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scroll.c revision 1.4.2.1 
      1 /*
      2  * Copyright (c) 1981, 1993
      3  *	The Regents of the University of California.  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[] = "@(#)scroll.c	8.2 (Berkeley) 1/9/94";
     36 #endif /* not lint */
     37 
     38 #include <curses.h>
     39 
     40 /*
     41  * scroll --
     42  *	Scroll the window up a line.
     43  */
     44 int
     45 scroll(win)
     46 	register WINDOW *win;
     47 {
     48 	register int oy, ox;
     49 
     50 #ifdef DEBUG
     51 	__CTRACE("scroll: (%0.2o)\n", win);
     52 #endif
     53 
     54 	if (!(win->flags & __SCROLLOK))
     55 		return (ERR);
     56 
     57 	getyx(win, oy, ox);
     58 	wmove(win, 0, 0);
     59 	wdeleteln(win);
     60 	wmove(win, oy, ox);
     61 
     62 	if (win == curscr) {
     63 		putchar('\n');
     64 		if (!NONL)
     65 			win->curx = 0;
     66 #ifdef DEBUG
     67 		__CTRACE("scroll: win == curscr\n");
     68 #endif
     69 	}
     70 	return (OK);
     71 }
     72