1 /* $NetBSD: scroll.c,v 1.12 2000/04/15 13:17:04 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 1.12 2000/04/15 13:17:04 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(WINDOW *win) 54 { 55 return(wscrl(win, 1)); 56 } 57 58 #ifndef _CURSES_USE_MACROS 59 60 /* 61 * scrl -- 62 * Scroll stdscr n lines - up if n is positive, down if n is negative. 63 */ 64 int 65 scrl(int lines) 66 { 67 return wscrl(stdscr, lines); 68 } 69 70 #endif 71 72 /* 73 * wscrl -- 74 * Scroll a window n lines - up if n is positive, down if n is negative. 75 */ 76 int 77 wscrl(WINDOW *win, int lines) 78 { 79 int oy, ox; 80 81 #ifdef DEBUG 82 __CTRACE("wscrl: (%0.2o) lines=%d\n", win, lines); 83 #endif 84 85 if (!(win->flags & __SCROLLOK)) 86 return (ERR); 87 if (!lines) 88 return (OK); 89 90 getyx(win, oy, ox); 91 wmove(win, 0, 0); 92 winsdelln(win, 0 - lines); 93 wmove(win, oy, ox); 94 95 if (win == curscr) { 96 putchar('\n'); 97 if (!NONL) 98 win->curx = 0; 99 #ifdef DEBUG 100 __CTRACE("scroll: win == curscr\n"); 101 #endif 102 } 103 return (OK); 104 } 105