASE
+# ifdef USE_LONG_FNAME
+    if (USE_LONG_FNAME)
+# endif
+    fname_case(sfname, 0);            /* set correct case for short file name */
+#endif
+    vim_free(buf->b_ffname);
+    vim_free(buf->b_sfname);
+    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
+
+#ifndef SHORT_FNAME
+  buf->b_shortname = FALSE;
+#endif
+
+  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(fnum, name)
+int fnum;
+char_u      *name;
+{
+  buf_T       *buf;
+
+  buf = buflist_findnr(fnum);
+  if (buf != NULL) {
+    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)
+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);
+
+  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(ffname, sfname, lnum)
+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.keepalt)
+    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(errmsg)
+int errmsg;                     /* give error message */
+{
+  char_u      *fname;
+  linenr_T dummy;
+
+  if (buflist_name_nr(0, &fname, &dummy) == FAIL) {
+    if (errmsg)
+      EMSG(_(e_noalt));
+    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(fname, flags)
+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()          {
+  buf_T       *bp;
+
+  for (bp = firstbuf; bp != NULL; bp = bp->b_next) {
+    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)
+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(ffname)
+char_u      *ffname;
+{
+  return otherfile_buf(curbuf, ffname
+#ifdef UNIX
+      , NULL
+#endif
+      );
+}
+
+static int otherfile_buf(buf, ffname
+#ifdef UNIX
+    , stp
+#endif
+    )
+buf_T       *buf;
+char_u      *ffname;
+#ifdef UNIX
+struct stat *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
+  {
+    struct stat st;
+
+    /* If no struct stat 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)
+buf_T       *buf;
+{
+  struct stat 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, stp)
+buf_T       *buf;
+struct stat *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(fullname, shorthelp, dont_truncate)
+int fullname;               /* when non-zero print full path */
+int shorthelp;
+int dont_truncate;
+{
+  char_u      *name;
+  int n;
+  char_u      *p;
+  char_u      *buffer;
+  size_t len;
+
+  buffer = alloc(IOSIZE);
+  if (buffer == NULL)
+    return;
+
+  if (fullname > 1) {       /* 2 CTRL-G: include buffer number */
+    vim_snprintf((char *)buffer, IOSIZE, "buf %d: ", curbuf->b_fnum);
+    p = buffer + STRLEN(buffer);
+  } else
+    p = buffer;
+
+  *p++ = '"';
+  if (buf_spname(curbuf) != NULL)
+    vim_strncpy(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, p,
+        (int)(IOSIZE - (p - buffer)), TRUE);
+  }
+
+  vim_snprintf_add((char *)buffer, IOSIZE, "\"%s%s%s%s%s%s",
+      curbufIsChanged() ? (shortmess(SHM_MOD)
+                           ?  " [+]" : _(" [Modified]")) : " ",
+      (curbuf->b_flags & BF_NOTEDITED)
+      && !bt_dontwrite(curbuf)
+      ? _("[Not edited]") : "",
+      (curbuf->b_flags & BF_NEW)
+      && !bt_dontwrite(curbuf)
+      ? _("[New file]") : "",
+      (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((char *)buffer, IOSIZE, "%s", _(no_lines_msg));
+  } else if (p_ru)   {
+    /* Current line and column are already on the screen -- webb */
+    if (curbuf->b_ml.ml_line_count == 1)
+      vim_snprintf_add((char *)buffer, IOSIZE, _("1 line --%d%%--"), n);
+    else
+      vim_snprintf_add((char *)buffer, IOSIZE, _("%ld lines --%d%%--"),
+          (long)curbuf->b_ml.ml_line_count, n);
+  } else   {
+    vim_snprintf_add((char *)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(buffer + len, IOSIZE - len,
+        (int)curwin->w_cursor.col + 1, (int)curwin->w_virtcol + 1);
+  }
+
+  (void)append_arg_number(curwin, 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(p, 0);
+  }
+
+  vim_free(buffer);
+}
+
+void col_print(buf, buflen, col, vcol)
+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);
+}
+
+/*
+ * put file name in title bar of window and in icon title
+ */
+
+static char_u *lasttitle = NULL;
+static char_u *lasticon = NULL;
+
+void maketitle()          {
+  char_u      *p;
+  char_u      *t_str = NULL;
+  char_u      *i_name;
+  char_u      *i_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;
+
+  if (p_title) {
+    if (p_titlelen > 0) {
+      maxlen = p_titlelen * Columns / 100;
+      if (maxlen < 10)
+        maxlen = 10;
+    }
+
+    t_str = buf;
+    if (*p_titlestring != NUL) {
+      if (stl_syntax & STL_IN_TITLE) {
+        int use_sandbox = FALSE;
+        int save_called_emsg = called_emsg;
+
+        use_sandbox = was_set_insecurely((char_u *)"titlestring", 0);
+        called_emsg = FALSE;
+        build_stl_str_hl(curwin, t_str, sizeof(buf),
+            p_titlestring, use_sandbox,
+            0, maxlen, NULL, NULL);
+        if (called_emsg)
+          set_string_option_direct((char_u *)"titlestring", -1,
