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
 */
 
/** @addtogroup tetris
 * @{
 */
/** @file
 */
 
/*
 * 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;
    ipcarg_t 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 1533	Rev 1653
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	/** @addtogroup tetris
-		39	* @{
-		40	*/
-		41	/** @file
-		42	*/
-		43
38	/*	44	/*
39	* Tetris input.	45	* Tetris input.
40	*/	46	*/
41		47
42	#include <sys/types.h>	48	#include <sys/types.h>
43	#include <sys/time.h>	49	#include <sys/time.h>
44	#include <stdio.h>	50	#include <stdio.h>
45		51
46	#include <errno.h>	52	#include <errno.h>
47	#include <unistd.h>	53	#include <unistd.h>
48	#include <string.h>	54	#include <string.h>
49		55
50	#include "input.h"	56	#include "input.h"
51	#include "tetris.h"	57	#include "tetris.h"
52		58
53	#include <async.h>	59	#include <async.h>
54	#include "../console/console.h"	60	#include "../console/console.h"
55		61
56	/* return true iff the given timeval is positive */	62	/* return true iff the given timeval is positive */
57	#define TV_POS(tv) \	63	#define TV_POS(tv) \
58	((tv)->tv_sec > 0 \|\| ((tv)->tv_sec == 0 && (tv)->tv_usec > 0))	64	((tv)->tv_sec > 0 \|\| ((tv)->tv_sec == 0 && (tv)->tv_usec > 0))
59		65
60	/* subtract timeval `sub' from `res' */	66	/* subtract timeval `sub' from `res' */
61	#define TV_SUB(res, sub) \	67	#define TV_SUB(res, sub) \
62	(res)->tv_sec -= (sub)->tv_sec; \	68	(res)->tv_sec -= (sub)->tv_sec; \
63	(res)->tv_usec -= (sub)->tv_usec; \	69	(res)->tv_usec -= (sub)->tv_usec; \
64	if ((res)->tv_usec < 0) { \	70	if ((res)->tv_usec < 0) { \
65	(res)->tv_usec += 1000000; \	71	(res)->tv_usec += 1000000; \
66	(res)->tv_sec--; \	72	(res)->tv_sec--; \
67	}	73	}
68		74
69	/* We will use a hack here - if lastchar is non-zero, it is	75	/* We will use a hack here - if lastchar is non-zero, it is
70	* the last character read. We will somehow simulate the select	76	* the last character read. We will somehow simulate the select
71	* semantics.	77	* semantics.
72	*/	78	*/
73	static aid_t getchar_inprog = 0;	79	static aid_t getchar_inprog = 0;
74	static char lastchar = '\0';	80	static char lastchar = '\0';
75		81
76	/*	82	/*
77	* Do a `read wait': select for reading from stdin, with timeout *tvp.	83	* Do a `read wait': select for reading from stdin, with timeout *tvp.
78	* On return, modify *tvp to reflect the amount of time spent waiting.	84	* On return, modify *tvp to reflect the amount of time spent waiting.
79	* It will be positive only if input appeared before the time ran out;	85	* It will be positive only if input appeared before the time ran out;
80	* otherwise it will be zero or perhaps negative.	86	* otherwise it will be zero or perhaps negative.
81	*	87	*
82	* If tvp is nil, wait forever, but return if select is interrupted.	88	* If tvp is nil, wait forever, but return if select is interrupted.
83	*	89	*
84	* Return 0 => no input, 1 => can read() from stdin	90	* Return 0 => no input, 1 => can read() from stdin
85	*	91	*
86	*/	92	*/
87	int	93	int
88	rwait(struct timeval *tvp)	94	rwait(struct timeval *tvp)
89	{	95	{
90	struct timeval starttv, endtv, *s;	96	struct timeval starttv, endtv, *s;
91	static ipc_call_t charcall;	97	static ipc_call_t charcall;
92	ipcarg_t rc;	98	ipcarg_t rc;
93		99
94	/*	100	/*
95	* Someday, select() will do this for us.	101	* Someday, select() will do this for us.
96	* Just in case that day is now, and no one has	102	* Just in case that day is now, and no one has
97	* changed this, we use a temporary.	103	* changed this, we use a temporary.
98	*/	104	*/
99	if (tvp) {	105	if (tvp) {
100	(void) gettimeofday(&starttv, NULL);	106	(void) gettimeofday(&starttv, NULL);
