Rev 1653 | Rev 1787 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
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 $ */ |
||
3 | |||
4 | /*- |
||
5 | * Copyright (c) 1992, 1993 |
||
6 | * The Regents of the University of California. All rights reserved. |
||
7 | * |
||
8 | * This code is derived from software contributed to Berkeley by |
||
9 | * Chris Torek and Darren F. Provine. |
||
10 | * |
||
11 | * Redistribution and use in source and binary forms, with or without |
||
12 | * modification, are permitted provided that the following conditions |
||
13 | * are met: |
||
14 | * 1. Redistributions of source code must retain the above copyright |
||
15 | * notice, this list of conditions and the following disclaimer. |
||
16 | * 2. Redistributions in binary form must reproduce the above copyright |
||
17 | * notice, this list of conditions and the following disclaimer in the |
||
18 | * documentation and/or other materials provided with the distribution. |
||
19 | * 3. Neither the name of the University nor the names of its contributors |
||
20 | * may be used to endorse or promote products derived from this software |
||
21 | * without specific prior written permission. |
||
22 | * |
||
23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
||
24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
||
25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
||
26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
||
27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
||
28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
||
29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
||
30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
||
31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
||
32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
||
33 | * SUCH DAMAGE. |
||
34 | * |
||
35 | * @(#)input.c 8.1 (Berkeley) 5/31/93 |
||
36 | */ |
||
37 | |||
1653 | cejka | 38 | /** @addtogroup tetris |
39 | * @{ |
||
40 | */ |
||
41 | /** @file |
||
42 | */ |
||
43 | |||
1419 | jermar | 44 | /* |
45 | * Tetris input. |
||
46 | */ |
||
47 | |||
48 | #include <sys/types.h> |
||
49 | #include <sys/time.h> |
||
1532 | palkovsky | 50 | #include <stdio.h> |
1419 | jermar | 51 | |
52 | #include <errno.h> |
||
53 | #include <unistd.h> |
||
54 | #include <string.h> |
||
55 | |||
56 | #include "input.h" |
||
57 | #include "tetris.h" |
||
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) \ |
||
64 | ((tv)->tv_sec > 0 || ((tv)->tv_sec == 0 && (tv)->tv_usec > 0)) |
||
65 | |||
66 | /* subtract timeval `sub' from `res' */ |
||
67 | #define TV_SUB(res, sub) \ |
||
68 | (res)->tv_sec -= (sub)->tv_sec; \ |
||
69 | (res)->tv_usec -= (sub)->tv_usec; \ |
||
70 | if ((res)->tv_usec < 0) { \ |
||
71 | (res)->tv_usec += 1000000; \ |
||
72 | (res)->tv_sec--; \ |
||
73 | } |
||
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 |
||
77 | * semantics. |
||
78 | */ |
||
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. |
||
84 | * On return, modify *tvp to reflect the amount of time spent waiting. |
||
85 | * It will be positive only if input appeared before the time ran out; |
||
86 | * otherwise it will be zero or perhaps negative. |
||
87 | * |
||
88 | * If tvp is nil, wait forever, but return if select is interrupted. |
||
89 | * |
||
90 | * Return 0 => no input, 1 => can read() from stdin |
||
1469 | palkovsky | 91 | * |
1419 | jermar | 92 | */ |
93 | int |
||
94 | rwait(struct timeval *tvp) |
||
95 | { |
||
96 | struct timeval starttv, endtv, *s; |
||
1469 | palkovsky | 97 | static ipc_call_t charcall; |
1533 | palkovsky | 98 | ipcarg_t rc; |
1419 | jermar | 99 | |
100 | /* |
||
101 | * Someday, select() will do this for us. |
||
102 | * Just in case that day is now, and no one has |
||
103 | * changed this, we use a temporary. |
||
104 | */ |
||
105 | if (tvp) { |
||
1532 | palkovsky | 106 | (void) gettimeofday(&starttv, NULL); |
1419 | jermar | 107 | endtv = *tvp; |
108 | s = &endtv; |
||
109 | } else |
||
110 | s = NULL; |
||
1721 | palkovsky | 111 | |
1469 | palkovsky | 112 | if (!lastchar) { |
113 | if (!getchar_inprog) |
||
114 | getchar_inprog = async_send_2(1,CONSOLE_GETCHAR,0,0,&charcall); |
||
1532 | palkovsky | 115 | if (!s) |
116 | async_wait_for(getchar_inprog, &rc); |
||
117 | else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) { |
||
1469 | palkovsky | 118 | tvp->tv_sec = 0; |
119 | tvp->tv_usec = 0; |
||
120 | return (0); |
||
121 | } |
||
122 | getchar_inprog = 0; |
||
123 | if (rc) { |
||
124 | stop("end of file, help"); |
||
125 | } |
||
126 | lastchar = IPC_GET_ARG1(charcall); |
||
1419 | jermar | 127 | } |
128 | if (tvp) { |
||
129 | /* since there is input, we may not have timed out */ |
||
1532 | palkovsky | 130 | (void) gettimeofday(&endtv, NULL); |
1419 | jermar | 131 | TV_SUB(&endtv, &starttv); |
132 | TV_SUB(tvp, &endtv); /* adjust *tvp by elapsed time */ |
||
133 | } |
||
134 | return (1); |
||
135 | } |
||
136 | |||
137 | /* |
||
138 | * `sleep' for the current turn time (using select). |
||
139 | * Eat any input that might be available. |
||
140 | */ |
||
141 | void |
||
142 | tsleep(void) |
||
143 | { |
||
144 | struct timeval tv; |
||
145 | |||
146 | tv.tv_sec = 0; |
||
147 | tv.tv_usec = fallrate; |
||
148 | while (TV_POS(&tv)) |
||
1469 | palkovsky | 149 | if (rwait(&tv)) { |
150 | lastchar = '\0'; |
||
151 | } else |
||
1419 | jermar | 152 | break; |
153 | } |
||
154 | |||
155 | /* |
||
156 | * getchar with timeout. |
||
157 | */ |
||
158 | int |
||
159 | tgetchar(void) |
||
160 | { |
||
161 | static struct timeval timeleft; |
||
162 | char c; |
||
163 | |||
164 | /* |
||
165 | * Reset timeleft to fallrate whenever it is not positive. |
||
166 | * In any case, wait to see if there is any input. If so, |
||
167 | * take it, and update timeleft so that the next call to |
||
168 | * tgetchar() will not wait as long. If there is no input, |
||
169 | * make timeleft zero or negative, and return -1. |
||
170 | * |
||
171 | * Most of the hard work is done by rwait(). |
||
172 | */ |
||
173 | if (!TV_POS(&timeleft)) { |
||
174 | faster(); /* go faster */ |
||
175 | timeleft.tv_sec = 0; |
||
176 | timeleft.tv_usec = fallrate; |
||
177 | } |
||
178 | if (!rwait(&timeleft)) |
||
179 | return (-1); |
||
1469 | palkovsky | 180 | c = lastchar; |
181 | lastchar = '\0'; |
||
1419 | jermar | 182 | return ((int)(unsigned char)c); |
183 | } |
||
1653 | cejka | 184 | |
185 | /** @} |
||
186 | */ |
||
187 |