+              (char_u *)"", OPT_FREE, SID_ERROR);
+        called_emsg |= save_called_emsg;
+      } else
+        t_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);
+      else {
+        p = transstr(gettail(curbuf->b_fname));
+        vim_strncpy(buf, p, SPACE_FOR_FNAME);
+        vim_free(p);
+      }
+
+      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) {
+        /* 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);
+
+      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 = ti_change(t_str, &lasttitle);
+
+  if (p_icon) {
+    i_str = buf;
+    if (*p_iconstring != NUL) {
+      if (stl_syntax & STL_IN_ICON) {
+        int use_sandbox = FALSE;
+        int save_called_emsg = called_emsg;
+
+        use_sandbox = was_set_insecurely((char_u *)"iconstring", 0);
+        called_emsg = FALSE;
+        build_stl_str_hl(curwin, i_str, sizeof(buf),
+            p_iconstring, use_sandbox,
+            0, 0, NULL, NULL);
+        if (called_emsg)
+          set_string_option_direct((char_u *)"iconstring", -1,
+              (char_u *)"", OPT_FREE, SID_ERROR);
+        called_emsg |= save_called_emsg;
+      } else
+        i_str = p_iconstring;
+    } else   {
+      if (buf_spname(curbuf) != NULL)
+        i_name = buf_spname(curbuf);
+      else                          /* use file name only in icon */
+        i_name = gettail(curbuf->b_ffname);
+      *i_str = NUL;
+      /* Truncate name at 100 bytes. */
+      len = (int)STRLEN(i_name);
+      if (len > 100) {
+        len -= 100;
+        if (has_mbyte)
+          len += (*mb_tail_off)(i_name, i_name + len) + 1;
+        i_name += len;
+      }
+      STRCPY(i_str, i_name);
+      trans_characters(i_str, IOSIZE);
+    }
+  }
+
+  mustset |= ti_change(i_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 when "*last" changed.
+ */
+static int ti_change(str, last)
+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;
+    else
+      *last = vim_strsave(str);
+    return TRUE;
+  }
+  return FALSE;
+}
+
+/*
+ * Put current window title back (used after calling a shell)
+ */
+void resettitle()          {
+  mch_settitle(lasttitle, lasticon);
+}
+
+# if defined(EXITFREE) || defined(PROTO)
+void free_titles()          {
+  vim_free(lasttitle);
+  vim_free(lasticon);
+}
+
+# endif
+
+
+/*
+ * 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(wp, out, outlen, fmt, use_sandbox, fillchar,
+    maxwidth, hltab, tabtab)
+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;
+struct stl_hlrec *hltab;        /* return: HL attributes (can be NULL) */
+struct stl_hlrec *tabtab;       /* return: tab page nrs (can be NULL) */
+{
+  char_u      *p;
+  char_u      *s;
+  char_u      *t;
+  int byteval;
+  win_T       *o_curwin;
+  buf_T       *o_curbuf;
+  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 groupitem[STL_MAX_ITEM];
+  int groupdepth;
+  struct stl_item {
+    char_u          *start;
+    int minwid;
+    int maxwid;
+    enum {
+      Normal,
+      Empty,
+      Group,
+      Middle,
+      Highlight,
+      TabPage,
+      Trunc
+    }               type;
+  }           item[STL_MAX_ITEM];
+  int minwid;
+  int maxwid;
+  int zeropad;
+  char_u base;
+  char_u opt;
+#define TMPLEN 70
+  char_u tmp[TMPLEN];
+  char_u      *usefmt = fmt;
+  struct stl_hlrec *sp;
+
+  /*
+   * 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] == '!') {
+    usefmt = eval_to_string_safe(fmt + 2, NULL, use_sandbox);
+    if (usefmt == NULL)
+      usefmt = fmt;
+  }
+
+  if (fillchar == 0)
+    fillchar = ' ';
+  /* Can't handle a multi-byte fill character yet. */
+  else if (mb_char2len(fillchar) > 1)
+    fillchar = '-';
+
+  /* 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, wp->w_cursor.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. */
+  if (wp->w_cursor.col > (colnr_T)STRLEN(p))
+    byteval = 0;
+  else
+    byteval = (*mb_ptr2char)(p + wp->w_cursor.col);
+
+  groupdepth = 0;
+  p = out;
+  curitem = 0;
+  prevchar_isflag = TRUE;
+  prevchar_isitem = FALSE;
+  for (s = usefmt; *s; ) {
+    if (curitem == STL_MAX_ITEM) {
+      /* There are too many items.  Add the error code to the statusline
+       * to give the user a hint about what went wrong. */
+      if (p + 6 < out + outlen) {
+        mch_memmove(p, " E541", (size_t)5);
+        p += 5;
+      }
+      break;
+    }
+
+    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;
+      item[curitem].type = Middle;
+      item[curitem++].start = p;
+      continue;
+    }
+    if (*s == STL_TRUNCMARK) {
+      s++;
+      item[curitem].type = Trunc;
+      item[curitem++].start = p;
+      continue;
+    }
+    if (*s == ')') {
+      s++;
+      if (groupdepth < 1)
+        continue;
+      groupdepth--;
+
+      t = item[groupitem[groupdepth]].start;
+      *p = NUL;
+      l = vim_strsize(t);