101	endtv = *tvp;	107	endtv = *tvp;
102	s = &endtv;	108	s = &endtv;
103	} else	109	} else
104	s = NULL;	110	s = NULL;
105	again:	111	again:
106	if (!lastchar) {	112	if (!lastchar) {
107	if (!getchar_inprog)	113	if (!getchar_inprog)
108	getchar_inprog = async_send_2(1,CONSOLE_GETCHAR,0,0,&charcall);	114	getchar_inprog = async_send_2(1,CONSOLE_GETCHAR,0,0,&charcall);
109	if (!s)	115	if (!s)
110	async_wait_for(getchar_inprog, &rc);	116	async_wait_for(getchar_inprog, &rc);
111	else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) {	117	else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) {
112	tvp->tv_sec = 0;	118	tvp->tv_sec = 0;
113	tvp->tv_usec = 0;	119	tvp->tv_usec = 0;
114	return (0);	120	return (0);
115	}	121	}
116	getchar_inprog = 0;	122	getchar_inprog = 0;
117	if (rc) {	123	if (rc) {
118	stop("end of file, help");	124	stop("end of file, help");
119	}	125	}
120	lastchar = IPC_GET_ARG1(charcall);	126	lastchar = IPC_GET_ARG1(charcall);
121	}	127	}
122	if (tvp) {	128	if (tvp) {
123	/* since there is input, we may not have timed out */	129	/* since there is input, we may not have timed out */
124	(void) gettimeofday(&endtv, NULL);	130	(void) gettimeofday(&endtv, NULL);
125	TV_SUB(&endtv, &starttv);	131	TV_SUB(&endtv, &starttv);
126	TV_SUB(tvp, &endtv); /* adjust tvp by elapsed time /	132	TV_SUB(tvp, &endtv); /* adjust tvp by elapsed time /
127	}	133	}
128	return (1);	134	return (1);
129	}	135	}
130		136
131	/*	137	/*
132	* `sleep' for the current turn time (using select).	138	* `sleep' for the current turn time (using select).
133	* Eat any input that might be available.	139	* Eat any input that might be available.
134	*/	140	*/
135	void	141	void
136	tsleep(void)	142	tsleep(void)
137	{	143	{
138	struct timeval tv;	144	struct timeval tv;
139	char c;	145	char c;
140		146
141	tv.tv_sec = 0;	147	tv.tv_sec = 0;
142	tv.tv_usec = fallrate;	148	tv.tv_usec = fallrate;
143	while (TV_POS(&tv))	149	while (TV_POS(&tv))
144	if (rwait(&tv)) {	150	if (rwait(&tv)) {
145	lastchar = '\0';	151	lastchar = '\0';
146	} else	152	} else
147	break;	153	break;
148	}	154	}
149		155
150	/*	156	/*
151	* getchar with timeout.	157	* getchar with timeout.
152	*/	158	*/
153	int	159	int
154	tgetchar(void)	160	tgetchar(void)
155	{	161	{
156	static struct timeval timeleft;	162	static struct timeval timeleft;
157	char c;	163	char c;
158		164
159	/*	165	/*
160	* Reset timeleft to fallrate whenever it is not positive.	166	* Reset timeleft to fallrate whenever it is not positive.
161	* In any case, wait to see if there is any input. If so,	167	* In any case, wait to see if there is any input. If so,
162	* take it, and update timeleft so that the next call to	168	* take it, and update timeleft so that the next call to
163	* tgetchar() will not wait as long. If there is no input,	169	* tgetchar() will not wait as long. If there is no input,
164	* make timeleft zero or negative, and return -1.	170	* make timeleft zero or negative, and return -1.
165	*	171	*
166	* Most of the hard work is done by rwait().	172	* Most of the hard work is done by rwait().
167	*/	173	*/
168	if (!TV_POS(&timeleft)) {	174	if (!TV_POS(&timeleft)) {
169	faster(); /* go faster */	175	faster(); /* go faster */
170	timeleft.tv_sec = 0;	176	timeleft.tv_sec = 0;
171	timeleft.tv_usec = fallrate;	177	timeleft.tv_usec = fallrate;
172	}	178	}
173	if (!rwait(&timeleft))	179	if (!rwait(&timeleft))
174	return (-1);	180	return (-1);
175	c = lastchar;	181	c = lastchar;
176	lastchar = '\0';	182	lastchar = '\0';
177	return ((int)(unsigned char)c);	183	return ((int)(unsigned char)c);
178	}	184	}
-		185
-		186	/** @}
-		187	*/
-		188
179		189

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