ncurses-5.7/panel/p_new.c

/****************************************************************************
 * Copyright (c) 1998-2005,2008 Free Software Foundation, Inc.              *
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 * "Software"), to deal in the Software without restriction, including      *
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/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1995                    *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 *     and: Juergen Pfeifer                         1997-1999               *
 *     and: Thomas E. Dickey                        2000-on                 *
 ****************************************************************************/

/* p_new.c
 * Creation of a new panel 
 */
#include "panel.priv.h"

MODULE_ID("$Id: p_new.c,v 1.10 2008/08/04 18:25:48 tom Exp $")

#ifdef TRACE
static char *stdscr_id;
static char *new_id;
#endif

/*+-------------------------------------------------------------------------
  Get root (i.e. stdscr's) panel.
  Establish the pseudo panel for stdscr if necessary.
--------------------------------------------------------------------------*/
static PANEL *
root_panel(void)
{
  if (_nc_stdscr_pseudo_panel == (PANEL *) 0)
    {

      assert(stdscr && !_nc_bottom_panel && !_nc_top_panel);
#if NO_LEAKS
      _nc_panelhook()->destroy = del_panel;
#endif
      _nc_stdscr_pseudo_panel = (PANEL *) malloc(sizeof(PANEL));
      if (_nc_stdscr_pseudo_panel != 0)
	{
	  PANEL *pan = _nc_stdscr_pseudo_panel;
	  WINDOW *win = stdscr;

	  pan->win = win;
	  pan->below = (PANEL *) 0;
	  pan->above = (PANEL *) 0;
#ifdef TRACE
	  if (!stdscr_id)
	    stdscr_id = strdup("stdscr");
	  pan->user = stdscr_id;
#else
	  pan->user = (void *)0;
#endif
	  _nc_bottom_panel = _nc_top_panel = pan;
	}
    }
  return _nc_stdscr_pseudo_panel;
}

NCURSES_EXPORT(PANEL *)
new_panel(WINDOW *win)
{
  PANEL *pan = (PANEL *) 0;

  T((T_CALLED("new_panel(%p)"), win));

  if (!win)
    returnPanel(pan);

  if (!_nc_stdscr_pseudo_panel)
    (void)root_panel();
  assert(_nc_stdscr_pseudo_panel);

  if (!(win->_flags & _ISPAD) && (pan = (PANEL *) malloc(sizeof(PANEL))))
    {
      pan->win = win;
      pan->above = (PANEL *) 0;
      pan->below = (PANEL *) 0;
#ifdef TRACE
      if (!new_id)
	new_id = strdup("new");
      pan->user = new_id;
#else
      pan->user = (char *)0;
#endif
      (void)show_panel(pan);
    }
  returnPanel(pan);
}