1 /* $NetBSD: scroll.c,v 1.23 2017/01/06 13:53:18 roy 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 35 static char sccsid[] = "@(#)scroll.c 8.3 (Berkeley) 5/4/94"; 36 #else 37 __RCSID("$NetBSD: scroll.c,v 1.23 2017/01/06 13:53:18 roy 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 */ 48 int 49 scroll(WINDOW *win) 50 { 51 52 return wscrl(win, 1); 53 } 54 55 #ifndef _CURSES_USE_MACROS 56 57 /* 58 * scrl -- 59 * Scroll stdscr n lines - up if n is positive, down if n is negative. 60 */ 61 int 62 scrl(int nlines) 63 { 64 65 return wscrl(stdscr, nlines); 66 } 67 68 /* 69 * setscrreg -- 70 * Set the top and bottom of the scrolling region for stdscr. 71 */ 72 int 73 setscrreg(int top, int bottom) 74 { 75 76 return wsetscrreg(stdscr, top, bottom); 77 } 78 79 #endif 80 81 /* 82 * wscrl -- 83 * Scroll a window n lines - up if n is positive, down if n is negative. 84 */ 85 int 86 wscrl(WINDOW *win, int nlines) 87 { 88 int oy, ox; 89 90 #ifdef DEBUG 91 __CTRACE(__CTRACE_WINDOW, "wscrl: (%p) lines=%d\n", win, nlines); 92 #endif 93 94 if (!(win->flags & __SCROLLOK)) 95 return ERR; 96 if (!nlines) 97 return OK; 98 99 getyx(win, oy, ox); 100 #ifdef DEBUG 101 __CTRACE(__CTRACE_WINDOW, "wscrl: y=%d\n", oy); 102 #endif 103 if (oy < win->scr_t || oy > win->scr_b) 104 /* Outside scrolling region */ 105 wmove(win, 0, 0); 106 else 107 /* Inside scrolling region */ 108 wmove(win, win->scr_t, 0); 109 winsdelln(win, 0 - nlines); 110 wmove(win, oy, ox); 111 112 if (win == curscr) { 113 __cputchar('\n'); 114 if (!__NONL) 115 win->curx = 0; 116 #ifdef DEBUG 117 __CTRACE(__CTRACE_WINDOW, "scroll: win == curscr\n"); 118 #endif 119 } 120 return OK; 121 } 122 123 /* 124 * wsetscrreg -- 125 * Set the top and bottom of the scrolling region for win. 126 */ 127 int 128 wsetscrreg(WINDOW *win, int top, int bottom) 129 { 130 if (top < 0 || bottom >= win->maxy || bottom - top < 1) 131 return ERR; 132 win->scr_t = top; 133 win->scr_b = bottom; 134 return OK; 135 } 136 137 /* 138 * has_ic -- 139 * Does the terminal have insert- and delete-character? 140 */ 141 bool 142 has_ic(void) 143 { 144 145 if (insert_character != NULL && delete_character != NULL) 146 return true; 147 else 148 return false; 149 } 150 151 /* 152 * has_ic -- 153 * Does the terminal have insert- and delete-line? 154 */ 155 bool 156 has_il(void) 157 { 158 if (insert_line !=NULL && delete_line != NULL) 159 return true; 160 else 161 return false; 162 } 163