[dragonfly.git] / usr.bin / window / wwrint.c

/*	@(#)wwrint.c	8.1 (Berkeley) 6/6/93	*/
/*	$NetBSD: wwrint.c,v 1.7 2003/08/07 11:17:44 agc Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Wang at The University of California, Berkeley.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <unistd.h>
#include "ww.h"
#include "tt.h"

/*
 * Tty input interrupt handler.
 * (1) Read input into buffer (wwib*).
 * (2) Set the interrupt flag if anything is read.
 * Currently, the last is used to get out of the blocking
 * select() in wwiomux().
 * To avoid race conditions, we only modify wwibq in here, except
 * when the buffer is empty; and everywhere else, we only change wwibp.
 * It should be completely safe.
 */
void
wwrint(void)
{
	int n;

	wwnread++;
	n = read(0, wwibq, wwibe - wwibq);
	if (n > 0) {
		if (tt.tt_rint)
			n = (*tt.tt_rint)(wwibq, n);
		if (n > 0) {
			wwibq += n;
			wwnreadc += n;
			/*
			 * Hasten or delay the next checkpoint,
			 * as the case may be.
			 */
			if (tt.tt_checkpoint && !wwdocheckpoint)
				(void) alarm(1);
			wwsetintr();
		}
	} else if (n == 0)
		wwnreadz++;
	else
		wwnreade++;
}
Commit	Line	Data
2c872e05	1	/* @(#)wwrint.c 8.1 (Berkeley) 6/6/93 */
abecab39 SW	2	/* $NetBSD: wwrint.c,v 1.7 2003/08/07 11:17:44 agc Exp $ */
abecab39 SW	3
984263bc MD	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.
abecab39	19	* 3. Neither the name of the University nor the names of its contributors
984263bc MD	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
abecab39	36	#include <unistd.h>
984263bc MD	37	#include "ww.h"
984263bc MD	38	#include "tt.h"
984263bc MD	39
	40	/*
	41	* Tty input interrupt handler.
	42	* (1) Read input into buffer (wwib*).
	43	* (2) Set the interrupt flag if anything is read.
	44	* Currently, the last is used to get out of the blocking
	45	* select() in wwiomux().
	46	* To avoid race conditions, we only modify wwibq in here, except
	47	* when the buffer is empty; and everywhere else, we only change wwibp.
	48	* It should be completely safe.
	49	*/
	50	void
abecab39	51	wwrint(void)
984263bc	52	{
abecab39	53	int n;
984263bc	54
984263bc	55	wwnread++;
984263bc	56	n = read(0, wwibq, wwibe - wwibq);
984263bc MD	57	if (n > 0) {
	58	if (tt.tt_rint)
	59	n = (*tt.tt_rint)(wwibq, n);
	60	if (n > 0) {
	61	wwibq += n;
	62	wwnreadc += n;
	63	/*
	64	* Hasten or delay the next checkpoint,
	65	* as the case may be.
	66	*/
	67	if (tt.tt_checkpoint && !wwdocheckpoint)
	68	(void) alarm(1);
	69	wwsetintr();
	70	}
	71	} else if (n == 0)
	72	wwnreadz++;
	73	else
	74	wwnreade++;
	75	}