text: /*
   * CDDL HEADER START
   *
   * The contents of this file are subject to the terms of the
   * Common Development and Distribution License, Version 1.0 only
   * (the "License").  You may not use this file except in compliance
   * with the License.
   *
   * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   * or http://www.opensolaris.org/os/licensing.
   * See the License for the specific language governing permissions
   * and limitations under the License.
   *
   * When distributing Covered Code, include this CDDL HEADER in each
   * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   * If applicable, add the following below this CDDL HEADER, with the
   * fields enclosed by brackets "[]" replaced with your own identifying
   * information: Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1995, by Sun Microsystems, Inc.
   * All rights reserved.
   */
  
  #pragma ident	"%Z%%M%	%I%	%E% SMI"
  
  /*
   * winsdel.c		
   *
   * XCurses Library
   *
   * Copyright 1990, 1995 by Mortice Kern Systems.  All rights reserved.
   *
   */
  
  #ifdef M_RCSID
  #ifndef lint
  static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/winsdel.c 1.4 1995/06/21 20:31:02 ant Exp $";
  #endif
  #endif
  
  #include <private.h>
  #include <stdlib.h>
  
  /*f
   * Insert/delete rows from a window.
   *
   * Positive N inserts rows and negative N deletes.  The size of the
   * window remains fixed so that rows insert/deleted will cause rows to
   * disappear/appear at the end of the window.
   *
   * NOTE: This routine called in doupdate.c with curscr as window.  
   */
  int
  winsdelln(w, n)
  WINDOW *w;
  int n;
  {
  	int row;
  
  #ifdef M_CURSES_TRACE
  	__m_trace("winsdelln(%p, %d)", w, n);
  #endif
  
  	/* Check bounds and limit if necessary. */
  	if (w->_maxy < w->_cury + abs(n))
  		n = (w->_maxy - w->_cury + 1) * (n < 0 ? -1 : 1);
  
  	/* Insert/delete accomplished by pointer shuffling. */
  	if (n < 0) {
  		/* Delete n lines from current cursor line. */
  		(void) __m_ptr_move(
  			(void **) w->_line, w->_maxy, 
  			w->_cury, w->_cury - (n+1), w->_maxy
  		);
  
  		/* Blank lines come in at the bottom of the screen. */
  		row = w->_maxy + n;
  	} else {
  		/* Insert n lines before current cursor line. */
  		(void) __m_ptr_move(
  			(void **) w->_line, w->_maxy, 
  			w->_maxy - n, w->_maxy-1, w->_cury
  		);
  
  		/* Blank lines inserted at the cursor line. */
  		row = w->_cury;
  	}
  
  	/* Clear inserted/deleted lines. */ 
  	(void) __m_cc_erase(w, row, 0, row + abs(n), w->_maxx-1);
  
  	/* Mark from the cursor line to the end of window as dirty. */ 
  	(void) wtouchln(w, w->_cury, w->_maxy - w->_cury, 1);
  
  	/* If we insert/delete lines at the top of the screen and we're,
  	 * permitted to scroll, then treat the action as a scroll.
  	 */
  	if (w->_scroll && w->_cury == 0 && n != 0 && (w->_flags & W_FULL_WINDOW)
  	&& w->_top == 0 && w->_bottom == w->_maxy)
                  w->_scroll += n;
          else
                  w->_scroll = 0;
  
  	WSYNC(w);
  
  	return __m_return_code("winsdelln", WFLUSH(w));
  }
  
  