1/*	$NetBSD: wwrint.c,v 1.6 2002/06/14 01:07:01 wiz 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[] = "@(#)wwrint.c	8.1 (Berkeley) 6/6/93";
39#else
40__RCSID("$NetBSD: wwrint.c,v 1.6 2002/06/14 01:07:01 wiz Exp $");
41#endif
42#endif /* not lint */
43
44#include <unistd.h>
45#include "ww.h"
46#include "tt.h"
47
48/*
49 * Tty input interrupt handler.
50 * (1) Read input into buffer (wwib*).
51 * (2) Set the interrupt flag if anything is read.
52 * Currently, the last is used to get out of the blocking
53 * select() in wwiomux().
54 * To avoid race conditions, we only modify wwibq in here, except
55 * when the buffer is empty; and everywhere else, we only change wwibp.
56 * It should be completely safe.
57 */
58void
59wwrint(void)
60{
61	int n;
62
63	wwnread++;
64	n = read(0, wwibq, wwibe - wwibq);
65	if (n > 0) {
66		if (tt.tt_rint)
67			n = (*tt.tt_rint)(wwibq, n);
68		if (n > 0) {
69			wwibq += n;
70			wwnreadc += n;
71			/*
72			 * Hasten or delay the next checkpoint,
73			 * as the case may be.
74			 */
75			if (tt.tt_checkpoint && !wwdocheckpoint)
76				(void) alarm(1);
77			wwsetintr();
78		}
79	} else if (n == 0)
80		wwnreadz++;
81	else
82		wwnreade++;
83}
84