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| Rev | Author | Line No. | Line |
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| 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 $ */ |
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| 3 | |||
| 4 | /*- |
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| 5 | * Copyright (c) 1992, 1993 |
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| 6 | * The Regents of the University of California. All rights reserved. |
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| 7 | * |
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| 8 | * This code is derived from software contributed to Berkeley by |
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| 9 | * Chris Torek and Darren F. Provine. |
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| 10 | * |
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| 11 | * Redistribution and use in source and binary forms, with or without |
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| 12 | * modification, are permitted provided that the following conditions |
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| 13 | * are met: |
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| 14 | * 1. Redistributions of source code must retain the above copyright |
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| 15 | * notice, this list of conditions and the following disclaimer. |
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 17 | * notice, this list of conditions and the following disclaimer in the |
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| 18 | * documentation and/or other materials provided with the distribution. |
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| 19 | * 3. Neither the name of the University nor the names of its contributors |
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| 20 | * may be used to endorse or promote products derived from this software |
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| 21 | * without specific prior written permission. |
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| 22 | * |
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 33 | * SUCH DAMAGE. |
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| 34 | * |
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| 35 | * @(#)input.c 8.1 (Berkeley) 5/31/93 |
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| 36 | */ |
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| 37 | |||
| 1653 | cejka | 38 | /** @addtogroup tetris |
| 39 | * @{ |
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| 40 | */ |
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| 41 | /** @file |
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| 42 | */ |
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| 43 | |||
| 1419 | jermar | 44 | /* |
| 45 | * Tetris input. |
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| 46 | */ |
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| 47 | |||
| 48 | #include <sys/types.h> |
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| 49 | #include <sys/time.h> |
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| 1532 | palkovsky | 50 | #include <stdio.h> |
| 1419 | jermar | 51 | |
| 52 | #include <errno.h> |
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| 53 | #include <unistd.h> |
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| 54 | #include <string.h> |
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| 55 | |||
| 56 | #include "input.h" |
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| 57 | #include "tetris.h" |
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| 58 | |||
| 1466 | palkovsky | 59 | #include <async.h> |
| 1469 | palkovsky | 60 | #include "../console/console.h" |
| 1466 | palkovsky | 61 | |
| 1419 | jermar | 62 | /* return true iff the given timeval is positive */ |
| 63 | #define TV_POS(tv) \ |
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| 64 | ((tv)->tv_sec > 0 || ((tv)->tv_sec == 0 && (tv)->tv_usec > 0)) |
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| 65 | |||
| 66 | /* subtract timeval `sub' from `res' */ |
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| 67 | #define TV_SUB(res, sub) \ |
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| 68 | (res)->tv_sec -= (sub)->tv_sec; \ |
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| 69 | (res)->tv_usec -= (sub)->tv_usec; \ |
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| 70 | if ((res)->tv_usec < 0) { \ |
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| 71 | (res)->tv_usec += 1000000; \ |
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| 72 | (res)->tv_sec--; \ |
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| 73 | } |
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| 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 |
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| 77 | * semantics. |
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| 78 | */ |
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| 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. |
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| 84 | * On return, modify *tvp to reflect the amount of time spent waiting. |
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| 85 | * It will be positive only if input appeared before the time ran out; |
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| 86 | * otherwise it will be zero or perhaps negative. |
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| 87 | * |
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| 88 | * If tvp is nil, wait forever, but return if select is interrupted. |
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| 89 | * |
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| 90 | * Return 0 => no input, 1 => can read() from stdin |
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| 1469 | palkovsky | 91 | * |
| 1419 | jermar | 92 | */ |
| 93 | int |
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| 94 | rwait(struct timeval *tvp) |
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| 95 | { |
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| 96 | struct timeval starttv, endtv, *s; |
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| 1469 | palkovsky | 97 | static ipc_call_t charcall; |
| 1533 | palkovsky | 98 | ipcarg_t rc; |
| 1419 | jermar | 99 | |
