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1419 jermar 1
/*  $OpenBSD: input.c,v 1.12 2005/04/13 02:33:08 deraadt Exp $  */
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/*    $NetBSD: input.c,v 1.3 1996/02/06 22:47:33 jtc Exp $    */
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/*-
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 * Copyright (c) 1992, 1993
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 *  The Regents of the University of California.  All rights reserved.
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 *
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 * This code is derived from software contributed to Berkeley by
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 * Chris Torek and Darren F. Provine.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 *  @(#)input.c 8.1 (Berkeley) 5/31/93
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 */
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1653 cejka 38
/** @addtogroup tetris
4691 svoboda 39
 * @{
1653 cejka 40
 */
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/** @file
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 */
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1419 jermar 44
/*
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 * Tetris input.
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 */
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#include <sys/types.h>
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#include <sys/time.h>
1532 palkovsky 50
#include <stdio.h>
1419 jermar 51
 
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include "input.h"
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#include "tetris.h"
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1466 palkovsky 59
#include <async.h>
4691 svoboda 60
#include <vfs/vfs.h>
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#include <io/console.h>
4338 svoboda 62
#include <ipc/console.h>
1466 palkovsky 63
 
1419 jermar 64
/* return true iff the given timeval is positive */
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#define TV_POS(tv) \
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    ((tv)->tv_sec > 0 || ((tv)->tv_sec == 0 && (tv)->tv_usec > 0))
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/* subtract timeval `sub' from `res' */
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#define TV_SUB(res, sub) \
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    (res)->tv_sec -= (sub)->tv_sec; \
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    (res)->tv_usec -= (sub)->tv_usec; \
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    if ((res)->tv_usec < 0) { \
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        (res)->tv_usec += 1000000; \
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        (res)->tv_sec--; \
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    }
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1469 palkovsky 77
/* We will use a hack here - if lastchar is non-zero, it is
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 * the last character read. We will somehow simulate the select
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 * semantics.
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 */
1466 palkovsky 81
static aid_t getchar_inprog = 0;
1469 palkovsky 82
static char lastchar = '\0';
1466 palkovsky 83
 
1419 jermar 84
/*
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 * Do a `read wait': select for reading from stdin, with timeout *tvp.
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 * On return, modify *tvp to reflect the amount of time spent waiting.
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 * It will be positive only if input appeared before the time ran out;
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 * otherwise it will be zero or perhaps negative.
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 *
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 * If tvp is nil, wait forever, but return if select is interrupted.
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 *
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 * Return 0 => no input, 1 => can read() from stdin
1469 palkovsky 93
 *
1419 jermar 94
 */
4691 svoboda 95
int rwait(struct timeval *tvp)
1419 jermar 96
{
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    struct timeval starttv, endtv, *s;
1469 palkovsky 98
    static ipc_call_t charcall;
1533 palkovsky 99
    ipcarg_t rc;
4691 svoboda 100
 
1419 jermar 101
    /*
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     * Someday, select() will do this for us.
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     * Just in case that day is now, and no one has
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     * changed this, we use a temporary.
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     */
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    if (tvp) {
1532 palkovsky 107
        (void) gettimeofday(&starttv, NULL);
1419 jermar 108
        endtv = *tvp;
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        s = &endtv;
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    } else
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        s = NULL;
4691 svoboda 112
 
1469 palkovsky 113
    if (!lastchar) {
4345 svoboda 114
again:
3403 svoboda 115
        if (!getchar_inprog) {
4691 svoboda 116
            getchar_inprog = async_send_0(fphone(stdin),
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                CONSOLE_GET_EVENT, &charcall);
3403 svoboda 118
        }
4691 svoboda 119
 
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        if (!s)
1532 palkovsky 121
            async_wait_for(getchar_inprog, &rc);
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        else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) {
1469 palkovsky 123
            tvp->tv_sec = 0;
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            tvp->tv_usec = 0;
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            return (0);
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        }
4691 svoboda 127
 
1469 palkovsky 128
        getchar_inprog = 0;
4691 svoboda 129
        if (rc)
1469 palkovsky 130
            stop("end of file, help");
4691 svoboda 131
 
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        if (IPC_GET_ARG1(charcall) == KEY_RELEASE)
4345 svoboda 133
            goto again;
4691 svoboda 134
 
4343 svoboda 135
        lastchar = IPC_GET_ARG4(charcall);
1419 jermar 136
    }
4691 svoboda 137
 
1419 jermar 138
    if (tvp) {
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        /* since there is input, we may not have timed out */
1532 palkovsky 140
        (void) gettimeofday(&endtv, NULL);
1419 jermar 141
        TV_SUB(&endtv, &starttv);
4691 svoboda 142
        TV_SUB(tvp, &endtv);  /* adjust *tvp by elapsed time */
1419 jermar 143
    }
4691 svoboda 144
 
145
    return 1;
1419 jermar 146
}
147
 
148
/*
149
 * `sleep' for the current turn time (using select).
150
 * Eat any input that might be available.
151
 */
4691 svoboda 152
void tsleep(void)
1419 jermar 153
{
154
    struct timeval tv;
4691 svoboda 155
 
1419 jermar 156
    tv.tv_sec = 0;
157
    tv.tv_usec = fallrate;
158
    while (TV_POS(&tv))
1469 palkovsky 159
        if (rwait(&tv)) {
160
            lastchar = '\0';
161
        } else
1419 jermar 162
            break;
163
}
164
 
165
/*
166
 * getchar with timeout.
167
 */
4691 svoboda 168
int tgetchar(void)
1419 jermar 169
{
170
    static struct timeval timeleft;
171
    char c;
4691 svoboda 172
 
1419 jermar 173
    /*
174
     * Reset timeleft to fallrate whenever it is not positive.
175
     * In any case, wait to see if there is any input.  If so,
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     * take it, and update timeleft so that the next call to
177
     * tgetchar() will not wait as long.  If there is no input,
178
     * make timeleft zero or negative, and return -1.
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     *
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     * Most of the hard work is done by rwait().
181
     */
182
    if (!TV_POS(&timeleft)) {
4691 svoboda 183
        faster();  /* go faster */
1419 jermar 184
        timeleft.tv_sec = 0;
185
        timeleft.tv_usec = fallrate;
186
    }
4691 svoboda 187
 
1419 jermar 188
    if (!rwait(&timeleft))
4691 svoboda 189
        return -1;
190
 
1469 palkovsky 191
    c = lastchar;
192
    lastchar = '\0';
4691 svoboda 193
    return ((int) (unsigned char) c);
1419 jermar 194
}
1653 cejka 195
 
196
/** @}
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 */