WebSVN – HelenOS-historic – Diff – /uspace/trunk/tetris/input.c


/*  $OpenBSD: input.c,v 1.12 2005/04/13 02:33:08 deraadt Exp $  */
/*    $NetBSD: input.c,v 1.3 1996/02/06 22:47:33 jtc Exp $    */
 
/*-
 * Copyright (c) 1992, 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek and Darren F. Provine.
 *
 * 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.
 *
 *  @(#)input.c 8.1 (Berkeley) 5/31/93
 */
 
/*
 * Tetris input.
 */
 
#include <sys/types.h>
#include <sys/time.h>
#include <stdio.h>
 
#include <errno.h>
#include <unistd.h>
#include <string.h>
 
#include "input.h"
#include "tetris.h"
 
#include <async.h>
#include "../console/console.h"
 
/* return true iff the given timeval is positive */
#define TV_POS(tv) \
    ((tv)->tv_sec > 0 || ((tv)->tv_sec == 0 && (tv)->tv_usec > 0))
 
/* subtract timeval `sub' from `res' */
#define TV_SUB(res, sub) \
    (res)->tv_sec -= (sub)->tv_sec; \
    (res)->tv_usec -= (sub)->tv_usec; \
    if ((res)->tv_usec < 0) { \
        (res)->tv_usec += 1000000; \
        (res)->tv_sec--; \
    }
 
/* We will use a hack here - if lastchar is non-zero, it is
 * the last character read. We will somehow simulate the select
 * semantics.
 */
static aid_t getchar_inprog = 0;
static char lastchar = '\0';
 
/*
 * Do a `read wait': select for reading from stdin, with timeout *tvp.
 * On return, modify *tvp to reflect the amount of time spent waiting.
 * It will be positive only if input appeared before the time ran out;
 * otherwise it will be zero or perhaps negative.
 *
 * If tvp is nil, wait forever, but return if select is interrupted.
 *
 * Return 0 => no input, 1 => can read() from stdin
 *
 */
int
rwait(struct timeval *tvp)
{
    struct timeval starttv, endtv, *s;
    static ipc_call_t charcall;
    int rc;
 
 
 
    /*
     * Someday, select() will do this for us.
     * Just in case that day is now, and no one has
     * changed this, we use a temporary.
     */
    if (tvp) {
        (void) gettimeofday(&starttv, NULL);
        endtv = *tvp;
        s = &endtv;
    } else
        s = NULL;
again:
    if (!lastchar) {
        if (!getchar_inprog)
            getchar_inprog = async_send_2(1,CONSOLE_GETCHAR,0,0,&charcall);
        if (!s)
            async_wait_for(getchar_inprog, &rc);
        else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) {
            tvp->tv_sec = 0;
            tvp->tv_usec = 0;
            return (0);
        }
        getchar_inprog = 0;
        if (rc) {
            stop("end of file, help");
        }
        lastchar = IPC_GET_ARG1(charcall);
    }
    if (tvp) {
        /* since there is input, we may not have timed out */
        (void) gettimeofday(&endtv, NULL);
        TV_SUB(&endtv, &starttv);
        TV_SUB(tvp, &endtv);    /* adjust *tvp by elapsed time */
    }
    return (1);
}
 
/*
 * `sleep' for the current turn time (using select).
 * Eat any input that might be available.
 */
void
tsleep(void)
{
    struct timeval tv;
    char c;
 
    tv.tv_sec = 0;
    tv.tv_usec = fallrate;
    while (TV_POS(&tv))
        if (rwait(&tv)) {
            lastchar = '\0';
        } else
            break;
}
 
/*
 * getchar with timeout.
 */
int
tgetchar(void)
{
    static struct timeval timeleft;
    char c;
 
    /*
     * Reset timeleft to fallrate whenever it is not positive.
     * In any case, wait to see if there is any input.  If so,
     * take it, and update timeleft so that the next call to
     * tgetchar() will not wait as long.  If there is no input,
     * make timeleft zero or negative, and return -1.
     *
     * Most of the hard work is done by rwait().
     */
    if (!TV_POS(&timeleft)) {
        faster();   /* go faster */
        timeleft.tv_sec = 0;
        timeleft.tv_usec = fallrate;
    }
    if (!rwait(&timeleft))
        return (-1);
    c = lastchar;
    lastchar = '\0';
    return ((int)(unsigned char)c);
}
 