+      if (curitem > groupitem[groupdepth] + 1
+          && item[groupitem[groupdepth]].minwid == 0) {
+        /* remove group if all items are empty */
+        for (n = groupitem[groupdepth] + 1; n < curitem; n++)
+          if (item[n].type == Normal)
+            break;
+        if (n == curitem) {
+          p = t;
+          l = 0;
+        }
+      }
+      if (l > item[groupitem[groupdepth]].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 >= item[groupitem[groupdepth]].maxwid) {
+            l -= ptr2cells(t + n);
+            n += (*mb_ptr2len)(t + n);
+          }
+        } else
+          n = (long)(p - t) - item[groupitem[groupdepth]].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 < item[groupitem[groupdepth]].minwid)
+          *p++ = fillchar;
+
+        /* correct the start of the items for the truncation */
+        for (l = groupitem[groupdepth] + 1; l < curitem; l++) {
+          item[l].start -= n;
+          if (item[l].start < t)
+            item[l].start = t;
+        }
+      } else if (abs(item[groupitem[groupdepth]].minwid) > l)   {
+        /* fill */
+        n = item[groupitem[groupdepth]].minwid;
+        if (n < 0) {
+          /* fill by appending characters */
+          n = 0 - n;
+          while (l++ < n && p + 1 < out + outlen)
+            *p++ = fillchar;
+        } else   {
+          /* fill by inserting characters */
+          mch_memmove(t + n - l, t, (size_t)(p - t));
+          l = n - l;
+          if (p + l >= out + outlen)
+            l = (long)((out + outlen) - p - 1);
+          p += l;
+          for (n = groupitem[groupdepth] + 1; n < curitem; n++)
+            item[n].start += l;
+          for (; l > 0; l--)
+            *t++ = fillchar;
+        }
+      }
+      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) {
+      item[curitem].type = Highlight;
+      item[curitem].start = p;
+      item[curitem].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 (item[n].type == TabPage && item[n].minwid >= 0) {
+              minwid = item[n].minwid;
+              break;
+            }
+        } else
+          /* close nrs are stored as negative values */
+          minwid = -minwid;
+      }
+      item[curitem].type = TabPage;
+      item[curitem].start = p;
+      item[curitem].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 == '(') {
+      groupitem[groupdepth++] = curitem;
+      item[curitem].type = Group;
+      item[curitem].start = p;
+      item[curitem].minwid = minwid;
+      item[curitem].maxwid = maxwid;
+      s++;
+      curitem++;
+      continue;
+    }
+    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:     /* '{' */
+      itemisflag = TRUE;
+      t = p;
+      while (*s != '}' && *s != NUL && p + 1 < out + outlen)
+        *p++ = *s++;
+      if (*s != '}')            /* missing '}' or out of space */
+        break;
+      s++;
+      *p = 0;
+      p = t;
+
+      vim_snprintf((char *)tmp, sizeof(tmp), "%d", curbuf->b_fnum);
+      set_internal_string_var((char_u *)"actual_curbuf", tmp);
+
+      o_curbuf = curbuf;
+      o_curwin = curwin;
+      curwin = wp;
+      curbuf = wp->w_buffer;
+
+      str = eval_to_string_safe(p, &t, use_sandbox);
+
+      curwin = o_curwin;
+      curbuf = o_curbuf;
+      do_unlet((char_u *)"g:actual_curbuf", TRUE);
+
+      if (str != NULL && *str != 0) {
+        if (*skipdigits(str) == NUL) {
+          num = atoi((char *)str);
+          vim_free(str);
+          str = NULL;
+          itemisflag = FALSE;
+        }
+      }
+      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 & INSERT) && empty_line
+            ? 0 : (int)wp->w_cursor.col + 1;
+      break;
+
+    case STL_VIRTCOL:
+    case STL_VIRTCOL_ALT:
+      /* In list mode virtcol needs to be recomputed */
+      virtcol = wp->w_virtcol;
+      if (wp->w_p_list && lcs_tab1 == NUL) {
+        wp->w_p_list = FALSE;
+        getvcol(wp, &wp->w_cursor, NULL, &virtcol, NULL);
+        wp->w_p_list = TRUE;
+      }
+      ++virtcol;
+      /* Don't display %V if it's the same as %c. */
+      if (opt == STL_VIRTCOL_ALT
+          && (virtcol == (colnr_T)(!(State & INSERT) && 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 = tmp;
+      get_rel_pos(wp, str, TMPLEN);
+      break;
+
+    case STL_ARGLISTSTAT:
+      fillable = FALSE;
+      tmp[0] = 0;
+      if (append_arg_number(wp, tmp, (int)sizeof(tmp), FALSE))
+        str = tmp;
+      break;
+
+    case STL_KEYMAP:
+      fillable = FALSE;
+      if (get_keymap_str(wp, tmp, TMPLEN))
+        str = tmp;
+      break;
+    case STL_PAGENUM:
+      num = printer_page_num;
+      break;
+
+    case STL_BUFNO:
+      num = wp->w_buffer->b_fnum;
+      break;
+
+    case STL_OFFSET_X:
+      base = 'X';
+    case STL_OFFSET:
+      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 & INSERT) && empty_line ?
