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1 | /* $OpenBSD: input.c,v 1.12 2005/04/13 02:33:08 deraadt Exp $ */ |
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 $ */ |
2 | /* $NetBSD: input.c,v 1.3 1996/02/06 22:47:33 jtc Exp $ */ |
3 | 3 | ||
4 | /*- |
4 | /*- |
5 | * Copyright (c) 1992, 1993 |
5 | * Copyright (c) 1992, 1993 |
6 | * The Regents of the University of California. All rights reserved. |
6 | * The Regents of the University of California. All rights reserved. |
7 | * |
7 | * |
8 | * This code is derived from software contributed to Berkeley by |
8 | * This code is derived from software contributed to Berkeley by |
9 | * Chris Torek and Darren F. Provine. |
9 | * Chris Torek and Darren F. Provine. |
10 | * |
10 | * |
11 | * Redistribution and use in source and binary forms, with or without |
11 | * Redistribution and use in source and binary forms, with or without |
12 | * modification, are permitted provided that the following conditions |
12 | * modification, are permitted provided that the following conditions |
13 | * are met: |
13 | * are met: |
14 | * 1. Redistributions of source code must retain the above copyright |
14 | * 1. Redistributions of source code must retain the above copyright |
15 | * notice, this list of conditions and the following disclaimer. |
15 | * notice, this list of conditions and the following disclaimer. |
16 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * 2. Redistributions in binary form must reproduce the above copyright |
17 | * notice, this list of conditions and the following disclaimer in the |
17 | * notice, this list of conditions and the following disclaimer in the |
18 | * documentation and/or other materials provided with the distribution. |
18 | * documentation and/or other materials provided with the distribution. |
19 | * 3. Neither the name of the University nor the names of its contributors |
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 |
20 | * may be used to endorse or promote products derived from this software |
21 | * without specific prior written permission. |
21 | * without specific prior written permission. |
22 | * |
22 | * |
23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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 |
24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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 |
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 |
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 |
32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
33 | * SUCH DAMAGE. |
33 | * SUCH DAMAGE. |
34 | * |
34 | * |
35 | * @(#)input.c 8.1 (Berkeley) 5/31/93 |
35 | * @(#)input.c 8.1 (Berkeley) 5/31/93 |
36 | */ |
36 | */ |
37 | 37 | ||
38 | /** @addtogroup tetris |
38 | /** @addtogroup tetris |
39 | * @{ |
39 | * @{ |
40 | */ |
40 | */ |
41 | /** @file |
41 | /** @file |
42 | */ |
42 | */ |
43 | 43 | ||
44 | /* |
44 | /* |
45 | * Tetris input. |
45 | * Tetris input. |
46 | */ |
46 | */ |
47 | 47 | ||
48 | #include <sys/types.h> |
48 | #include <sys/types.h> |
49 | #include <sys/time.h> |
49 | #include <sys/time.h> |
50 | #include <stdio.h> |
50 | #include <stdio.h> |
51 | 51 | ||
52 | #include <errno.h> |
52 | #include <errno.h> |
53 | #include <unistd.h> |
53 | #include <unistd.h> |
54 | #include <string.h> |
54 | #include <string.h> |
55 | 55 | ||
56 | #include "input.h" |
56 | #include "input.h" |
57 | #include "tetris.h" |
57 | #include "tetris.h" |
58 | 58 | ||
59 | #include <async.h> |
59 | #include <async.h> |
60 | #include <vfs/vfs.h> |
60 | #include <vfs/vfs.h> |
61 | #include <io/console.h> |
61 | #include <io/console.h> |
62 | #include <ipc/console.h> |
62 | #include <ipc/console.h> |
63 | 63 | ||
64 | /* return true iff the given timeval is positive */ |
