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scroll.c revision 1.11 
      1 /*	$NetBSD: scroll.c,v 1.11 2000/04/11 13:57:10 blymn Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1981, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)scroll.c	8.3 (Berkeley) 5/4/94";
     40 #else
     41 __RCSID("$NetBSD: scroll.c,v 1.11 2000/04/11 13:57:10 blymn Exp $");
     42 #endif
     43 #endif				/* not lint */
     44 
     45 #include "curses.h"
     46 #include "curses_private.h"
     47 
     48 /*
     49  * scroll --
     50  *	Scroll the window up a line.
     51  */
     52 int
     53 scroll(win)
     54 	WINDOW *win;
     55 {
     56 	return(wscrl(win, 1));
     57 }
     58 
     59 /*
     60  * wscrl --
     61  *	Scroll a window n lines - up if n is positive, down if n is negative.
     62  */
     63 int
     64 wscrl(win, lines)
     65 	WINDOW *win;
     66 	int	lines;
     67 {
     68 	int     oy, ox;
     69 
     70 #ifdef DEBUG
     71 	__CTRACE("wscrl: (%0.2o) lines=%d\n", win, lines);
     72 #endif
     73 
     74 	if (!(win->flags & __SCROLLOK))
     75 		return (ERR);
     76 	if (!lines)
     77 		return (OK);
     78 
     79 	getyx(win, oy, ox);
     80 	wmove(win, 0, 0);
     81 	winsdelln(win, 0 - lines);
     82 	wmove(win, oy, ox);
     83 
     84 	if (win == curscr) {
     85 		putchar('\n');
     86 		if (!NONL)
     87 			win->curx = 0;
     88 #ifdef DEBUG
     89 		__CTRACE("scroll: win == curscr\n");
     90 #endif
     91 	}
     92 	return (OK);
     93 }
     94