Rev 1469	Rev 1532
1	/* $OpenBSD: input.c,v 1.12 2005/04/13 02:33:08 deraadt Exp $ */	1	/* $OpenBSD: input.c,v 1.12 2005/04/13 02:33:08 deraadt Exp $ */
2	/* $NetBSD: input.c,v 1.3 1996/02/06 22:47:33 jtc Exp $ */	2	/* $NetBSD: input.c,v 1.3 1996/02/06 22:47:33 jtc Exp $ */
3		3
4	/*-	4	/*-
5	* Copyright (c) 1992, 1993	5	* Copyright (c) 1992, 1993
6	* The Regents of the University of California. All rights reserved.	6	* The Regents of the University of California. All rights reserved.
7	*	7	*
8	* This code is derived from software contributed to Berkeley by	8	* This code is derived from software contributed to Berkeley by
9	* Chris Torek and Darren F. Provine.	9	* Chris Torek and Darren F. Provine.
10	*	10	*
11	* Redistribution and use in source and binary forms, with or without	11	* Redistribution and use in source and binary forms, with or without
12	* modification, are permitted provided that the following conditions	12	* modification, are permitted provided that the following conditions
13	* are met:	13	* are met:
14	* 1. Redistributions of source code must retain the above copyright	14	* 1. Redistributions of source code must retain the above copyright
15	* notice, this list of conditions and the following disclaimer.	15	* notice, this list of conditions and the following disclaimer.
16	* 2. Redistributions in binary form must reproduce the above copyright	16	* 2. Redistributions in binary form must reproduce the above copyright
17	* notice, this list of conditions and the following disclaimer in the	17	* notice, this list of conditions and the following disclaimer in the
18	* documentation and/or other materials provided with the distribution.	18	* documentation and/or other materials provided with the distribution.
19	* 3. Neither the name of the University nor the names of its contributors	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	20	* may be used to endorse or promote products derived from this software
21	* without specific prior written permission.	21	* without specific prior written permission.
22	*	22	*
23	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND	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	24	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE	26	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)	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	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	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	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33	* SUCH DAMAGE.	33	* SUCH DAMAGE.
34	*	34	*
35	* @(#)input.c 8.1 (Berkeley) 5/31/93	35	* @(#)input.c 8.1 (Berkeley) 5/31/93
36	*/	36	*/
37		37
38	/*	38	/*
39	* Tetris input.	39	* Tetris input.
40	*/	40	*/
41		41
42	#include <sys/types.h>	42	#include <sys/types.h>
43	#include <sys/time.h>	43	#include <sys/time.h>
-		44	#include <stdio.h>
44		45
45	#include <errno.h>	46	#include <errno.h>
46	#include <unistd.h>	47	#include <unistd.h>
47	#include <string.h>	48	#include <string.h>
48		49
49	#include "input.h"	50	#include "input.h"
50	#include "tetris.h"	51	#include "tetris.h"
51		52
52	#include <async.h>	53	#include <async.h>
53	#include "../console/console.h"	54	#include "../console/console.h"
54		55
55	/* return true iff the given timeval is positive */	56	/* return true iff the given timeval is positive */
56	#define TV_POS(tv) \	57	#define TV_POS(tv) \
57	((tv)->tv_sec > 0 \|\| ((tv)->tv_sec == 0 && (tv)->tv_usec > 0))	58	((tv)->tv_sec > 0 \|\| ((tv)->tv_sec == 0 && (tv)->tv_usec > 0))
58		59
59	/* subtract timeval `sub' from `res' */	60	/* subtract timeval `sub' from `res' */
60	#define TV_SUB(res, sub) \	61	#define TV_SUB(res, sub) \
61	(res)->tv_sec -= (sub)->tv_sec; \	62	(res)->tv_sec -= (sub)->tv_sec; \
62	(res)->tv_usec -= (sub)->tv_usec; \	63	(res)->tv_usec -= (sub)->tv_usec; \
63	if ((res)->tv_usec < 0) { \	64	if ((res)->tv_usec < 0) { \
64	(res)->tv_usec += 1000000; \	65	(res)->tv_usec += 1000000; \
65	(res)->tv_sec--; \	66	(res)->tv_sec--; \
66	}	67	}
67		68
68	/* We will use a hack here - if lastchar is non-zero, it is	69	/* We will use a hack here - if lastchar is non-zero, it is
69	* the last character read. We will somehow simulate the select	70	* the last character read. We will somehow simulate the select
70	* semantics.	71	* semantics.
71	*/	72	*/
72	static aid_t getchar_inprog = 0;	73	static aid_t getchar_inprog = 0;
73	static char lastchar = '\0';	74	static char lastchar = '\0';
74		75
75	/*	76	/*
76	* Do a `read wait': select for reading from stdin, with timeout *tvp.	77	* Do a `read wait': select for reading from stdin, with timeout *tvp.
77	* On return, modify *tvp to reflect the amount of time spent waiting.	78	* On return, modify *tvp to reflect the amount of time spent waiting.
