0,0 → 1,187 |
/* $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; |
|
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; |
|
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); |
} |
|
/** @} |
*/ |
|