| 100 | /* |
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| 101 | * Someday, select() will do this for us. |
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| 102 | * Just in case that day is now, and no one has |
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| 103 | * changed this, we use a temporary. |
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| 104 | */ |
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| 105 | if (tvp) { |
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| 1532 | palkovsky | 106 | (void) gettimeofday(&starttv, NULL); |
| 1419 | jermar | 107 | endtv = *tvp; |
| 108 | s = &endtv; |
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| 109 | } else |
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| 110 | s = NULL; |
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| 1721 | palkovsky | 111 | |
| 1469 | palkovsky | 112 | if (!lastchar) { |
| 113 | if (!getchar_inprog) |
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| 114 | getchar_inprog = async_send_2(1,CONSOLE_GETCHAR,0,0,&charcall); |
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| 1532 | palkovsky | 115 | if (!s) |
| 116 | async_wait_for(getchar_inprog, &rc); |
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| 117 | else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) { |
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| 1469 | palkovsky | 118 | tvp->tv_sec = 0; |
| 119 | tvp->tv_usec = 0; |
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| 120 | return (0); |
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| 121 | } |
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| 122 | getchar_inprog = 0; |
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| 123 | if (rc) { |
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| 124 | stop("end of file, help"); |
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| 125 | } |
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| 126 | lastchar = IPC_GET_ARG1(charcall); |
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| 1419 | jermar | 127 | } |
| 128 | if (tvp) { |
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| 129 | /* since there is input, we may not have timed out */ |
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| 1532 | palkovsky | 130 | (void) gettimeofday(&endtv, NULL); |
| 1419 | jermar | 131 | TV_SUB(&endtv, &starttv); |
| 132 | TV_SUB(tvp, &endtv); /* adjust *tvp by elapsed time */ |
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| 133 | } |
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| 134 | return (1); |
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| 135 | } |
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| 136 | |||
| 137 | /* |
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| 138 | * `sleep' for the current turn time (using select). |
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| 139 | * Eat any input that might be available. |
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| 140 | */ |
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| 141 | void |
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| 142 | tsleep(void) |
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| 143 | { |
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| 144 | struct timeval tv; |
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| 145 | |||
| 146 | tv.tv_sec = 0; |
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| 147 | tv.tv_usec = fallrate; |
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| 148 | while (TV_POS(&tv)) |
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| 1469 | palkovsky | 149 | if (rwait(&tv)) { |
| 150 | lastchar = '\0'; |
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| 151 | } else |
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| 1419 | jermar | 152 | break; |
| 153 | } |
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| 154 | |||
| 155 | /* |
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| 156 | * getchar with timeout. |
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| 157 | */ |
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| 158 | int |
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| 159 | tgetchar(void) |
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| 160 | { |
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| 161 | static struct timeval timeleft; |
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| 162 | char c; |
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| 163 | |||
| 164 | /* |
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| 165 | * Reset timeleft to fallrate whenever it is not positive. |
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| 166 | * In any case, wait to see if there is any input. If so, |
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| 167 | * take it, and update timeleft so that the next call to |
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| 168 | * tgetchar() will not wait as long. If there is no input, |
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| 169 | * make timeleft zero or negative, and return -1. |
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| 170 | * |
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| 171 | * Most of the hard work is done by rwait(). |
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| 172 | */ |
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| 173 | if (!TV_POS(&timeleft)) { |
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| 174 | faster(); /* go faster */ |
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| 175 | timeleft.tv_sec = 0; |
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| 176 | timeleft.tv_usec = fallrate; |
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| 177 | } |
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| 178 | if (!rwait(&timeleft)) |
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| 179 | return (-1); |
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| 1469 | palkovsky | 180 | c = lastchar; |
| 181 | lastchar = '\0'; |
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| 1419 | jermar | 182 | return ((int)(unsigned char)c); |
| 183 | } |
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| 1653 | cejka | 184 | |
| 185 | /** @} |
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| 186 | */ |
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| 187 |