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scroll.c revision 1.20 
      1 /*	$NetBSD: scroll.c,v 1.20 2009/07/22 16:57:15 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 1.20 2009/07/22 16:57:15 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 	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
     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
     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
     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, lines);
     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
    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
    139 has_ic(void)
    140 {
    141 	if (__tc_ic !=NULL && __tc_dc != 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
    152 has_il(void)
    153 {
    154 	if (__tc_al !=NULL && __tc_dl != NULL)
    155 		return (TRUE);
    156 	else
    157 		return (FALSE);
    158 }
    159