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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
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 * @{
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 */
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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>
4488 decky 60
#include <vfs/vfs.h>
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#include <io/console.h>
3747 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
 */
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int
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rwait(struct timeval *tvp)
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{
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    struct timeval starttv, endtv, *s;
1469 palkovsky 99
    static ipc_call_t charcall;
1533 palkovsky 100
    ipcarg_t rc;
1419 jermar 101
 
102
    /*
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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 108
        (void) gettimeofday(&starttv, NULL);
1419 jermar 109
        endtv = *tvp;
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        s = &endtv;
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    } else
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        s = NULL;
1721 palkovsky 113
 
1469 palkovsky 114
    if (!lastchar) {
4033 svoboda 115
again:
3224 svoboda 116
        if (!getchar_inprog) {
4488 decky 117
            getchar_inprog = async_send_0(fphone(stdin),
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                CONSOLE_GET_EVENT, &charcall);
3224 svoboda 119
        }
4488 decky 120
        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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        }
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        getchar_inprog = 0;
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        if (rc) {
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            stop("end of file, help");
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        }
4488 decky 131
        if (IPC_GET_ARG1(charcall) == KEY_RELEASE)
4033 svoboda 132
            goto again;
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3905 svoboda 134
        lastchar = IPC_GET_ARG4(charcall);
1419 jermar 135
    }
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    if (tvp) {
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        /* since there is input, we may not have timed out */
1532 palkovsky 138
        (void) gettimeofday(&endtv, NULL);
1419 jermar 139
        TV_SUB(&endtv, &starttv);
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        TV_SUB(tvp, &endtv);    /* adjust *tvp by elapsed time */
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    }
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    return (1);
143
}
144
 
145
/*
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 * `sleep' for the current turn time (using select).
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 * Eat any input that might be available.
148
 */
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void
150
tsleep(void)
151
{
152
    struct timeval tv;
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154
    tv.tv_sec = 0;
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    tv.tv_usec = fallrate;
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    while (TV_POS(&tv))
1469 palkovsky 157
        if (rwait(&tv)) {
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            lastchar = '\0';
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        } else
1419 jermar 160
            break;
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}
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163
/*
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 * getchar with timeout.
165
 */
166
int
167
tgetchar(void)
168
{
169
    static struct timeval timeleft;
170
    char c;
171
 
172
    /*
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     * Reset timeleft to fallrate whenever it is not positive.
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     * 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
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     * tgetchar() will not wait as long.  If there is no input,
177
     * make timeleft zero or negative, and return -1.
178
     *
179
     * Most of the hard work is done by rwait().
180
     */
181
    if (!TV_POS(&timeleft)) {
182
        faster();   /* go faster */
183
        timeleft.tv_sec = 0;
184
        timeleft.tv_usec = fallrate;
185
    }
186
    if (!rwait(&timeleft))
187
        return (-1);
1469 palkovsky 188
    c = lastchar;
189
    lastchar = '\0';
1419 jermar 190
    return ((int)(unsigned char)c);
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}
1653 cejka 192
 
193
/** @}
194
 */
195