186d7f5d3SJohn Marino /* @(#)wwrint.c 8.1 (Berkeley) 6/6/93 */
286d7f5d3SJohn Marino /* $NetBSD: wwrint.c,v 1.7 2003/08/07 11:17:44 agc Exp $ */
386d7f5d3SJohn Marino
486d7f5d3SJohn Marino /*
586d7f5d3SJohn Marino * Copyright (c) 1983, 1993
686d7f5d3SJohn Marino * The Regents of the University of California. All rights reserved.
786d7f5d3SJohn Marino *
886d7f5d3SJohn Marino * This code is derived from software contributed to Berkeley by
986d7f5d3SJohn Marino * Edward Wang at The University of California, Berkeley.
1086d7f5d3SJohn Marino *
1186d7f5d3SJohn Marino * Redistribution and use in source and binary forms, with or without
1286d7f5d3SJohn Marino * modification, are permitted provided that the following conditions
1386d7f5d3SJohn Marino * are met:
1486d7f5d3SJohn Marino * 1. Redistributions of source code must retain the above copyright
1586d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer.
1686d7f5d3SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
1786d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer in the
1886d7f5d3SJohn Marino * documentation and/or other materials provided with the distribution.
1986d7f5d3SJohn Marino * 3. Neither the name of the University nor the names of its contributors
2086d7f5d3SJohn Marino * may be used to endorse or promote products derived from this software
2186d7f5d3SJohn Marino * without specific prior written permission.
2286d7f5d3SJohn Marino *
2386d7f5d3SJohn Marino * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
2486d7f5d3SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2586d7f5d3SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2686d7f5d3SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2786d7f5d3SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2886d7f5d3SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2986d7f5d3SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3086d7f5d3SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
3186d7f5d3SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
3286d7f5d3SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
3386d7f5d3SJohn Marino * SUCH DAMAGE.
3486d7f5d3SJohn Marino */
3586d7f5d3SJohn Marino
3686d7f5d3SJohn Marino #include <unistd.h>
3786d7f5d3SJohn Marino #include "ww.h"
3886d7f5d3SJohn Marino #include "tt.h"
3986d7f5d3SJohn Marino
4086d7f5d3SJohn Marino /*
4186d7f5d3SJohn Marino * Tty input interrupt handler.
4286d7f5d3SJohn Marino * (1) Read input into buffer (wwib*).
4386d7f5d3SJohn Marino * (2) Set the interrupt flag if anything is read.
4486d7f5d3SJohn Marino * Currently, the last is used to get out of the blocking
4586d7f5d3SJohn Marino * select() in wwiomux().
4686d7f5d3SJohn Marino * To avoid race conditions, we only modify wwibq in here, except
4786d7f5d3SJohn Marino * when the buffer is empty; and everywhere else, we only change wwibp.
4886d7f5d3SJohn Marino * It should be completely safe.
4986d7f5d3SJohn Marino */
5086d7f5d3SJohn Marino void
wwrint(void)5186d7f5d3SJohn Marino wwrint(void)
5286d7f5d3SJohn Marino {
5386d7f5d3SJohn Marino int n;
5486d7f5d3SJohn Marino
5586d7f5d3SJohn Marino wwnread++;
5686d7f5d3SJohn Marino n = read(0, wwibq, wwibe - wwibq);
5786d7f5d3SJohn Marino if (n > 0) {
5886d7f5d3SJohn Marino if (tt.tt_rint)
5986d7f5d3SJohn Marino n = (*tt.tt_rint)(wwibq, n);
6086d7f5d3SJohn Marino if (n > 0) {
6186d7f5d3SJohn Marino wwibq += n;
6286d7f5d3SJohn Marino wwnreadc += n;
6386d7f5d3SJohn Marino /*
6486d7f5d3SJohn Marino * Hasten or delay the next checkpoint,
6586d7f5d3SJohn Marino * as the case may be.
6686d7f5d3SJohn Marino */
6786d7f5d3SJohn Marino if (tt.tt_checkpoint && !wwdocheckpoint)
6886d7f5d3SJohn Marino (void) alarm(1);
6986d7f5d3SJohn Marino wwsetintr();
7086d7f5d3SJohn Marino }
7186d7f5d3SJohn Marino } else if (n == 0)
7286d7f5d3SJohn Marino wwnreadz++;
7386d7f5d3SJohn Marino else
7486d7f5d3SJohn Marino wwnreade++;
7586d7f5d3SJohn Marino }
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