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
scroll(WINDOW * win)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
scrl(int nlines)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
setscrreg(int top,int bottom)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
getscrreg(int * top,int * bottom)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
wscrl(WINDOW * win,int nlines)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
wsetscrreg(WINDOW * win,int top,int bottom)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
wgetscrreg(WINDOW * win,int * top,int * bottom)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
has_ic(void)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
has_il(void)177 has_il(void)
178 {
179 if (insert_line !=NULL && delete_line != NULL)
180 return true;
181 else
182 return false;
183 }
184