| 0,0 → 1,166 |
|---|
| /* $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 |
| */ |
| |
| /* |
| * Tetris input. |
| */ |
| |
| #include <sys/types.h> |
| #include <sys/time.h> |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <string.h> |
| |
| #include "input.h" |
| #include "tetris.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--; \ |
| } |
| |
| /* |
| * 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; |
| fd_set fds; |
| |
| #define NILTZ ((struct timezone *)0) |
| |
| /* |
| * 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, NILTZ); |
| endtv = *tvp; |
| s = &endtv; |
| } else |
| s = NULL; |
| again: |
| FD_ZERO(&fds); |
| FD_SET(STDIN_FILENO, &fds); |
| switch (select(STDIN_FILENO + 1, &fds, (fd_set *)0, (fd_set *)0, s)) { |
| |
| case -1: |
| if (tvp == 0) |
| return (-1); |
| if (errno == EINTR) |
| goto again; |
| stop("select failed, help"); |
| /* NOTREACHED */ |
| |
| case 0: /* timed out */ |
| tvp->tv_sec = 0; |
| tvp->tv_usec = 0; |
| return (0); |
| } |
| if (tvp) { |
| /* since there is input, we may not have timed out */ |
| (void) gettimeofday(&endtv, NILTZ); |
| 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) && read(STDIN_FILENO, &c, 1) != 1) |
| 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); |
| if (read(STDIN_FILENO, &c, 1) != 1) |
| stop("end of file, help"); |
| return ((int)(unsigned char)c); |
| } |