+                          0 : (int)wp->w_cursor.col);
+      break;
+
+    case STL_BYTEVAL_X:
+      base = 'X';
+    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 *)tmp, sizeof(tmp), "[%s]",
+            wp->w_buffer->b_p_ft);
+        str = 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 *)tmp, sizeof(tmp), ",%s",
+            wp->w_buffer->b_p_ft);
+        for (t = tmp; *t != 0; t++)
+          *t = TOUPPER_LOC(*t);
+        str = tmp;
+      }
+      break;
+
+    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;
+
+    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 == '#') {
+        item[curitem].type = Highlight;
+        item[curitem].start = p;
+        item[curitem].minwid = -syn_namen2id(t, (int)(s - t));
+        curitem++;
+      }
+      if (*s != NUL)
+        ++s;
+      continue;
+    }
+
+    item[curitem].start = p;
+    item[curitem].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
+            *p++ = fillchar;
+        }
+        minwid = 0;
+      } else
+        minwid *= -1;
+      while (*t && p + 1 < out + outlen) {
+        *p++ = *t++;
+        /* Change a space by fillchar, unless fillchar is '-' and a
+         * digit follows. */
+        if (fillable && p[-1] == ' '
+            && (!VIM_ISDIGIT(*t) || fillchar != '-'))
+          p[-1] = fillchar;
+      }
+      for (; l < minwid && p + 1 < out + outlen; l++)
+        *p++ = fillchar;
+    } 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
+      item[curitem].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;
+
+  if (usefmt != fmt)
+    vim_free(usefmt);
+
+  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 (item[l].type == Trunc) {
+          /* Truncate at %< item. */
+          s = item[l].start;
+          break;
+        }
+      if (l == itemcnt) {
+        /* No %< item, truncate first item. */
+        s = item[0].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)
+          *s++ = fillchar;
+      } else
+        s = out + maxwidth - 1;
+      for (l = 0; l < itemcnt; l++)
+        if (item[l].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);
+        *s++ = fillchar;
+        *s = NUL;
+      }
+
+      --n;              /* count the '<' */
+      for (; l < itemcnt; l++) {
+        if (item[l].start - n >= s)
+          item[l].start -= n;
+        else
+          item[l].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 (item[l].type == Middle)
+        break;
+    if (l < itemcnt) {
+      p = item[l].start + maxwidth - width;
+      STRMOVE(p, item[l].start);
+      for (s = item[l].start; s < p; s++)
+        *s = fillchar;
+      for (l++; l < itemcnt; l++)
+        item[l].start += maxwidth - width;
+      width = maxwidth;
+    }
+  }
+
+  /* Store the info about highlighting. */
+  if (hltab != NULL) {
+    sp = hltab;
+    for (l = 0; l < itemcnt; l++) {
+      if (item[l].type == Highlight) {
+        sp->start = item[l].start;
+        sp->userhl = item[l].minwid;
+        sp++;
+      }
+    }
+    sp->start = NULL;
+    sp->userhl = 0;
+  }
+
+  /* Store the info about tab pages labels. */
+  if (tabtab != NULL) {
+    sp = tabtab;
+    for (l = 0; l < itemcnt; l++) {
+      if (item[l].type == TabPage) {
+        sp->start = item[l].start;
+        sp->userhl = item[l].minwid;
+        sp++;
+      }
+    }
+    sp->start = NULL;
+    sp->userhl = 0;
+  }
+
+  return width;
+}
+
+#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(wp, buf, buflen)
+win_T       *wp;
+char_u      *buf;
+int buflen;
+{
+  long above;          /* number of lines above window */
+  long below;          /* number of lines below window */
+
+  above = wp->w_topline - 1;
+  above += diff_check_fill(wp, wp->w_topline) - wp->w_topfill;
+  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(wp, buf, buflen, add_file)
+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(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
+      )
+    return FullName_save(fname, FALSE);
+
+  fname = vim_strsave(fname);
+
+# ifdef USE_FNAME_CASE
+#  ifdef USE_LONG_FNAME
+  if (USE_LONG_FNAME)
+#  endif
+  {
+    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).
