1 /* $NetBSD: scroll.c,v 1.22 2010/02/03 15:34:40 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 1.22 2010/02/03 15:34:40 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
scroll(WINDOW * win)49 scroll(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 */
60 int
scrl(int nlines)61 scrl(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 */
70 int
setscrreg(int top,int bottom)71 setscrreg(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 */
82 int
wscrl(WINDOW * win,int nlines)83 wscrl(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 */
124 int
wsetscrreg(WINDOW * win,int top,int bottom)125 wsetscrreg(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 */
138 bool
has_ic(void)139 has_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 */
151 bool
has_il(void)152 has_il(void)
153 {
154 if (insert_line !=NULL && delete_line != NULL)
155 return (TRUE);
156 else
157 return (FALSE);
158 }
159