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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Josef Cejka |
2 | * Copyright (C) 2006 Josef Cejka |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <key_buffer.h> |
29 | #include <key_buffer.h> |
- | 30 | #include <futex.h> |
|
- | 31 | ||
- | 32 | atomic_t keybuffer_futex = FUTEX_INITIALIZER; |
|
30 | 33 | ||
31 | /** Clear key buffer. |
34 | /** Clear key buffer. |
32 | */ |
35 | */ |
33 | void keybuffer_free(keybuffer_t *keybuffer) |
36 | void keybuffer_free(keybuffer_t *keybuffer) |
34 | { |
37 | { |
35 | - | ||
- | 38 | futex_down(&keybuffer_futex); |
|
- | 39 | keybuffer->head = 0; |
|
- | 40 | keybuffer->tail = 0; |
|
36 | keybuffer->items = 0; |
41 | keybuffer->items = 0; |
37 | keybuffer->head = keybuffer->tail = keybuffer->items = 0; |
42 | futex_up(&keybuffer_futex); |
38 | } |
43 | } |
39 | 44 | ||
40 | /** Key buffer initialization. |
45 | /** Key buffer initialization. |
41 | * |
46 | * |
42 | */ |
47 | */ |
43 | void keybuffer_init(keybuffer_t *keybuffer) |
48 | void keybuffer_init(keybuffer_t *keybuffer) |
44 | { |
49 | { |
45 | keybuffer_free(keybuffer); |
50 | keybuffer_free(keybuffer); |
46 | } |
51 | } |
47 | 52 | ||
48 | /** Get free space in buffer. |
53 | /** Get free space in buffer. |
49 | * This function is useful for processing some scancodes that are translated |
54 | * This function is useful for processing some scancodes that are translated |
50 | * to more than one character. |
55 | * to more than one character. |
51 | * @return empty buffer space |
56 | * @return empty buffer space |
52 | */ |
57 | */ |
53 | int keybuffer_available(keybuffer_t *keybuffer) |
58 | int keybuffer_available(keybuffer_t *keybuffer) |
54 | { |
59 | { |
55 | return KEYBUFFER_SIZE - keybuffer->items; |
60 | return KEYBUFFER_SIZE - keybuffer->items; |
56 | } |
61 | } |
57 | 62 | ||
58 | /** |
63 | /** |
59 | * @return nonzero, if buffer is not empty. |
64 | * @return nonzero, if buffer is not empty. |
60 | */ |
65 | */ |
61 | int keybuffer_empty(keybuffer_t *keybuffer) |
66 | int keybuffer_empty(keybuffer_t *keybuffer) |
62 | { |
67 | { |
63 | return (keybuffer->items == 0); |
68 | return (keybuffer->items == 0); |
64 | } |
69 | } |
65 | 70 | ||
66 | /** Push key to key buffer. |
71 | /** Push key to key buffer. |
67 | * If buffer is full, character is ignored. |
72 | * If buffer is full, character is ignored. |
68 | * @param key code of stored key |
73 | * @param key code of stored key |
69 | */ |
74 | */ |
70 | void keybuffer_push(keybuffer_t *keybuffer, char key) |
75 | void keybuffer_push(keybuffer_t *keybuffer, char key) |
71 | { |
76 | { |
- | 77 | futex_down(&keybuffer_futex); |
|
72 | if (keybuffer->items < KEYBUFFER_SIZE) { |
78 | if (keybuffer->items < KEYBUFFER_SIZE) { |
- | 79 | keybuffer->fifo[keybuffer->tail] = key; |
|
73 | keybuffer->fifo[keybuffer->tail = (keybuffer->tail + 1) < keybuffer->items ? (keybuffer->tail + 1) : 0] = (key); |
80 | keybuffer->tail = (keybuffer->tail + 1) % KEYBUFFER_SIZE; |
74 | keybuffer->items++; |
81 | keybuffer->items++; |
75 | } |
82 | } |
- | 83 | futex_up(&keybuffer_futex); |
|
76 | } |
84 | } |
77 | 85 | ||
78 | /** Pop character from buffer. |
86 | /** Pop character from buffer. |
79 | * @param c pointer to space where to store character from buffer. |
87 | * @param c pointer to space where to store character from buffer. |
80 | * @return zero on empty buffer, nonzero else |
88 | * @return zero on empty buffer, nonzero else |
81 | */ |
89 | */ |
82 | int keybuffer_pop(keybuffer_t *keybuffer, char *c) |
90 | int keybuffer_pop(keybuffer_t *keybuffer, char *c) |
83 | { |
91 | { |
- | 92 | futex_down(&keybuffer_futex); |
|
84 | if (keybuffer->items > 0) { |
93 | if (keybuffer->items > 0) { |
85 | keybuffer->items--; |
94 | keybuffer->items--; |
- | 95 | *c = keybuffer->fifo[keybuffer->head]; |
|
86 | *c = keybuffer->fifo[keybuffer->head = (keybuffer->head + 1) < keybuffer->items ? (keybuffer->head + 1) : 0]; |
96 | keybuffer->head = (keybuffer->head + 1) % KEYBUFFER_SIZE; |
- | 97 | futex_up(&keybuffer_futex); |
|
87 | return 1; |
98 | return 1; |
88 | } |
99 | } |
- | 100 | futex_up(&keybuffer_futex); |
|
89 | return 0; |
101 | return 0; |
90 | } |
102 | } |
91 | 103 | ||
92 | 104 | ||
93 | 105 |