1 /* $NetBSD: scroll.c,v 1.29 2024/12/23 02:58:04 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. 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 1.29 2024/12/23 02:58:04 blymn 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 /* 80 * getscrreg -- 81 * Get the top and bottom of the scrolling region for stdscr. 82 */ 83 int 84 getscrreg(int *top, int *bottom) 85 { 86 87 return wgetscrreg(stdscr, top, bottom); 88 } 89 90 #endif 91 92 /* 93 * wscrl -- 94 * Scroll a window n lines - up if n is positive, down if n is negative. 95 */ 96 int 97 wscrl(WINDOW *win, int nlines) 98 { 99 int oy, ox; 100 101 __CTRACE(__CTRACE_WINDOW, "wscrl: (%p) lines=%d\n", win, nlines); 102 103 if (__predict_false(win == NULL)) 104 return ERR; 105 106 if (!(win->flags & __SCROLLOK)) 107 return ERR; 108 if (!nlines) 109 return OK; 110 111 getyx(win, oy, ox); 112 __CTRACE(__CTRACE_WINDOW, "wscrl: y=%d\n", oy); 113 wmove(win, win->scr_t, 1); 114 winsdelln(win, 0 - nlines); 115 wmove(win, oy, ox); 116 117 if (win == curscr) { 118 __cputchar('\n'); 119 if (!__NONL) 120 win->curx = 0; 121 __CTRACE(__CTRACE_WINDOW, "scroll: win == curscr\n"); 122 } 123 return OK; 124 } 125 126 /* 127 * wsetscrreg -- 128 * Set the top and bottom of the scrolling region for win. 129 */ 130 int 131 wsetscrreg(WINDOW *win, int top, int bottom) 132 { 133 if (__predict_false(win == NULL)) 134 return ERR; 135 136 if (top < 0 || bottom >= win->maxy || bottom - top < 1) 137 return ERR; 138 win->scr_t = top; 139 win->scr_b = bottom; 140 return OK; 141 } 142 143 /* 144 * wgetscrreg -- 145 * Get the top and bottom of the scrolling region for win. 146 */ 147 int 148 wgetscrreg(WINDOW *win, int *top, int *bottom) 149 { 150 if (__predict_false(win == NULL)) 151 return ERR; 152 153 *top = win->scr_t; 154 *bottom = win->scr_b; 155 return OK; 156 } 157 158 /* 159 * has_ic -- 160 * Does the terminal have insert- and delete-character? 161 */ 162 bool 163 has_ic(void) 164 { 165 166 if (insert_character != NULL && delete_character != NULL) 167 return true; 168 else 169 return false; 170 } 171 172 /* 173 * has_ic -- 174 * Does the terminal have insert- and delete-line? 175 */ 176 bool 177 has_il(void) 178 { 179 if (insert_line !=NULL && delete_line != NULL) 180 return true; 181 else 182 return false; 183 } 184