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touchwin.c revision 1.19 
      1 /*	$NetBSD: touchwin.c,v 1.19 2003/08/07 16:44:24 agc 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[] = "@(#)touchwin.c	8.2 (Berkeley) 5/4/94";
     36 #else
     37 __RCSID("$NetBSD: touchwin.c,v 1.19 2003/08/07 16:44:24 agc Exp $");
     38 #endif
     39 #endif				/* not lint */
     40 
     41 #include "curses.h"
     42 #include "curses_private.h"
     43 
     44 /*
     45  * is_linetouched --
     46  *    Indicate if line has been touched or not.
     47  */
     48 bool
     49 is_linetouched(WINDOW *win, int line)
     50 {
     51 	if (line > win->maxy)
     52 		return FALSE;
     53 
     54 	return ((win->lines[line]->flags & __ISDIRTY) != 0);
     55 }
     56 
     57 
     58 /*
     59  * Touch count lines starting at start.  This is the SUS v2 compliant
     60  * version.
     61  */
     62 
     63 int
     64 touchline(WINDOW *win, int start, int count)
     65 {
     66 	return wtouchln(win, start, count, 1);
     67 }
     68 
     69 /*
     70  * is_wintouched --
     71  *      Check if the window has been touched.
     72  */
     73 bool
     74 is_wintouched(WINDOW *win)
     75 {
     76 	int y, maxy;
     77 
     78 	maxy = win->maxy;
     79 	for (y = 0; y < maxy; y++) {
     80 		if (is_linetouched(win, y) == TRUE)
     81 			return TRUE;
     82 	}
     83 
     84 	return FALSE;
     85 }
     86 
     87 /*
     88  * touchwin --
     89  *	Make it look like the whole window has been changed.
     90  */
     91 int
     92 touchwin(WINDOW *win)
     93 {
     94 #ifdef DEBUG
     95 	__CTRACE("touchwin: (%p)\n", win);
     96 #endif
     97 	return wtouchln(win, 0, win->maxy, 1);
     98 }
     99 
    100 /*
    101  * untouchwin --
    102  *     Make it look like the window has not been changed.
    103  */
    104 int
    105 untouchwin(WINDOW *win)
    106 {
    107 	return wtouchln(win, 0, win->maxy, 0);
    108 }
    109 
    110 /*
    111  * wtouchln --
    112  *     If changed is 1 then touch n lines starting at line.  If changed
    113  *     is 0 then mark the lines as unchanged.
    114  */
    115 int
    116 wtouchln(WINDOW *win, int line, int n, int changed)
    117 {
    118 	int	y;
    119 	__LINE	*wlp;
    120 
    121 #ifdef DEBUG
    122 	__CTRACE("wtouchln: (%p) %d, %d, %d\n", win, line, n, changed);
    123 #endif
    124 	for (y = line; y < line + n; y++) {
    125 		if (changed == 1)
    126 			__touchline(win, y, 0, (int) win->maxx - 1);
    127 		else {
    128 			wlp = win->lines[y];
    129 			if (*wlp->firstchp >= win->ch_off &&
    130 			    *wlp->firstchp < win->maxx + win->ch_off)
    131 				*wlp->firstchp = win->maxx + win->ch_off;
    132 			if (*wlp->lastchp >= win->ch_off &&
    133 			    *wlp->lastchp < win->maxx + win->ch_off)
    134 				*wlp->lastchp = win->ch_off;
    135 			wlp->flags &= ~__ISDIRTY;
    136 		}
    137 	}
    138 
    139 	return OK;
    140 }
    141 
    142 
    143 int
    144 __touchwin(WINDOW *win)
    145 {
    146 	int     y, maxy;
    147 
    148 #ifdef DEBUG
    149 	__CTRACE("touchwin: (%p)\n", win);
    150 #endif
    151 	maxy = win->maxy;
    152 	for (y = 0; y < maxy; y++)
    153 		__touchline(win, y, 0, (int) win->maxx - 1);
    154 	return (OK);
    155 }
    156 
    157 int
    158 __touchline(WINDOW *win, int y, int sx, int ex)
    159 {
    160 #ifdef DEBUG
    161 	__CTRACE("touchline: (%p, %d, %d, %d)\n", win, y, sx, ex);
    162 	__CTRACE("touchline: first = %d, last = %d\n",
    163 	    *win->lines[y]->firstchp, *win->lines[y]->lastchp);
    164 #endif
    165 	sx += win->ch_off;
    166 	ex += win->ch_off;
    167 	if (!(win->lines[y]->flags & __ISDIRTY))
    168 		win->lines[y]->flags |= __ISDIRTY;
    169 	/* firstchp/lastchp are shared between parent window and sub-window. */
    170 	if (*win->lines[y]->firstchp > sx)
    171 		*win->lines[y]->firstchp = sx;
    172 	if (*win->lines[y]->lastchp < ex)
    173 		*win->lines[y]->lastchp = ex;
    174 #ifdef DEBUG
    175 	__CTRACE("touchline: first = %d, last = %d\n",
    176 	    *win->lines[y]->firstchp, *win->lines[y]->lastchp);
    177 #endif
    178 	return (OK);
    179 }
    180