+ */
+void fname_expand(buf, ffname, sfname)
+buf_T       *buf UNUSED;
+char_u      **ffname;
+char_u      **sfname;
+{
+  if (*ffname == NULL)          /* if no file name given, nothing to do */
+    return;
+  if (*sfname == NULL)          /* if 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_shortcut(*ffname);
+    if (rfname != NULL) {
+      vim_free(*ffname);
+      *ffname = rfname;
+      *sfname = rfname;
+    }
+  }
+#endif
+}
+
+/*
+ * Get the file name for an argument list entry.
+ */
+char_u * alist_name(aep)
+aentry_T    *aep;
+{
+  buf_T       *bp;
+
+  /* Use the name from the associated buffer if it exists. */
+  bp = buflist_findnr(aep->ae_fnum);
+  if (bp == NULL || bp->b_fname == NULL)
+    return aep->ae_fname;
+  return bp->b_fname;
+}
+
+/*
+ * do_arg_all(): Open up to 'count' windows, one for each argument.
+ */
+void do_arg_all(count, forceit, keep_tabs)
+int count;
+int forceit;                    /* hide buffers in current windows */
+int keep_tabs;                  /* keep current tabs, for ":tab drop file" */
+{
+  int i;
+  win_T       *wp, *wpnext;
+  char_u      *opened;          /* Array of weight for which args are open:
+                                 *  0: not opened
+                                 *  1: opened in other tab
+                                 *  2: opened in curtab
+                                 *  3: opened in curtab and curwin
+                                 */
+  int opened_len;               /* length of opened[] */
+  int use_firstwin = FALSE;             /* use first window for arglist */
+  int split_ret = OK;
+  int p_ea_save;
+  alist_T     *alist;           /* argument list to be used */
+  buf_T       *buf;
+  tabpage_T   *tpnext;
+  int had_tab = cmdmod.tab;
+  win_T       *old_curwin, *last_curwin;
+  tabpage_T   *old_curtab, *last_curtab;
+  win_T       *new_curwin = NULL;
+  tabpage_T   *new_curtab = NULL;
+
+  if (ARGCOUNT <= 0) {
+    /* Don't give an error message.  We don't want it when the ":all"
+     * command is in the .vimrc. */
+    return;
+  }
+  setpcmark();
+
+  opened_len = ARGCOUNT;
+  opened = alloc_clear((unsigned)opened_len);
+  if (opened == NULL)
+    return;
+
+  /* Autocommands may do anything to the argument list.  Make sure it's not
+   * freed while we are working here by "locking" it.  We still have to
+   * watch out for its size to be changed. */
+  alist = curwin->w_alist;
+  ++alist->al_refcount;
+
+  old_curwin = curwin;
+  old_curtab = curtab;
+
+
+  /*
+   * Try closing all windows that are not in the argument list.
+   * Also close windows that are not full width;
+   * When 'hidden' or "forceit" set the buffer becomes hidden.
+   * Windows that have a changed buffer and can't be hidden won't be closed.
+   * When the ":tab" modifier was used do this for all tab pages.