78	* It will be positive only if input appeared before the time ran out;	79	* It will be positive only if input appeared before the time ran out;
79	* otherwise it will be zero or perhaps negative.	80	* otherwise it will be zero or perhaps negative.
80	*	81	*
81	* If tvp is nil, wait forever, but return if select is interrupted.	82	* If tvp is nil, wait forever, but return if select is interrupted.
82	*	83	*
83	* Return 0 => no input, 1 => can read() from stdin	84	* Return 0 => no input, 1 => can read() from stdin
84	*	85	*
85	*/	86	*/
86	int	87	int
87	rwait(struct timeval *tvp)	88	rwait(struct timeval *tvp)
88	{	89	{
89	struct timeval starttv, endtv, *s;	90	struct timeval starttv, endtv, *s;
90	static ipc_call_t charcall;	91	static ipc_call_t charcall;
91	int rc;	92	int rc;
92		93
93	#define NILTZ ((struct timezone *)0)	-
94		-
95	/*	94	/*
96	* Someday, select() will do this for us.	95	* Someday, select() will do this for us.
97	* Just in case that day is now, and no one has	96	* Just in case that day is now, and no one has
98	* changed this, we use a temporary.	97	* changed this, we use a temporary.
99	*/	98	*/
100	if (tvp) {	99	if (tvp) {
101	(void) gettimeofday(&starttv, NILTZ);	100	(void) gettimeofday(&starttv, NULL);
102	endtv = *tvp;	101	endtv = *tvp;
103	s = &endtv;	102	s = &endtv;
104	} else	103	} else
105	s = NULL;	104	s = NULL;
106	again:	105	again:
107	if (!lastchar) {	106	if (!lastchar) {
108	if (!getchar_inprog)	107	if (!getchar_inprog)
109	getchar_inprog = async_send_2(1,CONSOLE_GETCHAR,0,0,&charcall);	108	getchar_inprog = async_send_2(1,CONSOLE_GETCHAR,0,0,&charcall);
-		109	if (!s)
-		110	async_wait_for(getchar_inprog, &rc);
110	if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) {	111	else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) {
111	tvp->tv_sec = 0;	112	tvp->tv_sec = 0;
112	tvp->tv_usec = 0;	113	tvp->tv_usec = 0;
113	return (0);	114	return (0);
114	}	115	}
115	getchar_inprog = 0;	116	getchar_inprog = 0;
116	if (rc) {	117	if (rc) {
117	stop("end of file, help");	118	stop("end of file, help");
118	}	119	}
119	lastchar = IPC_GET_ARG1(charcall);	120	lastchar = IPC_GET_ARG1(charcall);
120	}	121	}
121	if (tvp) {	122	if (tvp) {
122	/* since there is input, we may not have timed out */	123	/* since there is input, we may not have timed out */
123	(void) gettimeofday(&endtv, NILTZ);	124	(void) gettimeofday(&endtv, NULL);
124	TV_SUB(&endtv, &starttv);	125	TV_SUB(&endtv, &starttv);
125	TV_SUB(tvp, &endtv); /* adjust tvp by elapsed time /	126	TV_SUB(tvp, &endtv); /* adjust tvp by elapsed time /
126	}	127	}
127	return (1);	128	return (1);
128	}	129	}
129		130
130	/*	131	/*
131	* `sleep' for the current turn time (using select).	132	* `sleep' for the current turn time (using select).
132	* Eat any input that might be available.	133	* Eat any input that might be available.
133	*/	134	*/
134	void	135	void
135	tsleep(void)	136	tsleep(void)
136	{	137	{
137	struct timeval tv;	138	struct timeval tv;
138	char c;	139	char c;
139		140
140	tv.tv_sec = 0;	141	tv.tv_sec = 0;
141	tv.tv_usec = fallrate;	142	tv.tv_usec = fallrate;
142	while (TV_POS(&tv))	143	while (TV_POS(&tv))
143	if (rwait(&tv)) {	144	if (rwait(&tv)) {
144	lastchar = '\0';	145	lastchar = '\0';
145	} else	146	} else
146	break;	147	break;
147	}	148	}
148		149
149	/*	150	/*
150	* getchar with timeout.	151	* getchar with timeout.
151	*/	152	*/
152	int	153	int
153	tgetchar(void)	154	tgetchar(void)
154	{	155	{
155	static struct timeval timeleft;	156	static struct timeval timeleft;
156	char c;	157	char c;
157		158
158	/*	159	/*
159	* Reset timeleft to fallrate whenever it is not positive.	160	* Reset timeleft to fallrate whenever it is not positive.
160	* In any case, wait to see if there is any input. If so,	161	* In any case, wait to see if there is any input. If so,
161	* take it, and update timeleft so that the next call to	162	* take it, and update timeleft so that the next call to
162	* tgetchar() will not wait as long. If there is no input,	163	* tgetchar() will not wait as long. If there is no input,
163	* make timeleft zero or negative, and return -1.	164	* make timeleft zero or negative, and return -1.
164	*	165	*
165	* Most of the hard work is done by rwait().	166	* Most of the hard work is done by rwait().
166	*/	167	*/
167	if (!TV_POS(&timeleft)) {	168	if (!TV_POS(&timeleft)) {
168	faster(); /* go faster */	169	faster(); /* go faster */
169	timeleft.tv_sec = 0;	170	timeleft.tv_sec = 0;
170	timeleft.tv_usec = fallrate;	171	timeleft.tv_usec = fallrate;
171	}	172	}
172	if (!rwait(&timeleft))	173	if (!rwait(&timeleft))
173	return (-1);	174	return (-1);
174	c = lastchar;	175	c = lastchar;
175	lastchar = '\0';	176	lastchar = '\0';
176	return ((int)(unsigned char)c);	177	return ((int)(unsigned char)c);
177	}	178	}
178		179

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(root)/uspace/trunk/tetris/input.c – Rev 1469 → 1532