1*86d7f5d3SJohn Marino /* @(#)wwrint.c 8.1 (Berkeley) 6/6/93 */
2*86d7f5d3SJohn Marino /* $NetBSD: wwrint.c,v 1.7 2003/08/07 11:17:44 agc Exp $ */
3*86d7f5d3SJohn Marino
4*86d7f5d3SJohn Marino /*
5*86d7f5d3SJohn Marino * Copyright (c) 1983, 1993
6*86d7f5d3SJohn Marino * The Regents of the University of California. All rights reserved.
7*86d7f5d3SJohn Marino *
8*86d7f5d3SJohn Marino * This code is derived from software contributed to Berkeley by
9*86d7f5d3SJohn Marino * Edward Wang at The University of California, Berkeley.
10*86d7f5d3SJohn Marino *
11*86d7f5d3SJohn Marino * Redistribution and use in source and binary forms, with or without
12*86d7f5d3SJohn Marino * modification, are permitted provided that the following conditions
13*86d7f5d3SJohn Marino * are met:
14*86d7f5d3SJohn Marino * 1. Redistributions of source code must retain the above copyright
15*86d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer.
16*86d7f5d3SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
17*86d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer in the
18*86d7f5d3SJohn Marino * documentation and/or other materials provided with the distribution.
19*86d7f5d3SJohn Marino * 3. Neither the name of the University nor the names of its contributors
20*86d7f5d3SJohn Marino * may be used to endorse or promote products derived from this software
21*86d7f5d3SJohn Marino * without specific prior written permission.
22*86d7f5d3SJohn Marino *
23*86d7f5d3SJohn Marino * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24*86d7f5d3SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25*86d7f5d3SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26*86d7f5d3SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27*86d7f5d3SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28*86d7f5d3SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29*86d7f5d3SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30*86d7f5d3SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31*86d7f5d3SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32*86d7f5d3SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33*86d7f5d3SJohn Marino * SUCH DAMAGE.
34*86d7f5d3SJohn Marino */
35*86d7f5d3SJohn Marino
36*86d7f5d3SJohn Marino #include <unistd.h>
37*86d7f5d3SJohn Marino #include "ww.h"
38*86d7f5d3SJohn Marino #include "tt.h"
39*86d7f5d3SJohn Marino
40*86d7f5d3SJohn Marino /*
41*86d7f5d3SJohn Marino * Tty input interrupt handler.
42*86d7f5d3SJohn Marino * (1) Read input into buffer (wwib*).
43*86d7f5d3SJohn Marino * (2) Set the interrupt flag if anything is read.
44*86d7f5d3SJohn Marino * Currently, the last is used to get out of the blocking
45*86d7f5d3SJohn Marino * select() in wwiomux().
46*86d7f5d3SJohn Marino * To avoid race conditions, we only modify wwibq in here, except
47*86d7f5d3SJohn Marino * when the buffer is empty; and everywhere else, we only change wwibp.
48*86d7f5d3SJohn Marino * It should be completely safe.
49*86d7f5d3SJohn Marino */
50*86d7f5d3SJohn Marino void
wwrint(void)51*86d7f5d3SJohn Marino wwrint(void)
52*86d7f5d3SJohn Marino {
53*86d7f5d3SJohn Marino int n;
54*86d7f5d3SJohn Marino
55*86d7f5d3SJohn Marino wwnread++;
56*86d7f5d3SJohn Marino n = read(0, wwibq, wwibe - wwibq);
57*86d7f5d3SJohn Marino if (n > 0) {
58*86d7f5d3SJohn Marino if (tt.tt_rint)
59*86d7f5d3SJohn Marino n = (*tt.tt_rint)(wwibq, n);
60*86d7f5d3SJohn Marino if (n > 0) {
61*86d7f5d3SJohn Marino wwibq += n;
62*86d7f5d3SJohn Marino wwnreadc += n;
63*86d7f5d3SJohn Marino /*
64*86d7f5d3SJohn Marino * Hasten or delay the next checkpoint,
65*86d7f5d3SJohn Marino * as the case may be.
66*86d7f5d3SJohn Marino */
67*86d7f5d3SJohn Marino if (tt.tt_checkpoint && !wwdocheckpoint)
68*86d7f5d3SJohn Marino (void) alarm(1);
69*86d7f5d3SJohn Marino wwsetintr();
70*86d7f5d3SJohn Marino }
71*86d7f5d3SJohn Marino } else if (n == 0)
72*86d7f5d3SJohn Marino wwnreadz++;
73*86d7f5d3SJohn Marino else
74*86d7f5d3SJohn Marino wwnreade++;
75*86d7f5d3SJohn Marino }
76