+   */
+  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;
+      buf = wp->w_buffer;
+      if (buf->b_ffname == NULL
+          || (!keep_tabs && buf->b_nwindows > 1)
+          || wp->w_width != Columns
+          )
+        i = opened_len;
+      else {
+        /* check if the buffer in this window is in the arglist */
+        for (i = 0; i < opened_len; ++i) {
+          if (i < alist->al_ga.ga_len
+              && (AARGLIST(alist)[i].ae_fnum == buf->b_fnum
+                  || fullpathcmp(alist_name(&AARGLIST(alist)[i]),
+                      buf->b_ffname, TRUE) & FPC_SAME)) {
+            int weight = 1;
+
+            if (old_curtab == curtab) {
+              ++weight;
+              if (old_curwin == wp)
+                ++weight;
+            }
+
+            if (weight > (int)opened[i]) {
+              opened[i] = (char_u)weight;
+              if (i == 0) {
+                if (new_curwin != NULL)
+                  new_curwin->w_arg_idx = opened_len;
+                new_curwin = wp;
+                new_curtab = curtab;
+              }
+            } else if (keep_tabs)
+              i = opened_len;
+
+            if (wp->w_alist != alist) {
+              /* Use the current argument list for all windows
+               * containing a file from it. */
+              alist_unlink(wp->w_alist);
+              wp->w_alist = alist;
+              ++wp->w_alist->al_refcount;
+            }
+            break;
+          }
+        }
+      }
+      wp->w_arg_idx = i;
+
+      if (i == opened_len && !keep_tabs) {    /* close this window */
+        if (P_HID(buf) || forceit || buf->b_nwindows > 1
+            || !bufIsChanged(buf)) {
+          /* If the buffer was changed, and we would like to hide it,
+           * try autowriting. */
+          if (!P_HID(buf) && buf->b_nwindows <= 1
+              && bufIsChanged(buf)) {
+            (void)autowrite(buf, FALSE);
+            /* check if autocommands removed the window */
+            if (!win_valid(wp) || !buf_valid(buf)) {
+              wpnext = firstwin;                /* start all over... */
+              continue;
+            }
+          }
+          /* don't close last window */
+          if (firstwin == lastwin
+              && (first_tabpage->tp_next == NULL || !had_tab))
+            use_firstwin = TRUE;
+          else {
+            win_close(wp, !P_HID(buf) && !bufIsChanged(buf));
+            /* check if autocommands removed the next window */
+            if (!win_valid(wpnext))
+              wpnext = firstwin;                /* start all over... */
+          }
+        }
+      }
+    }
+
+    /* Without the ":tab" modifier only do the current tab page. */
+    if (had_tab == 0 || tpnext == NULL)
+      break;
+
+    /* check if autocommands removed the next tab page */
+    if (!valid_tabpage(tpnext))
+      tpnext = first_tabpage;           /* start all over...*/
+    goto_tabpage_tp(tpnext, TRUE, TRUE);
+  }
+
+  /*
+   * Open a window for files in the argument list that don't have one.
+   * ARGCOUNT may change while doing this, because of autocommands.
+   */
+  if (count > opened_len || count <= 0)
+    count = opened_len;
+
+  /* Don't execute Win/Buf Enter/Leave autocommands here. */
+  ++autocmd_no_enter;
+  ++autocmd_no_leave;
+  last_curwin = curwin;
+  last_curtab = curtab;
+  win_enter(lastwin, FALSE);
+  /* ":drop all" should re-use an empty window to avoid "--remote-tab"
+   * leaving an empty tab page when executed locally. */
+  if (keep_tabs && bufempty() && curbuf->b_nwindows == 1
+      && curbuf->b_ffname == NULL && !curbuf->b_changed)
+    use_firstwin = TRUE;
+
+  for (i = 0; i < count && i < opened_len && !got_int; ++i) {
+    if (alist == &global_alist && i == global_alist.al_ga.ga_len - 1)
+      arg_had_last = TRUE;
+    if (opened[i] > 0) {
+      /* Move the already present window to below the current window */
+      if (curwin->w_arg_idx != i) {
+        for (wpnext = firstwin; wpnext != NULL; wpnext = wpnext->w_next) {
+          if (wpnext->w_arg_idx == i) {
+            if (keep_tabs) {
+              new_curwin = wpnext;
+              new_curtab = curtab;
+            } else
+              win_move_after(wpnext, curwin);
+            break;
+          }
+        }
+      }
+    } else if (split_ret == OK)   {
+      if (!use_firstwin) {              /* split current window */
+        p_ea_save = p_ea;
+        p_ea = TRUE;                    /* use space from all windows */
+        split_ret = win_split(0, WSP_ROOM | WSP_BELOW);
+        p_ea = p_ea_save;
+        if (split_ret == FAIL)
+          continue;
+      } else        /* first window: do autocmd for leaving this buffer */
+        --autocmd_no_leave;
+
+      /*
+       * edit file "i"
+       */
+      curwin->w_arg_idx = i;
+      if (i == 0) {
+        new_curwin = curwin;
+        new_curtab = curtab;
+      }
+      (void)do_ecmd(0, alist_name(&AARGLIST(alist)[i]), NULL, NULL,
+          ECMD_ONE,
+          ((P_HID(curwin->w_buffer)
+            || bufIsChanged(curwin->w_buffer)) ? ECMD_HIDE : 0)
+          + ECMD_OLDBUF, curwin);
+      if (use_firstwin)
+        ++autocmd_no_leave;
+      use_firstwin = FALSE;
+    }
+    ui_breakcheck();
+
+    /* When ":tab" was used open a new tab for a new window repeatedly. */
+    if (had_tab > 0 && tabpage_index(NULL) <= p_tpm)
+      cmdmod.tab = 9999;
+  }
+
+  /* Remove the "lock" on the argument list. */
+  alist_unlink(alist);
+
+  --autocmd_no_enter;
+  /* restore last referenced tabpage's curwin */
+  if (last_curtab != new_curtab) {
+    if (valid_tabpage(last_curtab))
+      goto_tabpage_tp(last_curtab, TRUE, TRUE);
+    if (win_valid(last_curwin))
+      win_enter(last_curwin, FALSE);
+  }
+  /* to window with first arg */
+  if (valid_tabpage(new_curtab))
+    goto_tabpage_tp(new_curtab, TRUE, TRUE);
+  if (win_valid(new_curwin))
+    win_enter(new_curwin, FALSE);
+
+  --autocmd_no_leave;
+  vim_free(opened);
+}
+
+/*
+ * Open a window for a number of buffers.
