1/*	$NetBSD: wwflush.c,v 1.9 2003/08/07 11:17:39 agc Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Edward Wang at The University of California, Berkeley.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)wwflush.c	8.1 (Berkeley) 6/6/93";
39#else
40__RCSID("$NetBSD: wwflush.c,v 1.9 2003/08/07 11:17:39 agc Exp $");
41#endif
42#endif /* not lint */
43
44#include <signal.h>
45#include <string.h>
46#include <unistd.h>
47#include "ww.h"
48#include "tt.h"
49#include "xx.h"
50
51void
52wwflush(void)
53{
54	int row, col;
55
56	if ((row = wwcursorrow) < 0)
57		row = 0;
58	else if (row >= wwnrow)
59		row = wwnrow - 1;
60	if ((col = wwcursorcol) < 0)
61		col = 0;
62	else if (col >= wwncol)
63		col = wwncol - 1;
64	xxmove(row, col);
65	if (wwdocheckpoint) {
66		xxflush(0);
67		wwcheckpoint();
68	} else
69		xxflush(1);
70}
71
72void
73wwcheckpoint(void)
74{
75	sigset_t nsigset, osigset;
76
77	sigemptyset(&nsigset);
78	sigaddset(&nsigset, SIGALRM);
79	sigprocmask(SIG_BLOCK, &nsigset, &osigset);
80
81	tt.tt_ack = 0;
82	do {
83		(*tt.tt_checkpoint)();
84#ifndef OLD_TTY
85		(void) tcdrain(1);
86#endif
87		(void) alarm(3);
88		for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;)
89			sigsuspend(&osigset);
90	} while (tt.tt_ack == 0);
91	(void) alarm(0);
92	wwdocheckpoint = 0;
93	if (tt.tt_ack < 0) {
94		wwcopyscreen(wwcs, wwos);
95		(void) alarm(1);
96		wwreset();
97		wwupdate();
98		wwflush();
99	} else {
100		wwcopyscreen(wwos, wwcs);
101		(void) alarm(3);
102	}
103
104	sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
105}
106
107void
108wwcopyscreen(union ww_char **s1, union ww_char **s2)
109{
110	int i;
111	int s = wwncol * sizeof **s1;
112
113	for (i = wwnrow; --i >= 0;)
114		memmove((char *) *s2++, (char *) *s1++, s);
115}
116
117void
118wwalarm(int dummy __unused)
119{
120	wwdocheckpoint = 1;
121}
122