64 | /* return true iff the given timeval is positive */ |
65 | #define TV_POS(tv) \ |
65 | #define TV_POS(tv) \ |
66 | ((tv)->tv_sec > 0 || ((tv)->tv_sec == 0 && (tv)->tv_usec > 0)) |
66 | ((tv)->tv_sec > 0 || ((tv)->tv_sec == 0 && (tv)->tv_usec > 0)) |
67 | 67 | ||
68 | /* subtract timeval `sub' from `res' */ |
68 | /* subtract timeval `sub' from `res' */ |
69 | #define TV_SUB(res, sub) \ |
69 | #define TV_SUB(res, sub) \ |
70 | (res)->tv_sec -= (sub)->tv_sec; \ |
70 | (res)->tv_sec -= (sub)->tv_sec; \ |
71 | (res)->tv_usec -= (sub)->tv_usec; \ |
71 | (res)->tv_usec -= (sub)->tv_usec; \ |
72 | if ((res)->tv_usec < 0) { \ |
72 | if ((res)->tv_usec < 0) { \ |
73 | (res)->tv_usec += 1000000; \ |
73 | (res)->tv_usec += 1000000; \ |
74 | (res)->tv_sec--; \ |
74 | (res)->tv_sec--; \ |
75 | } |
75 | } |
76 | 76 | ||
77 | /* We will use a hack here - if lastchar is non-zero, it is |
77 | /* We will use a hack here - if lastchar is non-zero, it is |
78 | * the last character read. We will somehow simulate the select |
78 | * the last character read. We will somehow simulate the select |
79 | * semantics. |
79 | * semantics. |
80 | */ |
80 | */ |
81 | static aid_t getchar_inprog = 0; |
81 | static aid_t getchar_inprog = 0; |
82 | static char lastchar = '\0'; |
82 | static char lastchar = '\0'; |
83 | 83 | ||
84 | /* |
84 | /* |
85 | * Do a `read wait': select for reading from stdin, with timeout *tvp. |
85 | * Do a `read wait': select for reading from stdin, with timeout *tvp. |
86 | * On return, modify *tvp to reflect the amount of time spent waiting. |
86 | * On return, modify *tvp to reflect the amount of time spent waiting. |
87 | * It will be positive only if input appeared before the time ran out; |
87 | * It will be positive only if input appeared before the time ran out; |
88 | * otherwise it will be zero or perhaps negative. |
88 | * otherwise it will be zero or perhaps negative. |
89 | * |
89 | * |
90 | * If tvp is nil, wait forever, but return if select is interrupted. |
90 | * If tvp is nil, wait forever, but return if select is interrupted. |
91 | * |
91 | * |
92 | * Return 0 => no input, 1 => can read() from stdin |
92 | * Return 0 => no input, 1 => can read() from stdin |
93 | * |
93 | * |
94 | */ |
94 | */ |
95 | int |
- | |
96 | rwait(struct timeval *tvp) |
95 | int rwait(struct timeval *tvp) |
97 | { |
96 | { |
98 | struct timeval starttv, endtv, *s; |
97 | struct timeval starttv, endtv, *s; |
99 | static ipc_call_t charcall; |
98 | static ipc_call_t charcall; |
100 | ipcarg_t rc; |
99 | ipcarg_t rc; |
101 | 100 | ||
102 | /* |
101 | /* |
103 | * Someday, select() will do this for us. |
102 | * Someday, select() will do this for us. |
104 | * Just in case that day is now, and no one has |
103 | * Just in case that day is now, and no one has |
105 | * changed this, we use a temporary. |
104 | * changed this, we use a temporary. |
106 | */ |
105 | */ |
107 | if (tvp) { |
106 | if (tvp) { |
108 | (void) gettimeofday(&starttv, NULL); |
107 | (void) gettimeofday(&starttv, NULL); |
109 | endtv = *tvp; |
108 | endtv = *tvp; |
110 | s = &endtv; |
109 | s = &endtv; |
111 | } else |
110 | } else |
112 | s = NULL; |
111 | s = NULL; |
113 | 112 | ||
114 | if (!lastchar) { |
113 | if (!lastchar) { |
115 | again: |
114 | again: |
116 | if (!getchar_inprog) { |
115 | if (!getchar_inprog) { |
117 | getchar_inprog = async_send_0(fphone(stdin), |
116 | getchar_inprog = async_send_0(fphone(stdin), |
118 | CONSOLE_GET_EVENT, &charcall); |
117 | CONSOLE_GET_EVENT, &charcall); |
119 | } |
118 | } |
- | 119 | ||
120 | if (!s) |
120 | if (!s) |
121 | async_wait_for(getchar_inprog, &rc); |
121 | async_wait_for(getchar_inprog, &rc); |
122 | else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) { |
122 | else if (async_wait_timeout(getchar_inprog, &rc, s->tv_usec) == ETIMEOUT) { |