+ */
+void ex_buffer_all(eap)
+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.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();
+
+
+  /*
+   * 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.split & WSP_VERT)
+               ? wp->w_height + wp->w_status_height < Rows - p_ch
+               - tabline_height()
+               : wp->w_width != Columns)
+           || (had_tab > 0 && wp != firstwin)
+           ) && firstwin != lastwin
+          && !(wp->w_closing || wp->w_buffer->b_closing)
+          ) {
+        win_close(wp, FALSE);
+        wpnext = firstwin;              /* just in case an autocommand does
+                                           something strange with windows */
+        tpnext = first_tabpage;         /* start all over...*/
+        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 (wp = firstwin; wp != NULL; wp = wp->w_next)
+        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) {
+      /* 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. */
+#if defined(HAS_SWAP_EXISTS_ACTION)
+      swap_exists_action = SEA_DIALOG;
+#endif
+      set_curbuf(buf, DOBUF_GOTO);
+      if (!buf_valid(buf)) {            /* autocommands deleted the buffer!!! */
+#if defined(HAS_SWAP_EXISTS_ACTION)
+        swap_exists_action = SEA_NONE;
+# endif
+        break;
+      }
+#if defined(HAS_SWAP_EXISTS_ACTION)
+      if (swap_exists_action == SEA_QUIT) {
+        cleanup_T cs;
+
+        /* Reset the error/interrupt/exception state here so that
+         * aborting() returns FALSE when closing a window. */
+        enter_cleanup(&cs);
+
+        /* 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;
+
+        /* Restore the error/interrupt/exception state if not
+         * discarded by a new aborting error, interrupt, or uncaught
+         * exception. */
+        leave_cleanup(&cs);
+      } else
+        handle_swap_exists(NULL);
+#endif
+    }
+
+    ui_breakcheck();
+    if (got_int) {
+      (void)vgetc();            /* only break the file loading, not the rest */
+      break;
+    }
+    /* Autocommands deleted the buffer or aborted script processing!!! */
+    if (aborting())
+      break;
+    /* When ":tab" was used open a new tab for a new window repeatedly. */
+    if (had_tab > 0 && tabpage_index(NULL) <= p_tpm)
+      cmdmod.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 = (P_HID(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, !P_HID(wp->w_buffer));
+      --open_wins;
+      wp = lastwin;
+    } else   {
+      wp = wp->w_prev;
+      if (wp == NULL)
+        break;
+    }
+  }
+}
+
+
+static int chk_modeline __ARGS((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(flags)
+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; 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; 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(lnum, flags)
+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;
+  char_u      *save_sourcing_name;
+  linenr_T save_sourcing_lnum;
+  scid_T save_SID;
+
+  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;
+
+    save_sourcing_lnum = sourcing_lnum;
+    save_sourcing_name = sourcing_name;
+    sourcing_lnum = lnum;               /* prepare for emsg() */
+    sourcing_name = (char_u *)"modelines";
+
+    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 "::" */
+        save_SID = current_SID;
+        current_SID = SID_MODELINE;
+        retval = do_set(s, OPT_MODELINE | OPT_LOCAL | flags);
+        current_SID = save_SID;
+        if (retval == FAIL)                     /* stop if error found */
+          break;
+      }
+      s = e + 1;                        /* advance to next part */
+    }
+
+    sourcing_lnum = save_sourcing_lnum;
+    sourcing_name = save_sourcing_name;
+
+    vim_free(linecopy);
+  }
+  return retval;
+}
+
+int read_viminfo_bufferlist(virp, writing)
+vir_T       *virp;
+int writing;
+{
+  char_u      *tab;
+  linenr_T lnum;
+  colnr_T col;
+  buf_T       *buf;
+  char_u      *sfname;
+  char_u      *xline;
+
+  /* Handle long line and escaped characters. */
+  xline = viminfo_readstring(virp, 1, FALSE);
+
+  /* don't read in if there are files on the command-line or if writing: */
+  if (xline != NULL && !writing && ARGCOUNT == 0
+      && find_viminfo_parameter('%') != NULL) {
+    /* Format is: <fname> Tab <lnum> Tab <col>.
