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scroll.c revision 1.3 
      1 /*
      2  * Copyright (c) 1981 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 /*static char sccsid[] = "from: @(#)scroll.c	5.6 (Berkeley) 8/31/92";*/
     36 static char rcsid[] = "$Id: scroll.c,v 1.3 1993/08/07 05:49:06 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 #include <curses.h>
     40 #include <termios.h>
     41 
     42 /*
     43  * scroll --
     44  *	Scroll the window up a line.
     45  */
     46 int
     47 scroll(win)
     48 	register WINDOW *win;
     49 {
     50 	register int oy, ox;
     51 
     52 #ifdef DEBUG
     53 	__TRACE("scroll: (%0.2o)\n", win);
     54 #endif
     55 
     56 	if (!win->_scroll)
     57 		return (ERR);
     58 
     59 	getyx(win, oy, ox);
     60 	wmove(win, 0, 0);
     61 	wdeleteln(win);
     62 	wmove(win, oy, ox);
     63 
     64 	if (win == curscr) {
     65 		putchar('\n');
     66 		if (origtermio.c_oflag & ONLCR)
     67 			win->_curx = 0;
     68 #ifdef DEBUG
     69 		__TRACE("scroll: win == curscr\n");
     70 #endif
     71 	}
     72 	return (OK);
     73 }
     74