123 | tvp->tv_sec = 0; |
123 | tvp->tv_sec = 0; |
124 | tvp->tv_usec = 0; |
124 | tvp->tv_usec = 0; |
125 | return (0); |
125 | return (0); |
126 | } |
126 | } |
- | 127 | ||
127 | getchar_inprog = 0; |
128 | getchar_inprog = 0; |
128 | if (rc) { |
129 | if (rc) |
129 | stop("end of file, help"); |
130 | stop("end of file, help"); |
130 | } |
131 | |
131 | if (IPC_GET_ARG1(charcall) == KEY_RELEASE) |
132 | if (IPC_GET_ARG1(charcall) == KEY_RELEASE) |
132 | goto again; |
133 | goto again; |
133 | 134 | ||
134 | lastchar = IPC_GET_ARG4(charcall); |
135 | lastchar = IPC_GET_ARG4(charcall); |
135 | } |
136 | } |
- | 137 | ||
136 | if (tvp) { |
138 | if (tvp) { |
137 | /* since there is input, we may not have timed out */ |
139 | /* since there is input, we may not have timed out */ |
138 | (void) gettimeofday(&endtv, NULL); |
140 | (void) gettimeofday(&endtv, NULL); |
139 | TV_SUB(&endtv, &starttv); |
141 | TV_SUB(&endtv, &starttv); |
140 | TV_SUB(tvp, &endtv); /* adjust *tvp by elapsed time */ |
142 | TV_SUB(tvp, &endtv); /* adjust *tvp by elapsed time */ |
141 | } |
143 | } |
- | 144 | ||
142 | return (1); |
145 | return 1; |
143 | } |
146 | } |
144 | 147 | ||
145 | /* |
148 | /* |
146 | * `sleep' for the current turn time (using select). |
149 | * `sleep' for the current turn time (using select). |
147 | * Eat any input that might be available. |
150 | * Eat any input that might be available. |
148 | */ |
151 | */ |
149 | void |
- | |
150 | tsleep(void) |
152 | void tsleep(void) |
151 | { |
153 | { |
152 | struct timeval tv; |
154 | struct timeval tv; |
153 | 155 | ||
154 | tv.tv_sec = 0; |
156 | tv.tv_sec = 0; |
155 | tv.tv_usec = fallrate; |
157 | tv.tv_usec = fallrate; |
156 | while (TV_POS(&tv)) |
158 | while (TV_POS(&tv)) |
157 | if (rwait(&tv)) { |
159 | if (rwait(&tv)) { |
158 | lastchar = '\0'; |
160 | lastchar = '\0'; |
159 | } else |
161 | } else |
160 | break; |
162 | break; |
161 | } |
163 | } |
162 | 164 | ||
163 | /* |
165 | /* |
164 | * getchar with timeout. |
166 | * getchar with timeout. |
165 | */ |
167 | */ |
166 | int |
- | |
167 | tgetchar(void) |
168 | int tgetchar(void) |
168 | { |
169 | { |
169 | static struct timeval timeleft; |
170 | static struct timeval timeleft; |
170 | char c; |
171 | char c; |
171 | 172 | ||
172 | /* |
173 | /* |
173 | * Reset timeleft to fallrate whenever it is not positive. |
174 | * Reset timeleft to fallrate whenever it is not positive. |
174 | * In any case, wait to see if there is any input. If so, |
175 | * In any case, wait to see if there is any input. If so, |
175 | * take it, and update timeleft so that the next call to |
176 | * take it, and update timeleft so that the next call to |
176 | * tgetchar() will not wait as long. If there is no input, |
177 | * tgetchar() will not wait as long. If there is no input, |
177 | * make timeleft zero or negative, and return -1. |
178 | * make timeleft zero or negative, and return -1. |
178 | * |
179 | * |
179 | * Most of the hard work is done by rwait(). |
180 | * Most of the hard work is done by rwait(). |
180 | */ |
181 | */ |
181 | if (!TV_POS(&timeleft)) { |
182 | if (!TV_POS(&timeleft)) { |
182 | faster(); /* go faster */ |
183 | faster(); /* go faster */ |
183 | timeleft.tv_sec = 0; |
184 | timeleft.tv_sec = 0; |
184 | timeleft.tv_usec = fallrate; |
185 | timeleft.tv_usec = fallrate; |
185 | } |
186 | } |
- | 187 | ||
186 | if (!rwait(&timeleft)) |
188 | if (!rwait(&timeleft)) |
187 | return (-1); |
189 | return -1; |
- | 190 | ||
188 | c = lastchar; |
191 | c = lastchar; |
189 | lastchar = '\0'; |
192 | lastchar = '\0'; |
190 | return ((int)(unsigned char)c); |
193 | return ((int) (unsigned char) c); |
191 | } |
194 | } |
192 | 195 | ||
193 | /** @} |
196 | /** @} |
194 | */ |
197 | */ |
195 | - | ||
196 | 198 |