1/* $NetBSD: scroll.c,v 1.21 2009/07/28 18:38:43 christos 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33#ifndef lint 34#if 0 35static char sccsid[] = "@(#)scroll.c 8.3 (Berkeley) 5/4/94"; 36#else 37__RCSID("$NetBSD: scroll.c,v 1.21 2009/07/28 18:38:43 christos Exp $"); 38#endif 39#endif /* not lint */ 40 41#include "curses.h" 42#include "curses_private.h" 43 44/* 45 * scroll -- 46 * Scroll the window up a line. 47 */ 48int 49scroll(WINDOW *win) 50{ 51 return(wscrl(win, 1)); 52} 53 54#ifndef _CURSES_USE_MACROS 55 56/* 57 * scrl -- 58 * Scroll stdscr n lines - up if n is positive, down if n is negative. 59 */ 60int 61scrl(int nlines) 62{ 63 return wscrl(stdscr, nlines); 64} 65 66/* 67 * setscrreg -- 68 * Set the top and bottom of the scrolling region for stdscr. 69 */ 70int 71setscrreg(int top, int bottom) 72{ 73 return wsetscrreg(stdscr, top, bottom); 74} 75 76#endif 77 78/* 79 * wscrl -- 80 * Scroll a window n lines - up if n is positive, down if n is negative. 81 */ 82int 83wscrl(WINDOW *win, int nlines) 84{ 85 int oy, ox; 86 87#ifdef DEBUG 88 __CTRACE(__CTRACE_WINDOW, "wscrl: (%p) lines=%d\n", win, nlines); 89#endif 90 91 if (!(win->flags & __SCROLLOK)) 92 return (ERR); 93 if (!nlines) 94 return (OK); 95 96 getyx(win, oy, ox); 97#ifdef DEBUG 98 __CTRACE(__CTRACE_WINDOW, "wscrl: y=%d\n", oy); 99#endif 100 if (oy < win->scr_t || oy > win->scr_b) 101 /* Outside scrolling region */ 102 wmove(win, 0, 0); 103 else 104 /* Inside scrolling region */ 105 wmove(win, win->scr_t, 0); 106 winsdelln(win, 0 - nlines); 107 wmove(win, oy, ox); 108 109 if (win == curscr) { 110 __cputchar('\n'); 111 if (!__NONL) 112 win->curx = 0; 113#ifdef DEBUG 114 __CTRACE(__CTRACE_WINDOW, "scroll: win == curscr\n"); 115#endif 116 } 117 return (OK); 118} 119 120/* 121 * wsetscrreg -- 122 * Set the top and bottom of the scrolling region for win. 123 */ 124int 125wsetscrreg(WINDOW *win, int top, int bottom) 126{ 127 if (top < 0 || bottom >= win->maxy || bottom - top < 1) 128 return (ERR); 129 win->scr_t = top; 130 win->scr_b = bottom; 131 return (OK); 132} 133 134/* 135 * has_ic -- 136 * Does the terminal have insert- and delete-character? 137 */ 138bool 139has_ic(void) 140{ 141 if (insert_character != NULL && delete_character != NULL) 142 return (TRUE); 143 else 144 return (FALSE); 145} 146 147/* 148 * has_ic -- 149 * Does the terminal have insert- and delete-line? 150 */ 151bool 152has_il(void) 153{ 154 if (insert_line !=NULL && delete_line != NULL) 155 return (TRUE); 156 else 157 return (FALSE); 158} 159