+     * Watch out for a Tab in the file name, work from the end. */
+    lnum = 0;
+    col = 0;
+    tab = vim_strrchr(xline, '\t');
+    if (tab != NULL) {
+      *tab++ = '\0';
+      col = (colnr_T)atoi((char *)tab);
+      tab = vim_strrchr(xline, '\t');
+      if (tab != NULL) {
+        *tab++ = '\0';
+        lnum = atol((char *)tab);
+      }
+    }
+
+    /* Expand "~/" in the file name at "line + 1" to a full path.
+     * Then try shortening it by comparing with the current directory */
+    expand_env(xline, NameBuff, MAXPATHL);
+    sfname = shorten_fname1(NameBuff);
+
+    buf = buflist_new(NameBuff, sfname, (linenr_T)0, BLN_LISTED);
+    if (buf != NULL) {          /* just in case... */
+      buf->b_last_cursor.lnum = lnum;
+      buf->b_last_cursor.col = col;
+      buflist_setfpos(buf, curwin, lnum, col, FALSE);
+    }
+  }
+  vim_free(xline);
+
+  return viminfo_readline(virp);
+}
+
+void write_viminfo_bufferlist(fp)
+FILE    *fp;
+{
+  buf_T       *buf;
+  win_T       *win;
+  tabpage_T   *tp;
+  char_u      *line;
+  int max_buffers;
+
+  if (find_viminfo_parameter('%') == NULL)
+    return;
+
+  /* Without a number -1 is returned: do all buffers. */
+  max_buffers = get_viminfo_parameter('%');
+
+  /* Allocate room for the file name, lnum and col. */
+#define LINE_BUF_LEN (MAXPATHL + 40)
+  line = alloc(LINE_BUF_LEN);
+  if (line == NULL)
+    return;
+
+  FOR_ALL_TAB_WINDOWS(tp, win)
+  set_last_cursor(win);
+
+  fputs(_("\n# Buffer list:\n"), fp);
+  for (buf = firstbuf; buf != NULL; buf = buf->b_next) {
+    if (buf->b_fname == NULL
+        || !buf->b_p_bl
+        || bt_quickfix(buf)
+        || removable(buf->b_ffname))
+      continue;
+
+    if (max_buffers-- == 0)
+      break;
+    putc('%', fp);
+    home_replace(NULL, buf->b_ffname, line, MAXPATHL, TRUE);
+    vim_snprintf_add((char *)line, LINE_BUF_LEN, "\t%ld\t%d",
+        (long)buf->b_last_cursor.lnum,
+        buf->b_last_cursor.col);
+    viminfo_writestring(fp, line);
+  }
+  vim_free(line);
+}
+
+
+/*
+ * Return special buffer name.
+ * Returns NULL when the buffer has a normal file name.
+ */
+char_u * buf_spname(buf)
+buf_T       *buf;
+{
+  if (bt_quickfix(buf)) {
+    win_T       *win;
+    tabpage_T   *tp;
+
+    /*
+     * For location list window, w_llist_ref points to the location list.
+     * For quickfix window, w_llist_ref is NULL.
+     */
+    if (find_win_for_buf(buf, &win, &tp) == OK && win->w_llist_ref != NULL)
+      return (char_u *)_(msg_loclist);
+    else
+      return (char_u *)_(msg_qflist);
+  }
+  /* There is no _file_ when 'buftype' is "nofile", b_sfname
+   * contains the name as specified by the user */
+  if (bt_nofile(buf)) {
+    if (buf->b_sfname != NULL)
+      return buf->b_sfname;
+    return (char_u *)_("[Scratch]");
+  }
+  if (buf->b_fname == NULL)
+    return (char_u *)_("[No Name]");
+  return NULL;
+}
+
+#if (defined(FEAT_QUICKFIX) && defined(FEAT_WINDOWS)) \
+  || defined(FEAT_PYTHON) || defined(FEAT_PYTHON3) \
+  || defined(PROTO)
+/*
+ * Find a window for buffer "buf".
+ * If found OK is returned and "wp" and "tp" are set to the window and tabpage.
+ * If not found FAIL is returned.
+ */
+int find_win_for_buf(buf, wp, tp)
+buf_T     *buf;
+win_T     **wp;
+tabpage_T **tp;
+{
+  FOR_ALL_TAB_WINDOWS(*tp, *wp)
+  if ((*wp)->w_buffer == buf)
+    goto win_found;
+  return FAIL;
+win_found:
+  return OK;
+}
+#endif
+
+
+/*
+ * Set 'buflisted' for curbuf to "on" and trigger autocommands if it changed.
+ */
+void set_buflisted(on)
+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)
+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, aucmd)
+buf_T       *buf;
+int aucmd UNUSED;                   /* 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);
+  if (!aucmd)
+    unblock_autocmds();
+}