Subversion Repositories HelenOS

Rev

Rev 2927 | Rev 4343 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1419 jermar 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 $    */
3
 
4
/*-
5
 * Copyright (c) 1992, 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
 * Chris Torek and Darren F. Provine.
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.
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
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
 *  @(#)input.c 8.1 (Berkeley) 5/31/93
36
 */
37
 
1653 cejka 38
/** @addtogroup tetris
39
 * @{
40
 */
41
/** @file
42
 */
43
 
1419 jermar 44
/*
45
 * Tetris input.
46
 */
47
 
48
#include <sys/types.h>
49
#include <sys/time.h>
1532 palkovsky 50
#include <stdio.h>
1419 jermar 51
 
52
#include <errno.h>
53
#include <unistd.h>
54
#include <string.h>
55
 
56
#include "input.h"
57
#include "tetris.h"
58
 
1466 palkovsky 59
#include <async.h>
2479 jermar 60
#include "../../srv/console/console.h"
1466 palkovsky 61
 
1419 jermar 62
/* return true iff the given timeval is positive */
63
#define TV_POS(tv) \
64
    ((tv)->tv_sec > 0 || ((tv)->tv_sec == 0 && (tv)->tv_usec > 0))
65
 
66
/* subtract timeval `sub' from `res' */
67
#define TV_SUB(res, sub) \
68
    (res)->tv_sec -= (sub)->tv_sec; \
69
    (res)->tv_usec -= (sub)->tv_usec; \
70
    if ((res)->tv_usec < 0) { \
71
        (res)->tv_usec += 1000000; \
72
        (res)->tv_sec--; \
73
    }
74
 
1469 palkovsky 75
/* We will use a hack here - if lastchar is non-zero, it is
76
 * the last character read. We will somehow simulate the select
77
 * semantics.
78
 */
1466 palkovsky 79
static aid_t getchar_inprog = 0;
1469 palkovsky 80
static char lastchar = '\0';
1466 palkovsky 81
 
1419 jermar 82
/*
83
 * Do a `read wait': select for reading from stdin, with timeout *tvp.
84
 * On return, modify *tvp to reflect the amount of time spent waiting.
85
 * It will be positive only if input appeared before the time ran out;
86
 * otherwise it will be zero or perhaps negative.
87
 *
88
 * If tvp is nil, wait forever, but return if select is interrupted.
89
 *
90
 * Return 0 => no input, 1 => can read() from stdin
1469 palkovsky 91
 *
1419 jermar 92
 */
93
int
94
rwait(struct timeval *tvp)
95
{
96
    struct timeval starttv, endtv, *s;
1469 palkovsky 97
    static ipc_call_t charcall;
1533 palkovsky 98
    ipcarg_t rc;
3403 svoboda 99
    int cons_phone;
1419 jermar 100
 
101
    /*
102
     * Someday, select() will do this for us.
103
     * Just in case that day is now, and no one has
104
     * changed this, we use a temporary.
105
     */
106
    if (tvp) {
1532 palkovsky 107
        (void) gettimeofday(&starttv, NULL);
1419 jermar 108
        endtv = *tvp;
109
        s = &endtv;
110
    } else
111
        s = NULL;
1721 palkovsky 112
 
1469 palkovsky 113
    if (!lastchar) {
3403 svoboda 114
        if (!getchar_inprog) {
115
            cons_phone = get_cons_phone();
116
            getchar_inprog = async_send_2(cons_phone,
117
                CONSOLE_GETCHAR, 0, 0, &charcall);
118
        }
1532 palkovsky 119
        if (!s)
120
            async_wait_for(getchar_inprog, &rc);
121
        else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) {
1469 palkovsky 122
            tvp->tv_sec = 0;
123
            tvp->tv_usec = 0;
124
            return (0);
125
        }
126
        getchar_inprog = 0;
127
        if (rc) {
128
            stop("end of file, help");
129
        }
130
        lastchar = IPC_GET_ARG1(charcall);
1419 jermar 131
    }
132
    if (tvp) {
133
        /* since there is input, we may not have timed out */
1532 palkovsky 134
        (void) gettimeofday(&endtv, NULL);
1419 jermar 135
        TV_SUB(&endtv, &starttv);
136
        TV_SUB(tvp, &endtv);    /* adjust *tvp by elapsed time */
137
    }
138
    return (1);
139
}
140
 
141
/*
142
 * `sleep' for the current turn time (using select).
143
 * Eat any input that might be available.
144
 */
145
void
146
tsleep(void)
147
{
148
    struct timeval tv;
149
 
150
    tv.tv_sec = 0;
151
    tv.tv_usec = fallrate;
152
    while (TV_POS(&tv))
1469 palkovsky 153
        if (rwait(&tv)) {
154
            lastchar = '\0';
155
        } else
1419 jermar 156
            break;
157
}
158
 
159
/*
160
 * getchar with timeout.
161
 */
162
int
163
tgetchar(void)
164
{
165
    static struct timeval timeleft;
166
    char c;
167
 
168
    /*
169
     * Reset timeleft to fallrate whenever it is not positive.
170
     * In any case, wait to see if there is any input.  If so,
171
     * take it, and update timeleft so that the next call to
172
     * tgetchar() will not wait as long.  If there is no input,
173
     * make timeleft zero or negative, and return -1.
174
     *
175
     * Most of the hard work is done by rwait().
176
     */
177
    if (!TV_POS(&timeleft)) {
178
        faster();   /* go faster */
179
        timeleft.tv_sec = 0;
180
        timeleft.tv_usec = fallrate;
181
    }
182
    if (!rwait(&timeleft))
183
        return (-1);
1469 palkovsky 184
    c = lastchar;
185
    lastchar = '\0';
1419 jermar 186
    return ((int)(unsigned char)c);
187
}
1653 cejka 188
 
189
/** @}
190
 */
191