1 /* $OpenBSD: wwrint.c,v 1.8 2005/04/13 02:33:09 deraadt Exp $ */
2 /* $NetBSD: wwrint.c,v 1.4 1995/12/21 10:46:24 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[] = "@(#)wwrint.c 8.1 (Berkeley) 6/6/93";
39 #else
40 static char rcsid[] = "$OpenBSD: wwrint.c,v 1.8 2005/04/13 02:33:09 deraadt Exp $";
41 #endif
42 #endif /* not lint */
43
44 #include "ww.h"
45 #include "tt.h"
46 #include <sys/types.h>
47 #include <unistd.h>
48
49 /*
50 * Tty input interrupt handler.
51 * (1) Read input into buffer (wwib*).
52 * (2) Set the interrupt flag if anything is read.
53 * Currently, the last is used to get out of the blocking
54 * select() in wwiomux().
55 * To avoid race conditions, we only modify wwibq in here, except
56 * when the buffer is empty; and everywhere else, we only change wwibp.
57 * It should be completely safe.
58 */
59 void
wwrint()60 wwrint()
61 {
62 int n;
63
64 wwnread++;
65 n = read(STDIN_FILENO, wwibq, wwibe - wwibq);
66 if (n > 0) {
67 if (tt.tt_rint)
68 n = (*tt.tt_rint)(wwibq, n);
69 if (n > 0) {
70 wwibq += n;
71 wwnreadc += n;
72 /*
73 * Hasten or delay the next checkpoint,
74 * as the case may be.
75 */
76 if (tt.tt_checkpoint && !wwdocheckpoint)
77 (void) alarm(1);
78 wwsetintr();
79 }
80 } else if (n == 0)
81 wwnreadz++;
82 else
83 wwnreade++;
84 }
85