1 /* $OpenBSD: wwflush.c,v 1.8 2003/08/01 22:01:37 david Exp $ */
2 /* $NetBSD: wwflush.c,v 1.5 1995/12/21 10:46:08 mycroft Exp $ */
3
4 /*
5 * Copyright (c) 1983, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Edward Wang at The University of California, Berkeley.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)wwflush.c 8.1 (Berkeley) 6/6/93";
39 #else
40 static char rcsid[] = "$OpenBSD: wwflush.c,v 1.8 2003/08/01 22:01:37 david Exp $";
41 #endif
42 #endif /* not lint */
43
44 #include "ww.h"
45 #include "tt.h"
46 #include <sys/signal.h>
47 #include <signal.h>
48 #include <string.h>
49 #include <unistd.h>
50
wwflush()51 wwflush()
52 {
53 int row, col;
54
55 if ((row = wwcursorrow) < 0)
56 row = 0;
57 else if (row >= wwnrow)
58 row = wwnrow - 1;
59 if ((col = wwcursorcol) < 0)
60 col = 0;
61 else if (col >= wwncol)
62 col = wwncol - 1;
63 xxmove(row, col);
64 if (wwdocheckpoint) {
65 xxflush(0);
66 wwcheckpoint();
67 } else
68 xxflush(1);
69 }
70
wwcheckpoint()71 wwcheckpoint()
72 {
73 sigset_t sigset, osigset;
74
75 sigemptyset(&sigset);
76 sigaddset(&sigset, SIGALRM);
77 sigprocmask(SIG_BLOCK, &sigset, &osigset);
78
79 tt.tt_ack = 0;
80 do {
81 (*tt.tt_checkpoint)();
82 #ifndef OLD_TTY
83 (void) tcdrain(1);
84 #endif
85 (void) alarm(3);
86 for (wwdocheckpoint = 0; !wwdocheckpoint && tt.tt_ack == 0;)
87 sigsuspend(&osigset);
88 } while (tt.tt_ack == 0);
89 (void) alarm(0);
90 wwdocheckpoint = 0;
91 if (tt.tt_ack < 0) {
92 wwcopyscreen(wwcs, wwos);
93 (void) alarm(1);
94 wwreset();
95 wwupdate();
96 wwflush();
97 } else {
98 wwcopyscreen(wwos, wwcs);
99 (void) alarm(3);
100 }
101
102 sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
103 }
104
105 wwcopyscreen(s1, s2)
106 union ww_char **s1, **s2;
107 {
108 int i;
109 int s = wwncol * sizeof **s1;
110
111 for (i = wwnrow; --i >= 0;)
112 memmove((char *) *s2++, (char *) *s1++, s);
113 }
114
115 void
wwalarm()116 wwalarm()
117 {
118 wwdocheckpoint = 1;
119 }
120